Patent ID: 7179251

Claim:
A system for delivering therapeutic to an irregular interior vessel surface comprising: a catheter having a proximal end, a distal end, and a first internal lumen; a source of fluid in communication with the first internal lumen of the catheter; and a first inflatable balloon having an exterior surface and an interior surface, the first inflatable balloon attached to the distal end of the catheter and in fluid communication with the first internal lumen of the catheter, the first inflatable balloon having a measurable elasticity, the exterior surface of the first inflatable balloon at least partially covered with a therapeutic when the first inflatable balloon is in an initial unexpanded state, the interior surface of the first inflatable balloon free from contact with the therapeutic when the exterior surface of the first inflatable balloon is at least partially covered with the therapeutic when the first inflatable balloon is in an initial unexpanded state, the exterior surface of the first inflatable balloon at least partially covered with a therapeutic when the first inflatable balloon is in an expanded state; and a dilation bladder located within the first inflatable balloon, the dilation bladder attached to the distal end of the catheter and in fluid communication with a second internal lumen of the catheter by way of a dilation bladder opening in the catheter, the dilation bladder deformable from a non-inflated position to an inflated position, the dilation bladder having a measurable elasticity, the elasticity of the first inflatable balloon being greater than the elasticity of the dilation bladder.