An aerosol medicament delivery adapter (20) comprises a first conduit (22), second conduit (24) and a diverter element (26). The first conduit (22) encloses a flow path chamber (28) and extends between an upstream first end (34) and a downstream second end (36). The second conduit (24) comprises an aerosol medicament delivery conduit that includes an upstream first end (48) adapted to be fluidly coupled to a particle generator (14), and a downstream second end (50) fluidly coupled to the first conduit at a Y-junction (54) proximate the upstream first end of the first conduit. The diverter element (26) comprises a flow diverter chamber (60) disposed within the first conduit (22) or the second conduit (24). The cylindrical flow diverter chamber (60) includes a transitional flow cross-section (62) and a principal axis (64), extending between a first end (66) and a second end (68) thereof. The diverter element creates flow eddies for enhancing an entrainment of aerosol particles, delivered via the second conduit, within a pressurized gas flow along the flow path within the first conduit.
