| http://www.w3.org/ns/prov#value | - This may be particularly advantageous if it is desired to leave the filter 1 in place in a vasculature for a long period of time, for example overnight, to assist in vascular recovery. [0475] The filter body 2 may have a low-friction outer layer, for example a hydrophilic coating, to minimise frictional resistance during deployment and retrieval of the filter 1, and the filter body 2 may be of an
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