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System and methods for blood glucose sensing

  • US 6,743,635 B2
  • Filed: 11/01/2002
  • Issued: 06/01/2004
  • Est. Priority Date: 04/25/2002
  • Status: Expired due to Term
First Claim
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1. A test strip for measuring glucose in a blood sample, said test strip comprising:

  • a first insulating sheet, said first insulating sheet having a proximal end and a distal end, said proximal end being narrower than said distal end;

    at least four electrodes disposed on said first insulating sheet, said at least four electrodes including a working electrode, a counter electrode, a fill-detect anode, and a fill-detect cathode;

    a plurality of electrical contacts disposed on said first insulating sheet, said plurality of electrical contacts including a working electrode contact, a counter electrode contact, a fill-detect anode contact, and a fill-detect cathode contact;

    a plurality of conductive traces disposed on said first insulating sheet, said plurality of conductive traces electrically connecting said working electrode to said working electrode contact, said counter electrode to said counter electrode contact, said fill-detect anode to said fill-detect anode contact, said fill-detect cathode to said fill-detect cathode contact;

    an auto-on conductor disposed on said first insulating sheet;

    a first dielectric layer disposed on said first insulating sheet, said first dielectric layer covering portions of said working electrode and said counter electrode, so as to define an exposed working electrode portion and an exposed counter electrode portion;

    a second dielectric layer disposed on said first dielectric layer, said second dielectric having a slot, said working electrode, said counter electrode, said fill-detect anode, and said fill-detect cathode being disposed in said slot, said slot having a proximal end and a distal end, said proximal end of said slot being aligned with said proximal end of said first insulating sheet;

    a reagent layer disposed in said slot, said reagent layer including glucose oxidase and a mediator;

    an adhesive layer disposed on said second dielectric layer, said adhesive layer having a break extending from said slot to a vent opening; and

    a second insulating sheet disposed on said adhesive layer, said second insulating sheet covering said slot and at least a portion of said break, said second insulating sheet having a proximal end and a distal end, said proximal end of said second insulating sheet being aligned with said proximal end of said slot, wherein said slot defines a sample chamber in said test strip, said slot being dimensioned to draw said blood sample in through said proximal end of said slot by capillary action.

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