abstract |
A drug delivery pump includes a dosing chamber for delivering a substance therefrom, pushing apparatus, and a thermal energy source arranged to cause a sufficient change in temperature in a portion of the pushing apparatus so that the pushing apparatus imparts a pushing force against the substance to cause the substance to be delivered from the dosing chamber. A controller controls delivery of the substance from the dosing chamber. A thermal insulator thermally insulates the substance in the dosing chamber from the thermal energy source. |