INHALER

摘要

A dry powder inhaler for administering a dose of a medicament comprises a reservoir holding the medicament, an air channel assembly engaged with, and movable relatively to, the reservoir for receiving the dose of medicament upon said relative motion, and a counter for counting a number of doses dispensed from the reservoir or that can still be delivered before the inhaler is considered empty. The counter comprises a first indicator member which moves one increment in response to said relative motion, and a second indicator member which moves intermittently in response to motion of the first indicator member. A rotatory intermittent drive transfer mechanism is positioned between and engageable with the first and second indicator members. The first indicator member drives the rotatory intermittent drive transfer mechanism. The rotatory intermittent drive transfer mechanism drives the second indicator member intermittently upon motion of the first indicator member. The first and second indicator members have indicia thereon for displaying the number of doses dispensed from the reservoir or that can still be delivered before the inhaler is considered empty.