Patent ID: 7246615
Filing Date: 2007-07-24
Classification: A61M,B05B,F15C

Abstract:
1. A spray generating device comprising: (a) a reservoir configured to hold a medicament; (b) a pump, having a piston, a spring and a cylinder, wherein the piston has a retracted position and a deployed position; (c) a pressure chamber, wherein a metered dose of the medicament is drawn from the reservoir into the pressure chamber by movement of the piston to the retracted position and held at ambient pressure in the pressure chamber until discharged, such that when discharge is required, the piston moves from the retracted position to the deployed position by virtue of the spring driving the piston forward and applying a rapid pressure rise to the metered dose of medicament to thereby cause the medicament to discharge from the spray generating device; and (d) a nozzle assembly, wherein the nozzle assembly atomizes the discharge fluid to form a spray having droplets suitable for inhalation, said nozzle assembly comprising: