RU2604398C2 - Anvil and cartridge alignment configuration for a circular stapler - Google Patents

Abstract

FIELD: medical equipment.

SUBSTANCE: group of inventions relates generally to circular staplers and, more particularly, to an alignment configuration for aligning an anvil assembly and a staple driver of a circular stapler. Stapling reload assembly for a circular stapling instrument includes a casing, staple holder attached to the casing, staple driver, and an anvil assembly. Staple driver includes a driver alignment surface, at the same time staple driver is receivable within the casing and is configured to move within the casing from a pre-fired position to a fired position. Anvil assembly includes an anvil base surface, an anvil alignment surface, and a staple forming surface, anvil shaft and metal shaft detachably connected to anvil shaft. Anvil alignment surface is configured only on anvil shaft and extends from the top of the anvil shaft to the bottom part of the anvil shaft, anvil base surface is configured to move from an open position away from the casing to a closed position adjacent the casing. anvil alignment surface is configured to mate with the driver alignment surface to rotationally align the staple forming surface with the staple holder, when the anvil base surface is in the closed position. Circular stapling instrument comprising: handle, firing trigger, anvil control member, staple holder attached to the casing. Staple driver disposed within the casing and moveable, when the firing trigger is fired, within the casing from a pre-fired position to a fired position. Anvil base is moveable, using the anvil control member, from an open position away from the casing to a closed position adjacent the casing wherein when the anvil base surface is in the closed position the anvil alignment surface mates with the driver alignment surface and rotationally aligns the staple forming surface with the staple holder.

EFFECT: inventions provide reliable alignment between anvil plate and driver to reduce possible variability.

12 cl, 47 dwg

Description

FIELD OF THE INVENTION

The present invention relates generally to circular stapling tools and, more particularly, to a configuration for centering the thrust assembly and ejector brackets of a circular stapling tool.

BACKGROUND OF THE INVENTION

Circular stapling instruments are well known in surgery and are used for bowel surgery. Examples of such devices include an endoscopic curved intramural stapling instrument Endopath ILS ECS 25 manufactured by Ethicon Endo Surgery Inc. There are many patents for circular stapling tools, for example No. 4207898 Becht, 4351466 Noiles, 5292053 Bilotti et al. and 5344059 Green et al.

To obtain a high-quality stitch seam using a circular stapling tool, the cassette with suture staples and the thrust plate must be properly centered relative to each other. Typically, centering is achieved by aligning the slots of the thrust plate with the grooves on the housing and by centering the ejector brackets in the housing. Thus, by centering the thrust plate and the housing and by centering the ejector brackets in the housing, the thrust plate is centered with respect to the ejector brackets due to two separate centerings with the housing. However, a greater variability of position is possible, since to center the position of the thrust plate with respect to the bracket ejector, it is necessary to center the bracket ejector with respect to the housing and center the thrust plate with respect to the housing.

It is necessary to create a circular stapling tool that provides proper centering between the thrust plate and the ejector brackets without the need to center the thrust plate and the housing and the ejector brackets and the housing to reduce possible variability.

SUMMARY OF THE INVENTION

The present invention is described in the paragraphs of a patent application, and no part of this section should be construed as limiting these points.

In one aspect, a rechargeable cassette unit of a circular stapling tool is provided, comprising a housing, a cassette for staples, a staple ejector, and a thrust assembly. The cassette for the brackets is attached to the housing. The ejector staples has a centering surface. The ejector brackets are made with the possibility of placement inside the housing and move inside the housing from the original to the working position. The thrust assembly comprises a base surface of the thrust plate, a centering surface of the thrust plate, and a surface for forming the brace seam. The base of the thrust plate is movable from an open position away from the housing to a closed position near the housing. The centering surface of the thrust plate is adapted to mate with the centering surface of the ejector brackets and is intended for rotational centering of the surface to form a bracket seam and cassette for brackets when the base surface of the thrust plate is closed.

In another aspect of the invention, the circular stapling tool comprises a handle, a trigger, a thrust plate control member, a housing, a staple cartridge, a staple ejector, and a stop assembly. The cassette for the brackets is attached to the housing. The ejector staples has a centering surface. The ejector brackets are made with the possibility of placement in the housing and moving from the original to the working position when the trigger is activated. The thrust assembly comprises a base surface of the thrust plate, a centering surface of the thrust plate, and a surface for forming the brace seam. The base of the thrust plate is movable by means of the control element of the thrust plate from the open position to the side of the housing to the closed position near the housing. The centering surface of the thrust plate is adapted to mate with the centering surface of the ejector brackets for rotationally centering the surface to form a bracket seam and cassette for the brackets when the base surface of the thrust plate is closed.

In an additional aspect of the invention, a method is provided for centering a rechargeable cassette unit of a circular stapling tool. At one stage, a cassette unit of a circular stapling tool is presented. The cassette unit comprises a housing, a cassette for brackets attached to the housing, a bracket ejector movably placed in the housing, and a thrust plate movably placed relative to the bracket ejector. At another stage, the centering surface of the thrust plate is adapted to mate with the centering surface of the ejector brackets, so that the surface for forming the bracket seam of the thrust plate is rotationally centered with the cassette for the brackets when the base surface of the thrust plate is in the closed position and is adjacent to the housing.

BRIEF DESCRIPTION OF THE DRAWINGS

The following figures and description will help to better understand the invention. The scale of the components in the figures may differ from the real one; the main attention in their preparation was given to illustrate the principles of the invention.

Figure 1 shows a perspective view of a reusable circular stapling stapling tool of an open type according to one of the preferred embodiments of the invention.

FIG. 2 shows a perspective view of a reusable circular stapling tool of FIG. 1 in an open position with a thrust plate separated from the rest of the reusable circular stapling tool.

Figure 3 shows a diagram of the components of the handle and the barrel of the reusable staple stapling tool shown in figure 1.

On figa shows a cross section along the line 3A-3A through a reciprocating drive shaft to adjust the position of the thrust plate reusable circular stapling tool staples.

FIG. 3B shows a cross-section along line 3B-3B through another part of the shaft for adjusting the position of the thrust plate of the reusable circular stapling tool of FIG. 3.

Figure 4 shows a diagram of the components of a rechargeable cassette block circular stapling staple tool depicted in figure 1.

Figure 5 shows a sectional view of a portion of a rechargeable cassette block of a circular stapling staple tool of Figure 1, in a disassembled form.

FIG. 6 shows a rechargeable cassette unit of the circular stapling tool of FIG. 1 in a sectional view, assembled, with a thrust plate in an open position and an annular blade in a position before being flashed.

Fig.7 shows the same system as in Fig.6, but in the closed position, with the annular blade in the position before flashing.

On Fig shows a diagram of the components of the thrust plate reusable stapling staple tool depicted in figure 1.

Figure 9 shows a diagram of one of the embodiments of the invention - a method of centering a rechargeable cassette block circular stapling staple tool.

Figure 10 shows a perspective view of the components of a thrust plate according to another embodiment of the invention.

FIG. 11 is a perspective view of a reusable circular stapling tool of FIG. 1 with a thrust plate shown in FIG. 10 separated from the rest of the reusable circular stapling tool.

12 is a perspective view of the components of a thrust assembly according to another embodiment of the invention.

FIG. 13 is a perspective view of a reusable circular stapling tool of FIG. 1, in which the stop assembly is replaced by the stop plate of FIG. 12, which is separated from the rest of the reusable circular stapling tool.

On Fig shows a diagram of one of the embodiments of the invention is a method of manufacturing a thrust unit.

On figa and 15B shows a perspective view of the components at different stages of the assembly, containing the handle closing the thrust plate and the reciprocating drive shaft for adjusting the position of the thrust plate reusable stapling tool, shown in figure 1.

On figa and 16B shows a perspective view of the handle closing the thrust plate connected to the shaft for adjusting the position of the thrust plate shown in figa and 15B, with the handle of the reusable circular stapling stapled tool shown in figure 1, at different stages of Assembly .

On figa, 17B and 17C shows a perspective view of the handle closing the thrust plate connected to the shaft to adjust the position of the thrust plate, and the handle depicted in figa and 16B, as well as the rod reusable circular stapling stapled tool depicted in fig. 1, at different stages of assembly.

On figa and 18B shows a perspective view of the handle closing the thrust plate connected to the reciprocating drive shaft, the handle and the rod shown in figa and 17B and 17C, reusable circular stapling stapled tool depicted in figure 1, different stages of assembly.

On figa, 19B and 19C shows a perspective view of the handle closing the thrust plate connected to the shaft to adjust the position of the thrust plate, handle and rod, as well as the handle cover shown in figa and 18B, as well as the barrel reusable circular stapling staples the tool depicted in figure 1, at different stages of assembly.

On Fig shows a perspective view of a curved reusable circular stapling staple tool open type according to another preferred variant embodiment of the invention.

On Fig shows a perspective view of parts of a curved reusable stapling staple tool depicted in Fig.20.

On Fig shows a curved circular stapling staple tool with a device to reduce friction, in the open position, in section.

On Fig shows a curved circular stapling staple tool with a device to reduce friction, in the closed position before flashing, in section.

On Fig shows a curved circular stapling staple tool with a device to reduce friction, in the position for flashing, in section.

On Fig shows a perspective view of the rod of a curved circular stapling staple tool device to reduce friction.

On Fig shows a perspective view of parts of the rod of a curved circular stapling staple tool with a device to reduce friction.

On Fig shows a perspective view of the rod of a curved circular stapling staple tool with a device to reduce friction in the section.

On Fig shows an enlarged view of the stem of a circular stapling tool with another embodiment of a device to reduce friction adjacent to the reciprocating drive shaft to adjust the position of the thrust plate.

On Fig shows the annular blade of the rechargeable cassette block circular stapling stapled tool depicted in figure 4, in section.

On Fig shows a perspective view of an annular split washer connected to a protective device.

On Fig shows the tool depicted in Fig.7, with an annular blade, moved to the position for the cut and included in the split washer in the closed position of the surface of the base of the thrust plate.

On Fig shows an enlarged view, the dashed line shows the annular blade shown in Fig, while the annular blade enters the split washer and cuts off the round fragment.

