Patent ID: 8329114

Claim:
A drive assembly with collection chambers for sampling biological fluids comprising: a) a primary line having an inner cavity surrounded by a wall, said primary line comprising an an inlet end capable of receiving a biological fluid; b) a fluid reservoir; c) a waste container; d) a plurality of sample collection chambers; e) a peristaltic pump comprising a central rotor and a plurality of rotor housings, each capable of selective engagement with said central rotor, wherein each rotor housing comprises a sample collection line positioned along an inner perimeter and fluidly connected at one end to one of said plurality of collection chambers and at an opposing end to one of a plurality of needles, further wherein said engagement compresses said sample collection line against said central rotor and drives said needle into said inner cavity of said primary line; and f) a cam assembly comprising a rotatable earn, positionable along said plurality of rotor housings, wherein rotation of said cam in a first position selectively engages one of said rotor housings with said central rotor and rotation in a second position releases said rotor housing from engagement with said central rotor.