CN113426029A

CN113426029A - 3D prints an individual oral cavity section of thick bamboo for oral cancer radiotherapy

Info

Publication number: CN113426029A
Application number: CN202110568487.3A
Authority: CN
Inventors: 张成瑶; 龚靖淋; 汤喜; 张俊斌
Original assignee: Chongqing University Cancer Hospital
Current assignee: Chongqing University Cancer Hospital
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-09-24
Anticipated expiration: 2041-05-25
Also published as: CN113426029B

Abstract

The invention discloses an individualized oral cavity barrel for 3D printing radiotherapy of oral cancer, which structurally comprises a tooth isolating ring, an extension barrel and a tongue depressor, wherein the lower end of the tooth isolating ring is connected with the top of the extension barrel in a nested manner, the inside of the extension barrel is movably matched with the top end of the tongue depressor, the whole tongue depressor is in clearance fit with the lower end of the tooth isolating ring, the tooth isolating ring comprises a saliva guide groove, a saliva discharge hole and a hollow circular cavity, the inside of the saliva guide groove is movably matched with the inside of the saliva discharge hole, the whole saliva discharge hole is fixedly connected with the lower end of the hollow circular cavity, and the two sides of the hollow circular cavity are in clearance fit with the inner wall of the saliva guide groove. Meanwhile, the problem that saliva wraps a radiotherapy area is prevented, and the relative radiotherapy effect is improved.

Description

3D prints an individual oral cavity section of thick bamboo for oral cancer radiotherapy

Technical Field

The invention relates to the field of oral medical instruments, in particular to an individualized oral cavity barrel for 3D printing oral cancer radiotherapy.

Background

Radiotherapy is tumor radiotherapy for short, and can be divided into internal radiotherapy and external radiotherapy, wherein the internal radiotherapy is also called short-distance irradiation, and the internal radiotherapy of cavity organs such as oral cavity or cervical cancer, and the external radiotherapy is the commonly used long-distance irradiation, usually the most 'electric baking', and directly irradiates a tumor part to kill malignant tumors;

however, the prior art has the following defects: present 3D prints oral cavity cancer radiotherapy with individuation oral cavity section of thick bamboo, because need put into patient's oral cavity with an oral cavity section of thick bamboo and carry out the radiotherapy to cancer cell region in for saliva is excreted in the oral cavity is inside after putting into, and long time need clear up the saliva, thereby leads to the radiotherapy region to be wrapped up by its saliva, and then causes the radiotherapy effect to descend.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the individualized oral cavity barrel for 3D printing oral cancer radiotherapy, so as to solve the problem that in the prior art, the existing individualized oral cavity barrel for 3D printing oral cancer radiotherapy needs to be placed into the oral cavity of a patient to carry out radiotherapy on a cancer cell region, so that saliva is secreted in the oral cavity after the oral cavity is placed, and the saliva needs to be cleaned for a long time, so that the radiotherapy region is wrapped by the saliva of the radiotherapy region, and the radiotherapy effect is reduced.

In order to achieve the purpose, the invention is realized by the following technical scheme: 3D prints an individuation oral cavity section of thick bamboo for oral cancer radiotherapy, its structure is including separating the becket, extending a section of thick bamboo, tongue depressor, separate the becket lower extreme and extend a section of thick bamboo top nested connection, extend a section of thick bamboo inside and tongue depressor top clearance fit, the tongue depressor is whole with separating the becket lower extreme clearance fit, separate the becket and include saliva guide slot, row saliva hole, cavity circle chamber, the inside clearance fit of saliva guide slot and row saliva hole, row saliva hole is whole to be connected with cavity circle chamber lower extreme is inlayed admittedly, cavity circle chamber both sides and saliva guide slot inner wall clearance fit.

The saliva guide groove is further improved by comprising four liquid guide ports, a fixing plate, a tooth clamping groove and a cavity bottom plate, wherein the whole liquid guide ports are fixedly embedded and connected with the surface of the fixing plate, the inner wall of the fixing plate is connected with two ends of the tooth clamping groove in a clamping manner, the inner part of the tooth clamping groove is in clearance fit with the surface of the cavity bottom plate, the liquid guide ports are distributed on the surface of the fixing plate and fixedly embedded and connected with the surface of the fixing plate, and the inner side of each liquid guide port is in clearance fit with the surface of the cavity bottom plate.

