Patent ID: 8851069
Filing Date: 2014-10-07
Classification: A61M

Abstract:
1. A dry powder inhaler comprising an airway along which, in use, air is drawn from an upstream, inlet end to a downstream, outlet end, the airway including a medicament presentation region at which, in use, a dose of medicament is presented to the airway, the medicament presentation region having a primary air inlet, and a barrel extending from the medicament presentation region to an outlet end of the airway, an inlet end of the barrel being of reduced internal dimension relative to the medicament presentation region and relative to the outlet end of the airway, such that the inlet end of the barrel constitutes a constriction of the airway; wherein the medicament presentation region is further provided with at least one secondary air inlet from which, in use, air enters the medicament presentation region in a direction that is substantially orthogonal to a flow of air into the medicament presentation region from the primary air inlet and to a direction of flow of air along said barrel, such that the air flows from the primary and secondary air inlets meet within the medicament presentation region, at which point the air flow from the secondary air inlet has a component of motion that is orthogonal to the air flow from the primary air inlet; wherein a ratio of the cross-sectional areas of the primary and secondary air inlets is between 5:1 and 2:1.