An apparatus for use in treating a blood vessel, the apparatus comprising: a heat application device adapted to receive power from a power source, the heat application device comprising a heating coil, the heating coil having at least one insulated layer, configured to prevent electrical conduction into tissue of the blood vessel while at the same time allowing heat conduction into that same tissue of the blood vessel; a user interface adapted to receive a request from a user to initiate power delivery to said heating coil of said heat application device; a temperature measuring device configured to measure a temperature on said heating coil of said heat application device; and a module in communication with said temperature measuring device and said user interface, said module configured to determine whether a temperature measured by said temperature measuring device satisfies a required initial temperature condition and said module configured to follow a safety procedure if said temperature measured by said temperature measuring device does not satisfy said required initial temperature condition; said module further configured to follow the safety procedure to interrupt a normal power-up process for the heating coil of the heat application device if said temperature measured by said temperature measuring device does not satisfy said required initial temperature condition by preventing delivery of power to the heating coil of the heat application device, wherein the required initial temperature condition is that the temperature measured meets or exceeds a minimum temperature in the range of 5 to 10°C lower than the normal physiologic internal temperature of the blood vessel to be treated. a heat application device adapted to receive power from a power source, the heat application device comprising a heating coil, the heating coil having at least one insulated layer, configured to prevent electrical conduction into tissue of the blood vessel while at the same time allowing heat conduction into that same tissue of the blood vessel; a user interface adapted to receive a request from a user to initiate power delivery to said heating coil of said heat application device; a temperature measuring device configured to measure a temperature on said heating coil of said heat application device; and a module in communication with said temperature measuring device and said user interface, said module configured to determine whether a temperature measured by said temperature measuring device satisfies a required initial temperature condition and said module configured to follow a safety procedure if said temperature measured by said temperature measuring device does not satisfy said required initial temperature condition; said module further configured to follow the safety procedure to interrupt a normal power-up process for the heating coil of the heat application device if said temperature measured by said temperature measuring device does not satisfy said required initial temperature condition by preventing delivery of power to the heating coil of the heat application device, wherein the required initial temperature condition is that the temperature measured meets or exceeds a minimum temperature in the range of 5 to 10°C lower than the normal physiologic internal temperature of the blood vessel to be treated.