| 摘要 |
The present invention relates to a multiple-dose powder inhaler for dispensing powdered medicament by inhalation comprising an inhaler body (3) defining a medicament container (8) for receiving a plurality of powdered medicament doses; an air channel (13) through which air is drawn via a mouthpiece (4); a metering drum (2) rotatable about its rotational axis and having one or more peripheral dosing recesses (10) for receiving in one position a metered dose of the powdered medicament from the medicament container (8) and for bringing in another position the metered dose of the powdered medicament to the air channel (13); and a dose counter for indicating the number of metered doses of medicament that have been dispensed from, or remain in, the medicament container (8). Said dose counter comprising a counter wheel (1) having a central hole (17) said counter wheel (1) being rotatably mounted about a bearing axle (18) having a longitudinal axis substantially parallel to and spaced from the rotational axis of the metering drum (2), said bearing axle (18) extending from the inhaler body (3) and through the central hole (17). Said counter wheel (1) having counting indicia thereon and a plurality of gear teeth (25) extending from the metering drum (2) a driving pin (31) adapted to engage with at least one of said plurality of gear teeth (25) of the counter wheel (1) upon every complete revolution of the metering drum (2) so as to rotate said counter wheel (1) an incremental amount; and a flexible brake finger (33) extending from the inhaler body (3) and adapted to engage with the counter wheel (1) so as to maintain a unidirectional rotation and to prevent unintentional movement of the counter wheel (1). |