On Fig shows the detail shown in Fig, while the thrust plate is moved back to the open position after actuating the annular blade.

On figa shows an enlarged side view of one of the embodiments of the control element of the thrust plate connected to the handle of a reusable circular stapling tool.

On Fig shows the detail shown in Fig, with removed from the circular stapling tool staples thrust plate and with a split ring washer and a protective element attached to the annular blade.

On Fig shows the detail shown in Fig, when trying to connect a new thrust plate with a cassette unit, when the protective element and the annular split washer prevent attachment.

On Fig shows an enlarged view of the area bounded by a discontinuous circle in Fig, which shows a protective element and an annular split washer, preventing the connection of a new thrust plate to the rechargeable cassette unit.

On Fig shows a diagram of one of the embodiments of the invention is a method of fixing the blade to the split washer circular stapling tool staples.

On Fig shows a circular stapling staple tool depicted in figure 1, in section, with a thrust plate in the open position, outside the flashing zone, away from the housing, with the trigger in a locked position before actuation.

On figv shows an enlarged view of the relationship between the trigger and the rod in the assembled state, shown in figs.

On Fig shows a perspective view of part of the brackets of the tool shown in Fig, in section.

On Fig shows a view in cross section along line 40-40 of Fig.38.

Fig. 41 shows a reusable circular stapling tool shown in Fig. 1 in section, with a stop plate in the closed position, located in the flashing zone (near the housing), with the trigger in the unlocked state, ready to be pressed for flashing.

On Fig shows a perspective view of part of the brackets of the tool shown in Fig, in section.

Fig. 43 is a cross-sectional view taken along line 43-43 of Fig. 41.

On Fig shows a reusable circular stapling tool staples, depicted in figure 1, in section, with a thrust plate in the closed position, in the flashing zone (near the housing), with the trigger mechanism actuated.

On Fig shows a perspective view of part of the brackets of the tool shown in Fig, in section.

Fig. 46 is a cross-sectional view taken along line 46-46 of Fig. 44.

On figa and 47B shows a view of a cassette unit attached to the handle, in section, with a thrust plate in the open and closed state, respectively.

DETAILED DESCRIPTION OF THE INVENTION

Figure 1 shows a new surgical circular stapling staple instrument 100, designed to excise tissue of a patient (person) in accordance with the present invention. Surgical circular stapling staple instrument 100 can be used to excise tissues, including internal hemorrhoids, or other types of human tissue. The circular stapling tool 100 is designed based on the traditional circular stapling tool, described in US patent No. 6102271, the contents of which are incorporated herein by reference in their entirety. The circular stapling staple instrument 100 has a rechargeable cassette unit 102 for applying a circular suture from a series of surgical suture staples 104 (see FIGS. 7 and 31) to the mucous layer at the base of the internal hemorrhoid, as well as to cut off the mucous tissue along with hemorrhoidal node from the side of the inner wall of the rectum or anus. In general, the circular staple-stapling instrument 100 can be used to form an anastomosis of two sections of the intestine by applying a circular suture from surgical staples 104 (see FIGS. 7 and 31) and excising a circular fragment bounded by a circular staple suture to pass the feces.

1 to 2, a circular stapling staple instrument 100 comprises an ergonomic barrel 106, a cassette with surgical staples 108 having a housing 110, and an abutment assembly 112 detachably connected to a reciprocating drive shaft 114 to adjust the position of the abutment plate. The rechargeable cassette unit 102 of the circular stapling tool comprises a cassette with suture staples 108 and a stop plate 112. As shown in FIGS. 1-3, the circular stapling tool 100 also includes a handle 116 having a cavity 118. The control of the stop plate 120 is located at the proximal the end of the handle 116 and connected to the system of the thrust plate 112 so that the rotation of the control element 120 moves the thrust plate in the proximal or distal direction, depending on the direction of rotation of the element systematic way 120. The control knob 120 may comprise closing the swashplate or other type swashplate control. The circular stapling tool 100 includes a trigger 122 that pivots in a direction 124 from an open position (shown in the figure) to a closed position where suture staples 104 (see FIGS. 7 and 31) are inserted into the fabric (see FIG. 31) and excess tissue is cut off with an annular blade 126 (see FIG. 31) of the rechargeable cartridge unit 102. The safety latch 128 is located on the trigger 122 and is shown in the upper and latched position blocking the trigger release. When the safety latch 128 is not latched, that is, shifted inwardly and downwardly 128a, the release mechanism 122 freely rotates in the direction 124 from the open position to the closed. The barrel 106 extends distally from the handle 116 and is detachably connected to the handle 116 at the proximal end with a connecting nut 130 that is screwed onto the threaded portion 132 (see FIG. 3) of the handle 116. Opposite connecting elements 134 (see FIG. 4) of the housing 110 are detachably connected to respective engaging elements 136 (see FIG. 3) at the distal end of the barrel 106. Connection 134 comprises connecting elements with deflection locking protrusions and engaging elements 136 with openings. In other embodiments of the invention, the connecting elements 134 and the engaging elements 136 may contain any type of matching parts.

As shown in FIG. 2, the casing 110 has an outer surface 138 with an expanded guide portion 140 and an outer tubular guide portion 142. Channels 144 include holes in the surface of the casing extending from the expanded guide portion 140 to the outer tubular guide portion 142. An annular cassette for suture staples 148 (see Figs. 4-5, 7 and 31) are attached to the distal end of the housing 110, while the connecting elements 150 (see Figs. 4, 7 and 31) of the cassette for suture staples 148 are detachably connected to the engaging elements 152 ( see FIGS. 4, 7 and 31) of the housing 110. Connecting elements You 150 have protrusions, and the engaging elements 152 are deflection locking elements. In other embodiments, attachable couplers 150 and engagement members 152 may include any type of coupler. The annular cassette for suture staples 148 includes a series of grooves for staples 154 (see FIGS. 4, 7 and 31) and is configured to hold and release suture staples 104 (see FIG. 31).

As shown in FIGS. 4-7, the ejector brackets 156 forms a sliding connection with an annular cassette for suture brackets 148 with keys 158 (see FIG. 4) of the ejector brackets 156, creating a detachable connection with the locking grooves 160 (see FIG. 4) the ring holder of the brackets 148. The pusher of the brackets 156 is movably connected to the housing 110 using the centering grooves 162 of the annular outer guide surface 164 of the ejector brackets 156, which is movably connected to the centering slots 166 of the annular inner surface of the housing 110 with the possibility of moving the ejector the brackets 156 inside the housing 110, but the inability to rotate the ejector brackets 156 in the housing 110. The outer guide surface 164 of the ejector brackets 156 has an extended guide part 170 and an outer tubular guide part 171. Centering grooves 162 and centering slots 166 are parallel to the longitudinal axis 172 and 174 of the ejector brackets 156 and housing 110. In other embodiments of the invention, the housing 110 and the ejector brackets 156 can be oriented relative to each other using centering parts of any type, configuration and foliage, with the possibility of longitudinal movement.

The staple ejector 156 has a plurality of protrusions 176 that fit into the grooves of the staple cassette 148 in which the suture braces are located. The protrusions 176 serve to engage and guide the movement of multiple suture staples 104 (see Fig. 31) from the grooves for the staples 154 of the cassette for the staples 148, while the ejector staples 156 is moved from its original position until the trigger is pressed (see Fig. 7) working position after pressing the trigger mechanism 122 (see Fig.3) (see Fig.31). As shown in Figs. 4 and 7, the flexible locking element 178 of the ejector brackets 156 is detachably connected to the locking protrusions 180 of the housing 110. Due to this arrangement, the ejector of the brackets 156 moves longitudinally only when a certain force is applied to the stem 282 (see Figs. 44-46 ) and its effect on the ejector brackets 156. When the required force is applied, the flexible locking elements 178 on the ejector brackets 156 bend inward and move away from the locking protrusions 180 on the housing 110, which allows the ejector brackets 156 to move in the longitudinal and distal flax direction. In other embodiments, the flexible locking member 178 and locking protrusions 180 may comprise other types of related parts.

An annular blade 126 is fixed to the distal end of the ejector brackets 156 and connected to a plurality of pins for securing the blade 182 (see FIGS. 5 and 31) included in the same number of holes 184 in the base 186 of the ring blade 126. The ring blade 126 has an opening 188 ( see FIGS. 5 and 31) at the base 186. The open distal end 190 (see FIGS. 4, 29 and 31) of the annular blade 126 has a cutting edge 192. The annular blade 126 moves with the ejector suture staples 156 when the ejector staples 156 displaced distally from the starting position (Fig.7) to the working position (Fig. 31) by pressing the trigger 122 (see Fig. 3). When the trigger mechanism 122 is activated, the latter rotates in the direction 124 from the position shown in Figs. 38-43 to the position shown in Figs. 44-46, which causes the associated stem 282 to move in the housing 110 in the direction 329 and abut into the ejector brackets 156, which also moves inside the housing 110 in the direction 392. This movement leads to the movement of the ejector brackets 156 and the annular blade 126 connected to it from the position shown in FIGS. 7 and 38-43 to the position shown in FIG. 31 and 44-46. During the movement of the ejector brackets 156, the protrusions 176 of the ejector brackets 156 move the brackets 104 from the initial position in the bracket cassette 148 shown in FIG. 7 to the working position, that is, the brackets are pushed out of the bracket cassette 148, as shown in FIG. 31.

A reciprocating drive shaft 114 for adjusting the position of the thrust plate (see FIGS. 4 and 6) is located inside the cassette with brackets 108 and is positioned so as to move inside the inner round barrel 194 (see FIGS. 4 and 6) of the ejector brackets 156 As shown in FIGS. 3A and 3B, the cross section of the shaft 114 for adjusting the position of the thrust plate varies in shape and size: one part along the line 3A-3A is circular in cross section, and the second part along the line 3B-3B has parallel side walls with a distance of 402 between them, which is less than meter 401, as shown in Figure 3B. As shown in FIG. 4, the inner barrel 194 extends in a longitudinal direction inside the ejector brackets 156 parallel to the longitudinal axis 172 of the ejector brackets 156. A hole 196 is located inside the barrel 194. The surface for centering the thrust plate 198 extends in the longitudinal direction along the annular inner surface 200 of the annular inner barrel 194. The centering surface 198 has at least one longitudinal groove. In other embodiments, the centering surface for the thrust plate 198 may comprise any number or type of surfaces for alignment in various configurations. The inner surface 204 of the barrel 194 is separated from the other inner surface 206 of the ejector staples 156 with a circular hole 208 located between the outer surface 204 of the inner barrel 194 and the circular inner surface 206.

