| http://www.w3.org/ns/prov#value | - A vessel filter comprising a body made from a single tube, the tube having a longitudinal axis and cut to create a plurality of elongated struts, the tube further including a tubular region proximal of the struts and having a cut therein to form a radial spacer, the radial spacer extending substantially parallel to the longitudinal axis of the tube and distally beyond the tubular region in the col
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