Thoracic electrical bioimpedance (TEB) is the basis of ICG measurement. Using this technology, the probe sends and receives a low-frequency electrical signal (1mA) through the chest cavity to obtain the change of the impedance of the current in the chest cavity, and then the blood flow value is obtained through the algorithm.
the change of impedance reflects the change of blood flow cycle entering and excluding the heart. Studies have shown that the change of impedance is directly related to the change of blood flow through the thoracic aorta during contraction. In the diastolic phase of the heart, the change of impedance is related to the venous blood flow in the thoracic cavity.
general working principle
a probe for obtaining ICG signals is arranged on the patient. Each probe usually has two electrodes connected into a whole.
Put the probe in the designated area of the patient's neck and chest to measure the change of resistance when the current passes through the chest cavity.
The external electrode continuously sends painless low-frequency electrical signals.
The internal electrode continuously detects and measures the change value of impedance.
The path of electrical signals with minimum resistance.