Patent US4433688A successfully refreshed from Google Patents.
US4433688A
Expired / Lapsed
US
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Method of coating a catgut suture
Assignee: Assut SA
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Filing: 1983-01-04
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Granted: 1984-02-28
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Expires: 2003-01-04
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
2026-10-24 12:16
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: 9
Claim 1
Independent Claim
77 words
A method for obtaining a sheathed catgut suture filament comprising the following steps: Polymerizing at least one diacid with one or more of an equivalent of at least one polyol, thus providing a hydroxylated polyester, Capping said polyester with between one and two equivalents of at least one polyisocyanate, thus providing an isocyanate capped polymer, Capping a catgut filament with at least one layer of the isocyanate capped polymer, and Curing said coated filament in non-dry conditions.
Claim 2
Independent Claim
77 words
A method for obtaining a sheathed catgut suture filament comprising the following steps: Polymerizing at least one diacid with one or more of an equivalent of at least one polyol, thus providing a hydroxylated polyester, Capping said polyester with between one and two equivalents of at least one polyisocyanate, thus providing an isocyanate capped polymer, Capping a catgut filament with at least one layer of the isocyanate capped polymer, and Curing said coated filament in non-dry conditions.
Claim 3
Dependent Claim
27 words
The method of claim 1, which comprises using n equivalents of the diacid and n+1 equivalents of the polyol, n being comprised between about 1.1 and 20.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein the polyol is a diol.
Claim 5
Dependent Claim
30 words
The method of claim 1, wherein the polyol is a mixture of a diol and 0.5 to 10% by weight of a polyol selected from triols, tetrols and hydrogenated sugars.
Claim 6
Dependent Claim
24 words
The method of claim 1, which comprises using from about 1.1 to 1.5 equivalent of polyisocyanate for one equivalent of the said hydroxylated polyester.
Claim 7
Dependent Claim
19 words
The method of claim 5, wherein the polyisocyanate is a diisocyanate selected among p-tolylene diisocyanate and 2,4-toluene diisocyanate (TDI).
Claim 8
Dependent Claim
56 words
The method of claim 1, wherein said capping step also involves chain extension of the hydroxylated polyester by reaction with the polyisocyanate and said curing step also involves adhesion of the coating to the catgut core by the formation of urea and urethane bridging with the free --NH 2 and --OH groups of the catgut collagen.
Claim 9
Dependent Claim
25 words
The method of claim 1, comprising carrying out the curing by standing in ordinary air at room temperature or by heating in a moisture oven.
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) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |