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Full-thread degradable pure-magnesium bolt

A full-thread and screw technology, applied in the field of medical implants, can solve the problems of easy deformation and fracture, insufficient post-pressurization force, insufficient holding force of magnesium screws, etc., to reduce deformation and fracture, low cost, good holding and fixing effect Effect

Inactive Publication Date: 2015-01-07
赵德伟 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problems of insufficient holding force, insufficient post-applying pressure, and easy deformation and fracture of the existing magnesium screws proposed above, and researches and designs a fully threaded degradable pure magnesium screw, which is self-degradable, low in price, and has a high Histocompatibility and biomechanical properties, and can induce osteogenesis

Method used

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  • Full-thread degradable pure-magnesium bolt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A pre-thread degradable pure magnesium screw, the length of the body 1 is 25mm, the angle between the surface connecting the nut 2 and the body 1 and the center line of the body is 22°, the thickness of the nut 2 is 3mm, and the thread width is 0.5mm , the thread pitch is 0.55mm, the thread depth is 1 / 10 of the body diameter, the thread lead angle is 5°, the flank angle α is 50°, the top angle of the screw front end 12 is 120°, and the length of the screw front end 12 is 1.3mm.

[0035] The pure magnesium composition used in this embodiment is: Mg: 99.99%; Al: 0.002%; Si: 0.0007%; Ca: 0.0003%; Ti: 0.0001%; ​​Mn: 0.002%; Cu: 0.0002%; Zn: 0.0028%; Pb: 0.0008%.

Embodiment 2

[0037] A front-thread degradable pure magnesium screw, the length of the body 1 is 28mm, the angle between the surface connecting the nut 2 and the body 1 and the center line of the body is 26°, the thickness of the nut 2 is 3.5mm, and the thread width is 0.6 mm, the thread pitch is 0.65mm, the thread depth is 1 / 7 of the body diameter, the thread lead angle is 10°, the flank angle α is 40°, the top angle of the screw front end 12 is 90°, and the length of the screw front end 12 is 1.4mm .

[0038] The pure magnesium composition used in this embodiment is: Mg: 99.99%; Al: 0.002%; Si: 0.001%; ​​Ca: 0.00005%; Ti: 0.00005%; Mn: 0.002%; Cu: 0.0002%; Zn: 0.0028%; Pb: 0.0008%.

Embodiment 3

[0040]A pre-thread degradable pure magnesium screw, the length of the body 1 is 30mm, the angle between the surface connecting the nut 2 and the body 1 and the center line of the body is 30°, the thickness of the nut 2 is 4mm, and the thread width is 0.7mm , the thread pitch is 0.75mm, the thread depth is 1 / 5 of the body diameter, the thread lead angle is 20°, the flank angle α is 30°, the top angle of the screw front end 12 is 30°, and the length of the screw front end 12 is 1.5mm.

[0041] The pure magnesium composition used in this embodiment is: Mg: 99.99%; Al: 0.002%; Si: 0.00008%; Ca: 0.001%; ​​Ti: 0.0001%; ​​Mn: 0.002%; Cu: 0.0002%; Zn: 0.0028%; Pb: 0.0008%.

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Abstract

The invention discloses a full-thread degradable pure-magnesium bolt, and relates to the field of medical implants. The full-thread degradable pure-magnesium bolt comprises a body and a nut, wherein threads are formed in the body; a profile counter bore is formed in the nut. The full-thread degradable pure-magnesium bolt is characterized in that the ratio of the length of the threads to the length of the body is 1:1; the nut is a tension nut; and the inclination angle between the side, connected with the body, of the tension nut and the center line of the body is 22 degrees to 30 degrees. The full-thread degradable pure-magnesium bolt can be degraded automatically, is low in cost, has higher histocompatibility and higher biomechanical property, can induce the generation of bone tissues, and can meet the requirements of patients.

Description

technical field [0001] The invention relates to a medical implant, in particular to a medically implanted full-thread degradable pure magnesium screw for treating necrosis of the femoral head. Background technique [0002] At present, articular surface collapse of the femoral head or necrosis of the femoral head is a common clinical disease. At present, the method of drilling and decompression is often used for treatment. During the operation, the sequestrum needs to be removed before filling the support for the collapsed or necrotic femoral head implants; Bone flaps with or without blood vessels are used for transfer therapy. Through a large number of experiments and clinical evidence, simple bone grafts have disadvantages such as bone flap prolapse, insufficient biomechanical support, and bone resorption. Therefore, it is necessary to have a device that can provide fixation and promote bone ingrowth. bone implants. [0003] At present, the common implant fixation materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/86A61L31/02
CPCA61B17/742A61L31/022A61L31/148
Inventor 赵德伟黄诗博王本杰秦岭李扬德
Owner 赵德伟
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