Methods and medical elongate bodies

A method for smoothening a rugged blood vessel inner wall surface at a lesion site of the blood vessel so that a through lumen possessing a smoothened inner surface exists in the blood vessel at the lesion site, thereby inhibiting or preventing stagnation or turbulence of blood flow due to the rugged blood vessel inner wall surface at the lesion site, the rugged blood vessel inner wall surface including a plurality of spaced-apart recesses in the blood vessel, the method comprising:

• moving a catheter in the blood vessel to position a distal portion of the catheter adjacent the rugged blood vessel inner wall surface at the lesion site;
• ejecting gel from the distal portion of the catheter while the distal portion of the catheter is positioned adjacent the rugged blood vessel inner wall surface to deliver the gel into the blood vessel;
• filling at least one of the recesses with the gel;
• removing the catheter from the blood vessel after filling the at least one recess with the gel;
• the removing of the catheter from the blood vessel occurring while the at least one recess remains filled with the gel;
• providing the through lumen in the blood vessel so that the through lumen extends from upstream of the gel to downstream of the gel to allow the blood in the blood vessel upstream of the gel to flow past the gel, the forming of the through lumen in the blood vessel including drilling the gel that has filled the at least one recess to remove at least some of the gel filling the at least one recess and form the through lumen in the blood vessel possessing the smoothened inner surface, the through lumen with the smoothened inner surface possessing an inner diameter that varies along a longitudinal extent of the blood vessel;
• detecting both blood pressure on an upstream side of the rugged blood vessel inner wall surface and blood pressure on a downstream side of the rugged blood vessel inner wall surface to identify the side on which the blood pressure is higher;
• and
• the inner diameter of the lumen with the smoothened surface increasing toward the side on which the blood pressure is higher.