Ablation device with spiral array ultrasound transducer

A - Human Necessities – 61 – B

Patent

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Details

A61B 18/18 (2006.01)

Patent

CA 2533537

The present invention relates to a device assembly and tissue ablation transducer (400) having a plurality of helical elements that can be operated out of phase to orient the acoustical energy beam forward or backward in the longitudinal direction. The transducers includes a cylindrical inner electrode (402), a cylindrical piezoelectric (403) material disposed over the inner electrode, and a cylindrical outer electrode (404) disposed over the cylindrical piezoelectric material. Spiral grooves (figure 4a) are cut through at least the outer electrode separating the transducer into a plurality of functionally discrete helical transducer segments. The helical transducer segments can be operated independent from one another. An array of intertwined helical transducers arranged linearly along a helical axis are also contemplated.

L'invention concerne un ensemble de dispositif et un transducteur d'ablation de tissu comprenant une pluralité d'éléments hélicoïdaux pouvant être mis en oeuvre hors phase afin d'orienter le faisceau d'énergie acoustique en avant ou en arrière dans la direction longitudinale. Les transducteurs comprennent une électrode interne cylindrique, un matériau piézo-électrique cylindrique disposé sur l'électrode interne et une électrode externe cylindrique disposée sur le matériau piézo-électrique cylindrique. Des rainures en spirale sont découpées dans au moins l'électrode externe, afin de séparer le transducteur en une pluralité de segments hélicoïdaux à fonctionnalité distincte. Ceux-ci peuvent être mis en oeuvre indépendamment les uns des autres. L'invention concerne enfin un réseau de transducteurs hélicoïdaux à entrelacement disposés de manière linéaire le long d'un axe hélicoïdal.

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