Novel supporting and pressurizing screw for femoral neck fracture

Abstract

The invention provides a novel supporting and pressurizing screw for femoral neck fracture. The novel supporting and pressurizing screw comprises a screw body; the screw body is of a hollow structure;an outer surface of the head end of the screw body is provided with a first thread; an outer surface of the tail end of the screw body is provided with a second thread; the direction of the first thread is opposite to the direction of the second thread; and the tail end of the screw body is provided with a cutting surface which is used for adhering a diaphysis. According to the invention, the screw threads with opposite directions are respectively arranged at the head end and the tail end of the screw body, so that the holding force is increased; after the tail end of the screw is cut, when the screw body is screwed into the femoral neck, the tail end of the screw is still provided with one screw thread to be in riveting with a cortex, so that holding force is enhanced; and meanwhile, thecutting surface is also clung to a bone surface, so that discomfort caused by protrusion of an internal fixture is reduced. The novel supporting and pressurizing screw is in close contact with the cortex of the diaphysis, and irritation is reduced.

Description

technical field [0001] The invention belongs to the technical field of medical instruments, and in particular relates to a novel support and compression screw for femoral neck fracture. Background technique [0002] Open reduction and internal fixation is an effective way to treat femoral neck fractures. During the operation, screw fixation can be used alone or a combination of plates and screws can be used to fix the fracture. The traditional treatment method is to fix with half-threaded hollow lag screws (hereinafter referred to as screws). Three or four screws are placed into the femoral neck in the shape of a regular triangle or an inverted triangle. The length of the screws is 75mm-110mm. A certain irritation. Since the screw part of the hollow lag screw has no thread, it is easy to back off the screw during the femoral neck healing process in the later stage, resulting in a decrease in holding force. At the same time, the protrusion of the internal fixation is likely...

AI Technical Summary

Problems solved by technology

However, the middle part of the solid bolt is a weak link, which is easy to break after a certain torque is reached, and multiple verifications are needed in the later stage to see if this solution is feasible

At the same time, although the design of the screw cap has been processed with a low notch, it will still cause skin irritation for small people, or cause the need to remove the screw in the second stage

[0006] In order to avoid the irritation of the nut, the two ends of the screw can be designed as tapered threads, the smooth rod in the middle slides, and the pressure is generated by the screw pitch when screwing in. The tail end is flush with the contact point of the cortex, avoiding skin irritation, but at the same time losing support

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