Gun type tendon taking device

Abstract

The invention relates to the field of medical instruments, and particularly discloses a gun type tendon taking device which comprises a base body and a cutting mechanism arranged at one end of the base body. The cutting mechanism comprises a mounting block, and a through hole is formed in the mounting block; the silk thread is arranged on the mounting block in a sliding manner, so that the tendon penetrating through the through hole can be cut off when the silk thread slides; and the connecting assembly comprises connecting parts arranged at the two ends of the silk thread, each connecting part comprises a mounting seat, a first elastic part, a guide wheel and a connecting rope, the mounting seats are connected to the ends of the silk thread, the mounting seats are arranged on the mounting blocks in a sliding mode, and the first elastic parts are fixedly connected between the mounting seats and the mounting blocks. In the process that the tendon taking device stretches into a knee incision of a patient or is taken out outwards, the tendon is not prone to being scratched by the silk threads, and the integrity of the tendon can be guaranteed; in addition, the silk thread can cut along the cross section of the tendon, the cutting face generated in the mode is smooth, and follow-up sewing and fixing are facilitated.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a gun-type tendon remover. Background Art

[0002] In patients with clinical orthopedic sports injuries or violent car accident injuries, the violence causes the knee joint to twist, generating huge shear and tensile forces, resulting in single or multiple ligament ruptures in the knee joint, such as: anterior and posterior cruciate ligament rupture, medial and lateral collateral ligament rupture, and patellar tendon rupture. All of the above injuries require autologous or allogeneic tendon transplantation surgery to reconstruct the continuity of the ligament or tendon.

[0003] ACL (Anterior Cruciate Ligament) and PCL (Posterior Cruciate Ligament) reconstruction surgeries are surgeries used to repair damaged cruciate ligaments in the knee joint. During ACL (Anterior Cruciate Ligament) or PCL (Posterior Cruciate Ligament) reconstruction surgery, autologous tendons such as hamstring tendons, quadriceps tendons, etc. need to be harvested. A tendon harvester is required to harvest the tendons. The tendons are cut off by the tendon harvester, and then the cut tendons are constructed into the grafts required for ligament reconstruction, which are then implanted into the patient's body.

[0004] In the related art, a Chinese patent with publication number CN115666407A discloses a system for harvesting tendon grafts, the technical key points of which are: including a retractor, a guide and a harvesting tool. The retractor is retractable and, when released, becomes self-supporting to keep the anatomical space formed above the tendon in the patient's body open. The guide is assembled with the retractor to orient the guide axis along the retractor, thereby orienting the anatomical space. The harvesting tool includes a working end having a blade edge for cutting into the tendon. The harvesting tool defines a contour surface for engaging and translating along the guide axis when assembled to the retractor. The guide axis and the contour surface limit the trajectory and translation range of the harvesting tool along and into the tendon. It also includes a proximal cutter, which is constructed to extend along the working cavity and transversely cut the tendon graft.

[0005] When the proximal cutter in the above scheme cuts the tendon, it is necessary to pass the end of the tendon through the hole on the blade at the end of the shaft of the proximal cutter, and then slide the proximal cutter so that the blade slides into the incision of the patient's knee for a certain distance, and then hold the handle and squeeze the lever to slide the pull rod outward, and the pull rod drives the blade to slide, thereby cutting the tendon in the blade. Since the edge of the hole on the blade is provided with a sharp edge, when the blade is misoperated during the process of sliding the blade into the incision of the patient's knee, when the blade needs to be pulled out, the sharp edge on the blade is easy to scratch the tendon, affecting the integrity of the tendon and being unfavorable to the subsequent reconstruction of the graft. Summary of the invention

[0006] In order to reduce the possibility of damage to the tendon during the process of obtaining the tendon, the present application provides a gun-type tendon remover.

