CN218870406U - Incision knife - Google Patents

Abstract

The utility model relates to a incision sword, incision sword include the tool tube subassembly, and the opening has been seted up to the outer peripheral face of tool tube subassembly. The cutter wire penetrates through the cutter tube assembly and is connected with the far end of the cutter wire and the far end of the cutter tube assembly, and part of the cutter wire is exposed out of the cutter tube assembly through the opening to form a cutting edge for cutting. The expansion sleeve is sleeved at the far end of the knife tube assembly, and the peripheral side of the expansion sleeve is provided with a spreading structure. Above-mentioned incision sword has optimized the operation step, reduces the operation degree of difficulty, has reduced operation cost and operation time, and the problem that the seal wire shifted when having avoided switching apparatus simultaneously and leads to needing to carry out the intubate again has then reduced the risk of complications such as pancreatitis that the intubate leads to repeatedly.

Description

Incision knife

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a incision sword.

Background

ERCP (endoscopic retrograde cholangiopancreatography) has the advantages of small wound, short operation time, fewer complications and the like because of no need of operation. In a few decades, ERCP has achieved great clinical results and has become one of the important methods for the treatment and diagnosis of pancreatic and biliary diseases. In ERCP operation, the physician first puts the duodenoscope from the mouth, passes through the esophagus and stomach to reach the duodenal papilla; then an incision knife or a choledochoscope is inserted into the duodenoscope instrument channel, the choledocreatic duct is reached through the duodenal papilla under the assistance of X-ray fluoroscopy, finally contrast fluid is injected to observe the pathological change condition inside the choledocreatic duct, and necessary treatment is carried out, such as drainage tube and stent, lithotripsy and stone extraction, stenosis dilatation and the like.

In therapeutic ERCP, the problem of biliary stenosis is addressed by conventional methods, which mostly require a first duodenal papillary sphincterotomy (EST) followed by a balloon papillary dilatation to finally complete the common bile duct stent implantation. In order to ensure the passability of the common bile duct stent, firstly a guide wire is inserted, then the guide wire is fed into a cutting knife along the guide wire, the cutting knife is used for cutting the duodenal papilla sphincter and the tail end part of the common bile duct, the cutting knife is withdrawn after the sphincter is cut, then the guide wire is fed into a balloon cutter tube or an expansion bougie along the guide wire, the balloon cutter tube or the expansion bougie is used for carrying out narrow section expansion, the stent is withdrawn after the ideal expansion diameter is reached, and finally the guide wire is placed into the stent for drainage. The whole process needs to switch various instruments, and the operation is complex. If the guide wire is displaced or slips after being left, the guide wire needs to be reinserted. Moreover, the papilla has various shapes, and the internal sphincter muscle of the papilla is easy to contract when meeting mechanical stimulation to cover the common segment of the bile and pancreatic ducts, so that the common segment is difficult to intubate, and repeated blind insertion easily causes inflammation and a series of postoperative complications.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a cutting knife to solve the problem of difficult intubation in ERCP operation.

In one aspect, the present application provides a cutting knife comprising:

the outer peripheral surface of the cutter tube component is provided with an opening;

the cutter wire penetrates through the cutter tube assembly and is connected with the far end of the cutter tube assembly, and part of the cutter wire is exposed out of the cutter tube assembly through the opening to form a cutting edge for cutting; and (c) a second step of,

the expansion sleeve is arranged at the far end of the knife tube assembly, and a stretching structure is arranged on the outer peripheral surface of the expansion sleeve.

The technical solution of the present application is further described below:

in one embodiment, the expansion structure comprises a thread structure arranged on the outer peripheral surface of the expansion sleeve; or, the strutting structure comprises a plurality of annular bulges which are sequentially arranged along the direction from the far end to the near end of the expanding sleeve, and the diameters of the annular bulges are sequentially increased along the direction from the far end to the near end of the expanding sleeve.

In one embodiment, the expanding sleeve further comprises a sleeve body, the sleeve body is sleeved on the distal end of the knife tube assembly, and the expanding structure is arranged along the circumferential direction of the sleeve body.

In one embodiment, the distraction structure has an expanded state in which the distraction structure expands in a radial direction of the sheath and a contracted state; in the contracted state, the expanding structure is contracted along the radial direction of the sleeve body.

In one embodiment, the spreading structure includes a body sleeved on the sleeve body and a turnable part connected to the body in a turnable manner, the turnable part protrudes out of the outer peripheral surface of the body along the radial direction of the body in the unfolding state, and the turnable part is attached to the outer peripheral surface of the sleeve body or the outer peripheral surface of the body in the contracting state.

In one embodiment, the incision knife further comprises a sheath tube axially movably sleeved outside the knife tube assembly, and when the sheath tube moves to be sleeved outside the expansion sleeve relative to the knife tube assembly towards the distal end, the sheath tube drives the reversible part to be switched from the unfolding state to the folding state.

In one embodiment, one of the body and the turnable part comprises an electromagnetic element, and the other comprises a magnetically attractable element, wherein the electromagnetic element is used for adsorbing the magnetically attractable element to enable the turnable part to enter a contracted state, or the electromagnetic element releases the magnetically attractable element to enable the turnable part to enter an expanded state.

In one embodiment, the knife tube assembly comprises a multi-cavity tube and an end socket connected to the far end of the multi-cavity tube, the multi-cavity tube is provided with a first cavity, the opening is formed in the outer peripheral surface of the multi-cavity tube and communicated with the first cavity, and the knife wire penetrates through the first cavity and is connected with the end socket.

In one embodiment, the incision knife further comprises a camera and a wiring harness electrically connected with the camera, the multi-cavity tube is further provided with a second cavity, the camera is arranged on the end head seat, and the wiring harness penetrates through the second cavity.

In one embodiment, the end head seat is in a truncated cone shape, the expansion sleeve comprises an expansion part sleeved on the end head seat and a threaded part sleeved on the distal end of the multi-cavity tube, the expansion part is in a truncated cone shape, and the taper of the expansion part is matched with that of the end head seat.

In one embodiment, the incision knife further comprises a handle and a finger ring axially movably arranged on the handle, the handle is connected with the proximal end of the multi-cavity tube, the finger ring is connected with the proximal end of the knife wire, and the finger ring is used for pulling the knife wire.

In one embodiment, the multi-lumen tube further defines a first instrument channel extending through both ends of the multi-lumen tube, and the tip seat defines a second instrument channel extending through both ends of the multi-lumen tube, wherein the first instrument channel is communicated with the second instrument channel.

The cutting knife is characterized in that the knife wire is arranged in the knife tube component in a penetrating mode, and the part of the knife wire is exposed out of the knife tube component through the opening in the outer peripheral surface of the knife tube component to form the cutting edge, so that the cutting edge of the knife wire can cut the papillary sphincter of duodenum by pulling the near end of the knife wire. And the expansion sleeve is sleeved at the far end of the knife tube assembly, and the expansion structure is arranged on the peripheral surface of the expansion sleeve, so that when the knife tube assembly passes through the narrow section of the sphincter channel or the bile duct channel, the expansion structure on the peripheral side of the expansion sleeve can expand the narrow section of the sphincter channel or the bile duct channel to expand the narrow section of the sphincter channel or the bile duct channel, and the knife tube assembly after the expansion sleeve can pass through the expansion sleeve smoothly. And compare in the traditional operation flow that adopts earlier the incision sword cutting to adopt again to use gasbag sword pipe or expansion bougie to carry out the expansion of narrow section, the incision sword of this application can accomplish the process of cutting and expansion simultaneously, the number of times of surgical instruments and switching apparatus has been reduced, thereby optimized the operation step, reduce the operation degree of difficulty, operation cost and operating time have been reduced, the problem that the seal wire shifted when having avoided switching apparatus simultaneously leads to needing to carry out the intubate again, and then reduced the risk of pancreatitis waiting complications that the intubate leads to repeatedly.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a structure of a cutting blade according to an embodiment;

FIG. 2 is a schematic view of an embodiment of the expansion sleeve;

