US4490326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding process for polydioxanone polymers
Assignee: Ethicon Inc
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Filing: 1982-10-06
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Granted: 1984-12-25
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Expires: 2002-10-06
Abstract
Abstract A process for molding surgical clips having improved in vivo performance characteristics from polymers of p-dioxanone. The polymers are heated to a temperature above their melt temperature and the molten polymer injected into a mold maintained at a temperature of 35° C. or less.
Inventors
- 👤 Howard Beroff
- 👤 Darrell R. Thompson
- 👤 Robert W. Mericle
- 👤 William C. Travis, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:22
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/0001; A; A61; A61B; A61B17/00; A61B17/12; A61B17/122; A61L; A61L31/00; A61L31/04; A61L31/06; A61B17/064; A61B17/0643
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
A method of producing a molded surgical device from polymers having units of the formula: ##STR3## wherein x is the degree of polymerization resulting in a high molecular weight moldable polymer, said polymer having an inherent viscosity of at least 0.50 measured as a 0.1% solution in tetrachloroethane at 25° C. and a crystallinity of at least 20% as determined by X-ray diffraction comprising: (a) heating the polymer to a temperature of from about the melt temperature of the polymer to about 140° C.: (b) injecting said heated polymer in a mold, said mold being maintained at a temperature of 35° C. or less; (c) allowing said polymer to harden sufficient to maintain its shape while in the mold; and (d) removing said hardened polymer from the mold.
Claim 2
Independent Claim
128 words
A method of producing a molded surgical device from polymers having units of the formula: ##STR3## wherein x is the degree of polymerization resulting in a high molecular weight moldable polymer, said polymer having an inherent viscosity of at least 0.50 measured as a 0.1% solution in tetrachloroethane at 25° C. and a crystallinity of at least 20% as determined by X-ray diffraction comprising: (a) heating the polymer to a temperature of from about the melt temperature of the polymer to about 140° C.: (b) injecting said heated polymer in a mold, said mold being maintained at a temperature of 35° C. or less; (c) allowing said polymer to harden sufficient to maintain its shape while in the mold; and (d) removing said hardened polymer from the mold.
Claim 3
Dependent Claim
24 words
The method according to claim 1 wherein pressure is maintained on the polymer in the mold as the polymer starts to harden and crystallize.
Claim 4
Dependent Claim
21 words
The method according to claim 1 or 2 wherein the mold temperature is maintained at from 20° C. to 30° C.
Claim 5
Dependent Claim
17 words
The method according to claim 3 wherein the polymer is heated to 110° C. to 115° C.
Claim 6
Dependent Claim
28 words
The method according to claim 2 wherein the pressure maintained on the polymer while it is hardening is from about 150 to about 650 pounds per square inch.
Claim 7
Dependent Claim
30 words
The method according to claim 2 or 5 wherein the polymer is injected into the mold at a pressure of from about 500 to about 1300 pounds per square inch.
Claim 8
Dependent Claim
24 words
The method according to claim 6 wherein at least 50% of the injection pressure is maintained on the polymer while the polymer is hardening.
Claim 9
Independent Claim
167 words
A method for producing a molded ligating clip from a polymer of p-dioxanone, said polymer having an inherent viscosity of at least 0.50 measured as a 0.1% solution in tetrachloroethane at 25° C. and a crystallinity of at least about 20% determined by X-ray diffraction, said clip comprising a pair of leg members connected at their proximal ends by a resilient hinge area and including latching means at the distal ends of said leg members, comprising: (a) heating the polymer to a temperature of from about the melt temperature of the polymer to 140° C.; (b) injecting said heated polymer under pressure into a mold having the configuration of said ligating clip, said mold being maintained at a temperature of 35° C. or less; (c) maintaining pressure on said polymer as the polymer starts to harden and crystallize in the mold; (d) allowing the polymer to harden while in the mold; and (e) removing said hardened polymer from the mold in the configuration of said ligating clip.
Claim 10
Independent Claim
167 words
A method for producing a molded ligating clip from a polymer of p-dioxanone, said polymer having an inherent viscosity of at least 0.50 measured as a 0.1% solution in tetrachloroethane at 25° C. and a crystallinity of at least about 20% determined by X-ray diffraction, said clip comprising a pair of leg members connected at their proximal ends by a resilient hinge area and including latching means at the distal ends of said leg members, comprising: (a) heating the polymer to a temperature of from about the melt temperature of the polymer to 140° C.; (b) injecting said heated polymer under pressure into a mold having the configuration of said ligating clip, said mold being maintained at a temperature of 35° C. or less; (c) maintaining pressure on said polymer as the polymer starts to harden and crystallize in the mold; (d) allowing the polymer to harden while in the mold; and (e) removing said hardened polymer from the mold in the configuration of said ligating clip.
Claim 11
Dependent Claim
19 words
The method according to claim 8 wherein the mold temperature is maintained at from 20° C. to 30° C.
Claim 12
Dependent Claim
19 words
The method according to claim 8 or 9 wherein the polymer is heated to 110° C. to 115° C.
Claim 13
Dependent Claim
28 words
The method according to claim 8 or 9 wherein at least 50% of the injection pressure is maintained on the polymer as it starts to harden and crystallize.
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |