NEAR FIELD-BASED SYSTEMS AND METHODS FOR ASSESSING IMPEDANCE AND ADMITTANCE FOR USE WITH AN IMPLANTABLE MEDICAL DEVICE
First Claim
1. A method for use with an implantable medical device for implant within a patient, the method comprising:
- detecting vector-based immittance measurements within tissues of the patient using a plurality of electrodes coupled to the device;
converting the vector-based immittance measurements to individual electrode-based immittance values; and
controlling at least one device function in response to the individual electrode-based immittance values.
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Abstract
A new model is provided for understanding and exploiting impedance or admittance values measured by implantable medical devices, such as pacemakers or cardiac resynchronization devices (CRTs.) The device measures impedance along vectors extending through tissues of the patient between various pairs of electrodes. The device then converts the vector-based impedance measurements into near-field individual electrode-based impedance values. This is accomplished, in at least some examples, by converting the vector-based impedance measurements into a set of linear equations to be solved while ignoring far-field contributions to the impedance measurements. The device solves the linear equations to determine the near-field impedance values for the individual electrodes, which are representative of the impedance of tissues in the vicinity of the electrodes. The device then performs or controls various device functions based on the near-field values, such as analyzing selected near-field values to detect heart failure or pulmonary edema.
12 Citations
32 Claims
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1. A method for use with an implantable medical device for implant within a patient, the method comprising:
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detecting vector-based immittance measurements within tissues of the patient using a plurality of electrodes coupled to the device; converting the vector-based immittance measurements to individual electrode-based immittance values; and controlling at least one device function in response to the individual electrode-based immittance values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system use with an implantable medical device for implant within a patient, the system comprising:
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a vector-based immittance detector operative to detect vector-based immittance measurements within tissues of the patient using a plurality of electrodes coupled to the device; a immittance converter operative to convert the vector-based immittance measurements into individual electrode-based immittance values; and a controller operative to control at least one device function in response to the individual electrode-based immittance values.
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32. A system use with an implantable medical device for implant within a patient, the system comprising:
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means for detecting vector-based immittance measurements within tissues of the patient using a plurality of electrodes coupled to the device; means for converting the vector-based immittance measurements into individual electrode-based immittance values; and means for controlling at least one device function in response to the individual electrode-based immittance values.
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Specification