Seal for an inhalation device

An inhalation device for medically active liquids for generation of an aerosol, comprising:

• a housing;
• an impingement nozzle for generating the nebulised aerosol by collision of at least two liquid jets, the nozzle being firmly affixed to a user-facing side of the housing so as to be immobile relative to the housing;
• inside the housing the inhalation device comprises:
• a reservoir for storing a liquid;
• a pumping device with:
• a pumping chamber for generation of a pressure inside said pumping chamber which is moveable relative to the housing or to the nozzle, wherein the pumping chamber is fluidically connected with the reservoir;
• a riser pipe which can be received with at least one reservoir-facing, interior end in said pumping chamber, and said nozzle which is connected liquid-tight to an exterior end of the riser pipe that is immobile and firmly attached to the housing or to the nozzle, wherein the interior volume of the pumping chamber is changeable by means of relative motion of the pumping chamber to the riser pipe, wherein the pumping chamber is pushed onto the immobile riser pipe to increase the pressure and press the medically active liquid out of the nozzle;
• characterized in that a gap is present between an outside of said riser pipe and an inside of said pumping chamber, the gap being bridged by a seal for minimizing pressure loss when a pressure is generated inside said pumping chamber.