[0007] The present application provides a gun-type tendon extractor that adopts the following technical solution: A gun-type tendon extractor, comprising: A base body, the base body comprising a hollow tube and a movable rod, the movable rod being coaxially slidably disposed in the hollow tube; A cutting mechanism, the cutting mechanism is arranged at one end of the base body, and the cutting mechanism comprises: A mounting block is fixedly mounted on one end of the hollow tube, the mounting block is provided with a through hole for the tendon to pass through, and the axis of the through hole is parallel to the axis of the hollow tube; A silk thread, wherein the length direction of the silk thread is perpendicular to the axis of the hollow tube, and the silk thread is slidably arranged on the mounting block along the radial direction of the perforation, so that the tendon passing through the perforation can be cut off when the silk thread slides; The connecting assembly includes connecting parts arranged at both ends of the wire, the connecting parts include a mounting seat, a first elastic member, a guide wheel and a connecting rope, the mounting seat is connected to the end of the wire, the mounting seat is radially slidably arranged on the mounting block along the through hole, the first elastic member is fixedly connected between the mounting seat and the mounting block, the guide wheel is rotatably arranged on the mounting block, the connecting rope is wound around the guide wheel, one end of the connecting rope is arranged along the sliding direction of the mounting seat and fixedly connected to the mounting seat, and the other end of the connecting rope is arranged along the axial direction of the hollow tube and fixedly connected to the movable rod.

[0008] By adopting the above technical solution, after one end of the tendon is passed through the perforation on the mounting block, the hollow tube is slid into the incision of the patient's knee for a distance, and then the movable rod is pulled outward. The movable rod can drive the mounting seat to slide through the connecting rope, thereby driving the silk thread to slide through the mounting seat. Since the diameter of the silk thread is relatively thin, the sliding silk thread can cut off the tendon in the perforation, thereby realizing the rapid removal of the tendon; since the silk thread is located on the side of the mounting block away from the incision of the patient's knee, the silk thread is not easy to scratch the tendon during the sliding process of the hollow tube, which helps to ensure the integrity of the tendon; In addition, after the hollow tube is inserted into the incision in the patient's knee, the patient's tendon is parallel to the hollow tube, and the sliding direction of the silk thread is perpendicular to the axis of the hollow tube, so the silk thread can be cut along the cross-section of the tendon. The cutting surface produced by this method is relatively smooth, which is conducive to subsequent suturing and fixation, and can also provide a better contact area, which is conducive to the healing of the tendon and the bone tunnel; in addition, transverse cutting can reduce the rotation of the tendon during fixation, thereby improving stability; while the blade in the proximal cutter in the scheme mentioned in the background technology is approximately parallel to the tendon, so that the tendon is cut along an oblique direction. This method easily makes it difficult to align the two ends of the tendon, increasing the difficulty of suturing and fixation; therefore, the transverse cutting method of the present application is more conducive to subsequent treatment than the oblique cutting method in the scheme of the background technology.

[0009] Optionally, the mounting seat includes two support blocks and a winding roller rotatably arranged between the two support blocks, the two ends of the wire are respectively fixedly connected to the two winding rollers, and the mounting block is provided with a rotating component for driving the winding roller to rotate, and the rotating component is provided with two groups and corresponds to the two winding rollers respectively, and the rotating component includes a first rack and a gear, the first rack is fixedly connected to the mounting block along the sliding direction of the mounting seat, and the gear is coaxially fixedly connected to the winding roller, and the gear is used to mesh with the first rack.

[0010] By adopting the above technical scheme, under the meshing action of the first rack and the gear, the winding roller can rotate while sliding. When the winding roller rotates, one end of the silk thread is wound up and the other end of the silk thread is unfolded. Therefore, in the process of the silk thread sliding along the radial direction of the perforation, the silk thread can also slide along its own length direction. With the cooperation of the two sliding modes, it helps to enhance the cutting effect on the tendon, making the cutting surface of the tendon smoother, which is helpful for the subsequent preparation of tendon grafts. In addition, since the gear is in a meshing state with the first rack, the gears at both ends of the silk thread keep rotating synchronously in the process of the silk thread sliding along the radial direction of the perforation, so that the silk thread is always in a straight state, and the silk thread is not easy to relax, which helps to ensure the cutting effect of the silk thread on the tendon.

[0011] Optionally, a support block is slidably arranged on the mounting block along the radial direction of the through hole, the support block is slidably arranged on the support block, and a fixing piece for fixing the support block on the support block is arranged between the support block and the support block.

[0012] By adopting the above technical solution, after the tendon is cut, the sliding support block can make the winding roller slide, so that the gear on the winding roller disengages from the first rack. At this time, it is convenient to unfold and disinfect the silk thread wound on the winding roller, which helps to enhance the disinfection effect of the silk thread and reduce the growth of bacteria.

[0013] Optionally, a first torsion spring is arranged between the winding roller and the support block.

[0014] By adopting the above technical solution, after the silk thread is unwound from the winding roller and the silk thread is sterilized, the silk thread is loosened. Under the action of the first torsion springs at both ends of the silk thread, the silk thread can be automatically tensioned, making the subsequent operation of fixing the mounting base on the support plate easier.

