Method for defining signal templates in implantable cardiac devices
First Claim
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1. A method of cardiac signal analysis comprising:
- sensing a first cardiac event;
configuring template parameters for analysis of the first cardiac event;
defining a first sensed signal for the first cardiac event using the template parameters;
sensing a second cardiac event;
defining a second sensed signal for the second cardiac event using the template parameters;
comparing the second sensed signal to the first sensed signal to determine whether the first sensed signal and template parameters are suitable for defining a cardiac event template; and
if the first sensed signal and template parameters are suitable, retaining the first sensed signal and template parameters for using to define a cardiac event template;
or, if the first sensed signal and template parameters are not suitable, discarding the first sensed signal and template parameters from use in defining a cardiac event template.
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Abstract
Template formation methods for use in implantable cardiac rhythm management devices. In an illustrative method, a signal is captured signal an implanted cardiac rhythm management device, and parameters for analysis of the captured signal are then defined. Then, in the example, additional signals can be captured and used to either verify or discard the captured signal defined parameters. The template formation methods provide for creating a robust template to compare with sensed cardiac complexes. Devices and systems configured to perform template formation and verification methods are also shown.
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Citations
67 Claims
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1. A method of cardiac signal analysis comprising:
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sensing a first cardiac event; configuring template parameters for analysis of the first cardiac event; defining a first sensed signal for the first cardiac event using the template parameters; sensing a second cardiac event; defining a second sensed signal for the second cardiac event using the template parameters; comparing the second sensed signal to the first sensed signal to determine whether the first sensed signal and template parameters are suitable for defining a cardiac event template; and if the first sensed signal and template parameters are suitable, retaining the first sensed signal and template parameters for using to define a cardiac event template;
or, if the first sensed signal and template parameters are not suitable, discarding the first sensed signal and template parameters from use in defining a cardiac event template. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of cardiac signal analysis comprising:
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sampling a signal using electrodes implanted in a patient'"'"'s torso for capturing cardiac signals; defining a first sensing window around a first fiducial point to capture a QRS segment; observing the definition of the first sensing window to create template parameters; defining a second sensing window around a second fiducial point using the template parameters; comparing data in the first sensing window to data in the second sensing window to verify whether to define a valid template using the template parameters; and if the data in the first sensing window is verified, defining a valid template using the template parameter, or, if the data in the first sensing window is not verified using different parameters to define a valid template. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of cardiac signal analysis including forming a template for cardiac event comparisons, the step of forming a template comprising:
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sensing a first cardiac event; identifying a first fiducial point in the first cardiac event using a set of rules; sensing a second cardiac event; identifying a second fiducial point in the second cardiac event using the set of rules; determining whether the first fiducial point and second fiducial point were identified using the same rule; and
, if so, retaining the first cardiac event for forminga template, or,if not, discarding the first cardiac event.
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24. A method of cardiac signal template formation comprising:
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receiving a first cardiac signal from implanted electrodes; selecting a fiducial point in the first cardiac signal; forming a template around the fiducial point;
attempting to verifythe template by receiving additional cardiac signals and using the template to compare the additional cardiac signals to the first cardiac signal wherein the template is verified if the additional cardiac signals and the first cardiac signal, when compared, are found to be similar, and the template is not verified if the additional cardiac signals and the first cardiac signal, when compared, are found to be dissimilar; and
, if the template is verified, retaining the template for use in cardiac signal analysis or, if the template is not verified, rejecting the template for use in cardiac signal analysis. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An implantable cardioverter/defibrillator comprising:
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a lead electrode assembly including a number of electrodes; and a canister housing operational circuitry;
wherein;the lead electrode assembly is coupled to the canister; and the operational circuitry is configured to perform steps of discriminating between cardiac rhythms of a patient'"'"'s heart which are appropriate for therapy, the steps including; sensing a first cardiac event; configuring template parameters for analysis of the first cardiac event; defining a first sensed signal for the first cardiac event using the template parameters; sensing a second cardiac event; defining a second sensed signal for the second cardiac event using the template parameters; comparing the second sensed signal to the first sensed signal to determine whether the first sensed signal and template parameters are suitable for defining a cardiac event template; and if the first sensed signal and template parameters are suitable, retaining the first sensed signal and template parameters for further analysis;
or, if the first sensed signal and template parameters are not suitable, discarding the first sensed signal and template parameters from use in defining a cardiac event template. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. An implantable cardioverter/defibrillator comprising:
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a lead electrode assembly including a number of electrodes; and a canister housing operational circuitry; wherein; the lead electrode assembly is coupled to the canister; and the operational circuitry is configured to perform steps of discriminating between cardiac rhythms of a patient'"'"'s heart which are appropriate for therapy, the steps including; sampling a signal using the lead electrode assembly while implanted in a patient'"'"'s torso in locations chosen for capturing cardiac signals; defining a first sensing window around a first fiducial point to capture a QRS segment; observing the definition of the first sensing window to create template parameters; defining a second sensing window around a second fiducial point using the template parameters; comparing data in the first sensing window to data in the second sensing window to verify whether to define a valid template using the template parameters; and if the data in the first sensing window is verified, defining a valid template using the template parameter, or, if the data in the first sensing window is not verified using different parameters to define a valid template. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56)
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57. An implantable cardioverter/defibrillator comprising:
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a lead electrode assembly including a number of electrodes; and a canister housing operational circuitry; wherein; the lead electrode assembly is coupled to the canister; and the operational circuitry is configured to perform steps of discriminating between cardiac rhythms of a patient'"'"'s heart which are appropriate for therapy, the steps including forming a template using at least the steps of; sensing a first cardiac event; identifying a first fiducial point in the first cardiac event using a set of rules; sensing a second cardiac event; identifying a second fiducial point in the second cardiac event using the set of rules; determining whether the first fiducial point and second fiducial point were identified using the same rule; and
,if so retaing the first cardiac event for forming a template; and
,if not, discarding the first cardiac event.
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58. An implantable cardioverter/defibrillator comprising:
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a lead electrode assembly including a number of electrodes; and a canister housing operational circuitry;
wherein;the lead electrode assembly is coupled to the canister; and the operational circuitry is configured to perform steps of discriminating between cardiac rhythms of a patient'"'"'s heart which are appropriate for therapy, the steps including forming a template using at least the steps of; receiving a first cardiac signal from the lead electrode assembly; selecting a fiducial point in the first cardiac signal; forming a template around the fiducial point;
attempting to verifythe template by receiving additional cardiac signals and using the template to compare the additional cardiac signals to the first cardiac signal wherein the template is verified if the additional cardiac signals and the first cardiac signal, when compared, are found to be similar, and the template is not verified if the additional cardiac signals and the first cardiac signal, when compared, are found to be dissimilar; and
, if the template is verified, retaining the template for use in cardiac signal analysis or, if the template is not verified, rejecting the template for use in cardiac signal analysis. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65, 66, 67)
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Specification