Patent ID: 6312409
Filing Date: 2001-11-06
Classification: A61M

Abstract:
A device for generating a pulsatile drug flow, comprising:a housing containing an expandable/contractible chamber having an inlet and an outlet,a valve, associated with the outlet, the valve being actuated by a bistable actuating member lied to the displacement member, the bistable actuating member acts on the valve to open and close the valve as tie bistable actuating member moves between its bistable configurations, and the valve being shaped to allow the bistable actuating member to undergo an initial deformation or movement without actuating the valve such that an actuation of the valve only occurs when the actuating member undergoes the full transition between its bistable configurations;a displacement member that through its displacement controls the expansion and contraction of the chamber and the actuation of the valve; anda resilient member for biasing the chamber to its contracted state such that when the inlet is connected to a pressurised fluid drug supply the chamber is expanded by the drug, the expansion of the chamber actuating the valve to open, thereby allowing a release of drug from the chamber and enabling the contraction of the chamber under the influence of the resilient member, this contraction in turn actuating the valve to close thereby allowing the chamber to refill.