Polyhydroxyalkanoate medical textiles and fibers
First Claim
1. A method for producing fiber comprising a poly-4-hydroxybutyrate polymer or copolymer wherein the fiber has a tensile strength of greater than 126 MPa, comprisingquenching the fiber following extrusion at a temperature that is greater than the glass transition temperature of the polymer,orienting the fiber at a temperature above the polymer'"'"'s glass transition temperature by spinning, allowing the polymer time to crystallize, and then drawing the polymer or copolymer to yield a fiber with a tensile strength greater than 126 MPa.
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Accused Products
Abstract
Absorbable polyester fibers, braids, and surgical meshes with prolonged strength retention have been developed. These devices are preferably derived from biocompatible copolymers or homopolymers of 4-hydroxybutyrate. These devices provide a wider range of in vivo strength retention properties than are currently available, and could offer additional benefits such as anti-adhesion properties, reduced risks of infection or other post-operative problems resulting from absorption and eventual elimination of the device, and competitive cost. The devices may also be particularly suitable for use in pediatric populations where their absorption should not hinder growth, and provide in all patient populations wound healing with long-term mechanical stability. The devices may additionally be combined with autologous, allogenic and/or xenogenic tissues to provide implants with improved mechanical, biological and handling properties.
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Citations
20 Claims
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1. A method for producing fiber comprising a poly-4-hydroxybutyrate polymer or copolymer wherein the fiber has a tensile strength of greater than 126 MPa, comprising
quenching the fiber following extrusion at a temperature that is greater than the glass transition temperature of the polymer, orienting the fiber at a temperature above the polymer'"'"'s glass transition temperature by spinning, allowing the polymer time to crystallize, and then drawing the polymer or copolymer to yield a fiber with a tensile strength greater than 126 MPa.
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2. A method for producing a multifilament yarn fiber comprising providing multiple fibers, at least one fiber comprising a poly-4-hydroxybutyrate polymer or copolymer made by a process comprising
quenching the fiber following extrusion at a temperature that is greater than the glass transition temperature of the polymer, orienting the fiber at a temperature above the polymer'"'"'s glass transition temperature by spinning, allowing the polymer time to crystallize, and then drawing the polymer or copolymer to yield a fiber having a tensile strength of greater than 126 MPa wherein the yarn is spun and drawn to yield a yarn with a tenacity of greater than 0.5 g/denier.
Specification