A retrieval tool for unicompartmental prosthesis revision

Abstract

The application relates to the technical field of single-knee prosthesis taking-out, and particularly discloses a taking-out tool for single-knee prosthesis revision, which comprises a handle, the front end of the handle is fixedly connected with a long rod, the front end of the long rod is fixedly connected with a mounting seat, the inside upper end of the handle is provided with a first sliding cavity, the inside of the handle and the front end are jointly provided with an anti-uplift assembly, the anti-uplift assembly comprises a push rod movably connected to the inside of the handle, the front end of the push rod is movably connected with a connecting block, the front end of the connecting block is movably connected with a bone lever block, the first circular shaft is movably connected between the rear end of the bone lever block and the mounting seat, the rear end of the push rod is fixedly connected with a stop block, the outside lower end of the stop block is fixedly connected with a convex block, and the rear end of the stop block is movably connected with a first rotating rod. The rear end of the prosthesis wrapped in the soft tissue can be pried and taken out, so that the prosthesis can be pried in multiple directions, and the success rate of prosthesis taking-out is improved.

Description

Technical Field

[0001] This invention relates to the field of unicompartmental prosthesis removal technology, and in particular to a removal tool for unicompartmental prosthesis revision. Background Technology

[0002] A unicompartmental knee prosthesis is a medical device used to treat diseases of the medial or lateral compartment of the knee joint. Unicompartmental knee prostheses are suitable for unilateral knee replacement and can effectively treat unilateral compartment diseases of the knee joint and restore the lower limb alignment of the knee joint. Compared with total knee replacement, unicompartmental knee replacement has the advantages of less trauma, faster recovery, fewer surgical complications, and better postoperative function.

[0003] Prosthesis removal is an essential step in all joint revision surgeries. The complexity of the procedure depends on the reason for revision and the type of prosthesis. However, prosthesis removal is not always the easiest step in revision surgery. It requires the surgeon to have sufficient patience and care. Skilled prosthesis removal will help improve the efficiency of revision surgery.

[0004] In existing technical solutions, the bone scalpel blade is aligned with the bone or soft tissue to be cut, and appropriate force is applied to cut. After the cutting process, the bone suture is manually stimulated by continuous up-and-down movement to eventually separate it completely. However, when separating the prosthesis, the prosthesis is presented by bending the unicompartmental knee joint. When the prosthesis is difficult to separate, it is difficult to pry the prosthesis wrapped in soft tissue from multiple angles, which affects the unicompartmental prosthesis revision and removal work.

[0005] Therefore, a removal tool for unicompartmental prosthesis revision is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a removal tool for unicompartmental prosthesis revision, which can pry and remove the rear end of the prosthesis encased in soft tissue, thereby achieving multi-directional prying of the prosthesis and improving the success rate of the prosthesis, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a removal tool for unicompartmental prosthesis revision, comprising a handle, a long rod fixedly connected to the front end of the handle, a mounting base fixedly connected to the front end of the long rod, a first sliding cavity opened at the upper end of the handle, a tilting assembly jointly provided inside the handle and at the front end, the tilting assembly including a push rod movably connected to the inside of the handle, a connecting block movably connected to the front end of the push rod, a bone pry block movably connected to the front end of the connecting block, a first round shaft movably connected between the rear end of the bone pry block and the mounting base, a stop block fixedly connected to the rear end of the push rod, a protrusion fixedly connected to the lower outer end of the stop block, a first rotating rod movably connected to the rear end of the stop block, a second rotating rod movably connected to the rear end of the first rotating rod, and a first pad block movably connected to the rear end of the second rotating rod.

[0008] Preferably, the push rod is externally connected to a first spring, and the stop block is slidably fitted inside the first sliding cavity.

[0009] Preferably, the rear end of the second rotating rod and the rear end of the grip are jointly provided with a striking component. The striking component includes a slot and a groove formed at the outer rear end of the second rotating rod. The groove is located at the right end of the slot, and the front end of the first pad is fixedly connected to an installation block.

[0010] Preferably, a second pad is fixedly connected to the rear end of the grip, and a first groove and a second groove are provided on the outer rear end of the grip. The second groove is located at the front end of the first groove, and the second groove and the first groove are interconnected and perpendicular to each other.

[0011] Preferably, the lower end of the grip has a working cavity and a sealing cavity, the sealing cavity is located at the front end of the working cavity, the grip and the lower end of the push rod are provided with a fixing component, the fixing component includes a wheel movably connected to the lower end of the working cavity, a first slider is movably connected to the inside of the sealing cavity, a second round shaft is fixedly connected to the rear end of the first slider, a connecting rope is movably connected between the protrusion and the second round shaft, a round tube is fixedly connected to the front end of the sealing cavity, the lower side of the front end of the round tube extends to the lower end of the push rod, and a suction cup is fixedly connected to the front end of the round tube.

