US3589360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical cable for chronic implantation within a living body
Assignee: Iowa State University Research Foundation Inc
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Filing: 1969-05-14
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Granted: 1971-06-29
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Expires: 1989-05-14
Abstract
Abstract An electrical instrument for measuring blood velocity for chronic implantation in a living body is disclosed herein. The instrument comprises a probe, an electrical cable, and a skin connector. The cable comprises a pair of coiled and insulated platinum alloy wires covered by a flexible electrically insulated material innocuous to animal tissue. The probe comprises a miniature thermistor electrically connected between the common ends of the wires and is also covered with the same electrically insulated material.
Inventors
- 👤 John C Sinclair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:22
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; A61B5/028; A61B5/07; A61B5/076
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A thermistor blood velocity flowmeter for animal implantation comprising: a cable formed from a double strand of coiled platinum alloy wire, said wires being covered by flexible electrically insulated material innocuous to the animal body tissue; a probe designed for insertion through the wall of a blood vessel formed from the common ends of said coiled wires and having a miniature thermistor responsive to temperature variance of said animal body electrically connected between said common ends of said wires, said probe being heatable above the temperature of the blood in which it is immersed and being covered by an electrically insulating body of material; external means for heating said thermistor above the temperature of the blood; and a skin connector electrically connected to said electrical cable, said skin connector being electrically connectable to an external recorder.
Claim 2
Dependent Claim
136 words
A thermistor blood velocity flowmeter for animal implantation comprising: a cable formed from a double strand of coiled platinum alloy wire, said wires being covered by flexible electrically insulated material innocuous to the animal body tissue; a probe designed for insertion through the wall of a blood vessel formed from the common ends of said coiled wires and having a miniature thermistor responsive to temperature variance of said animal body electrically connected between said common ends of said wires, said probe being heatable above the temperature of the blood in which it is immersed and being covered by an electrically insulating body of material; external means for heating said thermistor above the temperature of the blood; and a skin connector electrically connected to said electrical cable, said skin connector being electrically connectable to an external recorder.
Claim 3
Dependent Claim
53 words
The thermistor flowmeter of claim 1 wherein said common ends of said coiled wires are substantially straight and have a length one approximately twice the other, and wherein said thermistor is secured to said common ends as by suture tied, soldered joints between the short end and the long end of said wires.
Claim 4
Dependent Claim
19 words
The thermistor flowmeter of claim 2 wherein said body of material comprises a 50-50 mixture of xylene and Silastic.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |