Animal testing is not ethical … ever. Following that same thought process, however, neither is digging up the ground to place buildings there instead. Causing air pollution by driving a car is also unethical yet millions of people do it every day. The point I’m making is that with technological advancements, there will also unavoidably be downsides. In the case of medical devices, that downside is animal testing. Even if a computer simulation built to mimic the human anatomy was created, a test in something alive will be needed. For now, barring humans volunteering to replace the animals in the animal testing phase, animal testing is the best we have. Hopefully, in the future, this is not the case.