Impedance waveform monitoring for heart beat confirmation
First Claim
1. A method of operation in an implantable cardiac stimulus device having operational circuitry for monitoring and analyzing cardiac signals and a plurality of electrodes including at least two electrodes configured for current injection and at least two electrodes configured for electrical monitoring of voltage resultant from the injected current to allow the operational circuitry to generate an impedance waveform for monitoring purposes, the method comprising:
- the operational circuitry injecting current using the at least two electrodes configured for current injection and sensing resultant voltage using the at least two electrodes configured for electrical monitoring to generate an impedance waveform;
the operational circuitry capturing an electrocardiogram (ECG) signal using a combination of the plurality of electrodes selected for sensing an ECG signal;
the operational circuitry detecting an event in the ECG;
the operational circuitry analyzing a portion of the impedance waveform relative to the detected event; and
the operational circuitry determining whether the detected event is an overdetection using the analysis of the impedance waveform.
1 Assignment
0 Petitions
Accused Products
Abstract
Implantable systems and methods directed toward improved accuracy in cardiac signal analysis. An impedance waveform is captured and used to confirm the analysis performed by the system on electrical signals or electrocardiogram. A detected heart beat from the electrocardiogram is either confirmed or identified as a misdetection depending on whether the impedance waveform shows likely correct or incorrect detection. Identified misdetection can then be corrected or otherwise mitigated.
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Citations
18 Claims
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1. A method of operation in an implantable cardiac stimulus device having operational circuitry for monitoring and analyzing cardiac signals and a plurality of electrodes including at least two electrodes configured for current injection and at least two electrodes configured for electrical monitoring of voltage resultant from the injected current to allow the operational circuitry to generate an impedance waveform for monitoring purposes, the method comprising:
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the operational circuitry injecting current using the at least two electrodes configured for current injection and sensing resultant voltage using the at least two electrodes configured for electrical monitoring to generate an impedance waveform; the operational circuitry capturing an electrocardiogram (ECG) signal using a combination of the plurality of electrodes selected for sensing an ECG signal; the operational circuitry detecting an event in the ECG; the operational circuitry analyzing a portion of the impedance waveform relative to the detected event; and the operational circuitry determining whether the detected event is an overdetection using the analysis of the impedance waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implantable cardiac stimulus device comprising:
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a canister having an external shell composed of material suitable for implantation; a plurality of electrodes exposed external to the external shell of the canister including electrodes configured to inject current and electrodes configured to monitor a resultant voltage from the injected current; operational circuitry, disposed within the canister, operatively coupled to the plurality of electrodes, the operational circuitry including; sensing circuitry configured to sense the resultant voltage and capture an electrocardiogram (ECG) signal; and a controller configured to; generate an impedance waveform from the resultant voltage; detect an event in the ECG; analyze a portion of the impedance waveform relative to the detected event; and determine whether the detected event is an overdetection using the analysis of the impedance waveform; and a power source disposed within the canister and configured to power the operational circuitry. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification