| http://www.w3.org/ns/prov#value | - At least the tapered distal portion 16 of the helical coil 14 and preferably the entire length of coil 14 has a polymer coating or layer 20, which may be applied by spray coating, dip coating or other suitable means, to either encapsulate the tapered distal coil portion 16 or to at least bridge the turns of the tapered portion of the coils.
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