Contraindications:

1) No drainage of pneumothorax and pneumomediastinum; bullae of lung;hemoptysis;acute myocardial infarction;

forbidden using mechanical for ventilating before adding blood when hemorrhagic shock.

2) Please use it under guiding of experienced anesthetist or clinicians;and pay attention that the mechanical interface of

the circuit need to assort with anesthesia and breathing machine.

3) Never use when package damaged or leaking; for single use,destroyed after used.