Patent ID: 7829112

Claim:
A method of making a substantially ring-shaped drug delivery device, comprising the steps of: (a) mixing a first drug-permeable polymeric substance comprising ethylene-vinyl acetate copolymer with a first drug to form a first homogenous polymeric mixture; (b) molding the first polymeric mixture of step (a) to form a first unitary segment having a homogenous composition of the drug-permeable polymeric substance and the first drug; (c) providing a second unitary segment having a homogenous mixture of a second drug-permeable polymeric substance comprising ethylene-vinyl acetate copolymer and a second drug; and (d) coupling the first unitary segment and the second unitary segment to form a drug delivery device; wherein each of the first and second unitary segments has no membrane and is exposed on all sides of an outer surface extending between terminal ends thereof to allow for release of the drug from all sides, and wherein the drug delivery device is configured to release at least one of the first and second drugs at a substantially zero-order rate.