Patent US4472226A successfully refreshed from Google Patents.
US4472226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone gel filled prosthesis
Assignee: McGhan Medical Corp
•
Filing: 1982-03-18
•
Granted: 1984-09-18
•
Expires: 2002-03-18
Abstract
Abstract A prosthesis for subcutaneous implantation in a patient comprising a flexible sac and a silicone gel contained within the sac. The wall of the sac is comprised of at least one continuous layer of silicone elastomer which substantially impedes the migration of said silicone gel from the sac.
Inventors
- 👤 Peter V. A. Redinger
- 👤 Richard A. Compton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:38
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/12; B; B29; B29C; B29C41/00; B29C41/02; B29C41/14; B29C2791/00; B29C2791/001; B29L; B29L2031/00; B29L2031/753; B29L2031/7532
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A method for forming a prosthesis for subcutaneous implantation comprising: (a) forming a sac of silicone elastomer having an interior and an exterior surface; (b) coating at least one surface of said sac with a silicone elastomer which when cured has a thickness of at least 0.025 mm and has a change in weight of less than 10% when tested in accordance with ASTM D471 utilizing a dimethylpolysiloxane test gel having a 300 centistoke viscosity; and (c) filling said sac with silicone gel.
Claim 2
Independent Claim
83 words
A method for forming a prosthesis for subcutaneous implantation comprising: (a) forming a sac of silicone elastomer having an interior and an exterior surface; (b) coating at least one surface of said sac with a silicone elastomer which when cured has a thickness of at least 0.025 mm and has a change in weight of less than 10% when tested in accordance with ASTM D471 utilizing a dimethylpolysiloxane test gel having a 300 centistoke viscosity; and (c) filling said sac with silicone gel.
Claim 3
Dependent Claim
46 words
The method of claim 1 wherein step (b) comprises placing silicone elastomer into the said interior surface of said sac as a dispersion of said coating silicone elastomer in solvent, substantially uniformally applying the dispersion to the interior surface of the sac and evaporating said solvent.
Claim 4
Independent Claim
160 words
A method for forming a prosthesis for subcutaneous implantation comprising: (a) dipping a mandrel which is shaped to the desired form into a dispersion of unvulcanized silicone elastomer in a solvent; (b) evaporating the solvent from said unvulcanized silicone elastomer; (c) dipping said mandrel having the evaporated silicone dispersion thereon into a dispersion of unvulcanized silicone elastomer which when cured has a change in weight of less than 10% when tested in accordance with ASTM D471 utilizing a dimethylpolysiloxane gel having a 300 centistoke viscosity; (d) evaporating the solvent from said unvulcanized silicone elastomer; (e) repeating steps a and b to obtain a cured elastomer thickness of between about 0.05 mm and about 0.2 mm; (f) curing the formed silicone elastomer shell on said mandrel; (g) removing said vulcanized silicone elastomer shell from said mandrel; (h) sealing said formed vulcanized silicone elastomer shell to form a sac; (i) filling said sealed sac with silicone gel; and (j) curing said gel.
Claim 5
Independent Claim
160 words
A method for forming a prosthesis for subcutaneous implantation comprising: (a) dipping a mandrel which is shaped to the desired form into a dispersion of unvulcanized silicone elastomer in a solvent; (b) evaporating the solvent from said unvulcanized silicone elastomer; (c) dipping said mandrel having the evaporated silicone dispersion thereon into a dispersion of unvulcanized silicone elastomer which when cured has a change in weight of less than 10% when tested in accordance with ASTM D471 utilizing a dimethylpolysiloxane gel having a 300 centistoke viscosity; (d) evaporating the solvent from said unvulcanized silicone elastomer; (e) repeating steps a and b to obtain a cured elastomer thickness of between about 0.05 mm and about 0.2 mm; (f) curing the formed silicone elastomer shell on said mandrel; (g) removing said vulcanized silicone elastomer shell from said mandrel; (h) sealing said formed vulcanized silicone elastomer shell to form a sac; (i) filling said sealed sac with silicone gel; and (j) curing said gel.
References Cited (Backward Citations)
US3179619A
Cited
CA774531A
Cited
US1713751A
Cited
US2842775A
Cited
US3020260A
Cited
US3189921A
Cited
US3293663A
Cited
US3434869A
Cited
US3416160A
Cited
US3366975A
Cited
US3683424A
Cited
US3701753A
Cited
US3775452A
Cited
US3916033A
Cited
US4072635A
Cited
US3801544A
Cited
US3883902A
Cited
US3779987A
Cited
US3845507A
Cited
US3819772A
Cited
US3884866A
Cited
US3957713A
Cited
US3911503A
Cited
US3902198A
Cited
US3919724A
Cited
US3934274A
Cited
US3986213A
Cited
US4029629A
Cited
US4086666A
Cited
US4100627A
Cited
US4095295A
Cited
US4138382A
Cited
US4303595A
Cited
EP0030838A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |