Thermal method for measuring blood perfusion

Details Thermal method for measuring blood perfusion Thermal method for measuring blood perfusion

1981-12-14

1983-09-13

Apley, Richard J.

Surgery

Truss

Pad

128713, A61B 508

Patent

active

044036159

ABSTRACT:
A thermal method for measuring blood perfusion. One temperature sensor is emplaced in contact with an organ of the patient. Another temperature sensor is inserted in a central artery of the patient. A fluid having a temperature substantially lower then the temperature of the blood of the patient is injected into a vein of the patient. The thermal temperature gradient of the blood perfusion through a portion of the organ in the patient's body is recorded. The thermal temperature gradient of the blood flow through the artery of the patient is also recorded. The area under the curve determined by the thermal temperature gradient of the blood perfusion through the portion of organ of the patient and the area under the curve determined by the thermal temperature gradient of the arterial blood flow are calculated. The difference between the two calculated areas is then determined to provide an indication of the rate of blood perfusion through the portion of the organ in the patient's body.

REFERENCES:
patent: 3915155 (1975-10-01), Jacobson et al.
patent: 4228805 (1980-10-01), Rosen et al.
patent: 4230126 (1980-10-01), Elings
Petrofsy, "In Vivo Measurement of Brain Blood Flow in the Cat; IEEE Transactions on Biomedical Engineering," vol. BME-26, No. 8, Aug. 1979.
Ellis et al., "Computerized Monitoring of Cardiac Output by Thermal Dilution"; Journal of the Association of Medical Instrumentation, vol. 6, No. 2, (Mar.-Apr. 1972).
Bourdillion et al., "Saline Conductivity Method for Measuring Cardiac Output Simplified"; Medicol & Biological Engineering and Computing, May 1979, pp. 323-329.
Mendler et al., "Automated Cardiac Output Determination by Indicator Dilution in a Computerized Patient Monitoring System"; Conference: Computers in Cardiology, (Sep. 29, 1977).

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