FIG. 3 is a schematic view of the expanded sleeve shown in FIG. 2 from another perspective;

FIG. 4 is a cross-sectional view of a multi-lumen tube according to one embodiment;

FIG. 5 is a front view of an embodiment of a terminal header;

FIG. 6 is a side elevational view of the tip carrier illustrated in FIG. 5;

FIG. 7 is a schematic view of an embodiment of the engagement between the expansion sleeve and the header;

FIG. 8 is a schematic view of an embodiment of the expandable sleeve in an expanded state;

FIG. 9 is a schematic view of the expanded sleeve shown in FIG. 8 in a contracted state;

FIG. 10 is a schematic view of an alternative embodiment of the expandable sleeve in an expanded configuration;

fig. 11 is a schematic view of the expanded sleeve shown in fig. 10 in a contracted state.

Description of reference numerals:

10. a knife tube assembly; 11. a multi-lumen tube; 111. a straight pipe section; 112. a curved section; 101. a first channel; 102. a second channel; 103. a first instrument channel; 12. an end head seat; 121. a second instrument channel; 122. a first mounting hole; 20. cutting; 30. an expansion sleeve; 31. a sleeve body; 311. a threaded portion; 312. an expanding portion; 32. a thread structure; 321. a body; 322. a reversible part; 33. avoiding the mouth; 41. a handle; 42. a ring; 51. a wire harness; 60. a sheath tube.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In this embodiment, "distal" refers to the end distal to the operator, and "proximal" refers to the end proximal to the operator. "axial" means along the axis of a whole or component; "circumferential" refers to a direction of rotation about the "axial" direction. "radial" means a direction perpendicular to the axis of the whole or component.

An embodiment of the present application provides an incision knife for incising the papillary sphincter of the duodenum during ERCP procedures. It is noted that the incision knife of the present application may also be used in other procedures. Specifically, referring to fig. 1 to 3, the incision knife of an embodiment includes a knife tube assembly 10, and an opening is formed on an outer circumferential surface of the knife tube assembly 10. The cutter wire 20 is arranged through the cutter tube assembly 10, and the distal end of the cutter wire 20 is connected with the distal end of the cutter tube assembly 10, and part of the cutter wire 20 is exposed out of the cutter tube assembly 10 through the opening to form a cutting edge for cutting. The expansion sleeve 30 is fixedly sleeved on the distal end of the knife tube assembly 10, and the outer peripheral surface of the expansion sleeve 30 is provided with a propping structure for propping up the papillary sphincter of the duodenum and the narrow section of the bile duct channel, preferably, the propping structure comprises a thread structure 32. Preferably, the expanding sleeve 30 further includes a sleeve body 31, the sleeve body 31 is sleeved on the distal end of the knife tube assembly 10, and the thread structure 32 is disposed along the circumferential direction of the sleeve body 21.

Further, in order to break through the papillary sphincter of duodenum and the narrow section of the bile duct channel, the conventional incision knife is usually made as small as possible in the head portion before the blade to ensure smooth intubation. However, the thin head end portion is not rigid enough to open the sphincter or the stenosis, and is also apt to stab human tissues.

In the incision knife according to an embodiment of the present application, the knife wire 20 is inserted into the knife tube assembly 10, and a portion of the knife wire 20 is exposed to the knife tube assembly 10 through the opening on the outer circumferential surface of the knife tube assembly 10 to form a cutting edge, so that the cutting edge of the knife wire 20 can cut the papillary sphincter of duodenum by pulling the proximal end of the knife wire 20 by pulling the knife wire 20. The distal end of the knife tube component 10 is sleeved with the expansion sleeve 30, and the outer peripheral surface of the expansion sleeve 30 is provided with the thread structure 32, so that when the knife tube component 10 passes through the narrow section of the sphincter channel or the bile duct channel, the expansion sleeve 30 can be driven to rotate by rotating the knife tube component 10, when the expansion sleeve 30 rotates, the thread structure 32 on the outer peripheral side of the expansion sleeve 30 can be matched with the wall of human tissue to apply an axial force to the expansion sleeve 30, so that the expansion sleeve 30 can gradually go deep and prop open the narrow section of the sphincter channel or the bile duct channel, the narrow section of the sphincter channel or the bile duct channel can be expanded, and the knife tube component 10 after the expansion sleeve 30 can smoothly pass through the knife tube component. And compare in the traditional operation flow that adopts earlier the incision sword cutting to adopt again to use gasbag cutting knife pipe or expansion bougie to carry out the narrow section expansion, the incision sword of this application can accomplish the process of cutting and expansion simultaneously, the number of times of surgical instruments and switching apparatus has been reduced, thereby the operation step has been optimized, reduce the operation degree of difficulty, operation cost and operating time have been reduced, the problem that the seal wire shifted when having avoided switching apparatus simultaneously and leads to carrying out the intubate again, and then reduced the risk of pancreatitis waiting complications that the intubate leads to repeatedly.

