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AssigneeNovametrix Medical Systems, Inc.
InventorRichard A. Mentelos
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An improved apparatus for non-invasive measurement of transcutaneous carbon dioxide pressure employs a skin engaging sensor including pH and reference electrodes and a temperature sensor. The temperature sensor produces an output signal voltage having a characteristic which can be the same as or the complement of the voltage-temperature characteristic of the deviation voltage component of the pH-reference electrode voltage attributable to temperature deviation effects on the sensor as well as on the skin. An error signal voltage produced at the output of the temperature sensor is combined with the voltage measured across the pH and reference electrodes to provide a corrected voltage having a magnitude indicative of transcutaneous carbon dioxide pressure at a predetermined reference temperature without need to heat the skin or electrode or otherwise control their temperatures.
A transcutaneous carbon dioxide probe for producing a signal having a characteristic with a magnitude indicative of carbon dioxide perfusion through the skin substantially independent of temperature variations comprising
A transcutaneous carbon dioxide sensor comprising a pH electrode, a reference electrode, a carbon dioxide dissolving solution in contact with said electrodes and means for engaging the skin surface of a person whose carbon dioxide pressure output is to be measured, said engaging means maintaining said solution in contact with said electrodes and being permeable to carbon dioxide to permit the carbon dioxide to be measured to be dissolved in said solution, measuring circuit means responsive to the voltage induced across said pH and reference electrodes in response to the carbon dioxide dissolved in said solution for producing an output signal having a characteristic with a magnitude indicative of the pressure of carbon dioxide transcutaneous through the skin,
Apparatus for measuring transcutaneous carbon dioxide comprising a sensor including a pH electrode, a reference electrode, a carbon dioxide dissolving solution in contact with said pH and reference electrodes, said solution generating a voltage across said electrodes when carbon dioxide is dissolved therein and means for engaging the skin surface of a person whose carbon dioxide output is to be sensed, said engaging means having one surface in contact with said solution, said engaging means being permeable to carbon dioxide to permit the carbon dioxide to be sensed to be dissolved in said solution,
A method of correcting the output signal of a transcutaneous carbon dioxide measuring apparatus having a skin engaging probe and means for generating said output signal in response to transcutaneous carbon dioxide gas pressure sensed by said probe to correct for deviations in temperature from a predetermined reference temperature comprising
Dependencies are inferred from the claim text.