Methods of orienting multifilament yarn and monofilaments of poly-4-hydroxybutyrate and copolymers thereof
First Claim
1. A multifilament yarn or monofilament fiber comprising a 4-hydroxybutyrate polymer or copolymerwherein the yarn has a tenacity greater than 8.1 grams per denier but less than 12 grams per denier;
- and one or more properties selected from the group consisting of;
an elongation to break of between 10% to 30%; and
a denier per filament between 1.7 and 9.0, andwherein the monofilament fiber has a tensile strength between 800 MPa and 1,500 MPa and a minimum knot pull tensile strength greater than 0.25 kgf; and
one or more properties selected from the group consisting of;
a Young'"'"'s Modulus of less than 2 GPa and an elongation to break of 15% to 120%.
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Accused Products
Abstract
Resorbable multifilament yarns and monofilament fibers including poly-4-hydroxybutyrate and copolymers thereof with high tenacity or high tensile strength have been developed. The yarns and fibers are produced by cold drawing the multifilament yarns and monofilament fibers before hot drawing the yarns and fibers under tension at temperatures above the melt temperature of the polymer or copolymer. These yarns and fibers have prolonged strength retention in vivo making them suitable for soft tissue repairs where high strength and strength retention is required. The multifilament yarns have tenacities higher than 8.1 grams per denier, and in vivo, retain at least 65% of their initial strength at 2 weeks. The monofilament fibers retain at least 50% of their initial strength at 4 weeks in vivo. The monofilament fibers have tensile strengths higher than 500 MPa. These yarns and fibers may be used to make various medical devices for various applications.
170 Citations
38 Claims
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1. A multifilament yarn or monofilament fiber comprising a 4-hydroxybutyrate polymer or copolymer
wherein the yarn has a tenacity greater than 8.1 grams per denier but less than 12 grams per denier; - and one or more properties selected from the group consisting of;
an elongation to break of between 10% to 30%; and
a denier per filament between 1.7 and 9.0, andwherein the monofilament fiber has a tensile strength between 800 MPa and 1,500 MPa and a minimum knot pull tensile strength greater than 0.25 kgf; and
one or more properties selected from the group consisting of;
a Young'"'"'s Modulus of less than 2 GPa and an elongation to break of 15% to 120%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 37, 38)
- and one or more properties selected from the group consisting of;
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35. A multifilament yarn or monofilament fiber comprising a 4-hydroxybutyrate polymer or copolymer
wherein the yarn has one or more properties selected from the group consisting of: - a tenacity greater than 8.1 grams per denier but less than 12 grams per denier;
an elongation to break of between 10% to 30%; and
a denier per filament between 1.7 and 9.0, andwherein the monofilament fiber has one or more properties selected from the group consisting of;
a tensile strength between 500 MPa and 1,500 MPa;
a Young'"'"'s Modulus of less than 2 GPa and an elongation to break of 15% to 120%,wherein the multifilament yarn or monofilament fiber is produced by a method comprising (a) spinning a multifilament yarn or monofilament fiber comprising a 4-hydroxybutyrate polymer or copolymer, and (b) cold drawing the multifilament yarn or monofilament fiber, wherein the multifilament yarn or monofilament fiber is hot drawn after cold drawing at a temperature above the melt temperature of the polymer or copolymer, wherein the monofilament fiber is cold drawn with an orientation ratio of 3 to 4, and then hot drawn in one or more subsequent draws. - View Dependent Claims (36)
- a tenacity greater than 8.1 grams per denier but less than 12 grams per denier;
Specification