| http://www.w3.org/ns/prov#value | - Additionally, in embodiments wherein distal tip 26 is formed of molded plastic or other non-metallic material, a quantity of radiodense filler such as powdered bismuth or BaSO4 may be disposed within the plastic or other non-metallic material of which distal head 26 is formed so as to impart enhanced radiodensity to distal head 26.
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