[0012] Preferably, a second spring is movably connected to the outside of the second circular shaft, and the connecting rope is wrapped around the outside of the connecting rope.

[0013] Preferably, the bone pry block is provided with a claw assembly inside. The claw assembly includes a second sliding cavity opened inside the bone pry block. A second slider is movably connected inside the second sliding cavity. A toothed block is fixedly connected to the front end of the second slider, and a trigger rod is fixedly connected to the rear end of the second slider.

[0014] Preferably, there are multiple toothed blocks, and a third spring is movably connected between the second slider and the bone lever block, and there are multiple third springs.

[0015] Preferably, the bone pry bar can be rotated within a range of 0 to 120 degrees, the second rotating rod and the first pad can be rotated within a range of 0 to 90 degrees, and the second rotating rod slides into the interior of the first and second sliding grooves.

[0016] Preferably, the elastic force of the first spring is greater than the weight of the push rod, and the elastic force of the second spring is greater than the weight of the first slider.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The tool for removing a unicompartmental prosthesis during revision surgery, by installing components such as a push rod, a first spring, a stop block, a first rotating rod, a connecting block, and a bone pry block, can pry and remove the rear end of the prosthesis encased in soft tissue, thereby achieving multi-directional prying of the prosthesis and improving the success rate of the prosthesis removal.

[0019] 2. This tool for removing a unicompartmental prosthesis during revision surgery, by installing components such as an installation block, a slot, a groove, a second pad, a first sliding groove, and a second sliding groove, allows the device to perform multi-directional tapping and fixing during prying operations, thereby facilitating the removal of the prosthesis and improving the efficiency of the prosthesis removal process.

[0020] 3. This tool for removing a unicompartmental prosthesis during revision surgery, by installing components such as a wheel, a first slider, a second shaft, a connecting rope, a tube, and a suction cup, can fix the prosthesis before it is pried, thus preventing the prosthesis from falling off under force and affecting the quality of the revision surgery.

[0021] 4. This tool for removing a unicompartmental prosthesis during revision surgery, by installing components such as a second sliding cavity, a second sliding block, a toothed block, a trigger rod, and a third spring, can fix the gap between the prosthesis and the bone cross section during prosthesis removal, thereby facilitating the removal of the prosthesis and improving the effectiveness of prosthesis removal. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1This is an overall structural view of the present invention;

[0024] Figure 2 This is a schematic diagram of the half-section structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall structure of the push rod of the present invention;

[0026] Figure 4 This is a schematic diagram of the striking assembly structure of the push rod of the present invention;

[0027] Figure 5 For the present invention Figure 2 Enlarged view of A in the middle;

[0028] Figure 6 This is a schematic diagram of a half-section of the bone lever of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Handle; 11. Long rod; 111. Mounting base; 12. First sliding cavity; 13. Working cavity; 14. Sealing cavity; 2. Anti-tilting assembly; 21. Push rod; 211. First spring; 212. Connecting block; 213. Bone pry block; 214. First round shaft; 22. Stop block; 221. Protrusion; 23. First rotating rod; 231. Second rotating rod; 232. First pad block; 3. Striking assembly; 31. Mounting block; 3 2. Slot; 321. Groove; 33. Second pad; 331. First slide groove; 332. Second slide groove; 4. Fixing assembly; 41. Wheel; 42. First slider; 421. Second shaft; 422. Second spring; 43. Connecting rope; 44. Round tube; 441. Suction cup; 5. Claw assembly; 51. Second slide cavity; 52. Second slider; 521. Tooth block; 522. Trigger rod; 53. Third spring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1 to 4 The present invention provides a technical solution:

