Semi-pelvic prosthesis

Abstract

The invention belongs to the technical field of designing and manufacturing of prosthesis and relates to semi-pelvic prosthesis. The semi-pelvic prosthesis is characterized by being formed by connecting an ilium fixing part, acetabulum prosthesis, and a pubis connection part, wherein the ilium fixing part is used for being connected and fixed with a residual iliac wing and sacrum; the pubis connection part is used for being connected and fixed with the residual pubis on the same side or pubis on an opposite side; the ilium fixing part and the acetabulum prosthesis are connected by a tapered rotation prevention clamp port; and the acetabulum prosthesis and the pubis connection part are fixed and connected by a bolt. The semi-pelvic prosthesis has the advantages that (1) compared with assembled prosthesis, hot bending forming integrated prosthesis is disperse in stress; (2) the semi-pelvic prosthesis and the residual iliac wing are fixed by a self-locking nail, and the sacrum and the residual pubis are fixed by a self-locking nail, so that loosening of the bolt can be effectively prevented; and (3) the semi-pelvic prosthesis is provided with a flat supporting structure, so that the interfacial stress between the prosthesis and the sacrum, and between the prosthesis and the pubis can be converted from shear force or tensile stress into pressure stress, the loosening or displacement of the prosthesis is prevented, the long-term stability of the prosthesis is facilitated, and the prosthesis cannot be broken easily when complex force is applied to a human body for a long time.

Description

technical field [0001] The invention belongs to the technical field of prosthesis design and manufacture, and in particular relates to a human half pelvis prosthesis. Background technique [0002] Pelvic tumors are relatively common, accounting for about 3%-4% of primary bone tumors. Because pelvic tumors often involve the acetabulum and are extensive, surgery often requires hemipelvic amputation. Hemipelvetomy refers to the amputation of half of the pelvis and the lower limbs on the same side, also known as hindquarter-amputation, which will cause the patient to lose the function of the lower limbs and cause serious mental illness. hit. The concept of limb salvage combined with bone tumor treatment has been widely accepted. After resection of the tumor-bearing hemipelvis and internal hemipelvetomy, the reconstruction of the pelvic ring becomes the key to restoring the function of the patient's lower limbs. Especially after amputation of the acetabulum and most or all of ...

AI Technical Summary

Problems solved by technology

Moreover, the adjustment of the position of the prosthesis during the operation must be three-dimensional, which significantly complicates the structure of the prosthesis. Not only is the operation difficult, the number of spare parts is large, and the price increases significantly, but the prosthesis is loosened, broken, The chance of dislocation is also significantly increased

[0005] (2) Restricted hip joint tumor prosthesis + autogenous fibular bone graft + limb shortening surgery to reconstruct the patient's gravity line and joint function. A restrictive hip joint prosthesis was placed in the position, the bilateral hip joints were not at the same level, and the limbs on the affected side were significantly shortened, resulting in a greater degree of disability and difficulty in walking for the patient after surgery

[0006] (3) Saddle-type prosthesis, in the case of retaining part of the iliac wing, is used to reconstruct the load-bearing line and joint function. It is required to retain enough ilium to obtain mechanical support for the saddle rest, and cannot be used for subtotal or total iliac prosthesis. Patients with bone resection

Moreover, the postoperative hip flexion range is generally less than 50°, and patients can only half sit, let alone squat.

[0007] (4) For the split-assembled artificial hemi-pelvic prosthesis, during pelvic acetabular reconstruction, the angle between the ilium part and the acetabular part of the prosthesis and the installation of the connecting body should be adjusted according to the range of acetabular resection; It is difficult to correctly adjust the three-dimensional position of each assembly during the operation and to be symmetrical with the opposite side, and it is difficult to maintain the joint force and stability between each assembly and between bones for a long time

There are femoral blood vessels and nerves on the surface of the horizontal branch of the pubic bone, while there is an obturator nerve (the midline superior to the urethra) on the deep surface, which will significantly affect the surgical exposure of the horizontal branch and the placement and fixation of the prosthesis, making the operation more difficult

At present, the general hemipelvic prosthesis is only fixed with bolts or screws, which is difficult to bear the reciprocating shear load

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