Patent ID: 9539400
Date: 2017-01-10
CPC Classifications: A61M

Claim:
1. A control circuit for a dry powder inhaler having an inhaling airflow passageway, having a vibrating mechanism provided proximate to the inhaling airflow passageway; a supply of a dry powder operatively coupled to the vibrating mechanism; a power source in communication with the vibrating mechanism; and a sensor in communication with the vibrating mechanism, wherein the sensor is positioned to measure a vibration of the vibrating mechanism; said control circuit comprising an actuation controller for permitting power to be supplied to the vibrating mechanism; a feedback control in communication with the sensor and the power source, whereby the feedback control controls power delivered to the vibrating mechanism based on a vibration measured by the sensor after the power delivered to the vibrating mechanism is removed upon the vibrating being driven to a steady state condition; and a frequency sweep generator connected between the power source and the vibrating mechanism for controlling a characteristic of power delivered to the vibrating mechanism whereby vibration of the vibrating mechanism releases powder directly into the inhaling airflow passageway.