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Electrochemical sensor and method for manufacturing

  • US 9,746,440 B2
  • Filed: 05/07/2015
  • Issued: 08/29/2017
  • Est. Priority Date: 08/30/2007
  • Status: Active Grant
First Claim
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1. A sensor for sensing an analyte in a sample comprising:

  • an outer member that is elongated along a longitudinal axis, the longitudinal axis extending between a distal end and a proximal end of the outer member, the distal end including an opening for allowing entrance of a test sample into the outer member;

    an elongated spacer positioned within the outer member, the elongated spacer having an axial length that extends along the longitudinal axis of the outer member;

    a first elongated electrode supported by the elongated spacer, the first elongated electrode defining a working electrode having a sensing layer; and

    a second elongated electrode supported by the elongated spacer, the second elongated electrode defining a counter electrode, a reference electrode, or a combined reference and counter electrode;

    the first and second elongated electrodes being elongated along axial lengths that extend along the axial length of the elongated spacer;

    the elongated spacer being sized and configured to separate the first elongated electrode from the second elongated electrode and to provide open space extending along the longitudinal axis between the outer member and the first and second elongated electrodes through which the test sample can flow, the sensing layer being accessible within the open space and having an axial dimension that extends along the axial length of the elongated spacer, wherein the elongated spacer, the outer member and the sensing layer are configured to enable the sensing layer to be progressively wetted along its axial dimension by the test sample as the test sample moves longitudinally through the open space from the distal end toward the proximal end of the outer member.

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