MRI shielding in electrodes using AC pacing
First Claim
1. A medical device, comprising:
- a pulse generator;
an electrode configured to contact tissue in a coronary vessel;
a lead comprising a lead conductor, the lead conductor connecting the pulse generator with the electrode; and
a filter circuit electrically connected in series between the lead conductor and the electrode, the filter circuit comprising a band pass filter;
wherein the band pass filter attenuates signals having a frequency other than a natural resonance frequency, and wherein the pulse generator transmits signals as a sinusoidal voltage wave at about the natural resonance frequency; and
wherein the filter circuit further comprises a rectifier circuit, and wherein the rectifier curcuit rectifies the sinusoidal voltage wave before the rectified sinusoidal voltage wave passes to the electrodes.
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Accused Products
Abstract
A medical device includes a pulse generator, an electrode configured to contact tissue in a coronary vessel, a lead comprising a lead conductor, the lead conductor connecting the pulse generator with the electrode, and a filter circuit electrically connected in series between the lead conductor and the electrode. The filter circuit may include a band pass filter that attenuates signals having a frequency other than a natural resonance frequency (e.g. MRI device signals), and the pulse generator may transmit therapy signals to the electrode as a sinusoidal voltage wave at the natural resonance frequency. The filter circuit may include a diode that rectifies the sinusoidal voltage wave before the rectified sinusoidal voltage wave passes to the electrode. In some embodiments, therapy signals may be provided to the electrode through the band pass filter over a natural resonance frequency range.
94 Citations
21 Claims
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1. A medical device, comprising:
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a pulse generator; an electrode configured to contact tissue in a coronary vessel; a lead comprising a lead conductor, the lead conductor connecting the pulse generator with the electrode; and a filter circuit electrically connected in series between the lead conductor and the electrode, the filter circuit comprising a band pass filter; wherein the band pass filter attenuates signals having a frequency other than a natural resonance frequency, and wherein the pulse generator transmits signals as a sinusoidal voltage wave at about the natural resonance frequency; and wherein the filter circuit further comprises a rectifier circuit, and wherein the rectifier curcuit rectifies the sinusoidal voltage wave before the rectified sinusoidal voltage wave passes to the electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical device, comprising:
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an electrode configured to contact tissue in a coronary vessel; a lead comprising a lead conductor, the lead conductor electrically connecting to the electrode and configured to electrically connect to a pulse generator; and a filter circuit electrically connected in series between the lead conductor and the electrode, the filter circuit comprising a band pass filter; wherein the band pass filter attenuates signals having a frequency other than a natural resonance frequency, and wherein the lead conductor receives transmissions of signals from the pulse generator as a sinusoidal voltage wave at about the natural resonance frequency; and wherein the filter circuit comprises a rectifier circuit, and wherein the rectifier circuit rectifies the sinusoidal voltage wave before the rectified sinusoidal voltage wave passes to the electrode. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A medical device, comprising:
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a pulse generator; an electrode configured to contact tissue in a coronary vessel; a lead comprising a lead conductor, the lead conductor electrically connecting the pulse generator with the electrode; and a filter circuit electrically connected in series between the lead conductor and the electrode, the filter circuit comprising a band pass filter; wherein the pulse generator is configured to transmit a signal to the electrode through the band pass filter at a frequency within a natural resonance frequency range of the band pass filter, and wherein the band pass filter is configured to shield the electrode from signals with frequencies outside of the natural resonance frequency range; and wherein the filter circuit further comprises a rectifier circuit, and wherein the rectifier circuit rectifies the signal from the pulse generator before the rectified signal passes to the electrode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification