Thermistor assist sensing

Details Thermistor assist sensing Thermistor assist sensing

1979-03-05

1981-03-17

Recla, Henry J.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820426, A61M 1600

Patent

active

042561019

ABSTRACT:
A sensor for the detection of a very feeble effort to breathe on the part of a patient whose breathing needs are under the influence and control of a mechanical ventilator. A self-heated thermistor is mounted in a small diameter sensor tube. A diaphragm and chamber arrangement limits the volume of air that flows in the sensor tube past the self-heated thermistor. The self-heated thermistor is mounted in the center of the small diameter sensor tube so that a low volume flow rate of fluid will cause a relatively large amount of cooling. Thus a very small effort to breathe will draw a limited volume of fluid past the thermistor at a high velocity, causing rapid cooling. A voltage change resulting across the thermistor is utilized to signal a patient effort to breathe and to command the ventilator to furnish an assisted breath where appropriate.

REFERENCES:
patent: 3952739 (1976-04-01), Cibulka
patent: 3962917 (1976-06-01), Terada
patent: 3972327 (1976-08-01), Ernst et al.
patent: 4043196 (1977-08-01), Trageser
patent: 4106503 (1978-08-01), Rosenthal et al.
patent: 4141356 (1979-02-01), Smargiassi

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