목적: Although several different surgical methods of treatment for patulous Eustachian tube (PET) have been reported, standardized treatment has not been established yet. The most commonly reported technique were ET plugging. This technique appears to be generally safe and effective, but middle ear effusions are occurred as a complication. In this study, we designed silicone catheter which resembles modified funnel shape (ID 0.6 mm, ED 1mm, length 2.5mm). The purpose of this study is to evaluate the effectiveness of transtympanic insertion of silicone catheter (SC) for chronic PET patients. 방법:Surgical treatment was performed in 19 of 32 patients. Transtympanic insertion of SC was performed unilaterally in 15 patients. Five patients in 15 received simultaneous cartilage tympanoplasty (CT) because of retracted or flaccid TM. Five patients received CT only. The postoperative symptoms and otoendoscopy were evaluated in all cases. 결과:Transtympanic insertion of SC was successful in all patients except two patients, because of narrow tympanic orifice of the ET. One patient was inserted partially but another patient was failed to insert. After insertion of the SC, the symptoms of PET were relieved. There was no incidence of postoperative middle ear effusion in all cases. However remained autophony in 2 of 5 CT only patients. One of them received additional interval insertion of SC. 결론:Transtympanic insertion of SC provided a safe and effective for reducing the PET symptoms. In case with retracted or flaccid TM, simultaneous CT was successful. Further studies are necessary to investigate the effectiveness of CT only in large number of patients.