Patent ID: 8337486

Claim:
A portable ambulatory therapeutic fluid dispensing device for infusing a therapeutic fluid into a body of a user and optionally for sensing an analyte within the body, the device comprising a device housing including a disposable part housing and a separate reusable part housing connectable to the disposable part housing; wherein the disposable part housing comprises: a reservoir for containing a therapeutic fluid; a source of energy to energize the device, the source of energy comprising at least one electrochemical cell configured to produce electrical energy upon exposure of the cell to air; and a seal to prevent exposure of the at least one cell to air when the source of energy is not in use and configured to expose the at least one cell to air prior to energizing the device; wherein the reusable part housing comprises: at least a portion of a driving mechanism; and a processor; wherein the device housing has at least one air vent opening configured to expose the source of energy to air, and a second seal to prevent entry of air into at least one of the disposable part housing and the reusable part housing through the at least one air vent opening when the device is not in operation; and wherein the device is operable upon connecting the disposable part housing and the reusable part housing such that the source of energy is exposed to air through the vent and electrical connectivity occurs between the source of energy and the at least a portion of the driving mechanism and the processor.