This is my opinion and thus, take it with a grain of salt. :)
Your SOP starts out great and provides some great powerful points in the middle, especially your achievements and awards. That definitely stands out. In my opinion there is a problem of continuity from the first two parts to the last part, where you write about what you want to do and why.
Although, being a moving story, the reason you want to do biomed (your grandfather's illness) lacks punch. You should be more convincing. Everytime you say something like "fascinating" you should back it up. For example:
I am interested in the research pursued by Dr. Y and Dr. Z in the use of biomaterials for treatment and recovery of nerve damage.
Here you should mention why you are interested, what appeals to you, did you have anything to do with their work? did you read it? Did you read any of their publications? If so comment on them.
I am fascinated by the partnership of Purdue's Biomedical Engineering department with the Krannert School of Management called "Biomedship".
Here you should mention why you are fascinated. A lot of people might be fascinated by it, but that says nothing.
Also
The choice one makes, command one's life.
That is nice, but that's about it. You either expand on it, and explain why you wrote it, or you take it out.
Look through your essay and see if you can find things that need backup :). Polish it and it will be awesome.