Inhalation counter

Abstract

An inhalation counter (350, 450, 550) for an inhalation system (100) is provided. The inhalation system comprises a fluid flow passage (322) and the inhalation counter comprises an escapement wheel (352, 452), a biasing means (354, 454) for incrementing the escapement wheel, a conversion mechanism which, in use, is configured to perform a first action in response to a temporary increase in fluid flow rate through the fluid flow passage, and an anchor (356, 456). The anchor is coupled to the conversion mechanism and configured to interact with the escapement wheel so as to allow the biasing means to increment the escapement wheel in response to the first action of the conversion mechanism. A holder (300) and an inhalation system comprising the inhalation counter are also provided.