ESTIMATING CARDIOVASCULAR PRESSURE AND VOLUME USING IMPEDANCE MEASUREMENTS
First Claim
1. A method comprising:
- measuring an impedance between at least two electrodes implanted within or proximate to a cardiovascular system of a patient; and
estimating a pressure of an element of the cardiovascular system based on a relationship between impedance and volume and a relationship between the volume and the pressure.
1 Assignment
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Accused Products
Abstract
Techniques for estimating a cardiac chamber or vascular pressure based upon impedance are described. A device or system may measure an impedance between at least two electrodes implanted within or proximate to a cardiovascular system. The device or system may estimate a pressure of an element of the cardiovascular system based on a relationship between impedance and volume of the element, and based on a empirical relationship between the volume and the pressure. The device or system may also estimate the dimension of the element based on the impedance-volume relationship, or other characteristics based on the impedance. Because the impedance measurements may be obtained, in some examples, by using electrodes and leads implanted within the cardiovascular system and coupled to an implantable medical device, a practical estimation of a cardiovascular pressure can be obtained on a chronic basis without requiring the use other invasive sensors, such as micronanometer transducers.
41 Citations
44 Claims
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1. A method comprising:
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measuring an impedance between at least two electrodes implanted within or proximate to a cardiovascular system of a patient; and estimating a pressure of an element of the cardiovascular system based on a relationship between impedance and volume and a relationship between the volume and the pressure. - 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 comprising:
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an impedance measurement module configured to measure an impedance between at least two electrodes implanted within the cardiovascular system; a memory configured to store data representing a relationship between impedance and volume, and a relationship between the volume and pressure; a processor configured to estimate a pressure of an element of the cardiovascular system based on the data. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system comprising:
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means for measuring an impedance between at least two electrodes implanted within a cardiovascular system; and means for estimating a pressure of an element of the cardiovascular system based on a relationship between impedance and volume and based on a relationship between volume and pressure. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A computer-readable medium comprising instructions that cause a processor to:
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measure an impedance between at least two electrodes implanted within a cardiovascular system; and estimate a pressure of an element of the cardiovascular system based on a relationship between the measured impedance and a volume of the element of the cardiovascular system and based on a relationship between the volume and the pressure.
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37. A method comprising:
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measuring a complex impedance between at least two electrodes implanted within or proximate to a cardiovascular system of a patient; determining a reactive component of the measured complex impedance; and providing an indication of change in size of an element of the cardiovascular system based on the reactive component of the measured complex impedance. - View Dependent Claims (38, 39, 40)
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41. An implantable medical device comprising:
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an impedance measurement module configure to measure a complex impedance between at least two electrodes implanted within or proximate to a cardiovascular system of a patient; and a processor configured to determine a reactive component of the measured complex impedance, and provide an indication of change in size of an element of the cardiovascular system based on the reactive component of the measured complex impedance. - View Dependent Claims (42, 43, 44)
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Specification