Woven prosthesis and method for manufacturing the same
First Claim
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1. A method for manufacturing an implantable medical prosthesis, the medical prosthesis comprising a first end and a second end, the method comprising:
- weaving a woven base from a set of warp yarns and at least one weft yarn pass, the set of warp yarns comprises warp yarns woven as base warp yarns and warp yarns woven as non-base warp yarns, wherein the base warp yarns and weft yarn passes are woven into a base weave pattern, and the non-base warp yarns are woven with at least one weft yarn pass with a smaller frequency of interlacing when not woven into a base weave pattern; and
incorporating into the woven base one or more of the non-base warp yarns through an increase in the frequency of interlacing of the non-base warp yarns along the longitudinal direction of the base warp yarns.
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Abstract
A woven prosthesis, such as a woven vascular graft, woven from warp and weft yarns. Velour warp yarns forming the prosthesis are selectively incorporated into a base layer of the prosthesis so as to provide a bulbous section without compromising the porosity of the prosthesis.
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Citations
28 Claims
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1. A method for manufacturing an implantable medical prosthesis, the medical prosthesis comprising a first end and a second end, the method comprising:
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weaving a woven base from a set of warp yarns and at least one weft yarn pass, the set of warp yarns comprises warp yarns woven as base warp yarns and warp yarns woven as non-base warp yarns, wherein the base warp yarns and weft yarn passes are woven into a base weave pattern, and the non-base warp yarns are woven with at least one weft yarn pass with a smaller frequency of interlacing when not woven into a base weave pattern; and incorporating into the woven base one or more of the non-base warp yarns through an increase in the frequency of interlacing of the non-base warp yarns along the longitudinal direction of the base warp yarns. - View Dependent Claims (2, 3, 4, 5, 24, 25, 26)
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6. A method for manufacturing an implantable medical prosthesis comprising:
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weaving a woven base comprising base warp yarns interwoven with weft yarn passes, the base at least partially forming smaller and larger diameter portions, one or more velour yarns forming part of both the smaller and larger diameter portions, weaving in at least a portion of the larger diameter portion at least one of the one or more velour yarns of the smaller diameter portion into the woven base to adopt the base weave pattern, and; sterilizing the woven base and the one or more velour yarns forming part of both the smaller and larger diameter portions. - View Dependent Claims (7, 10, 11)
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8. A method for weaving a variable diameter generally elongate graft configured for implantation and/or anastomosis by a surgeon, the elongate graft having a velour layer on at least a portion of the graft, the method comprising the step of:
changing a weave pattern of a warp yarn used to form the velour layer in a smaller diameter portion of the elongate graft such that in the larger diameter portion of the graft, said warp yarn (i) takes on a different weave pattern than the weave pattern said warp yarn utilizes in the smaller diameter portion and (ii) forms part of a base layer of the larger diameter portion of the elongate graft. - View Dependent Claims (9)
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12. A method for weaving a medical prosthesis, comprising the steps of:
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(i) forming a first portion of the prosthesis by interweaving base warp yarns, velour warp yarns, and one or more weft yarn passes; (ii) shifting at least a pair of adjacent base warp yarns so as to increase or decrease a spacing between them; and (iii) forming a base layer of a second portion of the prosthesis by weaving the one or more weft yarn passes with the at least a pair of shifted base warp yarns together with one or more of the velour warp yarns; wherein the medical prosthesis is configured as a conduit, and the first portion is capable of establishing a diameter of a first magnitude and the second portion is capable of establishing a diameter of a second magnitude greater than the first magnitude, and wherein an average base warp yarn density is maintained within a predetermined range in both the first and second portions of the medical prosthesis, while the velour warp yarn density is decreased in the second portion as compared to the first portion of the medical prosthesis. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for manufacturing an implantable medical prosthesis comprising:
weaving a tubular prosthesis with at least one weft yarn and a plurality of warp yarns, all or a portion of the warp yarns are woven as base warp yarns, velour warp yarns, or both velour and base warp yarns, and wherein the weaving occurs in a longitudinal direction from a smaller diameter portion to a larger diameter portion while maintaining within a predetermined range an average base warp yarn density while decreasing a velour warp yarn density. - View Dependent Claims (22, 23, 27, 28)
Specification