Temperature sensor with calibrated analog resistive output
First Claim
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1. Thermometric apparatus, comprising:
- at least one body-surface sensor, which is configured to be placed at a location on a body surface of a patient and generates a sensor output that varies according to a body-surface temperature at the location;
a connector for coupling to a patient monitor; and
analog conversion circuitry, which is coupled between the at least one body-surface sensor and the connector and consists only passive components, which are configured to convert the sensor output by means of an analog operation into an output resistance across the connector that is indicative of a corrected temperature of the patient, without conversion of the sensor output into digital form and re-conversion of digital values back to resistance.
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Abstract
Thermometric apparatus includes at least one body-surface sensor, which is configured to be placed at a location on a body surface of a patient and generates a sensor output that varies according to a body-surface temperature at the location. Analog conversion circuitry is coupled between the at least one body-surface sensor and a connector for coupling to a patient monitor. The circuitry is configured to convert the sensor output into an output resistance across the connector that is indicative of a corrected temperature of the patient.
30 Citations
20 Claims
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1. Thermometric apparatus, comprising:
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at least one body-surface sensor, which is configured to be placed at a location on a body surface of a patient and generates a sensor output that varies according to a body-surface temperature at the location; a connector for coupling to a patient monitor; and analog conversion circuitry, which is coupled between the at least one body-surface sensor and the connector and consists only passive components, which are configured to convert the sensor output by means of an analog operation into an output resistance across the connector that is indicative of a corrected temperature of the patient, without conversion of the sensor output into digital form and re-conversion of digital values back to resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for thermometry, comprising:
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placing at a location on a body surface of a patient at least one body-surface sensor, thermistor, which generates a sensor output that varies according to a body-surface temperature at the location; coupling analog resistance-conversion circuitry consisting only of analog passive components to the at least one body-surface thermistor so as to convert the thermistor resistance value, using said only passive components, by means of an analog operation into an output resistance that is indicative of a corrected temperature of the patient, without conversion of the sensor output into digital form and re-conversion of digital values back to resistance; and coupling the output resistance to an input of a patient monitor, wherein said analog conversion circuit is coupled between the at least one body-surface thermistor and a connector coupling to the patient monitor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification