In a device for biological fluid treatment, fluid is led along surfaces coated with microorganisms, which form parts of disks drivable about a rotation axis. The component is controlled based on the measured morphological characteristic and the current position of the seat. By storing contraindication information with the implant’s remote controller, patient and clinician can more easily determine the safety of a particular therapeutic or diagnostic technique or physical activity with the patient’s implant, perhaps without the need to contact the manufacturer’s service representative. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. Thereby this invention can preserve a green power.