A tibial removal device for knee joint revision

Abstract

This invention belongs to the field of medical device technology, specifically a tibial support removal device for knee joint revision surgery. It includes an anterior removal component and a posterior removal component. The posterior removal component includes a connecting rod, an impact block fixed to the outside of the connecting rod, and a fixing rod fixed to the end of the connecting rod away from the impact block. A sliding hammer is slidably connected to the outside of the connecting rod and between the impact block and the fixing rod. A sickle-shaped removal device is bolted to the end of the fixing rod away from the connecting rod. Both the fixing rod and the sickle-shaped removal device have multiple threaded holes inside. The sickle-shaped design effectively allows the device to be inserted into the tibia and the posterior side of the tibial support, avoiding damage to the tibial bone and ligaments on both sides. The sliding hammer's built-in striking structure facilitates the separation of the tibia and the tibial support, thus achieving the effect of convenient separation of the tibial support and the tibia, reducing surgical time, and avoiding damage to the tibial bone and ligaments on both sides.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically a tibial removal device for knee joint revision surgery. Background Technology

[0002] During primary knee replacement surgery, bone cement is used to bond the tibial support to the tibia. However, in revision knee surgery, the tibial support needs to be separated from the tibia. Currently, a bone scalpel is generally used to separate the tibial support from the tibia and remove the tibial support. However, this separation method is not very efficient. Some people have invented separation tools suitable for the tibial support.

[0003] A Chinese patent with publication number CN108451674A discloses a tibial inserter and extractor, comprising a base, an elastic element, a cam, a handle, and a locking block. The base is a cylindrical structure with an internal cavity. The elastic element, cam, and locking block are sequentially connected and placed within the cavity from top to bottom. A fixing groove matching the prosthesis's dimensions is provided on the side wall at the bottom of the cavity. A guide groove is provided on the side wall of the base. One end of the handle passes through the guide groove and is fixedly connected to the cam. Reciprocatingly moving the handle along the guide groove causes the handle to rotate the cam, thereby allowing the locking block to be radially pushed out or retracted into the fixing groove along the base. The cam structure, which pushes out or retracts the locking block to achieve the locking and fixation of the prosthesis, is simple in structure. Locking is achieved by simply moving the handle, making operation easy. The fixing groove matching the prosthesis's dimensions ensures a more secure lock and higher positioning accuracy.

[0004] The above-mentioned technical solution proposes to limit and clamp the tibial support by opening a fixing groove on the base. However, the base area is large in this solution, which can easily cause tibial bone loss and damage to the ligaments on both sides during actual operation. At the same time, it is very difficult to separate the tibial support from the tibia in this technical solution, which requires the use of external tools such as hammers, and the operation time is long. Therefore, the present invention provides a tibial support removal device for knee joint revision surgery. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a tibial ...

[0007] The rear extraction assembly includes a connecting rod, an impact block is fixed to the outside of the connecting rod, a fixing rod is fixed to the end of the connecting rod away from the impact block, a sliding hammer is slidably connected to the outside of the connecting rod and between the impact block and the fixing rod, and a sickle-shaped extractor is bolted to the end of the fixing rod away from the connecting rod. Both the fixing rod and the sickle-shaped extractor have multiple threaded holes inside.

[0008] The anterior extraction assembly includes a connecting rod with an impact block fixed externally. A connecting handle is rotatably connected to the end of the connecting rod away from the impact block. An arc-shaped single blade is fixed to the end of the connecting handle near the connecting rod. A mounting bracket is fixed externally to the connecting rod and above the arc-shaped single blade. A fastening bolt is threaded into the mounting bracket, and the fastening bolt is compatible with the threaded holes inside the fixing rod and the sickle-shaped extractor. During operation, the patient is first anesthetized. A longitudinal incision is made in the anterior midline to expose the primary knee joint. The posterior extractor is inserted from both sides of the knee joint, with the blade of the sickle-shaped extractor positioned between the tibia and the posterior space of the tibial support. Then, the anterior extractor is used, with the blade of the arc-shaped single blade positioned between the tibia and the anterior space of the tibial support. The sliding hammer on the posterior extractor is then manually pulled to slide on the connecting rod until it impacts the impact block, achieving a striking effect. At this point, the sickle-shaped extractor will engage between the tibia and the tibial support, allowing the tibia and tibial support to be separated. As the tibial support separates to a certain extent, the side of the tibia and tibial support away from the sickle-shaped extractor will close together, thus locking the arc-shaped single blade. Then, by rotating the mounting bracket, adjust the position of the fastening bolt until it matches the threaded hole on the fixing rod and the sickle-shaped extractor. Rotate the fastening bolt until it is inserted into the threaded hole on the fixing rod and the sickle-shaped extractor, thus fixing the front and rear extractors together. Then, manually pull the sliding hammer on the front extractor to slide it on the connecting rod, striking it to further separate the tibia and tibial support. Repeat this striking process with the front and rear extractors until the tibia and tibial support are separated. This device is simple to use, with a built-in striking structure. During use, the sickle-shaped design allows the device to effectively extend behind the tibia and tibial support, avoiding damage to the tibial bone and ligaments on both sides. This achieves the effect of conveniently separating the tibial support and tibia, reducing surgical time, and avoiding damage to the tibial bone and ligaments on both sides.

[0009] Preferably, the sickle-shaped extractor has a locking blade slidably connected inside. An elastic bladder is installed inside the locking blade and on the side closest to the sickle-shaped extractor. Both ends of the elastic bladder are fixed with exhaust nozzles. An exhaust pipe is fixed to the outside of the exhaust nozzle on the side away from the sickle-shaped extractor. The exhaust pipe is connected to the locking blade. During operation, when installing the sickle-shaped extractor, the locking blade needs to be aligned with the gap between the patient's tibia and tibial support. Then, the fixing rod is pulled to move the sickle-shaped extractor. At this time, the locking blade will slide inside the sickle-shaped extractor, thereby pushing the elastic bladder to move until it is squeezed. After being squeezed, the elastic bladder will generate airflow. This airflow will be injected into the exhaust pipe through the exhaust nozzle and finally blown out through the exhaust pipe. It should be noted that there is synovial fluid between normal human joints, secreted by the synovial membrane, which lubricates the joint. The blown airflow will blow away the synovial fluid between the surface of the locking blade and the gap between the tibia and tibial support, thereby preventing slippage during installation and causing injury.

[0010] Preferably, a limiting block is slidably connected to the outside of the locking blade, the limiting block is slidably connected to the sickle-shaped extractor, and a storage spring is fixed between the limiting block and the sickle-shaped extractor. A locking groove adapted to the limiting block is opened on the outside of the locking blade, and an iron block is fixed inside the limiting block. During operation, it should be noted that the storage spring is in a compressed state in the initial state. During the sliding process of the locking blade, it will simultaneously drive the locking groove to move. When the locking groove moves to the point where its axis is on the same straight line as the axis of the limiting block, the elastic potential energy of the storage spring is released, thereby pushing the limiting block into the locking groove. At this time, the locking blade and the sickle-shaped extractor can be fixed as a whole, which facilitates the subsequent knocking and separation work. In addition, during the process of the storage spring driving the limiting block to pop out, the storage spring will simultaneously knock on the locking blade, thereby causing the locking blade to vibrate to a certain extent. This vibration can promote the locking blade to be locked into the gap between the tibia and the tibia support.

[0011] Preferably, a striking ball is provided between the locking blade and the sickle-shaped extractor, and an elastic pull rod is fixed between the striking ball and the sickle-shaped extractor. The striking ball is positioned above the elastic bladder. During operation, after the locking blade moves to the point where the limiting block is engaged in the slot, there is still a certain distance between the locking blade and the sickle-shaped extractor. It should be noted that this distance is greater than the diameter of the striking ball. Therefore, during the subsequent tapping process using the sliding hammer, the striking ball will pull the elastic pull rod back and forth under the action of inertial force. The bouncing of the striking ball will tap the sickle-shaped extractor and the locking blade, thereby further promoting the locking blade to engage in the gap between the tibia and the tibia support.

[0012] Preferably, a sponge pad is fixed inside the locking blade and outside the exhaust pipe; during operation, when the locking blade is inserted between the tibia and the tibia support, after the locking blade stops blowing air, the sponge pad inside the locking blade will absorb excess human synovial fluid, further preventing slippage caused by excessive synovial fluid and protecting the patient.

[0013] Preferably, a positioning block is fixed inside the sponge pad, and an expansion column is fixed on the side of the positioning block near the center of the snap-fit ​​blade. A support frame is fixed outside the expansion column, and the support frame is slidably connected to the positioning block. Liquid absorption grooves are provided on the outside of the support frame and on both sides of the expansion column. During operation, after excessive synovial fluid is absorbed by the sponge pad, some of it will slide along the positioning block and the support frame into the washing liquid groove, and will eventually be absorbed by the expansion column. After absorbing the synovial fluid, the expansion column will expand to a certain extent, thereby pushing the positioning block to slide out of the support frame. The sliding positioning block will push the tibia and tibial support, thereby further improving the separation efficiency of the tibia and tibial support.

[0014] Preferably, an arc-shaped spring ring is fixed to the outside of the support frame and to the bottom side of the liquid absorption groove. The arc-shaped spring ring fits against the inner wall of the exhaust pipe and bends towards the positioning block. During operation, the arc-shaped spring ring can block excessive synovial fluid, preventing it from entering the exhaust and making subsequent cleaning and disinfection difficult. When the elastic bladder is compressed and venting, the interior of the exhaust pipe is large, allowing the arc-shaped spring ring to bend normally and venting to proceed normally.

[0015] Preferably, a sliding plug is provided on the side of the exhaust pipe away from the elastic bladder, and a guide groove is formed inside the locking blade between the sliding plug and the exhaust pipe. A puncture needle is fixed on the side of the sliding plug away from the exhaust pipe, and both the sliding plug and the puncture needle are slidably connected to the locking blade. During operation, it should be noted that due to the presence of synovial fluid in the tibia and tibial support, negative pressure cavities formed by the fluid film and the tibia and tibial support may appear at some joints, which is not conducive to the separation operation. During the process of the elastic bladder being pressurized and expelling gas, the sliding plug will also slide under the action of air pressure, thereby pushing the puncture needle to lock itself. The extended puncture needle effectively punctures the negative pressure water film between the tibia and tibial support, releasing the negative pressure and facilitating separation. Simultaneously, during the reciprocating bounce of the striking ball, it collides with the elastic capsule, causing a certain degree of deformation. At this point, the elastic capsule deforms minimally, and the released gas is insufficient to bend the arc-shaped spring ring. This smaller gas pressure then reciprocates, pushing the sliding plug to slide. The sliding plug, in turn, causes the puncture needle to reciprocate, further puncturing the water film between the tibia and tibial support, releasing the negative pressure, and facilitating the separation procedure.

[0016] Preferably, the elastic bladder has a hollow rod inside, and a pair of support rods are slidably connected inside the hollow rod. The ends of the pair of support rods that are far apart from each other are fixedly connected to the exhaust nozzles. A hollow plug is fixed inside the sickle-shaped extractor. The hollow plug is adapted to the exhaust nozzle on the side near the sickle-shaped extractor. A one-way valve is installed inside the hollow plug. During operation, when the elastic bladder is compressed, the support rod inside slides along the hollow rod, thereby controlling the direction of contraction of the elastic bladder. Before the elastic bladder deforms under pressure, the exhaust nozzle on the side near the hollow plug will first contact the hollow plug and be blocked by the hollow plug, so that the gas inside the elastic bladder can only be discharged through the exhaust pipe, thus facilitating the blowing operation.

[0017] Preferably, an air replenishment groove is provided inside the sickle-shaped extractor, on the side of the hollow plug away from the exhaust port. Multiple arc-shaped spring pieces are fixed to both sides of the inner wall of the air replenishment groove. A liquid storage ball is fixed to the end of each arc-shaped spring piece away from the sickle-shaped extractor. The liquid storage ball stores alcohol, and a drain hole is provided at the top of the liquid storage ball. During operation, after separating the patient's tibia and tibial support, the device needs to be reset for subsequent use. During reset, a magnet is manually used to attract the iron block inside the limiting block, causing the storage spring to contract, and then the contents flow through the air replenishment groove. Sterile gas is supplied to the equipment until it is fully reset. During this process, the flow rate of the sterile gas is changed, causing the airflow to pull the arc-shaped spring back and forth. As the spring bounces, the liquid storage ball discharges the alcohol stored inside. The discharged alcohol is introduced into the equipment along with the gas, thus automatically cleaning the equipment during the reset process. It should be noted that after the equipment is fully reset, the sterile gas should be kept running for a period of time so that the gas can be discharged through the exhaust pipe to clean the inside of the equipment thoroughly.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. The tibial support removal device for knee joint revision surgery described in this invention, through its sickle-shaped design, can effectively extend the device into the tibia and the posterior side of the tibial support, avoiding damage to the tibial bone and the ligaments on both sides. The sliding hammer with its own striking structure facilitates the separation of the tibia and the tibial support, thereby achieving the effect of convenient separation of the tibial support and the tibia, reducing operation time, and avoiding damage to the tibial bone and the ligaments on both sides.

[0020] 2. The tibial support removal device for knee joint revision described in this invention generates airflow by squeezing the elastic capsule. The airflow blows away the synovial fluid between the surface of the locking blade and the gap between the tibia and the tibial support, thereby preventing slippage and injury during installation. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a perspective view of the fixing rod structure in this invention;

[0024] Figure 3 This is a perspective view of the connecting handle structure in this invention;

[0025] Figure 4 This is a schematic diagram of the second embodiment of the sickle-shaped extractor structure in this invention;

[0026] Figure 5 This is the present invention. Figure 4 Enlarged view of a portion of point A in the middle;

[0027] Figure 6 This is the present invention. Figure 4 Enlarged view of section B in the middle.

[0028] In the diagram: 1. Connecting rod; 2. Sliding hammer; 3. Impact block; 4. Fixing rod; 5. Sickle-shaped extractor; 6. Connecting handle; 7. Arc-shaped single blade; 8. Mounting bracket; 9. Fastening bolt; 10. Snap-fit ​​blade; 11. Elastic bladder; 12. Limiting block; 13. Storage spring; 14. Slot; 15. Sponge pad; 16. Elastic pull rod; 17. Striking ball; 18. Sliding plug; 19. Puncture needle; 20. Arc-shaped spring ring; 21. Support frame; 22. Expansion column; 23. Positioning block; 24. Vent; 25. Support rod; 26. Hollow rod; 27. Hollow plug; 28. Liquid reservoir ball; 29. ​​Arc-shaped spring. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] Example 1

[0031] like Figures 1 to 3 As shown in the embodiment of the present invention, a tibial ...

