SYSTEMS AND METHODS FOR IMPROVED COMPUTATION OF DIFFERENTIAL PULSE TRANSIT TIME FROM PHOTOPLETHYSMOGRAPH SIGNALS
First Claim
1. A method for processing first and second photoplethysmograph (PPG) signals to determine a differential pulse transit time (DPTT), the method comprising:
- detecting the first and second PPG signals;
performing a DPTT algorithm based at least in part on the first and second PPG signals to obtain a DPTT;
determining a confidence measure associated with the DPTT obtained using the DPTT algorithm;
determining whether to use the DPTT based at least in part on the confidence measure; and
when it is determined not to use the DPTT, performing an alternative DPTT algorithm based at least in part on the first and second PPG signals to obtain the DPTT.
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Accused Products
Abstract
Systems and methods for processing photoplethysmograph (PPG) signals to determine a differential pulse transit time (DPTT) are disclosed. Sensors may be used to obtain first and second PPG signals from a subject. The sensors may be placed at different locations on the subject'"'"'s body. A first algorithm may be performed on the PPG signals or on signals derived from them to obtain a DPTT. A corresponding confidence measure may be determined and if the confidence measure falls within a first numerical range, the calculated DPTT may be used. On the other hand, if the confidence measure falls within a second numerical range, an alternative algorithm may be performed on the PPG signals or on signals derived from them and the DPTT obtained using the alternative algorithm may be used. The DPTT may be used to perform continuous or periodic measurements of blood pressure.
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Citations
20 Claims
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1. A method for processing first and second photoplethysmograph (PPG) signals to determine a differential pulse transit time (DPTT), the method comprising:
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detecting the first and second PPG signals; performing a DPTT algorithm based at least in part on the first and second PPG signals to obtain a DPTT; determining a confidence measure associated with the DPTT obtained using the DPTT algorithm; determining whether to use the DPTT based at least in part on the confidence measure; and when it is determined not to use the DPTT, performing an alternative DPTT algorithm based at least in part on the first and second PPG signals to obtain the DPTT. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for processing first and second photoplethysmograph (PPG) signals to determine a differential pulse transit time (DPTT), the system comprising:
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at least one sensor capable of generating the first and second PPG signals; and a processor capable of receiving the first and second PPG signals; performing a DPTT algorithm based at least in part on the first and second PPG signals to obtain a DPTT; determining a confidence measure associated with the DPTT obtained using the DPTT algorithm; determining whether to use the DPTT based at least in part on the confidence measure; and when it is determined not to use the DPTT, performing an alternative DPTT algorithm based at least in part on the first and second PPG signals to obtain the DPTT. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification