This website offers an extensive collection of manuals for various devices, including medical ones.
A manual might be a lifesaver for a translator because it can show or explain how a "thing" looks like or how exactly it is used.
Many of the manuals are multilingual but there is no option to search by language.
The best way to navigate this library is to search by trade name or brand name. You can also use Google by adding "manualzz.com" in quotation marks to your search query.