Flow governors for use in medicinal inhalers

A flow governor for use in a medicinal inhaler, the flow governor comprising:

• a tubular element that defines at least a portion of an air flow path, the tubular element comprising at least one flexible wall configured to flex inwardly in response to an air flow in the air flow path;
• and
• an internal support structure, located within the tubular element and configured to preserve at least a predetermined cross-sectional area of the air flow path within the tubular element when the at least one flexible wall of the tubular element flexes inwardly, wherein the internal support structure includes a hollow pillar defining a lumen therein, and further wherein the predetermined cross-sectional area of the air flow path includes a cross-sectional area of space between the tubular element and the internal support structure.