Screw nail for fixing fractured cancellous bone

Abstract

The invention relates to an internal fixation device for a fractured cancellous bone. The device specifically includes two parts including a screw nail body and a nail tail structure. The nail body isof a spiral spring-like structure with a sharp front portion, and the cross section of the screw nail body is circular. The screw pitch of the screw nail body and the cross section of the snail bodycan be appropriately changed according to materials and mechanical properties; the nail tail of the screw nail body is a hollow outer hexagonal nail tail, and the screw nail body rotates naturally tobe fused with the nail tail naturally. A hollow part of the nail tail is threaded and used for mounting a hexagonal screw-in wrench matched with the hollow part. The hexagonal screw-in wrench is hollow and is internally provided with a bolt which is in threaded match with the hollow part of the nail tail, and the bolt is also hollow and used for containing a navigation Kirschner wire. The hexagonal screw-in wrench is matched with the hexagonal nail tail. If the nail tail is U-shaped, when the nail body is screwed into a spine vertebral body, a round rod matched with the nail body can be placedfor fixation of the anterior spine.

Description

Technical field [0001] The invention relates to a fracture cancellous bone fracture internal fixation device Background technique [0002] Fractures in the cancellous bone area are common fractures in orthopedics. Such as intertrochanteric fractures, femoral neck fractures, knee platform fractures, etc., are common fracture types in orthopedics. At present, fixation of secondary fractures is mainly based on cancellous bone compression screws, spiral reamers, Kirschner wires, etc. However, the main disadvantages of these fixation methods are 1. Unreliable fixation and easy slippage failure, such as Kirschner wires; 2. The internal fixation lacks elasticity and is easy to stress shielding; 3. The internal fixation is thick and the bone loss is large, which increases the risk of re-fracture. In order to solve the shortcomings of the current cancellous bone fixation device, refer to the screwing method of the wine cork corkscrew auger. The design ideas of spiral nails are introduc...

AI Technical Summary

Problems solved by technology

However, the main disadvantages of these fixation methods are: 1. Unreliable fixation, easy to slip and fail, such as Kirschner wire; 2. Lack of elasticity of internal fixation, easy to shield stress; 3. Large internal fixation, large bone loss, and increased risk of refracture

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