1. A device for positioning and fixing sensors on the scalp of a patient, comprising an outer layer (4) attached to the inner layer (3), from which it is partially separated by the middle layer (2), the outer layer (4) consisting of a rigid material, impermeable to fluid, characterized in that the inner layer (3) is made of an elastic material, impervious to the fluid and having areas for accommodating sensors or electrodes, the inner layer (3) is directly attached to the outer layer (4) only in its own way For example, the middle layer (2) contains a fluid that can be used in combination with a material capable of uniformly compressing or expanding over its entire surface by regulating the pressure of the specified fluid, the device contains means for regulating the pressure of the fluid in the middle layer (2). 2. A device according to claim 1, characterized in that it comprises a plurality of electrodes or sensors attached to the inner layer (3). The device according to claim 1, characterized in that the areas for placing sensors or electrodes correspond to a system 10-20 or any other layout. The device according to claim 1, characterized in that the electrodes are selected for use in an EEG, MEG or GEG, preferably in an EEG. The device according to claim 1, characterized in that the inner layer (3) is made of natural or synthetic rubber, preferably latex or neoprene. The device according to claim 1, characterized in that the material in the middle layer (2) is a sponge or foam rubber. The device according to claim 1, characterized in that the fluid in the middle layer (2) is air. Device1. Устройство для позиционирования и фиксирования датчиков на коже головы пациента, содержащее наружный слой (4), присоединенный к внутреннему слою (3), от которого он частично отделен средним слоем (2), причем наружный слой (4) состоит из жесткого материала, непроницаемого для текучей среды, отличающееся тем, что внутренний слой (3) изготовлен из эластичного материала, непроницае