1. The inner port of the catheter should be unobstructed and free from blockages;
2. The mask should be equipped with a nose clip and elastic band, and have vents on both sides;
3. The oxygen supply tubing and connector should be securely connected and able to withstand a static axial tensile force of 15N for 15 seconds without breaking or detaching;
4. The oxygen supply tubing should be able to withstand a pressure of 50kPa for 15 seconds without leakage;
5. The product should be sterile.
