US Patent 7767219 - Magnetic nanocapsules for drug delivery

http://ip.com/patent/US7767219

This patent from Boston Scientific Scimed teaches a system of controlled release nanocapsules for drug delivery. Claim 1 reads:

1. A medical device adapted for implantation or insertion into a patient, said medical device comprising a magnetic or paramagnetic region and a plurality of nanocapsules that are magnetically attracted to said magnetic or paramagnetic region, said nanocapsules comprising a therapeutic agent, a magnetic or paramagnetic material, and a polyelectrolyte multilayer shell.