A surgical dilator comprising a catheter and an air bag. The first recess of the airbag is recessed at the first end of the airbag and encloses the first recess. A first junction of the balloon is coupled to the first end of the catheter. The second recess of the airbag is recessed at the second end of the airbag and encloses the second recess. The second joint of the air bag is coupled to the tube wall of the catheter and defines an inflation hole. The air bag can be switched between a contracted state and an expanded state. Therefore, after the creation of the human body tissue, the tissue that is not deepened in the deeper part will not be deformed, and the doctor will observe the scene through the endoscope, so that the doctor can grasp and correctly judge the condition of the organization. And for hemostasis, burning, peeling, placing artificial objects and other surgical treatments, in order to establish an operation pipeline for surgery, or to prepare for reconstruction of the structure.一種手術擴張器，包括導管和氣囊。氣囊的第一凹陷部凹設於氣囊的第一端部並圍構第一凹槽。氣囊的第一結合部結合於導管的第一端部。氣囊的第二凹陷部凹設於氣囊的第二端部並圍構第二凹槽。氣囊的第二結合部結合於導管的管壁並開設充氣孔。氣囊可切換於收縮狀態與膨脹狀態之間。藉此，本創作撐開人體組織以後，更深處未被撐開之處的組織不會變形，俾利醫師透過內視鏡拍攝觀察該處，使醫師能夠掌握並且正確判斷該處的組織的狀況，並作止血、燒切、剝離、置入人工物等手術處理，以便建立操作管道作手術，或者組織重建結構的準備。
