A device set designed for PCNL surgery includes a puncture needle, a guidewire, a dilator, a balloon catheter, a sheath, and a drainage catheter which are all placed in a single package. A tip length of the dilator is substantially the same as a tip length of the balloon catheter. The device set may include a puncture needle, a guidewire, a plurality of dilators having different sizes, a sheath, and a drainage catheter, which are all placed in a single package, wherein all the dilators have substantially the same tip length.