It should be noted that, in another embodiment, the opening structure may also include a plurality of annular protrusions sequentially arranged along the distal end to the proximal end direction of the expanding sleeve 30, and the diameters of the annular protrusions sequentially increase along the distal end to the proximal end direction of the expanding sleeve 30, so that when the incision knife passes through the narrow section of the sphincter channel or the bile duct channel, the plurality of sequentially increasing annular protrusions can gradually open the narrow section of the sphincter channel or the bile duct channel, thereby ensuring that the incision knife smoothly passes through the narrow section of the sphincter channel or the bile duct channel, and solving the problem of difficult intubation.

Referring to fig. 4 and 5, in the present embodiment, the knife tube assembly 10 includes a multi-lumen tube 11 and an end socket 12 connected to a distal end of the multi-lumen tube 11, wherein the multi-lumen tube 11 has a first lumen 101 penetrating through two ends thereof, a knife wire 20 is inserted into the first lumen 101, and a distal end of the knife wire 20 is fixedly connected to the end socket 12. Further, the multi-lumen tube 11 and the tip holder 12 may be nested, threaded, bonded, or the like. Of course, in other embodiments, the multilumen tubing 11 may be integrally designed with the tip carrier 12.

Alternatively, referring to fig. 1, the multilumen tube 11 includes a straight tube section 111 and a curved section 112 connecting the straight tube section 111 and the tip seat 12, the opening is provided in the curved section 112, by providing the opening in the curved section 112, the knife wire 20 can be exposed outside the knife tube assembly 10 when passing through the curved section 112, and the curved section 112 can better fit the curved sphincter tunnel or the bile duct tunnel, so that the incision knife can more easily pass through the sphincter tunnel or the bile duct tunnel.

Further, the incision knife further comprises a handle 41 and a finger ring 42 which is axially movably arranged on the handle 41, the handle 41 is connected with the proximal end of the knife tube assembly 10, the finger ring 42 is connected with the proximal end of the knife wire 20, the finger ring 42 is used for pulling the knife wire 20 so as to control the bending degree of the bending section 112, and the finger ring 42 is pulled to drive the knife wire 20 when the bending section 112 is bent, so that the papillary sphincter muscle of duodenum is cut and incised through the cutting edge of the knife wire 20. Preferably, the material of the multi-lumen tube 11 is a polymer compound material with moderate hardness and high elasticity, such as PTFE (polytetrafluoroethylene), so that the multi-lumen tube 11 can have better torque control performance while bending control is performed by pulling the cutter wire 20, and the handle 41 can be rotated to effectively drive the multi-lumen tube 11 to rotate integrally, thereby adjusting the orientation of the cutting edge of the cutter wire 20.

