1. A method of evaluating a patient’s vessel, comprising: introducing at least one device into a patient’s vessel； obtaining from the at least one device the results of measuring proximal pressure in the vessel at a position proximal to the vessel stenosis for at least one patient’s cardiac cycle； the specified at least one instrument for measuring the distal pressure in the vessel at a position distal to the vessel stenosis for at least one patient’s cardiac cycle； iagnosticheskogo window in the cardiac cycle of the patient, the diagnostic window covers only a portion of the patient's cardiac cycle； calculation of the pressure difference between the results of measuring the distal pressure, which are obtained in the diagnostic window, and the results of measuring proximal pressure, which are obtained in the diagnostic window. 2. A system comprising: at least one device, in size and shape, designed to be inserted into a patient’s vessel； the processor is in communication with at least one device, the processor being designed to: obtain proximal pressure measurements for at least one patient’s cardiac cycle at least one device, wherein said at least one device is located in the vessel in a position proximal to the stenosis of the vessel； to obtain results of measuring distal pressure for at least at least one cardiac cycle of the patient from at least one device, said at least one device being located in the vessel in a position distal to the vessel stenosis； to select a diagnostic1. Способ оценки сосуда пациента, предусматривающий:введение в сосуд пациента по меньшей мере одного прибора；получение от указанного по меньшей мере одного прибора результатов измерения проксимального давления в сосуде в положении проксимальнее стеноза сосуда на протяжении по меньшей мере одного сердечного цикла пациента；получение от указанного по меньшей мере одного прибора результатов измерения дистального давления в сосуде в положении дистальнее стеноза сосуда на протяжении по меньшей ме
