Biological hollow cancellous bone screw

Abstract

The invention relates to a biological hollow cancellous bone screw which comprises a screw head, a screw body and a screw tail, wherein the screw head, the screw body and the screw tail are sequentially connected; a cavity for storing medicaments is arranged in the screw body; the cavity penetrates through the screw body and the screw tail; screw threads are arranged on the outer surface of the screw head; side holes are also arranged on the screw body; the screw tail is provided with a bolt; and the bolt is matched with the shape of the opening of the cavity at the screw tail and plugs the opening of the cavity. The biological hollow cancellous bone screw of the invention is used as an internal fixation device for a femoral neck and the like which can be fractured easily and can not heal easily and / or parts which can cause osteonecrosis easily, and can accelerate bone repair of fracture parts and prevent aseptic necrosis and nonunion of bones by injecting substances for promoting bone repair and regeneration into the cavity.

Description

【Technical field】 [0001] The invention relates to the field of medical devices, in particular to a biological hollow cancellous bone screw used for internal fixation of fracture sites. 【Background technique】 [0002] The internal fixation treatment of femoral neck fractures has a history of nearly a hundred years. The three-edged nail in the prior art was invented by Smith-Petersen in 1929. It belongs to the single-nail system. The talar side of the femur is implanted to fix the fracture of the femoral neck and prevent rotation. [0003] Sliding compression nails, such as dynamic hip screws (DHS), Richard nails, Pugh nails, etc., generally consist of two parts: a fixed nail and a nail plate with a sleeve. After fixation, the fixation nail can slide in the sleeve. When the fracture surface is absorbed, the nail slides sideways into the sleeve and shortens to keep the fracture end in close contact. [0004] The hollow lag cancellous bone screw produced in the 1980s is a mult...

AI Technical Summary

Problems solved by technology

However, because the femoral neck fracture site is often subjected to relatively large shear stress, and the blood supply characteristics of the femoral head itself mainly depend on the lateral epiphyseal artery originating from the medial circumflex femoral artery, the blood supply of the femoral head will often be impaired after femoral neck fracture. Destruction, prone to aseptic necrosis of the femoral head and fracture nonunion

Although various internal fixation systems can mechanically fix the fracture site, they have no special effect on the biological healing of the fracture and the prevention of aseptic necrosis of the femoral head.

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