PO.sub.2 /PCO.sub.2 sensor
First Claim
Patent Images
1. An electrochemical sensor for the simultaneous and continuous measurements of PO2 and PCO2 in fluids which comprises:
- (a) an electrode chamber having within;
a first electrode responsive to pH changes produced by the presence of carbon dioxide, a second electrode capable of electrochemically reducing oxygen. a reference electrode for each of or common to the first and second electrodes, means for holding first electrode, second electrode and reference electrode in spaced apart, insulated relationship. an electrolyte in contact with the reference electrode and first and second electrodes;
(b) a membrane permeable to oxygen and carbon dioxide having a first and second side, the first side being in contact with the electrolyte and the second side available for exposure to carbon dioxide and oxygen gases from fluid to be tested, said membrane holding the electrolyte in contact with the electrodes and providing for entry of oxygen and carbon dioxide gas into the electrolyte; and
said membrane being also permeable to water when the electrolyte is solid.
7 Assignments
0 Petitions
Accused Products
Abstract
This invention relates to an electrochemical sensor system for the simultaneous and continuous measurement of the partial pressure of oxygen PO2 and carbon dioxide partial pressure PCO2 in fluids. The electrochemical sensor of the present invention is particularly useful for intra-arterial measuring PCO2 and PO2 in blood and is readily adapted to transcutaneous measurement of these blood gases by the addition of a heating element and minor configurational changes.
76 Citations
10 Claims
-
1. An electrochemical sensor for the simultaneous and continuous measurements of PO2 and PCO2 in fluids which comprises:
-
(a) an electrode chamber having within; a first electrode responsive to pH changes produced by the presence of carbon dioxide, a second electrode capable of electrochemically reducing oxygen. a reference electrode for each of or common to the first and second electrodes, means for holding first electrode, second electrode and reference electrode in spaced apart, insulated relationship. an electrolyte in contact with the reference electrode and first and second electrodes; (b) a membrane permeable to oxygen and carbon dioxide having a first and second side, the first side being in contact with the electrolyte and the second side available for exposure to carbon dioxide and oxygen gases from fluid to be tested, said membrane holding the electrolyte in contact with the electrodes and providing for entry of oxygen and carbon dioxide gas into the electrolyte; and
said membrane being also permeable to water when the electrolyte is solid. - View Dependent Claims (4, 5, 6, 7, 8, 9)
-
-
2. An electrochemical sensor for the simultaneous and continuous measurements of PO2 and PCO2 in fluids which comprises
(a) an electrode chamber having within: - a first electrode responsive to pH changes produced by the presence of carbon dioxide,
a second electrode capable of electrochemically reducing oxygen, a reference electrode for each of or common to the first and second electrodes, means for holding first electrode, second electrode and reference electrode in spaced apart, insulated relationship, a solid electrolyte in contact with the reference electrode and first and second electrodes; (b) a membrane permeable to water, oxygen and carbon dioxide having a first and second side, the first side being in contact with the electrolyte and the second side available for exposure to carbon dioxide and oxygen gases from fluid to be tested, said membrane holding the electrolyte within in contact with the electrodes and providing for entry of oxygen and carbon dioxide gas into the electrolyte. - View Dependent Claims (10)
- a first electrode responsive to pH changes produced by the presence of carbon dioxide,
-
3. An electrochemical sensor for the simultaneous and continuous transcutaneous measurements of PO2 and PCO2 through animal skin which comprises:
-
(a) an electrode chamber having within; a first electrode responsive to pH changes produced by the presence of carbon dioxide, a second electrode capable of electrochemically reducing oxygen, a reference electrode for each of or common to the first and second electrodes, means for holding first electrode, second electrode and reference electrode in spaced apart, insulated relationship, an electrolyte in contact with the reference electrode and first and second electrodes; (b) a membrane permeable to oxygen and carbon dioxide having a first and second side, the first side being in contact with the electrolyte and the second side available for exposure to carbon dioxide and oxygen gases from the animal skin to be tested, said membrane holding the electrolyte in contact with the electrodes and providing for entry of oxygen and carbon dioxide gas into the electrolyte and (c) a controlled heating element associate with the electrode chamber for heating the animal skin in contact with or in proximity to the membrane.
-
Specification