Aerosol actuator

A metered dose aerosol actuator for use in dispensing medicament from a pressurized medicament container having a valve stem at one end for dispensing the medicament and a closed end opposite the valve stem, the actuator comprising:

• a housing adapted to receive the container in an assembled position, the housing having a base and an open end opposite the base, the container in the assembled position being oriented with the valve stem proximate to the base and the closed end proximate to the open end so that when the housing is oriented in a use position with the open end facing upwardly, the container will be in an inverted orientation with the valve stem facing downwardly and the closed end facing upwardly;
• a stem block extending from the base of the housing toward the open end of the housing;
• a cavity in the stem block defining a mating surface that is adapted to engage the valve stem of the medicament container with the container in the assembled position;
• a spray orifice in the stem block in fluid communication with the cavity via an outlet channel;
• and
• a sump in the cavity extending from the outlet channel toward the base of the housing, the sump being molded in a continuous form and having a continuous smooth, rounded interior surface without angles or corners where the medicament being dispensed could accumulate or deposit.