[0032] The rear-side extraction assembly includes a connecting rod 1, an impact block 3 is fixed to the outside of the connecting rod 1, a fixing rod 4 is fixed to the end of the connecting rod 1 away from the impact block 3, a sliding hammer 2 is slidably connected to the outside of the connecting rod 1 and between the impact block 3 and the fixing rod 4, and a sickle-shaped extractor 5 is bolted to the end of the fixing rod 4 away from the connecting rod 1. Both the fixing rod 4 and the sickle-shaped extractor 5 have multiple threaded holes inside.

[0033] The front extraction assembly includes a connecting rod 1, an impact block 3 fixed to the outside of the connecting rod 1, a connecting handle 6 rotatably connected to the end of the connecting rod 1 away from the impact block 3, an arc-shaped single blade 7 fixed to the end of the connecting handle 6 near the connecting rod 1, and a mounting bracket 8 fixed to the outside of the connecting rod 1 and above the arc-shaped single blade 7. A fastening bolt 9 is threadedly connected inside the mounting bracket 8, and the fastening bolt 9 is compatible with the threaded holes inside the fixing rod 4 and the sickle-shaped extractor 5. During operation, the patient needs to be anesthetized first. However, a longitudinal incision is made in the anterior midline to expose the newly replaced artificial knee joint. The posterior extractor is inserted from both sides of the knee joint, with the blade of the sickle-shaped extractor 5 positioned between the tibia and the posterior space of the tibial support. Then, the anterior extractor is used, with the blade of the curved single-blade 7 positioned between the tibia and the anterior space of the tibial support. The sliding hammer 2 on the posterior extractor is then manually pulled to slide on the connecting rod 1 until it impacts the impact block 3, achieving a striking effect. At this point, the sickle-shaped extractor 5 will become lodged between the tibia and the tibial support. This causes a certain degree of separation between the tibia and the tibial support. At the same time, the side of the tibia and the tibial support away from the sickle-shaped extractor 5 will close together, thus locking the arc-shaped single blade 7. Then, adjust the position of the fastening bolt 9 by rotating the mounting bracket 8 until the fastening bolt 9 matches the threaded hole on the fixing rod 4 and the sickle-shaped extractor 5. Then, rotate the fastening bolt 9 until it is inserted into the threaded hole on the fixing rod 4 and the sickle-shaped extractor 5, thereby fixing the front extractor and the rear extractor as one unit. Then, manually pull the sliding hammer on the front extractor. 2. Slide it on connecting rod 1 and tap it to further separate the tibia and tibial support. Repeat this tapping with the front and rear extractors until the tibia and tibial support are separated. The device is simple to use and has a built-in tapping structure. At the same time, the sickle-shaped design can effectively extend the device into the posterior side of the tibia and tibial support, avoiding damage to the tibial bone and the ligaments on both sides. This achieves the effect of facilitating the separation of the tibial support and tibia, reducing operation time, and avoiding damage to the tibial bone and the ligaments on both sides.

[0034] Example 2

[0035] like Figure 4As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a locking blade 10 is slidably connected inside the sickle-shaped extractor 5. An elastic bladder 11 is installed inside the locking blade 10 and on the side close to the sickle-shaped extractor 5. Air vents 24 are fixed at both ends of the elastic bladder 11. An air vent pipe is fixed outside the air vent 24 on the side away from the sickle-shaped extractor 5, and the air vent pipe is connected to the locking blade 10. During operation, when installing the sickle-shaped extractor 5, the locking blade 10 needs to be aligned with the gap between the patient's tibia and tibial support, and then the fixing rod 4 is pulled to drive the sickle-shaped extractor. When device 5 moves, the locking blade 10 slides inside the sickle-shaped extractor 5, thereby pushing the elastic bladder 11 to move and squeezing it. After being squeezed, the elastic bladder 11 generates airflow, which is injected into the exhaust pipe through the exhaust nozzle 24 and finally blown out through the exhaust pipe. It should be noted that there is synovial fluid between normal human joints, secreted by the synovial membrane, which lubricates the joint. The blown airflow will blow away the synovial fluid between the surface of the locking blade 10 and the gap between the tibia and the tibia support, thereby preventing slippage during installation that could cause injury.

