Thermocouple-based blood flow sensor

Details Thermocouple-based blood flow sensor Thermocouple-based blood flow sensor

1991-08-12

1992-12-29

Kamm, William E.

Surgery

Truss

Pad

128736, 732025, A61B 502

Patent

active

051742993

ABSTRACT:
A thermocouple-based cardiac blood flow sensor for allowing discrimination between physiologic rhythms and pathologic rhythms of the heart. The sensor is built on a cardiac catheter or lead from a union of two dissimilar metals. The thermocouple junction is radially activated by blood flowing past the junction while situated in a blood vessel such as the superior vena cava. Temperature differences measured at axially displaced sites are related to blood flow and blood velocity. The thermocouple-based blood flow sensor is easy to use and unobtrusive. A further feature incorporates electrodes whereby impedance plethysmography can be used to determine blood vessel cross-sectional area so that blood flow through vessels which change in size can be assessed.

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