Patent ID: 8246648

Claim:
A removable filter for capturing thrombi in a blood vessel, the filter comprising: a plurality of primary struts having first ends attached together along a longitudinal axis of the filter, each primary strut having a body member extending from the first end along the longitudinal axis to an anchoring hook at a terminal end of the primary strut, the body member having a proximal portion and a distal portion, each primary strut being configured to move relative to the longitudinal axis between an expanded state for engaging with the blood vessel and a collapsed state for filter delivery or retrieval, at least one primary strut having first and second bends proximate the anchoring hook, the first bend being disposed distally to the second bend, the distal portion of the body member extending from the first bend to the anchoring hook, the first bend having a first concave side and a first convex side, the second bend having a second concave side and a second convex side, the body member having an outer side that faces away from the longitudinal axis in the expanded state, the first convex side of the first bend extending from the outer side of the body member and away from the longitudinal axis, the second concave side of the second bend being disposed on the outer side of the body member, a substantial portion of the outer side of the distal portion of the body member being substantially tangent to the first convex side of the first bend, the first convex side of the first bend being configured to contact the blood vessel in the expanded state; and a plurality of secondary struts having proximal ends attached together along the longitudinal axis and distal ends located radially from the longitudinal axis in the expanded state, the plurality of secondary struts being configured to engage the blood vessel to centralize the filter in the expanded state in the blood vessel.