In figures 1, 2, 4-7 and, in particular, 8, the thrust plate system 112 comprises a thrust plate 210, a surface for forming a stitch weld 212, an annular split washer 214, and a metal shaft 216. The thrust plate 210 is an integral cast part of polymer containing a shaft of the thrust plate 218, forming a single unit with the base of the thrust plate 220. The thrust plate 210 is made of a polymer comprising nylon filled with glass or carbon fiber. In other embodiments, the thrust plate 210 may be made of similar composite materials with tensile strengths greater than 103.4 MPa (15,000 psi) to avoid excessive bending when abutting against fabric.

The base of the stop plate 220 is cast together with the surface to form the stitch weld 212 and the metal shaft 216. In other embodiments, the base of the stop plate 220 can be attached to the surface to form the stitch weld 212 using various fixing mechanisms. The surface for forming the stitch weld 212 is made of sheet metal or a plate consisting of stainless steel, has an annular shape and has recesses in which the brackets are inserted. In other embodiments, the surface for forming the stitch weld 212 may be made of aluminum or other materials capable of withstanding the forces arising from the application of suture staples.

An annular split washer 214 is pressed into the cavity 222 of the base of the abutment plate 220 and abuts against the surface of the abutment plate 220. In other embodiments, the annular split washer 214 can be connected to the base of the abutment plate 220 in the cavity 222 using various fixing mechanisms. The split ring washer 214 is made of plastic including ABS (acrylonitrile butadiene styrene). In other embodiments, the annular split washer 214 may be made of nylon, polyethylene, or polypropylene.

The shaft of the thrust plate 218 is cast around the outer surface 224 of the end 226 of the metal shaft 216, while the metal shaft 216 is adapted to enter the shaft hole 228 of the thrust plate 218. The cast hole 228 of the shaft of the thrust plate 218 ends inside the shaft of the thrust plate 218 and does not extend through the distal the end of the base of the thrust plate 220. The inner surface 230 of the shaft of the thrust plate 218 contains engaging elements 232 compressed with the connecting elements 234 of the outer surface 224 of the end 226 of the metal shaft 216. Hook the flying elements 232 contain cast annular ribs (Fig. 38), and the connecting elements 234 - annular grooves (Fig. 8). In other embodiments of the invention, the engaging elements 232 and the connecting elements 234 may include grooves and threads, engaging or connecting elements, or other types of coupling mechanisms. In yet another embodiment, the shaft of the thrust plate 218 may be coupled to the metal shaft 216 using various coupling mechanisms. Channel 236 at the proximal end passes through a metal shaft 216. The end 238 of the metal shaft 216 contains slots for expansion 240 (see FIG. 2). The metal shaft 216 is made of stainless steel. In other embodiments, the metal shaft 216 may be made of various materials.

By the time of production of the thrust plate system 112, the metal shaft 216 and the surface of the formation of the stitch weld 212 have already been manufactured. The finished metal shaft 216 and the finished surface for forming the stitch weld 212 are inserted into the injection mold. The casting mold is then used to cast the thrust plate 210, so that the thrust plate 210 is cast together with the finished metal shaft 216 and the finished surface to form the stitch weld 212. During the injection molding process, the base of the thrust plate 220 is formed, which is pressed together a finished surface for forming a stitch weld 212, at the same time a thrust plate 218 is formed, which is pressed around the end 226 of the finished metal shaft 216. Then, an annular split washer 214 vp essovyvaetsya cavity 222 in the molded base swashplate 220. In still other embodiments, the manufacturing process may vary.

The connecting elements 244 (see FIGS. 2 and 6) of the reciprocating drive shaft for adjusting the position of the thrust plate are detachably connected to the channel at the proximal end 236 of the metal shaft 216 using a snap connection. Such a mechanism operatively connects the metal shaft 216 and the thrust plate 210 attached thereto to the control element of the thrust plate 120 of the shaft 114 to adjust the position of the thrust plate. In other embodiments of the invention, the connecting elements 244 of the reciprocating drive shaft 114 for adjusting the position of the thrust plate can be attached to the metal shaft 216 using other attachment mechanisms. Slots for expansion 240 allow the end 238 of the metal shaft 216 to be pulled out while connected to the connecting elements 244 of the shaft 114 to adjust the position of the thrust plate. After using the staple circular stapling tool 100 for suturing the patient, the entire thrust block 112 is discarded. For subsequent use, a new cartridge unit 102 is taken containing a new thrust unit 112.

As shown in FIG. 8, the shaft of the thrust plate 218 comprises a centering surface 246 that is formed during casting of the thrust plate 210. The centering surface 246 comprises at least one spline parallel to the longitudinal axis 248 of the shaft of the thrust plate 218. The centering surface 246 extends from the top 250 of the shaft of the thrust plate 218 along the outer convex surface 252 of the shaft of the thrust plate 218 to the bottom 254 of the shaft of the thrust plate 218. The metal shaft 216 of the system of the thrust plate 112 does not have a centering surface. In other embodiments, the centering surface of the thrust plate 246 may comprise any number or type of centering surfaces in various configurations. For example, as shown in FIG. 12, in an embodiment of the invention in which the thrust plate system 112 comprises only the thrust plate shaft 218 without a metal shaft 216 connected to the thrust plate system 112, the centering surface 246 may start from the upper portion 250 of the thrust plate shaft 218, extend along the outer convex surface 252 of the shaft of the thrust plate 218 and reach the middle portion 256 of the shaft of the thrust plate 218, not reaching the bottom portion 254 of the shaft of the thrust plate 218.

The stop assembly 112 is movable from an open position (see FIG. 6), in which the surface of the formation of the staple seam 212 is separated from the housing 110 in order to grip the fabric, in the closed position (see FIG. 7), in which the surface of the formation of the staple the seam 212 is adjacent to the housing 110 of the cassette unit 108, clamping the fabric between the staple cassette 148 and the surface of the formation of the staple seam 212 before triggering the trigger for suturing and cutting off excess captured tissue. This is because the tip 242 (see FIGS. 2 and 6) of the connecting elements 244 of the reciprocating drive shaft 114 for adjusting the position of the thrust plate is located inside the inner shaft 194 of the ejector staples 156 and connected to the channel 236 at the proximal end 238 of the metal shaft 216 thrust plate systems 112. As a result, when the connected shaft 114 is moved to adjust the position of the thrust plate, the shaft of the thrust plate 218 connected to the metal shaft 216 is movably located in the cavity of the ejector shaft 194 of the staples 156 with the possibility of moving the surface of the formation of the stitch weld 212 of the system of the thrust plate 112 relative to the ejector brackets 156 and the housing 110.

The centering surface 246 (see FIG. 8) of the shaft of the thrust plate 218 is adapted to mate with the centering surface of the thrust plate 198 (see FIG. 4) of the bracket ejector 156 for rotationally centering the surface of the formation of the bracket joint 212 with the cassette for the brackets 148 when the base the thrust plate 220 is in the closed position (see Fig.7) and is adjacent to the cassette block 108. First, as shown in Fig.6, as the shaft 114 to adjust the position of the thrust plate moves the metal shaft 216 and the shaft connected to it persistent plate 218 and, therefore, moves the base of the thrust plate 220 from the open position shown in Fig.6, in the closed position shown in Fig.7, the centering surface 246 (see Fig. 8) of the shaft of the thrust plate 218 is made without interfacing with the centering surface of the thrust plate 198 (see figure 4) of the inner round shaft 194 of the ejector brackets 165, since the centering surface 198 is located on the metal shaft 216, devoid of a centering surface. At this time, the forming surface of the stitch weld 212 is not centered with the cassette for the brackets 148. However, as shown in FIG. 7, when the centering surface 246 of the shaft of the thrust plate 218 passes through the inner shaft 194 of the ejector bracket 156, the centering surface 246 is aligned with the centering surface of the thrust the plate 198 of the inner shaft 194, which leads to rotational centering of the surface of the formation of the brace seam 212 and the cartridge for the brackets 148, since the base of the thrust plate 220 is moved to the closed position adjacent to the set with brackets 108. In FIG. 33A, marks 120A in the control plate of the thrust plate 120 visually indicate the size of the gap between the surface of the formation of the brace seam 212 of the thrust plate 112 (see FIG. 7) and the ejector brackets 148 (see FIG. 7), which gives the user information about the thickness of the clamped tissue. When the device is in an almost closed position, the proximal end of the shaft 114 for adjusting the position of the thrust plate protrudes through the hole 120F of the control element of the thrust plate 120.

When the thrust plate system 112 is in the closed position, as shown in FIG. 7, and the trigger mechanism of the circular stapling tool 100 is actuated by moving the ejector brackets 156 in the housing 110 from the initial position shown in FIG. 7 to the flashing position shown in Fig. 31, the protrusions 176 of the ejector brackets 156 push the brackets 104 out of the grooves for the brackets 154 of the cassette for the brackets 148 opposite the surface of the formation of the bracket weld 212 of the thrust plate 112. When interacting with the surface of the formation of the bracket Islands 212 released from the bracket slots 104 are formed, forming a closed shape, thus stapled tissue. At the same time, the staple ejector 156 moves the annular blade 126 to the clamped fabric trapped between the forming surface of the staple seam 212 on the abutment plate 210 and the surface of the ejector stapler 148, cutting off the tissue at the split washer 214 of the abutment plate system 112.

Figure 9 shows a diagram 258 of one embodiment of the invention, a method for centering a cassette unit of a circular stapling tool. At 260, a cassette unit of a circular stapling tool is presented. The circular staple-stapling tool presented comprises a housing, a cassette for the clips attached to the housing, a bracket ejector, an annular blade and a thrust plate. At step 262, the staple ejector is movably fixed in the housing in a centered position, and the staple ejector connecting elements are connected to the corresponding casing connecting elements, which prevents the staple ejector from moving until a certain force is applied to the rod. At step 264, the surface of the base of the thrust plate is moved from an open position away from the housing, in which the surface for forming the staple seam is not centered with the cassette for brackets attached to the housing to a closed position near the housing. At step 266, the centering surface of the thrust plate is adapted to mate with the centering surface of the ejector brackets, so that the surface for forming the bracket seam of the thrust plate is rotationally centered with the cassette for the brackets when the surface of the base of the thrust plate is in the closed position and is adjacent to the housing. The centering surface of the thrust plate contains at least one slot, and the centering surface for the thrust plate of the ejector brackets contains at least one slot. In other embodiments, the type, number and configuration of the centering surfaces of the thrust plate and the ejector brackets may vary.

One or more embodiments of the invention can reduce one or more problems associated with centering in previous models of surgical circular stapling instruments. For example, the use of one or more embodiments of the invention can provide proper direct centering of the thrust plate and the ejector brackets instead of centering the thrust plate and the housing, and then the ejector brackets and the housing, as in the tools currently used by the brackets. This method of direct centering of the ejector and the thrust plate reduces the risk of changes in their mutual orientation and helps to improve the shape of the staples.

10 is a diagram of parts of a thrust assembly 112A in yet another embodiment of the invention comprising a thrust plate 210A, a surface for forming a stitch weld 212A, and an annular split washer 214A, as well as a metal shaft 216A. The thrust plate 210A is an integral polymer molded part comprising a shaft of the thrust plate 218A cast along with the base of the thrust plate 220A. In other embodiments, the implementation of the thrust plate 210A may be made of a polymer including nylon filled with glass or carbon fiber. In other embodiments, the thrust plate 210A may be made of similar composite materials with a tensile strength of more than 103.4 MPa (15,000 psi) to avoid excessive bending when abutting against fabric.

The metal shaft 216A passes through the cast hole 228A, which reaches the shaft of the thrust plate 218A and the base of the thrust plate. One end of the metal shaft 216A exits the cast hole 228A and abuts against the upper portion 268 of the base surface of the thrust plate 220A. The end 226A of the metal shaft 216A has a larger diameter 270 than the diameter 272 of the cast hole 228A. The other end 238A of the metal shaft 216A protrudes from the cast hole 228A of the shaft of the thrust plate 218A. The metal shaft 216A contains connecting elements (not visible) that are fastened to the connecting elements (not visible) of the shaft of the thrust plate 218A. The connecting elements are threaded, and the engaging elements are grooves. In other embodiments, the connecting and engaging elements may include connecting and engaging elements or other types of coupling mechanisms. In other embodiments, the metal shaft 216A may be coupled to the shaft of the thrust plate 218A using various locking mechanisms. Channel 286A extends from the proximal end 238A of the metal shaft 216A. The end of the metal shaft 216A also contains slots for expansion 240A. The metal shaft 216A is made of metal including hardened stainless steel. In other embodiments, the implementation of the metal shaft 216A may be made of other types of steel.

The base of the thrust plate 220A is cast along with the surface of formation of the stitch weld 212A. In other embodiments, the base of the abutment plate 220A may be attached to the surface of the formation of the stitch weld 212A using various fixing mechanisms. The surface of the formation of the stitch weld 212A is made of sheet metal or a plate consisting of stainless steel, has an annular shape and contains recesses for suture staples. In other embodiments, the surface of the formation of the stitch weld 212A may be made of other metals, stainless steel, aluminum, in the form of sheets or plates.

An annular split washer 214A is pressed into the cavity 222A of the base of the thrust plate 220A adjacent to the surface of the base of the thrust plate 220A. In other embodiments, the annular split washer 214A may be secured to the cavity 222A of the base of the thrust plate 220A using various locking mechanisms. The 214A ring washer is made of plastic, including ABS (acrylonitrile butadiene styrene). In other embodiments, the implementation of the annular split washer 214A may be made of nylon, polyethylene or polypropylene.

By the time the stop assembly 112A has been manufactured, the surface for forming the staple joint is ready. The surface of the formation of the stitch weld 212A is placed in the mold for injection molding. A casting mold is used to cast the thrust plate 210A, thus, the thrust plate 210A is connected to the surface of the formation of the stitch weld 212A. In the casting process, a base 220A is formed, which is cast along with the surface of formation of the stitch weld 212A. Then, the annular split washer 214A is pressed into the cavity 222A of the cast base of the thrust plate 220A. After casting the base of the thrust plate 220A, the end of the preformed metal shaft 216A extends into the cast hole 228A of the base of the thrust plate 220A and protrudes from the cast hole 228A in the shaft of the thrust plate 218A, thus the end 226A of the metal shaft 216A abuts against the upper portion 268 of the base of the thrust plate 220A . This action can be performed by the user before use. The metal shaft 216A is detachably connected to the shaft of the thrust plate 218A using the connecting elements (not visible) of the shaft of the thrust plate 216A, while the end 238A of the finished metal shaft 216A is inserted into and protrudes from the cast hole 228A of the thrust plate 210A. In other embodiments, the manufacturing process may vary.

As shown in FIG. 11, the connecting members 244 of the shaft 114 for adjusting the position of the thrust plate are detachably connected to the channel 236A at the proximal end of the metal shaft 216A using a snap connection, operatively connecting the metal shaft 216A and the thrust plate 210A to the control element of the thrust plate 120 through the return - translational drive shaft 114 for adjusting the position of the thrust plate. In other embodiments of the invention, the connecting elements 244 of the shaft 114 to adjust the position of the thrust plate can be attached to the metal shaft 216A using other fixing mechanisms. The expansion slots 240A allow the end 238A of the metal shaft 216A to be pulled out to elongate it while connecting the connecting members 244 of the shaft 114 to adjust the position of the thrust plate. After using the staple circular stapling tool 100 to the patient, the metal shaft 216A can be removed from the thrust plate 210A by disconnecting the connecting elements (not visible) of the metal shaft 216A from the engaging elements (not visible) of the metal shaft 218A, the thrust plate 210A can be disposed of, the metal shaft 216A can be sterilized and metal shaft 216A can be connected to a new thrust plate using the process described above, so that metal shaft 216A can be reused for application seams to another patient in combination with a new thrust plate and a new cassette with staples.

As shown in FIGS. 10-11, the shaft of the thrust plate 210A comprises a centering surface 246A formed by casting the thrust plate 210A in the mold. The centering surface 246A comprises at least one slot parallel to the longitudinal axis 248 of the shaft of the thrust plate 218A. The centering surface 246A extends from the upper shaft portion 250A of the thrust plate 218A along the outer tubular shaft surface 252A of the thrust plate 218A to the lower shaft portion 254A of the thrust plate 218A. The metal shaft 216A of the thrust plate 112A does not contain a centering surface. In other embodiments, the centering surface 246A may comprise any number or type of centering surfaces in various configurations.

12 is a diagram of parts of a thrust plate 112A according to yet another embodiment of the invention, comprising a thrust plate 210B, a surface for forming a stitch weld 212B, and an annular washer 214B. The thrust plate 210B is an integral polymer molded portion comprising a shaft of the thrust plate 218B cast along with the base of the thrust plate 220B. The thrust plate 210B is made of a polymer including nylon filled with glass or carbon fiber. In other embodiments, the thrust plate 210B may be made of similar composite materials with tensile strengths greater than 103.4 MPa (15,000 psi) to avoid excessive bending when abutted against fabric. A channel at the proximal end 236B extends inside the shaft of the thrust plate 218B. The shaft of the thrust plate 218B includes slots for expansion 240B.

The base of the thrust plate 220B is cast along with the surface of the formation of the stitch weld 212B. In other embodiments, the base surface of the abutment plate 220B may be attached to the surface of the formation of the brace seam 212B using various attachment mechanisms. The surface of the formation of the stitch weld 212B is made of metal, including austenitic stainless steel, has an annular shape and contains recesses for staples. In other embodiments of the invention, the surface of the formation of the stitch weld 212B may be made of other metals, stainless steel, aluminum, in the form of sheets or plates.

An annular split washer 214B is pressed into the cavity 222B of the base of the thrust plate 220B and abuts against the surface of the base of the thrust plate 220B. In other embodiments, the annular split washer 214B may be located in the cavity 222B of the base of the thrust plate 220B due to various locking mechanisms. The 214B ring washer is made of plastic, including ABS (acrylonitrile butadiene styrene). In other embodiments, the annular split washer 214B may be made of various materials.

By the time the thrust plate 112B was manufactured, the surface for forming the staple joint 212B had already been made. Then, the surface of the formation of the stitch weld 212B is placed in the mold for injection molding. A casting mold is used to cast the thrust plate 210B, so that the thrust plate 210B is connected to the forming surface of the bracket weld 212B. During casting, the base of the thrust plate 220B is formed, which merges with the surface of the formation of the stitch weld 212B. At the same time, the shaft of the thrust plate 218B, including the shaft attachment portion for adjusting the position of the thrust plate, is placed in the mold for casting the base of the thrust plate 220B and becomes a part thereof. Then, the annular split washer 214B is pressed into the cavity 222B of the molded base of the thrust plate 220B. In other embodiments, the manufacturing process may vary.

As shown in FIG. 13, the connecting elements 244 of the shaft 114 for adjusting the position of the thrust plate are detachably connected to the channel at the proximal end 236B of the shaft of the thrust plate 218B by means of a snap connection operatively connecting the shaft 218B of the thrust plate 210B to the control element of the thrust plate 120 through the return translational drive shaft 114 for adjusting the position of the thrust plate. In other embodiments of the invention, the connecting elements 244 of the shaft 114 for adjusting the position of the thrust plate may be attached to the shaft of the thrust plate 218B using other fixing mechanisms. Expansion slots 240B allow the shaft of the thrust plate 218B to be pulled out while connected to the connecting elements 244 of the shaft 114 to adjust the position of the thrust plate. After using the patient’s circular stapling tool 100 to stitch the patient, the stop plate 210B can be disposed of and a new stop plate installed on the circular stapling tool 100 to carry out another procedure with another patient.

