Grasper and repository for removal of multiple kidney stone fragments

A medical instrument for removing a kidney stone from a urinary tract of a patient body, comprising:

• a flexible elongate shaft defining a proximal end and a distal end, the flexible elongate shaft configured for insertion within the urinary tract;
• and
• a retaining mechanism coupled with the flexible elongate shaft at the distal end, the retaining mechanism configured to retain a plurality of stone fragments within a container thereof, wherein:
• the container comprises an entryway for the plurality of stone fragments to enter the container,
• the entryway is transitionable between:
• an open state allowing passage of fragments therethrough, and
• a closed state inhibiting passage of fragments therethrough, and
• the entryway is configured to transition from the closed state to the open state by one or more of the plurality of stone fragments as the one or more of the plurality of stone fragments are moved into the retaining mechanism.