A permanent blood clot filter which may be retrieved is provided. The blood clot filter includes a filter section and an alignment section. The filter section includes a filter hub and a set of filter legs whose downstream ends are connected to the filter hub. The filter legs extend axially and radially...http://www.google.com/patents/US20060079928?utm_source=gb-gplus-sharePatent US20060079928 - Permanent blood clot filter with capability of being retrieved
