Patent ID: 7138106

Claim:
A composition comprising: (a) from about 2.5 to about 8.0 weight percent of a polymer selected from the group consisting of polyvinylacetate, cellulose acetate butyrate, nitrocellulose and copolymers of urethane/carbonate and copolymers of styrene/maleic acid, and mixtures thereof wherein said polymer has a molecular weight of at least 50,000; (b) from about 10 to about 40 weight percent of a contrast agent wherein said contrast agent is selected from the group consisting of gold, tungsten and platinum powder; (c) from about 52 to about 87.5 weight percent of dimethylsulfoxide which solubilizes said polymer; and wherein the weight percent of the polymer, contrast agent and biocompatible solvent is based on the total weight of the complete composition.