Inhalation device and method

An inhalation device for delivering a nebulized medically active aerosol for inhalation therapy, the inhalation device comprising:

• a housing configured to receive a fluid reservoir therein;
• an impingement-type nozzle fixed to the housing;
• an outlet valve configured to prevent backflow;
• and
• a pumping unit located in the housing, the pumping unit comprising:
• a riser pipe that is immovably fixed to the housing and in fluid communication with the impingement-type nozzle;
• and
• a hollow cylinder with the riser pipe at least partially inserted into an interior of the hollow cylinder, the hollow cylinder longitudinally translatable along an outer circumference of the riser pipe and configured to be in fluid communication with the fluid reservoir,
• an internal space of the riser pipe and hollow cylinder defining a variable volume of the pumping unit, the variable volume of the pumping unit variably based on a longitudinally translational position of the hollow cylinder along the outer circumference of the riser pipe;
• and
• a spring mechanically coupled to the hollow cylinder, the spring configured to vary the variable volume of the pumping unit by changing the longitudinally translational position of the hollow cylinder along the outer circumference of the riser pipe.