Patent ID: 9333297
Filing Date: 2016-05-10
CPC Classification: A61M,G16H

Claim Text:
1. A drug pump device comprising: a drug reservoir; 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 displacement member toward the exit member and thereby force therethrough fluid in the drug chamber; and control circuitry for (i) storing a target delivered volume over a specified time, (ii) operating the electrolysis pump to force fluid from the drug reservoir into the exit member in pulses having a time window defined by a pump-start time when pumping begins and a pump-stop time when the pump is shut off, the time window corresponding to the target delivered volume at a predetermined flow rate, (iii) based on signals received from the sensor, measuring a volume of fluid through the exit member resulting from a pulse, the measured volume including a pulse volume through the exit member during the pulse and an additional tail volume through the exit member after the pulse, and (iv) adjusting the pulse time window based on the measured pulse volume and tail volume to conform collectively to the target delivered volume.