Patent ID: 7856975

Claim:
An inhaler, comprising: an inhalation flow path having a suction port and an air intake opening, said inhalation flow path being constructed such that air is introduced from the air intake opening when a user starts inhalation via the suction port; a liquid medicine storage section for storing the liquid medicine; an ejection head, which communicates with the liquid medicine storage section, for ejecting the liquid medicine from an ejection opening into the inhalation flow path in a form of liquid droplets, the ejection head ejecting the liquid medicine by using at least one of heat energy and piezoelectric energy; a sensor capable of measuring a pressure difference between the inhalation flow path and the liquid storage section; a pressure changer for increasing and decreasing pressure in the liquid medicine storage section; and a controller for controlling the pressure changer so as to maintain the pressure difference measured by the sensor within a predetermined range before, during and after the inhalation.