| abstract |
Disclosed is a drug delivery device configured to provide a drug dosage. The drug delivery device includes a main housing, a syringe arranged in the main housing, and a pneumatic power pack arranged in the main housing. The pneumatic power pack includes a pressurized gas supply source for storing a pressurized gas, a valve for a pressurized gas supply source, a sleeve having an inner wall, and a plunger. The sleeve is configured to receive pressurized gas discharged from a pressurized gas source. The plunger slides airtightly against the inner wall of the sleeve. In operation of the valve, the valve discharges the pressurized gas, the released pressurized gas flows into the sleeve, and propels the plunger toward the sleeve and the syringe in the distal direction to withdraw the drug from the syringe. |