Auxiliary device for artificial knee joint replacement

Abstract

The auxiliary device comprises a bottom plate, an angle adjusting mechanism and hollowed-out slide ways, a left side plate and a right side plate are arranged on the two sides of the bottom plate, the hollowed-out slide ways are symmetrically arranged on the left side plate and the right side plate, and the angle adjusting mechanism is arranged on the left side plate and the right side plate. The angle adjusting mechanism is arranged between the left side plate and the right side plate in a sliding mode through the hollowed-out sliding way. The auxiliary device used in the artificial knee joint replacement is convenient to operate, and the angle is fixed and stable, so that the number of assistants can be reduced, and an operator can finish the knee joint replacement operation by adding one assistant.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to an auxiliary device used in artificial knee replacement surgery. Background Art

[0002] The knee joint is one of the most important joints in the human body. It is the main joint that bears the body's weight. It is the joint with the largest synovial area among all joints in the human body and is also the joint with the most complex anatomical decomposition. At the same time, it is also the joint with the highest incidence rate among all joints. In modern medicine, knee osteoarthritis, knee synovitis, meniscus injury, cruciate ligament rupture, patellar chondromalacia, gouty arthritis, rheumatoid arthritis, psoriatic arthritis, bone tumors, bone infarction, etc. may cause knee pain. Almost all terminal knee diseases (pain, dysfunction, etc.) can be solved by total knee replacement (TKA).

[0003] It is well known that the angle requirements for the knee joint are different in total knee replacement surgery. At present, conventional knee surgery generally requires the cooperation of four people, two of whom are responsible for controlling the angle of the knee joint of the affected limb. The proficiency and accuracy of manual angle control require a lot of surgical experience and tacit cooperation with the surgeon. Otherwise, it is easy to be inconsistent with the precise angle required by the surgeon, especially in the critical few minutes of installing the prosthesis. At the same time, a lot of manpower is required in the process of manual angle fixation. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide an auxiliary device for use in artificial knee replacement surgery, which allows the operator to independently control the knee joint flexion angle during the surgery, is easy to operate, and has a stable and fixed angle.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] An auxiliary device used in artificial knee replacement surgery includes a base plate, a hollow slide and an angle adjustment mechanism, wherein a left side plate and a right side plate are arranged on both sides of the base plate, the hollow slide is symmetrically arranged on the left side plate and the right side plate, and the angle adjustment mechanism is slidably arranged between the left side plate and the right side plate through the hollow slide.

[0007] Furthermore, the angle adjustment mechanism includes a guide shaft connected to the hollow slide, a sleeve shaft sleeved on both ends of the guide shaft, a positioning ring sleeved on the sleeve shaft, a locking piece screwed on the sleeve shaft, and an ankle joint fixing seat installed in the middle of the guide shaft; both ends of the guide shaft are provided with a flat position, and the sleeve shaft is provided with a sleeve hole matching the flat position, and the synchronous rotation of the guide shaft and the sleeve shaft is achieved by sleeve-mounting the flat position in the sleeve hole.

[0008] Further, the sleeve shaft sequentially includes a sleeve, a limiting ring, an annular positioning table and a screwing post. The sleeve hole penetrates through the sleeve, the limiting ring, the annular positioning table and the screwing post, and the positioning ring is sleeved on the annular positioning table.

[0009] Further, a plurality of annular limiting grooves for realizing relative locking of the position of the angle adjusting mechanism are provided on the hollow slideway. When the position of the angle adjusting mechanism is relatively locked, the positioning ring is located in the annular limiting groove.

[0010] Further, a boss is provided between adjacent annular limiting grooves, and the contact surface between the boss and the annular limiting groove is an arc surface.

[0011] Further, an external thread is provided on the outer side of the screwing post, and an internal thread matching with the external thread is provided on the locking member. The screwing post passes through the hollow slideway and is screwed with the locking member, so as to fixedly install the guide shaft between the left side plate and the right side plate.

[0012] Further, a through hole for connecting the guide shaft is provided at the bottom of the ankle joint fixing seat, and a reinforcing rib is further provided along the outside of the through hole at the bottom of the ankle joint fixing seat.

