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A kind of preparation method of double-layer structure bone screw

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

Active Publication Date: 2021-04-27
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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  • A kind of preparation method of double-layer structure bone screw
  • A kind of preparation method of double-layer structure bone screw
  • A kind of preparation method of double-layer structure bone screw

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 double-layer structure bone screw suitable for fracture connection of osteoporotic bone, bone lesion and bone deformity correction. In the present invention, through three steps of designing and optimizing the prism structure of the inner layer of the bone screw, designing and optimizing the outer structure of the bone screw, and printing the overall structure of the bone screw, a bone screw with a double-layer structure is prepared. The bone screw is guaranteed to have elasticity close to bone Modulus performance while still maintaining sufficient torque to meet application demands. The bone screw provided by the invention solves the problem of mismatching mechanical properties of the bone screw, effectively reduces the stress shielding effect brought by the traditional bone screw; proposes a porous structure design method of the bone screw, in order to seek to promote the rapid recovery of fractured bones and avoid The design method and processing method of the bone screw for secondary injury to the bone after operation provide a new idea; solve the problem that the traditional manufacturing method cannot make complex bone screws.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
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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