Umbrella-shaped bone-setting bolt convenient to disassemble

Abstract

An umbrella-shaped bone-setting blot comprises a bolt body, the bolt body comprises a screw head and a hollow screw body, the hollow screw body comprises a smooth rod part, at least two thread umbrella pieces and soft connecting pieces with a number matching the thread umbrella pieces, each thread umbrella piece is arranged uniformly along the circle of the smooth rod part, and each thread piece is connected with the end of the smooth rod part through the soft connecting piece, and the soft connecting pieces are surrounded by a ring groove. The middle cavity of the hollow screw body is inserted with a core shaft which is used to drive the inner wall of the thread umbrella piece to keep straight after the force is applied, and a pre-contraction part is arranged in the ring groove to drive the end wall of the thread umbrella piece to keep straight after the force is applied, and the end part of the screw head is provided with a screw-in operation cavity which is communicated with the hollow screw body, and a pull-out step used for screwing out for the bolt body is arranged at one end of the screw head, close to the hollow screw body. The bone-setting bolt has the advantages of simpleand reliable structure, convenient operation, avoiding operation damage and improving healing progress.

Description

technical field [0001] The invention mainly relates to a medical auxiliary device, in particular to a detachable umbrella-shaped bone bolt. Background technique [0002] Femoral neck fractures are often fixed with three sharp hexagonal hollow screws, often made of titanium alloy. Since the front part of the screw is a cancellous bone thread, the thread is thicker and the holding force is greater. In addition, there is generally no tapping when the screw is screwed in during the operation, so the sharp hexagonal slippery wire often appears. If the hollow screw needs to be removed after the operation (for example, femoral head necrosis after femoral neck fracture, new hip replacement or head-preserving treatment of the femoral head is required), it is necessary to use a sharp hex screwdriver to unscrew the hollow screw. The thread at the front of the screw is thicker, and it has a greater holding force in the femoral head. If the sharp hexagonal hole has slipped in the early ...

AI Technical Summary

Problems solved by technology

And when the screw is screwed in during the operation, there is generally no tapping, so the sharp hexagonal slippery wire often appears

If the hollow screw needs to be removed after the operation (for example, femoral head necrosis after femoral neck fracture, new hip replacement or head-preserving treatment of the femoral head is required), it is necessary to use a sharp hex screwdriver to unscrew the hollow screw. The thread at the front part of the screw is thicker, and the holding force in the femoral head is greater. The sharp hexagonal hole is more likely to have a sharp hexagonal slippage if the thread has been slipped in the early stage.

Once the thread slips, due to the lack of an effective hollow screw extractor, it is necessary to use a vise or an electric drill to drill a hole to hope to remove the screw. The operation is time-consuming and causes great damage to the femoral neck and femur, which seriously affects the progress of the operation and the prognosis of the operation.

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