Systems and methods for exploiting near-field impedance and admittance for use with implantable medical devices
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, wherein the individual electrode-based immittance measurements are relative near-field immittance values;
detecting one or more cardiac parameters based on the individual electrode-based immittance values, wherein detecting one or more cardiac parameters includes detecting cardiac parameters representative of disequilibrium among the chambers of the heart from the near-field immittance values; and
controlling at least one device function in response to the parameters.
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Accused Products
Abstract
Various techniques are provided for use with an implantable medical device for exploiting near-field impedance/admittance. Examples include techniques for assessing heart chamber disequilibrium, detecting chamber volumes and pressures, calibrating near-field-based left atrial pressure (LAP) estimation procedures and for assessing the recovery from injury at the electrode-tissue interface. In one particular example, the implantable device assesses the degree of concordance between the left ventricle (LV) and the right ventricle (RV) by quantifying a degree of scatter between LV and RV near-field admittance values. An increase in RV admittance is indicative of RV failure, an increase in LV admittance is indicative of LV failure, and an increase in both LV and RV admittance is indicative of biventricular failure.
33 Citations
28 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, wherein the individual electrode-based immittance measurements are relative near-field immittance values; detecting one or more cardiac parameters based on the individual electrode-based immittance values, wherein detecting one or more cardiac parameters includes detecting cardiac parameters representative of disequilibrium among the chambers of the heart from the near-field immittance values; and controlling at least one device function in response to the parameters. - 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)
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27. A system for use with an implantable medical device for implant within a patient, the system comprising:
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a vector-based detector operative to detect vector-based immittance measurements within tissues of the patient using a plurality of electrodes coupled to the device; a converter operative to convert the vector-based immittance measurements to individual electrode-based immittance values, wherein the individual electrode-based immittance measurements are relative near-field immittance values; a detector operative to detect one or more cardiac parameters based on the individual electrode-based immittance values, wherein the detector detects cardiac parameters representative of disequilibrium among the chambers of the heart from the near-field immittance values; and a controller operative to control at least one device function in response to the detection of disequilibrium.
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28. A system for 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 to individual electrode-based immittance values, wherein the individual electrode-based immittance measurements are relative near-field immittance values; and means for detecting one or more cardiac parameters based on the individual electrode-based immittance values, wherein the means for detecting detects cardiac parameters representative of disequilibrium among the chambers of the heart from the near-field immittance values.
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Specification