In some embodiments, there is provided an apparatus for affecting the temperature of a bodily organ using a bodily fluid as a thermic medium; other embodiments provide a method of using the apparatus. The apparatus can include a fluid-drawing device such as a needle, an extra-bodily fluid pathway that can comprise a flexible medical tube, a temperature-affecting device such as a Peltier cooler or resistive heater a pump such as a peristaltic pump, and a fluid-insertion device. The temperature affecting device can be in thermal contact with the extra-bodily fluid pathway.