This invention is a circumferential ablation device assembly which is adapted to forming a circumferential conduction block in a pulmonary vein. The spacer pin is formed of a semispherical portion and a conical frustum portion. Each itinerary is analyzed to determine a set of alternative itineraries comparable to the travel itinerary specified in the request based on selected rules associated with travel. Optionally, the method comprises implanting a source of stimulation andor recorder within the patient’s body, and then electrically coupling the proximal ends of the electrical leads to the implanted device.