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

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Problems solved by technology

However, the coating technology is generally more complicated. When most coatings are used for bone screws,

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

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Example Embodiment

[0041] Example 1

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

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

Example Embodiment

[0047] Example 2

[0048] Using Mg-5.4Zn alloy, it was extruded into a bar at 300°C, the extrusion ratio was 60, and the discharge speed of the extruded bar was 10 mm / min. The XRD analysis of the extruded bar shows that the diffraction peak of the (10-11) crystal plane is the strongest in the cross section of the extruded bar, and the diffraction peak of the (10-11) crystal plane is also the strongest in the longitudinal section.

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

Example Embodiment

[0053] Example 3

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

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

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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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