[0036] like Figure 4 As shown, the locking blade 10 is externally slidably connected to a limiting block 12, which is slidably connected to the sickle-shaped extractor 5. A storage spring 13 is fixed between the limiting block 12 and the sickle-shaped extractor 5. The locking blade 10 has a locking groove 14 that matches the limiting block 12 on its outside, and an iron block is fixed inside the limiting block 12. During operation, it should be noted that the storage spring 13 is initially compressed. During the sliding process of the locking blade 10, it will simultaneously drive the locking groove 14 to move. When the locking groove 14 moves to the point where its axis is perpendicular to the limiting block 12... When the axes are aligned, the elastic potential energy of the storage spring 13 is released, thereby pushing the limiting block 12 into the slot 14. At this time, the locking blade 10 and the sickle-shaped extractor 5 can be fixed as a whole, which facilitates subsequent knocking and separation. During the process of the storage spring 13 driving the limiting block 12 to pop out, the storage spring 13 will simultaneously knock the locking blade 10, thereby causing the locking blade 10 to vibrate to a certain extent. This vibration can promote the locking blade 10 to be inserted into the gap between the tibia and the tibia support.

[0037] like Figure 4As shown, a striking ball 17 is provided between the locking blade 10 and the sickle-shaped extractor 5. An elastic pull rod 16 is fixed between the striking ball 17 and the sickle-shaped extractor 5. The striking ball 17 is positioned above the elastic capsule 11. During operation, after the locking blade 10 moves to the point where the limiting block 12 is engaged in the slot 14, there is still a distance between the locking blade 10 and the sickle-shaped extractor 5. It should be noted that this distance is greater than the diameter of the striking ball 17. Therefore, during the subsequent striking process using the sliding hammer 2, the striking ball 17 will pull the elastic pull rod 16 back and forth under the action of inertial force. The bouncing of the striking ball 17 will strike the sickle-shaped extractor 5 and the locking blade 10, thereby further promoting the locking blade 10 to engage in the gap between the tibia and the tibia support.

[0038] like Figures 4 to 5 As shown, a sponge pad 15 is fixed inside the locking blade 10 and outside the exhaust pipe. During operation, when the locking blade 10 is inserted between the tibia and the tibia support, after the locking blade 10 stops blowing air, the sponge pad 15 inside the locking blade 10 will absorb excess human synovial fluid, further preventing slippage caused by excessive synovial fluid and protecting the patient.

[0039] like Figure 5 As shown, a positioning block 23 is fixed inside the sponge pad 15. An expansion column 22 is fixed on the side of the positioning block 23 near the center of the snap-fit ​​blade 10. A support frame 21 is fixed outside the expansion column 22. The support frame 21 is slidably connected to the positioning block 23. Liquid absorption grooves are opened on the outside of the support frame 21 and on both sides of the expansion column 22. During operation, after the excessive synovial fluid is absorbed by the sponge pad 15, some of it will slide along the positioning block 23 and the support frame 21 into the washing liquid groove, and will eventually be absorbed by the expansion column 22. After absorbing the synovial fluid, the expansion column 22 will expand to a certain extent, thereby pushing the positioning block 23 to slide out of the support frame 21. The sliding positioning block 23 will push the tibia and tibial support, thereby further improving the separation efficiency of the tibia and tibial support.

[0040] like Figure 5 As shown, an arc-shaped spring ring 20 is fixed to the outside of the support frame 21 and to the bottom side of the liquid absorption groove. The arc-shaped spring ring 20 fits against the inner wall of the exhaust pipe and bends towards the positioning block 23. During operation, the design of the arc-shaped spring ring 20 can block excessive slurry, preventing slurry from entering the exhaust and making it inconvenient for later cleaning and disinfection. When the elastic bladder 11 is compressed and exhausts, the interior of the exhaust pipe is large, so the arc-shaped spring ring 20 can bend normally, allowing the exhaust to proceed normally.

[0041] like Figure 5As shown, a sliding plug 18 is provided on the side of the exhaust pipe away from the elastic bladder 11. A guide groove is provided inside the locking blade 10 and between the sliding plug 18 and the exhaust pipe. A puncture needle 19 is fixed on the side of the sliding plug 18 away from the exhaust pipe. Both the sliding plug 18 and the puncture needle 19 are slidably connected to the locking blade 10. During operation, it should be noted that due to the presence of synovial fluid, negative pressure cavities formed by the fluid film and the tibia and tibia support may appear at some joints, which is not conducive to the separation operation. During the process of the elastic bladder 11 being pressurized and expelling gas, the sliding plug 18 will also slide under the action of air pressure, thereby pushing the puncture needle 19. The puncture needle 19 extends from the inner edge of the 10 and can effectively puncture the negative pressure water film between the tibia and the tibial support, releasing the negative pressure to facilitate separation. At the same time, during the reciprocating motion of the striking ball 17, it will collide with the elastic capsule 11 and cause it to deform to a certain extent. At this time, the deformation of the elastic capsule 11 is small, and the gas discharged is effective and cannot push the arc-shaped spring ring 20 to bend. This small gas pressure will reciprocate to push the sliding plug 18 to slide. The sliding plug 18 drives the puncture needle 19 to reciprocate and extend, thereby further puncturing the water film between the tibia and the tibial support, releasing the negative pressure, and facilitating the separation operation.

[0042] like Figure 4 and Figure 6 As shown, a hollow rod 26 is provided inside the elastic bladder 11. A pair of support rods 25 are slidably connected inside the hollow rod 26. The ends of the pair of support rods 25 that are far apart from each other are fixedly connected to the exhaust nozzles 24. A hollow plug 27 is fixed inside the sickle-shaped extractor 5. The hollow plug 27 is adapted to the exhaust nozzle 24 on the side near the sickle-shaped extractor 5. A one-way valve is installed inside the hollow plug 27. During operation, when the elastic bladder 11 is compressed, the support rods 25 inside it will slide along the hollow rod 26, thereby controlling the contraction direction of the elastic bladder 11. Before the elastic bladder 11 is deformed by pressure, the exhaust nozzle 24 on the side near the hollow plug 27 will first contact the hollow plug 27 and be blocked by the hollow plug 27, so that the gas inside the elastic bladder 11 can only be discharged through the exhaust pipe, thus facilitating the blowing operation.

[0043] like Figure 6As shown, an air replenishment groove is provided inside the sickle-shaped extractor 5, on the side of the hollow plug 27 away from the exhaust port 24. Multiple arc-shaped spring pieces 29 are fixed to both sides of the inner wall of the air replenishment groove. A liquid storage ball 28 is fixed to the end of each arc-shaped spring piece 29 away from the sickle-shaped extractor 5. The liquid storage ball 28 stores alcohol, and a drain hole is provided at the top of the liquid storage ball 28. During operation, after separating the patient's tibia and tibial support, the device needs to be reset for subsequent use. During reset, a magnet is manually used to attract the iron block inside the limiting block 12, causing the storage spring 13 to contract. Then, sterile gas is replenished into the equipment through the gas replenishment tank until the equipment is completely reset. During this process, by changing the flow rate of the sterile gas, the airflow causes the liquid storage ball 28 to pull the arc-shaped spring 29 and bounce back and forth. During the bouncing process, the liquid storage ball 28 will discharge the alcohol stored inside. The discharged alcohol is introduced into the equipment along with the gas, thus automatically cleaning the equipment during the reset process. It should be noted that after the equipment is completely reset, the sterile gas needs to be maintained for a period of time so that the gas can be discharged through the exhaust pipe to clean the inside of the equipment in an all-round way.

[0044] Working principle: The patient is first anesthetized. A longitudinal incision is made in the anterior midline to expose the newly replaced artificial knee joint. The posterior extractor is inserted from both sides of the knee joint. The blade of the sickle-shaped extractor 5 is positioned between the posterior gap of the tibia and the tibial support. Then, the anterior extractor is used, with the blade of the curved single-blade 7 positioned between the anterior gap of the tibia and the tibial support. The sliding hammer 2 on the posterior extractor is then manually pulled to slide on the connecting rod 1 until it impacts the impact block 3, achieving a striking effect. At this point, the sickle-shaped extractor 5 will engage between the tibia and the tibial support, causing a certain degree of separation. Simultaneously, the side of the tibia and the tibial support away from the sickle-shaped extractor 5 will close together, locking the curved single-blade 7. The position of the fastening bolt 9 is then adjusted by rotating the mounting bracket 8. After the fastening bolt 9 is matched with the threaded hole on the fixing rod 4 and the sickle-shaped extractor 5, rotate the fastening bolt 9 until it is inserted into the threaded hole on the fixing rod 4 and the sickle-shaped extractor 5, thereby fixing the front extractor and the rear extractor into one unit. Then, manually pull the sliding hammer 2 on the front extractor to make it slide on the connecting rod 1 and knock it to further separate the tibia and tibial support. Repeat this knocking with the front extractor and the rear extractor until the tibia and tibial support are separated. This device is simple to use and has a built-in knocking structure. At the same time, the sickle design can effectively extend the device into the posterior side of the tibia and tibial support, avoiding damage to the tibial bone and the ligaments on both sides. This achieves the effect of facilitating the separation of the tibial support and the tibia, reducing the operation time, and avoiding damage to the tibial bone and the ligaments on both sides.

[0045] During the installation of the sickle-shaped extractor 5, the locking blade 10 needs to be aligned with the gap between the patient's tibia and tibial support. Then, the fixing rod 4 is pulled to move the sickle-shaped extractor 5. At this time, the locking blade 10 will slide inside the sickle-shaped extractor 5, thereby pushing the elastic capsule 11 to move until it is squeezed. After being squeezed, the elastic capsule 11 will generate airflow. This airflow will be injected into the exhaust pipe through the exhaust nozzle 24 and finally blown out through the exhaust pipe. It should be noted that there is synovial fluid between normal human joints, which is secreted by the synovial membrane of the joint and plays a role in lubricating the joint. The blown airflow will blow away the synovial fluid between the surface of the locking blade 10 and the gap between the tibia and tibial support, thereby preventing slippage during installation and causing injury.

[0046] It should be noted that the initial state of the energy storage spring 13 is compressed. During the sliding of the locking blade 10, it will simultaneously drive the locking groove 14 to move. When the locking groove 14 moves to the point where its axis is on the same straight line as the axis of the limiting block 12, the elastic potential energy of the energy storage spring 13 is released, thereby pushing the limiting block 12 into the locking groove 14. At this time, the locking blade 10 and the sickle-shaped extractor 5 can be fixed as a whole, which facilitates the subsequent knocking and separation work. In addition, during the process of the energy storage spring 13 driving the limiting block 12 to pop out, the energy storage spring 13 will simultaneously knock the locking blade 10, thereby causing the locking blade 10 to vibrate to a certain extent. This vibration can promote the locking blade 10 to be locked into the gap between the tibia and the tibia support.

[0047] After the locking blade 10 moves to the point where the limiting block 12 is engaged in the slot 14, there is still a distance between the locking blade 10 and the sickle-shaped extractor 5. It should be noted that this distance is greater than the diameter of the striking ball 17. As a result, during the subsequent striking process using the sliding hammer 2, the striking ball 17 will pull the elastic lever 16 back and forth under the action of inertial force. The bouncing of the striking ball 17 will strike the sickle-shaped extractor 5 and the locking blade 10, thereby further promoting the locking blade 10 to engage in the gap between the tibia and the tibia support.

[0048] When the locking blade 10 is inserted between the tibia and tibial support, after the locking blade 10 stops blowing air, the sponge pad 15 inside the locking blade 10 will absorb excess synovial fluid, further preventing slippage caused by excessive synovial fluid and protecting the patient. After the excess synovial fluid is absorbed by the sponge pad 15, some of it will slide along the positioning block 23 and the support frame 21 into the washing tank, and will eventually be absorbed by the expansion column 22. After absorbing the synovial fluid, the expansion column 22 will expand to a certain extent, thereby pushing the positioning block 23 out of the support frame 21. The slid-out positioning block 23 will push the tibia and tibial support, thereby further improving the separation efficiency of the tibia and tibial support. The design of the arc-shaped spring ring 20 can block excess synovial fluid, preventing synovial fluid from entering the exhaust vent and making it inconvenient for later cleaning and disinfection. When the elastic capsule 11 is compressed and vented, the interior of the exhaust pipe is large, so the arc-shaped spring ring 20 can bend normally, allowing the exhaust to proceed normally.

[0049] It should be noted that due to the presence of synovial fluid, negative pressure cavities may form at some joints between the tibia and tibial support, which is not conducive to the separation operation. During the process of the elastic bladder 11 being pressurized and releasing gas, the sliding plug 18 will also slide under the action of air pressure, thereby pushing the puncture needle 19 out of the locking blade 10. The extended puncture needle 19 can effectively puncture the negative pressure water film between the tibia and tibial support, releasing the negative pressure and facilitating separation. At the same time, during the reciprocating bounce of the striking ball 17, it will collide with the elastic bladder 11 and cause it to deform to a certain extent. At this time, the deformation of the elastic bladder 11 is small, and the released gas is effective and cannot push the arc-shaped spring ring 20 to bend. At this time, this small part of the air pressure will reciprocate to push the sliding plug 18 to slide. The sliding plug 18 will drive the puncture needle 19 to move back and forth, thereby further puncturing the water film between the tibia and tibial support, releasing the negative pressure and facilitating the separation operation.

[0050] During the compression of the elastic bladder 11, its internal support rod 25 slides along the hollow rod 26, thereby controlling the contraction direction of the elastic bladder 11. Before the elastic bladder 11 deforms under pressure, the exhaust nozzle 24 on the side closest to the hollow plug 27 will first contact the hollow plug 27 and be blocked by it, thus allowing the gas inside the elastic bladder 11 to be discharged only through the exhaust pipe, facilitating the inflatable operation. After separating the patient's tibia and tibial support, the device needs to be reset for the next use. During reset, a magnet needs to be manually used to attract the iron block inside the limiting block 12, thereby activating the stored force. Spring 13 contracts, and then sterile gas is replenished into the equipment through the air replenishment groove until the equipment is completely reset. During this process, by changing the flow rate of sterile gas, the airflow causes the liquid storage ball 28 to pull the arc-shaped spring 29 and bounce back and forth. During the bounce, the liquid storage ball 28 will discharge the alcohol stored inside. The discharged alcohol is introduced into the equipment along with the gas, thus automatically cleaning the equipment during the reset process. It should be noted that after the equipment is completely reset, the sterile gas needs to be maintained for a period of time so that the gas can be discharged through the exhaust pipe to clean the inside of the equipment.

