The surgeon begins by inserting a cannula (a slim, hollow tube) into small incisions near the area to be recontoured. The cannula is moved through the layers of tissue and extracts the necessary fat. Several techniques exist. The super-wet technique injects fluid into the patient's body, roughly the same amount as the fat to be extracted. The tumescent technique injects double or even triple the amount of fluid. In UAL (Ultrasound-Assisted Lipoplasty), a specially designed cannula liquefies the fat and suctions it away.