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US 2025/0049330 A1Published application
Performing one or more pulse transit time measurements based on an electrogram signal and a photoplethysmography signal
AssigneeMedtronic, Inc.
InventorsBruce D. Gunderson, Avram Scheiner
Life of this patent
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Abstract
This disclosure is directed to devices, systems, and techniques for monitoring a patient condition. In some examples, a medical device system includes processing circuitry configured to determine a plurality of pulse transit time (PTT) intervals, determine, based on an accelerometer signal, a posture of a patient from a plurality of postures corresponding to each PTT interval of the plurality of PTT intervals, classify each PTT interval of the plurality of PTT intervals based on the respective posture of the patient corresponding to the respective PTT interval, and monitor, based on the classified plurality of PTT intervals, a patient condition.
Claims20
A medical device system comprising:
- a medical device comprising:
- a plurality of electrodes;
- sensing circuitry configured to sense an electrogram (EGM) signal from target tissue of a patient via the plurality of electrodes over an extended period of time, the extended period of time being greater than one week;
- and
- an accelerometer configured to generate an accelerometer signal over the extended period of time;
- and
- processing circuitry in communication with one or more memories, wherein the processing circuitry is configured to:
- determine, based on the EGM signal and a photoplethysmography (PPG) signal, a plurality of pulse transit time (PTT) intervals occurring over the extended period of time;
- determine, based on the accelerometer signal and for each PTT interval of the plurality of PTT intervals, a posture of a set of postures that the patient occupies during the respective PTT interval;
- classify each PTT interval of the plurality of PTT intervals to indicate the determined posture of the set of postures so that each posture of the set of postures is associated with one or more of PTT intervals of the plurality of PTT intervals;
- and
- monitor a trend of a patient condition over the extended period of time by monitoring the trend in the one or more PTT intervals associated with one or more postures of the set of postures.
9 more elements
A method comprising:
- sensing, by a medical device via a plurality of electrodes, an electrogram (EGM) signal of a patient over an extended period of time, the extended period of time being greater than one week;
- generating, by an accelerometer of the medical device, an accelerometer signal over the extended period of time;
- determining, by the processing circuitry based on the EGM signal and a photoplethysmography (PPG) signal, a plurality of pulse transit time (PTT) intervals occurring over the extended period of time;
- determining, by the processing circuitry based on the accelerometer signal and for each PTT interval of the plurality of PTT intervals, a posture of a set of postures that the patient occupies during the respective PTT interval;
- classifying, by the processing circuitry, each PTT interval of the plurality of PTT intervals to indicate the determined posture of the set of postures so that each posture of the set of postures is associated with one or more of PTT intervals of the plurality of PTT intervals;
- and
- monitoring, by the processing circuitry, a trend of a patient condition over the extended period of time by monitoring a trend in the one or more PTT intervals associated with one or more postures of the set of postures.
4 more elements
A non-transitory computer-readable medium comprising instructions for causing one or more processors to:
- sense, by a medical device via a plurality of electrodes, an electrogram (EGM) signal from target tissue of a patient over an extended period of time, the extended period of time being greater than one week;
- generate an accelerometer signal over the extended period of time;
- determine, based on the EGM signal and a photoplethysmography (PPG) signal, a plurality of pulse transit time (PTT) intervals occurring over the extended period of time;
- determine, based on the accelerometer signal and for each PTT interval of the plurality of PTT intervals, a posture of a plurality of postures that the patient occupies during the respective PTT interval;
- classify each PTT interval of the plurality of PTT intervals to indicate the determined posture of a set of postures so that each posture of the set of postures is associated with one or more of PTT intervals of the plurality of PTT intervals;
- and
- monitor a trend of a patient condition over the extended period of time by monitoring a trend in the one or more PTT intervals associated with one or more postures of the set of postures.
4 more elements
Dependencies are inferred from the claim text.