Patent ID: 7135039

Claim:
A radially expandable prosthesis for implantation in a lumen comprising a tubular wall showing an inner surface and an outer surface, the tubular wall is provided with cuts forming solid struts having a predetermined thickness and enabling the prosthesis to expand, said solid struts having a longitudinal direction and showing reservoirs made in said outer surface for containing a therapeutic agent, wherein at least a number of said reservoirs are perforating holes over the entire thickness of the strut through the strut to form an outer opening at the outer surface of the tubular wall and an inner opening at the inner surface of the tubular wall, said inner opening being smaller than said outer opening, said outer opening having a width, measured perpendicularly to said longitudinal direction, larger than 20 μm but smaller than 100 μm and a length, measured in said longitudinal direction, at most five times said width, the prosthesis, including said perforating holes, having a smooth electrochemically polished surface.