[0015] Optionally, the teeth on the first rack are provided with multiple sections and are evenly spaced.

[0016] By adopting the above technical solution, in the initial state, the silk thread is in a stationary state, and the first torsion spring is at its original length; as the silk thread slides down, the gear meshes with the first rack, and the winding roller can rotate while sliding, and the first torsion spring is twisted; when the gear slides to a section where no teeth are set, the gear disengages from the first rack, and at this time, under the action of the first torsion spring, the winding roller can rotate in the opposite direction; then as the silk thread slides down, the above process can be repeated, that is, the winding roller rotates forward and reverse alternately, so that the silk thread can slide back and forth along its own length direction, thereby further enhancing the cutting effect of the silk thread on the tendon; since the silk thread can slide back and forth, the part of the silk thread wound on the winding roller can be shortened, thereby further reducing the possibility of bacteria breeding in the silk thread wound on the winding roller, thereby improving safety.

[0017] Optionally, a second rack is fixedly connected to the mounting block, the second rack is parallel to the first rack, two second racks are provided corresponding to the two first racks respectively, the teeth on the second rack are provided with multiple sections and are arranged at even intervals, the teeth on the second rack and the first rack are facing the side close to each other, and the teeth on the second rack and the first rack are respectively used to mesh with the two sides of the gear.

[0018] By adopting the above technical solution, when the gear and the first rack are meshed, the gear rotates in one direction, and when the gear and the second rack are meshed, the gear rotates in the other direction. Therefore, as the wire slides down, the gear can be rotated forward and reversed, so that the wire can slide back and forth along its own length, thereby enhancing the cutting effect on the tendon; in addition, since there are two racks corresponding to each gear, and the two racks are respectively located on both sides of the gear, the teeth on the two racks are complementary, so that the gear is always meshed with one of the racks during the sliding process, so that the wire is always in a straight state, and the wire is not easy to relax, which helps to ensure the cutting effect on the tendon.

[0019] Optionally, a protective shell is movably connected to the mounting block, and the protective shell cover is arranged on the outside of the cutting mechanism.

[0020] By adopting the above technical scheme, the protective shell can protect the cutting mechanism, thereby extending the service life of the cutting mechanism; in addition, the protective shell cover is placed on the outside of the cutting mechanism before the tendon removal operation. When the tendon removal operation is performed, the silk thread is located inside the protective shell, making it difficult for the silk thread to contact the tendon, thereby further reducing the possibility of the tendon being scratched by the silk thread during the sliding of the tendon remover.

[0021] Optionally, a driving assembly is provided at one end of the hollow tube away from the cutting mechanism, and the driving assembly includes a handle, a rotating handle and a second elastic member. The handle is fixedly connected to the end of the hollow tube, and the rotating handle is rotatably connected to the handle. A sliding groove is provided on the rotating handle. The end of the movable rod is fixedly connected to a limiting rod, and the limiting rod is slidably arranged in the sliding groove so that the movable rod can be driven to slide by the limiting rod when the rotating handle rotates. The second elastic member is arranged between the handle and the rotating handle so that the rotating handle has a tendency to rotate toward a side away from the handle.

[0022] By adopting the above technical solution, the handle is held and the rotating handle is squeezed so that the rotating handle rotates toward the side close to the handle. When the rotating handle rotates, the movable rod can be driven to slide through the limit rod, thereby driving the silk thread to slide, thereby realizing the cutting of the tendon, and the operation is more convenient; after the tendon is cut, the rotating handle is released, and under the action of the second elastic member, the rotating handle can be rotated toward the side away from the handle, thereby realizing the resetting of the rotating handle and the movable rod.

[0023] Optionally, a self-locking component is arranged between the handle and the rotating handle, and the self-locking component includes a trigger, a block, a ratchet and a second torsion spring. The trigger is rotatably arranged on the handle, the block is fixedly connected to the trigger, the ratchet is fixedly connected to the rotating handle, the axis of the ratchet and the rotation axis of the rotating handle are coaxially arranged, and the second torsion spring is fixedly connected between the trigger and the handle to make the block press tightly against the ratchet.

[0024] By adopting the above technical solution, when the hollow tube is slid into the incision of the patient's knee, the operator holds the grip handle and the rotating handle. During this process, the block is pressed against the ratchet, thereby limiting the rotation of the rotating handle, thereby preventing the movable rod from accidentally sliding and causing accidental injury to the tendon, which helps to ensure the integrity of the tendon.

[0025] Optionally, scale lines are provided on the hollow tube.

[0026] By adopting the above technical solution, it is convenient to cut the tendon of the required length to meet the treatment needs.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. The silk thread is located on the side of the mounting block away from the patient's knee incision. Therefore, when the hollow tube and the cutting mechanism are inserted into the patient's knee incision or taken out, the silk thread is not easy to scratch the tendon, which helps to ensure the integrity of the tendon and facilitates the subsequent production of tendon grafts.

[0028] 2. While the silk thread slides along the radial direction of the perforation, it can also slide along its own length direction. The coordination of the two sliding movements helps to enhance the cutting effect on the tendon, making the cut section on the tendon smoother, which is helpful for subsequent suturing and healing.

[0029] 3. Since there are two racks corresponding to each gear, the gears can alternately rotate forward and reverse during the downward movement, so that the wire can slide back and forth while moving downward, further enhancing the cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 is a schematic diagram of the overall structure of Embodiment 1 of the present application from another perspective; Figure 3 is a cross-sectional view of Example 1 of the present application; Figure 4 This is a schematic diagram of the structure of Example 1 of the present application without the protective shell; Figure 5 yes Figure 4 The enlarged schematic diagram of point A in the middle; Figure 6 This is a schematic diagram of the structure of the connection assembly used in Example 1 of the present application; Figure 7 It is a structural diagram of Example 2 of the present application.

[0031] 1. base; 11. hollow tube; 111. graduation mark; 12. movable rod; 121. limit rod; 2. cutting mechanism; 21. mounting block; 211. perforation; 212. limit groove; 22. silk thread; 23. connecting assembly; 231. mounting seat; 2311. support block; 2312. winding roller; 232. first elastic member; 233. guide wheel; 234. connecting rope; 3. rotating assembly; 31. first rack; 32. gear; 4. supporting block; 41. slot; 5. plug rod; 6. first torsion spring; 7. second rack; 8. protective shell; 9. driving assembly; 91. handle; 92. rotating handle; 921. slide groove; 93. second elastic member; 10. self-locking assembly; 101. trigger; 102. block; 103. ratchet; 13. connecting rod. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-7This application is described in further detail.

[0033] Example 1 The present application embodiment discloses a gun-type tendon extractor. Figure 1 , Figure 2 and Figure 3 The gun-type tendon extractor comprises a base 1 and a cutting mechanism 2 arranged at one end of the base 1. The base 1 comprises a hollow tube 11 and a movable rod 12. A scale line 111 is arranged on the outer wall of the hollow tube 11 to facilitate checking the length of the tendon to be removed; the movable rod 12 is coaxially slidably penetrated in the hollow tube 11. One end of the movable rod 12 is connected to the cutting mechanism 2, and the other end of the movable rod 12 is connected to a driving assembly 9 for driving the movable rod 12 to slide.

[0034] Reference Figure 2 and Figure 3 The driving assembly 9 includes a handle 91, a rotating handle 92 and a second elastic member 93. The handle 91 is fixedly connected to the outer wall of the hollow tube 11 at one end away from the cutting mechanism 2, and the rotating handle 92 is hinged on the handle 91, and the hinge axis between the rotating handle 92 and the handle 91 is perpendicular to the axis of the hollow tube 11. A slide groove 921 is provided on the rotating handle 92, and the slide groove 921 is a strip groove; the end of the movable rod 12 away from the cutting mechanism 2 is fixedly connected to the limiting rod 121, and the axis of the limiting rod 121 is parallel to the rotation axis of the rotating handle 92; the limiting rod 121 is inserted into the slide groove 921, and the limiting rod 121 can slide along the length direction of the slide groove 921. Therefore, by pinching the rotating handle 92 and rotating the rotating handle 92 toward the side close to the handle 91, the movable rod 12 can be driven to slide toward the side away from the cutting mechanism 2 through the limiting rod 121. The second elastic member 93 is a metal spring sheet, and two metal spring sheets are provided and fixedly connected to the side of the handle 91 and the rotating handle 92 that are close to each other. The ends of the two metal spring sheets are pressed against each other, so that the rotating handle 92 has a tendency to rotate toward the side away from the handle 91. Therefore, in normal state, the rotating handle 92 is located at the side away from the handle 91 and is in an open state.

