Technically you will have to take MBBS to become a doctor and not bio medical engineering. So I'll assume that you are asking about doing a PhD in biomedical engineering.
There are a very few colleges that offer bio medical engineering directly for undergraduation. It would be advisable to do B.Tech in Bio Technology and then do M.Tech in Bio Medicine. If you score a good gpa (8 or more) in B.Tech, some colleges let you do PhD directly (without masters).