Heart stimulating device
First Claim
1. An implantable heart stimulating device comprising:
- an activity sensor configured to interact in vivo with a living subject to detect physical activity of the subject and to generate and emit an activity signal indicative of said activity;
a blood temperature sensor configured to interact in vivo with the subject to measure blood temperature inside the heart of the subject and to generate and emit a temperature signal indicative of the measured blood temperature; and
a processor connected to said activity sensor and to said blood temperature sensor that receives said activity signal and said temperature signal therefrom, respectively, and said processor, from said activity signal, being configured to detect at least two onsets of activity by the subject and, for each of said at least two onsets of activity, to correlate a magnitude of a characteristic dip in the measured blood temperature represented in said temperature signal with a corresponding activity level, to thereby obtain at least two respective correlation points and, from said at least two correlation points, to generate an indicator value representing a degree of congestive heart failure of the subject, and to make said indicator value available as an output of the processor.
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Accused Products
Abstract
An implantable heart stimulating device for indicating congestive heart failure (CHF) has a processor, an activity sensor that generates an activity signal indicative of a patient'"'"'s activity, and a blood temperature sensor that measures blood temperature inside the heart of the patient and generates a temperature signal indicative of the measured temperature. From the activity signal and the temperature signal, the processor identifies a characteristic dip in the temperature signal related to a predetermined increase in the activity signal. The processor determines a CHF indicator value indicating the degree of CHF based on the magnitude of the temperature sensor dip for at least two increased activity levels.
11 Citations
8 Claims
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1. An implantable heart stimulating device comprising:
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an activity sensor configured to interact in vivo with a living subject to detect physical activity of the subject and to generate and emit an activity signal indicative of said activity; a blood temperature sensor configured to interact in vivo with the subject to measure blood temperature inside the heart of the subject and to generate and emit a temperature signal indicative of the measured blood temperature; and a processor connected to said activity sensor and to said blood temperature sensor that receives said activity signal and said temperature signal therefrom, respectively, and said processor, from said activity signal, being configured to detect at least two onsets of activity by the subject and, for each of said at least two onsets of activity, to correlate a magnitude of a characteristic dip in the measured blood temperature represented in said temperature signal with a corresponding activity level, to thereby obtain at least two respective correlation points and, from said at least two correlation points, to generate an indicator value representing a degree of congestive heart failure of the subject, and to make said indicator value available as an output of the processor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An implantable heart stimulating device comprising:
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an activity sensor configured to interact in vivo with a living subject to detect physical activity of the subject and to generate and emit an activity signal indicative of said activity; a blood temperature sensor configured to interact in vivo with the subject to measure blood temperature inside the heart of the subject and to generate and emit a temperature signal indicative of the measured blood temperature; and a processor that receives said activity signal and said temperature signal from said activity sensor and said blood temperature sensor, respectively, and said processor being configured to detect an onset of activity by said subject from said activity signal and, thereafter, to identify a characteristic dip of the measured blood temperature following said onset of activity and to determine a magnitude of said characteristic dip, and to identify a value of said activity signal occurring contemporaneously with said characteristic dip, and to determine an indicator value representing a degree of congestive heart failure of the subject as a quotient of said magnitude of said characteristic dip and said contemporaneously occurring value of the activity signal, and to make said indicator value available at an output of the processor as an electronic output signal. - View Dependent Claims (8)
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Specification