Stent for expanding body's lumen

A stent for expanding a lumen of a body, the stent being made of a single length of a filament, the stent comprising:

• a body portion formed in such a way that the filament crosses in a spiral pattern to form a plurality of segments with the segments being not engaged with each other;
• and
• upper and lower end portions having a plurality of bent points;
• wherein the number of the bent points of the upper end portion is equal with the number of the bent points of the lower end portion, and any one segment passes alternately on and under other segments which are wound along a longitudinal axis of the stent in a spiral direction so that cross points of the segments form a plurality of meshes.

A stent for expanding a lumen of a body, the stent being made of a single length of filament, the stent comprising:

• zigzag sections, in which the filament is wound in a zigzag manner, disposed on both end portions of the stent;
• and
• a spiral section, in which the filament is wound in a spiral manner, disposed between the zigzag sections, the spiral section including,
• a body portion formed in such a way that the filament crosses in a spiral pattern to form a plurality of unengaged segments, and
• upper and lower end portions having a plurality of bent points.

A stent for expanding a lumen of a body, comprising:

• bands constructed from a single length of a filament;
• each of the bands including alternate peaks and valleys;
• and
• each peak of one band being twisted together with a single respective valley of an adjacent band.