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Artificial femoral prosthesis

A femoral prosthesis and artificial technology, applied in the field of hip joint prosthesis, can solve the problems of unequal length of the two lower limbs, aggravate the stress shielding of the stem, and achieve the effects of preventing osteolysis, preventing excessive subsidence, and increasing stability

Inactive Publication Date: 2010-11-24
孙瑞财
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The femoral stem with a collar structure can effectively prevent the prosthesis from subsidence, avoid disuse osteoporosis on the osteotomy surface, and ensure the position of the center of rotation of the prosthesis, but the distal end of the stem is prone to loosening and swinging, which intensifies the stress on the stem The femoral stem with collarless structure can sink automatically after the prosthesis is implanted to ensure the tight fit between the prosthesis and the medullary cavity, which can effectively ensure the stability of the femoral stem after implantation. long-term stability, but disuse osteoporosis is prone to occur on the osteotomy surface, and excessive subsidence will lead to unequal lengths of the lower limbs

Method used

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Embodiment Construction

[0011] The operation process of the artificial femoral prosthesis of the present invention is similar to the existing hip joint operation process, in which the skin is cut and the femoral head is sawed off, and the marrow is reamed. Implant the outer sleeve (3) into the medullary cavity of the femur (4), then fill the position of the bone graft block (2) with autologous bone or allogeneic bone or bone cement or other materials, and place the femoral stem (1) Insert the bone graft block (2) and the outer sleeve (3), and the treatment is completed.

[0012] When the artificial hip joint prosthesis is stressed, the stress is transmitted from the collar of the femoral stem (7) to the proximal end of the femur (4) and the bone graft block (2), and then to the distal end of the femur. That is to say, the stress transfer mode of the prosthesis and the femur in parallel connection in the prior art is transformed into the mode of serially bearing the stress transmitted from the collar ...

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Abstract

The invention discloses an artificial femoral prosthesis, which consists of a femoral stem (1), bone grafts (2) and an outer sleeve (3). Particularly, the outer sleeve (3) is implanted into the medullary space of femora (4); a femoral stem far end (5) is inserted into an outer sleeve track (6); and the gap between the outer sleeve (3) and the femora (4) is filled with the bone grafts (2). The aim of the invention is that: through long term fusion of the femora (4) and the bone grafts (2), the artificial femoral prosthesi bears the stress from a femoral stem collar (7); through the annular design of the outer sleeve track (6), after the femoral stem collar (7) is stressed, inside displacement (8) is smaller than outside displacement (9), so that the stress outside the femora is larger; by controlling the contact position of the outer sleeve track (6) and the femoral stem far end (5), the stress of the femora (4) is distributed close to the natural state; through anatomy covering of the femoral stem collar (7), grains are prevented from entering the bone-prosthesis joint surface; and by changing the shape size of the outer sleeve (3), the artificial femoral prosthesis adapts to different medullary spaces and indications.

Description

technical field [0001] The invention relates to a hip joint prosthesis, especially an artificial femoral prosthesis implanted in the femoral part. Background technique [0002] Artificial hip arthroplasty is widely used clinically and is currently the treatment for severe osteoarthritis, femoral neck intracapsular fracture, rheumatoid arthritis, advanced aseptic necrosis of the femoral head, advanced congenital acetabular dysplasia and acetabular deformity. and so on the most common method. It has many advantages such as relieving joint pain, restoring joint function, maintaining joint stability and not affecting or repairing the length of limbs. It has become an effective means of treating severe hip joint lesions. [0003] The existing technology of artificial hip joint prosthesis is usually to imitate the structure of the human hip joint, insert the prosthesis handle into the femoral medullary cavity, and use the head to rotate with the socket or the metal cup of the pro...

Claims

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Application Information

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IPC IPC(8): A61F2/36A61L27/04A61L27/02
CPCA61F2/36A61F2002/30001
Inventor 孙瑞财
Owner 孙瑞财
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