DEVICE AND METHOD OF A MEDICAL IMPLANT FOR MONITORING PROGRESSION OF HEART FAILURE IN A HUMAN HEART
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Abstract
In a device and method for a medical implant for monitoring progression of heart failure in a human heart, an activity sensor provides information related to the activity level of a patient and an oxygen sensor provides information related to the level of oxygen content in venous blood. A determined level of venous oxygen content at a determined activity level is obtained, and that level of venous oxygen content is compared to stored values at a corresponding activity level. The result of the comparison is used as a basis for determining a degree of heart failure.
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Citations
48 Claims
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1-25. -25. (canceled)
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26. A device configured for use in a medical implant to monitor progression of heart failure in a human heart of a subject, said device comprising:
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a processor; said processor having a first input interface configured to receive an oxygen signal from an oxygen sensor representing a level of venous oxygen in flood of the subject; said processor having a second input interface configured to receive an activity signal from an activity sensor representing a level of physical activity of the subject; said processor being configured to determine a level of physical activity from the received activity signal and to compare at least one parameter of the received oxygen signal to at least one stored oxygen signal parameter for the determined level of physical activity, to obtain a comparison result, and to automatically determine a degree of heart failure of the heart of the subject from said comparison result; and said processor comprising an output interface at which an output signal is emitted indicating said degree of heart failure. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An implantable cardiac stimulator for delivering stimulation pulses to a human heart comprising:
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a pulse generator that emits stimulation pulses; a cardiac lead arrangement connected to said pulse generator and configured to deliver said stimulation pulses to the heart of the subject; and a control circuit comprising a processor; said processor having a first input interface configured to receive an oxygen signal from an oxygen sensor representing a level of venous oxygen in flood of the subject, said processor having a second input interface configured to receive an activity signal from an activity sensor representing a level of physical activity of the subject, said processor being configured to determine a level of physical activity from the received activity signal and to compare at least one parameter of the received oxygen signal to at least one stored oxygen signal parameter for the determined level of physical activity, to obtain a comparison result, and to automatically determine a degree of heart failure of the heart of the subject from said comparison result, and said processor comprising an output interface at which an output signal is emitted indicating said degree of heart failure; and said control circuit being further configured to supply said output signal to said pulse generator to control generation of said stimulation pulses. - View Dependent Claims (44, 45)
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46. A method of a medical implant for monitoring progression of heart failure in a human heart, comprising the steps of:
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providing an oxygen signal sensitive to a level of venous oxygen content; receiving an activity signal sensitive to a level of physical activity of a patient; determining a level of physical activity from the received activity signal; comparing at least one parameter of the received oxygen signal to at least one corresponding stored oxygen signal parameter for the determined level of physical activity; and determining the degree of heart failure on the basis of said comparison. - View Dependent Claims (47)
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48. A computer-readable medium loadable into a processor of a medical implant, said computer-readable medium being encoded with programming instructions, and said programming instructions causing said processor to:
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provide an oxygen signal sensitive to a level of venous oxygen content; receive an activity signal sensitive to a level of physical activity of a patient; determine a level of physical activity from the received activity signal; compare at least one parameter of the received oxygen signal to at least one corresponding stored oxygen signal parameter for the determined level of physical activity; and determine the degree of heart failure on the basis of said comparison.
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Specification