Provided is a filter (100, 100a, 100b), comprising a main-body part (10, 10a, 10b) having a proximal end (101, 101a, 101b) and a distal end (102, 102a, 102b)； the main-body part (10, 10a, 10b) comprises a first filtration mesh (11, 11a, 11b) located between the proximal end (101, 101a, 101b) and the distal end (102, 102a, 102b) and adjacent to the proximal end (101, 101a, 101b), and a support segment (13, 13a, 13b) connected to the first filtration mesh (11, 11a, 11b) and located between the first filtration mesh (11, 11a, 11b) and the distal end (102, 102a, 102b)； the support segment (13, 13a, 13b) comprises a plurality of first support bars 131, 131a, 131b)； the first support bars (131, 131a, 131b) extend approximately lengthwise along the central axis parallel to the filter (100, 100a, 100b)； the ratio of the length of the projection of each first support bar (131, 131a, 131b) in the plane of the longitudinal central axis parallel to the filter (100, 100a, 100b) to the outer diameter corresponding to the support segment (13, 13a, 13b) after the filter (100, 100a, 100b) is naturally released is greater than or equal to 1/10 and is smaller than or equal to 4/5. The filter (100, 100a, 100b) ensures that the stability of the filter (100, 100a, 100b) after implantation into a blood vessel is good, and also ensures that when the filter (100, 100a, 100b) is removed after having been implanted for a period of time, no damage is caused to the inside wall of the blood vessel.L'invention concerne un filtre (100, 100a, 100b), comprenant une partie de corps principal (10, 10a, 10b) comportant une extrémité proximale (101, 101a, 101b) et une extrémité distale (102, 102a, 102b)； la partie de corps principal (10, 10a, 10b) comprend un premier tamis de filtration (11, 11a, 11b) situé entre l'extrémité proximale (101, 101a, 101b) et l'extrémité distale (102, 102a, 102b) et adjacent à l'extrémité proximale (101, 101a, 101b), et un segment de support (13, 13a, 13b) relié au premier