[0033] A removal tool for unicompartmental prosthesis revision includes a handle 1, with a long rod 11 fixedly connected to the front end of the handle 1, and a mounting base 111 fixedly connected to the front end of the long rod 11. A first sliding cavity 12 is formed at the upper end of the handle 1. An anti-tilting assembly 2 is provided both inside and at the front end of the handle 1. The anti-tilting assembly 2 includes a push rod 21 movably connected to the inside of the handle 1. A connecting block 212 is movably connected to the front end of the push rod 212. A bone lever 213 is movably connected to the front end of the connecting block 212. A first round shaft 214 is movably connected between the rear end of the bone lever 213 and the mounting base 111. A stop block 2 is fixedly connected to the rear end of the push rod 21. 2. A protrusion 221 is fixedly connected to the lower outer end of the stop block 22. A first rotating rod 23 is movably connected to the rear end of the stop block 22. A second rotating rod 231 is movably connected to the rear end of the first rotating rod 23. A first pad 232 is movably connected to the rear end of the second rotating rod 231. A first spring 211 is movably connected to the outside of the push rod 21. The stop block 22 slides against the inside of the first sliding cavity 12. The bone pry block 213 can rotate within a range of 0 to 120 degrees. The second rotating rod 231 and the first pad 232 can rotate within a range of 0 to 90 degrees. The second rotating rod 231 slides against the inside of the first sliding groove 331 and the second sliding groove 332.

[0034] By employing the above technical solution, when revising and removing a unicompartmental prosthesis, the patient's legs must first be fixed in a bent position, with the knee joint supported. Then, the prosthesis is removed. By flipping the second rotating rod 231, it slides into the first sliding groove 331, supporting and fixing the push rod 21 and the bone lever 213 at the front end of the connecting block 212. This allows for the prying and separation of the prosthesis from the bone. For prostheses that are difficult to pry, multiple prying maneuvers are required. Move the second rotating rod 231 to the inside of the handle 1. Push the rod 21 forward to compress the first spring 211 inside the first sliding cavity 12. As the push rod 21 pushes, it moves the connecting block 212 to the front end, which in turn pushes the bone lever 213 to rotate around the first circular shaft 214 as the fulcrum, so that the push rod 21 and the bone lever 213 are hooked. Then move the bone lever 213 to the part that fits the prosthesis. At this time, force is applied to pry and remove the rear end of the prosthesis wrapped in the soft tissue through the anti-prying component 2, thereby achieving multi-directional prying of the prosthesis and improving the efficiency of prosthesis removal.

[0035] Specifically, such as Figure 2 and Figure 4As shown, the rear end of the second rotating rod 231 and the rear end of the grip 1 are jointly provided with a striking component 3. The striking component 3 includes a slot 32 and a groove 321 opened at the outer rear end of the second rotating rod 231. The groove 321 is located at the right end of the slot 32. The front end of the first pad 232 is fixedly connected to the mounting block 31. The rear end of the grip 1 is fixedly connected to the second pad 33. The outer rear end of the grip 1 is provided with a first sliding groove 331 and a second sliding groove 332. The second sliding groove 332 is located at the front end of the first sliding groove 331. The second sliding groove 332 and the first sliding groove 331 are interconnected and perpendicular to each other.

[0036] By adopting the above technical solution, the gap of the prosthesis is fixed by the anti-pry component 2. When force needs to be applied to the device, the second rotating rod 231 is first pushed into the handle 1, and then the second rotating rod 231 is bent so that it slides into the first sliding groove 331. Then the second rotating rod 231 is rotated into the second sliding groove 332. The first pad 232 is flipped so that it is stuck in the slot 32 and the mounting block 31 is stuck into the groove 321. At this time, the first pad 232 is struck with a small hammer so that the striking component 3 can perform multi-directional striking and fixing when prying in multiple directions, thereby facilitating the removal of the prosthesis and improving the efficiency of the prosthesis removal work.

[0037] Specifically, such as Figure 2 and Figure 5 As shown, the lower end of the grip 1 has a working cavity 13 and a sealing cavity 14. The sealing cavity 14 is located at the front end of the working cavity 13. The grip 1 and the lower end of the push rod 21 are jointly provided with a fixing component 4. The fixing component 4 includes a wheel 41 movably connected to the lower end of the working cavity 13. The sealing cavity 14 is movably connected to a first slider 42. The rear end of the first slider 42 is fixedly connected to a second shaft 421. A connecting rope 43 is movably connected between the protrusion 221 and the second shaft 421. The front end of the sealing cavity 14 is fixedly connected to a round tube 44. The lower side of the front end of the round tube 44 extends to the lower end of the push rod 21. The front end of the round tube 44 is fixedly connected to a suction cup 441. The outside of the second shaft 421 is movably connected to a second spring 422. The connecting rope 43 is wrapped around the outside of the connecting rope 43. The elastic force of the first spring 211 is greater than the weight of the push rod 21, and the elastic force of the second spring 422 is greater than the weight of the first slider 42.

[0038] By adopting the above technical solution, before prying the prosthesis, the suction cup 441 needs to be attached to the upper end of the prosthesis. Then, after the first rotating rod 23 is pushed into the handle 1, the stop block 22 moves forward, taking the lower protrusion 221 with it. As the protrusion 221 moves forward, it passes around the wheel 41, causing the connecting rope 43 inside the working cavity 13 to be pulled backward toward the second shaft 421. The second shaft 421 moves backward, causing the first slider 42 to compress the second spring 422 and move backward. As the internal space of the front end of the first slider 42 increases, the suction cup 441 communicates with the inside of the sealed cavity 14 through the round tube 44. Then, air is drawn out from the inside of the suction cup 441 to form a vacuum negative pressure, thereby tightly adsorbing the suction cup 441 and the prosthesis together. After the prosthesis is removed, the fixing component 4 can fix the prosthesis to prevent it from falling off after being pried off by force, which would affect the quality of the reconstructed prosthesis.

[0039] Specifically, such as Figure 2 and Figure 6 As shown, the bone lever 213 is provided with a claw assembly 5 inside. The claw assembly 5 includes a second sliding cavity 51 opened inside the bone lever 213. A second slider 52 is movably connected inside the second sliding cavity 51. A toothed block 521 is fixedly connected to the front end of the second slider 52. A trigger rod 522 is fixedly connected to the rear end of the second slider 52. There are multiple toothed blocks 521. A third spring 53 is movably connected between the second slider 52 and the bone lever 213. There are multiple third springs 53.

[0040] By adopting the above technical solution, the bone pry block 213 is bent and flipped by the anti-tilting component 2. As the bone pry block 213 flips, the trigger rod 522 inside the second sliding cavity 51 also flips. After the trigger rod 522 contacts the mounting seat 111 at the front end of the long rod 11, it is pressed and pushes the second slider 52 forward. The forward movement of the second slider 52 compresses multiple third springs 53 and pushes the toothed block 521 forward, so that the toothed block 521 protrudes to the front end of the bone pry block 213. This achieves the goal of fixing the gap between the prosthesis and the bone cross section when the prosthesis is removed by the claw component 5, thereby facilitating the prying and removal of the prosthesis and improving the effect of prosthesis removal.

[0041] Working principle: When revising and removing a unicompartmental prosthesis, the patient's legs are first fixed in a bent position, with the knee joint supported. Then, the prosthesis is removed. By flipping the second rotating rod 231, it slides into the first sliding groove 331, supporting and fixing the push rod 21 and the bone lever 213 at the front end of the connecting block 212. This allows for the prying and separation of the prosthesis from the bone. When a prosthesis is difficult to pry open, it is necessary to pry it open from multiple angles. At this time, push the second rotating rod 231 into the handle 1. As the push rod 21 pushes, the connecting block 212 moves forward, which in turn pushes the bone lever 213 to rotate around the first circular shaft 214 as the fulcrum, so that the push rod 21 and the bone lever 213 are hooked. Then move the bone lever 213 to the part that fits the prosthesis. At this time, force is applied to pry open and remove the rear end of the prosthesis wrapped inside the soft tissue through the anti-prying component 2.

[0042] After pushing the second rotating rod 231 into the handle 1, the second rotating rod 231 is bent so that it slides into the first sliding groove 331. Then, the second rotating rod 231 is rotated into the second sliding groove 332. The first pad 232 is flipped and locked into the slot 32, and the mounting block 31 is locked into the groove 321. At this time, the first pad 232 is struck with a small hammer so that the striking component 3 can perform multi-directional striking and fixing when prying in multiple directions, thereby facilitating the removal of the prosthesis and improving the efficiency of the prosthesis removal work.

[0043] Before prying the prosthesis, the suction cup 441 needs to be attached to the upper end of the prosthesis. Then, the first rotating rod 23 is pushed into the handle 1, and the stop block 22 moves forward, taking the lower protrusion 221 with it. As the protrusion 221 moves forward, it passes around the wheel 41, causing the connecting rope 43 inside the working cavity 13 to be pulled backward toward the second shaft 421. The second shaft 421 moves backward, causing the first slider 42 to compress the second spring 422 and move backward. As the internal space of the front end of the first slider 42 increases, the suction cup 441 communicates with the sealed cavity 14 through the round tube 44. Then, air is drawn out from the suction cup 441 to form a vacuum negative pressure, thereby tightly adsorbing the suction cup 441 and the prosthesis together. After the prosthesis is removed, the fixing component 4 can fix the prosthesis to prevent it from falling off after being pried off by force, which would affect the quality of the reconstructed prosthesis.

[0044] After the bone pry block 213 is bent and flipped by the anti-tilting component 2, the trigger rod 522 inside the second sliding cavity 51 is flipped along with the bone pry block 213. After the trigger rod 522 contacts the mounting seat 111 at the front end of the long rod 11, it is pressed and pushes the second slider 52 forward. The forward movement of the second slider 52 compresses multiple third springs 53 and pushes the toothed block 521 forward, so that the toothed block 521 protrudes to the front end of the bone pry block 213. This achieves the purpose of fixing the gap between the prosthesis and the bone section when the prosthesis is removed by the claw component 5, thereby facilitating the prying and removal of the prosthesis and improving the effect of prosthesis removal.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A removal tool for unicompartmental prosthesis revision, comprising a handle (1), characterized in that: The front end of the grip (1) is fixedly connected to a long rod (11), and the front end of the long rod (11) is fixedly connected to a mounting base (111). A first sliding cavity (12) is opened at the upper end of the inside of the grip (1). An anti-tilting component (2) is provided inside the grip (1) and at the front end. The anti-tilting component (2) includes a push rod (21) movably connected to the inside of the grip (1). The front end of the push rod (21) is movably connected to a connecting block (212), and the front end of the connecting block (212) is movably connected to a bone lever (…). 213), the rear end of the bone pry block (213) is movably connected to the mounting base (111) with a first round shaft (214), the rear end of the push rod (21) is fixedly connected to a stop block (22), the lower outer end of the stop block (22) is fixedly connected to a protrusion (221), the rear end of the stop block (22) is movably connected to a first rotating rod (23), the rear end of the first rotating rod (23) is movably connected to a second rotating rod (231), and the rear end of the second rotating rod (231) is movably connected to a first pad block (232); The push rod (21) is externally connected to a first spring (211), and the stop block (22) slides against the inside of the first sliding cavity (12); The rear end of the grip (1) is fixedly connected to a second pad (33). The outer rear end of the grip (1) is provided with a first sliding groove (331) and a second sliding groove (332). The second sliding groove (332) is located at the front end of the first sliding groove (331). The second sliding groove (332) and the first sliding groove (331) are connected and perpendicular to each other. The bone lever (213) can be rotated in a range of 0 to 120 degrees, and the second rotating rod (231) and the first pad (232) can be rotated in a range of 0 to 90 degrees. The second rotating rod (231) slides and fits inside the first sliding groove (331) and the second sliding groove (332).

2. The removal tool for unicompartmental prosthesis revision according to claim 1, characterized in that: The rear end of the second rotating rod (231) and the rear end of the grip (1) are provided with a striking component (3). The striking component (3) includes a slot (32) and a groove (321) opened at the rear end of the second rotating rod (231). The groove (321) is located at the right end of the slot (32). The front end of the first pad (232) is fixedly connected to an installation block (31).

3. The removal tool for unicompartmental prosthesis revision according to claim 1, characterized in that: The grip (1) has a working cavity (13) and a sealing cavity (14) at its lower end. The sealing cavity (14) is located at the front end of the working cavity (13). The grip (1) and the lower end of the push rod (21) are provided with a fixing component (4). The fixing component (4) includes a wheel (41) movably connected to the lower end of the working cavity (13). The sealing cavity (14) is movably connected to a first slider (42). The rear end of the first slider (42) is fixedly connected to a second round shaft (421). The protrusion (221) and the second round shaft (421) are movably connected to a connecting rope (43). The front end of the sealing cavity (14) is fixedly connected to a round tube (44). The lower side of the front end of the round tube (44) extends to the lower end of the push rod (21). The front end of the round tube (44) is fixedly connected to a suction cup (441).

4. The removal tool for unicompartmental prosthesis revision according to claim 3, characterized in that: The second round shaft (421) is externally connected to a second spring (422), and the connecting rope (43) surrounds the outside of the round wheel (41).

5. The removal tool for unicompartmental prosthesis revision according to claim 3, characterized in that: The bone pry bar (213) is provided with a claw assembly (5). The claw assembly (5) includes a second sliding cavity (51) opened inside the bone pry bar (213). A second slider (52) is movably connected inside the second sliding cavity (51). A toothed block (521) is fixedly connected to the front end of the second slider (52), and a trigger rod (522) is fixedly connected to the rear end of the second slider (52).

6. A removal tool for unicompartmental prosthesis revision according to claim 5, characterized in that: The number of the toothed blocks (521) is multiple, and a third spring (53) is movably connected between the second slider (52) and the bone lever (213), and the number of the third springs (53) is multiple.

7. The removal tool for unicompartmental prosthesis revision according to claim 4, characterized in that: The elastic force of the first spring (211) is greater than the weight of the push rod (21), and the elastic force of the second spring (422) is greater than the weight of the first slider (42).

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