Patent US5169381A successfully refreshed from Google Patents.
US5169381A
Expired / Lapsed
US
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Ventricular assist device
Assignee: Individual
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Filing: 1991-03-29
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Granted: 1992-12-08
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Expires: 2011-03-29
Abstract
Abstract A ventricular assist device for documenting compressive forces on the right and left ventricular surface of a heart in terms of pressure reactions transmitted from fluid contents in sacs adjacent to these ventricular surfaces to apparatus for displaying the reactions, and a method of monitoring these pressure forces and their effects on the ventricular surfaces for circulating the blood from the ventricular blood pools into the right and left arterial systems.
Inventors
- 👤 Robert V. Snyders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:00
CPC Classifications
A; A61; A61M; A61M60/00; A61M60/50; A61M60/585; A61M60/10; A61M60/122; A61M60/165; A61M60/191; A61M60/20; A61M60/289; A61M60/40; A61M60/465; A61M60/468; A61M60/508; A61M60/515; A61M60/80; A61M60/839; A61M60/855; A61M60/857
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
In a ventricular assist device to enclose the right and left ventricular surfaces of a heart in a shell having interior flexible membranes attached to the shell to define right and left epicardial sacs adjacent to the ventricular heart myocardium and fluid pressure conduits connected into said sacs, the improvement which comprises: (a) separate pressure conduits entering the right and left sacs from the exterior of the device; and (b) means connected to each of said pressure conduits for generating documentation of the pressure conditions in said sacs.
Claim 2
Dependent Claim
88 words
In a ventricular assist device to enclose the right and left ventricular surfaces of a heart in a shell having interior flexible membranes attached to the shell to define right and left epicardial sacs adjacent to the ventricular heart myocardium and fluid pressure conduits connected into said sacs, the improvement which comprises: (a) separate pressure conduits entering the right and left sacs from the exterior of the device; and (b) means connected to each of said pressure conduits for generating documentation of the pressure conditions in said sacs.
Claim 3
Dependent Claim
22 words
The improvement set forth in claim 1 wherein said separate conduits enter the right and left sacs through the fluid pressure conduits.
Claim 4
Dependent Claim
42 words
The improvement set forth in claim 1 wherein said separate conduits enter the right and left sacs through the fluid pressure conduits, and said entry of said separate conduits into said pressure conduits is through sealed junctions substantially close to the shell.
Claim 5
Dependent Claim
28 words
The improvement set forth in claim 1 wherein said means connected to each of said pressure conduits include transducers for converting pressure values into substantially equivalent electrical signals.
Claim 6
Dependent Claim
22 words
The improvement set forth in claim 1 wherein said documentation generating means includes digital pressure readouts for the right and left sacs.
Claim 7
Independent Claim
63 words
A method of documenting pressure conditions in a heart assist monitoring device consisting of (a) forming right and left epicardial sacs adjacent to the ventricular surfaces of a heart; (b) supplying a pressure medium to the sacs at a sufficient value to follow the heart functions; and (c) monitoring the pressure medium response and visually displaying the value of the pressure so monitored.
Claim 8
Independent Claim
63 words
A method of documenting pressure conditions in a heart assist monitoring device consisting of (a) forming right and left epicardial sacs adjacent to the ventricular surfaces of a heart; (b) supplying a pressure medium to the sacs at a sufficient value to follow the heart functions; and (c) monitoring the pressure medium response and visually displaying the value of the pressure so monitored.
References Cited (Backward Citations)
SU200117A1
Cited
US2826193A
Cited
US3371662A
Cited
US3985123A
Cited
US4536893A
Cited
US4690134A
Cited
US4957477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |