A shaft center type knee joint prosthesis

Abstract

The application discloses a shaft core type knee joint prosthesis and belongs to the technical field of artificial prosthesis. The knee joint prosthesis comprises a femoral condyle prosthesis and a tibial plateau support, and further comprises a tee joint structure. The top end of the femoral condyle prosthesis is connected with a bone cutting segment through taper cooperation, and the joint end of the femoral condyle prosthesis is provided with a transversely penetrating shaft hole. The top center of the tibial plateau support is fixed with a counterbore. One end of the tee joint structure is located in the counterbore. The other two opposite ends of the tee joint structure are located in the shaft hole of the femoral condyle prosthesis. The top of the tibial plateau support is provided with a tibial plateau pad corresponding to the joint end surface of the femoral condyle prosthesis. The joint end surface of the femoral condyle prosthesis is located on the upper surface of the tibial plateau pad. The adaptability and stability of the knee joint prosthesis are significantly increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artificial prosthesis, in particular to a shaft type knee joint prosthesis. BACKGROUND

[0002] The femoral condyle and tibial platform support in the existing prosthesis contact and make a "dang dang" sound, increasing wear. And only from the outside can be operated, the fixed part is divided into a central shaft and a compression screw, which needs to be installed from both sides, which brings inconvenience to some special people, increases the difficulty of the operation of the doctor and the incision area. The femoral condyle part is divided into a condyle and a condyle sleeve, which is complicated to install during the operation, and the polyethylene material condyle sleeve appears wear and tear, which may shake and affect the patient's activity. SUMMARY

[0003] The purpose of the present application is to solve the technical defects in the background art, and for this purpose, the present application proposes a shaft type knee joint prosthesis.

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

[0005] A shaft type knee joint prosthesis, comprising a femoral condyle prosthesis and a tibial platform support, further comprising a tee structure; the top end of the femoral condyle prosthesis is connected with the osteotomy segment through taper fitting, and the joint end of the femoral condyle prosthesis is provided with a transverse through shaft hole; the top center of the tibial platform support is fixed with a counterbore; one end of the tee structure is located in the fixed counterbore; the other two opposite ends of the tee structure are located in the shaft hole of the femoral condyle prosthesis; the top of the tibial platform support is provided with a tibial platform pad corresponding to the joint end surface of the femoral condyle prosthesis; and the joint end surface of the femoral condyle prosthesis is located on the upper surface of the tibial platform pad.

[0006] Further, the condyle of the femoral condyle prosthesis is provided with a vertical groove; the shaft hole on the left side of the vertical groove is a left shaft hole, and the shaft hole on the right side of the vertical groove is a right shaft hole; the top of the tee structure is located in the vertical groove, and the two opposite ends extend into the left shaft hole and the right shaft hole respectively.

[0007] Further, the center position of the tibial platform pad is provided with a through hole opposite to the fixed counterbore.

[0008] Further, it further comprises a central shaft; the two opposite ends of the tee structure are provided with through holes; the central shaft is located in the through hole; and the two ends of the central shaft extend out of the through hole and are connected with the inner wall of the shaft hole.

[0009] Further, the inner wall of the two ends of the shaft hole is provided with a recess; one end of the central shaft has a protrusion for embedding in the recess; the protrusion is located in the corresponding recess, and the central shaft and the femoral condyle prosthesis are relatively stationary.

[0010] Further, the other end of the shaft hole is provided with a detachable compression pad; the side wall of the compression pad is provided with a second protrusion, and the center of the compression pad coincides with the central axis of the central shaft; and the second protrusion is located in the corresponding notch.

[0011] Further, a three-way pad is further included, the intercondylar is further provided with a vertical fixing hole, and the opening of the fixing hole faces downward; the three-way pad is a stepped structure; the bottom of the stepped structure is provided with a fixing column; the stepped structure is installed in an inverted manner on the intercondylar, and the fixing column is located in the fixing hole; when the femoral condyle prosthesis and the tibial platform support are on the same vertical line, the tail of the three-way structure abuts against the stepped structure.

[0012] Further, the diameter of the bottom of the fixing hole is greater than that of the opening position; and the end of the fixing column is provided with a barb structure for clamping in the bottom of the fixing hole.

[0013] Further, the side wall of the compression pad is provided with a barb structure for clamping the inner wall of the shaft hole; the central shaft is provided with a threaded hole penetrating along the central axis, and the compression pad is provided with a straight hole corresponding to the threaded hole.

[0014] Further, the intercondylar side of the left shaft hole and the right shaft hole is provided with a central shaft pad.

[0015] Compared with the prior art, the scheme has the following beneficial effects:

[0016] 1. The protrusions on the compression pad and the central shaft as anti-rotation structures are used for preventing disengagement and rotation, and stability is increased.

[0017] 2. The femoral condyle is designed as an inner taper, so that the bone cutting size can be reduced during surgery and preoperative planning, the bone cutting length can be as small as possible, and the bone cutting length can be better matched during assembly.

[0018] 3. The central shaft is provided with a threaded hole, so that the instrument can be screwed into the threaded hole to take out the central shaft and the compression pad together during revision, and the taking out is convenient and the postoperative replacement is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the application.

[0020] Figure 2 It is a left view of the application. Figure 1

[0021] Figure 3 It is a right view of the application. Figure 1

[0022] Figure 4 It is a sectional view of B-B of the application. Figure 1

[0023] ​​​Figure 5 for Figure 1 A schematic diagram of the structure of the mid-femoral condyle prosthesis.

[0024] Figure 6 for Figure 1 A schematic diagram of the structure of a T-junction gasket.

[0025] Figure 7 for Figure 6 Side view.

[0026] Figure 8 for Figure 1 A schematic diagram of the middle tee structure.

[0027] Figure 9 for Figure 1 A schematic diagram of the central axis structure.

[0028] Figure 10 for Figure 1 A schematic diagram of the structure of the medium-pressure pad.

[0029] Figure 11 for Figure 10 A schematic diagram of the side structure.

[0030] In the diagram: 1. Femoral condyle prosthesis, 2. Tibial plateau support, 4. Central axis, 5. T-junction structure, 6. Tibial plateau pad, 7. Osteotomy segment, 8. Central axis pad, 9. Compression pad, 10. T-junction pad, 11. Barbed structure. Detailed Implementation

[0031] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0032] Reference Figures 1 to 11 This embodiment discloses an axial knee joint prosthesis, including a femoral condyle prosthesis and a tibial plateau support, as well as a three-way connector. The top of the femoral condyle prosthesis is connected to the osteotomy segment via a conical fit, and the joint end of the femoral condyle prosthesis has a transversely penetrating axial hole. The top center of the tibial plateau support has a fixed countersunk hole. One end of the three-way connector is located in the fixed countersunk hole. The other two opposite ends of the three-way connector are located in the axial hole of the femoral condyle prosthesis. The top of the tibial plateau support has a tibial plateau pad corresponding to the joint end face of the femoral condyle prosthesis. The joint end face of the femoral condyle prosthesis is located on the upper surface of the tibial plateau pad.

[0033] It also includes a central shaft; the two opposite ends of the three-way structure are provided with through holes; the central shaft is located in the through holes; the two ends of the central shaft extend out of the through holes and are connected to the inner wall of the shaft hole.

[0034] The femoral condyle prosthesis is provided with a vertical slot between the condyles; the left shaft hole is on the left side of the vertical slot, and the right shaft hole is on the right side of the vertical slot; the top of the tee structure is located in the vertical slot, and the two opposite ends extend into the left shaft hole and the right shaft hole respectively.

[0035] The tibial platform pad is provided with a through hole opposite to the fixed hole at the center position.

[0036] The inner wall of both ends of the shaft hole is provided with a notch; one end of the middle shaft has a protrusion for embedding the notch; the protrusion is located in the corresponding notch, and the middle shaft and the femoral condyle prosthesis are relatively stationary. The other end of the shaft hole is provided with a detachable compression pad; the side wall of the compression pad is provided with a second protrusion, and the center of the compression pad coincides with the central axis of the middle shaft; the second protrusion is located in the corresponding notch.

[0037] The embodiment also includes a tee pad, and the intercondylar region is also provided with a vertical fixed hole with the opening downward; the tee pad is a stepped structure; the bottom of the stepped structure is provided with a fixed column; the stepped structure is installed in the intercondylar region in an inverted manner, and the fixed column is located in the fixed hole; when the femoral condyle prosthesis and the tibial platform holder are on the same vertical line, the tail of the tee structure abuts against the stepped structure.

[0038] The diameter of the bottom of the fixed hole is larger than that of the opening position; the end of the fixed column is provided with a barb structure for clamping in the bottom of the fixed hole. The side wall of the compression pad is provided with a barb structure for clamping the inner wall of the shaft hole; the middle shaft is provided with a threaded hole penetrating along the central axis, and the compression pad is provided with a straight hole corresponding to the threaded hole. The intercondylar side of the left shaft hole and the right shaft hole is provided with a middle shaft pad.

[0039] In the embodiment, the tee pad and the compression pad are made of polyethylene, the middle shaft and the tee structure are made of titanium alloy, and the femoral condyle prosthesis is made of cobalt-chromium-molybdenum. When the tee structure rotates with the tibia after implantation, the contact with the tee pad will reduce the sound.

[0040] A threaded hole is added to the middle of the middle shaft cap to facilitate revision and removal, and then the barb of the compression pad is compressed. Since there are barb grooves of the compression pad on both sides of the femoral condyle, the middle shaft can be installed on either side of the femoral condyle.

[0041] The tee pad structure is changed in this embodiment. The polyethylene of the original tee pad is thickened, and the original tee pad structure is changed. The tee pad is designed in a dovetail shape, and a barb groove is added to the bottom to reduce the "click" sound, reduce wear, prevent dislocation, and be more stable while facilitating production and surgery.

[0042] The barb groove of the compression pad is installed on both sides of the whole condyle, so the middle shaft can be installed on either side. The femoral condyle is now replaced by the whole condyle, which does not wear and is more stable.

Claims

1. A shaft center type knee joint prosthesis comprising a femoral condyle prosthesis and a tibial plate, characterized in that; The three-way structure is further provided; the top end of the femoral condyle prosthesis is connected with the osteotomy segment through a taper fit, and the joint end of the femoral condyle prosthesis is provided with an axial hole penetrating in the transverse direction; the top center of the tibial platform support is provided with a fixed counterbore; one end of the three-way structure is located in the fixed counterbore; the other two opposite ends of the three-way structure are located in the axial hole of the femoral condyle prosthesis; the top of the tibial platform support is provided with a tibial platform pad corresponding to the joint end surface of the femoral condyle prosthesis; and the joint end surface of the femoral condyle prosthesis is located on the upper surface of the tibial platform pad. The three-way pad is further provided; the intercondylar of the femoral condyle prosthesis is further provided with a vertical fixed hole, and the opening of the fixed hole faces downward; the three-way pad is a stepped structure; the bottom of the stepped structure is provided with a fixed column; the stepped structure is installed in the intercondylar in an inverted manner, and the fixed column is located in the fixed hole; when the femoral condyle prosthesis and the tibial platform support are located on the same vertical line, the tail of the three-way structure abuts against the stepped structure. The diameter of the bottom of the fixed hole is greater than that of the opening position; the end of the fixed column is provided with a barb structure for clamping in the bottom of the fixed hole. The three-way pad is made of polyethylene.

2. A unicondylar knee prosthesis according to claim 1, wherein, The intercondylar of the femoral condyle prosthesis is provided with a vertical groove; the axial hole on the left side of the vertical groove is a left axial hole, and the axial hole on the right side of the vertical groove is a right axial hole; the top of the three-way structure is located in the vertical groove, and the two opposite ends extend into the left axial hole and the right axial hole, respectively.

3. A unicondylar knee prosthesis according to claim 1, wherein, The tibial platform pad is provided with a through hole opposite to the fixed counterbore at the center position.

4. The axial knee prosthesis of claim 1, wherein, The three-way structure is further provided; the top end of the femoral condyle prosthesis is connected with the osteotomy segment through a taper fit, and the joint end of the femoral condyle prosthesis is provided with an axial hole penetrating in the transverse direction; the top center of the tibial platform support is provided with a fixed counterbore; one end of the three-way structure is located in the fixed counterbore; the other two opposite ends of the three-way structure are located in the axial hole of the femoral condyle prosthesis; the top of the tibial platform support is provided with a tibial platform pad corresponding to the joint end surface of the femoral condyle prosthesis; and the joint end surface of the femoral condyle prosthesis is located on the upper surface of the tibial platform pad.

5. A unicondylar knee prosthesis according to claim 4, wherein, The left axial hole and the right axial hole are provided with a middle shaft pad on the intercondylar side.

6. A unicondylar knee prosthesis according to claim 4, wherein, The bottom of the fixed hole is provided with a recess; one end of the middle shaft has a protrusion for embedding in the recess; the protrusion is located in the corresponding recess, and the middle shaft and the femoral condyle prosthesis are relatively stationary.

7. The axial knee joint prosthesis according to claim 6, characterized in that, The other end of the axial hole is provided with a detachable compression pad; the side wall of the compression pad is provided with a second protrusion, and the center of the compression pad coincides with the middle axis of the middle shaft; the second protrusion is located in the corresponding recess.

8. A unicondylar knee prosthesis according to claim 2, wherein, The side wall of the compression pad is provided with a barb structure for clamping the inner wall of the axial hole; the middle shaft is provided with a threaded hole penetrating along the middle axis, and the compression pad is provided with a straight hole corresponding to the threaded hole. The left axial hole and the right axial hole are provided with a middle shaft pad on the intercondylar side.

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