| http://www.w3.org/ns/prov#value | - In a preferred embodiment, the elongated support is tubular and serves as an infusion tube that extends distally from the apex of the filter element to enable a contrast medium or drug or other liquid to be injected into the vena cava just distally of (that is, upstream from) the apex of the filter element so that the fluid immediately encounters any captured blood clots and enables them to be vis
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