The invention is further improved, the liquid guide port comprises a liquid discharge groove, a flow passage, a flow pipe and a cylinder wall, the bottom of the liquid discharge groove is movably matched with the top end of the flow passage, the lower wall of the flow passage is fixedly embedded and connected with the surface of the cylinder wall, the surface of the cylinder wall is integrally embedded and connected with the flow pipe, the interior of the flow pipe is integrally in clearance fit with the liquid discharge groove, the liquid discharge groove is distributed at the top of the flow passage and is embedded and connected with the top end of the flow passage, and the lower side of the liquid discharge groove is in clearance fit.

The invention is further improved, the lower liquid groove comprises an inner concave arc groove, a spiral blade, an inclined plate and a liquid inlet hole, two sides of the concave arc groove are movably matched with the surface of the spiral blade, the inner side of the spiral blade is fixedly connected with the surface of the liquid inlet hole, the surface of the liquid inlet hole is fixedly connected with the bottom of the inclined plate, two ends of the inclined plate are in clearance fit with the top of the spiral blade, the inclined plate is distributed on the surface of the liquid inlet hole and the top end of the spiral blade, and the lower liquid groove is integrally in an arc ladder shape.

The invention is further improved, the extension cylinder comprises a stretching sleeve, a sliding groove, a pulley and a blocking cover, wherein two sides of the stretching sleeve are in clearance fit with the inner wall of the blocking cover, the surface of the blocking cover is welded and connected with the top end of the pulley, the whole pulley is in sliding fit with the inside of the sliding groove, the blocking cover is distributed at the outer end of the stretching sleeve, and the pulley welded on the surface of two ends slides on the sliding groove.

The invention is further improved, the stretching sleeve comprises an elastic seat, a fixed cover plate, a first stretching block and a second sliding sleeve, the bottom of the elastic seat is fixedly embedded in the center of the surface of the fixed cover plate, the inside of the fixed cover plate is integrally embedded in the first stretching block, the first stretching block is integrally embedded in the second sliding sleeve, the elastic seat is distributed in the center of the fixed cover plate and fixedly embedded in the surface of the fixed cover plate, and the elastic seat is rectangular.

The elastic seat is further improved by comprising an elastic cushion, an anti-falling adhesive tape, a glue clamping groove and a stress block, wherein the elastic cushion is in clearance fit with the inner surface of the anti-falling adhesive tape in a whole, two ends of the anti-falling adhesive tape are fixedly embedded in the glue clamping groove, the glue clamping groove is in fixation connection with two ends of the stress block in a whole, the surface of the stress block is in clearance fit with the anti-falling adhesive tape in a whole, the anti-falling adhesive tape is in an arc strip shape in a whole, two ends of the anti-falling adhesive tape are fixedly embedded in the glue clamping groove, and the inner surface of the stress block is in clearance fit with the surface of the stress block.

The elastic cushion is further improved by comprising a pressure carrying plate, a fixed groove, a hook spring and an inner concave plate groove, wherein the surface of the pressure carrying plate is integrally embedded and connected with the fixed groove, the lower end of the fixed groove is in clearance fit with the surface of the inner concave plate groove, the inner part of the inner concave plate groove is integrally embedded and connected with the hook spring, the top of the hook spring is embedded and connected with the lower surface of the pressure carrying plate, the pressure carrying plate is distributed at the upper end of the inner concave plate groove, and the lower surface of the pressure carrying plate is embedded and connected with the top of the hook spring.

Advantageous effects

Compared with the prior art, the invention has the following beneficial effects;

1. the invention strengthens the stability of the oral cavity cylinder in the cavity through the clamping and pressing groove, simultaneously, the saliva secreted in the oral cavity is matched with the liquid guide ports on the two sides to flow into the liquid inlet hole from the inclined plate, flows to the surface of the circulating pipe along the flow passage and is finally discharged from the saliva discharge hole, thereby effectively solving the problem that the saliva secreted in the oral cavity needs to be cleaned frequently, simultaneously preventing the saliva from wrapping a radiotherapy area and improving the relative radiotherapy effect.

