A stent delivery system can include a core assembly sized for insertion into a corporeal lumen and configured for advancing a stent toward a treatment location in the corporeal lumen. The core assembly can include a longitudinally extending tube having a lumen and a helical cut extending along the tube. An elongate wire can extend through the tube lumen. The wire can have an intermediate portion disposed distal to the tube. The system can also include a stent carried by the intermediate portion.
