Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1985-01-28
1986-12-09
Goldstein, Herbert
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604246, 73204, A61M 500
Patent
active
046278400
ABSTRACT:
The flow monitoring device is used with a pump casing on an outflow tube having a passageway therethrough with a wall thereabout. A solenoid pump communicates with the passageway for providing pulsatile liquid flow therethrough. A reduced-in-thickness area along the wall of the casing or outflow tubing has an outside surface establishing a site to measure pulsatile flow along an adjacent inside surface. A thermistor is mounted on the outside surface of the wall area for sensing the temperature thereof in response to pulsatile flow therebeneath. The thermistor is electrically energized at a predetermined level. A control circuit regulates the input of electrical energy to the thermistor for predetermined time periods. The control circuit includes a sample and hold circuit and a reset switching circuit responsive to the pump activation for supplying thermistor power after pumping begins. An amplifier in the control circuit compares differences in the input power to the thermistor during a selected time interval to measure the pulsatile flow rate through the passageway.
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Lilley et al, "The Use of Electronic Prediction to Achieve Fast Response from a Simple Thermal Mass Flowmeter", in Journ. of Physics E, vol. 8, #1, pp. 3-5, 1/75.
Bulletin 600 published by CGS/Datametrics, a Division of CGS Scientific Corporation of Watertown, Mass., "Heat Sensor Finds Wide Applications in Fluid Flow Measurements", 1970.
Cuadra Emilio
DelValle Roberto
Collins Henry W.
Cordis Corporation
Goldstein Herbert
Vigil Thomas R.
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