[0035] Furthermore, a self-locking assembly 10 for preventing misoperation is provided between the grip 91 and the rotating handle 92, and the self-locking assembly 10 includes a trigger 101, a clamping block 102, a ratchet 103 and a second torsion spring. One end of the trigger 101 is hinged in the grip 91, and the rotation axis of the trigger 101 is parallel to the rotation axis of the rotating handle 92. The clamping block 102 is fixedly connected to one end of the trigger 101; the ratchet 103 is coaxially fixedly connected to the hinge axis of the rotating handle 92; the second torsion spring is fixedly connected between the trigger 101 and the grip 91, and the second torsion spring makes the clamping block 102 press against the ratchet 103, thereby limiting the rotation of the rotating handle 92 by limiting the rotation of the ratchet 103, thereby realizing the self-locking of the rotating handle 92.

[0036] Reference Figure 4 and Figure 5 The cutting mechanism 2 includes a mounting block 21, a wire 22 and a connecting assembly 23. The mounting block 21 is fixedly connected to one end of the hollow tube 11 away from the handle 91, and the mounting block 21 is a rectangular block. The mounting block 21 is provided with a through hole 211 for the tendon to pass through, and the axis of the through hole 211 is parallel to the axis of the hollow tube 11. The wire 22 is a molybdenum wire for wire cutting, with a diameter of 0.18 mm; the wire 22 is arranged on one side of the mounting block 21 close to the handle 91, and the length direction of the wire 22 is perpendicular to the axis of the hollow tube 11.

[0037] Reference Figure 5 and Figure 6 The connecting assembly 23 includes two groups of connecting parts, which are respectively arranged at the two ends of the silk thread 22, so that the silk thread 22 can slide along the radial direction of the perforation 211, thereby realizing the cutting of the tendon inserted in the perforation 211. The connecting parts include a mounting seat 231, a first elastic member 232, a guide wheel 233 and a connecting rope 234. The mounting seat 231 is arranged on the mounting block 21 to slide along the radial direction of the perforation 211, and the end of the silk thread 22 is fixedly connected to the mounting seat 231, so that the mounting seat 231 can drive the silk thread 22 to slide when sliding. The first elastic member 232 is a spring, and the first elastic member 232 is fixedly connected between the top wall of the mounting seat 231 and the mounting block 21. Under normal conditions, the first elastic member 232 is at its original length, and the silk thread 22 is located above the perforation 211. The guide wheel 233 is rotatably arranged on the mounting block 21. There are two guide wheels 233. The axis of one guide wheel 233 is arranged along the axis direction of the through hole 211, and the axis of the other guide wheel 233 is arranged along the sliding direction of the mounting seat 231. The guide wheel 233 is used to change the winding direction of the connecting rope 234. The connecting rope 234 is wound around the two guide wheels 233. The end of the connecting rope 234 close to the mounting seat 231 is arranged along the sliding direction of the mounting seat 231 and is fixedly connected to the mounting seat 231. The end of the connecting rope 234 away from the mounting seat 231 is arranged along the axis direction of the movable rod 12 and is fixedly connected to the end of the movable rod 12. Therefore, when the rotating handle 92 is pinched to make the movable rod 12 slide to the side away from the mounting block 21, the movable rod 12 can drive the mounting seat 231 to slide down through the connecting rope 234, and the mounting seat 231 drives the silk thread 22 to slide down, thereby realizing the cutting of the tendon in the through hole 211.

[0038] Furthermore, the mounting seat 231 includes a support block 2311 and a winding roller 2312. Two support blocks 2311 are provided and are arranged in parallel at intervals, wherein one support block 2311 is slidably arranged on the mounting block 21; the winding roller 2312 is rotatably arranged between the two support blocks 2311, the axis of the winding roller 2312 is parallel to the axis of the perforation 211, and one end of the wire 22 is fixedly connected to the winding roller 2312. Under normal conditions, the two ends of the wire 22 are respectively wound on the winding rollers 2312 on both sides, and the wire 22 is in a stretched state. A rotating component 3 for driving the winding roller 2312 to rotate is provided on the mounting block 21.

