The pre-tunnelling is performed with the blunt-tip, multi-perforation cannula used to infiltrate the anaesthetic solution to the breast tissues. A blunt-tip, 4-mm cannula, connected either to a medical-grade vacuum pump or to a syringe, is used to aspirate the adipose fat. The cannula is maneuvered laterally (in fanning movements), beginning in the deep plane of the breast and concluding in the superficial plane of the breast; the adipose fat sucked from the breast is a yellow, fatty, bloodless fluid; the liposuction concludes upon drawing the required volume of fat, or when the fat becomes bloody.[citation needed]