CANISTER-SUPPORTED ROTATING RING COUNT READOUT ASSEMBLY FOR A METERED DOSE INHALER

摘要

A dose counter assembly for use with an inhaler having a housing disposed about a longitudinal axis and a canister extending along a central axis. The canister is adapted to be received within the housing, whereby the central axis is substantially coaxial with the longitudinal axis and the canister is reciprocally moveable along said longitudinal axis of the housing. The dose counter assembly comprises a first ring rotatably mounted on the canister and having ratchet teeth thereon, a second ring rotatably mounted on the canister and having ratchet teeth thereon, activating means mounted on an outer surface of the first ring ,an inner surface of the housing, and a lever for operatively coupling the first ring so as to rotate the first ring in response to the movement of the canister along the longitudinal axis of the housing, and engaging means for operatively coupling the first ring with the ratchet teeth of the second ring so as to rotate the second ring in response to a predetermined amount of rotation of the first ring.