Disclosed are filters (100, 200, 300), comprising main bodies (10, 20, 30) with proximal ends (101, 201, 301) and telecentric ends (102, 202, 302). The main bodies (10, 20, 30) comprise first filter nets (11, 21, 31) located between the proximal ends (101, 201, 301) and the telecentric ends (102, 202, 302) and adjacent to the proximal ends (101, 201, 301), and a plurality of first support rods (131, 231, 331) connected to the first filter nets (11, 21, 31) and located between the first filter nets (11, 21, 31) and the telecentric ends (102, 202, 302). The first support rods (131, 231, 331) generally extend in a direction parallel to the longitudinal central axis of the filters (100, 200, 300). The ratio of the projection length of each first support rod (131, 231, 331) in the plane parallel to the longitudinal central axis of the filters (100, 200, 300) and the natural length of the filters (100, 200, 300) is greater than or equal to 1/11 and less than or equal to 3/4. After being naturally released, the filters (100, 200, 300) can be stably and reliably placed in a blood vessel and are not prone to tilting, and the removal of the filters (100, 200, 300) causes a relatively small amount of damage to the inner wall of the blood vessel.La présente invention concerne des filtres (100, 200, 300), comprenant des corps principaux (10, 20, 30) avec des extrémités proximales (101, 201, 301) et des extrémités télécentriques (102, 202, 302). Les corps principaux (10, 20, 30) comprennent des premières grilles de filtre (11, 21, 31) situées entre les extrémités proximales (101, 201, 301) et les extrémités télécentriques (102, 202, 302) et adjacentes aux extrémités proximales (101, 201, 301), une pluralité de premières tiges de support (131, 231, 331) raccordées aux premières grilles de filtre (11, 21, 31) et situées entre les premières grilles de filtre (11, 21, 31) . et les extrémités télécentriques (102, 202, 302). Les premières tiges de support (131, 231, 331) sétendent géné
