Method for producing a unit having a three-dimensional surface patterning, and use of this method

A method for producing a unit having a three-dimensional surface patterning on a base layer. A photoresist is applied to a base layer and subjected to a masked exposure matched to a predetermined final surface patterning. Parts of the photoresist layer are removed by developing to provide an initial surface patterning, including photoresist sacrificial subregions. A coating which covers the initial surface patterning is then applied. Energy is then applied to the initial surface patterning to destabilize the sacrificial layer regions. The initial surface patterning is acted on by a high-pressure liquid jet at a predetermined treatment temperature such that at least part of the coating which covers the sacrificial layer regions are mechanically removed or at least broken open to produce the final surface patterning. The liquid has a negligible chemical reaction rate and/or physical dissolution rate with respect to materials of the unit and/or organic fluid-sealing means.