US4842576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for generating substantially constant fluid pressure
Assignee: Baxter International Inc
•
Filing: 1986-10-15
•
Granted: 1989-06-27
•
Expires: 2006-10-15
Abstract
Abstract A system for generating substantially constant fluid pressure is provided for forcing fluid from a variable volume container. The system includes a roller that rotates in response to a constant applied torque to force fluid from the flexible container under a substantially constant pressure. Two spaced apart parallel rollers can exert force on both sides of the container.
Inventors
- 👤 Michael J. Lysaght
- 👤 Daniel R. Boggs
- 👤 Philip L. Ritger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3672; A61M1/14; A61M1/30; A61M1/301; A61M1/302; A61M1/305; A61M1/306; A61M1/308; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/148; A61M2205/00; A61M2205/50
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
124 words
A fluid separation system comprising a variable volume container for accumulating a desired volume of fluid, means for separating the fluid into component parts, means for holding said variable volume container, including an element rotatably supported adjacent to said variable volume container, and means including a mass subject to the force of gravity for generating an essentially constant torque to press said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the accumulated fluid from said container into said separation means at a substantially constant pressure, said mass being coupled to said rotatably mounted element by an elastic tubing member to slow the rate of descent of said mass.
Claim 2
Dependent Claim
124 words
A fluid separation system comprising a variable volume container for accumulating a desired volume of fluid, means for separating the fluid into component parts, means for holding said variable volume container, including an element rotatably supported adjacent to said variable volume container, and means including a mass subject to the force of gravity for generating an essentially constant torque to press said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the accumulated fluid from said container into said separation means at a substantially constant pressure, said mass being coupled to said rotatably mounted element by an elastic tubing member to slow the rate of descent of said mass.
Claim 3
Dependent Claim
40 words
A system according to claim 1 wherein said rotating element includes first and second spaced-apart rotating members between which said variable volume container is compressed while being advanced in response to the rotation of said first and second rotating members.
Claim 4
Dependent Claim
134 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and means including a mass subject to the force of gravity for generating an essentially constant torque to press said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container into said separation means at a substantially constant pressure, said mass being coupled to said rotatably mounted element by an elastic tubing member to slow the rate of descent of said means.
Claim 5
Dependent Claim
134 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and means including a mass subject to the force of gravity for generating an essentially constant torque to press said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container into said separation means at a substantially constant pressure, said mass being coupled to said rotatably mounted element by an elastic tubing member to slow the rate of descent of said means.
Claim 6
Dependent Claim
130 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container into said separation means, and means for collecting at least one of the component parts from said separation means while returning at least one of the component parts to the donor in response only to the force applied by said pressing and rotating means.
Claim 7
Dependent Claim
130 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container into said separation means, and means for collecting at least one of the component parts from said separation means while returning at least one of the component parts to the donor in response only to the force applied by said pressing and rotating means.
Claim 8
Dependent Claim
34 words
A blood component separation system according to claim 4; wherein said pressing and rotating means includes means for expressing the whole blood from said container into said separation means at a substantially constant pressure.
Claim 9
Dependent Claim
39 words
A blood separation system according to claim 5; wherein said pressure and rotating means includes means for generating an essentially constant torque to express the whole blood from said container into said separation means at a substantially constant pressure.
Claim 10
Dependent Claim
18 words
A blood component separation system according to claim 4 or 5; wherein said separation means includes a filter.
Claim 11
Dependent Claim
38 words
A blood component separation system according to claim 4 wherein said rotating element includes first and second spaced-apart rollers between which said variable volume container is compressed while being advanced in response to the rotation of said rollers.
Claim 12
Dependent Claim
36 words
A blood component separation system according to claim 8 wherein said pressing and rotating means includes means for generating an essentially constant torque to said rollers to express the whole blood at a substantially constant pressure.
Claim 13
Dependent Claim
16 words
A blood component separation system according to claim 9 wherein said separation means includes a filter.
Claim 14
Dependent Claim
135 words
A fluid separation system comprising a variable volume container for accumulating a desired volume of fluid, means for separating the fluid into component parts, means for holding said variable volume container, including an element rotatably supported adjacent to said variable volume container, and spring means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the accumulated fluid from said container into said separation means, said spring means including a first region for applying a first force to express fluid from said container at a first pressure, and a second region for applying a second force having a magnitude different than said first force to express fluid from said container at a pressure different than said first pressure.
Claim 15
Dependent Claim
135 words
A fluid separation system comprising a variable volume container for accumulating a desired volume of fluid, means for separating the fluid into component parts, means for holding said variable volume container, including an element rotatably supported adjacent to said variable volume container, and spring means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the accumulated fluid from said container into said separation means, said spring means including a first region for applying a first force to express fluid from said container at a first pressure, and a second region for applying a second force having a magnitude different than said first force to express fluid from said container at a pressure different than said first pressure.
Claim 16
Dependent Claim
40 words
A system according to claim 11 wherein said rotating element includes first and second spaced-apart rotating members between which said variable volume container is compressed while being advanced in response to the rotation of said first and second rotating members.
Claim 17
Dependent Claim
147 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and spring means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container into said separation means, said spring means including a first region for applying a first force to express whole blood from said container at a first pressure and a second region for applying a second force having a magnitude different than said first force to express whole blood from said container at a pressure different than said first pressure.
