Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-08-20
1997-07-29
Edwards, Newton
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428372, 423308, 423309, 423311, D02G 300, C01B 1516
Patent
active
056520565
ABSTRACT:
A substantially pure hydroxyapatite filament provides the reinforcement for composite materials used for bone replacement and repair. Its biocompatibility and high strength reveal opportunities for strong, tough and biocompatible composites to replace diseased, fractured or missing areas of bone. One such opportunity is a hydroxyapatite fiber reinforced hydroxyapatite matrix composite. This composite has higher strength and toughness than sintered hydroxyapatite yet has excellent biocompatibilty and mechanical properties which can be tailored to mimic replaced bone. Methods for filament fabrication include low temperature extrusion of a precursor gel filament reinforced with hydroxyapatite whiskers, high temperature sinter-extrusion and high temperature glass filament formation followed by reconversion to hydroxyapatite by intermediate temperature heat treatment.
REFERENCES:
patent: 4503157 (1985-03-01), Hatahira
patent: 4880610 (1989-11-01), Constantz
patent: 4968317 (1990-11-01), Tormala et al.
patent: 5227147 (1993-07-01), Yoshimura et al.
Yoshimura et al, Processing and Mechanical Properties of Hydroxyapatite (HAP) reinforced with HAP Whiskers; 1996, pp. 1715-1723.
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