A filter, including a main body part. The main body part includes a heart-proximal end, a plurality of connecting segments, and a first filter mesh connecting between the heart-proximal end and the plurality of connecting segments. An end of the connecting segments that is connected to the first filter mesh is bent towards a central longitudinal axis of the filter to form a bending part. A vertical distance between a proximal end of the bending part and the central longitudinal axis of the filter is less than a vertical distance between a distal end of the bending part and the central longitudinal axis of the filter.
