Microwave therapeutic instrument refers to electromagnetic waves with frequency from 300MHZ to GHZ. In the 265438+1930s, medical workers discovered the biological effects of microwaves. Clinically, the interaction between microwave and organism can be divided into two categories, namely microwave-induced thermal effect and non-microwave-induced thermal effect. Microwave hyperthermia used in microwave therapeutic instrument is a non-contact heating method, and there is no possibility of heat and electric burn caused by electrical contact. Due to the improvement of various technologies, microwave therapy can be completed in outpatient department, without anesthesia, and it is simple and safe.

Principle 2

Non-ionization-When the quantum energy of microwave interacts with matter, it does not change the internal structure of the matter molecule (only changes its motion state). Both short wave and ultrashort wave belong to electromagnetic wave, but compared with microwave, the clinical effect is very different because of the greatly reduced frequency. Blood, lymph and cerebrospinal fluid of human body have special absorption effect on microwave. For example, under the action of electrodes, the temperature rise ratio between fat and muscle is about 9 1, and there is a layer of fat under human skin, so fat absorbs too much electromagnetic energy to generate heat, which will inevitably hinder the role of electromagnetic energy in deep tissues. However, the heat production ratio of microwave to human fat and muscle is close to 1 to 1, so the thermal effect of microwave is more uniform, and it still has significant thermal effect in the deeper muscle layer. Clinical therapeutic mechanism of microwave biology Microwave thermal effect Human tissues are composed of various organic and inorganic compounds. These substances can have different electrical properties, such as inorganic ions such as sodium, potassium, calcium, iodine and iron in human body. They are suddenly attracted and repelled in the microwave electromagnetic field, forming vibrations in the direction of the electric field. In the process of vibration, the friction between ions and surrounding media will generate heat. The colloidal tissue of human body is non-conductive, but some colloidal particles will conduct electricity when they absorb ions around them, forming charged colloids. These substances will also produce friction and collision motion similar to ions under the action of microwave field, and generate heat. Muscle, fat, protein, viscera, blood and lymph in human tissues are all electrical dielectrics, and they contain a lot of water. Water is a polar molecule, and the positive and negative centers of water molecules coincide, so it usually does not show electrical characteristics. Under the microwave electromagnetic field, water molecules are polarized, and the positive and negative centers of water molecules do not coincide. The electric dipole in electricity is formed and rearranged in the instantaneous field direction of high frequency field, which makes it rotate sharply and produces friction heat.