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Fat removal procedures are used mostly in cosmetic surgery with the intention of removing unwanted adipose tissue.The procedure may be invasive, as with liposuction, [1] or noninvasive using laser therapy, radiofrequency, ultrasound or cold (cryoablation or cryolipolysis) to reduce fat, sometimes in combination with injections.
A 2023 review of 18 studies reported average reductions in fat thickness of 2.0 to 5.1 mm as measured by ultrasound, concluding that the procedure is safe and modestly effective, though the quality of available data was considered low. [2]
Ultrasonic cavitation device is a surgical device using low frequency ultrasound energy to dissect or fragment tissues with low fiber content. It is basically an ultrasound probe (acoustic vibrator) combined with an aspirator device ( suction ).
Sold under the brand name of CoolSculpting, cryolipolyis is not a type of liposuction but rather a non-surgical fat reduction procedure that freezes fat cells; it is an FDA-approved, non-invasive procedure that uses cooling to disrupt fat cells underneath the dermis. [34]
On the other hand, transient cavitation is where these cavitation bubbles uncontrollably and rapidly grow and decay over many acoustic pressure cycles. [1] However, while cavitation is considered the primary mechanism for sonophoresis, the gas bubbles that contribute to cavitation are generated by a process termed rectified diffusion.
As an ultrasound acoustic wave cannot propagates through the compressive tissue, such as rubber, human tissues part of it and the ultrasound energy will be turned to converted as heat, with focused beams, a very small region of heating can be achieved the part of shallow deep in tissues (usually on the order of 2~3 millimeters).