Microstructured filter

A nebulizer for inhalation therapy, the nebulizer comprising a microstructured filter having an inlet for unfiltered fluid and an outlet for filtered fluid, the filter comprising:

• a substantially flat base plate and a cover plate that is securable thereto;
• and
• a plurality of projections that each comprise an integral component of the base plate and which each project therefrom, the projections being spaced from one another by passages that form a fluid path through the filter from the inlet to the outlet, the cover plate when secured to the base plate covering the projections and the passages;
• wherein the plurality of projections are arranged in at least two rows to extend in a zig-zag configuration and in a mutually juxtaposed relationship across the filter.