Referring to fig. 2, as well as fig. 6 and 7, the tip carrier 12 has a truncated cone shape, i.e. the diameter of the tip carrier 12 decreases gradually away from the multilumen tubing 11. The end head base 12 is sleeved on the distal end of the end head base 12 and the distal end of the multi-lumen tube 11, further, the expanding sleeve 30 includes an expanding portion 312 sleeved on the end head base 12 and a threaded portion 311 sleeved on the distal end of the multi-lumen tube 11, the expanding portion 312 is in a truncated cone shape, that is, the diameter of the end head base 12 gradually decreases towards the direction away from the multi-lumen tube 11, and the taper of the expanding portion 312 is matched with the taper of the end head base 12, so that the expanding portion 312 of the expanding sleeve 30 can be tightly attached to the end head base 12 after being sleeved on the end head base 12, the end head base 12 provides rigid support for the expanding portion 312, and the expanding sleeve 30 can more easily break through the narrow section of the sphincter channel or the bile duct channel by matching the truncated cone shape of the upper end head base 12 and the expanding portion 312.

Optionally, referring to fig. 4, the incision knife further includes a camera (not shown) and a wire harness 51 electrically connected to the camera, the multi-lumen tube 11 is further provided with a second lumen 102, the camera is disposed on the tip seat 12, preferably, the tip seat 12 is provided with a first mounting hole 122 penetrating through a distal end of the tip seat 12 and communicating with the second lumen 102, and the camera is disposed in the first mounting hole 122. The wire harness 51 is inserted into the second channel 102. The camera is used for acquireing the image in the patient's body, and pencil 51 is used for supplying power and data transmission for the camera, and further, the near-end of pencil 51 is used for being connected to the host computer to can show the image that the camera acquireed through the display screen of host computer, and then provide the operation field of vision for the doctor. Preferably, the visualization device further comprises a light source (not shown) disposed in the tip holder 12 and electrically connected to the wiring harness 51. Alternatively, the camera may be a CMOS image sensor, a CCD camera, and the light source may be an LED, an optical fiber, or the like.

Through setting up the camera in end headstock 12 to can send into the patient internal with the camera through sword pipe subassembly 10, in the ERCP art, the camera can acquire the image of direct-view duodenum nipple, thereby replaces traditional X-ray perspective's plane side view image, has reduced the degree of difficulty that instruments such as seal wire or incision sword were look for and are gone into the nipple, more is favorable to assisting the doctor to carry out the operation. And no radiation exists, so that the conflict between doctors and patients to ERCP is further reduced, and the popularization and the service of the ERCP are facilitated. Meanwhile, after fluoroscopy is not needed, the ERCP operation does not need to be carried out in a specific ERCP room, the ERCP operation can be carried out in a common diagnosis and treatment room, the waiting time of a patient is greatly reduced, and the mobility of a hospital bed is improved.

With continued reference to fig. 4 and 5, the multi-lumen tube 11 further defines a first instrument channel 103 penetrating through two ends thereof, the tip seat 12 defines a second instrument channel 121 penetrating through two ends thereof, the first instrument channel 103 is communicated with the second instrument channel 121, and preferably, the first instrument channel 103 and the second instrument channel 121 are concentrically disposed. Surgical instruments can be passed through the visualization device through the first instrument channel 103 and the second instrument channel 121 and perform surgical procedures with the assistance of the field of view provided by the visualization device. In particular, the surgical instrument includes, but is not limited to, one or more of a guidewire, a biopsy forceps, a laser fiber.

Further, referring to fig. 3, the distal end of the expanding sleeve 30 is provided with a avoiding opening 33, that is, the distal end of the threaded sleeve 30 is an open structure, and the avoiding opening 33 is communicated with the second instrument channel 121 and the first mounting hole 122, so as to ensure that the surgical instrument penetrating through the knife tube assembly 10 can penetrate through the distal end of the expanding sleeve, and simultaneously prevent the distal end of the expanding sleeve 30 from blocking the view of the camera.

