Patent US5298960A successfully refreshed from Google Patents.
Patent US3631607A successfully refreshed from Google Patents.
US3631607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mock circulation
Assignee: University of Utah
•
Filing: 1969-10-27
•
Granted: 1972-01-04
•
Expires: 1989-10-27
Abstract
Abstract The invention disclosed herein relates to a device for simulating the hydraulic impedance of the blood circulatory system for the purpose of evaluating artificial hearts, heart valves, heart bypass methods, and control systems for artificial hearts. The evaluation of these items relates both to their overall performance and to the durability of their materials of construction.
Inventors
- 👤 Willem J Kolff
- 👤 Stephen C Jacobsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:08
CPC Classifications
G; G09; G09B; G09B23/00; G09B23/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
In an apparatus for applying a complex impedance to a fluid from a pumping device undergoing evaluation, said fluid impedance apparatus comprising a plurality of serially disposed, interconnected, and enclosed chambers having at least one vertical partition disposed in each chamber to direct said fluid in a predetermined path and wherein the volume of a compressible gas entrapped above the fluid in each chamber can be suitably altered to simulate various impedances to the flow of fluid through the apparatus, flow-rate-measuring means interposed in said fluid streaM, and a fluid reservoir means for retention of said fluid upon exit from said apparatus and before said fluid is returned to said pumping device.
Claim 2
Dependent Claim
112 words
In an apparatus for applying a complex impedance to a fluid from a pumping device undergoing evaluation, said fluid impedance apparatus comprising a plurality of serially disposed, interconnected, and enclosed chambers having at least one vertical partition disposed in each chamber to direct said fluid in a predetermined path and wherein the volume of a compressible gas entrapped above the fluid in each chamber can be suitably altered to simulate various impedances to the flow of fluid through the apparatus, flow-rate-measuring means interposed in said fluid streaM, and a fluid reservoir means for retention of said fluid upon exit from said apparatus and before said fluid is returned to said pumping device.
Claim 3
Dependent Claim
26 words
An apparatus for applying a complex pumping impedance to a fluid pumping device as described in claim 1 wherein the pumping device is an artificial heart.
Claim 4
Dependent Claim
35 words
An apparatus for applying a complex pumping impedance to a fluid pumping device as described in claim 1 wherein the pumping impedance simulates at least a portion of the blood circulatory system of a body.
Claim 5
Dependent Claim
46 words
An apparatus for applying a complex pumping impedance to a fluid pumping device as described in claim 1 wherein a separate pumping impedance device is utilized to simulate an aortic circulatory system and another separate pumping impedance device is utilized to simulate a pulmonary circulatory system.
Claim 6
Dependent Claim
42 words
An apparatus for applying a complex pumping impedance to a fluid-pumping device as described in claim 4 wherein the two separate pumping impedance devices are suitably interconnected with the artificial heart pumping device to simulate the total circulatory system of a body.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |