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扩张器一组共7根,有直径前端0.1cm～0.5cm,末端0.5cm～1.5cm 等各种型号.操作时可根据狭窄口径的大小选择不同型号.其性能主要是通过机械性扩张,达到狭窄口径的增大,使用时遵循先细后粗的原则,从而达到扩张目的.
A total of seven dilators, a diameter of the front 0.1cm ~ 0.5cm, the end of the 0.5cm ~ 1.5cm and other models. Operation can be based on the size of the narrow aperture to choose different models. Its performance is mainly through the mechanical expansion to reach Narrow caliber increases, using the principle of thinner and heavier, so as to achieve the purpose of expansion.