Medicine ejection device and controlling method thereof

Abstract

The invention provides a medicine ejection device which provides stable ejection even when a reservoir with high sealability is used and can eject an appropriate amount of medicine. A medicine ejection portion 1 includes an ejection nozzle 1a and an element 1b which generates energy for ejecting the medicine, and is connected to a medicine storing portion 2. The medicine storing portion 2 is blocked from the outside air except a path through the ejection nozzle 1a, so that when the medicine is ejected from the ejection nozzle 1a, a pressure difference is formed between the outside and the inside of the medicine storing portion 2. A pressure unit 3 which is a feature of the present invention pressurizes a movable wall 5 when ejecting a medicine, which is displaced so that the volumetric capacity of the medicine storing portion 2 decreases due to the pressure difference.

Description

technical field

[0001] The present invention relates to a medicine ejection device configured to allow a user to carry and use it, and to be used in an inhaler for causing the user to inhale medicine, and a control method thereof. Background technique

[0002] An inhaler that uses the ejection principle of an inkjet system to eject microdroplets of medicine into an airflow path through which air inhaled through a mouthpiece flows and inhales the user (refer to Japanese Patent Application Laid-Open No. 2004 -290593 and Japanese Patent Application Laid-Open No. 2004-283245). The advantage of such an inhaler is the ability to precisely eject a prescribed amount of medication with a uniform particle size.

[0003] The basic configuration of such a drug ejection device includes an ejection head in which an ejection energy generating element such as a heat exothermic element is arranged, and a reservoir in which a drug to be supplied to the ejection head is stored. When the rese...

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