Gated physiologial monitoring system and method

• US 10,362,999 B1
• Filed: 10/24/2016
• Issued: 07/30/2019
• Est. Priority Date: 10/24/2015
• Status: Active Grant

• Current Assignee: Maxim Integrated Products, Inc. (Analog Devices, Inc.)
• Original Assignee: Maxim Integrated Products, Inc. (Analog Devices, Inc.)
• Inventors: Straayer, Matthew Z., Seo, Joohyun
• Primary Examiner(s): Messersmith, Eric J
• Application Number:
  US15/332,255
• Time in Patent Office: 1,009 Days
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/053 Measuring electrical impedance or conductance of a portion of the body
• CPC Class Codes: A61B 5/1102 Ballistocardiography
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/7285 for synchronising or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal A61B6/5205, A61B6/541, A61B8/5207, A61B8/543 take precedence

Abstract

Gated physiological monitoring systems and methods are described that utilize a photoplethysmogram (PPG) monitoring device and another (different) physiological monitoring device, where the PPG monitoring device is operated based on timing information obtained from the other physiological monitoring device. In some implementations, control circuitry can be configured to operate the PPG monitoring device based on timing information from a physiological waveform detected by the physiological monitoring device. For example, the control circuitry can operate the PPG monitoring device to capture one or more selected portions of a measured PPG waveform that can then be used to estimate the full PPG waveform or portions of interest.

Claims

1. A gated physiological monitoring system, comprising:

a physiological monitoring device configured to produce a physiological waveform other than a photoplethysmogram (PPG) waveform;

a PPG monitoring device configured to obtain a PPG measurement following an implementation of a measurement timing delay upon detection of a characteristic of the physiological waveform; and

a control circuitry communicatively coupled to the physiological monitoring device and to the PPG monitoring device and configured to;

obtain a sample physiological waveform via the physiological monitoring device,

generate an estimated timing delay between a characteristic of the sample physiological waveform and a known characteristic of the PPG waveform,

obtain at least two consecutive sample PPG waveforms via the PPG monitoring device based on the estimated timing delay, and

generate the measurement timing delay based on the estimated timing delay and the at least two consecutive sample PPG waveforms.

2. The gated physiological monitoring system of claim 1, wherein the physiological monitoring device comprises at least one of an electrocardiogram (ECG) monitoring device, a ballistocardiogram monitoring device, and an impedance cardiogram monitoring device.

3. The gated physiological monitoring system of claim 1, wherein the PPG monitoring device further includes at least one LED driver configured to operate upon the implementation of the measurement timing delay following the detection of the characteristic of the physiological waveform.

4. The gated physiological monitoring system of claim 1, further comprising a data converter in communication with at least one of the physiological monitoring device and the PPG monitoring device.

5. The gated physiological monitoring system of claim 1, wherein the control circuitry comprises:

a memory configured to store one or more modules; and

a processor coupled to the memory, the processor being configured to execute the one or more modules that cause the processor to receive data from the physiological monitoring device and the PPG monitoring device.

6. The gated physiological monitoring system of claim 1, wherein the control circuitry is further configured to determine a PPG measurement frame based on the measurement timing delay and the characteristic of the physiological waveform.

7. The gated physiological monitoring system of claim 6, wherein the control circuitry is further configured to operate the PPG monitoring device during the determined PPG measurement frame to obtain the PPG measurement.

8. The gated physiological monitoring system of claim 1, wherein the control circuitry is further configured to estimate portions of a PPG waveform based on the obtained PPG measurement.

9. The gated physiological monitoring system of claim 1, wherein the control circuitry is further configured to determine at least one physiological parameter based on the PPG measurement.

10. The gated physiological monitoring system of claim 1, wherein the control circuitry is further configured to determine an oxygen saturation physiological parameter based the PPG measurement.

11. A gated physiological monitoring system, comprising:

a physiological monitoring device configured to produce a physiological waveform other than a photoplethysmogram (PPG) waveform;

a PPG monitoring device configured to obtain a PPG measurement during a PPG measurement frame; and

control circuitry in communication with the physiological monitoring device and the PPG monitoring device, the control circuitry including;

a memory configured to store one or more modules; and

a processor coupled to the memory, the processor being configured to execute the one or more modules that cause the processor to;

obtain a sample physiological waveform via the physiological monitoring device,

generate an estimated timing delay between a characteristic of the physiological waveform and a known characteristic of the PPG waveform,

obtain at least two consecutive sample PPG waveforms via the PPG monitoring device based on the estimated timing delay, and

generate a measurement timing delay based on the estimated timing delay and the at least two consecutive sample PPG waveforms,

detect a measured physiological waveform other than the PPG waveform via the physiological monitoring device,

identify a characteristic of the measured physiological waveform corresponding to the characteristic of the sample physiological waveform,

determine the PPG measurement frame based on measured physiological waveform and the measurement timing delay, and

operate the PPG monitoring device during the determined PPG measurement frame to detect one or more portions of a PPG waveform.

12. The gated physiological monitoring system of claim 11, wherein the processor is configured to execute the one or more modules to cause the processor to determine an oxygen saturation physiological parameter based on the detected one or more portions of the PPG waveform.

20. The gated physiological monitoring system of claim 11, wherein the processor is configured to execute the one or more modules to cause the processor to determine at least one physiological parameter based on the detected one or more portions of the PPG waveform.

13. A method for gated physiological monitoring, comprising:

generating a measurement timing delay, the generating of the measurement timing delay comprising;

obtaining a sample physiological waveform other than a photoplethysmogram (PPG) waveform via a physiological monitoring device;

generating an estimated timing delay between a characteristic of the sample physiological waveform and a known characteristic of the PPG waveform;

obtaining at least two consecutive sample PPG waveforms via the PPG monitoring system based on the estimated timing delay; and

generating a measurement timing delay based on the estimated timing delay and the at least two consecutive sample PPG waveforms;

detecting a physiological waveform other than the PPG waveform via the physiological monitoring device

identifying a characteristic of the detected physiological waveform corresponding to the characteristic of the sample physiological waveform;

determining a PPG measurement frame based on the characteristic of the detected physiological waveform and the measurement timing delay; and

detecting one or more portions of a PPG waveform during the PPG measurement frame via the PPG monitoring system.

14. The method of claim 13, wherein the physiological waveform comprises at least one of an ECG waveform, a ballistocardiogram waveform, and an impedance cardiogram waveform.

15. The method of claim 13, wherein the physiological waveform is detected with an ECG monitoring device.

16. The method of claim 13, wherein the one or more portions of the PPG waveform are detected by operating at least one LED driver of a PPG monitoring device during the PPG measurement frame.

17. The method of claim 13, further comprising:

estimating other portions of the PPG waveform based on the detected one or more portions of the PPG waveform.

18. The method of claim 13, further comprising:

determining at least one physiological parameter based on the detected one or more portions of the PPG waveform.

19. The method of claim 13, further comprising:

determining a oxygen saturation physiological parameter based on the detected one or more portions of the PPG waveform.