Asymmetric radiation dosing apparatus and method

A - Human Necessities – 61 – N

Patent

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A61N 5/10 (2006.01)

Patent

CA 2394562

An interstitial brachytherapy apparatus of the invention delivers radioactive emissions in an asymmetric fashion to target tissue surrounding a surgical extraction site. The apparatus includes an expandable outer surface element defining an apparatus spatial volume, a radiation source disposed within the apparatus volume, and a means for providing predetermined asymmetric isodose curves within the target tissue. In one configuration, asymmetric isodose curves are created in the target tissue by shaping or locating the radiation source so as to be asymmetrically placed with respect to a longitudinal axis of the apparatus. In other configurations, asymmetric radiopaque shielding is provided between the radiation source and the target tissue. A surgical procedure using the apparatus is also described.

L'invention concerne un appareil de curiethérapie interstitielle. Cet appareil émet des émissions radioactives de façon asymétrique afin de cibler les tissus entourant un site d'extraction chirurgical. L'appareil comprend un élément de surface extérieure extensible définissant un volume spatial, une source de rayonnements placée dans le volume de l'appareil et un moyen destiné à produire des courbes isodoses asymétriques prédéterminées dans les tissus cibles. Dans un mode de réalisation, on génère des courbes isodoses asymétriques dans les tissus cibles en mettant en forme ou en positionnant la source de rayonnement de façon à ce qu'elle soit placée de manière asymétrique par rapport à un axe longitudinal de l'appareil. Dans d'autres modes de réalisation, un blindage radio-opaque asymétrique est placé entre la source de rayonnement et les tissus cibles. L'invention concerne également une procédure chirurgicale mettant en oeuvre l'appareil.

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