2. The tongue depressor fixed on the surface of the pressure carrying plate is prevented from being separated and limited by the anti-falling rubber strip in the elastic seat, and meanwhile, under the matching of the hook spring at the lower end, the tongue depressor can swing up and down in an effective interval, so that the phenomenon that the original fixed tongue depressor oppresses the tongue for a long time to cause paralysis of the tongue is prevented, and the problem that the tongue is paralyzed under the oppression of the tongue depressor for a long time is solved.

Drawings

Fig. 1 is a schematic structural diagram of an individualized oral cavity barrel for 3D printing oral cancer radiotherapy of the present invention.

Fig. 2 is a front view of the tooth separating ring of the present invention.

Fig. 3 is a schematic top view of a saliva guide channel according to the invention.

FIG. 4 is a schematic front view of a liquid guiding port according to the present invention.

FIG. 5 is a schematic top view of the lower liquid tank of the present invention.

Fig. 6 is a schematic view of the internal structure of the extension cylinder of the present invention.

Fig. 7 is a schematic view of the internal structure of the extension cylinder of the present invention.

Fig. 8 is a schematic perspective view of the elastic base of the present invention.

FIG. 9 is a schematic view of the internal structure of the elastic cushion of the present invention.

In the figure: tooth separating ring-1, extending cylinder-2, tongue depressor-3, saliva guide groove-11, saliva discharging hole-12, hollow round cavity-13, liquid guide port-111, fixing plate-112, tooth clamping groove-113, cavity bottom plate-114, lower liquid groove-a 1, flow channel-a 2, flow channel-a 3, cylinder wall-a 4, concave arc groove-a 11, spiral blade-a 12, inclined plate-a 13, liquid inlet hole-a 14, stretching sleeve-21, sliding groove-22, pulley-23, blocking cover-24, elastic seat-211, fixing plate-212, first extending block-213, second sliding sleeve-214, elastic pad-b 1, anti-drop rubber strip-b 2, rubber clamping groove-b 3, stress block-b 4, pressure carrying plate-b 11, fixing groove-b 56, 12, A hook spring-b 13 and an inner concave plate groove-b 14.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

The invention is further described below with reference to the accompanying drawings:

example 1

As shown in figures 1 to 5:

its structure includes separates the becket 1, extends a section of thick bamboo 2, tongue depressor 3, separate 1 lower extreme of becket and extend 2 top nested connection of a section of thick bamboo, extend 2 inside and 3 top clearance fits of tongue depressor of a section of thick bamboo, 3 whole and separate 1 lower extreme clearance fit of becket, separate becket 1 including saliva guide slot 11, saliva discharge hole 12, cavity circle chamber 13, saliva guide slot 11 inside with saliva discharge hole 12 inside clearance fit, saliva discharge hole 12 is whole to be connected with 13 lower extremes of cavity circle chamber in an embedded solid mode, 13 both sides of cavity circle chamber and 11 inner wall clearance fit of saliva guide slot.

Wherein, saliva guide slot 11 includes drain port 111, fixed plate 112, card tooth socket 113, chamber bottom plate 114, drain port 111 is whole to be connected with fixed plate 112 surface embedment, fixed plate 112 inner wall is connected with card tooth socket 113 both ends block, 113 inside and the 114 surperficial clearance fit of chamber bottom plate of card tooth socket, drain port 111 is equipped with four, distributes on fixed plate 112 surface, rather than the surface embedment connection, and inboard and the 114 surperficial clearance fit that forms of chamber bottom plate, wherein card tooth socket 113 is favorable to going into the tooth card of therapentic person wherein, avoids droing of whole equipment, also can play good stability to equipment simultaneously.

The liquid guide port 111 comprises a lower liquid groove a1, a flow channel a2, a flow pipe a3 and a cylinder wall a4, the bottom of the lower liquid groove a1 is movably matched with the top end of the flow channel a2, the lower wall of the flow channel a2 is fixedly embedded with the surface of the cylinder wall a4, the surface of the cylinder wall a4 is integrally nested and connected with a flow pipe a3, the inside of the flow pipe a3 is integrally clearance-matched with the lower liquid groove a1, the lower liquid groove a1 is distributed at the top of the flow channel a2 and is nested and connected with the top end of the flow channel a1, and the lower side of the flow pipe a3 is clearance-matched with the surface of the flow pipe a3, wherein the flow pipe a3 is favorable for guiding the collected secreted saliva and avoiding excessive saliva in the oral cavity of the patient from influencing the radiotherapy effect.