[0039] The rotating assembly 3 is provided with two groups, and corresponds to the two winding rollers 2312 respectively; the rotating assembly 3 includes a first rack 31 and a gear 32. The first rack 31 is arranged along the sliding direction of the mounting seat 231, and the top of the first rack 31 is fixedly connected to the mounting block 21. The gear 32 is coaxially fixedly connected to the winding roller 2312, and the gear 32 is meshed with the first rack 31. The teeth of the first rack 31 at both ends of the wire 22 face the side close to each other, wherein one winding roller 2312 is located above the wire 22, and the other winding roller 2312 is located below the wire 22, so that during the sliding process of the wire 22, the gears 32 on the two winding rollers 2312 rotate in opposite directions. With the cooperation of the first rack 31 and the gear 32, the winding roller 2312 can rotate around its own axis while sliding downward. Since the two winding rollers 2312 rotate in opposite directions, one of the winding rollers 2312 can reel in the end of the wire 22, and the other winding roller 2312 can unwind the wound wire 22, so that the wire 22 slides along its own length direction. That is, the wire 22 can slide along its own length direction while sliding downward, thereby enhancing the cutting effect on the tendon.

[0040] After the tendon removal operation is completed, the used tendon removal device needs to be disinfected. In order to facilitate the unfolding and disinfection of the silk thread 22, a support block 4 is slidably arranged on the mounting block 21; a limit block is fixedly connected to the support block 4, and a limit groove 212 is provided on the mounting block 21. The limit block is slidably arranged in the limit groove 212, so that the support block 4 and the mounting block 21 are slidably connected. The ends of the first elastic member 232 and the connecting rope 234 are respectively fixedly connected to the two sides of the support block 4, so that the support block 4 can automatically reset under the action of the first elastic member 232 after sliding downward. A sliding block is fixedly connected to the support block 2311 near one side of the support block 4, and a sliding groove is provided on the surface of the support block 4 along its own length direction. The sliding block is slidably arranged in the sliding groove, so that the support block 2311 and the support block 4 are slidably connected. A fixing member for fixing the support block 2311 is provided between the support block 2311 and the support block 4.

[0041] Reference Figure 5In this embodiment, the fixing member is a rod 5 that is slidably inserted into the support block 2311. Correspondingly, a slot 41 is provided on the support block 4 for the end of the rod 5 to be inserted. The support block 2311 can be fixed to the support block 4 by inserting the end of the rod 5 into the slot 41. Two slots 41 are provided. When the end of the rod 5 is inserted into one of the slots 41, the gear 32 on the winding roller 2312 is meshed with the first rack 31; when the end of the rod 5 is inserted into the other slot 41, the gear 32 on the winding roller 2312 is in a separated state from the first rack 31. In other embodiments, the fixing member can also be set as a magnet block fixedly connected to the support block 2311 and the support block 4. The two magnet blocks that attract each other can fix the support block 2311 on the support block 4.

[0042] Therefore, when the silk thread 22 needs to be disinfected, the mounting seat 231 can be slid to the side away from the first rack 31, and the end of the insertion rod 5 can be inserted into the corresponding slot 41; then the silk thread 22 can be pulled so that the two ends of the silk thread 22 are gradually unfolded from the two winding rollers 2312, and then the unfolded silk thread 22 can be conveniently disinfected. After the disinfection is completed, the two winding rollers 2312 are rotated again to wind the two ends of the silk thread 22 on the two winding rollers 2312; then the support block 2311 is slid, and the insertion rod 5 is inserted into the other slot 41, so that the gear 32 on the winding roller 2312 is meshed with the first rack 31, which is convenient for the subsequent tendon cutting.

[0043] Reference Figure 6 , a first torsion spring 6 is arranged between the winding roller 2312 and the support block 2311. In the initial state, the gear 32 is meshed with the top of the first rack 31. At this time, a part of the silk thread 22 is wound around each winding roller 2312, and the first torsion spring 6 is in an untwisted state. In the process of disinfecting the silk thread 22, the silk thread 22 can be pulled outward so that the two ends of the silk thread 22 are unfolded from the winding roller 2312. In this process, the winding roller 2312 rotates and the first torsion spring 6 is twisted; when the disinfection is completed, the silk thread 22 can be loosened. Under the action of the first torsion spring 6, the two winding rollers 2312 can automatically rotate to tighten the silk thread 22. Subsequently, it is only necessary to slide the mounting seat 231 to the side close to the first rack 31, and then insert the insertion rod 5 to fix the mounting seat 231 on the support block 4. Therefore, the setting of the first torsion spring 6 makes the installation process after disinfection more convenient.

[0044] Furthermore, the teeth on the first rack 31 are arranged in multiple sections and are evenly spaced along the length direction. Therefore, when the winding roller 2312 slides down, the gear 32 slides down along with it, and when the gear 32 meshes with the first rack 31, the gear 32 can rotate in one direction; when the gear 32 slides to the part of the first rack 31 where the teeth are not arranged, the gear 32 is disengaged from the teeth, and thus under the action of the first torsion spring 6, the gear 32 rotates in the opposite direction; and then reciprocates in this way, so that the gear 32 can alternately rotate forward and reverse during the sliding process, so that the winding roller 2312 rotates forward and reverse, so that the silk thread 22 can slide back and forth along its own length direction during the sliding process, thereby further enhancing the cutting effect on the tendon.

