@paul2752 - If you are interested in my son’s path to graduate school, read here. http://talk.collegeconfidential.com/graduate-school/2053985-thank-you.html#latest
My son’s summer research program in Germany was very solid, but concerned carbon fiber for aerospace applications. It has nothing to do with modeling plasma for space propulsion and other applications, the research area he wants to study in graduate school. His second research project his first semester this year concerned laser measurement of plasma, which is closer, but still not what he really wants to study. So based on just one student, I would guess that you should be fine, especially if you can get some research experience in the biomedical area between now and your application. I’m assuming that you will be applying next December/January, so you have plenty of time.
FYI, my son will graduate with a 3.8 average. He was also fortunate enough to be able to work with and take classes from professors in his field with solid connections, who were willing to write strong recommendations. At many top aerospace engineering programs, he would not even have been exposed to plasma propulsion or other applications. Also, his GRE was very good (168 V/165Q/6W) but not spectacular. He took it cold and didn’t want to spend any more time on it. So this is consistent with what several others with far more knowledge have said. Grades and research are far more important, along with recommendations and your personal statement. You don’t want to tank the GRE, but don’t stress out trying to get a perfect score. It wouldn’t make up for other weaknesses.
Good luck!