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Bone screw

A bone screw and thread technology, applied in the field of medical devices, can solve the problems of large thread extrusion load, high screwing torque, and low quality of screw holes, and achieve high thread quality, reduce extrusion load, and reduce the risk of infection Effect

Inactive Publication Date: 2014-05-28
SHANGHAI DETROIT PRECISION FASTENER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ordinary self-drilling and self-tapping screws require high thread surface hardness, high thread extrusion load, high screwing torque, and low quality of tapped holes

Method used

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Embodiment Construction

[0031] The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

[0032] Such as figure 1 As shown, the bone screw of the present invention consists of three parts: a head 1 , a stem 2 and an end 3 . The end mainly has a pointed end and a flat end. However, according to the function of use, grooves, grooves, incisions or drill-like parts with cutting functions can be processed.

[0033] In the first preferred embodiment of the present invention, as figure 2 As shown, the end of the rod is a flat end, and the thread at the end of the bone screw has a cutting cone. The parameters of the cutting cone (groove shape, rake angle, and back angle) can refer to the tap, which is equivalent to the first few teeth of the bone screw in the inner hole. Tapping the thread reduces the extrusion load of the...

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PUM

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Abstract

The invention discloses a bone screw which comprises a head, a rod, a rod tail end and a cutting portion. The rod is provided with a threaded outer peripheral surface and comprises a calibration portion, and the cutting portion is provided with a front angle and a rear angle. The rod tail end mainly comprises a saw end and a flat end, but grooves, slots, notches or similarly drill-bit-shaped portions or the like with cutting functions can be machined at the rod tail end according to service functions. The bone screw has the advantages that working hours can be reduced, the operation efficiency can be improved, accordingly, suffering of patients can be relieved, and open surgical infection risks of patients can be reduced; squeezing load on threads at the rear of the bone screw can be reduced, the threads tapped by the self-tapping bone screw are high in quality, and the external threads and the internal threads of the bone screw can be reliably connected with one another.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a medical bone screw. Background technique [0002] The bone screw is an internal fixation device for treating fractures. The bone screw is made of metal materials, mainly pure titanium, titanium alloy, cobalt-based alloy and stainless steel. Metal and alloy materials have sufficient strength and toughness, strong resistance to bending and torsion, are biologically inert materials, and the combination with bone is a mechanical lock. [0003] In order to reduce the operation time and reduce the use of instruments in the operation, a self-drilling self-tapping bone nail is also clinically applied, such as the US patent, patent number: 5797014. The difference between this self-drilling self-tapping screw and ordinary self-tapping screws is that ordinary self-tapping screws must go through two processes of drilling (drilling the bottom hole) and tapping (including fasten...

Claims

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Application Information

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IPC IPC(8): A61B17/86A61B17/88
CPCA61B17/86
Inventor 顾茂众彭树庆
Owner SHANGHAI DETROIT PRECISION FASTENER
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