Ultrasonic-Assisted Technique -or UAL- is used in conjunction with the Tumescent Technique, and is employed primarily for the removal of fatty tissue in hard-to-treat areas such as under the chin, the calves, and stubborn 'love handles' (handfuls of fat on the hips). UAL is the second part of a two-step process when carried out with the Tumescent Technique. After the injection of the saline and medicine solution, the cannula (a thin hollow tube attached to a surgical generator and suction device) is inserted through a small incision into the patient's fatty tissue. The generator emits high-pitched sound waves, which serve to rapidly melt down and ultimately liquefy the fat. This method allows for simple, quick and safe evacuation of the excess fat cells; the cannula gently suctions out the liquefied tissue without damaging the surrounding capillaries and muscle tissue.

While UAL clearly provides some benefits over other methods of Liposuction, patients should be aware that there are two types of UAL: internal and external. Internal UAL requires the administration of general anaesthesia or IV sedation because of the pain associated with the metal probe that is inserted directly into the fatty tissue. This type of UAL is rarely used today because of its association with severe burns, adverse reactions to anaesthesia, and high-volume blood loss. External UAL involves the use of a paddle emitting high frequency sound-waves that is directed at the target area. After the tumescent fluid has been inserted, the sound-waves emitted by the paddle break up the fat cells gently, making it easier for the surgeon to vacuum with the help of a microcannula. External UAL is performed without the use of general anaesthesia.