Importance

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Abstract

A pump system for an infusion system includes a linear drive (36, 36') which minimizes the space occupied by the pump components in a portable housing (10, 10'). A motor (34) and a motor drive shaft (42) are arranged in parallel with, and adjacent to a syringe (14, 14') and lead screw (94, 94'). A gear box (54) connects the drive shaft and lead screw to transfer rotational movements between them. A piston driving member, such as a cone (116) or drive nut (116') converts the rotational movement of the lead screw into linear motion of a syringe piston (24). Sensors (150, 152) detect when the piston or cone is in a 'home' position and in an 'end' position, respectively. Optionally, a proximity sensor (170) is used to ensure that the cone and the piston (24) are abutting during dispensing. Alternatively, a clamping member (350) selectively clamps the lead screw (94') against linear motion in at least a dispensing direction.

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First Claim