abstract |
A drug delivery pump comprising a dosing chamber (16) for delivering a substance (18) therefrom, a propulsion device and a thermal energy source (14) arranged to cause a sufficient change in temperature in a part of the propulsion device, The pushing device thus exerts a pushing force on the substance to transport the substance from the metering chamber. A controller (90) controls the delivery of substance from the metering chamber. A thermal insulator (24) thermally insulates the substance in the metering chamber from the source of thermal energy. |