The invention relates to a method, an apparatus and a system for the transfer of medical image data from at least one source application to at least one sink application, and for managing the data transfer via a controller and a message system. According to one embodiment, a wall system comprises a plurality of vertically displaced horizontal support members, and a wall panel having at least one inwardly-extending ridge. The method further includes identifying one or more of the data elements to which any of the dimension widening rules are applicable. Blades, rollers, vibrating elements, and other structures may be provided within or around the distal end of the aspiration lumen in order to dislodge and disrupt aspirated material which can seal against the opening. In addition, each of the control disks contains a subdivided outlet opening for the mixed water leaving the valve. The rolling bearing is formed as an elastic, flexible roller bearing, whose cylinder rollers have at least at one peripheral position an elastically deformable cylinder roller, having a diameter that is slightly greater than a diameter of the other cylinder rollers.