Patent ID: 7896264

Claim:
Microstructured nozzle comprising: an inlet for unfiltered fluid, an outlet for filtered fluid defining a flow direction, a main filter between the inlet and outlet, the main filter comprising a plurality of zigzag projections extending transversely to the flow direction from a base plate, defining a plurality of channels and forming spikes in directions of the inlet and the outlet, and a filtrate collecting chamber between the main filter and the outlet, the filtrate collecting chamber comprising a plurality of pillar-shaped built-in elements extending from the base plate transversely to the flow direction covering an area between the outlet and the main filter and at least part of an area extending between the zigzag projections directed towards the outlet, wherein one or more spacings between the built-in elements, each of which forms a throughflow channel for the liquid passing through, are such that a resulting cross sectional area transverse to the direction of flow which is effectively permeable to the liquid is greater than a corresponding effective cross sectional surface area of the throughflow channels formed by the projections of the main filter such that the built-in elements do not substantially increase a flow resistance.