US4987665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic tubular article
Assignee: Covidien AG
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Filing: 1988-03-22
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Granted: 1991-01-29
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Expires: 2008-03-22
Abstract
Abstract The invention involves a method to texturize absorbable or absorbable/nonabsorbable components that are to be used to fabricate textile grafts of all sizes, and specifically for repair of the peripheral vascular system and for coronary bypass use. The bioabsorbable component of the graft fosters increased tissue ingrowth into the graft as compared to conventional 100% nonabsorbable grafts. Increased tissue ingrowth leads to greater patency through formation of a vascularized neointima and less tendency to be aneurysmal through formation of a suitable adventitia. The absorbable component can be a variety of materials, including PGA, the polymer used to manufacture the MAXON™ suture, etc., whereas the nonabsorbable component (to be used as the backbone) can be new materials, e.g. the polymer used to manufacture the NOVAFIL® suture, or more conventional polymers, including polyester, polyamide or polypropylene.
Inventors
- 👤 Barry L. Dumican
- 👤 Barbara Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:37
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F2/08; A61L; A61L27/00; A61L27/14; A61L27/18; A61L27/26; A61L27/50; A61L27/58; D; D02; D02G; D02G1/00; D04; D04C; D04C1/00; D04C1/02; D04C1/06; D04C1/12; D10; D10B; D10B2403/00; D10B2403/03; D10B2403/031; D10B2403/0311; D10B2509/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
90 words
A method of texturizing a plurality of fibers or yarns comprising: (1) deforming the plurality of fibers or yarns by twisting in one direction; (2) setting the deformation of said plurality of fibers or yarns from step (1) by twisting in the opposite direction without removing the deformation; (a) heating them to their glass transition temperature under a vacuum of up to about 5 torr; and (b) cooling the fibers or yarns to ambient temperature; and (3) mechanically removing the twist inserted in the fibers or yarns from step (1).
Claim 2
Independent Claim
90 words
A method of texturizing a plurality of fibers or yarns comprising: (1) deforming the plurality of fibers or yarns by twisting in one direction; (2) setting the deformation of said plurality of fibers or yarns from step (1) by twisting in the opposite direction without removing the deformation; (a) heating them to their glass transition temperature under a vacuum of up to about 5 torr; and (b) cooling the fibers or yarns to ambient temperature; and (3) mechanically removing the twist inserted in the fibers or yarns from step (1).
Claim 3
Dependent Claim
20 words
A method of claim 1 wherein the vacuum in the heating step is at or less than about 1 torr.
Claim 4
Dependent Claim
21 words
A method of claim 1 wherein the relative humidity of the atmosphere in the heating step is up to about 25%.
Claim 5
Dependent Claim
17 words
A method of claim 3 wherein said relative humidity of said atmosphere is up to about 15%.
Claim 6
Dependent Claim
14 words
A method of claim 4 wherein said relative humidity is less than about 5%.
Claim 7
Independent Claim
111 words
A method of texturizing a plurality of fibers or yarns comprising: (1) deforming the plurality of fibers or yarns by twisting in one direction; (2) setting the deformation of said plurality of fibers or yarns from step (1) by (a) heating them to a temperature of from about 100° to 190° C. under a vacuum of up to about 5 torr; (b) cooling the fibers or yarns to ambient temperature; and (3) mechanically removing the twist inserted in the fibers or yarns fronm step (1) by twisting in the opposite direction without removing the deformation; fibers or yarns from step (1) by twisting in the opposite direction without removing the deformation;
Claim 8
Independent Claim
111 words
A method of texturizing a plurality of fibers or yarns comprising: (1) deforming the plurality of fibers or yarns by twisting in one direction; (2) setting the deformation of said plurality of fibers or yarns from step (1) by (a) heating them to a temperature of from about 100° to 190° C. under a vacuum of up to about 5 torr; (b) cooling the fibers or yarns to ambient temperature; and (3) mechanically removing the twist inserted in the fibers or yarns fronm step (1) by twisting in the opposite direction without removing the deformation; fibers or yarns from step (1) by twisting in the opposite direction without removing the deformation;
Claim 9
Dependent Claim
18 words
A method of claim 27 wherein the temperature in the heating step is about 120° to 140° C.
Claim 10
Dependent Claim
20 words
A method of claim 7 wherein the vacuum in the heating step is at or less than about 1 torr.
Claim 11
Dependent Claim
22 words
A method of claim 6 wherein the relative humidity of the atmosphere in the heating step is from about 5 to 25%.
Claim 12
Dependent Claim
18 words
A method of claim 9 wherein said relative humidity of said atmosphere is from about 5 to 15%.
Claim 13
Dependent Claim
21 words
A method of claim 6 wherein the relative humidity of the atmosphere in the heating step is less than about 5%.
Claim 14
Dependent Claim
40 words
A method of claim 1 or claim 2 comprising after the removing step: (4) resetting the plurality of fibers or yarns from step (3) by (a) reheating and then (b) recooling them as described in steps (2)(a) and (b), respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |