Abstract: A cannula having a main lumen extending therethrough is provided with a tourniquet integrally mounted to the cannula body. The tourniquet is positioned so that suture thread can be withdrawn therethrough and frictionally retained in place with respect to the cannula body. This structure is ideally suited for use in a cannula which is received in an incision surrounded by a purse string suture where the purse string suture is drawn tight to create a substantially fluid tight seal between the vessel wall and the cannula. The tourniquet lumens can be integrally molded with the cannula body or can be fixedly mounted thereto. In addition to the tourniquet, a pressure sensing lumen can similarly be integrated into the structure of the cannula body, depending upon the particular application of the cannula. This structure of the cannula is ideally suited for use as arterial cannulas, atrium cannulas and venous cannulas.

Abstract: An improved retrograde coronary sinus perfusion catheter includes a flexible, tubular catheter body and an inflatable balloon. The catheter body has proximal and distal ends and an interior lumen. The inflatable balloon is located adjacent the distal end of the catheter body and has proximal and distal edges. The improvement includes an echogenicity enhancement embedded within the catheter body. The echogenicity enhancement is adapted to reflect ultrasonic waves at a characteristic different from the catheter body.