Patent US3892236A successfully refreshed from Google Patents.
US3892236A
Expired / Lapsed
US
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Apparatus for filtration-leukopheresis for separation and concentration of human granulocytes
Assignee: Individual
•
Filing: 1973-04-02
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Granted: 1975-07-01
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Expires: 1993-04-02
Abstract
Abstract Apparatus of simple character is provided for continuous withdrawal of blood from a human donor, forced extracorporeal circulation of blood of the donor with separation of granulocytes, and return by gravity of the leukocyte-poor whole blood to the donor.
Inventors
- 👤 Isaac Djerassi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/34; A61M1/3496; A61M1/36; A61M1/3621; A61M1/60; A61M1/62; A61M2202/00; A61M2202/04; A61M2202/0413; A61M2202/0439; A61M2202/0441
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
Apparatus for filtration-leukopheresis comprising a venous blood supply connection adapted to be connected to a donor, a venous blood return connection adapted to be connected to the donor, a leukocyte separating and retaining filter interposed in series with said connections and in fluid communication therewith for extracting leukocytes from blood passing therethrough, a permanently vented receptacle in continuous communication with the atmosphere interposed in series between said filter and said return connection and in fluid communication therewith, fixedly mounted detachable supporting members for said filter and said vented receptacle, and power driven pump means upstream of said receptacle for continuously delivering blood from said supply connection to and through said filter and to said vented receptacle.
Claim 2
Dependent Claim
116 words
Apparatus for filtration-leukopheresis comprising a venous blood supply connection adapted to be connected to a donor, a venous blood return connection adapted to be connected to the donor, a leukocyte separating and retaining filter interposed in series with said connections and in fluid communication therewith for extracting leukocytes from blood passing therethrough, a permanently vented receptacle in continuous communication with the atmosphere interposed in series between said filter and said return connection and in fluid communication therewith, fixedly mounted detachable supporting members for said filter and said vented receptacle, and power driven pump means upstream of said receptacle for continuously delivering blood from said supply connection to and through said filter and to said vented receptacle.
Claim 3
Dependent Claim
23 words
The combination defined in claim 1 in which said last mentioned means includes members for impelling said blood under constant positive air pressure.
Claim 4
Dependent Claim
39 words
The combination defined in claim 1 in which said last mentioned means includes a plurality of flexible receptacles for alternate receipt and delivery of blood from the donor, and pressure and vacuum applying means for activating said flexible receptacles.
Claim 5
Dependent Claim
19 words
The combination defined in claim 1 in which said last mentioned means includes a constant volume continuous impelling menber.
Claim 6
Dependent Claim
16 words
The combination defined in claim 4 in which said impelling member is a constant volume pump.
Claim 7
Dependent Claim
15 words
The combination defined in claim 5 in which said pump has a counter actuated thereby.
Claim 8
Dependent Claim
32 words
The combination defined in claim 1 in which said filter and said receptacle are interconnected and have supply and delivery connections to provide a replaceable unit for individual use by a donor.
Claim 9
Dependent Claim
23 words
A replaceable unit as defined in claim 7 in which said supply pipe has a plurality of flexible blood receiving receptacles interposed therein.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |