1. A device for measuring a pressure gradient of a fluid, comprising: a multisensor assembly contained in a protective layer extending from a proximal end to a distal end portion, wherein the distal end outside the distal end portion comprises a flexible distal tip； a multisensor assembly comprising a plurality of optical fibers extending from the proximal end to the distal end； sensor means located in the far end and containing a number of optical sensors for measuring pressure in a number of positions a fraction of the length of the indicated distal end part； each of the row of optical fibers is optically connected at its distal end to a corresponding one of the row of optical sensors and optical input / output at the indicated near part； an opening in the protective layer next to each optical sensor for contact with the fluid medium； at least the distal terminal portion of the protective layer has an outer diameter suitable for intravascular or intraluminal administration through a microcatheter. 2. The device according to claim 1, characterized in that the protective layer contains an inner diameter defining the lumen, while the multisensor assembly passes into the lumen from the proximal end to the distal end part. The device according to claim 2, characterized in that the tubular protective layer contains one of the microcatheter and the winding of the wire guide. A device according to claim 1, characterized in that the optical sensors include Micro-Opto-Mechanical Systems (MOMS) pressure sensors. The device according to claim 4, characterized in that said MOMS sensors include Fabry-Perot MOMS sensors. construction according to claim 1, characterized in that the device is provided1. Устройство для измерения градиента давления текучей среды, содержащее:мультисенсорный узел, содержащийся в защитном слое, проходящий от ближнего конца к дальней оконечной части, при этом дальний конец за пределами дальней оконечной части содержит гибкий дальний наконечник；мультисен
