Elastic barb medical bone screw

Abstract

The invention discloses an elastic barb medical bone screw which comprises an outer nail and elastic barb components and is characterized by also comprising elastic reset components and an inner nail;the outer nail is provided with an inner cavity; the elastic reset components are arranged at the bottom of the inner cavity of the outer nail; each elastic barb component comprises a mounting columnand an elastic piece and is arranged in the inner cavity of the outer nail; the upper end of each elastic reset component is in contact to the lower end of the corresponding mounting column; the lower end of the inner nail is in contact to the upper ends of the mounting columns; each mounting column is provided with an elastic piece receiving groove; one end of each elastic piece is connected with the corresponding elastic piece receiving groove; the other end of each elastic piece is popped up relative to the corresponding mounting column; elastic piece popup openings face the inner nail; the side wall of the inner cavity is provided with popup holes through which the corresponding elastic pieces are propped up, and the positions and amounts of the popup holes correspond to the positionsand amounts of the elastic pieces. The bone screw provided by the invention is firm to mount and convenient to disassemble and take out.

Description

technical field [0001] The invention relates to a bone screw, in particular to an elastic barb medical bone screw. Background technique [0002] Fracture is a kind of acute clinical problem that traumatologists face daily. Single or reciprocating overload is the main cause of fracture, causing predictable soft tissue damage. The fracture surface is broken and separated rapidly, forming a gap (space) Acupuncture phenomenon), causing different degrees of damage to soft tissue, once a fracture occurs, timely and effective fixation treatment must be carried out to prevent secondary damage. [0003] Bone screws are implants that are in direct contact with bone, and the stability of their combination with bone material is the most critical factor for the success of the entire fracture treatment operation. The root cause of the loosening and pulling out of the external nail is the failure of the internal and external threaded connection between the external nail and the bone. The ...

AI Technical Summary

Problems solved by technology

From the perspective of biomechanics and engineering, the stability of the external nail is the contact problem of the bone-external nail interface. In the traditional mechanical field, the failure and loosening of the external nail is the moment provided by the friction between the external nail and the implant. The torque smaller than the instantaneous vibration will cause the outer nail to slide, and the complex load of the reciprocating vibration machine will eventually lead to failure.

Another type of failure is related to the stiffness of the outer nail. The axial load (pullout force) is loaded along the axis of the outer nail. The screw tooth deforms and fails due to insufficient stiffness, or the internal thread of the implanted material is damaged.

[0004] In order to solve the problem that the outer nail is easy to loosen, the Chinese invention patent application number 201210345780.4 discloses an outer nail with V-shaped elastic barbs, thereby enhancing the pull-out resistance and radial stability of the outer nail. It is difficult to remove after the nail is fixed, and it is harmful to the human body if it exists in the body for a long time

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