I'm skeptical. I've worked on devices with no electronics and no moving parts that used as many or more large animals.

It really depends on why you are doing animal studies in the first place.

If you have a working product and are just confirming functionality before going to human trials, sure you don't need that much animal work.

If you are doing active research, I'm trying to understand,fix, or improve a design, you can run through a lot of animals.

Usually it's best to try to do that stuff in vitro first, figure out some analog for animals that you can use on the bench.

Surely you understand that some systems don't have a in vitro model. Particularly , the biological response and interaction is the unknown. I'm working on such a project now. It'll likely require many dozens of large animals if not hundreds to collect some semblance of data to support human use. I would consider anything less unethical and irresponsible development