A method involves introducing a raking part into a lumen in an ureteral access sheath in which is located calculus, wherein the raking part is introduced into the ureteral access sheath while at least a part of the ureteral access sheath is located in a living body. The raking part is moved in the ureteral access sheath toward the calculus and is positioned beyond the calculus. The lumen in the ureteral access sheath is at least partially occluded by way of the raking part. After at least partially occluding the lumen in the ureteral access sheath by way of the raking part, the raking part is moved along the lumen in the ureteral access sheath in a direction opposite the first direction so that the raking part rakes out the calculus.
