US Patent 9168337 Fluid injecting apparatus

A fluid injecting apparatus includes: a cartridge portion which has a tube that transports a fluid, a plurality of fingers that press the tube, and a blocking member that blocks the tube; and a main body portion which has a cam that presses the plurality of fingers. When the cartridge portion is detached from the main body portion, the blocking member blocks the tube. When the cartridge portion is mounted to the main body portion, the cam presses at least one of the fingers such that the tube is blocked at the position of the pressed finger and the blocking of the tube by the blocking member is released.