Hybrid sleeve material and structure

A stent delivery system comprising:

• a catheter including a stent mounting region;
• a stent disposed about the stent mounting region of the catheter, the stent having a distal end and a proximal end, the stent further having an unexpanded state and an expanded state, and
• at least one stent retaining sleeve, the at least one stent retaining sleeve having an inside surface and an outside surface and a first end and a second end,
• the first end overlying an end of the stent when the stent is in the unexpanded state, the second end engaged to at least a portion of the catheter adjacent to the stent mounting region;
• the outside surface being composed of a first material, at least a portion of the first end of the inside surface being composed of a second material;
• the first material having a first predetermined hardness, the second material having a second predetermined hardness, the second predetermined hardness having a higher durometer value than the first predetermined hardness
• wherein the first material and the second material are co-extruded.

A stent delivery system comprising:

• a catheter including a stent mounting region;
• a stent disposed about the stent mounting region of the catheter, the stent having a distal end and a proximal end, the stent further having an unexpanded state and an expanded state, and
• at least one stent retaining sleeve, the at least one stent retaining sleeve having a first end and a second end, the first end overlying an end of the stent when the stent is in the unexpanded state, the second end engaged to at least a portion of the catheter adjacent to the stent mounting region;
• the at least one sleeve having an inside surface and an outside surface, the entire inside surface being harder than the outside surface.