Electrochemical electrode with heating means

• US RE31,440 E
• Filed: 01/18/1978
• Issued: 11/15/1983
• Est. Priority Date: 10/01/1970
• Status: Expired due to Term

• Current Assignee: Hoffmann-La Roche Incorporated (Roche Holding AG)
• Original Assignee: Hoffmann-La Roche Incorporated (Roche Holding AG)
• Inventors: Eberhard, Patrick, Mindt, Wolfgang, Hammacher, Konrad
• Primary Examiner(s): Howell, Kyle L.
• Application Number:
  US06/870,392
• Time in Patent Office: 2,127 Days
• Field of Search: 128/2 E, 128/21 E, 128/399, 128/303.1, 128/635, 324/30 R, 204/195 B, 204/195 P
• US Class Current: 600/353
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1477 non-invasive
• 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 electrode arrangement for application to a body surface for bloodless measurement in connection with the concentration or the partial pressure of a gas in the blood comprising a sensor unit having a face member for body contact, and a heating unit coupled to the sensor unit for transmitting to said face member a thermal condition for thermal stimulation of the local blood circulation. In a further embodiment, the sensor unit includes at the face member a cover membrane permeable for a gas to be measured.

Claims

1. An electrode arrangement for application to a body surface for bloodless measurement in connection with the concentration or the partial pressure of a gas in the blood .[.including.]. .Iadd.comprising.Iaddend., sensor means for .Iadd.electrochemically .Iaddend.deriving.Iadd., .Iaddend.in vivo.Iadd., .Iaddend.electrical signals indicative of the .Iadd.concentration or .Iaddend.partial pressure of gas in .Iadd.the .Iaddend.blood .[.and having.]. .Iadd., said sensor means including .Iaddend.a face member .[.adapted.]. for body contact.[., the improvement comprising:

.]..Iadd.; and

.Iaddend.heating means in direct thermal contact with .[.said sensor means and adapted to transmit to said face member a thermal condition for thermal stimulation at the applied body surface of local blood circulation.]. .Iadd.the face member for transmitting heat throughout the face member into the body tissue directly therebeneath to produce a condition of sufficient hyperemia in said body tissue.Iaddend..

2. An electrode arrangement according to claim 1 whereby said heating means includes a current source and a resistance winding connected from said current source.

3. An electrode arrangement according to claim 2 whereby said heating means also includes:

thermally conductive block means positioned in thermal contact with said sensor means and said winding being mounted on said block means.

4. An electrode arrangement according to claim 3 whereby said face member is of a material adapted for catalysing the electrochemical reaction at the body surface to which applied.

5. An electrode arrangement according to claim 4 whereby the face member of said sensor means is of platinum.

6. An electrode arrangement according to claim 3 whereby said sensor means further includes at said face member a cover membrane, permeable for the gas to be measured.

7. An electrode arrangement according to claim 1, whereby said heating means includes:

temperature regulating means having a temperature-measuring element the measuring probe of which is mounted in the vicinity of said sensor means.

8. An electrode arrangement for application to a body surface for bloodless measurement in connection with the concentration or the partial pressure of a gas in the blood comprising:

a substantially cylindrical electrically and heat conductive member provided with an encircling recess about its outer surface and a first axial boring on one end-face;

smoothly cylindrical electrode means lying on the member end-face opposite said boring and electrically and heat-conductively coupled with said member;

heating winding means mounted in said recess for generating a thermal condition for application to said body surface;

temperature measuring means mounted in said axial boring;

annular reference electrode means mounted concentrically with the electrode means;

a contact face of said reference electrode lying in a common plane with the end-face of the electrode means distal to said member;

an electrolyte film covering the contact face and the end-face of the electrode means;

membrane means covering said electrolyte film, adapted for body contact; and

lead means electrically coupled with said electrode means for deriving in vivo electrical signals indicative of the partial pressure of gas in blood.