Claim 18
Dependent Claim
147 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and spring means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container into said separation means, said spring means including a first region for applying a first force to express whole blood from said container at a first pressure and a second region for applying a second force having a magnitude different than said first force to express whole blood from said container at a pressure different than said first pressure.
Claim 19
Independent Claim
110 words
A system for forcing fluid from a variable volume container at a substantially constant pressure comprising, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and means including a mass subjected to the force of gravity for pressing said element against the variable volume container to reduce its volume while generating an essentially constant torque to rotate said element to advance the container by said element and sequentially express fluid from the container at a substantially constant pressure, said mass being coupled to said rotatably mounted element by an elastic tubing member to slow the rate of descent of said mass.
Claim 20
Independent Claim
110 words
A system for forcing fluid from a variable volume container at a substantially constant pressure comprising, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and means including a mass subjected to the force of gravity for pressing said element against the variable volume container to reduce its volume while generating an essentially constant torque to rotate said element to advance the container by said element and sequentially express fluid from the container at a substantially constant pressure, said mass being coupled to said rotatably mounted element by an elastic tubing member to slow the rate of descent of said mass.
Claim 21
Dependent Claim
40 words
A system according to claim 14 wherein said rotating element includes first and second spaced-apart rotating members between which said variable volume container is compressed while being advanced in response to the rotation of said first and second rotative members.
Claim 22
Dependent Claim
153 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, conduit means for conveying the whole blood from said variable volume container to said separation means, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container through said conduit means into said separation means, said pressure and rotating means includes means for generating an essentially constant torque to express the whole blood from said container into said separation means at a pressure which remains substantially constant despite variations in fluid resistance occurring in said conduit means.
Claim 23
Dependent Claim
153 words
A blood component system comprising a variable volume container, means for accumulating a desired volume of whole blood from a donor in said variable volume container, means for separating whole blood into component parts, conduit means for conveying the whole blood from said variable volume container to said separation means, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and means for pressing said element against said variable volume container to reduce its volume while rotating said element to advance said container by said element and sequentially express the whole blood from said container through said conduit means into said separation means, said pressure and rotating means includes means for generating an essentially constant torque to express the whole blood from said container into said separation means at a pressure which remains substantially constant despite variations in fluid resistance occurring in said conduit means.
Claim 24
Dependent Claim
38 words
A blood component separation system according to claim 16 wherein said rotating element includes first and second spaced-apart rollers between which said variable volume container is compressed while being advanced in response to the rotation of said rollers.
Claim 25
Dependent Claim
16 words
A blood component separation system according to claim 16 wherein said separation means includes a filter.
Claim 26
Dependent Claim
38 words
A blood component separation system according to claim 16 wherein said rotating element includes first and second spaced-apart rollers between which said variable volume container is compressed while being advanced in response to the rotation of said rollers.
Claim 27
Dependent Claim
16 words
A blood component separation system according to claim 19 wherein said separation means includes a filter.
Claim 28
Independent Claim
134 words
A system for forcing fluid from a variable volume container at a substantially constant pressure comprising, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and spring means for pressing said element against the variable volume container to reduce its volume while generating torque to rotate said element to advance the container by said element and sequentially express fluid from the container, said spring means including a first region for generating a first essentially constant torque to rotate said element and express fluid from the container at a first substantially constant pressure and a second region for generating a second torque different than the first torque to rotate said element and express fluid from the container at a second pressure different than the first pressure.
Claim 29
Independent Claim
134 words
A system for forcing fluid from a variable volume container at a substantially constant pressure comprising, means for holding said variable volume container including an element rotatably supported adjacent to said variable volume container, and spring means for pressing said element against the variable volume container to reduce its volume while generating torque to rotate said element to advance the container by said element and sequentially express fluid from the container, said spring means including a first region for generating a first essentially constant torque to rotate said element and express fluid from the container at a first substantially constant pressure and a second region for generating a second torque different than the first torque to rotate said element and express fluid from the container at a second pressure different than the first pressure.
Claim 30
Dependent Claim
40 words
A system according to claim 21 wherein said rotating element includes first and second spaced-apart rotating members between which said variable volume container is compressed while being advanced in response to the rotation of said first and second rotative members.
References Cited (Backward Citations)
US32089A
Cited
US2502081A
Cited
US3151616A
Cited
US3198385A
Cited
US3655123A
Cited
US3543966A
Cited
US3647117A
Cited
US3670926A
Cited
USRE32089E
Cited
US3895741A
Cited
US4044764A
Cited
US4027784A
Cited
US4284502A
Cited
US4191182A
Cited
US4212742A
Cited
US4237881A
Cited
US4526515A
Cited
US4381775A
Cited
US4430078A
Cited
US4447191A
Cited
US4458539A
Cited
US4481827A
Cited
US4551139A
Cited
GB2118634A
Cited
US4557728A
Cited
US4493693A
Cited
US4588407A
Cited
US4479762A
Cited
US4479761A
Cited
US4479760A
Cited
NL8400114A
Cited
EP0114698A1
Cited
US4551136A
Cited
US4498983A
Cited
US4605503A
Cited
US4614513A
Cited
EP0175618A1
Cited
US4573962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |