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US 6,179,583 B2Granted
Metered fluid delivery device
AssigneeWeston Medical Limited
InventorTerence Edward Weston
Life of this patent
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AssigneeWeston Medical Limited
InventorTerence Edward Weston
Estimating the term…
A metering device for pressurized fluids has a rotor containing an oscillating free piston operating in a bore at right angles to the rotor axis. The piston is driven by the fluid to be metered. The rotor is retained within a stator having inlet and outlet ports. When the rotor is rotated, a first end of the bore becomes in fluid connection with the inlet port and the piston is operated upon by the pressurized fluid and moves within the bore in a first direction towards the outlet port. As the rotor is turned further, the second end of the bore becomes in fluid connection with the inlet port whilst the first end is made in fluid connection with the outlet port, and the piston reverses to move in a second direction, i.e. towards the outlet port to discharge the fluid which had previously moved the piston in a first direction. The rotor may be turned back and forth to dispense metered doses of the fluid, or may be rotated continuously or intermittently in the same direction to dispense metered doses of the fluid.
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.
A medical infusion device comprising a fluid inlet for connection to a source of infusion fluid;
Dependencies are inferred from the claim text.