Why does the introduction of patented drugs and medical devices not violate the patent law?

Patented drugs have a patent term .. (I don't remember the websites and periodicals. I studied in a pharmaceutical company and read journals about the use of patented drugs at home and abroad. ) You can use some patented drugs whose patent period has expired through legal channels. ....

Medical device import patent? It's not illegal to use medical devices, is it? In regular hospitals, as long as a resolution is passed, it is no problem to introduce medical devices from normal and legal. ..

Drugs/medical devices are all means to save lives ... It is not against the patent law to use patented drugs and medical devices regularly.

The violation of patent law is aimed at the manufacturer's ... normal use. I have never heard of violating the patent law. ..