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Directionally degradable and absorbable magnesium bone screw and preparation method thereof

A technology of bone screw and magnesium metal, applied in the field of magnesium metal bone screw and its preparation, can solve the problems of poor bonding force, easy falling off, complicated coating technology and process, and achieve the effect of ensuring integrity and maintaining early tightening force

Active Publication Date: 2015-11-18
SUZHOU ORIGIN MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating technology is generally more complicated. When most coatings are used for bone screws, there are problems such as poor bonding force and easy falling off during the screwing process of the screw.

Method used

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  • Directionally degradable and absorbable magnesium bone screw and preparation method thereof
  • Directionally degradable and absorbable magnesium bone screw and preparation method thereof
  • Directionally degradable and absorbable magnesium bone screw and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] More than 99.98% pure magnesium ingot is used to extrude into rods at 100°C, the extrusion ratio is 20, the extruded rods are discharged at a speed of 20mm / min, the taper of the discharge port is 180°, and there is no lubrication. XRD analysis was carried out on the extruded rod, and it was found that the (10-11) crystal plane had the strongest diffraction peak in the cross section of the extruded rod, and the (10-11) crystal plane had the strongest diffraction peak on the longitudinal section, as shown in Figure 6 Shown in (a) and (b) parts.

[0043] Afterwards, the above-mentioned pure magnesium hot extruded rod is subjected to further cold extrusion at an extrusion temperature of 80° C., and the cross-sectional area of ​​the rod after extrusion is reduced to 95% of its original value. Further analysis by XRD found that the intensity of the diffraction peaks of the (10-10) and (0002) crystal planes in the cross-section of the bar after cold working was significantly ...

Embodiment 2

[0048] The Mg-5.4Zn alloy is used to extrude into rods at 300° C., the extrusion ratio is 60, and the extrusion speed of the rods is 10 mm / min. According to the XRD analysis of the extruded rod, it is found that the (10-11) crystal plane diffraction peak is the strongest in the cross section of the extruded rod, and the (10-11) crystal plane diffraction peak is also the strongest in the longitudinal section.

[0049] Afterwards, the above-mentioned extruded bar is further cold-rolled at a rolling temperature of 40° C., and the cross-sectional area of ​​the bar is reduced to 50% of the original after rolling. Further analysis by XRD found that the intensity of the diffraction peaks of the (10-10) and (0002) crystal planes in the cross-section of the rolled bar increased, and the intensity was 60% of that of the (10-11) crystal plane, but still lower than that of the (10-10) crystal plane. -11) Plane strength, that is, the (10-11) crystal plane has a dominant orientation on the ...

Embodiment 3

[0054] Mg-0.8Mn-1Zn alloy is used, extruded into rods at 500°C, the extrusion ratio is 100, the extruded rods are discharged at a speed of 5mm / min, the taper of the discharge port is 170°, and there is no lubrication. According to the XRD analysis of the extruded rod, it is found that the (10-11) crystal plane diffraction peak is the strongest in the cross section of the extruded rod, and the (10-11) crystal plane diffraction peak is also the strongest in the longitudinal section.

[0055] Afterwards, the above-mentioned extruded rods are further cold-extruded at a room temperature of 25° C., and the cross-sectional area of ​​the rods is reduced to 40% of the original after extrusion. Further analysis by XRD found that the intensity of the diffraction peaks of the (10-10) and (0002) crystal planes in the cross-section of the rod after cold extrusion increased, and the intensity was 55% of that of the (10-11) crystal plane, but still lower than ( 10-11) plane strength, that is,...

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Abstract

The invention provides a directionally degradable and absorbable magnesium bone screw and a preparation method thereof. The magnesium bone screw comprises a bone screw, wherein the bone screw is made of pure magnesium or a magnesium alloy and has a thread, and the bone screw has different microstructure advantage orientations in the cross section and the longitudinal section respectively, so that the cross section is degraded faster than the longitudinal section during degradation and absorption of the bone screw. The microstructure advantage orientations of the bone screw made of the pure magnesium and the magnesium alloy are changed, so that certain crystal faces have advantage orientations in certain directions and have different microstructures in different directions, different degradation behaviors of different crystal faces of the magnesium and the magnesium alloy are fully utilized, and the degradation rate of the bone screw and growth of bone tissue are regulated to be well matched. The bone screw has different degradation rates in axial and radial directions, so that the bone screw has the characteristic of directional degradation, the intactness of the thread structure can be guaranteed at the early stage of implantation, and the early-stage pre-tightening force of the bone screw can be kept.

Description

technical field [0001] The invention relates to a device in the technical field of implantable medical devices and a preparation method thereof, in particular to a magnesium metal bone screw capable of directional degradation and absorption by a human body and a preparation method thereof. Background technique [0002] Bone screws are widely used in orthopedics clinically for internal fixation of fractures, osteotomy fixation and other operations, and have a wide range of uses. However, currently clinically used bone screws are basically composed of stainless steel, titanium or titanium alloys, and some absorbable polymer materials, and there are some insurmountable problems. The elastic modulus of metal materials such as titanium alloy and stainless steel is much larger than that of human compact bone. After the fracture is fixed, it is easy to produce a stress shielding effect around the implant site, which may cause osteoporosis and reduce the effect of surgical treatment...

Claims

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Application Information

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IPC IPC(8): A61L31/02A61L31/14
Inventor 张绍翔张小农刘静怡张元壮徐海东赵常利倪嘉桦王晓姜曼
Owner SUZHOU ORIGIN MEDICAL TECH
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