The lower liquid groove a1 comprises an inner concave arc groove a11, a spiral blade a12, an inclined plate a13 and a liquid inlet hole a14, wherein two sides of the concave arc groove a11 are movably matched with the surface of the spiral blade a12, the inner side of the spiral blade a12 is fixedly connected with the surface of the liquid inlet hole a14, the surface of the liquid inlet hole a14 is fixedly connected with the bottom of the inclined plate a13, two ends of the inclined plate a13 are in clearance fit with the top of the spiral blade a12, the inclined plate a13 is distributed on the surface of the liquid inlet hole a14 and the top end of the spiral blade a12 and is integrally in an arc ladder shape, the inclined plate a13 is beneficial to guiding saliva secreted by a generated inclination angle, the spiral blade a12 on two sides is matched with the inner concave arc groove a11 to block the saliva entering into the liquid inlet hole a14, and the downstream speed of the saliva is increased.

The specific working principle is as follows:

the invention makes the extension tube 2 and the tongue depressor 3 put into the mouth of the patient by pressing the tooth separating ring 1 against the upper and lower lips of the patient, provides the operation space for the doctor through the hollow round cavity 13 formed inside, the saliva guide grooves 11 on both sides guide the saliva secreted in the mouth, then the guide tube is inserted from the saliva discharge hole 12 to guide out, after the teeth of the patient are clamped into the tooth clamping groove 113, the stability of the mouth tube is increased, the displacement in the cavity is prevented, simultaneously the liquid guide ports 111 on both sides are fixed through the fixing plate 112, the guide is carried out by matching with the flow tube a3 on the upper end of the cylinder wall a4 at the bottom of the cavity bottom plate 114, so the saliva enters from the lower flow groove a1 on both sides, for the convenience of entering, the lower inclined plate a13 is used as the guide plate, the flow guide and overflow prevention of the spiral blade a12 and the concave arc groove a11 which are higher by five millimeters on both sides are matched, finally the saliva is guided into the flow channel a2 from the surface of the liquid inlet hole 14 to flow outwards, the oral cavity tube strengthens the stability of the oral cavity tube in a cavity through the clamping and pressing groove 113, simultaneously is matched with the liquid guide ports 111 at two sides to enable saliva secreted in the oral cavity to flow into the liquid inlet hole a14 from the inclined plate a13, flow to the surface of the flow pipe a3 along the flow passage a2 and finally be discharged from the saliva discharge hole 12, the problem that the saliva secreted in the oral cavity needs to be cleaned frequently is effectively solved, meanwhile, the problem that the saliva wraps a radiotherapy area is also prevented, and the effect of the radiotherapy is improved relatively.

Example 2:

as shown in fig. 6 to 9:

wherein, it includes tensile cover 21, spout 22, pulley 23, stops cover 24 to extend a section of thick bamboo 2, tensile cover 21 both sides and 24 inner wall clearance fit of stop cover, stop cover 24 surface and 23 top welded connections of pulley, the whole and the inside sliding fit of spout 22 of pulley 23, stop cover 24 and distribute in tensile cover 21 outer end, slide on spout 22 through both ends surface welded pulley 23, wherein stop cover 24 and be favorable to adjusting patient's oral cavity length and cage cover, avoid equipment to use every human body parameter not uniform and cause oral cavity section of thick bamboo equipment distance not enough.

The stretching sleeve 21 comprises an elastic seat 211, a fixed cover plate 212, a first extending block 213 and a second sliding sleeve 214, the bottom of the elastic seat 211 is fixedly embedded in the center of the surface of the fixed cover plate 212, the inside of the fixed cover plate 212 is integrally embedded in the first extending block 213, the first extending block 213 is integrally embedded in the second sliding sleeve 214, the elastic seat 211 is distributed in the center of the fixed cover plate 212 and fixedly embedded in the surface of the fixed cover plate 212, the elastic seat 211 is rectangular, and the elastic seat 211 is beneficial to fixing the tongue depressor and prevents the tongue depressor from being paralyzed due to long-term tongue compression.

