Implantable Device and Method for Monitoring Venous Diameter
First Claim
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1. A method for use in an implantable medical device, comprising:
- receiving a signal from an implantable sensor operatively positioned relative to a vein, the signal being responsive to changes in a diameter of the vein;
determining a diameter of the vein in response to the sensor signal; and
estimating a central venous pressure (CVP) based upon the vein diameter.
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Abstract
An implantable medical device system and associated method receive a signal from an implantable sensor operatively positioned relative to a vein, the signal being responsive to changes in a diameter of the vein. A diameter of the vein is determined in response to the sensor signal and used in estimating central venous pressure (CVP).
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Citations
27 Claims
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1. A method for use in an implantable medical device, comprising:
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receiving a signal from an implantable sensor operatively positioned relative to a vein, the signal being responsive to changes in a diameter of the vein; determining a diameter of the vein in response to the sensor signal; and estimating a central venous pressure (CVP) based upon the vein diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable medical device system, comprising:
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an implantable sensor adapted to be operatively positioned relative to a vein, the implantable sensor generating a sensor signal responsive to changes in a diameter of the vein; timing and control circuitry for delivering a driver signal to the sensor to enable the sensor to generate the sensor signal; and a processor for receiving the sensor signal and configured to determine a diameter of the vein in response to the sensor signal and estimate a central venous pressure (CVP) based upon the vein diameter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An implantable medical device system for monitoring central venous pressure (CVP), comprising:
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a transvenous lead comprising a preformed portion having a high compliance relative to a vein in which the transvenous lead is positioned, the preformed portion changing shape in response to a physiological change in the diameter of the vein wall; a first electrode, a second electrode and a third electrode carried by the transvenous lead and positioned along the preformed portion in a triangular relationship; timing and control circuitry for delivering a driver signal between in a driver electrode pair comprising the first electrode and the second electrode; a processor configured to measure a response signal between a measurement electrode pair comprising the second electrode and the third electrode and compute a diameter of the vein in response to the measured response signal, estimate CVP in response to the computed vein diameter, and detect a heart failure condition in response to the estimated CVP, the processor further configured to determine a change in the computed vein diameter due to a respiration cycle; wherein estimating the CVP comprises determining a trend in vein diameter measurements; wherein the trend in vein diameter measurements comprises a trend in the change in vein diameter due to respiration; wherein a shape change of the preformed portion changes a distance between at least one of the driver electrode pair and measuring electrode pair.
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Specification