Legal basis: Article 22 of the Patent Law of People's Republic of China (PRC), the invention and utility model for which a patent is applied shall be novel, creative and practical. Novelty means that the invention or utility model does not belong to the prior art; No unit or individual has completed the same invention and creation; Or the utility model has been filed with the patent administration department of the State Council before the filing date, and has been recorded in the patent application documents published or announced after the filing date. Creativity means that compared with the prior art, the invention has outstanding substantive features and remarkable progress, and the utility model has substantive features and progress. Practicality means that the inventive or novel sinus can be manufactured or used, and can produce positive effects. The existing technology mentioned in this law refers to the technology known to the public at home and abroad before the date of application.