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Dynamic locking screw

A technology of locking screws and fixing screws, which is applied in the field of medical devices, can solve problems such as asymmetric callus, achieve fast postoperative recovery, avoid asymmetric callus, and stabilize the healing process

Inactive Publication Date: 2012-10-03
ZHEJIANG CANWELL MEDICAL DEVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that traditional fixation screws are easy to form asymmetric callus, and provide patients with a dynamic locking screw that makes the healing process faster, more stable, and low rigidity

Method used

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Embodiment Construction

[0015] Next, the dynamic locking screw of the present invention will be further described by implementing it with reference to the accompanying drawings.

[0016] Such as figure 1 As shown, a dynamic locking screw, including a set screw 1, is characterized in that: the set screw 1 has a threaded sleeve 2, the shaft end of the set screw 1 is provided with a polished rod with an external thread structure, and the inner surface of the threaded sleeve 2 adopts a hollow belt. In the threaded structure, the fixing screw 1 and the threaded sleeve 2 are fixed together through internal and external threads, forming a dynamic elastic micro-motion structure in which the threaded sleeve 2 can move axially along the axial end of the fixing screw 1 .

[0017] Such as figure 2 As shown, the head of the fixing screw 1 of the present invention is provided with a tapered thread 3, and the end surface is provided with a quincunx-shaped hole, so as to facilitate better torque transmission.

[...

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Abstract

The invention belongs to a medical instrument, in particular to a dynamic locking screw which comprises a fixation screw. The dynamic locking screw is characterized in that a thread casing is arranged outside the fixation screw, and a shaft end of the fixation screw is provided with a structure of a polish rod with an outer thread; a hollow structure with an inner thread is adopted on the inner surface of the thread casing; and the fixation screw and the thread casing are fixed together in a manner that the inner thread is connected with the outer thread to form a dynamic elastic micro motion structure in which the thread casing can move axially along the fixation screw. The invention provides motions nearly parallel to a fracture part for a patient through the dynamic structure in which the thread casing can move axially along the fixation screw, so that the dynamic locking screw has greater potentials to form an annular callus with higher mechanical strength, thereby a quicker and more stable healing process is provided and the formation of asymmetrical poroma is avoided. The dynamic locking screw has the advantages of small wound, simple operation, quick postoperative recovery and the like.

Description

technical field [0001] The invention belongs to the class of medical instruments, in particular to a dynamic locking screw. Background technique [0002] The main biomechanical difference between the locking plate and the traditional plate is that the latter relies on the friction force at the bone-plate interface to complete the compression of the plate on the bone. As the axial dynamic load cycle increases, the screw begins to loosen and leads to a decrease in friction. Eventually the steel plate becomes loose as a result. If the plate loosens before the fracture heals, the fracture will become unstable and eventually the plate will break. Where it is more difficult to obtain and maintain firm screw fixation (such as the metaphysis and osteoporotic extremities), it is more difficult to maintain fracture stability. The biomechanics of traditional steel plates have the following biological defects: compressing the periosteum and affecting the blood supply to the fracture e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/86
Inventor 朱伟强严丽华
Owner ZHEJIANG CANWELL MEDICAL DEVICES CO LTD
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