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US4429080A
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Synthetic copolymer surgical articles and method of manufacturing the same
Assignee: Covidien AG
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Filing: 1982-07-01
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Granted: 1984-01-31
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Expires: 2002-07-01
Abstract
Abstract A triblock copolymer having a proportion of units having the formula: ##STR1## as the end blocks, and the formula (I) randomly combined with a proportion of units having the formula: ##STR2## as the middle block finds particular advantageous use in manufacturing absorbable monofilament sutures and other surgical articles. A surgical article is manufactured from a synthetic absorbable copolymer formed by copolymerizing glycolide with 1,3-dioxan-2-one (trimethylene carbonate) wherein a combination of the monomers is substantially completely polymerized before the addition of the other monomer in the presence of a difunctional initiator at or below about 180° C.; glycolide is added and the temperature increased up to about the melting point of poly glycolide to form a triblock copolymer with a proportion of units having the formula: ##STR3## as the end blocks, and the formula (I) randomly combined with a proportion of units having the formula: ##STR4## as the middle block.
Inventors
- 👤 Donald J. Casey
- 👤 Mark S. Roby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:16
CPC Classifications
A; A61; A61L; A61L17/00; C; C08; C08G; C08G63/00; C08G63/64; A61K; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2031; A61K9/204; A61L17/06; A61L17/10; A61L17/12; C08G63/02; C08G63/06; C08G63/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
A surgical article manufactured from a fiber having a bending modulus of less than 500,000 psi, said fiber manufactured from a triblock copolymer comprising a proportion of units having the formula: ##STR13## as the end blocks, said formula (I) as an end block having a hydrogen atom attached to the terminal oxygen atom, and the formula (I) randomly combined with a proportion of units having the formula: ##STR14## as the middle block wherein the middle block comprises 70-95 percent, by weight, of units of formula II and the total copolymer comprises 30-40 percent, by weight, of units of formula II.
Claim 2
Dependent Claim
100 words
A surgical article manufactured from a fiber having a bending modulus of less than 500,000 psi, said fiber manufactured from a triblock copolymer comprising a proportion of units having the formula: ##STR13## as the end blocks, said formula (I) as an end block having a hydrogen atom attached to the terminal oxygen atom, and the formula (I) randomly combined with a proportion of units having the formula: ##STR14## as the middle block wherein the middle block comprises 70-95 percent, by weight, of units of formula II and the total copolymer comprises 30-40 percent, by weight, of units of formula II.
Claim 3
Independent Claim
108 words
A method for the manufacture of a surgical article manufactured from a synthetic absorbable copolymer formed by copolymerizing glycolide with 1,3-dioxan-2-one wherein a combination of the monomers is substantially completely polymerized before the addition of the other monomer, the improvement comprising substantially completely polymerizing the combination in the presence of a difunctional initiator at about 180° C.; increasing the temperature up to about the melting point of polyglycolide; and adding glycolide to form a triblock copolymer comprising a proportion of units having the formula: ##STR15## as the end blocks, and the formula (I) randomly combined with a proportion of units having the formula: ##STR16## as the middle block.
Claim 4
Independent Claim
108 words
A method for the manufacture of a surgical article manufactured from a synthetic absorbable copolymer formed by copolymerizing glycolide with 1,3-dioxan-2-one wherein a combination of the monomers is substantially completely polymerized before the addition of the other monomer, the improvement comprising substantially completely polymerizing the combination in the presence of a difunctional initiator at about 180° C.; increasing the temperature up to about the melting point of polyglycolide; and adding glycolide to form a triblock copolymer comprising a proportion of units having the formula: ##STR15## as the end blocks, and the formula (I) randomly combined with a proportion of units having the formula: ##STR16## as the middle block.
Claim 5
Dependent Claim
20 words
A method of claim 2 wherein the initiator is selected from the group consisting of a glycol or a polyol.
Claim 6
Dependent Claim
11 words
A method of claim 3 wherein the initiator is a glycol.
Claim 7
Dependent Claim
11 words
A method of claim 4 wherein said glycol is diethylene glycol.
Claim 8
Dependent Claim
24 words
A method of claim 2 or 4 wherein the polymerizing of said combination is at a temperature of about 160° C. to 190° C.
Claim 9
Dependent Claim
12 words
A method of claim 6 wherein said temperature is about 180° C.
Claim 10
Dependent Claim
17 words
A method of claim 2 or 7 wherein said middle block is about 20-60 percent by weight.
Claim 11
Dependent Claim
33 words
A method of claim 8 wherein the middle block comprises 70-95 percent, by weight, of units of formula II and the total copolymer comprises 30-40 percent, by weight, of units of formula II.
Claim 12
Dependent Claim
16 words
A surgical article manufactured from copolymer made according to a method of claim 2 or 9.
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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) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |