Portable controlled release osmotic infusion device

Abstract From the Canadian patent

A portable controlled release osmotic infusion device which can be activated on demand by the user comprising a rigid housing containing: (a). a fluid-imbibing assembly, comprising a solvent-containing chamber and a solute-containing chamber; the two chambers separated by a rigid semipermeable membrane covered by a thin taut foil seal, (b). a drug-containing chamber separated from the fluid-imbibing assembly by a leakproof impermeable elastic diaphragm, which expands into the drug-containing chamber in use and drives the drug through a dispensing orifice at a steady rate and, (c). an activating device which ruptures the foil seal described in (a) above and initiates the osmotic action of …