Patent ID: 8221335

Claim:
A blood test apparatus comprising: a housing with an opening; a plunger that moves back and forth inside the housing, the plunger having a projecting member; a fixing member configured to fix a position of the plunger, the fixing member being provided in the housing; a blood sampling cartridge, in which a blood sensor, a puncturer, and a holder that holds the blood sensor and the puncturer, are integrated, the blood sampling cartridge being removably attached to the opening, the puncturer including a lancet, one end of the lancet being held by the plunger, and a blood collection needle attached to an other end of the lancet; a measuring circuit that measures a signal obtained from the blood sensor to analyze components in the blood; and a slider provided in the housing, which is slidable in the housing and is urged toward the opening, wherein, when the blood sampling cartridge is attached to the opening of the housing, the projecting member of the plunger is engaged with the fixing member, such that the plunger is fixedly positioned by the fixing member, the blood sampling cartridge includes a fixing claw in the holder of the blood sampling cartridge, the fixing claw fixing a position of the lancet before the blood sampling cartridge is attached to the opening, and the fixing claw is pressed by the slider to release the lancet from the fixing claw, when the blood sampling cartridge is attached to the opening.