Ultrasound is sound waves that are transmitted at a frequency higher than 20,000 Hz per second and it is beyond the normal hearing range of humans.
Focused ultrasound is a noninvasive treatment therapy. Its working principle is to make use of the effective penetration of ultrasound waves through human tissues; the ultrasound beams generated by the ultrasound transducer outside the human body is precisely focused on the target lesion in the body, causing coagulative necrosis of the lesion by the conversion of mechanical effect into thermal and cavitation effect, thereby achieving non-invasive ablation of the lesion. It has been applied not only in the treatment of solid tumors, such as uterine fibroids, adenomyosis, liver tumors, pancreatic cancer, kidney tumors, bone tumors and breast tumors.

High intensity focused ultrasound ablation (HIFU ablation) is a new technology to ablate and kill the tumors in the body without cutting open or puncturing, so HIFU ablation is also called focused ultrasound ablative technology.

Its working principle is similar to using a convex lens to concentrate the sunlight which produces high temperature at the focal point that can lit the paper on fire. Ultrasound can also be focused and travels through the body safely. As a noninvasive therapy, HIFUfocuses the ultrasound energy outside the human body on the target lesion inside the body, producing high temperature (60 ℃ or higher) at the focal point instantly and causing irreversible coagulative necrosis of the target lesion, without damaging the tissues in the acoustic pathway and those surrounding the target lesion. The necrotic tissues will be gradually absorbed or become scars (fibrosis).

As a non-invasive therapy, HIFU ablation requires no anesthesia but a small amount of sedatives and analgesics, which allows the patient to stay awake during treatment and report her discomfort (if any) to the doctor in time. And the sedatives and analgesics used will be metabolized quickly in the body with almost no side effects.