[0013] Further, a screw hole penetrating through the through hole is provided on the reinforcing rib, and a mounting hole corresponding to the screw hole is provided on the guide shaft. The screw hole and the mounting hole are connected through a screw, so as to fix the ankle joint fixing seat on the guide shaft.

[0014] Further, the ankle joint fixing seat is made of medical PVC material, and the bottom plate, the guide shaft, the sleeve shaft, the positioning ring and the locking member are all made of stainless steel material.

[0015] Further, a handle is further provided on the outer side of the locking member.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. The auxiliary device for artificial knee joint replacement operation of the present utility model includes a bottom plate, a hollow slideway and an angle adjusting mechanism. The angle adjusting mechanism slides between the left side plate and the right side plate through the hollow slideway, which is convenient to operate and the angle is fixed stably. Furthermore, the number of assistants can be reduced, and the knee joint replacement operation can be completed by the surgeon plus one assistant.

[0018] 2. The angle adjustment mechanism of the present utility model includes a guide shaft connected to the hollow slideway, sleeve shafts sleeved at both ends of the guide shaft, a positioning ring sleeved on the sleeve shafts, a locking member screwed onto the sleeve shafts, and an ankle joint fixing seat installed in the middle of the guide shaft; flat positions are provided at both ends of the guide shaft, and sleeve holes matching the flat positions are provided on the sleeve shafts. By embedding the flat positions into the sleeve holes, the synchronous rotation of the guide shaft and the sleeve shafts can be achieved, which is convenient for installation, has high stability and strong durability. Unscrew the locking member to adjust the angle of the ankle joint fixing seat. After the angle adjustment is in place, tighten the locking member to fix the adjustment, which is convenient for operation and has stable angle fixation.

[0019] 3. The hollow slideway of the present utility model is provided with an annular limiting groove and a convex platform. The positioning ring is located in the annular limiting groove to realize the relative locking of the position where the ankle joint fixator is located. The convex platform is arranged between adjacent annular limiting grooves to prevent the relative locking failure caused by the excessive force of the patient during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the auxiliary device for artificial knee joint replacement provided by the embodiment of the present utility model;

[0021] Figure 2 is an exploded structural diagram of the angle adjustment mechanism provided by the embodiment of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the ankle joint fixator provided by the embodiment of the present utility model;

[0023] Figure 4 is a left view of the auxiliary device for artificial knee joint replacement provided by the embodiment of the present utility model;

[0024] Figure 5 is Figure 4 a schematic structural diagram of the cross-section A-A in

[0025] Figure 6 is Figure 1 a magnified structural diagram of the C area in

[0026] REFERENCE MARKS:

[0027] 10 - bottom plate; 11 - left side plate; 21 - right side plate;

[0028] 20 - angle adjustment mechanism; 21 - guide shaft; 211 - flat position; 22 - sleeve shaft; 221 - sleeve; 222 - limiting ring; 223 - annular positioning platform; 224 - screw connection post; 225 - sleeve hole; 23 - positioning ring; 24 - locking member; 241 - handle; 25 - ankle joint fixing seat; 251 - through hole; 252 - reinforcing rib; 253 - screw hole;

[0029] 30 - Hollow slideway; 31 - Annular limiting groove; 32 - Boss; 33 - Arc surface. Detailed implementation mode

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the protection scope of the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] As Figures 1 to 6 shown, the embodiment of the present invention provides an auxiliary device for artificial knee joint replacement, including a bottom plate 10, an angle adjustment mechanism 20 and a hollow slideway 30. Left side plates 11 and right side plates 21 are arranged on both sides of the bottom plate 10, and the hollow slideways 30 are symmetrically arranged on the left side plates 11 and the right side plates 21. The angle adjustment mechanism 20 is slidably arranged between the left side plates 11 and the right side plates 21 through the hollow slideways 30.

