Let me tell you some simple and practical methods and tricks.
1, through Google's patent search website /sipo2008/zljs/. You can only download page by page here. There are other places to download, but it's too much trouble for you.
In addition, to tell you a trick, you can now search for a medical patent applied by an American company in China, which is likely to have an American patent family. You can follow the patent acceleration method above to find it, hehe.
I hope I can help you by writing so much, and I hope you can give me more.