Ultrasonic treatment of peripheral neuritis

summary

Cerebral palsy refers to the non progressive brain injury syndrome caused by various reasons from before birth to 1 month after birth, mainly manifested as central dyskinesia, dystonia, limb spasm, abnormal posture and reflex. It can also be accompanied by epilepsy, mental retardation, language disorders, visual and auditory disorders. How about ultrasound in the treatment of peripheral neuritis? Let's talk about this.

Ultrasonic treatment of peripheral neuritis

First, the method of applying ultrasound to the human body to achieve the purpose of treatment is called ultrasonic therapy. The application of ultrasonic therapy is more and more extensive, which has far exceeded the original general therapy in physical therapy department, such as ultrasonic treatment of cancer, urinary tract lithotripsy and stomatology. Therefore, the concept of ultrasonic therapy should be generalized (including all kinds of special ultrasonic therapy) and narrow (referring to the commonly used noninvasive dose therapy in physical therapy department).

Second: the absorption and penetration of ultrasound: when the ultrasound propagates in the medium, its intensity decreases with its propagation distance, which indicates that the ultrasonic energy is absorbed. The absorption of ultrasound is related to the density, viscosity, thermal conductivity and frequency of the medium. The absorption coefficient of ultrasound in air is about 1000 times larger than that in water. And the absorption coefficient of the medium is directly proportional to the square of the ultrasonic frequency, so the attenuation of high-frequency ultrasound in the air is extremely intense, so although it is a tiny air bubble under the sound head in the treatment, it should also be avoided.

Third: the space range of ultrasonic propagation in the medium, that is, the area where the medium is affected by the ultrasonic vibration energy, is called the ultrasonic sound field. Because of its high frequency, ultrasound has the beam characteristics similar to light, which is called near-field region. After that, the beam begins to diffuse, which is called far-field region. Because of this characteristic of ultrasonic field, in order to overcome the uneven distribution of energy, the sound head should move slowly in the treatment site.

matters needing attention

There are various methods to produce ultrasonic wave, mainly using piezoelectric ultrasonic generator, which is made according to the principle of piezoelectric effect. When a crystal with piezoelectric effect is compressed or stretched, it will produce equal number of charges with opposite sign on its stress surface. This physical phenomenon is called piezoelectric effect.