US4506672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheathed surgical suture filament and method for its preparation
Assignee: A S S U T SA
•
Filing: 1980-11-21
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Granted: 1985-03-26
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Expires: 2000-11-21
Abstract
Abstract Catgut suturing filament protected by a flexible polymer sheath that is slowly hydrolytically degradable and impervious to body fluid degratative enzymes. The sheath is prepared by coating the catgut filament with an isocyanate capped polyhydroxylated polyester followed by curing.
Inventors
- 👤 Daniel Bichon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:30
CPC Classifications
A; A61; A61L; A61L17/00; A61L17/14; A61L17/145; D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; Y; Y10; Y10S; Y10S128/00; Y10S128/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
A catgut suture filament comprising a catgut core coated with an adherent protective sheath made of a polyester based flexible resin reinforced by urea or urethane links, the sheath being hydrolytically but not enzymatically degradable.
Claim 2
Dependent Claim
35 words
A catgut suture filament comprising a catgut core coated with an adherent protective sheath made of a polyester based flexible resin reinforced by urea or urethane links, the sheath being hydrolytically but not enzymatically degradable.
Claim 3
Dependent Claim
16 words
The filament of claim 1, wherein the resin is a hydroxylated polyester capped with a polyisocyanate.
Claim 4
Dependent Claim
55 words
The filament of claim 1, wherein the resin sheath is based on polyesters containing linear segments derived from at least one glycol selected from the group consisting of aliphatic glycols of from 3 to 12 carbon atoms, cycloaliphatic glycols of from 3 to 12 carbon atoms and polyoxyalkylene glycols containing 2 to 15 polyoxyalkylene units.
Claim 5
Dependent Claim
21 words
The filament of claim 3, wherein the resin also comprises branched segments derived from hydroxy-compounds containing more than two --OH groups.
Claim 6
Dependent Claim
23 words
The filament of claim 4, wherein the branched segments derived from hydroxy-compounds are selected from the group consisting of triols, tetrols and polyols.
Claim 7
Dependent Claim
24 words
The filament of claim 4, wherein the branched segments derived from hydroxy-compounds are selected from the group consisting of glycerol, trimethylolpropane, and hydrogenated monosaccharides.
Claim 8
Dependent Claim
37 words
The filament of claim 3, wherein the polyester portion contains segments derived from diacids selected from oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, perfluoroadipic acid, 2,2-oxydiacetic acid, 2-oxoglutaric acid and D-tartaric acid.
Claim 9
Dependent Claim
24 words
The filament of claim 1, wherein the adherent protective sheath does not substantially degrade until the wound has had a sufficient time to heal.
Claim 10
Dependent Claim
21 words
The filament of claim 1, wherein the adherent protective sheath is bonded to the catgut core by urea or urethane links.
Claim 11
Dependent Claim
12 words
The filament of claim 9, wherein the bond is a covalent bond.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |