A filter (100), comprising a main body part (1). The main body part (1) comprises a heart-proximal end (11), a plurality of connecting segments (132), and a first filter mesh (131) connecting between the heart-proximal end (11) and the plurality of connecting segments (132). An end of the connecting segments (132) that is connected to the first filter mesh (131) is bent towards a central longitudinal axis of the filter (100) to form a bending part (1321). A vertical distance (h1) between a proximal end of the bending part (1321) and the central longitudinal axis of the filter (100) is less than a vertical distance (h2) between a distal end of the bending part (1321) and the central longitudinal axis of the filter (100). The filter (100) is provided with the bending part (1321) by bending of the ends of the connecting segments (132) that are connected to the first filter mesh (131) toward the central longitudinal axis of the filter (100), allowing a surface of the first filter mesh (131) to be away from a surface of a blood vessel so as to avoid contacting an inner wall of the vessel when the first filter mesh (131) is retracted. The bending part (1321) can bear a portion of stress, thereby preventing stress from concentrating on a connection between the first filter mesh (131) and the connecting segments (132).La présente invention concerne un filtre (100), comprenant une partie de corps principal (1). La partie de corps principal (1) comprend une extrémité proximale vis-à-vis du cœur (11), une pluralité de segments de liaison (132), et un premier maillage de filtre (131) établissant une liaison entre l'extrémité proximale vis-à-vis du cœur (11) et la pluralité des segments de liaison (132). Une extrémité des segments de liaison (132) qui est reliée au premier maillage de filtre (131) est fléchie vers un axe longitudinal central du filtre (100) pour former une partie de flexion (1321). Une distance verticale (h1) entre une extrémité proximale de la partie de flexion
