Methods and systems for alerting practitioners to physiological conditions

• US 10,076,276 B2
• Filed: 08/13/2015
• Issued: 09/18/2018
• Est. Priority Date: 02/19/2008
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Ochs, James, Amundson, Scott, Batchelder, Keith
• Primary Examiner(s): HENSON, DEVIN B
• Application Number:
  US14/825,982
• Publication Number:
  US 20150342541A1
• Time in Patent Office: 1,132 Days
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/4818 Sleep apnoea
• CPC Class Codes: A61B 5/7246 using correlation, e.g. template matching or determination of similarity
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: A61B 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence
• CPC Class Codes: A61B 5/7405 using sound
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: A61B 5/7475 User input or interface means, e.g. keyboard, pointing device, joystick
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/021 operated by electrical means A61M16/202 – A61M16/205 take precedence
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: G08B 21/0453 : worn on the body to detect health condition by physiological monitoring, e.g. electrocardiogram, temperature, breathing detecting, measuring or recording for diagnostic purposes A61B5/00

Abstract

Embodiments of the present disclosure provide systems and methods for monitoring a patient to produce a signal representing a blood oxygen concentration. The signal may be analyzed to determine the presence of one or more sleep apnea events, and an integral of the signal may be calculated if the signal is outside of a set range or threshold. A practitioner may choose to be informed of the presence of sleep apnea events if the blood oxygen concentration is less then a preset limit, if an upper limit has been reached for an integral representing the severity of the oxygen deprivation over time, or anytime sleep apnea events may be present in the signal.

Claims

1. A system, comprising:

an input configured to receive an alarm sensitivity from a user; and

a processor coupled to the input and configured to;

determine a presence of one or more oxygen desaturation patterns in a photoplethsymograph (PPG) signal;

determine a value for an integral in response to a determination that the PPG signal is outside of a PPG range or a PPG threshold;

compare the value of the integral to an integral threshold;

compare the value of the integral to a combined alarm limit in response to a determination that the one or more oxygen desaturation patterns are present and that the value of the integral is less than the integral threshold, wherein the combined alarm limit is based on the integral threshold and the alarm sensitivity;

determine that the combined alarm limit has been violated based at least in part on the comparison;

provide a determination of sleep apnea in response to the determination that the combined alarm limit has been violated; and

increase an air pressure supplied by the system in response to the determination of sleep apnea.

2. The system of claim 1, wherein the processor is configured to determine a presence of a cluster of the one or more oxygen desaturation patterns in the PPG signal.

3. The system of claim 1, wherein the processor is configured to determine the value of the integral by accumulating a product of time and a difference between the PPG signal and a threshold value.

4. The system of claim 1, comprising a display coupled to the processor, wherein the processor is configured to provide the determination of sleep apnea as a visual display on the display.

5. The system of claim 1, comprising a PPG sensor configured to generate the PPG signal.

6. The system of claim 1, comprising a mask operatively coupled to the processor, wherein the processor is configured to increase the air pressure supplied by the system via the mask in response to the determination of sleep apnea.

7. The system of claim 1, wherein the alarm sensitivity comprises a percentage.

8. The system of claim 1, comprising a network interface operatively coupled to the processor and configured to send the determination of sleep apnea to a device located on a local area network.

9. A system, comprising:

a photoplethsymograph (PPG) sensor configured to generate a PPG signal; and

a patient monitor comprising;

an input configured to receive an alarm sensitivity from a user; and

a processor coupled to the input and configured to;

receive the PPG signal from the PPG sensor;

determine a presence of one or more oxygen desaturation patterns in the PPG signal;

determine a value for an integral in response to a determination that the PPG signal is outside of a PPG range or a PPG threshold;

compare the value of the integral to an integral threshold;

compare the value of the integral to a combined alarm limit in response to a determination that the one or more oxygen desaturation patterns are present and that the value of the integral is less than the integral threshold, wherein the combined alarm limit is based on the integral threshold and the alarm sensitivity;

determine that the combined alarm limit has been violated based at least in part on the comparison;

provide a determination of sleep apnea in response to the determination that the combined alarm limit has been violated; and

increase an air pressure supplied by the system in response to the determination of sleep apnea.

10. The system of claim 9, wherein the patient monitor comprises a display, and wherein the processor is configured to cause the display to provide the determination of sleep apnea.

11. The system of claim 9, comprising a treatment device operatively coupled to the patient monitor, wherein the processor is configured to increase the air pressure supplied by the system via the treatment device in response to the determination of sleep apnea.

12. The system of claim 9, wherein the processor is configured to determine a presence of a cluster of the one or more oxygen desaturation patterns in the PPG signal.

13. The system of claim 9, wherein processor is configured to determine the value of the integral by accumulating a product of time and a difference between the PPG signal and a threshold value.

14. The system of claim 9, wherein the processor is configured to provide the determination of sleep apnea as a message to a device located on a local area network.

15. A method, comprising:

receiving, via an input, an alarm sensitivity from a user;

determining, via a processor, a presence of one or more oxygen desaturation patterns in a photoplethsymograph (PPG) signal;

determining, via the processor, a value for an integral in response to a determination that the PPG signal is outside of a PPG range or a PPG threshold;

comparing, via the processor, the value of the integral to an integral threshold;

comparing, via the processor, the value of the integral to a combined alarm limit in response to a determination that the one or more oxygen desaturation patterns are present and that the value of the integral is less than the integral threshold, wherein the combined alarm limit is based on the integral threshold and the alarm sensitivity;

determining, via the processor, that the combined alarm limit has been violated based at least in part on the comparison;

providing, via the processor, a determination of sleep apnea in response to the determination that the combined alarm limit has been violated; and

increasing, via the processor, an air pressure supplied by a system in response to the determination of sleep apnea.

16. The method of claim 15, comprising:

generating, via a PPG sensor, the PPG signal; and

receiving, via the processor, the PPG signal from the PPG sensor.

17. The method of claim 15, wherein providing the determination of sleep apnea comprises providing the determination of sleep apnea as a visual display on a display operatively coupled to the processor.

18. The method of claim 15, wherein providing the determination of sleep apnea comprises providing the determination of sleep apnea as a message to a device on a local area network.

19. The method of claim 15, comprising activating, via the processor, a treatment device to increase the air pressure supplied by the system via the treatment device in response to the determination of sleep apnea.

20. The method of claim 15, comprising determining, via the processor, a presence of a cluster of the one or more oxygen desaturation patterns in the PPG signal.