Sphincter treatment apparatus

A method for treating gastroesophageal reflux disease by treating tissue at or near a lower esophageal sphincter to tighten the sphincter, the method comprising:

• providing an apparatus comprising an elongated member having at least one lumen and an expansion device coupled to the elongated member;
• inserting the apparatus with the expansion device in a non-expanded position;
• expanding the expansion device to an expanded position;
• advancing a first electrode through a first lumen of a first arm of the expansion device so the first electrode extends radially outwardly to apply energy to the tissue to form lesions to tighten the sphincter to reduce frequency of reflux of stomach contents into an esophagus;
• conveying a fluid through a second lumen of the first arm of the expansion device to cool the tissue to regulate temperature of the tissue;
• measuring tissue temperature of the tissue to regulate fluid flow to regulate temperature of the tissue;
• and
• retracting the electrode and moving the expansion device back to the non-expanded position for removal of the apparatus.