Anti-rotation and anti-retreating double-thread hollow screw

A double-threaded, hollow screw technology, used in internal fixators, internal bone synthesis, fixators, etc., can solve problems such as fixation failure, reduce the possibility of bending or fracture, improve pullout resistance, and increase the contact area. Effect
CN112716585AActive Publication Date: 2021-04-30北京中安泰华科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
北京中安泰华科技有限公司
Publication Date
2021-04-30

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Abstract

The invention relates to the field of medical screws, and in particular, relates to an anti-rotation and anti-retreating double-thread hollow screw which comprises a screw main body, and the interior of the screw main body is hollow and the two ends of the screw main body are provided with openings; the screw main body comprises a columnar rod body and a screw tail integrally formed at one end of the columnar rod body, and a tail external thread is processed on the outer wall of the end, close to the screw tail, of the columnar rod body; and a head multi-thread is processed on the outer wall of the end, away from the screw tail, of the columnar rod body, and the lead of the tail outer thread is larger than or smaller than that of the head multi-thread. According to the anti-rotation and anti-retreating double-thread hollow screw, due to the arrangement of the tail external thread and the head multi-thread, when the double-thread hollow nail is screwed into a bone, a displacement difference is formed, so that the pressurizing and anti-pulling effects are achieved, and the possibility that the double-thread hollow nail retreats and rotates after being implanted is reduced; and meanwhile, a solid rod inner core is arranged in the screw main body, so that the strength of the hollow screw is greatly improved.
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Description

technical field

[0001] The present application relates to the field of medical screws, in particular to an anti-rotation and anti-retreat double-threaded hollow screw. Background technique

[0002] Cannulated screws are mainly used in the surgery of limb fractures and fixation of fracture fragments. Hollow screws are usually made of stainless steel or titanium, and have a hollow structure inside, through which Kirschner wires can pass to facilitate the implantation of the hollow screw.

[0003] Hollow screw implantation is generally divided into three steps: the first step is to drive the Kirschner wire into the nail at the fracture site; the second step is to put the hollow screw on the Kirschner wire and twist it into the bone along the Kirschner wire until it is fixed. position; the third step, take out the Kirschner wire.

[0004] However, according to years of clinical experience, the inventors found that the hollow screw may be withdrawn and rotated due to improper m...

Claims

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