Electrochemical measuring electrode device for simultaneously measuring the partial pressures of two gasses
First Claim
1. An electrochemical measuring electrode device for simultaneously measuring the partial pressures of two gases in a medium of limited gas availability, a first gas partial pressure being measured potentiometrically and a second gas partial pressure being measured polarographically, comprising:
- (a) an electrode body;
(b) a membrane arranged in front of said electrode body, the electrode body and the membrane together defining a space therebetween;
(c) an electrolyte solution enclosed in said space;
(d) a first electrode system for potentiometric measurement arranged in said body, said first electrode system having a reference electrode and a pH-electrode;
(e) a second electrode system for polarographic measurement arranged in said body, said second electrode system having a cathode and an anode;
said electrolyte solution communicating with said two electrode systems,said membrane comprising(i) a first part being permeable to the first gas, arranged in front of the exposed measuring surface of the pH-electrode of said first electrode system and, together with said first electrode system and said electrolyte solution, constituting a first measuring system for measuring the partial pressure of the first gas; and
(ii) a second part being permeable to the second gas, arranged in front of the exposed measuring surface of the cathode of said second electrode system and, together with said second electrode system and said electrolyte solution, constituting a second measuring system for measuring the partial pressure of said second gas;
the permeability of said second part of said membrane to the second gas being less than the permeability of said first part of said membrane to the second gas, and the permeabilities of said first and second parts of said membrane being such that said first and second measuring systems have response time characteristics differing from each other at the most by a factor of 10.
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Abstract
An electrochemical electrode device for simultaneously measuring the partial pressures of two gasses in a medium of limited gas availability one of which is measured potentiometrically and another one of which is measured polarographically comprises an electrode body (18) constituting a reference electrode relative to a pH-electrode (19) of a potentiometric electrode system, and a anode relative to a cathode (20) of a polarographic electrode system. Furthermore, the electrode device comprises an electrolyte solution (28) enclosed between the electrode body and a membrane (30). The membrane comprises a basic membrane layer (31), preferably of polytetrafluoroethylene (PTFE) or fluoroethylenepropylene (FEP) of a thickness of about 12 μm, and a covering (32), preferably a polypropylene layer of a thickness of about 15 μm, which covers part of the basic membrane layer so that an uncovered area (34) is constituted in front of the pH-electrode. The uncovered area constitutes a first membrane part showing high permeability to the first gas and constitutes together with the potentiometric electrode system and the electrolyte solution a first measuring system for measuring the partial pressure of the first gas. A covered area of the basic membrane layer constitutes together with its covering a second membrane part showing low permeability to the second gas and is arranged in front of the exposed measuring surface of the cathode so as to restrict the diffusion of the second gas to the cathode and together with the polarographic electrode system and the electrolyte solution to constitute a second measuring system for measuring the partial pressure of the second gas.
21 Citations
23 Claims
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1. An electrochemical measuring electrode device for simultaneously measuring the partial pressures of two gases in a medium of limited gas availability, a first gas partial pressure being measured potentiometrically and a second gas partial pressure being measured polarographically, comprising:
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(a) an electrode body; (b) a membrane arranged in front of said electrode body, the electrode body and the membrane together defining a space therebetween; (c) an electrolyte solution enclosed in said space; (d) a first electrode system for potentiometric measurement arranged in said body, said first electrode system having a reference electrode and a pH-electrode; (e) a second electrode system for polarographic measurement arranged in said body, said second electrode system having a cathode and an anode; said electrolyte solution communicating with said two electrode systems, said membrane comprising (i) a first part being permeable to the first gas, arranged in front of the exposed measuring surface of the pH-electrode of said first electrode system and, together with said first electrode system and said electrolyte solution, constituting a first measuring system for measuring the partial pressure of the first gas; and (ii) a second part being permeable to the second gas, arranged in front of the exposed measuring surface of the cathode of said second electrode system and, together with said second electrode system and said electrolyte solution, constituting a second measuring system for measuring the partial pressure of said second gas; the permeability of said second part of said membrane to the second gas being less than the permeability of said first part of said membrane to the second gas, and the permeabilities of said first and second parts of said membrane being such that said first and second measuring systems have response time characteristics differing from each other at the most by a factor of 10. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A membrane for an electrochemical measuring electrode device for simultaneously measuring the partial pressures of two gases in a medium of limited gas availability, a first gas being measured potentiometrically, and a second gas being measured polarographically, comprising:
a first part showing permeability to the first gas and adapted to be arranged in front of an exposed measuring surface of a pH-electrode of a potentiometric pH-measuring electrode system and, together with the potentiometric pH-measuring electrode system and an electrolyte solution, to constitute a first measuring system for measuring the partial pressure of the first gas, and a second part showing permeability to the second gas and adapted to be arranged in front of an exposed measuring surface of a cathode of a polarographic electrode system and, together with the polarographic electrode system and the electrolyte solution, to constitute a second measuring system for measuring the partial pressure of the second gas, said permeability of the second part of the membrane to the second gas is less than the permeability of the first part of the membrane to the second gas, and in that the first and the second parts, respectively, of the membrane are adapted to provide response time characteristics of the first and second measuring systems differing from each other at the most by a factor of 10. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
Specification
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- Resources
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Current AssigneeRadiometer A/S (Danaher Corporation)
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Original AssigneeRadiometer A/S (Danaher Corporation)
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InventorsPedersen, Knud G.
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Primary Examiner(s)Nguyen, Nam X.
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Application NumberUS07/129,428Time in Patent Office559 DaysField of Search204/403, 204/412, 204/415, 204/416, 204/417, 204/418, 204/419, 204/420, 128/635US Class Current204/403.13CPC Class CodesA61B 5/14542 for measuring blood gases A...A61B 5/1477 non-invasiveG01N 27/404 Cells with anode, cathode a...
