Patent US4772284A successfully refreshed from Google Patents.
US4772284A
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Breast prosthesis with improved biocompatibility and method of making the same
Assignee: Isotis Orthobiologics Inc
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Filing: 1986-03-27
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Granted: 1988-09-20
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Expires: 2006-03-27
Abstract
Abstract A single lumen implantable and biocompatible breast prosthesis composed of an outer membrane of silastic, medical grade silicone, and an inner filling material selected from the group consisting of purified reconstituted collagen gel and a purified gel of poly-alpha amino acid homopolymers or random copolymers having a molecular weight of from 5,000 to 400,000. The purified reconstituted collagen gel has a collagen concentration of from 20 to 100 milligrams per milliliter of gel.
Inventors
- 👤 Steven R. Jefferies
- 👤 Robert J. Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:14
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/22; A61L27/24; A61F; A61F2/00; A61F2/02; A61F2/12; A61L27/18; A61L27/50; A61L27/52; A61F2310/00; A61F2310/00005; A61F2310/00365; Y; Y10; Y10S; Y10S128/00; Y10S128/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
A single lumen biocompatible implantable breast prosthesis composed of an outer membrane of silastic, medical-grade silicone, and an inner filling material selected from the group consisting of (a) purified, reconstituted collagen gel, wherein said collagen has a concentration of from 20 to 100 milligrams per millimeter of gel, and (b) a purified gel of poly-alpha amino acid homopolymers or random copolymers having a molecular weight of from 5,000 to 400,000 whereby the outer membrane, when filled with the inner filling material takes on the configuration of a natural human female breast.
Claim 2
Dependent Claim
91 words
A single lumen biocompatible implantable breast prosthesis composed of an outer membrane of silastic, medical-grade silicone, and an inner filling material selected from the group consisting of (a) purified, reconstituted collagen gel, wherein said collagen has a concentration of from 20 to 100 milligrams per millimeter of gel, and (b) a purified gel of poly-alpha amino acid homopolymers or random copolymers having a molecular weight of from 5,000 to 400,000 whereby the outer membrane, when filled with the inner filling material takes on the configuration of a natural human female breast.
Claim 3
Dependent Claim
26 words
The prosthesis of claim 1, wherein said collagen gel is crosslinked with glutaraldehyde or hemamethylene diisocyanate at a concentration of from 0.005% to 5% by volume.
Claim 4
Dependent Claim
17 words
The prosthesis of claim 1, wherein the gel in (b) is crosslined with a chemical crosslinking agent.
References Cited (Backward Citations)
US4597762A
Cited
US4648880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |