Method and system for remote hemodynamic monitoring
First Claim
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1. A cardiac sensor system implantable in a heart, said system comprising:
- means for measuring a cardiac characteristic at least one point in the cardiac cycle;
means for measuring a myocardial characteristic at least one point in the cardiac cycle; and
means for transmission of the data from an implanted location in the heart to an external location.
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Abstract
A cardiac sensor system includes implanted cardiac sensor assemblies and an external controller which receives information from the implanted sensors. The sensors permit direct measurement of a number of physiologic parameters. The external controller permits calculation of a variety of performance values based on the measured physiological parameters. Optionally, patient oxygen consumption can be measured externally and combined with the internally measured physiologic parameters in order to calculate a variety of unique performance values.
140 Citations
49 Claims
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1. A cardiac sensor system implantable in a heart, said system comprising:
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means for measuring a cardiac characteristic at least one point in the cardiac cycle;
means for measuring a myocardial characteristic at least one point in the cardiac cycle; and
means for transmission of the data from an implanted location in the heart to an external location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cardiac sensor assembly implantable across a cardiac wall, said assembly comprising:
means for spanning the cardiac wall to provide surfaces on each side of the wall; and
at least one sensor on each surface. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- 21. A cardiac sensor system implantable across a cardiac wall, said system comprising means for measuring displacement of opposite surfaces of the cardiac wall over time.
- 25. A cardiac sensor system implantable across a cardiac wall, said system comprising means for measuring expansibility across the wall over time.
- 28. A cardiac sensor system implantable on a cardiac wall, said system comprising means for measuring muscular contractility over a surface of the wall over time.
- 32. A cardiac sensor system implantable on or across a cardiac wall, said system comprising means for measuring myocardial compliance.
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34. A system for assessing cardiac status of a patient, said system comprising:
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a first interface adapted to receive data from cardiac sensors implanted in a patient and produce a plurality of outputs corresponding to said data;
a second interface adapted to receive external data selected from the group consisting of ambient pressure, patient oxygen consumption data, and patient carbon dioxide production data from a breath analyzer; and
a processor adapted to receive data from both interfaces and to calculate one or more cardiac performance values from the received data. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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43. A method for measuring a cardiac performance value, said method comprising:
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measuring a cardiac characteristic at least one point in the cardiac cycle;
measuring a myocardial characteristic at least one point in the cardiac cycle; and
determining the cardiac performance value based on a ratio of the measured cardiac characteristic and the measured myocardial characteristic. - View Dependent Claims (44, 45, 46, 47, 48)
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49-99. -99. (canceled)
Specification