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Unicompartmental knee joint prosthesis and manufacturing method thereof

A knee joint prosthesis and manufacturing method technology, applied in knee joints, prostheses, elbow joints, etc., can solve the problems of low friction coefficient, poor initial stability, affecting fatigue performance, etc., and achieve increased specific surface area and friction coefficient. , Improve the effect of stable performance

Pending Publication Date: 2021-03-12
天衍医疗器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Most non-cemented prostheses are coated, with poor initial stability and low coefficient of friction;
[0005] 2. The revision rate of cemented unicondylar knee prosthesis is high;
[0006] 3. Although the additively manufactured knee prosthesis can produce a porous structure, bone tissue can grow into the micropores of the prosthesis, which is conducive to the long-term stability of the prosthesis, but the additively manufactured unicondylar knee prosthesis , subject to the influence of additive manufacturing technology, its compactness is difficult to reach 100%, thus affecting its fatigue performance;
[0007] 4. The contact surface between the additively manufactured unicondylar knee prosthesis and the host bone is a porous structure, but the material itself is still a biologically inert material, which cannot achieve the functions of osteoinduction and osseointegration, and has no biological activity

Method used

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  • Unicompartmental knee joint prosthesis and manufacturing method thereof
  • Unicompartmental knee joint prosthesis and manufacturing method thereof
  • Unicompartmental knee joint prosthesis and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] S1. Additive manufacturing of femoral condyle: using cobalt-chromium-molybdenum alloy as raw material and laser three-dimensional forming technology to print, the shape of the No. 1 porous structure is cubic structure, the thickness is 2mm, the porosity is 60%, the wire diameter is 350μm, and the pore size is 500μm femoral condyle;

[0056] S2. HIP treatment of femoral condyle: heat treatment of the femoral condyle obtained in S1, the pressure is kept at 120MPa, the pressure is maintained for 3h, and the HIP temperature is kept at 1170℃;

[0057] S3. Machining the femoral condyle: processing the heat-treated femoral condyle to the designed size;

[0058] S4. Additive manufacturing of tibial plateau: Ti-6Al-17Nb is used as raw material to print the tibial plateau to obtain No. 1 porous structure with a cubic structure, a thickness of 1.5 mm, a porosity of 60%, a wire diameter of 350 μm, and a pore diameter of 350 μm. 500μm femoral condyle;

[0059] S5. HIP treatment of...

Embodiment 2

[0068] S1. Additive manufacturing of femoral condyle: using cobalt-chromium-molybdenum alloy as raw material and selective laser sintering technology to print, the shape of the porous structure No. 1 is a rhombic dodecahedron structure, the thickness is 1mm, the porosity is 50%, and the wire diameter is 200μm, the pore size is 400μm femoral condyle;

[0069] S2. HIP treatment of femoral condyle: heat treatment of the femoral condyle obtained in S1, the pressure is kept at 120MPa, the pressure is maintained for 2h, and the HIP temperature is kept at 1150°C;

[0070] S3. Machining the femoral condyle: processing the heat-treated femoral condyle to the designed size;

[0071] S4. Additive manufacturing of tibial plateau: Ti-13Nb-13Zr is used as raw material to print the tibial plateau, and the shape of the porous structure No. 1 is a rhombic dodecahedron structure, the thickness is 1mm, the porosity is 50%, and the wire diameter is 200μm , with a pore size of 400 μm femoral cond...

Embodiment 3

[0081] S1. Additive manufacturing of femoral condyle: using cobalt-chromium-molybdenum alloy as raw material and electron beam melting technology to print, the shape of the No. 1 porous structure is a truncated octahedron structure, the thickness is 3mm, the porosity is 70%, and the wire diameter is 500μm , with a pore size of 600 μm femoral condyle;

[0082] S2. HIP treatment of femoral condyle: heat treatment of the femoral condyle obtained in S1, the pressure is kept at 120MPa, the pressure is maintained for 4h, and the HIP temperature is kept at 1200°C;

[0083] S3. Machining the femoral condyle: processing the heat-treated femoral condyle to the designed size;

[0084] S4. Additive manufacturing of the tibial plateau: using Ti-5Zr-3Mo-15Nb as the raw material to print the tibial plateau, the shape of the porous structure No. 1 is trabecular bone structure, the thickness is 2mm, the porosity is 70%, and the wire diameter is 500μm, the pore size is 600μm femoral condyle; ...

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Abstract

The invention discloses a unicompartmental knee joint prosthesis and a manufacturing method thereof. The unicompartmental knee joint prosthesis comprises a femur condyle, a gasket and a tibial plateau, wherein a first porous structure is arranged on the inner surfaces, making contact with a host bone, of a femur connecting column and a femur condyle body, and a second porous structure is arrangedon the surfaces, making contact with the host bone, of a tibia connecting column and the tibial plateau body. The invention discloses a manufacturing method of the unicompartmental knee joint prosthesis. The manufacturing method comprises the steps of S1, additive manufacturing of a femur condyle, S2, hot isostatic pressing treatment of the femur condyle, S3, machining of the femur condyle, S4, additive manufacturing of a tibial plateau, S5, hot isostatic pressing treatment of the tibial plateau, S6, machining of the tibial plateau and S7, surface modification. According to the invention, theporous structure provides space for ingrowth of human bone tissue so as to improve stability of the prosthesis; the tibial plateau is endowed with a bioactive function through the in-situ membrane layer, so that bone induction and bone ingrowth of the tibial plateau can be rapidly achieved in the early stage of implantation; and the prosthesis is endowed with good mechanical properties through thehot isostatic pressing process, so that long-term safety and effectiveness of the prosthesis are facilitated.

Description

technical field [0001] The invention relates to the technical field of knee joint prosthesis replacement, in particular to a unicondylar knee joint prosthesis and a manufacturing method thereof. Background technique [0002] At present, most of the unicondylar knee prostheses are cemented prostheses. For cemented unicondylar knee prostheses, aseptic loosening due to poor fixation of bone cement is a common cause of failure. Non-cemented unicondylar prosthesis fixation with screw fixation or rough surface fixation can increase the reliability of knee joint prosthesis fixation, reduce the incidence of aseptic loosening and the rate of misdiagnosis, but the use of loosening leads to early to mid-term revision rates. up to 20%. [0003] The existing unicondylar knee prostheses have the following problems: [0004] 1. Most non-cemented prostheses are coatings, with poor initial stability and low friction coefficient; [0005] 2. The revision rate of cemented unicondylar knee p...

Claims

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Application Information

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IPC IPC(8): A61F2/38
CPCA61F2/38A61F2/3836A61F2002/3097A61F2002/30985A61F2310/00023A61F2310/00029A61F2310/00407
Inventor 魏崇斌王健王安虎毛联甲刘昆玺闵信群孟德松
Owner 天衍医疗器材有限公司
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