As shown in FIGS. 12-13, the shaft of the thrust plate 218B includes a centering surface 246B formed during casting of the thrust plate 210B. The centering surface 246B comprises at least one slot parallel to the longitudinal axis 248 of the shaft of the thrust plate 218B. The centering surface 246B extends from the upper shaft portion 250B of the thrust plate 218B along the outer convex shaft surface 252B of the thrust plate 218B to the middle shaft portion 256B of the thrust plate 218A and does not extend through the lower shaft portion 254B of the thrust plate 218A. In other embodiments, the centering surface 246B may comprise any number or type of centering surfaces in various configurations.

On Fig shows a diagram 274 of one of the embodiments of the invention - a method of manufacturing a thrust unit. At step 276, an already-made surface for forming a stitch weld, which may be made of metal or other material, is placed in a mold. At step 278, a thrust assembly is obtained by casting the thrust plate together with the finished surface to form a stitch weld in a mold, resulting in a thrust plate with a shaft starting from the base of the thrust plate. The thrust plate can be molded as an integral part of a polymer, for example, nylon filled with glass or carbon fiber. In other embodiments, the thrust plate may be cast from other materials. In one embodiment, step 278 may further include casting a thrust plate with at least one centering surface comprising a slot or other type of centering surface. In another embodiment, step 278 may further include casting the thrust assembly in such a way that the thrust plate shaft is integral with the finished shaft, which may be made of metal and other materials placed in the casting mold in step 276. In a further embodiment of the invention at a subsequent stage, the finished shaft, which can be made of metal or other materials, can be attached to the shaft of the thrust plate after casting the latter. At 280, a split washer is attached to the base of the thrust plate by pressing or other attachment mechanisms. The washer may have a ring or other shape, may be made of plastic, including ABS (acrylonitrile butadiene styrene) or other types of materials. In other embodiments, one or more steps of the method may vary.

One or more embodiments of the invention can reduce one or more problems associated with the use of previous models of thrust plates. For example, the use of one or more embodiments of the invention involves the use of a thrust plate, the production of which is one third cheaper than the production of the thrust plates currently in use.

1-3, the circular stapling tool 100 comprises a handle 116, a reciprocating drive shaft 114 for adjusting the position of the thrust plate, a rod 282, a handle cover 284, a barrel 106 detachably connected to the handle 116, a cassette with brackets 108 and a thrust plate system 112, which is releasably connected to a reciprocating drive shaft 114 for adjusting the position of the thrust plate. The handle 116 forms a cavity 118, which includes the rod 282 and the reciprocating drive shaft 114 to adjust the position of the thrust plate. The reciprocating drive shaft 114 for adjusting the position of the thrust plate has connecting elements 244 at the end 242 of the shaft 114 for adjusting the position of the thrust plate and a threaded connecting part 286 that is detachably connected to the control element of the thrust plate 120 at the proximal end of the shaft 114 for adjusting the position of the thrust plate .

The rod 282 is used to stabilize and securely mount the reciprocating drive shaft 114 to adjust the position of the thrust plate in the handle 116. The rod 282 has a pair of grooves 288 and 290 and connecting elements 292 at the distal end. Preferably, the connecting grooves 288 and 290 are located on opposite sides of the stem 282. The trigger mechanism 122 includes an upper end 294 that fits into the grooves 288 and 290 and detachably secures the stem 282 and shaft 114 to adjust the position of the thrust plate in the cavity 118 of the handle 116. Alternative the method is to replace the grooves 288 and 290 with any detachable connection, as described in this application. Preferably, the stem 282 and the shaft 114 for adjusting the position of the thrust plate are located in the cavity 118, parts of the upper end 294 of the trigger mechanism 122 are included in one of the grooves 288 and 290, releasably securing the rod 282 and the shaft 114 for adjusting the position of the thrust plate in the cavity 118 When releasably securing the rod 282 and shaft 114 to adjust the position of the thrust plate in cavity 118, the grooves 288 and 290 and the upper end 294 of the rod 122 allow easy insertion of the rod 282 and shaft 114 to adjust the position of the thrust plate into cavity 118 and from treatment of it, which simplifies maintenance and replacement of these parts. The design of the cavity 118 and the properties of the components described above allow the user to clearly visualize them with the correct location and orientation. It also prevents the user from improperly assembling the tool staples.

The connecting shaft 292 has an opening 296 through which the tip 242 and connecting elements 244 of the shaft 114 pass to adjust the position of the thrust plate. The passage of the shaft 114 to adjust the position of the thrust plate through the hole 296 of the shaft 292 helps to center the shaft 114 inside the handle 116 and align the position of the shaft 114 to adjust the thrust plate inside the cartridge with brackets 108. The cartridge with brackets 108 (see FIGS. 1 and 2) is detachably connected with the distal end of the barrel 106 (see figure 3). The tip 242 of the connecting elements 244 of the shaft 114 for adjusting the position of the thrust plate extends inside the housing 110 (see FIG. 2) and is detachably connected to the channel 236 at the proximal end (see FIG. 2) of the metal shaft 216 of the thrust assembly 112 using a snap connection.

3, the lid of the holder 284 slides over the handle 116 and closes the stem 282, as well as a portion of the shaft 114 for adjusting the position of the thrust plate in the cavity 118. Preferably, the cover of the handle 284 has an opening 298 into which the threaded portion 132 of the handle 116 fits. Preferably when the hole 298 is U-shaped and is located on the lower side 300 of the cover of the handle 284 so that when the cover of the handle 284 slides over the handle 116, the abutment surface 302 of the cover 284 is pressed against the portion of the handle 116, which would indicate the correct position of the cover 284 from relative to the stem 282, and a portion of the reciprocating drive shaft 114 for adjusting the position of the thrust plate was located in the cavity 118. When the cover 284 slides on the handle 116, the cover 284 protects the stem 282 and the shaft 114 for adjusting the thrust plate in the cavity 118 and allows easy maintenance and replacements.

The barrel 106 is detachably connected to the handle 116 at the proximal end and to the cassette with brackets 108 (see figure 1) at the distal end. As used herein, the term “detachable” refers to a first component or part whose construction involves disconnecting or removing without damaging another component or part. In addition, the term “detachable connection” or “fastening” herein refers to connecting or securing the first part to the second part in such a way that each of them can be detached or removed without damaging any of the parts. This allows you to disconnect or unscrew the two parts from each other without damage, which makes the parts suitable for maintenance. The detachable connection may include a snap connection, a friction connection including parts held against each other by friction, a threaded connection, a magnetic connection or a mechanical connection, for example, using a hook and loop.

As for FIG. 3, it is preferable that the barrel 196 has a coupling nut 130 with an internal thread 304 forming a detachable connection with the threaded portion 132 of the handle 116. An alternative method is to replace the coupling nut 130 with any detachable connection as described herein. After detachable connection with the handle 116, the barrel 106 detachably fastens the cover of the holder 284 with the handle 116, making it easy to disassemble and maintain the circular stapling tool 100 and its components, for example, the barrel 106, the holder cover 284, the handle 116, the shaft 282 and the adjustment shaft 114 thrust plate position.

Due to the detachable connection of the barrel 106 with the handle 116, due to the detachable connection of the rod 282 and the shaft 114 to adjust the position of the thrust plate in the cavity 118, due to the possibility of sliding the cover 284 on the handle 116, due to the detachable connection of the shaft 114 to adjust the position of the thrust plate with the control element of the thrust plate 120, due to the detachable connection of the barrel 106 with the handle 116 or the detachable connection of the thrust plate system 112 (see FIG. 1) with the shaft 114 for adjusting the position of the thrust plate, assembly is simplified disassembly tool linking brackets 100, which allows the care and maintenance of the various components of the circular stapling instrument 100 staples.

On figa and 15B when assembling a circular stapling staple tool 100, the control element of the thrust plate 120 is detachably connected to the reciprocating drive shaft 114 to adjust the position of the thrust plate. Preferably, when the control element 120 is movably connected to the threaded adjusting part 286 at the proximal end of the shaft 114 to adjust the position of the thrust plate, so that the control element of the thrust plate 120 rotates on the threaded part 286. Typically, turning the control element of the thrust plate 120 anti-clockwise puts the device in the open position, and clockwise - to the closed.

Then, see FIGS. 16A and 16B, a part of the control plate of the thrust plate 120 and a part of the shaft 114 for controlling the thrust plate are detachably fixed in the cavity 118 of the handle 116. Preferably, the cavity 118 has a recess 306 corresponding to the part of the control element of the thrust plate 120, for releasably securing the control member of the thrust plate 120 and the reciprocating movement of the shaft 114 to adjust the position of the thrust plate in the cavity 118. Alternatively, the ratio of the protrusion and the recess may be the opposite. Immediately after the shaft 114 has entered to adjust the position of the thrust plate 118 in position 118A, parallel and lying on the same plane walls 114B and 114C (see Fig. 15B) adjacent to the cavity 118 are connected so as to prevent the rotational movement of the shaft 114 relative to the handle, but allow longitudinal movement.

On figa, 17B and 17C, the tip 242 and the connecting elements 244 of the shaft 114 for adjusting the position of the thrust plate enter the hole 296 of the connecting elements of the shaft 292 of the rod 282, and then the grooves 288, 290 of the rod 282 are located above and then on both sides of the upper the end 294 of the trigger mechanism 122, thereby releasably securing the stem 282, the shaft 114 for adjusting the position of the thrust plate and the control element of the thrust plate 120 in the cavity 118.

As shown in FIGS. 18A and 18B, the cover 284 then slides over the handle 116 and closes the stem 282 and part of the shaft 114 to adjust the position of the thrust plate in the cavity 118. Preferably, the threaded portion 132 of the handle 116 passes through the hole 298 in the cover 284, and the cover 284 slides until the abutment portion 302 of the cover 284 abuts against the portion 132a of the handle 116, which indicates the correct position of the cover 284.

