Implantable device and method for monitoring venous diameter
First Claim
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1. An implantable medical device system, comprising:
- an implantable sensor comprising at least a pair of measurement electrodes, the implantable sensor configured to be operatively positioned within a vein and further configured to generate a sensor signal responsive to changes in a diameter of the vein, wherein the sensor signal comprises a signal measurable between the pair of measurement electrodes;
timing and control circuitry configured to deliver a driver signal to the sensor to enable the sensor to generate the sensor signal; and
a processor configured to receive the sensor signal, and configured to determine a diameter of the vein in response to the sensor signal and to estimate 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).
35 Citations
15 Claims
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1. An implantable medical device system, comprising:
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an implantable sensor comprising at least a pair of measurement electrodes, the implantable sensor configured to be operatively positioned within a vein and further configured to generate a sensor signal responsive to changes in a diameter of the vein, wherein the sensor signal comprises a signal measurable between the pair of measurement electrodes; timing and control circuitry configured to deliver a driver signal to the sensor to enable the sensor to generate the sensor signal; and a processor configured to receive the sensor signal, and configured to determine a diameter of the vein in response to the sensor signal and to estimate a central venous pressure (CVP) based upon the vein diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. 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 and low stiffness relative to a vein in which the transvenous lead is positioned such that the preformed portion when in contact with a vein wall of the vein will change shape with a change in vein diameter without causing distension of the vein, wherein the preformed portion comprises a preformed shape such that after any shape changing forces acting on the preformed portion are removed the preformed portion will move toward regaining its preformed shape, 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 configured to deliver a driver signal between 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, to compute a diameter of the vein in response to the measured response signal, to estimate CVP in response to the computed vein diameter, and to detect a heart failure condition in response to the estimated CVP, wherein a shape in change of the preformed portion changes a distance between at least one of the driver electrode pair and measurement electrode pair, and wherein the processor being further configured to determine a change in the computed vein diameter due to a respiration cycle and to determine a trend in the change in vein diameter due to respiration.
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Specification