Electrochemical sensor

• US 3,905,888 A
• Filed: 04/29/1974
• Issued: 09/16/1975
• Est. Priority Date: 05/10/1973
• Status: Expired due to Term

• Current Assignee: Kontron (S&T AG)
• Original Assignee: Willy Fehlmann, Wolfgang Mindt
• Inventors: Mindt, Wolfgang, Fehlmann, Willy
• Primary Examiner(s): Kaplan, G. L.
• Application Number:
  US05/465,191
• Time in Patent Office: 505 Days
• Field of Search: 204/195P,1T 128/2E,2.1E
• US Class Current: 204/415
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1473 invasive, e.g. introduced into the body by a catheter A61B5/1482 takes precedence
• CPC Class Codes: G01N 27/404 Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid , e.g. Clark-type oxygen sensors

Abstract

An electrochemical sensor is disclosed for determining the oxygen partial pressure, particularly in biological media in vivo. The arrangement includes a tubular flexible plastic member closed at one end which is permeable to oxygen and houses a pair of electrodes in a chamber portion thereof which contains an electrolyte. A portion of the chamber is filled with a sealing compound which partially embeds the electrodes, and the electrodes are arranged such that they project into the chamber at two different distances to be in contact with the electrolyte. The longer wire is provided with an insulating layer in the region over which the shorter wire extends.

Claims

1. AN ELECTROCHEMICAL SENSOR FOR DETERMINING THE OXYGEN PARTIAL PRESSURE, IN WHICH TWO ELECTRODES ARE DISPOSED IN A CHAMBER WHICH CONTAINS AN ELECTROLYTE AND THE WALLS OF WHICH ARE PERMEABLE TO OXYGEN, COMPRISING THE CHAMBER BEING DEFINED BY THE INTERIOR OF A TUBE OF A FLEXIBLE MATERIAL PERMEABLE TO OXYGEN, AND WHICH CHAMBER IS PARTIALLY FILLED WITH A SEALING COMPOUND AND CLOSED AT THE END THEREOF WHICH CONTAINS THE ELECTROLYTE, THE ELECTRODES INCLUDING A PAIR OF WIRES PARALLEL TO THE LONGITUDINALL AXIS OF THE TUBE WHICH ARE PARTIALLY EMBEDDED IN THE SEALING COMPOUND, THEIR ENDS PROJECTING TWO DIFFERENT DISTANCES INTO THE INTERIOR OF THE TUBE AND A LONGITUDINAL PORTION OF EACH END BEING IN CONTACT WITH THE ELECTROLYTE, THE LONGER ONE OF SAID WIRES HAVING AN INSULATING LAYER IN THE REGION OVER WHICH THE SHORTER WIRE EXTENDS, THE ACTIVE SURFACES OF THE ELECTRODES BEING FORMED BY THE NONINSULATED SURFACES OF THE WIRE ENDS WHICH FACE THE INNER SURFACE OF THE BODY.

2. The sensor according to claim 1 wherein said tube is made of a plastics material.