Difference: "disposable medical device" and "sterile disposable medical device". The former has a large scope, such as medical masks, etc., belong to the disposable medical devices, but does not belong to the sterile disposable medical devices, medical masks belong to the scope of Class I medical devices. Needles, injection tubes, infusion bags, etc., although not in direct contact with the human body, but its contents will be directly into the human body, need to be strictly in accordance with the implementation of aseptic operation, belongs to the scope of Class III medical devices. The same is true for needleless syringes.