The elastic seat 211 comprises an elastic cushion b1, an anti-falling rubber strip b2, a rubber clamping groove b3 and a stress block b4, the elastic cushion b1 is in clearance fit with the inner surface of the anti-falling rubber strip b2, two ends of the anti-falling rubber strip b2 are fixedly connected with the inside of the rubber clamping groove b3, the rubber clamping groove b3 is fixedly connected with two ends of the stress block b4, the surface of the stress block b4 is in clearance fit with the whole of the anti-falling rubber strip b2, the anti-falling rubber strip b2 is in an arc-shaped strip shape, two ends of the anti-falling rubber strip b3 are fixedly connected with the inside of the rubber clamping groove b3, the inner surface of the stress block b4 is in clearance fit, the rubber clamping groove b3 is favorable for fixedly connecting the anti-falling rubber strip b2, and the over-large vertical swing amplitude of the tongue depressor the anti-falling rubber strip is prevented from being operated in the hollow round cavity 13 by a doctor.

The elastic pad b1 comprises a pressure-bearing plate b11, a fixing groove b12, a hook spring b13 and an inner concave plate groove b14, wherein the surface of the pressure-bearing plate b11 is integrally embedded and connected with the fixing groove b12, the lower end of the fixing groove b12 is in clearance fit with the surface of the inner concave plate groove b14, the inner part of the inner concave plate groove b14 is integrally embedded and connected with the hook spring b13, the top of the hook spring b13 is embedded and connected with the lower surface of the pressure-bearing plate b11, the pressure-bearing plate b11 is distributed at the upper end of the inner concave plate groove b14, and the lower surface of the inner concave plate groove b14 is embedded and connected with the top of the hook spring b13, wherein the hook spring b13 is favorable for buffering and restoring of the tongue depressor, provides a moving space for the tongue depressor, and avoids long-term tongue depression of the plate body.

The specific working principle is as follows:

the extension tube 2 is put into a cavity of a patient, when the distance needs to be adjusted, the extension tube can slide and extend in the sliding groove 22 by pushing the blocking cover 24 under the matching of the pulleys 23 at two sides, the tongue depressor 3 is fixed by the elastic seat 211 in the middle extension sleeve 21, the top end of the tongue depressor 3 and the surface of the fixed groove b12 are fixed on the surface of the pressure-carrying plate b11 by bolts, the bottom part of the tongue depressor 3 is matched and embedded in the center of the inner concave plate b14 by the hook spring b13 to buffer the stress of the tongue depressor 3, and the first extension block 213 and the second sliding sleeve 214 can also extend the tongue depressor in an auxiliary way when the distance of the tongue depressor 3 is not enough, the elastic seat 211 fixed in the center of the fixed cover plate 212 fixes two ends of the anti-falling rubber strip b12 by the rubber clamping grooves b3 at two sides, and the stress block b4 is embedded in the surface of the fixed cover plate 212, the tongue depressor 3 fixed on the surface of the pressure-carrying plate b11 is prevented from being separated and limited by the rubber strip 2 in the elastic seat 211, meanwhile, under the matching of the lower hook spring b13, the tongue depressor 3 can swing up and down in an effective interval, so that the phenomenon that the tongue is paralyzed due to the fact that the original fixed tongue depressor oppresses the tongue for a long time is prevented, and the problem that the tongue is paralyzed under the oppression of the tongue depressor 3 for a long time is effectively solved.

