Patent ID: 8277423

Claim:
A dosing device for an infusion system, the dosing device comprising a dosing unit having a variable volume; a supply opening operable to be open or closed, so as to enable a substance to be supplied to the variable volume through the supply opening only when the supply opening is open; and a dispensing opening operable to be open or closed, so as to enable the substance to be dispensed from the variable volume through the dispensing opening to a dispensing unit of the infusion system only when the dispensing opening is open, the dosing unit being operable only in a first state in which the supply opening is open and the dispensing opening is closed, in a second state in which the supply opening and the dispensing opening both are closed, or in a third state in which the supply opening is closed and the dispensing opening is open, wherein the dosing unit is operable to be rotated, displaced, or both, to select the first state, the second state, or the third state.