[0051] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0052] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tibial removal device for knee joint revision surgery, characterized in that: Includes a front retrieval assembly and a rear retrieval assembly; The rear-side extraction assembly includes a connecting rod (1), an impact block (3) is fixed to the outside of the connecting rod (1), a fixing rod (4) is fixed to the end of the connecting rod (1) away from the impact block (3), a sliding hammer (2) is slidably connected to the outside of the connecting rod (1) and between the impact block (3) and the fixing rod (4), and a sickle-shaped extractor (5) is bolted to the end of the fixing rod (4) away from the connecting rod (1). Both the fixing rod (4) and the sickle-shaped extractor (5) have multiple threaded holes inside. The front extraction assembly includes a connecting rod (1), an impact block (3) is fixed to the outside of the connecting rod (1), a connecting handle (6) is rotatably connected to the end of the connecting rod (1) away from the impact block (3), an arc-shaped single blade (7) is fixed to the end of the connecting handle (6) near the connecting rod (1), a mounting bracket (8) is fixed to the outside of the connecting rod (1) and above the arc-shaped single blade (7), and a fastening bolt (9) is threadedly connected inside the mounting bracket (8), the fastening bolt (9) is adapted to the threaded holes opened inside the fixing rod (4) and the sickle-shaped extractor (5); The sickle-shaped extractor (5) has a slidingly connected locking blade (10). An elastic bladder (11) is installed inside the locking blade (10) and on the side close to the sickle-shaped extractor (5). Both ends of the elastic bladder (11) are fixed with exhaust nozzles (24). An exhaust pipe is fixed outside the exhaust nozzle (24) on the side away from the sickle-shaped extractor (5). The exhaust pipe is connected to the locking blade (10).

2. The tibial removal device for knee joint revision surgery according to claim 1, characterized in that: The locking blade (10) is externally slidably connected to a limiting block (12), the limiting block (12) is slidably connected to the sickle-shaped extractor (5), a power storage spring (13) is fixed between the limiting block (12) and the sickle-shaped extractor (5), the locking blade (10) is externally provided with a locking groove (14) that matches the limiting block (12), and an iron block is fixed inside the limiting block (12).

3. The tibial removal device for knee joint revision surgery according to claim 1, characterized in that: A striking ball (17) is provided between the snap-fit ​​blade (10) and the sickle-shaped extractor (5), and an elastic pull rod (16) is fixed between the striking ball (17) and the sickle-shaped extractor (5). The striking ball (17) is positioned above the elastic bladder (11).

4. The tibial removal device for knee joint revision surgery according to claim 1, characterized in that: A sponge pad (15) is fixed inside the snap-fit ​​blade (10) and outside the exhaust pipe.

5. The tibial removal device for knee joint revision surgery according to claim 4, characterized in that: A positioning block (23) is fixed inside the sponge pad (15). An expansion column (22) is fixed on the side of the positioning block (23) near the center of the snap-fit ​​blade (10). A support frame (21) is fixed outside the expansion column (22). The support frame (21) is slidably connected to the positioning block (23). Liquid suction grooves are opened on the outside of the support frame (21) and on both sides of the expansion column (22).

6. The tibial removal device for knee joint revision surgery according to claim 5, characterized in that: An arc-shaped spring ring (20) is fixed to the outside of the support frame (21) and to the bottom side of the liquid suction tank. The arc-shaped spring ring (20) is in contact with the inner wall of the exhaust pipe and is bent toward the positioning block (23).

7. The tibial removal device for knee joint revision surgery according to claim 1, characterized in that: A sliding plug (18) is provided on the side of the exhaust pipe away from the elastic bladder (11). A guide groove is provided inside the locking blade (10) and between the sliding plug (18) and the exhaust pipe. A puncture needle (19) is fixed on the side of the sliding plug (18) away from the exhaust pipe. The sliding plug (18) and the puncture needle (19) are slidably connected to the locking blade (10).

8. The tibial removal device for knee joint revision surgery according to claim 1, characterized in that: The elastic bladder (11) is provided with a hollow rod (26), and a pair of support rods (25) are slidably connected inside the hollow rod (26). The ends of the pair of support rods (25) that are far apart from each other are fixedly connected to the exhaust nozzle (24). The sickle-shaped extractor (5) is fixed with a hollow plug (27). The hollow plug (27) is adapted to the exhaust nozzle (24) on the side near the sickle-shaped extractor (5). A one-way valve is installed inside the hollow plug (27).

9. A tibial removal device for knee joint revision surgery according to claim 8, characterized in that: An air replenishment groove is provided inside the sickle-shaped extractor (5) and on the side of the hollow plug (27) away from the exhaust port (24). Multiple arc-shaped spring pieces (29) are fixed on both sides of the inner wall of the air replenishment groove. A liquid storage ball (28) is fixed at the end of the arc-shaped spring piece (29) away from the sickle-shaped extractor (5). The liquid storage ball (28) stores alcohol inside and has a drain hole at the top of the liquid storage ball (28).

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