In 1922, the first invention patent for ultrasound treatment appeared in Germany;
The field of ultrasound treatment in China started a little later, and only a few hospitals carried out ultrasound treatment in the early 1950s. In 1950, the company first began to use 800KHz frequency ultrasonic therapy machines to treat various diseases in Beijing. In the 1950s, it was gradually promoted and domestically produced instruments were introduced. Public literature reports first appeared in 1957.