Split type bionic femoral stem prosthesis

Abstract

The invention relates to a split type bionic femoral stem prosthesis comprising a near-end femoral connecting part and a far-end stem body part, wherein the near-end femoral connecting part is detachably connected to the upper end of the far-end stem body part, the upper end of the near-end femoral connecting part is used for being connected with a near-end femoral marrow cavity, and the lower end of the far-end stem body part is used for being inserted into a far-end femoral marrow cavity, so that a defective femoral section is replaced. The near-end femoral connecting part and the far-end stem body part adopt the split design of threaded connection, so that the structure not only has the anti-rotation effect of a conical connection mode, but also is firmer and more durable than a conical connection mode; and the awkward situation that the far-end stem body part is remained in the femoral far-end medullary cavity and cannot be taken out due to loosening of the conical connection in the prosthesis rebuilding process is avoided.

Description

technical field [0001] The invention relates to an artificial prosthesis, in particular to a split bionic femoral stem prosthesis, which belongs to the technical field of medical devices. Background technique [0002] As the incidence of osteoarthritis and other diseases affecting bones and joints increases, so does the need for total hip replacement (THA). By 2030, it is expected that more than 600,000 people in the country will receive THA each year, which highlights the importance of extending the life of the prosthesis and reducing the risk of prosthesis revision. [0003] Currently, femoral stems have an average useful life of 11.42 years. With the prolongation of life expectancy and the rejuvenation of diseases such as femoral head necrosis, the service life of prostheses of about 10 years can no longer meet the needs of the majority of patients. After the prosthesis fails, revision surgery is required to replace the new prosthesis and continue to serve. For some yo...

AI Technical Summary

Problems solved by technology

[0005] ①The femoral stems designed by most manufacturers are flat, but the shape of the femoral medullary canal after being polished with the medullary canal file is close to an ellipse-like circle; The contact is a point contact (as shown in the figure figure 1 As shown), the resulting result is that before the medullary cavity and the femoral stem are integrated, all the stress is concentrated on the contact point between the stem and the bone, which will cause periprosthetic fractures, wear, bone loss, and osteolysis over time. Serious complications such as prosthesis failure;

[0006] ②The proximal end of the bio-type femoral stem is usually prepared by sandblasting, titanium particle spraying or hydroxyapatite sintering to prepare the so-called bio-coating, which is beneficial to osseointegration, but the bonding force of these coatings is often not ideal, and it often occurs during implantation. There is a phenomenon of coating peeling off, which may promote periprosthetic osteolysis during subsequent use; in addition, these coatings often only prepare irregular convex or groove structures on the surface of the femoral stem, There is no room for deep growth through the bone tissue, so this osseointegration is not considered ideal;

[0007] ③Currently, the available models of femoral stems in clinical use are limited, which cannot meet the needs of all patients. The femoral medullary cavity of patients has various shapes. This type of patients can only accommodate the relatively narrow distal femoral medullary canal and choose a small femoral stem prosthesis, which brings problems that the press-fitting effect of the proximal femur is not good, and the initial stability of the prosthesis is poor; Insufficient bone contact at the end, and the effect of long-term osseointegration is not ideal

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