Patent US4074366A successfully refreshed from Google Patents.
US4074366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(N-acetyl-D-glucosamine) products
Assignee: Wyeth Holdings LLC
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Filing: 1976-07-22
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Granted: 1978-02-21
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Expires: 1996-07-22
Abstract
Abstract Poly(N-acetyl-D-glucosamine) is soluble in hexafluoroisopropyl alcohol and hexafluoracetone sesquihydrate. The solutions formed may be wet or dry spun into filaments, or cast into films or solid articles, which may be used as absorbable surgical sutures, or other absorbable surgical elements. Poly(N-acetyl-D-glucosamine) is enzymatically degradable in living tissue, and is resistant to hydrolytic degradation, and, therefore, surgical elements thereof have good storage characteristics under a wide variety of conditions.
Inventors
- 👤 Richard Carl Capozza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:20
CPC Classifications
D; D01; D01F; D01F9/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; A61L27/00; A61L27/14; A61L27/20; C; C08; C08L; C08L5/00; C08L5/08; Y; Y10; Y10S; Y10S606/00; Y10S606/907; Y10S606/908; Y10S606/91
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
A surgical prosthesis comprising non-absorbable filaments shaped as a living tissue reinforcing element, and mixed with and coacting with said non-absorbable filaments, in at least a part of the element, a structure consisting essentially of poly(N-acetyl-D-glucosamine), whereby on implantation in living tissue, the poly(N-acetyl-D-glucosamine) is absorbed by the living tissue which replaces the poly(N-acetyl-D-glucosamine) and interlocks with the non-absorbable filaments, said prosthesis being sterile at time of implantation.
Claim 2
Dependent Claim
68 words
A surgical prosthesis comprising non-absorbable filaments shaped as a living tissue reinforcing element, and mixed with and coacting with said non-absorbable filaments, in at least a part of the element, a structure consisting essentially of poly(N-acetyl-D-glucosamine), whereby on implantation in living tissue, the poly(N-acetyl-D-glucosamine) is absorbed by the living tissue which replaces the poly(N-acetyl-D-glucosamine) and interlocks with the non-absorbable filaments, said prosthesis being sterile at time of implantation.
Claim 3
Dependent Claim
54 words
The prosthesis of claim 1 in which the reinforcing element comprises a non-absorbable strand fabric mesh section, and interwoven and graded thereinto, bicomponent strands in a graded transition portion, the individual strands of which are of proportionately increasing poly(N-acetyl-D-glucosamine) and decreasing non-absorbable filament composition, at increasing distances from said non-absorbable strand fabric mesh section.
Claim 4
Dependent Claim
97 words
An absorbable prosthesis for the anastomosis of vessels in the tissue of a living mammal consisting essentially of a hollow cylinder of poly(N-acetyl-D-glucosamine), having an inner diameter approximately the same as the inner diameter of the subject vessel, and a smooth outer surface of a diameter which is insertable in said vessel when stretched, whereby one end of a vessel from traumatic or surgical severance may be emplaced over each end of said cylinder, and fixedly positioned thereon, said cylinder being open to and permitting the flow of body fluids and being absorbable by living mammalian tissue.
Claim 5
Dependent Claim
97 words
An absorbable prosthesis for the anastomosis of vessels in the tissue of a living mammal consisting essentially of a hollow cylinder of poly(N-acetyl-D-glucosamine), having an inner diameter approximately the same as the inner diameter of the subject vessel, and a smooth outer surface of a diameter which is insertable in said vessel when stretched, whereby one end of a vessel from traumatic or surgical severance may be emplaced over each end of said cylinder, and fixedly positioned thereon, said cylinder being open to and permitting the flow of body fluids and being absorbable by living mammalian tissue.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |