The surgery is performed under local or general anaesthesia, based on individual needs and the level of the surgery. The surgery takes from over ten minutes to a few hours, depending on the extent of the surgery. The operative areas are disinfected. An infiltration cannula, followed by a fat harvesting cannula, is inserted into the hypodermis through some small incisions. Cannulas extract from a few dozens of millilitres to a few litres of liquid fat. Extracted fat may be processed in a special way before they are injected into a selected area of the body—fat may be washed, filtered, sedimented, centrifuged, and only then injected. After the surgery the incision is stitched up and covered with a special plaster.