title: Removal of an entangled monofilament with a Chiba needle.
abstract: A monofilament which has become entangled during an interventional procedure may be cut free by advancing a catheter over the free ends and sliding a 22 gauge Chiba needle over the monofilament. When the knot is encountered, the sharp tip of the Chiba needle cuts and releases the monofilament.
mesh_terms: D006801:Humans; D007682:Kidney Pelvis; D009339:Needles; D019736:Prostheses and Implants; D014513:Ureter; D014546:Urinary Catheterization / Q000009:adverse effects / Q000379:methods*