Further more detailed examples ofdevices and methods such as of the types just described are variously disclosed in the following published references: Fram et al., in Feasibility of RF Powered Thermal Balloon Ablation of Atrioventricular Bypass Tracts via the Coronary Sinus: In vivoCanine Studies, PACE, Vol. 18, p 1518-1530 (1995); Long-term effects of percutaneous laser balloon ablation from