MRI COMPATIBLE MEDICAL LEADS WITH BAND STOP FILTERS
First Claim
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1. An MRI compatible medical diagnostic or therapeutic device, comprising:
- a medical device including a lead wire extending therefrom, the device adapted for contact with biological cells; and
a band stop filter associated with the lead wire for attenuating current flow through the lead wire at a selected frequency or frequency band, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the lead wire, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at the selected frequency or frequency band.
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Abstract
Herein is disclosed an MRI compatible medical lead with band stop filters in communication with a respective lead conductor and electrode tuned to resonate at selected (MRI) high frequencies.
205 Citations
11 Claims
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1. An MRI compatible medical diagnostic or therapeutic device, comprising:
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a medical device including a lead wire extending therefrom, the device adapted for contact with biological cells; and a band stop filter associated with the lead wire for attenuating current flow through the lead wire at a selected frequency or frequency band, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the lead wire, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at the selected frequency or frequency band. - View Dependent Claims (2, 3)
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4. A process for attenuating current flow through a lead wire for a medical device at a selected frequency, comprising the steps of:
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selecting a capacitor which is resonant at the selected frequency;
selecting an inductor which is resonant at the selected frequency;using the capacitor and the inductor to form a tank filter circuit; and placing the tank filter circuit in series with the lead wire. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A medical device comprising:
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a probe or catheter having electrodes adapted to contact biological cells and at least one conductor in communication with each electrode; and at least one band stop filter associated with the electrodes for attenuating current flow through the probe or catheter at a selected frequency or frequency range, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with at least one of the electrodes, wherein the band stop filter is resonant at the selected frequency or frequency range, and wherein the band stop filter is configured to attenuate current flow through the conductors at the selected frequency or frequency range. - View Dependent Claims (11)
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Specification