Thermal protective circuit for a hyperemia-inducing physiological sensor
First Claim
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1. A physiological sensor for the transcutaneous determination of physiological phenomena, comprisinga heater element;
- a remote source of power for energizing the heater element;
control means, including the power source, the heater element and a first temperature-responsive device, for thermostatically maintaining the temperature of the sensor substantially constant during normal use of the sensor; and
safety means, including a second temperature-responsive device, for interrupting energization of the heater element by maintaining the heater element disconnected from the power source whenever, due to failure of the control means, the temperature of the sensor exceeds a predetermined ceiling level, until intervention by an operator restores energization conditions.
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Abstract
A sensor for transcutaneous measurement of physiological phenomena of living tissues is provided with a thermostatically-controlled electric heater. The purpose of the heater is to induce local hyperemia to enable operation of the sensor. The heater is thermostatically controlled. An independent temperature sensor is provided to disable the heater in the event of catastrophic failure of the thermostat circuit.
20 Citations
4 Claims
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1. A physiological sensor for the transcutaneous determination of physiological phenomena, comprising
a heater element; -
a remote source of power for energizing the heater element; control means, including the power source, the heater element and a first temperature-responsive device, for thermostatically maintaining the temperature of the sensor substantially constant during normal use of the sensor; and safety means, including a second temperature-responsive device, for interrupting energization of the heater element by maintaining the heater element disconnected from the power source whenever, due to failure of the control means, the temperature of the sensor exceeds a predetermined ceiling level, until intervention by an operator restores energization conditions.
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- 2. Sensor in accordance with claim 2, wherein the safety means include a normally-closed temperature-sensitive switch cooperating with a latching relay which is resettable by hand.
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Current AssigneePPG Hellige GmbH
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Original AssigneeHellige GmbH
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InventorsLeist, Helmut, Ullrich, Georg J.
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Primary Examiner(s)Recla, Henry J.
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Assistant Examiner(s)JAWORSKI, FRANCIS J
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Application NumberUS06/130,639Time in Patent Office820 DaysField of Search128/631-635, 128/736, 128/742, 128/399, 128/401, 337/1, 337/14, 337/385, 337/298US Class Current600/358CPC Class CodesA61B 5/1491 Heated applicatorsG05D 23/1928 sensing the temperature of ...G12B 7/00 Compensating for the effect...