[0034] As Figures 1 to 5As shown in the figure, in this embodiment, the angle adjustment mechanism 20 includes a guide shaft 21 connected to the hollow slideway 30, sleeve shafts 22 sleeved on both ends of the guide shaft 21, a positioning ring 23 sleeved on the sleeve shafts 22, a locking member 24 screwed onto the sleeve shafts 22, and an ankle joint fixing seat 25 installed in the middle of the guide shaft 21. Both ends of the guide shaft 21 are provided with flat positions 211, and the sleeve shafts 22 are provided with sleeve holes 225 that cooperate with the flat positions 211. By embedding the flat positions 211 into the sleeve holes 225, the synchronous rotation of the guide shaft 21 and the sleeve shafts 22 is achieved.

[0035] In this embodiment, the ankle joint fixing seat 25 is a triangular prism-shaped frame for accommodating the foot and ankle joint. The patient's ankle joint can be fixed to the ankle joint fixing seat 25 through a sterile bandage. A through hole 251 for connecting the guide shaft 21 is provided at the bottom of the ankle joint fixing seat 25, and a reinforcing rib 252 is further provided along the outside of the through hole 251 at the bottom of the ankle joint fixing seat 25. A screw hole 253 penetrating the through hole 251 is provided on the reinforcing rib 252, and the guide shaft 21 is provided with a mounting hole corresponding to the screw hole 253. The screw hole 253 and the mounting hole are connected by a screw, thereby fixing the ankle joint fixing seat 25 to the guide shaft 21.

[0036] In this embodiment, the sleeve shaft 22 sequentially includes a sleeve 221, a limit ring 222, an annular positioning platform 223, and a threaded column 224. The sleeve hole 225 penetrates through the sleeve 221, the limit ring 222, the annular positioning platform 223, and the threaded column 224. The positioning ring 23 is sleeved on the annular positioning platform 223. The outer side surface of the threaded column 224 is provided with an external thread, and the locking member 24 is provided with an internal thread that cooperates with the external thread. The threaded column 224 passes through the hollow slideway 30 and is screwed with the locking member 24, thereby fixedly installing the guide shaft 21 between the left side plate 11 and the right side plate 21.

[0037] In this embodiment, the sleeve shafts 22 are sleeved on both ends of the guide shaft 21, the positioning rings 23 are sleeved on the sleeve shafts 22 at both ends, the locking members 24 are screwed onto the sleeve shafts 22, and the ankle joint fixing seat 25 is installed in the middle of the guide shaft 21. Both ends of the guide shaft 21 are provided with flat positions 211, and the sleeve shafts 22 are provided with sleeve holes 225 that cooperate with the flat positions 211. By embedding the flat positions 211 into the sleeve holes 225, the synchronous rotation of the guide shaft 21 and the sleeve shafts 22 is achieved. The entire angle adjustment mechanism 20 is convenient to install, has high stability and strong durability. The limit ring 222 passes through the hollow slideway 30 and is arranged in the annular limit groove 31. A handle 241 is provided on the outer side of the locking member 24. By turning the handle 241 to unscrew the locking member 24, the angle of the ankle joint fixing seat 25 can be adjusted. After the angle adjustment is in place, the locking member 24 is tightened by turning the handle 241 for angle fixing. The operation is convenient and the angle fixing is stable.

[0038] As Figure 1 and Figure 6As shown, in this embodiment, due to the different ratios of the patient's calf length to thigh length, a plurality of annular limiting grooves 31 for relatively locking the position of the angle adjustment mechanism 20 are provided on the hollow slideway 30. When the position of the angle adjustment mechanism 20 is relatively locked, the positioning ring 23 is located in the annular limiting groove 31. Moving the positioning ring 23 to different annular limiting grooves 31 can adjust the knee to a suitable position for the operation. Then, by adjusting the angle of the angle adjustment mechanism 20, the knee can be presented at the target angle.

[0039] In this embodiment, a boss 32 is further provided between adjacent annular limiting grooves 31. The boss 32 prevents the relative locking from failing due to the patient exerting too much force during the operation. The contact surface between the boss 32 and the annular limiting groove 31 is set as an arc surface 33. When the positioning ring 23 moves through the arc surface 33, it is more labor-saving.

[0040] The auxiliary device of the present utility model for artificial knee joint replacement needs to be sterilized at high temperature before and after the operation. Therefore, the ankle fixing seat 25 is made of medical PVC material, and the bottom plate 10, the guide shaft 21, the sleeve shaft 22, the positioning ring 23 and the locking member 24 are all made of stainless steel material.

[0041] The auxiliary device of the present utility model for artificial knee joint replacement includes a bottom plate 10, a hollow slideway 30 and an angle adjustment mechanism 20. The angle adjustment mechanism 20 is slidably disposed between the left side plate 11 and the right side plate 21 through the hollow slideway 30, which is convenient to operate and the angle is fixed stably. Furthermore, the number of assistants can be reduced, and the knee joint replacement operation can be completed by the surgeon and one assistant.

[0042] The above only expresses the preferred technical solutions of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model also intends to include these changes and modifications.

Claims

1. An auxiliary device for artificial knee replacement, characterized in that: It includes a bottom plate, an angle adjustment mechanism and a hollow slide, wherein a left side plate and a right side plate are arranged on both sides of the bottom plate, the hollow slide is symmetrically arranged on the left side plate and the right side plate, and the angle adjustment mechanism is slidably arranged between the left side plate and the right side plate through the hollow slide.

2. The auxiliary device for artificial knee replacement according to claim 1, characterized in that: The angle adjustment mechanism includes a guide shaft connected to the hollow slide, a sleeve shaft sleeved on both ends of the guide shaft, a positioning ring sleeved on the sleeve shaft, a locking piece screwed on the sleeve shaft, and an ankle joint fixing seat installed in the middle of the guide shaft; both ends of the guide shaft are provided with a flat position, and the sleeve shaft is provided with a sleeve hole matching the flat position, and the synchronous rotation of the guide shaft and the sleeve shaft is achieved by embedding the flat position in the sleeve hole.

3. The auxiliary device for artificial knee replacement according to claim 2, characterized in that: The sleeve shaft comprises a sleeve, a limiting ring, an annular positioning platform and a screw-connecting column in sequence; the sleeve hole passes through the sleeve, the limiting ring, the annular positioning platform and the screw-connecting column; and the positioning ring is sleeved on the annular positioning platform.

4. The auxiliary device for artificial knee replacement according to claim 3, characterized in that: The outer side surface of the screw connection column is provided with an external thread, and the locking member is provided with an internal thread matching the external thread. The screw connection column passes through the hollow slideway and is screwed to the locking member, thereby fixing the guide shaft between the left plate and the right plate.

5. The auxiliary device for artificial knee replacement according to claim 3, characterized in that: The hollow slide is provided with a plurality of annular limiting grooves for realizing relative locking of the position of the angle adjustment mechanism. When the position of the angle adjustment mechanism is relatively locked, the positioning ring is located in the annular limiting groove.

6. The auxiliary device for artificial knee replacement according to claim 5, characterized in that: A boss is provided between adjacent annular limiting grooves, and a contact surface between the boss and the annular limiting groove is configured as an arc surface.

7. The auxiliary device for artificial knee replacement according to claim 2, characterized in that: A through hole for connecting the guide shaft is provided at the bottom of the ankle joint fixing seat, and reinforcing ribs are also provided at the bottom of the ankle joint fixing seat along the outer side of the through hole.

8. The auxiliary device for artificial knee replacement according to claim 7, characterized in that: The reinforcing rib is provided with a screw hole penetrating the through hole, the guide shaft is provided with a mounting hole corresponding to the screw hole, and the screw hole and the mounting hole are connected by screws, so that the ankle joint fixing seat is fixed on the guide shaft.

9. The auxiliary device for artificial knee replacement according to claim 2, characterized in that: The ankle joint fixing seat is made of medical PVC material, and the base plate, guide shaft, sleeve shaft, positioning ring and locking piece are all made of stainless steel material.

10. The auxiliary device for artificial knee replacement according to claim 2, characterized in that: A handle is also provided on the outer side of the locking piece.

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