A medicament respiratory delivery device including a housing formed of
opposed thermoformed polymeric sheets bonded together having formed
therebetween a chamber having a medicament cartridge encapsulated between
the sheets, an inlet aligned with a passage through the cartridge having
a pierceable closure and an outlet aligned with the passage outlet having
a burstable membrane. The device includes a pressure actuator formed as a
blister between the sheets and a piercing element having a bow-shaped
actuator portion and a shaft which pierces the pierceable closure upon
actuation of the pressure actuator, delivering fluid under pressure to
the cartridge passage, rupturing the membrane and expressing the
medicament.