English to Russian Medical Medical (general) nephrology

Once uroliths have been shattered such that they are small enough to pass through the urethra, fragments can be removed by a variety of methods. Larger fragments are initially removed with a stone basket to verify that the size is sufficiently small to allow removal by antegrade voiding.
Что означает stone basket? Как я понимаю, это конечная часть инструмента, при помощи которой камень выводится наружу. Как называется эта часть?