Abstract: The invention relates to a device and a method for determining sleep profiles. The aim of the invention is to develop a device and a method which automatically generate a sleep stage classification with a grading of approximately 85% (measured according to the crosscorrelation function between automatically and manually generated sleep profiles) with negligible discomfort to the sleeper caused by additional technical equipment in his or her ordinary environment. The inventive device is characterized in that an electrode strip with a preamplifier (active electrode) working on the basis of a single frontal EEG channel is placed symmetrical to the nose root and is connected to a measuring and analysis unit controlled by a microprocessor and working autonomously.

Abstract: A bundle of hollow fibers of uniform diameter, particularly for use in dialysis is formed of a plurality of parallel hollow fibres at least a part of which, prior to the formation of the bundle, is permanently undulated by means of interleaved undulating elements moving opposite the feeding direction of freshly extruded fibres. The undulating elements are in the form of cylindrical rods having a substantially larger diameter than the outer diameter of the fibres so that the wavelength and amplitude of the resulting undulations are substantially larger than the outer diameter of the fibres.

Abstract: Disclosed is a method of and a device for producing bundles of hollow fibers such as used for dialysis. The device includes a guiding device for a continuous fiber which rotates in a plane. At least two groups of take-up elements are mounted on a conveyor. The conveyor is intermittently activated so that a group of take-up elements is placed in a working position in the range of movement of the guiding device, and a strand of a desired thickness is wound around the take-up elements. Thereafter, the conveyor is activated to discharge the first group together with the completed strand from the working position and place the subsequent empty group of take-up elements in the working position, without interruption of movement of the guiding device. During the winding-up of the subsequent strand, the completed strand is cut and wrapped into bundles.