Disclosed is a design for catheter introducer sheaths which adds several new features. Detailed drawings are on file. The new design allows perfusion of fluids during total obstruction of the lumen by the introducer or a catheter with the designated sheath size. The new introducer is particularly useful for thrombolytic infusions and longterm use to reduce thrombosis. Also disclosed is a multi-port introducer sheath used for multicatheter placement. A larger version may be used for stent graft placement. Multiple ports will allow the use of catheter and guide wire simultaneously or the technique of kissing balloons angioplasty with a single arterial/venous access.