Patent ID: 6637432
Filing Date: 2003-10-28
Classification: A61M

Abstract:
A drug dispensing device actuated when a patient inhales from the device, comprised of(a) a first chamber for retaining a medication containing canister, the first chamber being in fluid communication with a mouthpiece through which a patient inhales a dose of a medication dispensed as an aerosol, an actuable means for acting on the canister causing dispensing of medication therefrom, said actuable means being in fluid communication with an openable and closeable first fluid pathway; (b) a second chamber including a compression piston hi to provide compression therein, the second chamber further including outlet means for providing fluid communication with the first fluid pathway; (c) a mouthpiece cover for protecting said mouthpiece wherein said mouthpiece cover is capable of rotating away from said mouthpiece; (d) a movable arm rotationally coupled at a first end to said mouthpiece cover and at a second end attached to the compression piston such that the compression piston is movable within said second chamber in response to movement of the movable arm in at least one direction causing compression of fluid therein; (e) sealing means for sealing the first said fluid pathway in a closed position; and (f) means for maintaining the sealing means in a closed position and for opening the sealing means when the differential pressure caused by the inhalation of the user exceeds a threshold value which causes said compressed fluid to act on said actuable means to displace said canister dispensing a close of medication to the user.