Catheter for removing calculus from the kidneys or urethra

摘要

1. A catheter for removing calculus from the kidneys or urethra, said catheter being formed by a guide tube in whichc at least one filament is guided so as to be longitudinally slidable to form a noose for gripping a calculus from behind, the guide tube having at the inner end at least one exit for a filament, characterized in that one end of each filament (5, 5a, 5b) is fastened to the guide tube (4) in a spaced, stagered relationship to its exit (8, 8a) so that as a filament is longitudinally slid it forms a noose (9).