Patent ID: 8375941

Claim:
A method of operating a dry powder inhaler to expel inhalable medicaments to a user, comprising: slidably advancing a plurality of sealed substantially rigid microcartridges in a channel having a single unit width with sidewalls and at least some of the microcartridges snugly abut during the slidably advancing, each having a first dry powder, along a first spiral shaped travel path so that at least some of the respective microcartridges travel greater than one revolution in a first level of the inhaler, wherein at least some of the microcartridges travel greater than two revolutions in a first level of travel lanes before slidably advancing to a second level of the inhaler that resides above or below the first level; then directing the microcartridges to serially travel to an inhalation chamber from the second level after traveling greater than one revolution in the first level; and opening at least one microcartridge in or proximate to the inhalation chamber to thereby allow the dry powder iri the respective opened microcartridge in the inhalation chamber to be inhaled by a user.