Patent ID: 7435256

Claim:
A medical device for implantation in a body comprising: a structure; a set of first coated pellets, each of said first coated pellets containing at least one first therapeutic composition, the set of first coated pellets deposited on the structure at a first site for controlled delivery of the at least one first therapeutic composition to a desired location within the body; and a set of second coated pellets, each of said second coated pellets containing at least one second therapeutic composition, the set of second coated pellets deposited on the structure at a second site for controlled delivery of the at least one second therapeutic composition to a desired location within the body; wherein each of said first coated pellets is covered with a first coating and each of said second coated pellets is covered with a second coating; wherein the first coating is thinner than the second coating and has a faster in vivo decomposition rate relative to the second coating to release the first therapeutic composition from the first site faster than the second therapeutic composition from the second site; and wherein each of said first coated pellets contains a substance in addition to the first therapeutic composition such that each of the first coated pellets is substantially the same size as each of said second coated pellets.