From the 
Wall Street Journal, "
Tech-Savvy Families Use Home-Built Diabetes Device":
Third-grader Andrew Calabrese carries his backpack everywhere he goes
 at his San Diego-area school. His backpack isn’t just filled with 
books, it is carrying his robotic pancreas.
 
The device, long 
considered the Holy Grail of Type 1 diabetes technology, wasn’t 
constructed by a medical-device company. It hasn’t been approved by 
regulators.
 
It was put together by his father...
Unfortunately, the FDA isn't particularly supportive of such grass-roots endeavors.