Delivery devices

Abstract

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.