Patent ID: 8516883

Claim:
A device for determining a fill level of an inflow-less flexible medicine reservoir as a source for medicine, the inflow-less flexible medicine reservoir having a monotonically decreasing fill level, comprising: an elastic wall and a rigid wall connected such that a volume intended to contain the medicine is formed; an outflow formed in the rigid wall for disbursement of the medicine; a stop surface designed and arranged such that the stop surface contacts the inflow-less flexible medicine reservoir while the inflow-less flexible medicine reservoir is filled above a predetermined level; a release detector that generates an output signal indicative of contact between the stop surface and the inflow-less flexible medicine reservoir being released; and a processing unit that determines the fill level of the inflow-less flexible medicine reservoir from an output signal of the release detector, wherein the processing unit takes into account information on an amount of medicine pumped from the inflow-less flexible medicine reservoir by a pump.