On figa, 19B and 19C, the shaft 114 for adjusting the position of the thrust plate passes through the barrel 106 and is placed inside it, and the barrel 106 is detachably connected to the handle 116. Preferably, the barrel 106 has a connecting nut 130 with an internal thread 304, forming a detachable connection with the threaded portion 132 of the handle 116. The barrel 106 detachably secures the cover of the handle 284 on the handle 116.

2, the cassette with brackets 108 is detachably connected to the barrel 106, and the tip 242 of the shaft 114 for adjusting the position of the thrust plate passes through the central shaft of the cassette with brackets 108. Finally, the system of the thrust plate 112 is detachably connected to the shaft 114 for adjusting the position of the thrust plate through the connecting elements 244 of the shaft 114 to adjust the position of the thrust plate and the channel at the proximal end 236 of the metal shaft 216 of the system of the thrust plate 112.

20 and 21, according to one embodiment of the invention, a curved circular stapling tool 100A is shown comprising a cassette with brackets 108A having a housing 110A, a thrust plate 112C attached to the bent shaft 114A of the thrust plate opening mechanism, as discussed above, in avoid accidental removal of the thrust plate 112C, bent shaft 282A detachably connected to the flexible reciprocating drive shaft 114A to adjust the position of the thrust plate, handle cover 284A detachably connected to the handle 116A, a control element 120A detachably connected to the curved shaft 114A to adjust the position of the thrust plate through the threaded portion 286A, and an ergonomic curved barrel 106A with a connecting nut 130A detachably connected to the handle 116A through the threaded portion 132A. The curved circular stapling tool 100A includes curved components, for example, a flexible reciprocating drive shaft 114A for adjusting the position of the thrust plate, a curved rod 282A, and a curved barrel 106A to facilitate insertion into the body cavity of the mammal.

Due to the components that are releasably connected to each other, the circular stapling tool 100 or the curved circular stapling tool 100A is an open structure reusable stapling tool using a handle cover 284, 284A with a u-shaped opening 298, 298A, which allows to assemble additional components, for example, a shaft 114, 114A for adjusting the position of the thrust plate and the barrel 106, 106A mainly in the transverse direction. Cross-assembly provides better visibility and reduces assembly time, making assembly and disassembly easier. Thus, it often takes less than a minute to assemble an open-ended circular stapling tool 100 or a curved open-type circular stapling tool 100A. In addition, the open structure allows you to use the appropriate characteristics when you need to install components. In addition, due to the components detachably connected to each other, the circular stapling tool 100 or 100A is easy to assemble or disassemble, which allows you to clean or sterilize the circular stapling tool 100 or 100A after use.

22 to 28, according to one embodiment of the invention, the circular stapling tool 100D comprises a cassette with brackets 108D with a housing 110D, a thrust plate system 112D connected to a shaft 114D of the thrust plate opening mechanism, as discussed above, to prevent accidental removal of the thrust plate plates 112D, a stem 282D detachably connected to the shaft 114D for adjusting the position of the thrust plate, a handle cover 284D connected to the handle 116D, a control element 120D connected to the shaft 114D for adjusting the position of the thrust plate, and ox 106D with union nut 130D, 116D connected to the handle via the threaded portion 132D. Preferably, the circular stapling tool 100D is a curved circular stapling tool, as shown in the figure of the tool 100D, and contains curved components, such as a shaft 114D for adjusting the position of the thrust plate, a curved rod 282D and an ergonomic curved barrel 106D to facilitate the introduction of staple tool into the body cavity of a mammal. However, the circular stapling tool 100D does not need to be a curved circular stapling tool, as shown in the figure of the circular stapling tool 100D; it can relate to any type of circular stapling tool, such as a straight circular stapling tool, such as a circular stapling tool 100, and have relatively straight components, for example, a relatively straight shaft 114D for adjusting the position of the thrust plate, relative to a straight stem 282D and relatively straight trunk 106D.

The reciprocating drive shaft 114D for adjusting the position of the thrust plate includes first connecting elements 244D at the tip 242D of the shaft 114D for adjusting the position of the thrust plate and threaded connecting elements 286D at the base 402D of the shaft 114D for adjusting the position of the thrust plate. Preferably, the shaft 114D for adjusting the position of the thrust plate comprises a base 402D at one end and connecting elements 244D at the opposite end, as well as a flexible tie strap 400D, which may be flexible and curved, connecting the base 402D to the connecting elements 244D. 22 and 23, the stem 282D is movably connected by its first end 430D to the trigger 122D, and the second end 432D to the cassette with brackets 108D through the second connecting elements 416D. 28, the stem 282D forms a first connecting surface 406D that faces the corresponding second connecting surface 408D on the shaft 114D to adjust the position of the thrust plate. Preferably, the tie strap 400D forms a second connecting surface 408D directed toward the first connecting surface 406D of the stem 282D.

The circular stapling tool 100D further comprises an element for reducing friction 420D located between the first and second contacting surfaces 406D, 408D to reduce friction between the shaft 114D for adjusting the position of the thrust plate and the stem 282D. The movement of the shaft 114D to adjust the position of the thrust plate and the rod 282D begins when the trigger 122D is pressed against the handle 116D, as a result of which the rod 282D moves to the cassette with brackets 108D and is centered with it so that the brackets can be pushed out of the cassette 108D. The movement of the shaft 114D to adjust the position of the thrust plate 282D also occurs when the control 120D is activated, as a result of which the shaft 114D and the system of the thrust plate 112D connected to the tip 242D of the shaft 114D are moved to or from the cartridge with brackets 108D to adjust the distance between the cartridge and the brackets 108D and thrust plate 112D. Each time the shaft 114D moves to adjust the position of the thrust plate and the stem 282D, the shaft 114D forms a sliding connection with the stem 282D, and friction arises between the shaft 114D to adjust the position of the thrust plate and the stem 282D. The term "sliding joint" in this document means the movement of one surface over another while maintaining constant smooth contact between them. The friction between the shaft 114D for adjusting the position of the thrust plate and the stem 282D in a curved circular stapling tool 100D is usually 20-40% higher than in a relatively straight circular stapling tool 100D. In one embodiment, the circular stapling tool 100D is thus configured that the tie strap 400D exerts a contact force on the stem 282D, increasing friction between the stem 282D and the reciprocating drive shaft 114D to adjust the position of the thrust plate. By positioning the member 420D to reduce friction between the first and second contacting surfaces 406D and 408D, friction between the shaft 114D for adjusting the position of the thrust plate and the stem 282D can be reduced. There are other areas in which frictional forces arise between the stem 282D and other parts of the handle 116D when the trigger is pulled. These forces are reduced due to a certain surface angle of the grooves 288D and 290D of the stem 282D. As shown in FIG. 28B, the angular surface 288F may deviate from the vertical from 5 to 15 degrees. The result of this is a 1 decrease in the force of the rod 282D by 0-20%.

The friction reduction member 420D may be any mechanical device or chemical compound that can be used to reduce friction between two parts, for example, between a shaft 114D for adjusting the position of the thrust plate and a stem 282D. In particular, the member for reducing friction 420D reduces the coefficient of friction μ between two parts, which becomes lower than the normal coefficient of friction μ _normal between two parts without an element for reducing friction. Preferably, the member for reducing friction 420D provides a reduced coefficient of friction μ _reduced , which is at least 20% lower or preferably 40% below the normal coefficient of friction μ _normal between the two parts.

Chemical compounds for the 420D friction reduction element may include: hard coatings, including graphite, or polymer coatings, for example, Teflon. The chemical compounds to form the 420D friction reduction member can be applied in the form of coatings bonding to either surface 406D, 408D, or both. The chemical compounds to form the 420D friction reduction element can also be applied as coatings to freely moving intermediate components located between two surfaces 406D, 408D. The mechanical devices used to produce the 420D friction reduction member include any mechanical device capable of reducing friction between a pair of surfaces, such as a ball or roller bearing. The friction reducing member 420D may be coupled to a shaft 114D to adjust the position of the thrust plate, or to the stem 282D, or both. The 402D friction reduction member is designed so that it does not rub off or deteriorate when cleaning and maintaining the handle for reuse.

25-27, one embodiment of the invention is shown in which the member for reducing friction 420D includes a roller 404D connected to the stem 282D via a pin 412D and located in a cavity 410D formed in the stem 282D. Preferably, the pin 412D is located in the hole 414D formed in the stem 282D. Preferably, more than one 404D roller, such as three rollers, is connected to the stem 282D. In one embodiment, the hole 414D is a circular hole into which the pin 412D enters, as shown in FIG. 26, with limited movement of the pin 412D. In one embodiment, the hole 414D is a generally oval-shaped hole through which a pin 412D is inserted, the latter may make lateral movements to or from either end 430D, 432D of the rod 282D; however, the up-down movement of the pin 412D, not related to the movement from or to either end 430D, 432D of the rod 282D, provides an additional degree of freedom compared to the previous embodiment of the invention.

On Fig shows a perspective image of the annular blade 126 of the cartridge with the staples 108 of the circular stapling staple tool 100, shown in Fig.4. As shown in FIG. 29, the annular blade 126 comprises an annular cutting edge 192 and a part 308 connecting to a split washer. An annular blade 126 comprising an annular cutting edge 192 and an element for securing a split washer 308 is made of metal, for example, stainless steel. In other embodiments of the invention, the annular blade 126 may be made of any material strong enough to cut through the fabric. The washer fixing member 308 includes a plurality of engaging teeth starting from the portion 310 of the annular blade 126 adjacent to the cutting edge 192. The washer fixing member 308 extends inwardly at an indirect angle 312 with respect to the cutting edge 192. The indirect angle 312 may be within from 56 to 60 degrees. In other embodiments, an indirect angle may range from 30 to 60 degrees. In other embodiments of the invention, the detachable washer element 308 may be made of various materials, vary in quantity, shape, size, location, direction, or configuration with respect to the annular blade 126. For example, in other embodiments, the detachable fastener element 308 the washers may contain a locking protrusion, a depression or other type of connecting element.

