The system has rails (31, 32) fastened to a ceiling (12) of a medical treatment room and defining curved paths. A shearing mechanism (667) moves a medical device (69) between an upper rest position (679) and a lower operating position (671). The shearing mechanism is moved along the paths defined by the rails. The medical device is formed as a part of a projection surface and a projector in which information is visibly represented to a medical personnel i.e. doctor, in the lower operating position. The projector projects representation of the information on the projection surface. The projection surface is formed as organic LED display and an LCD.
