What is the item number of the patent? I only know the application number now.

There are no items in the patent. It should belong to the field, for example, your technical products belong to the field of household appliances, and what is made in the field of medical devices is similar to your patented technology or your rights, so it is not infringement. You applied for a patent and you know exactly what you should protect. With the application number, you can use it for product promotion or your product listing. The patent right shall be calculated from the date of application.