The invention relates to a hard lens calculus removing device, which is of a double-sheath structure. A conical guide head is arranged at a far end of an inner sheath, can enable an outer sheath to be smoothly guided into a cavity (including inner and outer
bile duct antrums of a liver, a
bile duct antrum, a cholecyst
antrum and a
renal pelvis) and avoids damage of the outer sheath on circumferential tissues and a
fistula wall. Elastic and tensile tissues are arranged around
fistula, a lumen and an incision, the
fistula and the lumen are in half-closing state when being not filled by liquid, and the diameters of the fistula and the lumen are smaller than the
diameter of the outer sheath, thus tissues by the side the incision, the fistula wall, the lumen or a
cyst wall surround and extrude the outer sheath so as to realize a seal effect and avoid overflow of internal liquid in the lumen and a
cyst antrum. After the hard lens calculus removing device is guided into the lumen, the inner sheath is pulled out and the outer sheath is reserved. A Y-shaped joint is arranged on the outer sheath, and calculus surged along with water is conveniently discharged into a collection bag through a side hole of the Y-shaped joint. Due to a protection function of the outer sheath, various hard endoscopes, including oledochoscopes, hard lenses or
percutaneous nephroscope set, and
ureteroscope are indirectly in contact with soft tissues by the sides of a
kidney fistula wall and a cholecyst incision, thus the damage on incision circumferential tissues, the fistula wall and a lumen wall due to repeated
insertion and extraction of the endoscopes and devices is basically avoided, and the safety of an operation is improved.