Preparation method of bone screw with double-layered structure

A double-layer structure and bone screw technology, applied in the field of medical devices, can solve the problems of affecting bone growth, stress shielding, and large elastic modulus of bone screws, etc., and achieve the effect of reducing stress shielding effect and good elastic modulus performance

Active Publication Date: 2018-05-18
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bone screws are usually inserted into the bone for fixation, but for the bone, the elastic modulus of the bone screw is too large, and the phenomenon of stress shielding will occur after implantation, which will affect the growth of the bone
Because the elastic modulus of traditional titanium alloy medical screws is quite different from that of real bones and has poor compatibility with human bone tissue, it is easy to have stress concentration after surgery, which will eventually lead to the loss of implants or secondary damage to bones, or even The screws are corroded and rusted by body fluids, and eventually have toxic and side effects on the human body

Method used

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  • Preparation method of bone screw with double-layered structure
  • Preparation method of bone screw with double-layered structure
  • Preparation method of bone screw with double-layered structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Use option one:

[0052] 1. Design and optimization of the inner prism structure of the bone screw

[0053] (1) Use CAD software to design the single prism structure of the inner layer of the bone screw. The structure is a multi-prism structure surrounded by multiple parallelograms spliced ​​with the long side as the shared side. The inner structure parameters: long side 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, the short side is 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, the long and short sides are equal, and the long and short sides have the same diameter as 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, the angle between the long and short sides is 30°, 45°, 60°, 75°, 90°, and the number of parallelograms is 3, 4, 5, 6, 7.

[0054] (2) Using ANSYS\deform, within the numerical range of the inner structure parameters given in step (1), conduct an orthogonal test on the elastic modulus of the bone screw inner single prism structure designed in step (1) According to the influence trend of each variab...

Embodiment 2

[0069] Take option two

[0070] 1. Design and optimization of the inner prism structure of the bone screw

[0071] Same as plan one.

[0072] 2. Design and optimization of bone screw outer structure

[0073] (5) Use CAD software to design the outer structure of the bone screw. The structure is a cylinder structure with an inner diameter of 4.1mm and a wall thickness of 0.6mm. There are uniform circular holes distributed on the wall of the cylinder. See Figure 4 From left to right are I, II, III.

[0074] (6) In the CAD software, the inner prism structure of the bone screw is embedded in the outer structure of the bone screw to ensure that the end points of the bottom polygon of the inner prism structure of the bone screw are evenly connected to the bottom surface of the outer structure of the bone screw through the transverse connecting column, And it is preferentially connected to the end point of the bottom surface of the outer structure of the bone screw, and the size c...

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Abstract

The invention relates to a bone screw with a double-layered structure. The bone screw with the double-layered structure is suitable for broken bone connection of osteoporosis bones, bone lesion and bone deformity correction. By three steps including design and optimization of a prism structure of the inner layer of the bone screw, design and optimization of an outer-layer structure of the bone screw and printing of a whole structure of the bone screw, the bone screw with the double-layered structure is prepared. By the bone screw, while approximate bone elasticity modulus performance is ensured, torque which is large enough is still maintained to meet application requirements. By the provided bone screw, the problem of mechanical properties of the bone screw are not matched is solved, anda stress shielding effect caused by a traditional bone screw is reduced effectively; a method for designing a porous structure of the bone screw is proposed, and a new thought is provided for searching a designing mode and a processing method for the bone screw which promotes rapid recovery of broken bones and avoids secondary injury to the bone after surgery; and the problem that by a traditionalmanufacturing mode, a complicated bone screw cannot be manufactured is solved.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a double-layer structure bone screw suitable for fracture connection of osteoporotic bone, bone lesion and correction of bone deformity. Background technique [0002] Bone screws, such as pedicle screws, dynamic hip screws, etc., as internal fixation implants for the spine and hip, have been maturely used in the treatment of fractures or bone deformation. Bone screws are usually inserted into the bone for fixation, but for the bone, the elastic modulus of the bone screw is too large, and the phenomenon of stress shielding will occur after implantation, which will affect the growth of the bone. Because the elastic modulus of traditional titanium alloy medical screws is quite different from that of real bones and has poor compatibility with human bone tissue, it is easy to have stress concentration after surgery, which will eventually lead to the loss of implants or secondary dam...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 梁春永纪瑞龙王洪水邹显睿陈超魏晋发雒永超
Owner HEBEI UNIV OF TECH
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