[0045] Reference Figure 1 In addition, a protective shell 8 is slidably and detachably connected to one end of the mounting block 21 near the handle 91, and the protective shell 8 is arranged on the outside of the cutting mechanism 2. When the tendon cutting operation is performed, the protective shell 8 can be installed on the mounting block 21 to protect the internal structure; after the tendon cutting operation is completed, when the silk thread 22 needs to be disinfected, the protective shell 8 can be removed.

[0046] The implementation principle of Example 1 is as follows: an incision is made on the patient's knee, the end of the tendon of the patient's knee is cut open with a knife, and then the end of the tendon is clamped with a tool pliers, and the end of the tendon is inserted into the perforation 211. The gripping handle 91 and the rotating handle 92 are held and pushed into the incision of the patient's knee, so that the mounting block 21 slides to the inner side of the tendon along the length direction of the tendon; by observing the scale line 111 on the hollow tube 11, the sliding is stopped after the required length is slid. Then the trigger 101 is pulled to cancel the locking of the rotating handle 92; the rotating handle 92 is pinched to rotate the rotating handle 92 to the side close to the gripping handle 91, and the movable rod 12 slides outward, and the movable rod 12 drives the silk thread 22 to slide downward through the connecting rope 234, thereby cutting the tendon.

[0047] During the process of the thread 22 sliding down, due to the cooperation between the first rack 31 and the gear 32, the thread 22 can also slide back and forth along its own length direction, thereby increasing the cutting force on the tendon, helping to enhance the cutting effect on the tendon, making the cutting surface smoother, and facilitating the subsequent production of tendon grafts. After the tendon is cut, the cut tendon is removed; then the trigger 101 is released, and then the rotating handle 92 is released, and the second elastic member 93 causes the rotating handle 92 to rotate to the side away from the grip 91 for resetting; then the tendon remover is removed from the incision of the patient's knee.

[0048] Example 2 Reference Figure 7The difference between this embodiment and embodiment 1 is that, in this embodiment, the sides of the two first racks 31 close to each other are fixedly connected with the second rack 7, and the second rack 7 is parallel to the first rack 31; the first rack 31 and the second rack 7 are connected by a connecting rod 13. The teeth of the two second racks 7 face the sides away from each other. The teeth on the second rack 7 are arranged in multiple sections, and are evenly spaced along the length direction. The teeth on the second rack 7 and the teeth on the first rack 31 are staggered, so the gear 32 does not mesh with the teeth on the first rack 31 and the second rack 7 at the same time, and the gear 32 only meshes with one of the first rack 31 and the second rack 7 at each position.

[0049] Therefore, during the process of gear 32 sliding down, gear 32 first meshes with first rack 31, and gear 32 rotates in one direction; after gear 32 slides down a certain distance, gear 32 meshes with second rack 7 again, and gear 32 rotates in another direction; then, gear 32 rotates back and forth alternately, so that thread 22 can slide back and forth along its own length direction during the sliding process, thereby enhancing the cutting effect on the tendon. Since gear 32 is always meshed with one of first rack 31 and second rack 7, the rotation of gears 32 at both ends of thread 22 is synchronous, so that thread 22 can always be in a straight state during the sliding process, thereby ensuring the cutting effect on the tendon.

[0050] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gun-type tendon extractor, characterized in that: include: A base body (1), the base body (1) comprising a hollow tube (11) and a movable rod (12), the movable rod (12) being coaxially slidably arranged in the hollow tube (11); A cutting mechanism (2), wherein the cutting mechanism (2) is arranged at one end of the base body (1), and the cutting mechanism (2) comprises: A mounting block (21) is fixedly mounted on one end of the hollow tube (11), the mounting block (21) being provided with a through hole (211) for the tendon to pass through, and the axis of the through hole (211) is parallel to the axis of the hollow tube (11); a silk thread (22), wherein the length direction of the silk thread (22) is perpendicular to the axis of the hollow tube (11), and the silk thread (22) is slidably arranged on the mounting block (21) along the radial direction of the through hole (211), so that the silk thread (22) can cut the tendon passing through the through hole (211) when sliding; The connecting assembly (23) comprises connecting components arranged at both ends of the wire (22), the connecting components comprising a mounting seat (231), a first elastic member (232), a guide wheel (233) and a connecting rope (234); the mounting seat (231) is connected to the end of the wire (22); the mounting seat (231) is radially slidably arranged on the mounting block (21) along the through hole (211); the first elastic member (232) is fixedly connected between the mounting seat (231) and the mounting block (21); the guide wheel (233) is rotatably arranged on the mounting block (21); the connecting rope (234) is wound around the guide wheel (233); one end of the connecting rope (234) is arranged along the sliding direction of the mounting seat (231) and is fixedly connected to the mounting seat (231); the other end of the connecting rope (234) is arranged along the axial direction of the hollow tube (11) and is fixedly connected to the movable rod (12).

2. The gun-type tendon extractor according to claim 1, characterized in that: The mounting seat (231) comprises two support blocks (2311) and a winding roller (2312) rotatably arranged between the two support blocks (2311); the two ends of the wire (22) are respectively fixedly connected to the two winding rollers (2312); the mounting block (21) is provided with a rotating assembly (3) for driving the winding roller (2312) to rotate; the rotating assembly (3) is provided with two groups and respectively corresponds to the two winding rollers (2312); the rotating assembly (3) comprises a first rack (31) and a gear (32); the first rack (31) is fixedly connected to the mounting block (21) along the sliding direction of the mounting seat (231); the gear (32) is coaxially fixedly connected to the winding roller (2312); the gear (32) is used to mesh with the first rack (31).

3. A gun-type tendon extractor according to claim 2, characterized in that: A support block (4) is radially slidably arranged along the through hole (211) on the mounting block (21), the support block (2311) is slidably arranged on the support block (4), and a fixing member for fixing the support block (2311) on the support block (4) is arranged between the support block (2311) and the support block (4).

4. The gun-type tendon extractor according to claim 3, characterized in that: A first torsion spring (6) is provided between the winding roller (2312) and the support block (2311).

5. The gun-type tendon extractor according to claim 4, characterized in that: The teeth on the first rack (31) are arranged in multiple sections and are evenly spaced.

6. The gun-type tendon extractor according to claim 5, characterized in that: A second rack (7) is fixedly connected to the mounting block (21); the second rack (7) is parallel to the first rack (31); the second rack (7) is provided with two racks corresponding to the two first racks (31) respectively; the teeth on the second rack (7) are provided with multiple sections and are evenly spaced; the teeth on the second rack (7) and the first rack (31) face toward a side close to each other; the teeth on the second rack (7) and the first rack (31) are respectively used to mesh with two sides of the gear (32).

7. The gun-type tendon extractor according to claim 1, characterized in that: A protective shell (8) is movably connected to the mounting block (21), and the protective shell (8) is arranged to cover the outside of the cutting mechanism (2).

8. The gun-type tendon extractor according to claim 1, characterized in that: A driving assembly (9) is provided at one end of the hollow tube (11) away from the cutting mechanism (2), and the driving assembly (9) comprises a grip (91), a rotating handle (92) and a second elastic member (93); the grip (91) is fixedly connected to the end of the hollow tube (11); the rotating handle (92) is rotatably connected to the grip (91); a sliding groove (921) is provided on the rotating handle (92); an end of the movable rod (12) is fixedly connected to a limiting rod (121); the limiting rod (121) is slidably arranged in the sliding groove (921), so that when the rotating handle (92) rotates, the movable rod (12) can be driven to slide by the limiting rod (121); the second elastic member (93) is arranged between the grip (91) and the rotating handle (92), so that the rotating handle (92) has a tendency to rotate toward a side away from the grip (91).

9. The gun-type tendon extractor according to claim 8, characterized in that: A self-locking assembly (10) is arranged between the grip (91) and the rotating handle (92), and the self-locking assembly (10) comprises a trigger (101), a clamping block (102), a ratchet (103) and a second torsion spring. The trigger (101) is rotatably arranged on the grip (91), the clamping block (102) is fixedly connected to the trigger (101), the ratchet (103) is fixedly connected to the rotating handle (92), the axis of the ratchet (103) and the rotation axis of the rotating handle (92) are arranged coaxially, and the second torsion spring is fixedly connected between the trigger (101) and the grip (91) so that the clamping block (102) is pressed against the ratchet (103).

10. The gun-type tendon extractor according to claim 1, characterized in that: The hollow tube (11) is provided with scale lines (111).

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