Patent ID: 7931643

Claim:
An infusion device for use in delivering drugs, the device comprising: a) a housing having a chamber, the housing having an outlet; b) a diaphragm operatively connected to the housing, the diaphragm dividing the chamber into a drug storage subchamber and a propellant subchamber, the diaphragm constructed from a shape memory alloy material, the diaphragm is configured to go over center for greater volume efficiencies; c) the propellant subchamber adapted and configured to receive a suitable propellant; d) the shape memory alloy selected for low bending stresses, wherein significant pressure changes are not imparted to the drug storage subchamber; and e) the drug storage subchamber adapted and configured to receive a suitable drug, the drug storage subchamber having an outlet in fluid communication with the outlet of the housing.