Biological reverse total ankle prosthesis

Abstract

The application discloses a biological inverted total ankle joint prosthesis and belongs to the technical field of medical prostheses. The biological inverted total ankle joint prosthesis comprises a talus implant, an inner pad and a lock. The bottom of a tibia component is provided with a horizontal slot, the top of the inner pad is provided with a plug-in platform, and the upper surface of the plug-in platform is provided with a lock slot. The plug-in platform of the inner pad is located in the horizontal slot. The top wall of the lock slot and the horizontal slot forms a lock hole with an opening, and the top wall of the horizontal slot in the lock hole is provided with a clamping slot. The lock comprises an elastic lock plate and a plug-in plate. The elastic lock plate is connected with one end of the plug-in plate and has an included angle between the two. The lock is inserted into the lock hole, and the elastic lock plate is clamped in the clamping slot. The locking effect is obviously strengthened, and better bonding strength can be achieved by using the gravity of the human body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical prosthesis, in particular to a biological reverse total ankle joint prosthesis. BACKGROUND

[0002] In the Chinese patent with the publication number CN110856672A, an artificial ankle joint prosthesis assembly is disclosed, the tibial component and the inner block are matched in a tapered manner, but the front side is not locked, which may cause the dislocation in the front-back direction, and the locking strength is low; the talus implant meets the biological characteristics of Asian talus, and the inner block is matched to perform human ankle joint physiological flexion, but the front end of the talus implant does not constrain the displacement of the inner block, which is easy to cause the dislocation of the front end of the inner block; the bone cement is used to fix the bone contact surface of the talus implant and the bone contact surface of the tibial component, which may cause an allergic reaction in patients; the outer side of the tibial component adopts an arc structure, which is complex when performing osteotomy on the tibia, and is easy to cause an increase in the amount of osteotomy. SUMMARY

[0003] Therefore, the present application provides a biological reverse total ankle joint prosthesis. The locking effect of the prosthesis is obviously strengthened, and better bonding strength can be achieved by using the gravity of the human body.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] A biological reverse total ankle joint prosthesis, comprising a talus implant 3 and an inner pad 2, further comprising a lock; the bottom of the tibial component is provided with a horizontal slot, the top of the inner pad is provided with a plug-in platform, and the upper surface of the plug-in platform has a lock slot; the plug-in platform of the inner pad is located in the horizontal slot; the top wall of the lock slot and the horizontal slot forms a lock hole with an opening, and the top wall of the horizontal slot in the lock hole has a clamping slot; the lock comprises a elastic lock plate and a plug-in plate, the elastic lock plate is connected with one end of the plug-in plate and has an included angle therebetween; the lock is inserted into the lock hole, and the elastic lock plate is clamped at the clamping slot.

[0006] Further, the top of the tibial component is provided with a cylindrical column and a fixed column, the wall surface of the cylindrical column is provided with a plurality of small holes, and the fixed column is distributed on the circumferential side of the cylindrical column.

[0007] Further, it further comprises a talus implant 3, which is an arc structure and is movably connected with the bottom of the inner pad.

[0008] Further, the lower surface of the talus implant 3 and the upper surface of the tibial component 1 are 3D printed with trabecular bone structures.

[0009] Further, the front end of the talus implant is provided with a talus implant front tip 5 for preventing falling out, and the talus implant front tip 5 abuts against one side of the inner pad block when the human ankle joint reaches the flexion limit position.

[0010] Further, the joint surface of the inner pad block 2 and the joint surface of the talus implant 3 are in a reverse joint physiological structure.

[0011] Further, the tibial component is a square structure, and the corner of the square structure is provided with a transition arc; the angle of the circular arc angle corresponding to the transition arc is 90-135°.

[0012] The beneficial effects generated by the above technical scheme are as follows:

[0013] 1. The upper surface 8 of the tibial component 1 and the lower surface of the talus implant 3 are 3D printed trabecular bone structures, which are a biological total ankle joint, and the possible allergy caused by bone cement is solved.

[0014] 2. The side surface of the tibial component 1 is expanded to reduce the amount of tibial bone cutting during surgery, and the installation is simple.

