Patent ID: 6616819
Filing Date: 2003-09-09
Classification: G01N,Y10S

Abstract:
An electrochemical sensor strip for determining a concentration of glucose in blood or interstitial fluid, the sensor comprising:a first substrate having a first major surface and a second major surface opposing the first major surface, the first substrate defining a proximal end of the strip, a distal end of the strip and first and second side edges of the strip extending from the proximal end to the distal end; a second substrate having a first major surface and a second major surface opposing the first major surface, the first and second substrates being disposed so that the first major surface of the first substrate is in facing relationship with the first major surface of the second substrate; spacer material disposed between the first substrate and the second substrate, the spacer material, the first substrate and the second substrate further defining: a first aperture along the proximal end and between the substrates, a second aperture along the first side edge and between the substrates, a channel leading from the first aperture to the second aperture, and a sample chamber adjacent the first aperture and along the channel, the sample chamber comprising a measurement zone having a volume of no more than 1 &mgr;L; a working electrode disposed on the first major surface of the first substrate; a glucose responsive enzyme disposed on the working electrode; a counter electrode disposed on the first major surface of one of the first substrate and the second substrate, the working electrode and the counter electrode being positioned relative to the sample chamber to generate a glucose responsive signal when sample containing glucose is disposed in the measurement zone; and an insertion monitor disposed on one of the first and the second major surfaces of one of the first substrate and the second substrate, the insertion monitor including a conductive stripe extending across a width of the sensor strip and the insertion monitor providing a path for electrical current between at least two contact leads of a meter.