Medical degradable magnesium alloy bone-fixing screw

A technology of fixation screw and magnesium alloy, which is applied in the field of bone fixation screws, can solve the problems that bone fixation screws cannot be degraded, and achieve the effects of avoiding stress shielding effect, less tissue reaction, and reducing trauma

Inactive Publication Date: 2012-12-12
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a medical degradable magnesium alloy bone fixat

Method used

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  • Medical degradable magnesium alloy bone-fixing screw
  • Medical degradable magnesium alloy bone-fixing screw

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specific Embodiment approach 1

[0021] Embodiment 1: In this embodiment, the degradable magnesium alloy bone fixation screw includes a degradable magnesium alloy.

[0022] The beneficial effect of this embodiment is:

[0023] 1) Magnesium is one of the most abundant metal elements on the earth and one of the most abundant cations in the human body. It is an indispensable and important nutritional element for the human body. As a new type of biomedical material, magnesium alloy has good medical properties. It is a safe foundation and has the following medical advantages: 1) The elastic modulus and yield strength of Mg are closer to those of human bone, and the density is also very similar to that of human bone, which can effectively avoid the stress shielding effect; 2) Magnesium Alloys are basic elements in human metabolism and bone tissue, and have better biocompatibility; 3) Magnesium has a very low equilibrium electrode potential, especially in a solution containing Cl, which is easily corroded and degrad...

specific Embodiment approach 2

[0030] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the degradable magnesium alloy is composed of Mg-Ca alloy, Mg-Sn-Mn alloy or Mg-Sn-Mn-Zn alloy. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that the weight percentage of Ca in the Mg-Ca alloy is 1%-30%. Others are the same as one of the specific embodiments 1 to 2.

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Abstract

A medical degradable magnesium alloy bone-fixing screw relates to bone-fixing screws and solves the problem that the existing bone-fixing screws are non-degradable. The medical degradable magnesium alloy bone-fixing screw is made of degradable magnesium alloy. The medical degradable magnesium alloy bone-fixing screw is fine in biocompatibility, has few tissue reaction and fine metal mechanical performance, can be absorbed in vivo without one more operation for removing the screws, relieves wound, reduces infection rate, saves cost, and has no metal stimulation, and degrading of the medical degradable magnesium alloy bone-fixing screw avoids metal stress shielding and reduces risks of osteoporosis after operation. The medical degradable magnesium alloy bone-fixing screw can be completely biodegraded to become harmless micromolecule after in vivo planting and the micromolecule can be discharged in vitro or absorbed in vivo, and accordingly rejection reaction of human bodies to implant is reduced and better curative effect is achieved.

Description

technical field [0001] The invention relates to a bone fixation screw. Background technique [0002] In clinical surgery, bone transplantation, joint fusion, joint fixation, orthopedics are often used to treat diseases such as fractures and bone repair, and fixation is usually used in surgery. At present, metal fixation screws (stainless steel, titanium alloy, etc.) are mostly used in clinical internal fixation of fractures. Such metal fixation screws have high mechanical properties, but they cannot be absorbed by the body because they are not degradable. A second operation is required to remove the fixation, which increases the patient's secondary pain and economic burden. An internal fixation bone screw invented by Bao Kan in patent 00134945.7 has better fixation effect; the inventor Lin Zhixiong in patent 02206086.3 has improved the structure of the bone nail and is suitable for materials with poor mechanical properties or brittle materials, but they The bone nail mater...

Claims

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Application Information

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IPC IPC(8): A61L31/02A61L31/14A61L31/10C22C23/00A61B17/86
Inventor 李莉郑玉峰李新林李珍侯理达刘西伟
Owner HARBIN ENG UNIV
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