Apparatus and construction for intravascular device such as...

G - Physics – 01 – R

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G01R 33/28 (2006.01)

Patent

CA 2565682

An intravascular device includes alternating conductive and dielectric layers and an electrically conductive coil in a configuration that effects an impedance-matching circuit. Another embodiment of an intravascular device has cylindrical inner and outer walls formed of an expandable, electrically conductive material, the inner and outer walls being separated by a compressible dielectric material. Varying the pressure in the lumen defined by the inner wall changes the spacing between the inner and outer walls, thereby changing the capacitance between the inner and outer wall. Another embodiment of an intravascular device includes one or more coaxial chokes for limiting heating caused by currents induced by RF signals. A conductive shield of the choke is formed of a conductive polymer to further reduce heating effects.

L'invention concerne un dispositif intravasculaire comprenant des couches conductrices et diélectriques alternantes et une bobine électriquement conductrice dans une conception produisant un circuit d'appariement d'impédance. Dans un autre mode de réalisation, le dispositif intravasculaire comprend des parois cylindriques interne et externe formées dans un matériau électriquement conducteur expansible, les parois interne et externe étant séparées par un matériau diélectrique compressible. Des variations de pression dans la lumière définie par la paroi interne modifie l'espacement entre les parois interne et externe, modifiant ainsi la capacitance entre les parois interne et externe. Dans un autre mode de réalisation, le dispositif intravasculaire comprend un ou plusieurs étrangleurs coaxiaux permettant de limiter la chaleur engendrée par des courants induits par des signaux RF. Un écran conducteur de l'étrangleur est formé dans un polymère conducteur de manière à réduire encore les effets de la chaleur.

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