DELIVERY DEVICES
A breath-actuated delivery device includes a mouthpiece through which a subject in use exhales, an air channel which is in fluid communication with the mouthpiece, and a flexible diaphragm which is disposed in the air channel. The diaphragm provides for at least a restricted air flow through the air channel until a predeterminable actuation pressure is developed in the mouthpiece, and, on generation of the predeterminable actuation pressure in the mouthpiece, provides for an air flow through the air channel.
1 - 66 . (canceled)
67 . A breath-actuated delivery device, comprising:
a mouthpiece through which a subject in use exhales;
an air channel which is in fluid communication with the mouthpiece; and
a flexible diaphragm which is disposed in the air channel, the diaphragm providing for at least a restricted air flow through the air channel until a predeterminable actuation pressure is developed in the mouthpiece, and, on generation of the predeterminable actuation pressure in the mouthpiece, providing for an air flow through the air channel.
68 . The delivery device of claim 67 , wherein the diaphragm at least substantially closes the air channel until the predeterminable actuation pressure is developed in the mouthpiece.
69 . The delivery device of claim 68 , wherein the diaphragm closes the air channel until the predeterminable actuation pressure is developed in the mouthpiece.
70 . The delivery device of claim 67 , further comprising:
a rupturing element for rupturing the diaphragm on generation of the predeterminable actuation pressure in the mouthpiece.
71 . The delivery device of claim 67 , wherein the diaphragm is a resilient element.
72 . The delivery device of claim 67 , wherein the delivery device is a nasal delivery device, and further comprising:
a nosepiece for fitting to a nostril of the subject and through which substance is delivered to the nasal airway of the subject.
73 . The delivery device of claim 72 , wherein the nosepiece is in fluid communication with the air channel, and an air flow, when delivered through the air channel, acts to entrain substance.