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Ligament fastening screw

A technology for fixing screws and ligaments, which is applied in the field of medical devices, can solve problems such as weak pull-out resistance, unbalanced force, and loosening of cable pulls, and achieve good bone ingrowth opportunities, good blood circulation, and improved pull-out resistance force effect

Inactive Publication Date: 2013-09-04
武汉爱思唯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing anchors have the following problems: 1. Weak pull-out resistance: The anchors currently used in the market are either designed with deep and wide threads or with shallow and dense threads, which cannot achieve good pull-out resistance.
2. It is easy to be loosened by cable pull: 70% of the wire-nail joint points of the existing anchor are located at the tail of the anchor, and 30% are located in the middle of the anchor.
The force is unbalanced, and it is easy to loosen the cable pull
[0005] 3. Poor bone ingrowth: the existing anchors only have holes in the nail tail, so it is difficult for blood to enter the anchor, and it is difficult for bone to grow into the anchor

Method used

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Embodiment Construction

[0019] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and are only examples. At the same time, the advantages of the present invention will become clearer and easier to understand.

[0020] Referring to the accompanying drawings, it can be seen that the ligament fixation screw of the present invention comprises three parts: a screw head 1, a screw body 2 and a screw tail 3. The screw head 1 includes two symmetrically arranged baffle plates 11 and two baffle plates 11 between the horizontal plate 12, the screw body 2 is arranged with deep and wide threads 21 and openings 22, the nail tail 3 is arranged with shallow dense threads 31, there is a hollow cavity 4 through the screw head 1, The screw body 2 and the screw tail 3 form a channel. There are two rows of openings 22 , the upper row and the lower row are each evenly arranged with t...

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Abstract

A ligament fastening screw comprises a screw head (1), a screw body (2) and a screw tail (3), wherein the screw head (1) comprises two baffles (11) which are symmetrically arranged and a transverse plate (12) located between the two baffles, the screw body (2) is provided with deep widening threads (21) and an open pore (22), the screw tail (3) is provided with shallow dense threads (31), and a hollow cavity (4) penetrates through the screw head (1), the screw body (2) and the screw tail (3) to form a channel. The ligament fastening screw overcomes the defects that an existing ligament fastening screw is weak in pullout force, prone to loosening due to inclined pulling and not good in bone bone ingrowth, and has the advantages of being strong in pullout force, not prone to loosening, and good in bone ingrowth state.

Description

technical field [0001] The invention relates to a medical device, more specifically it is a ligament fixation screw. Background technique [0002] After retrieval, the application publication number is CN102525583A, and the title of the invention is: adjustable anchor system and method, which discloses a ligament fixation screw (or anchor), but this screw has only a single thread, because the human bone is divided into cortical layers and the cancellous layer of bone, there are problems with the firmness of the single screw fixation; in addition, there is no hole in the nail body of this adjustable anchor, if there is no hole in the early growth process, blood supply will occur If it is unreasonable, it is difficult for bone to grow in, which is not good for ligament fixation. [0003] Evaluation criteria for the quality of anchors: 1. Pull-out resistance: The evaluation of the pull-out resistance of an anchor depends mainly on the design of the thread. The thread in the c...

Claims

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Application Information

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IPC IPC(8): A61B17/86
Inventor 黎建波黄艳
Owner 武汉爱思唯科技有限公司
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