| abstract |
The present invention provides a drug delivery device comprising a drug reservoir chamber ( 15 ) containing a substance ( 16 ) to be delivered in fluid connection with a drug administration means ( 17 ) and ( 18 ), and a hydraulic control chamber ( 9 ) containing an electrically controlled, non-gassing, volume changing means ( 13 ), a coupling means ( 14 ) coupling said hydraulic control chamber ( 9 ) to said drug chamber ( 15 ), the arrangement being such that a change in the electrical control means ( 11 ) causes a change in the volume of the volume changing means ( 13 ), the volume change being conveyed by the coupling means ( 14 ) to the drug chamber ( 15 ) such that the substance ( 16 ) is expelled from the drug chamber ( 15 ) towards the drug administration means ( 17 ) and ( 18 ). |