US4037984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping apparatus and process characterized by gentle operation
Assignee: Bio Medicus Inc
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Filing: 1976-03-15
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Granted: 1977-07-26
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Expires: 1996-03-15
Abstract
Abstract Pumps wherein smooth surfaced rotators cause propulsion of a delicate fluid without significant damage to the fluid. The pumps may be used as heart pumps, blood pumps, and pumps for all types of fluids in connection with the maintenance of life or biological functions in a human or animal subject in many in vivo, ex vivo, or in vitro applications, or for any other application requiring gentle fluid handling. The pumps may be actuated by internal or external electric motors, and the rotators may be configured to converge mutually as an inverse function of distance from the axis of the rotators. The rotators may be connected together, by pins passing through the fluid passages, for mounting and driving as a unit, or may be mounted and driven independently to further eliminate the possibility of damage to the fluid by rotator-connection members.
Inventors
- 👤 Edson Howard Rafferty
- 👤 Harold D. Kletschka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:31
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; A; A61; A61M; A61M60/00; A61M60/10; A61M60/104; A61M60/109; A61M60/113; A61M60/122; A61M60/20; A61M60/205; A61M60/216; A61M60/30; A61M60/36; A61M60/37; A61M60/38; A61M60/40; A61M60/403; A61M60/408; A61M60/411; A61M60/416; A61M60/50; A61M60/508; A61M60/538; A61M60/80; A61M60/802; A61M60/818; A61M60/82; A61M60/824; A61M60/825; A61M60/827; A61M60/855; A61M60/871; A61M60/876; F04D5/00; F04D5/001; A61M60/126; A61M60/148; A61M60/422; F05; F05B; F05B2200/00; F05B2200/10; F05B2200/15
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
Apparatus for pumping biological fluids without causing significant damage thereto, comprising, in combination: 1. means dividing the fluid to be pumped into a plurality of independent streams; 2. means for accelerating the several streams by superficial contact with smooth accelerator members, including a. a plurality of nested, coaxial rotators arranged to define walls of a plurality of pumping passages extending along the common axis and increasing in mean diameter with distance along the axis, b. means separately mounting said rotators for rotation about said axis, c. means supplying said streams to said passages at the smaller diameter ends thereof, d. means driving said rotators independently at predetermined angular velocities which may be the same; and 3. means combining the outputs of the several passages to comprise the principal output of the apparatus.
Claim 2
Dependent Claim
132 words
Apparatus for pumping biological fluids without causing significant damage thereto, comprising, in combination: 1. means dividing the fluid to be pumped into a plurality of independent streams; 2. means for accelerating the several streams by superficial contact with smooth accelerator members, including a. a plurality of nested, coaxial rotators arranged to define walls of a plurality of pumping passages extending along the common axis and increasing in mean diameter with distance along the axis, b. means separately mounting said rotators for rotation about said axis, c. means supplying said streams to said passages at the smaller diameter ends thereof, d. means driving said rotators independently at predetermined angular velocities which may be the same; and 3. means combining the outputs of the several passages to comprise the principal output of the apparatus.
Claim 3
Dependent Claim
94 words
In apparatus for pumping delicate fluids without causing damage thereto and comprising a plurality of nesting, coaxial rotators, arranged to define moving walls of a plurality of pumping passages extending along the common axis and increasing in mean diameter with distance along the axis, for accelerating fluid in said passages by superficial contact with smooth surfaces of said rotators, the improvement which comprises: 1. means independently mounting said rotators for rotation about said axis; and 2. individual motor means connected to drive said rotators independently at predetermined angular velocities which may be the same.
Claim 4
Dependent Claim
94 words
In apparatus for pumping delicate fluids without causing damage thereto and comprising a plurality of nesting, coaxial rotators, arranged to define moving walls of a plurality of pumping passages extending along the common axis and increasing in mean diameter with distance along the axis, for accelerating fluid in said passages by superficial contact with smooth surfaces of said rotators, the improvement which comprises: 1. means independently mounting said rotators for rotation about said axis; and 2. individual motor means connected to drive said rotators independently at predetermined angular velocities which may be the same.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 2 in which the rotators are mounted and driven at their smaller diameter ends.
Claim 6
Dependent Claim
27 words
Apparatus according to claim 2 in which at least one of said rotators comprises the outer wall of one passage and the inner wall of another passage.
Claim 7
Dependent Claim
19 words
Apparatus according to claim 2 in which one of said rotators is mounted and driven at its larger end.
Claim 8
Dependent Claim
22 words
Apparatus according to claim 2 in which the passages are of different axial lengths and of substantially the same maximum mean diameter.
Claim 9
Dependent Claim
19 words
Apparatus according to claim 6 in which fluid is separately supplied to the passages at the small ends thereof.
Claim 10
Dependent Claim
31 words
Apparatus according to claim 1 in which said rotators are so configured that at least one of said passages remains substantially constant in cross sectional area with distance along the axis.
Claim 11
Dependent Claim
29 words
Apparatus according to claim 1 in which each of said motor means comprises a rotor carried by one of said rotators and a stator winding fixed with respect thereto.
Claim 12
Dependent Claim
27 words
Apparatus according to claim 1 in which one of the mounting means includes solely magnetic means for maintaining a rotator in a predetermined axial and radial position.
Claim 13
Dependent Claim
105 words
Apparatus for pumping material without causing significant damage thereto comprising, in combination: 1. a plurality of nested, coaxial rotators arranged to define walls of a plurality of pumping passages, free from transverse members, extending along the common axis and increasing in mean diameter with distance along the axis; 2. means separately mounting said rotators for rotation about said axis; 3. means supplying said material to said passages at the smaller diameter ends thereof; 4. means driving said rotators independently at predetermined angular velocities, which may be the same; and 5. means combining the outputs of said passages to comprise the pumping output of the apparatus.
Claim 14
Dependent Claim
105 words
Apparatus for pumping material without causing significant damage thereto comprising, in combination: 1. a plurality of nested, coaxial rotators arranged to define walls of a plurality of pumping passages, free from transverse members, extending along the common axis and increasing in mean diameter with distance along the axis; 2. means separately mounting said rotators for rotation about said axis; 3. means supplying said material to said passages at the smaller diameter ends thereof; 4. means driving said rotators independently at predetermined angular velocities, which may be the same; and 5. means combining the outputs of said passages to comprise the pumping output of the apparatus.
References Cited (Backward Citations)
GB331142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |