Counter structure of dry powder aerosol delivery system

A counter structure of a dry powder aerosol delivery system, comprising a housing of a dry powder aerosol delivery system, wherein:

• a knob is arranged at an end of a housing;
• a counting disc, a transmission gear, a counting disc cover, a spring, a vibration gear and a rotating disc are arranged in the housing;
• the housing, the knob, the counting disc, the counting disc cover, the spring, the vibration gear and the rotating disc are arranged coaxially;
• the counting disc, the counting disc cover, the spring and the vibration gear are disposed around a straight rod of the rotating disc;
• an outer gear meshed with the transmission gear is arranged on a periphery of the straight rod;
• a counter window is formed on a front surface of the knob to allow a patient to see readings and obtain used inhalation times or available remaining inhalation times;
• a counter function is realized on the knob of the counter structure, such that doses are be distributed by means of the knob, and the remaining doses are counted and displayed.