US4892544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for forming hollow, porous-surfaced elastomeric bodies
Assignee: Dow Silicones Corp
•
Filing: 1988-03-07
•
Granted: 1990-01-09
•
Expires: 2008-03-07
Abstract
Abstract A method of forming hollow, porous elastomeric bodies and hollow, duo-layered elastomeric bodies wherein one layer is porous and contiguous with the other layer which is solid by (a) coating a surface of a mandrel with a coating liquid, (b) adhering a layer of water-elutable particles onto the coated mandrel surface, (c) applying a layer of fluid elastomer composition to the particle-coated mandrel surface wherein the elastomeric composition is capable of forming a water-insoluble elastomer, (d) causing said elastomeric composition to form a cohesive mass while in contact with the particle-coated mandrel surface, (e) dissolving said elutable particles from the cohesvie mass with a water-based solvent, and (f) removing the cohesive mass from the mandrel. The coating liquid comprises water and may also further comprise a wetting agent and/or a sugar. The invention also relates to the method wherein the water-elutable particles are adhered to the mandrel surface by heating the mandrel surface. The method is useful for making prostheses, e.g., mammary prostheses and vascular prostheses.
Inventors
- 👤 Eldon E. Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:20
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; B; B29; B29C; B29C67/00; B29C67/20; B29C67/202; A61F2/12; A61J; A61J1/00; A61J1/05; A61J1/10; B29L; B29L2031/00; B29L2031/753; B29L2031/7532; C08J2383/00; C08J2383/04; Y; Y10; Y10S; Y10S623/00; Y10S623/901
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
117 words
A method of making a hollow elastomeric body having a porous surface layer comprising (a) coating at least a portion of a surface of a mandrel with a coating liquid selected from the group consisting of water, water-and-wetting agent solutions, and water-an-sugar solutions (b) adhering a layer of water-elutable particles onto the coated mandrel surface, (c) applying a layer of fluid elastomer composition to the particle-coated mandrel surface, said elastomeric composition capable of forming a water-insoluble elastomer, (d) causing said elastomeric composition to form a cohesive mass while in contact with said particle-coated mandrel surface, (e) dissolving said elutable particles from said cohesive mass with a water-based solvent, and (f) removing said cohesive mass from said mandrel.
Claim 2
Independent Claim
117 words
A method of making a hollow elastomeric body having a porous surface layer comprising (a) coating at least a portion of a surface of a mandrel with a coating liquid selected from the group consisting of water, water-and-wetting agent solutions, and water-an-sugar solutions (b) adhering a layer of water-elutable particles onto the coated mandrel surface, (c) applying a layer of fluid elastomer composition to the particle-coated mandrel surface, said elastomeric composition capable of forming a water-insoluble elastomer, (d) causing said elastomeric composition to form a cohesive mass while in contact with said particle-coated mandrel surface, (e) dissolving said elutable particles from said cohesive mass with a water-based solvent, and (f) removing said cohesive mass from said mandrel.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1 wherein dissolving step (e) is performed before removing step (f).
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1 wherein dissolving step (e) is performed both before and after removing step (f).
Claim 5
Dependent Claim
55 words
A method as claimed in claim 1 wherein in step (c) said fluid elastomer composition is applied to the entire surface of the mandrel except to an area which is smaller than the side of the mandrel on which said area is located, the method thereby forming a hollow elastomeric body having a constricted opening.
Claim 6
Dependent Claim
26 words
A method as claimed in claim 1 further comprising the step of heating said mandrel after the coating step (a) and before the adhering step (b).
Claim 7
Dependent Claim
17 words
A method as claimed in claim 1 wherein said coating liquid consists of a water-and-wetting agent solution.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 6 wherein said elastomeric composition is a silicone elastomer composition and the particles are selected from the group consisting of salt and sugar.
Claim 9
Dependent Claim
18 words
The method as claimed in claim 7 wherein the silicone elastomer composition is a dispersion in 1,1,1 trichloroethane.
Claim 10
Dependent Claim
11 words
A hollow elastomeric body formed by the method of claim 8.
Claim 11
Dependent Claim
16 words
A method as claimed in claim 1 wherein said coating liquid consists of a water-and-sugar solution.
Claim 12
Dependent Claim
28 words
A method as claimed in claim 10 wherein said elastomeric composition is silicone elastomer composition and the particles are selected from the group consisting of salt and sugar.
Claim 13
Dependent Claim
18 words
The method as claimed in claim 11 wherein the silicone elastomer composition is a dispersion in 1,1,1 trichloroethane.
Claim 14
Dependent Claim
11 words
A hollow elastomeric body formed by the method of claim 12.
Claim 15
Independent Claim
111 words
A method of making a hollow elastomeric body having a porous surface layer comprising (a) heating at least a portion of a surface of a mandrel to at least the melting temperature of water-elutable particles, (b) applying a layer of water-elutable particles onto the heated mandrel surface so that the particles adhere to the mandrel without melting completely, (c) applying a layer of fluid elastomer composition to the particle-coated mandrel surface, (d) causing said elastomeric composition to form a cohesive mass while in contact with said particle-coated mandrel surface, (e) dissolving said elutable particles from said cohesive mass with a water-based solvent, and (f) removing said cohesive mass from said mandrel.
Claim 16
Independent Claim
111 words
A method of making a hollow elastomeric body having a porous surface layer comprising (a) heating at least a portion of a surface of a mandrel to at least the melting temperature of water-elutable particles, (b) applying a layer of water-elutable particles onto the heated mandrel surface so that the particles adhere to the mandrel without melting completely, (c) applying a layer of fluid elastomer composition to the particle-coated mandrel surface, (d) causing said elastomeric composition to form a cohesive mass while in contact with said particle-coated mandrel surface, (e) dissolving said elutable particles from said cohesive mass with a water-based solvent, and (f) removing said cohesive mass from said mandrel.
Claim 17
Dependent Claim
17 words
A method as claimed in claim 14 wherein dissolving step (e) is performed before removing step (f).
Claim 18
Dependent Claim
20 words
A method as claimed in claim 14 wherein dissolving step (e) is performed both before and after removing step (f).
Claim 19
Dependent Claim
55 words
A method as claimed in claim 14 wherein in step (c) said fluid elastomer composition is applied to the entire surface of the mandrel except to an area which is smaller than the side of the mandrel on which said area is located, the method thereby forming a hollow elastomeric body having a constricted opening.
Claim 20
Dependent Claim
21 words
A method as claimed in claim 14 wherein said elastomeric composition is a silicone elastomer composition and the particles are sugar.
Claim 21
Dependent Claim
18 words
A method as claimed in claim 18 wherein the silicone elastomer composition is a dispersion in 1,1,1 trichloroethane.
Claim 22
Dependent Claim
11 words
A hollow elastomeric body formed by the method of claim 19.
References Cited (Backward Citations)
US2688139A
Cited
US2971221A
Cited
US3121762A
Cited
US3376238A
Cited
US3700380A
Cited
US4003973A
Cited
US3950467A
Cited
US3980613A
Cited
US3930979A
Cited
US3992725A
Cited
US4003818A
Cited
US4129470A
Cited
US4281669A
Cited
US4355426A
Cited
US4374669A
Cited
US4459252A
Cited
US4627836A
Cited
US4199864A
Cited
US4244689A
Cited
US4321230A
Cited
US4604762A
Cited
US4759757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |