Interface screw

Abstract

The invention provides an interface screw which improves the structure of an existing interface screw and is additionally provided with a porous sheathing canal so as to prevent ligament cutting forcewhen the screw is implanted. The interface screw is characterized in that the interface screw penetrates through the sheathing canal. The sheathing canal comprises: a sheathing bottom which is located at the bottom of the sheathing canal, wherein a through hole allowing the interface screw to penetrate through is formed in the sheathing bottom; and blades which are connected to the sheath bottom.Each blade is provided with a sheath hole and anti-skid lines, the sheath hole is located in the upper end, away from the sheath bottom, of each blade, the anti-skid lines are distributed on each blade in a sawtooth shape, and the anti-skid lines incline in the direction away from the sheath bottom.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to an interface screw. Background technique [0002] The interface screw is used for ACL (knee cruciate ligament) reconstruction, and plays the role of fixing the ligament during the operation. The reciprocating motion of the knee joint will make the interface screw have a continuous outward creeping tendency, so the fixation strength and creep resistance of the interface screw Particularly important. However, the fixing strength and creep resistance of the currently available interface screws are still insufficient. [0003] The interface screw has the following problems: the interface screw is a hollow conical screw, and its nail head is thin, and it is easy to deform or break under the action of torsion during the screw-in process; when the interface screw is screwed in again and the knee joint reciprocates, it will cause damage to the ligament. The shear force makes the ligament...

AI Technical Summary

Problems solved by technology

However, the fixing strength and creep resistance of the current commercially available interface screws are still insufficient.

[0003] The interface screw has the following problems: the interface screw is a hollow conical screw, and its nail head is thin, and it is easy to deform or break under the action of torsion during the screw-in process; when the interface screw is screwed in again and the knee joint reciprocates, it will cause damage to the ligament. Shearing force makes the ligament prone to fatigue failure; the degradation time of the absorbable interface screw does not coincide with the bone ingrowth time, resulting in insufficient bone density and complications after surgical rehabilitation

Images