The invention relates to an optical arrangement provided for a spectral fanning out of a light beam, preferably the detection beam path of a confocal microscope, especially for the subsequent splitting of the fanned out beam out of the dispersion plane thereof. The carrier film and the textile material are bonded together over their entire surface in an edge region that extends along the edges of the laminate material element and has the shape of a frame. As medical fluid is supplied into the balloon, the balloon inflates to store the medical fluid therein.