Patent ID: 7784460

Claim:
A breath-actuated delivery device, comprising: a delivery unit which is actuatable to deliver substance on application of a delivery force thereto; a loading unit which is actuatable to apply the delivery force to the delivery unit to actuate the same; a mouthpiece through which a subject in use exhales; an air channel which is in fluid communication with the mouthpiece; and an actuating member which is disposed in the air channel, the actuating member comprising a flexible, bi-stable element which is actuatable, on exhalation by the subject into the mouthpiece, between a first, non-actuated state and a second, actuated state in which the actuating member actuates the loading unit to apply the delivery force to the delivery unit to actuate the same, wherein the loading unit comprises a drive member which is actuatable from a loaded position to actuate the delivery unit, a biasing element for loading the drive member with the delivery force, and a restraining member for normally restraining the drive member in the loaded position and being configured to be released on actuation of the actuating member to the actuated state, such as to cause the biasing element to drive the drive member to actuate the delivery unit; and wherein the restraining member comprises a tether which is broken on actuation of the actuating member.