A drug delivery catheter assembly, including an expandable, porous outer membrane that is insertable into a blood vessel and positioned adjacent a stenotic atherosclerotic lesion on the interior wall of the blood vessel. The membrane is expanded into contact with the lesion, either mechanically or hydraulically....http://www.google.co.uk/patents/US5306250?utm_source=gb-gplus-sharePatent US5306250 - Method and apparatus for intravascular drug delivery
