Drug-delivery pump with intelligent control

A drug pump device comprising:

• a drug reservoir containing a fluid;
• an exit member for fluidically connecting the reservoir with a drug injection site;
• a sensor;
• an electrolysis pump comprising a pump chamber in mechanical communication with the drug reservoir via an intervening displacement member, the electrolysis pump being operable to exert a pressure to drive the intervening displacement member toward the exit member and thereby force therethrough the fluid in the drug reservoir;
• and
• control circuitry for (i) storing one or more delivery parameters and target values therefor, (ii) operating the electrolysis pump in a priming stage to force a volume of the fluid from the drug reservoir into the exit member but substantially before any delivery of fluid from the exit member, (iii) based on signals received from the sensor during the priming stage before substantially any delivery of fluid from the exit member, determining a deviation between a target value of one or more delivery parameters and a measured value thereof for delivery of a target volume of fluid, and (iv) based at least in part on the determined deviation, operating the pump in a delivery stage to force the target volume of fluid from the drug reservoir out through the exit member.