Pulse oximetry-based cardio-pulmonary resuscitation (CPR) quality feedback systems and methods

Patent metadata

Field	Value
Publication number	US-9949892-B2
Application number	US-201414497209-A
Country	US
Kind code	B2
Filing date	Sep 25, 2014
Priority date	Oct 11, 2013
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

Medical devices, plug-ins, systems, and methods for CPR quality feedback are disclosed. The medical devices can calculate peripheral circulation relevant parameters based on measured signals containing at least partial hemodynamic characteristics. Amplitude and area characteristics included in the peripheral circulation relevant parameters can further be determined for providing feedback and control relating to CPR quality during the compression process. Also, compression interruption during CPR can be evaluated based on a pulse waveform generated from the measured signals.

First claim

The invention claimed is:

1. A cardio-pulmonary resuscitation (CPR) monitoring device, comprising:
an optical transceiver comprising:
a light emitting tube that emits at least one light signal; and
a receiving tube that receives the at least one light signal after the at least one light signal has passed through human tissue and converts the at least one light signal into at least one electrical signal;

a digital processor to convert the at least one electrical signal into at least one digital signal including a real-time pulsatile perfusion characteristic and process the at least one digital signal to obtain at least one peripheral circulation parameter related to CPR quality; wherein the digital processor obtains the real-time pulsatile perfusion characteristic by separating fluctuant components and constant components of the at least one digital signal; and, wherein the CPR quality is related to the fluctuant and constant components of the at least one peripheral circulation parameter and conformity of the at least one peripheral circulation parameter with a target range; and
an output module to output information corresponding to the at least one peripheral circulation parameter.

2. The CPR monitoring device of claim 1 , wherein the at least one peripheral circulation parameter includes at least one of: a first reflecting parameter that reflects a frequency variation characteristic of CPR compression, a second reflecting parameter that reflects a depth variation characteristic of CPR compression, and a third reflecting parameter that reflects comprehensive variation characteristics of frequency and depth of CPR compression.

3. The CPR monitoring device of claim 2 , wherein
the digital processor obtains the first reflecting parameter by identifying the fluctuant component of the at least one digital signal and calculating a frequency of the fluctuant component;
the digital processor obtains the second reflecting parameter by identifying the fluctuant component of the at least one digital signal and making an amplitude conversion on the fluctuant component.

4. The CPR monitoring device of claim 2 , wherein
the digital processor obtains a corrected second reflecting parameter by identifying the fluctuant component and the constant component of the at least one digital signal and calculating an amplitude ratio of the fluctuant component and the constant component after respectively making amplitude conversion on these two components.

5. The CPR monitoring device of claim 2 , wherein
the digital processor obtains the third reflecting parameter by identifying the fluctuant component of the at least one digital signal and calculating an area integral of the fluctuant component.

6. The CPR monitoring device of claim 2 , wherein
the digital processor obtains a corrected third reflecting parameter by identifying the fluctuant component and the constant component of the at least one digital signal and calculating an area ratio between an area integral of the fluctuant component and an area integral of the constant component.

7. The CPR monitoring device of claim 1 , wherein the digital processor processes the at least one digital signal using at least one of a time domain analysis method and a frequency domain analysis method.

8. The CPR monitoring device of claim 7 , wherein the time domain analysis method calculates the at least one peripheral circulation parameter by identifying at least one of a frequency characteristic, an amplitude characteristic and an area characteristic of the at least one digital signal; and
wherein the frequency domain analysis method is used for frequency spectrum identification based on non-zero frequency spectrum or used for frequency spectrum identification based on a ratio between non-zero frequency spectrum and zero-frequency spectrum.

9. The CPR monitoring device of claim 8 , wherein the time domain analysis method identifies the amplitude characteristic and the area characteristic of the at least one digital signal based on the fluctuant component of the at least one digital signal or based on a ratio between the fluctuant component and a constant component of the at least one digital signal.

10. The CPR monitoring device of claim 1 , wherein the CPR monitoring device is configured as a medical device plug-in, the medical device plug-in comprising:
an enclosure component;
a physiological signal acquisition interface, which is positioned on an external surface of the enclosure component and is used to be connected with signal acquisition accessories;
a physiological signal processing module positioned in the enclosure component, wherein the physiological signal processing module is used to obtain acquisition signals through the physiological signal acquisition interface, convert the acquisition signals into digital signals and obtain the at least one peripheral circulation parameter through calculation based on the digital signals;
an interactive interface, wherein the physiological signal processing module makes information interaction with a host through the interaction interface.

11. A cardio-pulmonary resuscitation (CPR) monitoring device, comprising:
a blood oxygen probe to probe measured positions of a test subject and to detect blood oxygen signals of the test subject in real time;
a blood oxygen module coupled to the blood oxygen probe, wherein the blood oxygen module acquires the blood oxygen signals outputted from the blood oxygen probe, generates a pulse oximetry waveform based on the blood oxygen signals, separates a constant component and a fluctuant component of the pulse oximetry waveform, calculates one or more peripheral circulation parameters related to CPR quality based on the pulse oximetry waveform, and outputs associated information on the at least one peripheral circulation parameters related to CPR quality; and
an output module coupled to the blood oxygen module, wherein the output module provides feedback on the associated information outputted by the blood oxygen module on the one or more peripheral circulation parameters related to CPR quality;
wherein the at least one peripheral circulation parameters include a blood oxygen frequency characteristic of the pulse oximetry waveform and one or more peripheral circulation parameters generated by compression; and
wherein the one or more peripheral circulation parameters generated by compression include amplitude characteristic of a single pulse wave and/or an area characteristic of a single pulse wave.

12. The CPR monitoring device of claim 1 , wherein the blood oxygen module calculates the blood oxygen frequency characteristic and the one or more peripheral circulation parameters generated by compression based on one of the fluctuant component of the pulse oximetry waveform and a ratio between the fluctuant component and the constant component of the pulse oximetry waveform.

13. The CPR monitoring device of claim 11 , wherein the output module is a display module to display at least one of a waveform graph of the amplitude characteristic and the area characteristic on a display interface; wherein the display module further displays at least one of an amplitude distribution range limit and an area distribution range limit related to a standard value of chest compression quality on the waveform graph of at least one of the amplitude characteristic and the area characteristic.

14. The CPR monitoring device of claim 11 , wherein the blood oxygen module also calculates a fluctuating value of the amplitude characteristic, evaluates whether the fluctuating value of the amplitude characteristic is less than a first preset value

Assignees

• Peking Union Medical College Hospital Cams
• Shenzhen Mindray Biomedical Electronics Co Ltd
• Peking Union Medical College Hospital

Inventors

• Xu Jun
• Yu Xuezhong
• Han Fei
• Zheng Liangliang
• Zhu Huadong
• Wang Cheng
• Zhang Xiaocui
• Li Chen
• Yang Jingming
• Jin Xingliang

Classifications

• A61H2201/5043

  Displays · CPC title

• A61H2230/065

  used as a control parameter for the apparatus · CPC title

• A61B5/0205

  Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition · CPC title

• A61B5/14551

  for measuring blood gases · CPC title

• A61N1/3925

  Monitoring; Protecting · CPC title