With Coronary Bypass Bessels. Use the bypass tubing to instantly install single, double, or triple bypasses, representing grafts of the saphenous vein of the lower leg, to connect the ascending aorta to the coronary arteries. Or in place of one of the vein grafts, connect the left internal mammary artery to the left anterior descending cornoary artery (LIMA bypass). Even with bypass vessels installed, you have full internal access to all four heart chambers and the mitral and tricuspid valves, by means of exclusive flip-open hinged access portals.