Delivery of medical devices

A stent delivery system, comprising:

• a core member having a distal segment;
• a first stent engagement member positioned along the core member distal segment and coupled to the core member, the first engagement member comprising an outer surface comprising a plurality of outwardly projecting protrusions separated by recesses;
• a proximal restraint coupled to the core member at a position proximal to the first engagement member;
• a distal restraint coupled to the core member at a position distal to the first engagement member, wherein the distal restraint has a cross-sectional profile that tapers in the distal direction, wherein the first engagement member is longitudinally slidable over at least a portion of a distance between the proximal restraint and the distal restraint;
• a third restraint disposed proximal to the first engagement member and distal to the proximal restraint;
• a second stent engagement member coupled to the core member and positioned between the proximal restraint and the third restraint, wherein the second stent engagement member is longitudinally slidable over at least a portion of a distance between the proximal restraint and the third restraint;
• and
• a stent extending along the core member distal segment such that an inner surface of the stent is engaged by the first engagement member outer surface for facilitating rotation of the stent relative to the core member.