Patent US4217910A successfully refreshed from Google Patents.
US4217910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal jugular and left ventricular thermodilution catheter
Assignee: United States Department of the Navy
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Filing: 1978-10-10
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Granted: 1980-08-19
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Expires: 1998-10-10
Abstract
Abstract A thermodilution catheter having a distal high frequency heating coil of fine wires, heat measuring thermocouples, and a proximal resistance thermometer, all wound externally on a catheter for measuring blood flow in either the jugular vein or the left ventricle of the heart. The device also incorporates electrodes for electrocardiogram tracings.
Inventors
- 👤 Hassan H. Khalil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:14
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; A61B5/028; A61B5/24; A61B5/25; A61B5/279; A61B5/28; A61B5/283
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A bioelectric measuring apparatus for insertion within a living organism comprising: an elongated, flexible, catheter body having a distal or tip end and a proximal segment; main heating means, mounted on the distal or top end of said catheter body, for tepefying the surrounding substance of said living organism; temperature measuring means, mounted on the proximal segment of said catheter body, for quantifying the amount of caloric energy conducted to the surrounding substance of said living organism; and auxiliary heating means, electrically connected to said main heating means by lead wires, for providing heat to said lead wires.
Claim 2
Dependent Claim
98 words
A bioelectric measuring apparatus for insertion within a living organism comprising: an elongated, flexible, catheter body having a distal or tip end and a proximal segment; main heating means, mounted on the distal or top end of said catheter body, for tepefying the surrounding substance of said living organism; temperature measuring means, mounted on the proximal segment of said catheter body, for quantifying the amount of caloric energy conducted to the surrounding substance of said living organism; and auxiliary heating means, electrically connected to said main heating means by lead wires, for providing heat to said lead wires.
Claim 3
Dependent Claim
25 words
A bioelectric measuring apparatus for insertion with a living organism according to claim 1 wherein said main heating means is a bifiliary wound heating coil.
Claim 4
Dependent Claim
24 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 1 wherein said temperature measuring means comprises a platinum resistance thermometer.
Claim 5
Dependent Claim
60 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 1 wherein said auxillary heating means comprises; a heating coil detached from said body for heating said lead wires; and switching means, electrically connected to said main heating means and said heating coil for selectively supplying current to either said main heating means or said heating coil.
Claim 6
Dependent Claim
33 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 5 wherein said heating coil comprises a bifilarlywound coil with an impedance identical to that of said main heating means.
Claim 7
Dependent Claim
25 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 4 wherein said switching means comprises a double pole double throw switch.
Claim 8
Dependent Claim
50 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 1 further comprising conducting means, mounted on said body, for electrical contact with said living organism; and temperature transducing means mounted on said body, for sensing the temperature of said body produced by said main heating means.
Claim 9
Dependent Claim
23 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 7 wherein said conducting means comprises one or more electrodes.
Claim 10
Dependent Claim
21 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 8 wherein said electrodes comprise bare platinum electrodes.
Claim 11
Dependent Claim
39 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 7 wherein said temperature transducing means comprises; a thermocouple positioned along said main heating means; and a reference thermocouple positioned proximally to said main heating means.
Claim 12
Dependent Claim
21 words
A bioelectric measuring apparatus for insertion within a living organism according to claim 10 wherein said thermocouples are copper constantan thermocouples.
References Cited (Backward Citations)
US3075555A
Cited
US3359974A
Cited
US3438253A
Cited
US3478588A
Cited
US3595079A
Cited
US3623364A
Cited
US3722505A
Cited
US3734083A
Cited
US3798967A
Cited
US3789831A
Cited
US3995623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |