Anti-falling bone screw

Abstract

The invention relates to an anti-falling bone screw. The bone screw comprises a screw head and a screw rod at the bottom of the screw head, wherein a device inner cavity and a telescopic tooth piece device installed in the device inner cavity are arranged in the screw head; the telescopic tooth piece device comprises a telescopic tooth piece and a gear for driving the telescopic tooth piece; the gear and the screw rod are coaxially arranged; the telescopic tooth piece is provided with a tooth structure meshed with the gear; the rotation action of the gear drives the telescopic tooth piece to stretch out or retract from the side face of the screw head; a guide structure is arranged in an inner cavity of the screw head and guides stretching and retracting of the telescopic tooth piece; and a gear through hole communicating with the device inner cavity is formed in the front face of the screw head and used for rotating the gear. The bone screw has the beneficial effects that when the bone screw is used for old people, osteoporosis patients and the like, the bone screw can be tightly clamped with the bone by stretching out the telescopic tooth piece, so that the bone screw cannot fall off; the bone screw can be normally taken out of the bone by retracting the telescopic tooth piece; and the use is convenient, and the anti-falling effect is remarkable.

Description

technical field [0001] The invention relates to an anti-bone screw. Background technique [0002] Lag screw is a kind of bone screw, which is directly used on human bones, and there are some problems, such as the problem of screw falling off in patients such as the elderly and osteoporosis. [0003] The greater trochanter of the femur is the square bulge on the outer side of the joint between the femoral neck and the body. It supports people to stand up. The force on the greater trochanter of the femur is large. If the lag screw slips or falls off, it will cause secondary damage. It is very likely to cause some irreversible damage. [0004] Aiming at the problem that bone screws are easy to fall off when used in patients with osteoporosis, the usual prior art is to set bone cement holes on the shanks of bone screws, and inject bone cement after screwing in the bone screws to prevent the bone screws from falling off. The problem is that it is difficult to remove, and it wil...

AI Technical Summary

Problems solved by technology

[0003] The greater trochanter of the femur is the square bulge on the outer side of the joint between the femoral neck and the body. It supports people to stand up. The force on the greater trochanter of the femur is large. If the lag screw slips or falls off, it will cause secondary damage. likely to cause some irreversible damage

[0004] Aiming at the problem that bone screws are easy to fall off when used in patients with osteoporosis, the usual prior art is to set bone cement holes on the shanks of bone screws, and inject bone cement after screwing in the bone screws to prevent the bone screws from falling off. The problem is: it is difficult to remove, it will cause secondary damage to the wound, what is more, it cannot be removed after the bone cement is injected, and it will remain in the bone, which will damage the internal structure of the bone marrow, etc.

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