Colloid for scintigraphy

A - Human Necessities – 61 – K

Patent

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A61K 51/12 (2006.01)

Patent

CA 2370409

A new formulation of Tc-99m colloid is described. The new colloid contains a high ratio of perrhenate to thiosulphate, cysteine, and a prepared higher final pH than found previously. In preparing the colloid preferred rhenium sulfide is not used as an ingredient. The pH of the final formulation and can be between about 5.5 an about 8.0, and the ratio of rhenium to sulfur is from about 0.05 to about 1.2. In addition, the new colloid has excellent radiochemical purity, and a much smaller particle size distribution than has generally been previously available for sulfur colloid preparations.

La présente invention concerne une nouvelle formulation de colloïde Tc-99m. Le nouveau colloïde contient une proportion élevée de perrhenate par rapport au thiosulfate, la cystéine, et un pH final de préparation plus élevé que ce qui est connu jusqu'ici. Le sulfure de rhénium n'est pas utilisé comme ingrédient dans le mode de préparation préféré. Le pH de la formulation finale peut être compris entre environ 5.5 et environ 8.0, et le rapport du rhénium au soufre est compris entre environ 0.05 et environ 1.2. Par ailleurs, le nouveau colloïde présente une excellente pureté radiochimique, et une granulométrie nettement inférieure à celle obtenue jusqu'ici pour les préparations de colloïde au soufre.

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