Patent ID: 8057534

Claim:
An endoprosthesis, comprising: a plurality of struts, the plurality of struts comprising a plurality of generally circumferential struts being interconnected to one another or connected by one or more connecting struts, wherein at least one strut of the plurality of struts comprises a bioerodible magnesium or a bioerodible magnesium alloy, the at least one strut having a longest dimension extending in a z-axis, the at least one strut having a cross-section in an X-Y plane perpendicular to the z-axis, wherein the at least one strut has an initial geometry in the X-Y plane characterized by initial dimensions, and an erosion modifying material provided on the surface of the at least one strut which controls erosion to form a predetermined geometry such that, after erosion of at least about 50 percent of the area of the at least one strut in the X-Y plane, at least one initial dimension of the initial geometry is maintained in the X-Y plane.