US3841799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical cassette pump
Assignee: EAST WEST MED PROD
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Filing: 1973-01-17
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Granted: 1974-10-15
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Expires: 1993-01-17
Abstract
Abstract A medical cassette pump wherein a drive motor continuously rotates a fluid drive assembly about a principal axis, said fluid drive assembly including a plurality of rollers mounted for free rotation about respective roller axes spaced from said principal axis, said fluid drive assembly carrying said rollers about said principal axis during the rotation thereof. Displaceable cassette means is provided for releasably engaging a fluid carrying tube against said rollers for the advancement of fluid along said tube in response to the rotation of said fluid drive assembly.
Inventors
- 👤 D Spinosa
- 👤 J Varga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:52
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/1253; A; A61; A61M; A61M5/00; A61M5/14; A61M5/142
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
202 words
A medical cassette pump comprising drive means; a fluid drive assembly operatively coupled to said drive means for rotation thereby about a principal axis, said fluid drive assembly including at least two planetray rollers freely rotatably mounted in space relation to said principal axis and to each other, said planetary rollers being formed with a cylindrical portion and a conical portion extending from one end of said cylindrical portion; a fluid carrying tube; and displaceable cassette means for releasably engaging said fluid carrying tube against the cylindrical portion of at least one of said planetary rollers for the displacement of said fluid therealong, said cassette means being formed with a central opening therein dimensioned to receive said fluid drive assembly, a portion of the inner periphery of said central opening Being defined by a channel facing said principal axis dimensioned to receive said fluid carrying tube with portions thereof extending laterally from said channel for the gradual riding on and compression of said fluid carrying tube by the conical portion of at least one of said planetary rollers as said cassette means is displaced along said principal axis until said channel is in registration with said cylindrical portion of said planetray rollers.
Claim 2
Dependent Claim
202 words
A medical cassette pump comprising drive means; a fluid drive assembly operatively coupled to said drive means for rotation thereby about a principal axis, said fluid drive assembly including at least two planetray rollers freely rotatably mounted in space relation to said principal axis and to each other, said planetary rollers being formed with a cylindrical portion and a conical portion extending from one end of said cylindrical portion; a fluid carrying tube; and displaceable cassette means for releasably engaging said fluid carrying tube against the cylindrical portion of at least one of said planetary rollers for the displacement of said fluid therealong, said cassette means being formed with a central opening therein dimensioned to receive said fluid drive assembly, a portion of the inner periphery of said central opening Being defined by a channel facing said principal axis dimensioned to receive said fluid carrying tube with portions thereof extending laterally from said channel for the gradual riding on and compression of said fluid carrying tube by the conical portion of at least one of said planetary rollers as said cassette means is displaced along said principal axis until said channel is in registration with said cylindrical portion of said planetray rollers.
Claim 3
Dependent Claim
47 words
A medical cassette pump as recited in claim 1, wherein said cassette includes an annular body having said central opening and channel therein, said body being formed with a pair of spaced bores therethrough providing communication to said channel and dimensioned to receive said fluid carrying tube.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |