Patent ID: 6179583
Filing Date: 2001-01-30
Classification: A61M,G01F

Abstract:
A fluid metering device which comprises a stator, have an internal wall defining a cavity therein, a rotor mounted in said cavity, and defining, with said internal wall, at least and a first and a second fluid chamber, a bore extending through the rotor from the first fluid chamber to the second fluid chamber, a piston movable along the bore and defining first and second bore regions on either side thereof, a fluid inlet port for supplying fluid to the cavity, a fluid outlet port for receiving fluid from the cavity, the rotor being rotatable with respect to the stator about an axis of rotation between a first position in which the fluid inlet port communicates via the first chamber with the first bore region and the fluid outlet port communicates via the second chamber with the second bore region, and a second position in which the fluid inlet port communicates via the second chamber with the second bore region and the fluid outlet port communicates via the first chamber with the first bore region, said device further comprising stop means for limiting the extent of range of the piston along the bore.