ARTIFICIAL ALPHA FEMORAL STEM PROSTHESIS

Abstract

The present disclosure provides an artificial alpha femoral stem prosthesis which includes a femoral stem cone, a femoral neck and a stem body connected integratedly, wherein a tool operating hole is arranged at upper end of the the femoral neck; the stem body comprises a proximal segment of the femoral stem, a middle segment of the femoral stem and a distal segment of the femoral stem, and there is a deflection angle between the femoral neck and the stem body.

Claims

1. An artificial alpha femoral stem prosthesis, comprising a femoral stem cone, a femoral neck and a stem body connected integratedly, where a tool operating hole is arranged at upper end surface of the femoral neck, characterized in that the stem body comprises a proximal segment of the femoral stem, a middle segment of the femoral stem and a distal segment of the femoral stem, and there is a deflection angle between the femoral neck and the stem body.

2. The artificial alpha femoral stem prosthesis according to claim 1, characterized in that, the deflection angle between the femoral neck and the stem body is 035, or 145180.

3. The artificial alpha femoral stem prosthesis according to claim 1, characterized in that, the deflection angle between the femoral neck and the stem body is 0, 15 or 35, and a deflection direction is toward left or toward right.

4. The artificial alpha femoral stem prosthesis according to claim 1, characterized in that, an angle between a central line of the stem body and a central line of the femoral neck is 120140.

5. The artificial alpha femoral stem prosthesis according to claim 1, characterized in that, an angle between a central line of the stem body and a central line of the femoral neck is 130.

6. The artificial alpha femoral stem prosthesis according to claim 1, characterized in that, the distal segment of the femoral stem has a structure of high polished bullet.

7. The artificial alpha femoral stem prosthesis according to claim 4, characterized in that, a height of the distal segment of the femoral stem is 14-22 mm, and a diameter of a maximum cross section of the distal segment of the femoral stem is 7-13 mm.

8. The artificial alpha femoral stem prosthesis according to claim 5, characterized in that, a cross section of the femoral neck is oval.

9. The artificial alpha femoral stem prosthesis according to claim 6, characterized in that, the cross section of the proximal segment of the femoral stem and the middle segment of the femoral stem is wedge-shaped.

10. The artificial alpha femoral stem prosthesis according to claim 7, characterized in that, a outer surface of the proximal segment of the femoral stem is provided with a microgroove having a width of 1.0-1.1 mm, and a depth of 0.4-0.5 mm.

Description

DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a first schematic diagram of the structure of an artificial alpha femoral stem prosthesis according to the disclosure;

[0022] FIG. 2 is a second schematic diagram of the structure of the artificial alpha femoral stem prosthesis according to the disclosure;

[0023] FIG. 3 is a diagram of a deflection angle of the artificial alpha femoral stem prosthesis according to the disclosure.

DESCRIPTION OF MAIN COMPONENT SIGN

[0024] 1femoral stem cone;

[0025] 2femoral neck;

[0026] 3stem body;

[0027] 4proximal segment of the femoral stem;

[0028] 5middle segment of the femoral stem;

[0029] 6distal segment of the femoral stem;

[0030] 7tool operating hole;

[0031] 8microgroove.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0032] In order to make the technical problems to be solved, technical solutions and advantages more clearly, the following drawings and specific examples will be described in detail.

[0033] The preferred embodiment of the disclosure is shown in FIGS. 1 to 3.

[0034] An artificial alpha femoral prosthesis includes a femoral stem cone 1, a femoral neck 2 and a stem body 3 connected integratedly. The upper end of the femoral neck 2 is provided with a tool operating hole 7 into which a tool can insert to conduct an processing under an implantion operation. The stem body 3 comprises a proximal segment 4 of the femoral stem, a middle segment 5 of the femoral stem and a distal segment 6 of the femoral stem, and there is a deflection angle between the femoral neck 2 and the stem body 3, which is 035 or 145180.

[0035] Specifically, the deflection angle between the femoral neck and the stem body is an anteversion angle, which is 0, 15 or 35, with a direction towards left or towards right, and a total number of five angles. The design of the five angles is to solve the problems of metal corrosion of the modular femoral stem. The angle between the central line of the stem body 3 and the central line of the femoral neck 2 is 120140, with an optimal value of 130. The design of such angle is more in line with the structure of human physiological anatomy. The cross section of the femoral neck 2 is oval, which increases the range of activities of the prosthesis, reduces the abrasion between the femoral neck 2 and total acetabular liner. The cross section of the proximal segment 4 of the femoral stem and the cross section of the middle segment 5 of the femoral stem is wedge-shaped, such that the stem body 3 has a strong ability of anti-rotation, and also the blood circulation of the marrow cavity can be protected, and will not affect the blood supply of the marrow cavity.

[0036] In this embodiment, the distal segment of the femoral stem 6 has a structure of a highly polished bullet, avoiding collision with the cortex, reducing the thigh pain and the cortical abrasion as much as possible. In addition, the height of the distal segment 6 of the femoral stem is 14-22 mm, and the maximum cross-sectional diameter of the distal segment 6 of the femoral stem is 7-13 mm. The maximum cross-sectional diameter of the distal segment 6 of the femoral stem increases with an increment of 1 mm, and the height of the distal segment of the femoral stem increases accordingly. Taking the maximum cross-sectional diameter of the distal segment of the femoral stem having seven gradients as an example, corresponding deflection angles between the femoral neck and the stem body are 0,15 and 35 with the latter two towards left or right, and a total number of 35 products with different specifications can be generated for selection. Doctors can choose the product with an appropriate specification according to the needs of different patients.

[0037] Furthermore, the outer surface of the proximal segment 4 of the femoral stem is provided with a microgroove 8, wherein the bone graft can be automatically implanted during the prosthesis implantation, which ensures the stability of the prosthesis after it is implanted. The microgroove 8 has a width of 1.0-1.1 mm, and a depth of 0.4-0.5 mm. The outer surface of the proximal segment 4 of the femoral stem and the middle segment 5 of the femoral stem are coated with microporous titanium coating, making the surface of the prosthesis become rough, which is more favorable for bone ingrowth, and enhancing the initial stability and the anti-rotation performance of the prosthesis. The thickness of the microporous titanium coating is 100-200 m. and the porosity factor is 10-80%. The bonding strength of the microporous titanium coating is greater than or equal to 45 MPa, and the roughness of the microporous titanium coating is greater than or equal to 100 m.

[0038] The femoral neck 2 in the disclosure has large range of activity, and the prosthesis implantation is stable and effective antirotation, creating favorable conditions for ingrowth and proliferation of bone cells and soft tissue, improving the fixation effect of prosthesis in the human body, prolonging the service life of the prosthesis, improving the success rate of operation, reducing the postoperative pain of patients.

[0039] The integrated prosthesis is adopted in the disclosure, without any need to assemble components, eliminating problems such as abrasion between components and osteolysis, reducing inventory, having a low cost, suitable for all kinds of large-scale or small-scale factory; the design of the femoral stem according to the disclosure conforms to the femoral stem for geometric shape of femoral medullary cavity of more than 90% patients; the anteversion angle in the disclosure is 0, 15 or 35, and patients can choose prosthesis of appropriate specifications during surgery according to their own anteversion angle, which may effectively shorten the operation time, reduce the pain of patients, and improve the success rate of the operation. The outer surface of the prosthesis in the present disclosure is sprayed with microporous titanium coating, which enhances biological compatibility of the prosthesis, and the strength and ductility and toughness match with human bone, thereby creating favorable conditions for ingrowth and proliferation of bone cells and soft tissue, so as to achieve a perfect match between the prosthesis and the patient's femora, especially suitable for developmental dysplasia of the hip (DDH) patients with congenital dislocation of the hip (CDH).

[0040] The above is the preferred embodiment of the disclosure, it should be pointed out that for those of ordinary skill in the art, some improvement and polishing can be made without departing from the principle of the disclosure, and these improvements should also be regarded as the scope of protection of the disclosure.