Annular ultrasonic transducers in a catheter

A - Human Necessities – 61 – B

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A61B 8/00 (2006.01) A61B 8/08 (2006.01) A61B 8/12 (2006.01)

Patent

CA 2093645

An ultrasonic transducer (11) for use in locating devices with an ultrasonic imaging system which is sensitive over a broad range or angles or incident acoustic beams such as those beams (14) emitted in ultrasonic systems, has a curved surface (21), and is an annular member in shape. The elongated catheter (20) or other device passes through the opening (22) of the annular transducer (11). Based on the shape of such transducers and the wavelength used. the response of the transducers is a function of the angle of the insonifying beam to the catheter axis (r). The particular response of such transducers is shown to depend on the curvature of the annular marker, with the radius of curvature chosen on the basis of the wavelength used in the ultrasonic scanning system between 2-50 wavelengths.

Un transducteur ultrasonique (11), utilisé pour repérer des dispositifs grâce à un système d'imagerie ultrasonique sensible sur une vaste gamme ou angles ou faisceaux acoustiques incidents tels que les faisceaux (14) émis dans les systèmes ultrasoniques, a une surface courbe (21) et est en forme d'anneau. Le cathéter allongé (20) ou autre dispositif passe à travers l'ouverture (22) du transducteur en forme d'anneau (11). Selon la forme des transducteurs et la longueur d'onde utilisée, la réaction des transducteurs dépendra de l'angle que forme le faisceau émetteur d'ultrasons avec l'axe du cathéter (r). Il a été démontré que la réaction particulière de tels transducteurs dépendait de la courbure du marqueur en forme d'anneau, quand le rayon de la courbure est choisie en fonction de la longueur d'onde utilisée dans le système de balayage ultrasonique entre 2-50 longueurs d'onde.

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