Patent ID: 6599275
Filing Date: 2003-07-29
Classification: A61F,A61K,A61L,A61M

Abstract:
A medical device for at least partial implantation within a patient and having outwardly and inwardly directed surfaces, comprising first and second tubes of base material, one within the other, and a plurality of treatment materials contained within the device with one thereof having a respective diffusion rate and another thereof tending to have a respective rate of diffusion slower than that of the one material, said base material of at least one of said first and second tubes being permeable to said treatment materials permitting diffusion thereof to a respective at least one of said outwardly and inwardly directed surfaces at respective diffusion rates, at least part of one of said treatment materials being in a region between the first and second tubes, and wherein said one and said another of said treatment materials are at least distributed or positioned within the device, or within at least one of the first and second tubes, or within both said tubes, in such a way that said treatment materials tend to diffuse to said at least one of said outwardly and inwardly directed surfaces of the device approximately simultaneously;wherein said at least one of the first and second tubes contain a mixture of said one and said another of said treatment materials; wherein said region contains a mixture of said one and said another of said treatment materials, and the first and second tubes contains a greater concentration of said another of said treatment materials than of said one of said treatment materials; and wherein said region and said at least one of the first and second tubes contain a major percentage of said base material and a minor percentage of said treatment materials.