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Carbon fiber reinforced poly(ether-ether-ketone) composite bone fracture plate

A composite material, polyether ether ketone technology, applied in medical science, surgery, fixation, etc., can solve problems such as osteoporosis and refracture, and achieve the effect of reducing pain, reducing economic burden, and reducing medical costs

Inactive Publication Date: 2007-01-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of osteoporosis and refracture after healing caused by the mismatch of elastic modulus with human bone in the existing metal bone plate, the object of the present invention is to provide a composite material bone plate, namely Carbon fiber reinforced polyether ether ketone composite bone plate, which can adjust the strength and modulus of the material within a certain range by adjusting the fiber content to match the mechanical properties of human bone, and it is resistant to body fluid corrosion and fatigue resistance metal alloy bone plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Material: polyacrylonitrile-based carbon fiber, tensile strength 3200MPa, tensile modulus 220GPa, length 10mm, diameter 7μm; PEEK450G pellets.

[0017] Molding process: mix carbon fiber and PEEK450G pellets evenly according to the mass percentage of carbon fiber 20%, extrude pellets on a parallel twin-screw extruder at a temperature of 633-663K; inject the above pellets on an injection molding machine at an injection temperature of 633-663K, the mold temperature is 433K. A bone plate with a length of 135mm and a cross section of 16×4.8mm was manufactured, with a strength of 187MPa and a modulus of 15.0GPa.

Embodiment 2

[0019] Material: polyacrylonitrile-based carbon fiber, tensile strength 3200MPa, tensile modulus 220GPa, length 10mm, diameter 7μm; PEEK450G pellets.

[0020] Molding process: mix carbon fiber and PEEK450G pellets evenly according to the mass percentage of carbon fiber 25%, extrude pellets on a parallel twin-screw extruder at a temperature of 643-668K; inject the above pellets on an injection molding machine at an injection temperature of 643-668K, the mold temperature is 443K. A bone plate with a length of 135mm and a cross-section of 16×4.8mm was manufactured, with a strength of 206MPa and a modulus of 18.1GPa.

Embodiment 3

[0022] Material: polyacrylonitrile-based carbon fiber, tensile strength 3200MPa, tensile modulus 220GPa, length 10mm, diameter 7μm; PEEK450G pellets.

[0023] Molding process: mix carbon fiber and PEEK450G pellets uniformly according to the mass percentage of carbon fiber 30%, extrude pellets on a parallel twin-screw extruder at a temperature of 648-673K; inject the above pellets on an injection molding machine at an injection temperature of 648-673K, the mold temperature is 453K. A bone plate with a length of 135mm and a cross-section of 16×4.8mm was manufactured, with a strength of 225MPa and a modulus of 21.1GPa.

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Abstract

A bone setting-up plate is made up of the carbon fibre reinforced polyether etherone. Said carbon fibre has a mass ratio of 20-40%, tension strength greater than 300 MPa and tension modulus greater than 200 GPa. It features that its elastic modulus is matched with that of human bone.

Description

Technical field: [0001] The invention belongs to the technical fields of polymer composite materials and biomedical materials. Background technique: [0002] Plate-screw fixation is a commonly used internal fixation method for fracture repair in clinical practice. The traditional bone plate is made of metal materials such as stainless steel, Co-Cr alloy or Ti alloy, which has high strength and modulus, and can provide high axial compression resistance for the fracture site, which is beneficial to fracture site Protection and early bone healing. However, the modulus of stainless steel (210-230 GPa) and Ti alloy (110 GPa) is much higher than that of bone (12-20 GPa). This mismatch in modulus leads to the metal bone plate bearing most of the stress when bearing the load, while the bone under the bone plate is in a low stress state, which is the so-called "stress shielding" effect or "stress shielding". effect. This "stress shielding" effect affects the reconstruction and he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/58A61L31/04
Inventor 隋国鑫刘学勇刘羽寅杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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