SYSTEMS AND METHODS FOR DETERMINING DIFFERENTIAL PULSE TRANSIT TIME FROM THE PHASE DIFFERENCE OF TWO ANALOG PLETHYSMOGRAPHS
First Claim
1. A method for determining physiological information about a subject, the method comprising:
- receiving two or more analog physiological signals of a subject;
processing the analog physiological signals with a phase detector to generate phase information;
determining using processing equipment information indicative of differential pulse transit time based at least in part on the phase information; and
determining using processing equipment physiological information about the subject based at least in part on the information indicative of differential pulse transit time.
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Accused Products
Abstract
Systems and methods are provided for patient monitors which apply phase detection operations to analog signals to identify differential pulse transit time (DPTT). Photoplethysmograph (PPG) signals measured at two sensor sites may be processed by a phase detection system to identify phase information that allows the calculation of a DPTT. The phase detection system may process analog PPG signals in the analog domain to determine phase information. In some embodiments, the phase detection system may process optical oximetry sensor signals to determine phase information using, for example, interferometric methods.
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Citations
20 Claims
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1. A method for determining physiological information about a subject, the method comprising:
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receiving two or more analog physiological signals of a subject; processing the analog physiological signals with a phase detector to generate phase information; determining using processing equipment information indicative of differential pulse transit time based at least in part on the phase information; and determining using processing equipment physiological information about the subject based at least in part on the information indicative of differential pulse transit time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for determining physiological information about a subject, the system comprising:
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at least one signal input configured to receive two or more analog physiological signals of a subject; a phase detector coupled to the at least one signal input, the phase detector configured to process the analog physiological signals to generate phase information; and electronic processing equipment coupled to the at least one signal input and the phase detector, the electronic processing equipment configured to; determine information indicative of differential pulse transit time based at least in part on the phase information; and determine physiological information about the subject based at least in part on the information indicative of differential pulse transit time. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. Computer-readable medium for use in determining physiological information about a subject, the computer-readable medium having computer program instructions recorded thereon for:
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receiving two or more analog physiological signals of a subject; processing the analog physiological signals with a phase detector to generate phase information; determining information indicative of differential pulse transit time based at least in part on the phase information; and determining physiological information about the subject based at least in part on the information indicative of differential pulse transit time. - View Dependent Claims (20)
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Specification