Please give me some insight if you can. The solution to your problem is not as difficult as it appears. Fields such as biometrics for example apply these very principles. Biometrics is growing by leaps and bounds. I emphasized process design and polymers.
Chemical engineering is so broad that most people have a focus of some kind.
If your program offers classes that would allow you to focus on the subject that interest you, this is certainly a good way to go. Anyway I look at this, doing your undergraduate work in chemical engineering is the way to go. You'll just have to be specific in the way that you go about it. Tell all of the professors about your goals, get involved in research specific to biomed, etc. Feature Articles For Your Information ChE in Everyday Life ChE in Medicine Alternative Energy Proc.