FIG. 6 shows the base surface of the thrust plate 220 of the thrust plate system 112 of the cassette unit 102 of the circular stapling tool 100 in the open position, away from the housing 110, the ejector brackets 156 and the attached annular blade 126 are in front of the cut in the housing 110. An annular split washer 214 is pressed into the cavity 222 of the base of the abutment plate 220 of the abutment plate 210. The protective portion 314 is attached with a hook 316 to the upper part 318 of the annular washer 214 located in the cavity 222 of the base of the abutment plate 220.

On Fig shows an enlarged image of a split washer 214 connected to the protective element 314. The protective element 314 contains an annular protective cap made of polycarbonate, painted in red. In other embodiments, the security element 314 may vary in manufacturing material, shape, size, location, color, or configuration and may be attached to the ring washer 214 using various attachment mechanisms. In other embodiments, the protective element 314 may not be used, and the annular split washer 214 may be pressed into the cavity 222 of the base of the thrust plate 220 without the protective element 314.

7 shows the base of the thrust plate 220 of the thrust plate system 112, moved to the closed position with respect to the housing 110 and close to it, with the ejector brackets 156 and the attached annular blade 126 still in the position before actuation, enclosed in the housing 110 and separated from the detachable washer 214. In this position, before actuation, the flexible locking elements 178 of the ejector brackets 156 are detachably connected to the protrusions 180 of the housing 110 to form a connection that impedes the movement of the ejector brackets 156 until it is not certain force is applied. In other embodiments, the flexible locking member 178 and locking tabs 180 may include various types of related parts.

FIG. 31 shows a staple ejector 156 and an annular blade 126 connected thereto after the trigger is depressed, as a result of which the staple ejector 156 is moved relative to the housing 110 from its initial position to the position where the cutting edge 192 of the annular blade 126 is inserted into the annular washer 214 and cuts off a tissue fragment, while the base of the thrust plate 220 of the system of the thrust plate 112 is in the closed position. During sewing, the locking elements 178 of the ejector brackets 156 are released from the protrusions 180 of the housing 110, allowing the ejector brackets 156 to move beyond a certain point 320 relative to the housing 110.

On Fig shows an enlarged image of the cutting edge 192 of the annular blade 126 shown in Fig, included in the ring washer 214. The cutting edge 192 cuts the grid 320 located between the walls 322 and 324, the ring washer 214. In this case, the element for fixing the washer 308 is fixedly fixed to one of the walls 322 of the split ring washer 214, blocking the ring blade 126 in the ring washer 214, while the protective element 314 (see Fig. 31) is still attached to the upper part 318 (see Fig. 31) of the ring washer 214 located in the cavity 222 of the base of the thrust plate 22 0.

FIG. 33 shows the base of the thrust plate 220 of the system of the thrust plate 112, pushed back to the open position from the housing 110 after actuating the ejector staples 156 and the attached annular blade 126 that engages in the split ring washer 214. The split ring washer 214 remains locked on in its place above the annular blade 126 due to the element 308 for fixing the washer 314, still attached to the upper part 318 of the annular washer 214 and acting as a protective barrier over the cutting edge 192 of the annular blade 126. Protective element 314 prevents inadvertent cutting edge section 192 of the annular blade 126 after activation of the trigger mechanism. At least one of the elements — the annular split washer 214 or the protective element 314 — has a visual indicator 326 showing, as a precaution, that the ejector brackets 156 and the attached annular blade 126 are actuated. The visual indicator 326 includes a first color different from the second color of the case 110 of the circular stapling tool 100. In other embodiments, the visual indicator 326 may include any type of visual indicator showing when the ejector brackets 165 and the attached annular blade 126 are actuated. In another embodiment, only the inside of the ring washer 214 and the visual indicator 326 remain attached to the ring blade 126 after being cut. The outer part of the washer 214 remains attached to the base of the thrust plate 220 after opening the staples of the tool.

FIG. 34 shows the thrust plate 210 of the thrust plate system 112 of FIG. 33, taken from the circular stapling tool 100, after actuating the ejector staples 156 and the annular blade 126 connected thereto and cutting off the washer 214, wherein the annular split the washer 214 and the protective element 314 remain attached to the annular blade 126 due to the element for securing the washer 308. The protective element 314 continues to prevent the cutting edge 192 from accidentally cutting the annular blade 126 after actuating the ejector Atelier bracket 156 and connected thereto an annular blade 126. In addition, the visual indicator 326 continues to show that the ejector clips 156 and 126 attached circular blade powered.

FIG. 35 shows a new thrust plate 210C when attempting to attach to the circular stapling tool 100 shown in FIG. 34. As shown in FIG. 36, the protective member 314 attached to the annular washer 214 that is attached to the annular blade 126 actuated prevents the new thrust plate 210C from attaching to the circular stapling tool 100. As shown in FIG. 35, this is due to in that the diameter 328 of the protective element 314 is larger than the inner diameter 330 of the new annular washer 332. Even if the protective element 314 is not attached to the annular washer 214, the annular split washer 214 will still prevent the attachment of a new thrust plate 210C to the circular stapling tool 100 because the annular split washer 214 has a diameter of 334 equal to or greater than the inner diameter 330 of the new annular washer 332.

To use the circular stapling tool 100 shown in FIG. 34 repeatedly, the cassette unit 102 shown in FIGS. 1-2 can be removed from the circular stapling tool 100, thereby removing the annular blade 126 and the washer 214 connected thereto after cut. After sterilizing the remainder of the circular stapling instrument 100 (for example, the handle 116 and other components shown in FIG. 1), another unused cassette unit may be attached to them containing a new annular blade and a new annular split washer to use the circular stapling instrument 100 repeatedly. On Fig shows a diagram of one of the embodiments of the invention is a method 340 for fixing the blade on a split washer circular stapling tool staples. At 342, a circular stapling tool is presented. The circular stapling staple tool comprises a housing, a staple ejector, a thrust plate system, and a blade. The bracket ejector is movably located inside the housing. The thrust plate system comprises a split washer attached to the surface of the base of the thrust plate. The blade is attached to the ejector brackets.

At 344, the thrust plate system is moved from an open position away from the housing to a closed position near the housing. At step 346, the staple ejector moves from a starting position in which the blade does not fit into the washer and in which the washer attachment member on the blade is not attached to the washer, to a flashing position in which the blade enters the washer and the washer fixation member on the blade is rigidly attached to the puck. The washer fixing member may include at least one tooth for holding the washer on the blade, located at an indirect angle to the cutting edge of the blade. An indirect angle can range from 56 to 60 degrees. In other embodiments, an indirect angle may range from 30 to 60 degrees. In further embodiments, the washer fixing member may be different. In one embodiment, step 346 includes a blade that cuts the washer net and at least one lock member that is rigidly attached to one of the washer walls.

At an additional step 348, any of the following is possible: the washer may come into contact with one or more components of the circular stapling tool, preventing the blade from being drawn into the housing and reused; the washer or the protective element attached to it can act as a protective barrier over the blade; or a visual indicator of the washer may indicate that the bracket ejector has been activated.

In an additional step 350, the following steps are possible: the cassette unit can be removed from the circular stapling tool, thereby removing the used blade and washer; the remainder of the circular stapling instrument can be sterilized; and a new cassette unit containing a new blade and a new washer may be attached to the circular stapling tool before reusing the circular stapling tool. In other embodiments, one or more of the steps of method 340 may be different.

The result of one or more embodiments of the invention can be any of the following: preventing the unintentional re-activation of the used blade of the circular stapling tool, and thus improving cleanliness and safety; prevention of an accidental cut with the used annular blade of a circular stapling tool; preventing erroneous actuation of the circular stapling tool; or benefits of a different type.

FIGS. 38-46 show various images of the circular stapling tool 100 of the embodiment of FIGS. 1 and 2, depicting the locking mechanism 352 in different states, which can be used with any embodiment of the invention to protect against accidental actuation of the trigger mechanism 122 and the corresponding ejector brackets 156. Figs. 38-40 show various images of the system of the thrust plate 112 in the open position, outside the flashing zone, away from the housing 110, with the trigger fur by 122 and indirectly connected with it by the ejector staples 156, locked in position before flashing. When the system of the thrust plate 112 is moved to the open position, away from the flashing zone and the housing 110, when using the attached shaft 114 to adjust the position of the thrust plate and the control element of the thrust plate 120, the base surface of the thrust plate 220 is located at a distance of 354 in the range from 0, 25 to 7.62 cm from the end of the guide brackets 148. In this position, before flashing, the threaded end 285 of the shaft 114 for adjusting the position of the thrust plate is located inside the inner part 358 of the corresponding threaded Shaft 360 swashplate control element 120 and away from the end 362 of the threaded shaft 360 of the corresponding stop plate 120 the control.

The edge 364 of the trigger 122 abuts against the first portion 366 of the shaft 114 to adjust the position of the thrust plate, acting as a locking mechanism 352 and preventing the trigger device 122 from being rotated in the direction 124. The second portion 370 of the shaft 114 for adjusting the position of the thrust plate is located away from edges 364. Edge 364 includes opposing walls 372 and 374 located at a distance of 376 equal to 0.48 cm from each other. The width 378 of the first part 366 of the shaft 114 for adjusting the position of the thrust plate is 0.74 cm. The width 380 (see FIG. 43) of the second part 370 of the shaft 114 for adjusting the position of the thrust plate is 0.43 cm. The trigger 122 cannot be rotated in direction 124 due to the fact that the width 378 of the first part 366 is greater than the distance 376 between the opposite walls 372 and 274 of the edge 364.

The upper end 294 of the trigger 122 mates with the groove 288 and 290 (see FIG. 3) by the rod 282. The upper end 294 of the trigger 122 includes opposing surfaces 294A and 294B spaced 382 apart from each other. This is 1.46 cm. 382 between the opposing surfaces 294A and 294B is larger than the width 378 of the first part 366, which allows the opposing surfaces 294A and 294B to extend into the grooves 288 and 290 above the first part 366. The end 384 of the rod 282 is located away from the end 386 of the ejector brackets 156. As a result, what's the first part 366 of shaft 114 for adjusting the position of the thrust plate blocks the trigger 122 from rotating in the direction 124, the end 384 of the rod 282 mating with the trigger 122 remains in a position remote from the end 386 of the ejector brackets 156, which holds the ejector brackets 156 in a locked position before flashing.

