Method and apparatus for terminating tachycardia
First Claim
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1. An implantable cardioverter, comprising:
- first electrode means for sensing signals from a chamber of a heart indicative of depolarizations of said chamber of said heart;
second electrode means for sensing signals from said chamber of said heart indicative of depolarizations of said chamber of said heart;
first detecting means coupled to said first electrode means for detecting the occurrence of a first event within a said signal from said chamber of said heart indicative of a depolarization of said chamber of said heart;
second detecting means coupled to said second electrode means for detecting the occurrence of a second event within a said signal from said chamber of said heart indicative of a depolarization of said chamber of said heart;
means for measuring a time differential between the occurrences of said first and second events;
means for defining a cardioversion pulse delay as a function of said measured time differential;
means for initiating timing of a said cardioversion pulse delay upon the occurrence of a said second event; and
means for delivering a cardioversion pulse to said heart upon the expiration of a said cardioversion pulse delay.
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Abstract
An implantable cardioverter including two electrodes for sensing depolarizations of a chamber of a patient'"'"'s heart, one electrode providing a near field signal, one electrode providing a far field signal. The device defines a desired cardioversion pulse delivery time as a first time interval following the onset of the far field signal. The device measures a second time interval between the onset of the far field signal and the detection of the near field signal, and delivers the cardioversion pulse synchronized to the detection of the near field signal, using the first and second time intervals to define a synchronization interval following detection of the near field electrogram.
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Citations
22 Claims
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1. An implantable cardioverter, comprising:
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first electrode means for sensing signals from a chamber of a heart indicative of depolarizations of said chamber of said heart; second electrode means for sensing signals from said chamber of said heart indicative of depolarizations of said chamber of said heart; first detecting means coupled to said first electrode means for detecting the occurrence of a first event within a said signal from said chamber of said heart indicative of a depolarization of said chamber of said heart; second detecting means coupled to said second electrode means for detecting the occurrence of a second event within a said signal from said chamber of said heart indicative of a depolarization of said chamber of said heart; means for measuring a time differential between the occurrences of said first and second events; means for defining a cardioversion pulse delay as a function of said measured time differential; means for initiating timing of a said cardioversion pulse delay upon the occurrence of a said second event; and means for delivering a cardioversion pulse to said heart upon the expiration of a said cardioversion pulse delay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of cardioversion, comprising:
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employing a first electrode means for sensing signals from a chamber of a heart indicative of depolarizations of said chamber of said heart; employing a second electrode means for sensing signals from said chamber of said heart indicative of depolarizations of said chamber of said heart; detecting the occurrence of a first event within a said signal from said first electrode means indicative of a depolarization of said chamber of said heart; detecting the occurrence of a second event within a signal from said second electrode means indicative of a depolarization of said chamber of said heart; measuring a time differential between the occurrences of said first and second events; defining a cardioversion pulse delay as a function of said measured time differential; initiating timing of a said cardioversion pulse delay upon the occurrence of a said second event; and delivering a cardioversion pulse to said heart upon the expiration of a said cardioversion pulse delay. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A cardioverter, comprising:
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means for sensing far-field signals indicative of the depolarizations of a chamber of a heart; means for measuring the point of onset of a said far-field signal; means for detecting near-field signals indicative of depolarizations of said chamber of said heart; means for measuring a time differential between the point of onset of a said far-field signal and the detection of a said near-field signal and for defining a delay interval as a function thereof; means for initiating said delay interval in response to detection of a said near field signal; and means for generating a cardioversion pulse on expiration of said delay interval.
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22. A method of cardioverting a heart, comprising:
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sensing far-field signals indicative of the depolarizations of a chamber of a heart; measuring the point of onset of a said far-field signal; detecting near-field signals indicative of depolarizations of said chamber of said heart; measuring a time differential between the point of onset of a said far-field signal and the detection of a said near-field signal and defining a delay interval as a function thereof; initiating said delay interval in response to detection of a said near field signal and; generating a cardioversion pulse on expiration of said delay interval.
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Specification