[0015] 3. The inner pad block 2 and the tibial component 1 are locked and fixed in the up-down direction through the inner pad block sliding groove 9, and are locked in the front-back direction through the lock catch 4 inserted into the reverse lock to the lock catch slot 10 for front-back locking to prevent falling out.

[0016] 4. The front end of the talus implant 3 is provided with a talus implant front tip 5, and the talus implant front tip 5 performs a restraining action on the inner pad block 2 to prevent the inner pad block 2 from sliding out of the talus implant 3 when the human ankle joint is flexed.

[0017] 5. The joint surface of the inner pad block 2 and the joint surface of the talus implant 3 are in a reverse joint physiological structure, and the better bonding strength is achieved by using the body weight of the human body. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure explosion diagram of the embodiment of the present application;

[0019] Figure 2 It is a structure explosion diagram of the embodiment of the present application;

[0020] Figure 3 It is a structure explosion diagram of the embodiment of the present application;

[0021] Figure 4 It is a structure explosion diagram of the embodiment of the present application;

[0022] Figure 5 It is a structure explosion diagram of the embodiment of the present application;

[0023] In the figure, 1: tibial joint; 2: inner pad; 3: talus implant; 4: lock; 5, talus implant front tip; 6, cylindrical column, 7, fixed column, 8-1, 8-2, trabecular structure; 9, inner pad sliding slot; 10, clamping slot. DETAILED DESCRIPTION

[0024] The application will be further described below in conjunction with the drawings and specific embodiments.

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0026] A biological reverse total ankle joint prosthesis, comprising a talus implant 3 and an inner pad 2, further comprising a lock; the bottom of the tibial component is provided with a horizontal slot, the top of the inner pad is provided with a plug-in platform, and the upper surface of the plug-in platform has a lock slot; the plug-in platform of the inner pad is located in the horizontal slot; the top wall of the lock slot and the horizontal slot forms a lock hole with an opening, and the top wall of the horizontal slot in the lock hole has a clamping slot; the lock comprises a elastic lock plate and a plug-in plate, the elastic lock plate is connected with one end of the plug-in plate and has an included angle between them; the lock is inserted into the lock hole, and the elastic lock plate is clamped at the clamping slot.

[0027] Further, the top of the tibial component is provided with a cylindrical column and a fixed column, the wall surface of the cylindrical column is provided with a plurality of small holes, and the fixed column is distributed on the circumferential side of the cylindrical column.

[0028] Further, it further comprises a talus implant 3, which is an arc structure and is movably connected with the bottom of the inner pad.

[0029] Further, the lower surface of the talus implant 3 and the upper surface of the tibial component 1 are 3D printed with trabecular structures.

[0030] Further, the front end of the talus implant is provided with a talus implant front tip 5 for preventing falling out, and when the human ankle joint reaches the limit of flexion, the talus implant front tip 5 abuts against one side of the inner pad.

[0031] Further, the joint surface of the inner pad 2 and the joint surface of the talus implant 3 are reverse joint physiological structures.

[0032] Further, the tibial component is a square structure, and the corner of the square structure has a transition arc; the angle of the arc opposite to the transition arc is 90°-135°.

[0033] The following is a more specific embodiment:

[0034] Reference Figures 1 to 5 The embodiment is composed of a tibial component 1, an inner block 2, a talus implant 3, a lock 4, a talus implant front tip 5, a cylindrical column 6, a fixed column 7, the tibial component 1 is processed by titanium alloy, the upper surface is processed by 3D printing titanium powder, the inner block 2 is processed by high crosslinking polyethylene, the talus implant 3 is processed by titanium alloy, and the lock 4 is processed by titanium alloy.

[0035] The upper surface 8 of the tibial component 1 and the lower surface of the talus implant 3 are 3D printed trabecular structures, which are a biological total ankle joint and solve the possible allergy caused by bone cement of the patient;

[0036] The tibial component 1 is expanded in the lateral surface, the bone cutting amount of the tibia during the operation is reduced, and the installation is simple; in the embodiment, the circular arc angle is 120°.

[0037] The inner block 2 is locked and fixed in the up-down direction with the tibial component 1 through the inner block sliding groove 9, is locked in the front-back direction by inserting the lock 4 into the reverse lock to the lock clamping groove 10, and is prevented from falling out;

[0038] The talus implant front tip 5 is arranged at the front end of the talus implant 3, the talus implant front tip 5 has a constraint effect on the talus implant 3 when the human ankle joint is flexed, and the inner block 2 is prevented from sliding out of the talus implant 3;

[0039] The joint surface of the inner block 2 and the joint surface of the talus implant 3 are reverse joint physiological structures, and better bonding strength is achieved by using the gravity of the human body.

[0040] When the embodiment is used, the medical process is as follows:

[0041] 1. A surgeon dissects the ankle joint of a patient from the side through a scalpel, exposes the ankle joint, marks the bone cutting amount, and positions the tibia and talus through a bone cutting guide plate to cut the bone;

[0042] 2. According to the positions of the cylindrical column 6 and the fixed column 7 of the tibial component 1, holes are punched, and a trial prosthesis is placed for trial installation, wherein the diameter of the column of the trial prosthesis is 1 mm smaller than that of the implanted prosthesis;

[0043] 3. According to the column position of the talus implant 3, holes are punched, and a trial prosthesis is placed for trial installation, wherein the diameter of the column of the trial prosthesis is 1 mm smaller than that of the implanted prosthesis;

[0044] 4. After the trial is completed, the tibial component 1 is installed on the tibia, the talus implant is installed on the talus, and the inner block is placed, the surgeon manually flexes the ankle joint of the patient, observes whether it meets the physiology of the patient, and selects the appropriate thickness of the inner block;

[0045] 5、Insert the lock 4 into the locking position of the tibial component 1 and the inner block 2, lock, complete the prosthesis assembly;

[0046] 6、Finally, the patient's ankle muscle skin tissue is sutured and bandaged.

Claims

1. A biological reverse total ankle prosthesis comprising a tibial component (1) and an inner block (2), characterized in that, The tibial component is provided with a horizontal slot at the bottom, the top of the inner block is provided with a plug-in platform, and the upper surface of the plug-in platform is provided with a lock slot; the plug-in platform of the inner block is located in the horizontal slot; the top wall of the lock slot and the horizontal slot forms a lock hole with an opening, and the top wall of the horizontal slot in the lock hole is provided with a clamping slot; the lock comprises a elastic lock plate and a plug-in plate, the elastic lock plate (4-1) is connected with one end of the plug-in plate (4-2) and has an included angle therebetween; the lock is inserted into the lock hole, and the elastic lock plate is clamped at the clamping slot; The talus implant (3) is an arc structure and is movably connected with the bottom of the inner block; the tibial component (1) is made of titanium alloy, and the upper surface thereof is made of 3D printed titanium powder; the inner block (2) is made of high cross-linked polyethylene; the talus implant (3) is made of titanium alloy, and the lock (4) is made of titanium alloy; the tibial component is a square structure, and the corners of the square structure are provided with transition arcs; the angle of the arc corresponding to the transition arc is 90°-135°.

2. The biologic reverse total ankle prosthesis of claim 1, wherein, The top of the tibial component is provided with a cylindrical column and a fixed column, the wall surface of the cylindrical column is provided with a plurality of small holes, and the fixed column is distributed on the circumferential side of the cylindrical column.

3. The biologic total reversed ankle prosthesis of claim 1, wherein, The lower surface of the talus implant (3) and the upper surface of the tibial component (1) are 3D printed with trabecular structures.

4. The biologic total reversed ankle prosthesis of claim 1, wherein, The front end of the talus implant is provided with a talus implant front tip (5) for preventing falling out, and when the human ankle joint flexion limit position is reached, the talus implant front tip (5) abuts against one side of the inner block.

5. The biologic total reversed ankle prosthesis of claim 1, wherein, The joint surface of the inner block (2) and the joint surface of the talus implant (3) are reverse joint physiological structures.

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