FIGS. 41-43 show various images of the system of the thrust plate 112 in the closed position (in the flashing zone) close to the housing 110, with the trigger mechanism 122 and indirectly connected to it by the ejector brackets 156 in the unlocked state, ready for flashing, but still not powered, as shown in FIGS. 38-40. When the system of the thrust plate 112 is located in the closed position (in the flashing zone) and is approached to the housing 110 by the attached shaft 114 and the control element of the thrust plate 120, the base surface of the thrust plate 220 is located at a distance of 388 (in the range from 0.15 to 0, 25 cm) from the end of the ejector brackets 148. The control 120 rotates, which causes the threaded end 286 of the shaft 114 to adjust the position of the thrust plate to move in the direction 390 from the inner part 358 of the corresponding threaded shaft 360 of the control the pore plate 120 to the end 362 of the corresponding shaft 360 of the control element of the thrust plate 120. As a result of this movement, the first part 366 of the shaft 114 for adjusting the position of the thrust plate moves in the direction 390 and moves away from the opposite walls 372 and 374 of the edge 364, so the first part 366 is no longer creates obstacles for the edge 364. The second part 370 of the shaft 114 also moves in the direction 390 away from the edge 364 to a position above the edge 364.

Due to the fact that the width 380 of the second part 370 is less than the distance 376 between the opposite walls 372 and 374 of the edge 364, the trigger 122 can be freely actuated, since it will not abut against the adjacent second part 370. Opposite surfaces 294A and 294B the upper end 294 of the trigger 122 is still included in the grooves 288 and 290 (see FIG. 3) of the rod 282. Since the trigger 122 was not rotated in the direction 124 and, although unlocked, is in the position before flashing, the trigger 122 is not set in motion the corresponding rod 282, and The edge 384 of the rod 282 is still located away from the end 386 of the ejector brackets 156, so the ejector brackets 156 are not yet actuated, but ready for it.

Figures 44-46 show different images of the system of the thrust plate 112, located in the closed position, in the stitching area in contact with the housing 110, with the trigger mechanism 122, turned in the direction 124, that is, actuated and actuated the ejector brackets. The trigger 122 could be actuated since the first part 366 of the shaft 114 was previously moved to position 390 away from the edge 364, so that the first part 366 is no longer an obstacle to the edge 364, and the width 380 of the second part 370 is returned the translational drive shaft 114 for adjusting the position of the thrust plate is less than the distance 376 between the opposite walls 372 and 374 of the edge 364, which allows you to trigger the trigger mechanism 122 without obstacles from the side of the second part 370.

When the trigger 122 is actuated, when the trigger 122 is turned in the direction 124, the opposite surfaces 294A and 294B of the upper end 294 of the trigger 122 move in the direction 392, abutting against the corresponding grooves 288 and 290 (see FIG. 3) of the rod 282, which causes the stem 282 to also move in direction 392. This movement forces the end 384 of the stem 282 to abut against the end 386 of the ejector brackets 156, which causes the ejector of the brackets 156 to also move in the direction 392. While actuating the ejector of the brackets 156, the movement Alkali staples 156 pushes the bracket 104 (see Fig.7 and 31) from the annular cassette for staples 148 (see Fig.4-5, 7 and 31), and the annular blade 126 connected to the ejector staples 156, as described previously, cuts off a piece of tissue (see Fig.31).

Thus, the locking mechanism 352 automatically prevents accidental actuation of the trigger mechanism 122 and the corresponding ejector staples 156 and, therefore, the stitching of the fabric with staples 104 (see Figs. 7 and 31), and the user of the circular stapling tool does not have to activate the locking mechanism manually . In addition, the locking mechanism 352 automatically locks the trigger 122, the corresponding ejector of the staples 156 and the brackets 104 (see FIGS. 7 and 31) in the pre-flashing position when the stop plate system 112 is in the open position, and automatically releases the trigger 112 and the corresponding ejector brackets 156 with brackets 104 (see Fig.7 and 31) when the system of the thrust plate 112 is in the closed position. The locking mechanism 352 acts in this way regardless of the number of openings and closures of the thrust plate 112 system or the triggering of the trigger mechanism 122 and the corresponding ejector brackets 156 with brackets 104 (see FIGS. 7 and 31).

FIG. 47A shows another embodiment of the invention — the circular stapling tool of FIG. 1, with another locking mechanism 352A, preventing the pusher 156 from moving when the cartridge unit 108 (see FIG. 2) is attached to the handle 116 (see Fig. 2) and the thrust plate 210 is in the open position. Under such conditions, when the thrust plate 210 is in the open position, the portion 114E of the shaft 114 for adjusting the position of the thrust plate adjacent to the flexible locking elements 178 has a size, width or diameter 401 (see FIG. 3B) less than the hole width or diameter 196A. the round inner shaft 194 of the ejector staples 156, but close enough to it in size, so the distance 400 to the flexible locking elements 178 between the shaft portion 114E for adjusting the position of the thrust plate 114 and the surface of the inner hole 196B is insufficient for deflection and disengagement with the locking protrusions 180, which, in turn, impedes the movement and actuation of the ejector staples 156. As shown in FIG. 48B, when the thrust plate 210 is in a position close to the closed, narrower shaft portion 114F 114 to adjust the position of the thrust plate adjacent to the flexible locking elements 178, has a size, width or diameter 402 (see FIG. 3A) smaller than the width or diameter 196A of the hole 196 of the round inner shaft 194 of the ejector brackets 156, so that the flexible locking elements 178 had a sufficient distance 400 between the shaft 114 portion 114F for adjusting the thrust plate and the surface of the inner hole 196B for deflection and disengagement with the locking protrusions 180, which, in turn, allows movement and actuation of the ejector staples 156.

An abstract of the invention is provided in order to enable the reader to quickly become familiar with the nature of the technical invention. It is provided with the understanding that it will not be used for interpretation and will not limit the scope of the patent application. In addition, in the foregoing detailed description, it can be seen that various characteristics are grouped together in various embodiments of the invention in order to simplify the description of the invention. Such a disclosure method should not be understood in such a way that the claimed embodiments require more features than are described in each application. Rather, as the following paragraphs reflect, the subject matter of the invention includes fewer characteristics than all the characteristics of one claimed embodiment. Thus, the following paragraphs are included in the detailed description, with each paragraph in itself describing a separate subject of the application. While various embodiments of the invention have been described, it will be apparent to those skilled in the art that other embodiments and implementations are possible within the scope of this disclosure. Accordingly, this disclosure should not be limited, with the exception of limitations in light of the foregoing paragraphs and their equivalents.

Claims (12)

1. A rechargeable cassette block circular stapling tool staples containing:
housing;
cassette for brackets attached to the body;
a bracket ejector comprising a leveling surface of the bracket ejector, wherein the bracket ejector is arranged to be placed inside the housing and moved in the housing from the original to the operating position; and
a stop assembly comprising a stop base, a leveling surface of the stop, a surface for forming brackets, a stop shaft and a metal shaft attached to the stop shaft, wherein the leveling surface of the stop is made only on the stop shaft and extends from the upper part of the stop shaft to the lower part of the stop shaft, moreover, the base of the emphasis is configured to move from an open position at a distance from the housing to a closed position near the housing;
wherein the leveling surface of the stop is adapted to mate with the leveling surface of the ejector brackets and is designed to align with the rotational movement of the surface to form brackets and cassette for brackets in the closed position of the base of the stop. 2. The rechargeable cassette unit according to claim 1, in which the leveling surface of the ejector brackets has at least one groove. 3. The rechargeable cassette unit according to claim 1, wherein the leveling surface of the stop has at least one slot. 4. The rechargeable cassette unit according to claim 1, wherein the staple ejector has an inner shaft located inside the staple ejector, wherein the inner shaft is separated from the inner surface of the staple ejector and has an opening extending inside the inner shaft, and the stop assembly comprises an emphasis shaft included in hole of the inner shaft. 5. Rechargeable cassette unit according to claim 4, in which the leveling surface of the ejector brackets contains at least one groove located within the inner shaft. 6. The rechargeable cassette unit according to claim 1, in which the thrust unit comprises a stop shaft included in the hole of the ejector brackets, and the leveling surface of the stop contains at least one spline of the stop shaft. 7. The rechargeable cassette unit according to claim 1, wherein the staple ejector comprises an inner shaft with an opening located inside the inner shaft, the leveling surface of the staple ejector contains at least one groove located within the inner shaft, and the leveling stop surface comprises at least one slot of the stop shaft, while the stop shaft is configured to enter the hole of the inner shaft. 8. The rechargeable cassette unit according to claim 1, wherein the leveling surface of the bracket ejector is located at one end of the bracket ejector. 9. The rechargeable cassette unit according to claim 1, in which the alignment surface of the emphasis extends from a portion of the emphasis shaft adjacent to the base of the emphasis only partially along the emphasis shaft, or in which the alignment surface of the emphasis extends from the upper portion of the emphasis shaft to the lower portion of the emphasis shaft and the shaft the emphasis is detachably connected to a metal shaft. 10. The rechargeable cassette unit according to claim 1, wherein the leveling surface of the stop is made without being mated to the leveling surface of the ejector brackets, so that the surface of the formation of the brackets is not aligned with the rotational movement with the cartridge for the brackets when the base of the stop is open. 11. A circular stapling tool containing:
handle;
trigger mechanism;
focus control; and
a rechargeable cassette unit according to any one of the preceding paragraphs, wherein the bracket ejector is located in the housing and is configured to move in the housing when the trigger is actuated from the initial to the operating position; moreover, the base of the stop using the stop control element is arranged to move from an open position at a distance from the housing to a closed position near the housing,
however, when the base of the stop is in the closed position, the leveling surface of the stop is mated with the leveling surface of the ejector brackets, and thus the surface of the formation of the brackets is aligned in a rotational movement with the cartridge for brackets. 12. The circular stapling tool according to claim 11, further comprising a barrel, the handle and the housing being detachably connected to the barrel.

Images