A kind of system includes conduit and charging component for assessing to the occlusion areas of blood flow, and first electrode is configured to place inflatable upstream and second electrode is configured to place inflatable downstream, and charging component is configured to be expanded into block blood flow region. The system further includes current/voltage source, a resistance and voltmeter, and component is along being configured to form impedance measuring circuit with the first and second electrodes, be configured as detection impedance variations instruction occlusion areas into blood flow.
