Patent US4550449A successfully refreshed from Google Patents.
US4550449A
Expired / Lapsed
US
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Absorbable bone fixation device
Assignee: Johnson and Johnson Professional Inc
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Filing: 1984-11-05
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Granted: 1985-11-05
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Expires: 2004-11-05
Abstract
Abstract An absorbable internal bone fixation device is disclosed. The device is made from a high molecular weight polymer of L(-)lactide having an inherent viscosity above 4.5. The polymer contains less than 2% unreacted monomer and is polymerized under conditions of selected monomer to catalyst ratios and temperature.
Inventors
- 👤 Deger C. Tunc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:30
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; A; A61; A61L; A61L31/00; A61L31/04; A61L31/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A resorbable bone fixation device capable of maintaining a tensile strength of at least 100 kilograms per square centimeter for 8 weeks after implantation in an animal body made from a poly L(-)lactide polymer having an inherent viscosity as a 1 percent solution in chloroform at 25° C. of from 4.5 to 10 and containing less than 2% of unreacted lactide monomer.
Claim 2
Dependent Claim
62 words
A resorbable bone fixation device capable of maintaining a tensile strength of at least 100 kilograms per square centimeter for 8 weeks after implantation in an animal body made from a poly L(-)lactide polymer having an inherent viscosity as a 1 percent solution in chloroform at 25° C. of from 4.5 to 10 and containing less than 2% of unreacted lactide monomer.
Claim 3
Dependent Claim
37 words
The bone fixation device of claim 1 in which the inherent viscosity of the polymer is from 7.0 to 10.0 and which has a tensile strength prior to implantation of at least 500 kilograms per square centimeter.
Claim 4
Dependent Claim
18 words
The bone fixation device of claim 1 in which the polymer contains less than 1% unreacted lactide monomer.
References Cited (Backward Citations)
DE14548C
Cited
FR11528E
Cited
US2703316A
Cited
FR1254015A
Cited
FR1425333A
Cited
US3773919A
Cited
US3982543A
Cited
US4141087A
Cited
US4279249A
Cited
US4265247A
Cited
US4379138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |