A negative-pressure suction adjustment device used in a technology for extracting calculuses by using a trans-sheath endoscope comprises a housing (1). An endoscope inlet (12), a sheath canal installation opening (11) and a negative-pressure introducing opening (13) are formed in the housing and a negative-pressure adjustment mechanism (2) that is communicated with a cavity of the housing is also disposed on the housing. By means of the negative-pressure suction adjustment device, an operator can directly and accurately set and control negative-pressure suction force to be at a reasonable value, and the situations, such as aggravation of renal hemorrhage due to an excessively high negative pressure, unsmoothness of drainage due to an excessively low negative pressure, failure to maintain a renal low-pressure state and failure to suck out broken calculuses, can be avoided. Accordingly the negative-pressure drainage condition in a sheath canal can be directly observed, and the situations, such as the blocking of a drainage channel in the sheath canal due to broken calculuses and blood clots, can be found and handled in time a central negative-pressure suction source commonly used in an operating room can be directly used, without requiring a special negative-pressure control and monitoring device. The negative-pressure suction adjustment device is applicable to peeling sheaths of various calibers, ureter passing sheaths of various calibers and various soft and hard endoscopes the device is small and exquisite, has a simple structure, is convenient to use and has low cost.La présente invention concerne un dispositif de réglage daspiration sous pression négative utilisé dans une technologie permettant dextraire des calculs à laide dun endoscope à gaine transseptale, ledit dispositif comprenant un boîtier (1). Un orifice dentrée dendoscope (12), une ouverture dinstallation de canal de gaine (11) et une ouverture dintroduction de pression négative (13) sont formés dans le
