Patent US3768496A successfully refreshed from Google Patents.
US3768496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two phase blood pump
Assignee: NOVA MEDICAL Ltd
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Filing: 1972-04-27
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Granted: 1973-10-30
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Expires: 1992-04-27
Abstract
Abstract A method and apparatus for pumping blood wherein pump elements are provided and operated in a manner to avoid injury to blood constituents. Such apparatus operates with respect to a two-phase combination of blood and an inert liquid which is immiscible with blood, wherein successive slugs of blood are encapsulated in the insert liquid, the encapsulated slugs of blood being separated from each other by predetermined amounts of the inert liquid. The major portion of the apparatus passes only inert liquid, whlie the two-phase combination of inert liquid and blood passes through valve means in the apparatus in a manner to avoid mechanical damage to the blood.
Inventors
- 👤 B Hills
- 👤 G Fried
- 👤 H Langner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:54
CPC Classifications
A; A61; A61M; A61M60/00; A61M60/80; A61M60/845; A61M60/851; A61M60/10; A61M60/104; A61M60/109; A61M60/30; A61M60/36; A61M60/40; A61M60/424; A61M60/457; A61M60/462; A61M60/113; A61M60/20; A61M60/247; A61M60/253; A61M60/258; A61M60/855; A61M60/89; A61M60/892; A61M60/894; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/2931
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
163 words
Apparatus for pumping blood comprising first and second pumping means, two position valve means, injector means, and separator means, means for passing a flow of blood to said injector means, means for introducing an inert, heavy, blood immiscible liquid into said injector means for forming therein a succession of spaced slugs of encapsulated blood, conduit means preferentially wetable by said inert liquid carrying a pressure medium consisting of said inert liquid connecting said first pumping means and said valve means, said first pumping means and said valve means in one position thereof coacting to withdraw slugs of encapsulated blood from said injector means and said first pumping means and said valve means in the other position thereof coacting to pass said slugs of encapsulated blood to said separator means where the constituents of said slugs are gravimetrically separated, and conduit means connecting said separator means and said second pumping means for passing separated inert liquid from said separator means to said introducing means.
Claim 2
Dependent Claim
163 words
Apparatus for pumping blood comprising first and second pumping means, two position valve means, injector means, and separator means, means for passing a flow of blood to said injector means, means for introducing an inert, heavy, blood immiscible liquid into said injector means for forming therein a succession of spaced slugs of encapsulated blood, conduit means preferentially wetable by said inert liquid carrying a pressure medium consisting of said inert liquid connecting said first pumping means and said valve means, said first pumping means and said valve means in one position thereof coacting to withdraw slugs of encapsulated blood from said injector means and said first pumping means and said valve means in the other position thereof coacting to pass said slugs of encapsulated blood to said separator means where the constituents of said slugs are gravimetrically separated, and conduit means connecting said separator means and said second pumping means for passing separated inert liquid from said separator means to said introducing means.
Claim 3
Dependent Claim
57 words
Apparatus as in claim 1 wherein said valve means comprises a stator member having two ports and a rotor member having a single port for registry with the ports in said stator member upon movement of said rotor member, means for adjustably operating said first and second pumping means, and adjustable means for operating said rotor member.
Claim 4
Dependent Claim
60 words
Apparatus as in claim 2, wherein said pumping means operating means and said rotor member operating means are adjusted to locate successive encapsulated blood slugs on either side of the interface of said rotor and stator members whereby relative movement of said rotor and stator members will induce shearing stresses only in the liquid between successive encapsulated slugs of blood
Claim 5
Dependent Claim
15 words
Apparatus as in claim 1 wherein said conduit means has an inner surface of polytetrafluoroethylene.
Claim 6
Dependent Claim
30 words
Apparatus as in claim 1 wherein said inert liquid is a fluorocarbon having a density greater then that of blood and preferentially wets the inner surface of said conduit means.
Claim 7
Dependent Claim
15 words
Apparatus as in claim 1 wherein said first pumping means includes a single inlet-outlet means.
Claim 8
Dependent Claim
28 words
Apparatus as in claim 1 wherein said second pumping means comprises a cylinder and a piston movable in said cylinder and a lost-motion linkage for operating said piston.
Claim 9
Independent Claim
97 words
A method of pumping blood comprising the steps of injecting an inert, heavy, blood immiscible liquid into a flow of blood to form a stream of successive slugs of blood encapsulated in and separated by said liquid, pumping said stream with a pressure transmitting medium of inert, blood immiscible liquid through a two position valve in one position thereof, pumping said pumped stream through said valve in the other position thereof to a separator where the constituents of said stream are gravimetrically separated, pumping the separated inert liquid into said injecting step and withdrawing the separated blood.
Claim 10
Independent Claim
97 words
A method of pumping blood comprising the steps of injecting an inert, heavy, blood immiscible liquid into a flow of blood to form a stream of successive slugs of blood encapsulated in and separated by said liquid, pumping said stream with a pressure transmitting medium of inert, blood immiscible liquid through a two position valve in one position thereof, pumping said pumped stream through said valve in the other position thereof to a separator where the constituents of said stream are gravimetrically separated, pumping the separated inert liquid into said injecting step and withdrawing the separated blood.
Claim 11
Dependent Claim
51 words
A method as in claim 8 wherein said valve comprises a pair of relatively movable facing members, and pumping said stream of slugs of encapsulated blood through said valve members to dispose only encapsulating liquid at the interface of said valve members as said valve members move relative to each other.
Claim 12
Independent Claim
55 words
A method of encapsulating blood comprising passing a stream of blood through a conduit having an inner surface of a fluorocarbon, injecting determined quantities of an inert, blood immiscible fluorocarbon liquid into said conduit, said liquid preferentially wetting the inner surface of said conduit whereby to encapsulate and separate slugs of blood with said liquid.
Claim 13
Independent Claim
55 words
A method of encapsulating blood comprising passing a stream of blood through a conduit having an inner surface of a fluorocarbon, injecting determined quantities of an inert, blood immiscible fluorocarbon liquid into said conduit, said liquid preferentially wetting the inner surface of said conduit whereby to encapsulate and separate slugs of blood with said liquid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |