BAND STOP FILTER EMPLOYING A CAPACITOR AND AN INDUCTOR TANK CIRCUIT TO ENHANCE MRI COMPATIBILITY OF ACTIVE MEDICAL DEVICES
First Claim
1. A medical diagnostic or therapeutic device, comprising:
- a medical device including lead wire extending therefrom and in 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, 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.
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Accused Products
Abstract
A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device.
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Citations
59 Claims
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1. A medical diagnostic or therapeutic device, comprising:
- a medical device including lead wire extending therefrom and in 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, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- a medical device including lead wire extending therefrom and in contact with biological cells; and
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15-42. -42. (canceled)
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43. A medical diagnostic or therapeutic device, comprising:
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a medical device including a probe or catheter having TIP, RING or PAD electrodes in contact with biological cells; and a band stop filter associated with the catheter or probe electrodes, for attenuating current flow through the probe or catheter at a selected frequency, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the probe or catheter electrode, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at the selected frequency, and wherein the overall Q of the band stop filter is reduced to attenuate current flow through the lead wire along a range of selected frequencies. - View Dependent Claims (44, 45, 46, 47, 48)
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49. A medical diagnostic or therapeutic device, comprising:
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a medical device and an implantable lead wire extending therefrom and adapted to be in 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, 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 along a range of selected frequencies. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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Specification