As we know, the human body is like a conductor, connecting all kinds of conductive materials and electrical appliances. The power consumption of each electrical appliance and the conductivity of each channel are different, and the electrical signal indexes such as electrical impedance are also different.
The electrical impedance characteristics of human body are mainly manifested in the following aspects:
① There are great impedance differences among different biological tissues. For example, the impedance of cerebrospinal fluid can be 250 times lower than that of bone tissue. The ratio of the maximum resistivity to the minimum resistivity of the same soft tissue can also reach 35: 1.
② The impedance of the same biological tissue is different in different physiological states. For example, when the temperature of the Party organization increases or decreases by 65438 0℃, the impedance value will change by about 2%, and the blood flow in the organization, the filling of body fluids, the periodic activity of the heart, the change of organ volume and the breathing process will all cause the periodic change of the impedance value.
③ Compared with the normal impedance, the impedance of biological tissue changes significantly when it is sick. For example, the electrical impedance of brain tumor variant tissue can be 13 times higher than that of normal tissue. The impedance value of muscle atrophy is about twice that of normal tissue. The electrical impedance of abnormal tissue of cerebral hemorrhage is only 1/4 of that of normal tissue.
④ The impedance characteristics of biological tissues are related to frequency and direction. The impedance characteristics at different frequencies are different; When some biological tissues are measured in different directions, the impedance values are also different.
Therefore, it is not only technically feasible, but also advanced to judge health risks by measuring the electrical impedance of various parts and organs in a certain direction, comprehensively analyzing these data by means of topological analysis and cross analysis, and comparing them with the database.