Surgery – Truss – Pad
Patent
1981-08-17
1983-04-19
Kamm, William E.
Surgery
Truss
Pad
128734, A61B 502
Patent
active
043802370
ABSTRACT:
An improved catheter probe includes a conductivity sensor comprising four electrodes configured and spaced to be electrically coupled together by vascular fluids. A current source is provided for driving current through the vascular fluid between one pair of electrodes, and voltage sensing means is provided for measuring the voltage between the other pair of electrodes. In the preferred embodiment, the electrodes are closely spaced, substantially parallel electrodes oriented along the longitudinal direction of the catheter and transversely spaced apart by a distance which is small compared to the diameter of the catheter. The longitudinal length of the electrodes is chosen to be large as compared to the transverse spacing. The preferred current source is an isolated AC source, and the preferred voltage detection means is a phase sensitive voltage detector selectively responsive to the frequency and phase of the current source.
REFERENCES:
patent: 2661734 (1953-12-01), Holzer et al.
patent: 3149627 (1964-09-01), Bagno
patent: 3566233 (1971-02-01), Kahn et al.
patent: 3572315 (1971-03-01), Cullen
patent: 3994284 (1976-11-01), Voelker
patent: 3995623 (1976-12-01), Blake et al.
Kamm William E.
Massachusetts General Hospital
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