System and method for eliminating cross-talk due to far-field signals
First Claim
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1. A method for operating a cardiac rhythm management device, comprising:
- sensing right and left ventricles through separate channels and generating ventricular sense signals upon detection of depolarization occurring in a ventricle;
pacing a ventricle upon expiration of a ventricular escape interval without receipt of a right ventricular sense signal from the right ventricle sensing channel;
rendering the left ventricular sensing channel refractory for a specified time interval in order to avoid sensing both a far-field right ventricular signal and a left ventricular depolarization during the same cardiac cycle.
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Abstract
A method and system for reducing the effects of far-field signals in a cardiac rhythm management device. Such far-field signals can be produced by contralateral ventricular depolarization and can cause cross-talk between ventricular sensing channels.
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Citations
25 Claims
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1. A method for operating a cardiac rhythm management device, comprising:
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sensing right and left ventricles through separate channels and generating ventricular sense signals upon detection of depolarization occurring in a ventricle;
pacing a ventricle upon expiration of a ventricular escape interval without receipt of a right ventricular sense signal from the right ventricle sensing channel;
rendering the left ventricular sensing channel refractory for a specified time interval in order to avoid sensing both a far-field right ventricular signal and a left ventricular depolarization during the same cardiac cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
wherein the left ventricular protection period is triggered by a depolarization detected in the left ventricular sensing channel during both refractory and non-refractory periods.
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4. The method of claim 1 wherein a right ventricular sense triggers a left ventricular refractory period.
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5. The method of claim 1 wherein a left ventricular sense triggers a left ventricular refractory period.
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6. The method of claim 4 wherein the left ventricle is paced upon expiration of a ventricular escape interval without receipt of a right ventricular sense signal from the right ventricle sensing channel, unless the pace would occur within a left ventricular protection period beginning after receipt of a left ventricular sense signal in which case no left ventricular pace is delivered;
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wherein the left ventricular protection period is triggered by a depolarization detected in the left ventricular sensing channel during both refractory and non-refractory periods.
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7. The method of claim 4 wherein the left ventricle is paced upon expiration of a ventricular escape interval without receipt of a right ventricular sense signal from the right ventricle sensing channel, unless the pace would occur within a left ventricular protection period in which case no left ventricular pace is delivered;
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wherein the left ventricular protection period is triggered by either a left ventricular or a right ventricular sense.
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8. A method for operating a cardiac rhythm management device, comprising:
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sensing a first heart chamber and a second heart chamber contralateral to the first chamber through separate channels and generating separate sense signals upon detection of depolarization occurring in a chamber;
rendering a sensing channel refractory for a specified time interval in order to avoid sensing depolarizations from both chambers during the same cardiac cycle; and
,wherein the first chamber is sensed with a bipolar lead in order to reduce the sensing of far-field signals due to depolarizations in the second chamber. - View Dependent Claims (9, 10)
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11. A method for operating a cardiac rhythm management device, comprising:
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sensing a first heart chamber and a second heart chamber contralateral to the first chamber through separate channels and generating separate sense signals upon detection of depolarization occurring in a chamber;
rendering a sensing channel refractory for a specified time interval in order to avoid sensing depolarizations from both chambers during the same cardiac cycle; and
,wherein the first chamber is sensed with a unipolar lead in which an electrode of the lead is referenced to a housing structure in order to reduce the sensing of far-field signals due to depolarizations in the second chamber. - View Dependent Claims (12, 13, 14)
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15. A cardiac rhythm management device, comprising:
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right and left ventricular sensing channels for sensing right and left ventricular depolarizations and generating ventricular sense signals in accordance therewith;
a pacing channel for delivering pacing pulses to a ventricle;
a controller for controlling the delivery of paces in accordance with a programmed pacing mode;
wherein the controller is programmed to render the left ventricular sensing channel refractory for a specified time interval in order to avoid sensing both a far-field right ventricular signal and a left ventricular depolarization during the same cardiac cycle. - View Dependent Claims (16, 17, 18, 19, 20, 21)
wherein the left ventricular protection period is triggered by a depolarization detected in the left ventricular sensing channel during both refractory and non-refractory periods.
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18. The device of claim 15 wherein a right ventricular sense triggers a left ventricular refractory period.
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19. The device of claim 18 wherein a left ventricular sense triggers a left ventricular refractory period.
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20. The device of claim 18 wherein the controller is programmed to pace the left ventricle upon expiration of a ventricular escape interval without receipt of a right ventricular sense signal from the right ventricle sensing channel, unless the pace would occur within a left ventricular protection period beginning after receipt of a left ventricular sense signal in which case no left ventricular pace is delivered;
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wherein the left ventricular protection period is triggered by a depolarization detected in the left ventricular sensing channel during both refractory and non-refractory periods.
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21. The device of claim 18 wherein the controller is programmed to pace the left ventricle upon expiration of a ventricular escape interval without receipt of a right ventricular sense signal from the right ventricle sensing channel, unless the pace would occur within a left ventricular protection period in which case no left ventricular pace is delivered;
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wherein the left ventricular protection period is triggered by either a left ventricular or a right ventricular sense.
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22. A method for operating a cardiac rhythm management device, comprising:
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sensing a first heart chamber and a contralateral second heart chamber through separate sensing channels; and
,rendering a sensing channel refractory for a specified time interval in order to avoid sensing depolarizations from both chambers during the same cardiac cycle. - View Dependent Claims (23, 24, 25)
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Specification