Inhalation device

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

• a housing, inside the housing a reservoir for storing a liquid, a pumping unit, said pumping unit comprising a riser pipe, a hollow cylindrical part having an interior space configured to receive an upstream end portion of said riser pipe, said cylindrical part being linearly moveable on the riser pipe, wherein the cylindrical part and the riser pipe form a pumping chamber having a variable volume for generation of a pressure inside said pumping chamber due to linear relative motion of the cylindrical part with respect to the riser pipe, wherein
• the pumping chamber is fluidically connected with the reservoir and with a nozzle which is connected liquid-tight to a downstream end portion of the riser pipe, and wherein
• said linear relative motion is configured to be caused by a relative rotation around a rotational axis of a rotatable part which is part of, or connected to, a first part of the housing with respect to a counterpart which is part of, or connected to, a second part of said housing with a gear mechanism configured to convert said relative rotation into said linear relative motion, said gear mechanism comprising at least one cam surface comprising, in an axial direction corresponding to a longitudinal axis of the pumping chamber, a first section of increasing height as well as a second section of decreasing height, the at least one cam surface configured to slide along an adjacent counterface, wherein the at least one cam surface is, during said relative rotation, configured to slide along said counterface, resulting in said conversion, and wherein
• a potential energy storage device is provided which is configured to be charged by said relative rotation along the first section, and wherein said energy is configured to be released to said pumping unit when released, and wherein the at least one cam surface comprises, between the first section of increasing height and the second section of decreasing height, a third section of constant height, such that, while said third section of the at least one cam surface slides along the counterface, no linear relative motion of the cylindrical part with respect to the riser pipe occurs, and wherein
• a dosing cycle which covers the rotation angle of the first, the second, and the third section, corresponds to a rotation of 180 degrees.