A sense amplifier inverts the output from the pass transistor to control a pre-charge transistor. The universal valve may be open or closed by the use of a squeeze mechanism for patient control, or by movement of the threaded connection between the universal valve and a collection bag so that the universal valve is continuously open for drainage into the urine collection bag. One or more electrical contact elements are disposed on the substrate support. The form of the collar is such that it has defined deformation regions, with the result that the collar can expand and thus widen in the event of a force effect in the radial direction. The third optical raster element, which can be a diffractive optical element, introduces an additional degree of design freedom for the modification of the angular distribution of the projection light bundle. This being, it is provided that the emulsifying agent composition comprises at least one lecithin and at least one sugar ester of fatty acids as well as an emulsifying agent composition for the emulsion.