The present respiratory treatment device comprising a self-sensing respiratory treatment device comprising: power supply means (4, 24, 34)； a liquid dispensing element (9, 29, 39) comprising an actuator (11, 211, 311) and a dispensing aperture (10, 210, 310) through which liquid is to be dispensed by activation of the actuator； electronic control means (6, 26, 33) operable to control said actuator； liquid supply means (8, 18, 28) for connecting with a liquid reservoir (1, 21, 31) to supply liquid from said reservoir to said liquid dispensing element； valving means (7, 27, 37, 47) for allowing or blocking liquid to flow from said reservoir through said liquid supply means to said liquid dispensing element； wherein said actuator is operable to execute in itself at least a dispensing function and a detecting function, the detecting function detecting at least characteristics external to the self-sensing respiratory treatment device and causing said actuator to generate a command signal, and wherein said electronic control means is operable to control said valving means and said actuator based on the reception of said command signal, wherein said actuator is a piezoelectric actuator, and the Respiratory treatment device further comprising: a mouthpiece, and a fluidic interface, wherein said electronic control means and said piezoelectric actuator being arranged to detect a breathing pattern of a user through said mouthpiece.
