Patent ID: 8920376

Claim:
A drug pump device comprising: an electrolysis pump chamber formed in an enclosure comprising an expandable portion, generation of gas within the electrolysis pump chamber creating pressure to thereby expand the expandable portion; a secondary pump chamber located adjacent the electrolysis pump chamber and connected therewith by a fluid path, an upper surface of the secondary pump chamber being formed by a flexible diaphragm; a drug reservoir formed between the flexible diaphragm and a dome disposed thereabove; and a valve in the fluid path, the valve having a closed state that prevents fluid communication between the electrolysis and secondary pump chambers, thereby facilitating pressure buildup in the electrolysis pump chamber, and an open state that allows electrolyte liquid communication between the electrolysis and secondary pump chambers so as to facilitate release of pressure from the electrolysis pump chamber to the secondary pump chamber, thereby causing drug to be expelled from the reservoir.