Suitable for all ventilators.Indications for ventilator loops include acute respiratory failure caused by various causes, including acute exacerbation of chronic respiratory failure caused by respiratory distress syndrome ((ARDS)); persistence of severe acute pulmonary edema and asthma; intraoperative and postoperative ventilation support in children's cardiothoracic surgery; fiberoptic bronchoscopy, neck and tracheal surgery in patients with respiratory insufficiency, usually with high frequency ventilation.