| http://www.w3.org/ns/prov#value | - Additionally, in embodiments wherein the distal head 34 is formed of molded plastic or other non-metallic material, a quantity of radiodense fillers, such as powdered Bismuth or Barium Sulfate (BaSO4) may be disposed within the plastic or other nonmetallic material of which the distal head 34 is formed so as to impart enhanced radiodensity thereto.
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