Alternatively, in one of the embodiments, the thread structure 32 has an expanded state in which the thread structure 32 expands in a radial direction of the sheath body 31 to form an external thread, and a contracted state. In the contracted state, the thread structure 32 is contracted along the radial direction of the sheath body 31, so that when the cutting tube passes through the narrow section of the sphincter channel or the bile duct channel, the thread structure 32 is configured to be in the expanded state, the thread structure 32 can form external threads, and the expansion sleeve 30 can be driven to rotate by rotating the cutting tube assembly 10, so that the expansion sleeve 30 is assisted to pass through and stretch the narrow section of the sphincter channel or the bile duct channel, the narrow section of the sphincter channel or the bile duct channel is expanded, and the cutting tube assembly 10 behind the expansion sleeve 30 can conveniently pass through. When the operation is completed and the incision knife needs to be withdrawn, the thread structure 32 is configured to be in a contraction state, so that the thread structure 32 is radially contracted, the diameter of the expansion sleeve 30 is reduced, a doctor can directly withdraw the incision knife from the narrow section of the sphincter channel or the bile duct channel without reversely rotating the handle 41 or the knife tube assembly 10, the problem that the incision knife is slowly withdrawn and easily repeatedly contacts the channel wall when the incision knife reversely rotates is avoided, the operation experience of a patient with low tolerance is improved, and the operation speed is accelerated.

Optionally, referring to fig. 8 to 11, in one embodiment, the thread structure 32 includes a body 321 sleeved on the sheath 31 and an invertible portion 322 invertably connected to the body 321, in an expanded state, the invertible portion 322 protrudes from an outer circumferential surface of the body 321 along a radial direction of the body 321, and in a contracted state, the invertible portion 322 is attached to the outer circumferential surface of the sheath 31 or the outer circumferential surface of the body 321, so that the thread structure 32 can be switched between the expanded state and the contracted state by turning the invertible portion 322 in different directions.

Specifically, referring to fig. 8 and 9, in one embodiment, the incision knife further includes a sheath tube 60, and the sheath tube 60 is axially movably sleeved outside the knife tube assembly 10. Specifically, when the incision knife enters the narrow section or performs incision operation, the thread structure 32 is in the unfolded state, and at this time, the sheath tube 60 is sleeved outside the straight tube section 111 of the multi-cavity tube 11, so as to avoid covering the thread structure 32 and the cutting edge of the knife filament 20, when the incision knife needs to be withdrawn, the sheath tube 60 is driven to move towards the far end relative to the knife tube assembly 10 to be sleeved outside the expansion sleeve 30, and at this time, the sheath tube 60 abuts against the turnable part 322 and drives the turnable part 322 to be turned over to be tightly attached to the outer circumferential surface of the sleeve body 31, so that the thread structure 32 enters the contracted state, thereby reducing the diameter of the expansion sleeve 30, and facilitating withdrawal of the incision knife. In the next operation, the screw structure 32 can be re-deployed by merely toggling the reversible portion 322 of the screw structure 32 in the proximal direction before the incision knife is advanced. Preferably, in the present embodiment, the material of the thread structure 32 is silicone or latex, and the thread structure 32 forms an external thread in the expanded state by a predetermined property.

Referring to fig. 10 and 11, in another embodiment, one of the body 321 and the invertible portion includes an electromagnetic element, and the other includes a magnetically attractable element, wherein the electromagnetic element is used for attracting the magnetically attractable element to enable the invertible portion 322 to enter the retracted state, or the electromagnetic element releases the magnetically attractable element to enable the invertible portion 322 to enter the extended state. For example, the body 321 is an electromagnetic tape, the electromagnetic tape is spirally wound outside the sleeve 31, and the electromagnetic tape generates a magnetic field by passing electric energy. The turnable part 322 comprises an inner magnet and an elastic outer layer which is wrapped outside the magnet and can be connected with the electromagnetic band in a turnable way, the elastic outer layer can be made of silica gel or latex, when the incision knife enters a narrow section or is used for incision operation, the electromagnetic band is powered off, the electromagnetic band does not generate a magnetic field at the moment, and the turnable part 322 can be maintained in an unfolding state under the elastic action of the elastic outer layer. When the incision knife needs to be withdrawn, the electromagnetic band generates a magnetic field and adsorbs the turnable part 322 by electrifying the electromagnetic band, and the turnable part 322 is turned to be tightly attached to the outer peripheral surface of the electromagnetic band, so that the thread structure 32 enters a contraction state, the diameter of the expansion sleeve 30 is reduced, and the incision knife is convenient to withdraw. After the incision knife completely exits, the electromagnetic band is powered off again, so that the electromagnetic band releases the reversible part 322, and the reversible part 322 can be restored to the unfolded state to form the external thread.

It should be noted that the thread structure 32 may be switched between the deployed state and the retracted state by other means than the two ways of turning the thread structure, for example, the thread structure 32 may be an inflatable or fluid-filled air bag with a thread shape, and the thread structure 32 may be switched between the deployed state and the retracted state by inflating or fluid-filling the air bag to expand or contract the air bag.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Claims (12)

1. A cutting knife, comprising:

the outer peripheral surface of the cutter tube component is provided with an opening;

the cutter wire penetrates through the cutter tube assembly and is connected with the far end of the cutter tube assembly, and part of the cutter wire is exposed out of the cutter tube assembly through the opening to form a cutting edge for cutting; and the number of the first and second groups,

the expansion sleeve is arranged at the far end of the knife tube assembly, and a stretching structure is arranged on the peripheral surface of the expansion sleeve.

2. The incision knife of claim 1, wherein the distraction structure comprises a threaded structure disposed on an outer peripheral surface of the expansion sleeve; or, the distraction structure comprises a plurality of annular bulges which are sequentially arranged from the far end to the near end of the dilation sleeve, and the diameters of the annular bulges are sequentially increased from the far end to the near end of the dilation sleeve.

3. The incision knife of claim 2, wherein the dilation sleeve further comprises a sleeve body, the sleeve body is sleeved on the distal end of the knife tube assembly, and the dilation structure is disposed along a circumferential direction of the sleeve body.

4. The incision knife of claim 3, wherein the distraction structure has an expanded state in which the distraction structure is expanded in a radial direction of the sheath, and a contracted state; and in the contracted state, the propping structure is contracted along the radial direction of the sleeve body.

5. The incision knife according to claim 4, wherein the propping structure comprises a body disposed on the sheath and a turnable part connected to the body in a turnable manner, the turnable part protrudes from the outer peripheral surface of the body along the radial direction of the body in the expanded state, and the turnable part fits the outer peripheral surface of the sheath or the outer peripheral surface of the body in the contracted state.

6. The incision knife of claim 5, further comprising a sheath, wherein the sheath is axially movably sleeved outside the knife tube assembly, and when the sheath is moved distally relative to the knife tube assembly to be sleeved outside the expansion sleeve, the sheath drives the reversible portion to switch from the expanded state to the contracted state.

7. The incision knife of claim 5, wherein one of the body and the invertible portion comprises an electromagnetic element, and the other comprises a magnetically attractable element, wherein the electromagnetic element is used for attracting the magnetically attractable element to enable the invertible portion to enter the retracted state, or the electromagnetic element releases the magnetically attractable element to enable the invertible portion to enter the deployed state.

8. The incision knife of claim 1, wherein the knife tube assembly comprises a multi-lumen tube and an end socket connected to a distal end of the multi-lumen tube, the multi-lumen tube is provided with a first lumen, the opening is opened on an outer circumferential surface of the multi-lumen tube and communicated with the first lumen, and the knife wire is inserted into the first lumen and connected with the end socket.

9. The incision knife of claim 8, further comprising a camera and a wiring harness electrically connected to the camera, wherein the multi-lumen tube further comprises a second lumen, the camera is disposed on the tip seat, and the wiring harness is disposed through the second lumen.

10. The incision knife of claim 8, wherein the tip holder is cone frustum shaped, the expansion sleeve comprises an expansion portion sleeved on the tip holder and a threaded portion sleeved on the distal end of the multi-lumen tube, the expansion portion is cone frustum shaped, and the taper of the expansion portion matches the taper of the tip holder.

11. The incision knife of claim 8, further comprising a handle connected to the proximal end of the multi-lumen tube, and a finger ring axially movably disposed on the handle and connected to the proximal end of the blade, the finger ring configured to pull the blade.

12. The incision knife of claim 8, wherein the multilumen tubing further defines a first instrument channel extending through each end of the tubing, and the tip base defines a second instrument channel extending through each end of the tubing, the first instrument channel being in communication with the second instrument channel.

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