A Dry Powder Inhaler

Abstract: The present invention relates to a breath actuated dry powder inhaler wherein a breath actuated mechanism comprises a flap (11) movable from a substantially closed position to a substantially open position and a bistable biasing spring (10) holding the flap in the substantially closed position. The breath actuated mechanism is primed by rotation of a mouthpiece cover (17) from a substantially closed to a substantially open position such that on inhalation breath induced low pressure overcomes the bistable biasing spring to allow opening of the flap wherein the bistable spring acts to move the flap to the open. During the flap travel from the closed to the open position the movement of the flap forces a latch (21) retaining an energized dose opening mechanism to be disengaged thereby triggering dose opening by the piercer blade (3) wherein the dose opening mechanism is energized by the opening of the mouthpiece cover and is held in a latched position until disengaged by movement of the flap. The piercer blade which cuts a slit in the sealed foil packet moves through a lower foil the dose pocket and an upper foil.

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