Patent ID: 6997343

Claim:
A cartridge assembly for use in a test device for testing of analyte concentration in a fluid to be applied thereto, the cartridge assembly comprising: a) a housing having a plurality of sensors arranged in a stack therein, each sensor carrying reagent means for producing a signal in response to the concentration of analyte in an applied fluid; b) the housing having an opening of sufficient dimensions to permit a sensor to pass through the opening; c) a stop member located beyond the opening which limits outward travel of sensors from the stack; d) a spring means which urges the sensors towards and into contact with the stop member; e) a fixed gap between the stop member and the said opening of suitable dimensions to permit a sensor to be pushed through the said gap; and f) at least one sealing surface on or around the housing for making a moisture-tight seal with a suitable sealing member so as to protect sensors in the housing from atmospheric moisture; g) wherein the housing comprises a cartridge inner member; and h) wherein the cartridge assembly further comprises a cartridge outer member in which the cartridge inner member is located, the sealing surface being provided around the periphery of the cartridge outer member.