If it is a manufacturer, we have to do the production license, production out of the product to apply for product registration certificate, divided into a class of two and three categories, respectively, refers to different medical devices, a class of municipal Drug Administration can be processed, two or three categories to the provincial Drug Administration to apply for (the process is very long, the need for clinical trials); your friend's case to go to the Drug Administration to check the first medical oxygen equipment belongs to which category of equipment, and the medical oxygen equipment belongs to which category of equipment. According to different categories have different application process, and different requirements.
As for the business license, you can find a company with a business license as your agent or distributor can sell it, or you can apply for it yourself, but it's more troublesome