Breath activated medication spray

An inhalation device for dispensing a medicament to a patient from a metered dosage cartridge, comprising:

• a housing adapted to be held by hand;
• said housing having a mouthpiece and a connecting passageway communicating with said mouthpiece for ambient air to be inhaled by said patient;
• triggering means supported by said housing, said housing including recess means for receiving said metered dosage cartridge between said triggering means and said housing, said triggering means being movable to a first position for moving said cartridge to a non-operative position and to a second position for permitting said cartridge to move to an operative position;
• biasing means in said housing for biasing said cartridge against said triggering means and for moving the cartridge to said operating position upon activation of said triggering means;
• and
• battery powered circuit means positioned in said housing including switch means positioned in association with said passageway and solenoid means secured to said housing for activating said triggering means;
• the cartridge including pin means communicating with said passageway for releasing said medicament from the cartridge to said passageway upon activation of said triggering means;
• said switch means being for closing said circuit and thus activating said solenoid means and thereupon activating said triggering means from said first to said second position thereby causing said biasing means to move said cartridge to said operating position thus dispensing a metered amount of said dosage into said passageway from the cartridge, said switch means being activated by a decrease in pressure in said passageway generated by the inhaling action of said patient.