US3969240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysiloxane membrane lung
Assignee: United States Department of Health and Human Services
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Filing: 1975-02-03
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Granted: 1976-07-13
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Expires: 1995-02-03
Abstract
Abstract A polydimethylsiloxane gum without silica filler is applied to silicone rubber membranes for use in a membrane lung.
Inventors
- 👤 Theodor Kolobow
- 👤 Fusakazu Hayano
- 👤 Paul Weathersby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:46
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D71/00; B01D71/06; B01D71/70; B01D71/701
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
In an artificial membrane lung having blood contacting surfaces, including a pair of spaced silicone rubber membranes formed of silica filled silicone, the improvement wherein said silica filled silicone rubber is coated with a polydimethylsiloxane gum having no silica filler.
Claim 2
Dependent Claim
40 words
In an artificial membrane lung having blood contacting surfaces, including a pair of spaced silicone rubber membranes formed of silica filled silicone, the improvement wherein said silica filled silicone rubber is coated with a polydimethylsiloxane gum having no silica filler.
Claim 3
Dependent Claim
21 words
The use of a polydimethylsiloxane gum having no silica filler in accordance with claim 1 as a coating for hypothrombogenic surfaces.
Claim 4
Dependent Claim
20 words
The use as recited in claim 2 wherein said hypothrombogenic surfaces are the blood contacting surfaces of a membrane lung.
Claim 5
Dependent Claim
45 words
A process comprising bringing into contact with blood a medical device made from a silica filled silicone rubber membrane coated with a blood contacting surface film consisting essentially of silicone elastomer and being free of silica filler, whereby said device functions with improved blood compatibility.
Claim 6
Dependent Claim
45 words
A process comprising bringing into contact with blood a medical device made from a silica filled silicone rubber membrane coated with a blood contacting surface film consisting essentially of silicone elastomer and being free of silica filler, whereby said device functions with improved blood compatibility.
Claim 7
Dependent Claim
16 words
A process in accordance with claim 4, wherein said blood contacting surface consists essentially of polydimethylsiloxane.
Claim 8
Dependent Claim
54 words
In a process comprising passing a body fluid containing a biologically active material through an artificial member, the improvement comprising: improving thromboresistance of said artificial member to the body fluid by using as such member a substrate coated with a silicone elastomer film having no silica filler, said film serving as a hypothrombogenic surface.
Claim 9
Dependent Claim
54 words
In a process comprising passing a body fluid containing a biologically active material through an artificial member, the improvement comprising: improving thromboresistance of said artificial member to the body fluid by using as such member a substrate coated with a silicone elastomer film having no silica filler, said film serving as a hypothrombogenic surface.
Claim 10
Dependent Claim
57 words
A process in accordance with claim 6 for adding to or removing from said body fluid said biologically active material by dialysis, and wherein said artificial member comprises an artificial membrane through which said dialysis occurs by passing the body fluid over one side of the membrane so that the biologically active material diffuses through the membrane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |