A cannula is a hollow plastic tube. It allows preparations to flow through it and be precisely administered to the patient intravenously or subcutaneously. It is most commonly used in medicine. In hospitals, it is used as a venflon for administering IVs without the need to puncture the patient's vein each time. Cannulas have also found their way into aesthetic medicine clinics. Thanks to their flexible form, they enable the precise administration of liquid preparations under the skin. They are most commonly used for injecting fillers - preparations designed to model facial contours, fill tissue defects and generally improve the appearance and condition of the skin. Unlike a needle, the cannula does not have a truncated, sharp edge. It has a blunt tip. This allows safe delivery to the most sensitive areas of the face, such as the tear valley and nasolabial furrows. Other treatments performed with the cannula in aesthetic medicine clinics include needle mesotherapy, carboxytherapy or injection lipolysis.