Temperature control system for cutaneous gas monitor
First Claim
1. A temperature control system for a cutaneous gas sensor of the type having a temperature sensing element for producing an output signal indicative of the actual temperature of the sensor, and a heating element, comprising:
- (a) a temperature setting means generating a setpoint signal, the setpoint signal being variable between, at least, a first and a second temperature, the first temperature being substantially the temperature of the sensor when measurements of a body are made, and the second temperature being substantially the temperature of the sensor when the sensor accelerates the heating of at least part of the body before the measurements of the body are made, and(b) a closed loop temperature control circuit, connected to the temperature setting means and responsive to the setpoint signal and responsive to the output signal, for varying the flow of current through the heating element.
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Accused Products
Abstract
A temperature control system for an electrically heated cutaneous gas sensor. A closed loop temperature control circuit varies the current through the heating element, in accordance with the sensed temperature of the sensor, to maintain the sensor at a temperature approximately equal to that set by a temperature setpoint signal. As the sensor is first placed on a patient, the magnitude of the temperature setpoint signal is increased above its normal value, for a predetermined time, in order to decrease the time delay between the time that the sensor is placed on the patient and the time that the sensor begins to provide usable data.
16 Citations
16 Claims
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1. A temperature control system for a cutaneous gas sensor of the type having a temperature sensing element for producing an output signal indicative of the actual temperature of the sensor, and a heating element, comprising:
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(a) a temperature setting means generating a setpoint signal, the setpoint signal being variable between, at least, a first and a second temperature, the first temperature being substantially the temperature of the sensor when measurements of a body are made, and the second temperature being substantially the temperature of the sensor when the sensor accelerates the heating of at least part of the body before the measurements of the body are made, and (b) a closed loop temperature control circuit, connected to the temperature setting means and responsive to the setpoint signal and responsive to the output signal, for varying the flow of current through the heating element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A temperature control system for a cutaneous gas sensor of the type having a temperature sensing element and a heating element, comprising:
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(a) a closed loop temperature control circuit for varying the flow of current through the heating element, in accordance with the temperature sensed by the sensing element, to maintain the temperature of the sensor approximately equal to a temperature variable between at least a first and a second temperature, established by a setpoint signal, and (b) a computer controlled temperature setting means that is programmed to; (i) establish the first temperature when measurements of the body are taken, and (ii) establish the second temperature, for a predetermined time period while the sensor is applied to the body for accelerating the heating of part of the body before the measurements are made. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification