Medical self locking screw and use method thereof
A self-locking screw, medical technology, applied in medical science, internal bone synthesis, fastening devices, etc., can solve problems such as insufficient tightness, backlash, and easy loosening
Pending Publication Date: 2018-10-16
上海博玛医疗科技有限公司
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0002] In the existing joint replacement surgery, self-tapping screws are mostly used, and their triangular thread structure has a certain self-locking ability, but the existing self-locking screws with a triangular thread structure have poor self-locking ability. After a long period of service, the body is prone to loosening
The surrounding bone may not be compact enough after implantation, resulting in a sharp decline in its self-locking ability, and there may be a risk of regression, causing certain damage to the human body
Method used
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[0025] In order to make the technical means, creative features, objectives and effects of the invention easy to understand, the present invention will be further elaborated below in conjunction with specific illustrations.
[0026] A preferred embodiment of the present invention is to provide a medical self-locking screw, the purpose is to fix the inner screw inside the outer screw, expand the outer screw head through the thimble on the inner screw, and pass through the outer cone on the inner screw. Expand the matching body, compress the surrounding bone, and achieve a double locking effect through the self-locking between the inner and outer screws; when the anti-retraction ring retreats, it can hook the surrounding fixed parts to achieve the anti-retreat effect; effectively prevent implants After the prosthesis has been in service for a long time, there are adverse reactions such as loosening and fretting.
[0027] Such as figure 1 As shown, a medical self-locking screw, w...
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The invention discloses a medical self locking screw, wherein the medical self locking screw is formed by combining an outer screw and an inner screw; the outer screw comprises a matching body and anouter screw front part in fixed connection; the outer screw front part comprises an outer screw rod body and an outer screw head in fixed connection; fixing outer screw threads are arranged on the outer periphery of the outer screw rod body; a stopping ring is arranged on the outer periphery of the matching body; the inner screw consists of an outer cone body, an inner screw rod body, a cone bodypin and an ejection pin; the bottom end of the cone body pin is connected with the ejection pin; the outer screw threads are arranged on the outer periphery of the inner screw rod body; the bottom endof the inner screw rod body is connected with the cone body pin; the top end of the inner screw rod body is connected with the outer cone body; a spanner hole is formed in the top of the outer cone body; a cavity matched with the inner screw is arranged on the outer screw; the cavity is arranged inside the outer screw rod body and penetrates through the matching body; the cavity comprises a cylindrical cavity and a conical cavity which are fixedly connected from top to bottom; inner screw threads are arranged on the inner wall, near the cylindrical cavity, of the outer screw rod body; and theinner screw threads are matched with the outer screw threads.
Description
technical field [0001] The invention relates to the field of joint replacement medical devices, in particular to a medical self-locking screw and a method for using the same. Background technique [0002] In the existing joint replacement surgery, self-tapping screws are mostly used, and their triangular thread structure has a certain self-locking ability, but the existing self-locking screws with a triangular thread structure have poor self-locking ability. After a long period of service, the body is prone to loosening. The surrounding bone may not be compact enough after implantation, resulting in a sharp decline in its self-locking ability, and there may be a risk of regression, causing certain damage to the human body. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a medical self-locking screw, which can fix the inner screw inside the outer screw, respectively expand the outer screw head through the thi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): A61B17/68A61B17/86
CPCA61B17/683A61B17/8625A61B17/8685A61B2017/564A61B2017/681
Inventor 唐飞尚亚光杨长桂
Owner 上海博玛医疗科技有限公司