| 摘要 |
PATENT SPECIFICATION EXTRACTING DEVICE FOR REMOVING OBJECTS FROM HUMAN BODY PASSAGES The extracting device is particularly useful for removing kidney stones from the urinary tract, but may also be used for removing other objects from other body passages, some of which, such as blood vessels, may be reached through incisions. For example, the device may be employed for removing gallstones through a drainage tube after gallbladder surgery. Other uses include the removal of foreign objects from the respiratory tract or the esophagus. The disclosed device comprises an outer flexible tube which is insertable into a body passage, an inner flexible tube slideably received within the outer tube for free longitudinal movement, and a thin highly flexible and limp sleeve, made of rubber or the like, connected between the insertable ends of the outer and inner tubes. The sleeve is inflatable by air or other fluid pressure, transmitted along the clearance space between the tubes, so as to dilate the body passage. Suction may then be transmitted through the inner tube for capturing the kidney stone or other object to be removed from the body passage. The inner tube is then retracted to pull the object within the confines of the flexible sleeve, which is preferably simultaneously deflated so that the sleeve enfolds the object. The tubes may then be withdrawn to remove the object from the body passage. A manipulator is preferably connected to the free ends of the tubes to make it easy for the operator to extend and retract the inner tube with the fingers of one hand. The other hand may then be used to - i operate control valves for selectively supplying pressure to inflate the sleeve and suction to capture the desired object. In a modified embodiment, a snare is employed adjacent the free end of the sleeve to assist in capturing the object. The snare is provided with an operating wire or the like, slideably received within the inner tube. In other modifications, one or more auxiliary tubes may be slideably mounted within the inner tube, or may be inserted into the body passage along with the outer tube, to afford auxiliary communication with the body passage for the insertion or withdrawal of one or more fluids. If desired, the auxiliary tube may have a plurality of tube elements affording a plurality of separate passages. - ii |
