Further more detailed examples of devices 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 vivo Canine Studies,??? PACE, Vol. 18, p 1518-1530 (1995); ???Long-term effects of percutaneous laser balloon ablati