Patent ID: 8602022

Claim:
A medicine ejection device comprising: a medicine ejection section including ejection nozzles and an element that generates energy for ejecting medicine from said ejection nozzles; a medicine container section that is coupled to said medicine ejection section and contains the medicine, said medicine container section including a container body and a movable wall, and wherein said movable wall moves in relation to said container body so that a capacity of said medicine container section can change in accordance with a predetermined pressure difference between the inside and outside of said medicine container section; and a pressure control unit configured to generate pressure variations in a negative pressure direction inside said the medicine container section, wherein said pressure control unit applies a force on said movable wall before ejection of the medicine from said ejection nozzles and releases the force from said movable wall when ejecting the medicine, the force being more than a maximum static friction between said container body and said movable wall of said medicine container section.