Selected dose pharmaceutical dispenser.

摘要: A dispenser (2) includes a body (4), needle (110) and one or more hollow cylinders (28) pistons (144). The is movable between predelivery position delivery position, at which the inner end (112) opens ball check valve (142) to permit free fluid flow from cylinder, along path (46) through needle. threaded dose adjuster (164, 166) mounted within engages stem (150). prevented rotating so that rotation of in direction causes move axially away piston compress drive spring (176) preload stem. Moving assembly pressurized pharmaceutical be automatically driven cylinder can refilled by user opening (88, 92, 94) supplemental pathway (54, 52) opposite direction.