Patent ID: 8246650

Claim:
A removable filter for capturing thrombi in a blood vessel, the filter comprising: a plurality of primary struts having first ends connected to each other to define a central axis of the filter, each primary strut having a curved member extending from the central axis and terminating at an anchoring hook to engage the blood vessel at a first axial plane, each curved member having a first curved portion configured to bend away from the central axis in a single curve along the length of each curved member and a second curved portion configured to bend toward the central axis along the length of each curved member; and a plurality of secondary struts connected to and contacting the curved members of the primary struts, the secondary struts extending from the curved members and bending away from the central axis to free ends at a second axial plane to centralize the filter in the blood vessel, each free end not contacting the plurality of primary struts, the primary and secondary struts forming a minimal diameter defining a collapsed configuration of the filter and a maximum diameter defining an expanded configuration of the filter, each secondary strut being formed of a single curve and being secured to one of the first curved portions, each secondary strut contacting only one primary strut in the expanded configuration.