The centuries-old experience of surgery does not cast doubt on the need for drainage of a purulent wound in order to remove microbes, discharge and tissue decay products from its cavity. Full drainage, providing a sufficient outflow of wound exudate, creates the best conditions for the speedy rejection of necrotic tissues and the transition of the healing process to the regeneration phase. There are three mechanisms of action of drainage. The first is the outflow of discharge by gravity, if the drainage is diverted from the lowest point of the purulent cavity with the corresponding position of the patient's body in bed. The second is designed for the capillary suction properties of the drainage, similar to the principle of the wick of a kerosene lamp. The third one provides active drainage due to prolonged washing of the wound with antibacterial solutions [3].