Steerable Coronary Sinus Catheter, Model SCS01, 9 Fr x 20.4", Sterile R, Edwards Lifesciences Port Access Systems. || Device is a three-lumen, 9 Fr catheter with an elastomeric balloon near its tip for occluding the coronary sinus in order to retrograde perfuse the coronary circulation. An 11 Fr catheter introducer sheath, which is compatible with the catheter contamination guard, is packaged with these catheters.