Tissue engineering

Hi Giselle! 
The best part of engineering is that it is very interdisciplinary. Sure every branch has its specialties but there is overlap. If you get into technicalities Bioengineering has more to do with engineering of biological things (ie Tissue Engineering) where as Biomedical engineering deals with engineering of medical related things (ie Bio Materials and medical equipment). Does that matter? Not really. What matters is finding a school with professors studying things you want to study. A degree in Biomedical Engineering isn't going to focus on Tissue Engineering but there will probably be senior electives that you can take to specialize. What matters more than your degree is the professors. Before you choose a school, look at what the professors are researching. If none of them are researching Tissue Engineering, nobody will be able to help you. You probably don't want to choose that school. If someone is studying Tissue Engineering, email them, set up a meeting, tell them this is what I'm interested in, talk to them about exactly what they do. You're going to learn more about Tissue Engineering in a lab and they might have those lab opportunities they can offer you. Even if they don't they will be able to steer you in the right direction.  

I studied Chemical Engineering because I felt it gave me wider job opportunities but I really loved Tissue Engineering so I started talking to Tissue Engineering professors.  My school didn't have a Bioengineering Department so all Tissue Engineering was under the Biomedical Department. Pretty much I emailed every professor the remotely dealt with Tissue Engineering multiple times until one of them responded. Tenacity will get you points because it shows passion. I was the only person in Chemical Engineering to work in the Biomedical labs. I never had the professor I worked for as a teacher. I never would have met him if I hadn't sent a bunch of obnoxious emails. 
Figure out what you want and run straight for it with everything you've got. You are in control of your degree and your experience. If you want to do something, find somebody who is doing it and ask them all the questions you can.

In summary: the title of Bioengineering or Biomedical Engineering doesn't really matter that much. You can do Tissue Engineering with either degree if you set your sight on it.