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 present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein; any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

The 3D prints an individual oral cavity section of thick bamboo for oral cancer radiotherapy, its structure is including separating tooth ring (1), extending a section of thick bamboo (2), tongue depressor (3), separate tooth ring (1) lower extreme and extend a section of thick bamboo (2) top nested connection, extend a section of thick bamboo (2) inside and tongue depressor (3) top clearance fit, tongue depressor (3) whole with separate tooth ring (1) lower extreme clearance fit, its characterized in that:

separate ring for teeth (1) including saliva guide slot (11), saliva hole (12), cavity circle chamber (13), saliva guide slot (11) inside with saliva hole (12) inside clearance fit, saliva hole (12) are whole to be connected with cavity circle chamber (13) lower extreme is embedded admittedly, cavity circle chamber (13) both sides and saliva guide slot (11) inner wall clearance fit.
2. The 3D printing individualized oral cavity barrel for oral cancer radiotherapy of claim 1, wherein: saliva guide slot (11) are including drain mouth (111), fixed plate (112), card tooth groove (113), chamber bottom plate (114), drain mouth (111) is whole to be connected with fixed plate (112) surface embedment, fixed plate (112) inner wall is connected with card tooth groove (113) both ends block, card tooth groove (113) inside and chamber bottom plate (114) surface clearance fit.
3. The 3D printing individualized oral cavity barrel for oral cancer radiotherapy of claim 2, wherein: the liquid guide port (111) comprises a liquid discharge groove (a 1), a flow channel (a 2), a flow pipe (a 3) and a cylinder wall (a 4), the bottom of the liquid discharge groove (a 1) is movably matched with the top end of the flow channel (a 2), the lower wall of the flow channel (a 2) is fixedly embedded and connected with the surface of the cylinder wall (a 4), the surface of the cylinder wall (a 4) is integrally embedded and connected with the flow pipe (a 3), and the interior of the flow pipe (a 3) is in integral clearance fit with the liquid discharge groove (a 1).
4. The 3D printing individualized oral cavity barrel for oral cancer radiotherapy of claim 3, wherein: lower cistern (a 1) is including concave arc groove (a 11), spiral leaf (a 12), hang plate (a 13), feed liquor hole (a 14), concave arc groove (a 11) both sides and spiral leaf (a 12) surface clearance fit, spiral leaf (a 12) inboard is connected with feed liquor hole (a 14) surface embedment, feed liquor hole (a 14) surface is connected with hang plate (a 13) bottom embedment, hang plate (a 13) both ends and spiral leaf (a 12) top clearance fit.
5. The 3D printing individualized oral cavity barrel for oral cancer radiotherapy of claim 1, wherein: extend a section of thick bamboo (2) including tensile cover (21), spout (22), pulley (23), stop cover (24), tensile cover (21) both sides and stop cover (24) inner wall clearance fit, stop cover (24) surface and pulley (23) top welded connection, pulley (23) whole and spout (22) inside sliding fit.
6. The 3D printing individualized oral cavity barrel for oral cancer radiotherapy of claim 5, wherein: tensile cover (21) are including elasticity seat (211), fixed cover plate (212), first stretch piece (213), second sliding sleeve (214), elasticity seat (211) bottom is embedded with fixed cover plate (212) surface center and is connected, fixed cover plate (212) inside with first stretch piece (213) whole nested connection, first stretch piece (213) whole and second sliding sleeve (214) nested connection.
7. The 3D printing individualized oral cavity barrel for oral cancer radiotherapy of claim 6, wherein: elasticity seat (211) include elasticity pad (b 1), anticreep adhesive tape (b 2), glue draw-in groove (b 3), atress piece (b 4), elasticity pad (b 1) is whole with anticreep adhesive tape (b 2) internal surface clearance fit, anticreep adhesive tape (b 2) both ends are connected with the inside solid of inlaying of glue draw-in groove (b 3), glue draw-in groove (b 3) is whole to be connected with the both ends solid of atress piece (b 4) are inlayed, atress piece (b 4) surface and the whole clearance fit of anticreep adhesive tape (b 2).
8. The 3D printing individualized oral cavity barrel for radiotherapy of oral cancer according to claim 7, wherein: the elastic pad (b 1) is including carrying clamp plate (b 11), fixed slot (b 12), couple spring (b 13), interior concave plate groove (b 14), carry clamp plate (b 11) surface and fixed slot (b 12) whole to inlay solid and be connected, fixed slot (b 12) lower extreme and interior concave plate groove (b 14) surface clearance fit, interior concave plate groove (b 14) is inside to be connected with couple spring (b 13) whole to inlay solid, couple spring (b 13) top and carry clamp plate (b 11) lower surface to inlay solid and be connected.