Systems and Methods for Heart and Activity Monitoring
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Accused Products
Abstract
Methods and systems for monitoring a heart failure or transplant rejection status of a patient including use of a device or system to collect intramyocardial electrogram (IMEG) signals from the patient at different times automatically when a detected activity level of the patient is below a preset threshold level for a predetermined amount of time, and use of a device or system to generate a status indicator value proportional to a combination of parameters extracted from at least a portion of the collected IMEG signals. Methods and systems can also include measuring time delay values between IMEG signals collected from different locations in the patient. The IMEG signals can be collected from the right ventricular septum and the right ventricular apex of the patient or from the right and left ventricular myocardium of the patient.
74 Citations
72 Claims
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1-20. -20. (canceled)
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21. A method of monitoring the heart failure status of a patient comprising:
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a) detecting an activity level of the patient; b) automatically collecting a series of intramyocardial electrogram (IMEG) signals from the patient if the detected activity level of the patient is below a preset threshold level for a predetermined amount of time, wherein the collected series of IMEG signals includes IMEG signals collected from the right ventricular septum of the patient; c) transmitting the collected series of IMEG signals to a system external to the patient; d) extracting a first parameter and a second parameter from at least a portion of the collected series of IMEG signals using the external system; e) generating a status indicator value that is directly proportional to the product of the first parameter and the second parameter; f) repeating steps a) through e) at different times to generate a plurality of status indicator values from the patient; and g) analyzing the plurality of status indicator values to determine a change in the heart failure status of the patient. - View Dependent Claims (22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40)
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23. (canceled)
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39. (canceled)
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41-60. -60. (canceled)
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61. A method of monitoring the heart failure status of a patient comprising:
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detecting an activity level of the patient; using a device implanted in the patient to automatically collect a series of intramyocardial electrogram (IMEG) signals from the right ventricular septum and the right ventricular apex of the patient if the detected activity level of the patient is below a preset threshold level for a predetermined amount of time; and using a device external to the patient to measure time differences between the IMEG signals collected from the right ventricular septum of the patient and the IMEG signals collected from the right ventricular apex.
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62-70. -70. (canceled)
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71. A method of monitoring the heart failure status of a patient comprising:
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a) detecting an activity level of the patient; b) automatically collecting a series of intramyocardial electrogram (IMEG) signals from a right ventricular septum and a right ventricular apex of the patient if the detected activity level of the patient is below a preset threshold value for a predetermined amount of time; c) transmitting the collected series of IMEG signals to a system external to the patient; d) measuring a time delay value between IMEG signals from the right ventricular septum and IMEG signals from the right ventricular apex using the external system; e) repeating steps a) through d) at different times to measure a plurality of time delay values from the patient; and f) analyzing the plurality of time delay values to determine a change in the heart failure status of the patient.
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72-113. -113. (canceled)
Specification