Thighbone far-end prosthesis capable of preserving epiphysis

Abstract

The invention relates to the technical field of medical apparatus and instruments, and provides a thighbone far-end prosthesis capable of preserving epiphysis. The thighbone far-end prosthesis comprises a thighbone far-end prosthesis body and a myeloid needle sleeve, wherein the thighbone far-end prosthesis body and the myeloid needle sleeve are in taper fit. The thighbone far-end prosthesis bodyis provided with a lower end face; a lower end protrusion is arranged on the lower end face, and a third bone trabecula structure is arranged on the surface of the lower end protrusion; and the myeloid needle sleeve is provided with a solid inner wall, and a second bone trabecula structure is arranged on the surface of the solid inner wall. The beneficial effects lie in that the lower end protrusion is customized in size according to the medullary cavity of a patient and matched with the medullary cavity of the patient, rapid intraoperative positioning can be achieved, the postoperative prosthesis is prevented from deviating front and back, and the prosthesis is prevented from damaging the bone of the patient. The third bone trabecula structure is arranged on the surface of the lower end protrusion, so that the contact area between the prosthesis body and human bones is increased, the bone ingrowth places can be increased, and the prosthesis body is more stable and firmer and is not easy to dislocate.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a femur distal end prosthesis with epiphysis preserved. Background technique [0002] In the prior art, Chinese patent CN2016167123U discloses an articular surface-preserving modular femoral tumor knee prosthesis, including a distal femoral prosthesis, a movable locking plate, a femoral canal extension handle, a femoral shaft extension and locking nails Bone screw, femoral medullary canal extension stem is fixed on the extension section of the backbone, the distal femoral prosthesis is set at the lower part of the extension section of the backbone, the movable locking plate is set on the distal femoral prosthesis, and the movable locking plate and the distal femoral prosthesis pass through the lock Fixation with bone screws. The lower part of the distal femoral prosthesis is connected to the epiphysis with a layer of trabecular porous structure with a thickness of 1-5mm....

AI Technical Summary

Problems solved by technology

[0003] (1) The long-term biological fixation of the distal femoral prosthesis only relies on a layer of porous bone trabecular structure between the prosthesis and the osteotomy surface, the contact area is small, and it takes longer to achieve stable biological fixation; (2) The porous structure of trabecular bone in the body is a single structure, but the bone quality of the human body is relatively complex. There is no proprietary porous structure of trabecular bone designed according to different bone ingrowth requirements. The bone ingrowth time is slow, and the time to achieve long-term biological fixation is relatively short. long; (3) the prosthesis is only fixed by the two side wings and nails, the prosthesis is not well positioned during the installation, and the prosthesis is prone to deviation after the operation; (4) the medullary needle segment of the prosthesis is fixed with bone cement or biological Fixation is not conducive to long-term stability, bone cement is harmful to the health of patients, and the long-term stability of biological fixation is not firm; (5) The direction of nail driving in the prosthesis is horizontal, and due to the influence of gravity, it bears a large shear force and is easy to break; ( 6) The femoral prosthesis is equipped with a movable locking nail plate, which increases the operation steps, and the two-piece structure is only fixed by screws, which has a long-term risk of falling off and insufficient long-term stability

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