Defibrillator display

• US 9,788,734 B2
• Filed: 05/23/2016
• Issued: 10/17/2017
• Est. Priority Date: 02/12/2010
• Status: Active Grant

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Inventors: Tan, Qing, Freeman, Gary A., Geheb, Frederick J., Bures, Martin E., Silver, Annemarie
• Primary Examiner(s): EVANISKO, GEORGE ROBERT
• Application Number:
  US15/161,515
• Publication Number:
  US 20160262632A1
• Time in Patent Office: 512 Days
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• 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 5/082 Evaluation by breath analysis, e.g. determination of the chemical composition of exhaled breath A61B5/083, A61B5/091 take precedence
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/28 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/339 Displays specially adapted therefor
• 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 5/742 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: A61H 2201/5076 Frequency sensors
• CPC Class Codes: A61H 2201/5084 Acceleration sensors
• CPC Class Codes: A61H 2230/04 Heartbeat characteristics, e.g. E.G.C., blood pressure modulation
• CPC Class Codes: A61H 2230/205 partial CO2-value
• CPC Class Codes: A61H 2230/207 partial O2-value
• CPC Class Codes: A61H 2230/30 Blood pressure A61H2230/04 takes precedence
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: A61N 1/046 : Specially adapted for shock therapy, e.g. defibrillation
• CPC Class Codes: A61N 1/0492 : Patch electrodes A61N1/0412, A61N1/0428 take precedence
• CPC Class Codes: A61N 1/3925 : Monitoring; Protecting
• CPC Class Codes: A61N 1/3931 : Protecting, e.g. back-up systems
• CPC Class Codes: A61N 1/3937 : Monitoring output parameters
• CPC Class Codes: A61N 1/3975 : Power supply A61N1/378 takes precedence
• CPC Class Codes: A61N 1/3981 : High voltage charging circuitry
• CPC Class Codes: A61N 1/3987 : characterised by the timing or triggering of the shock
• CPC Class Codes: A61N 1/3993 : User interfaces for automatic external defibrillators
• CPC Class Codes: G09B 19/003 : Repetitive work cycles; Sequence of movements
• CPC Class Codes: G09B 23/288 : for artificial respiration or heart massage
• CPC Class Codes: G16H 20/30 : relating to physical therapies or activities, e.g. physiotherapy, acupressure or exercising
• CPC Class Codes: G16H 20/40 : relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
• CPC Class Codes: G16H 40/63 : for local operation
• CPC Class Codes: G16H 50/00 : ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
• CPC Class Codes: G16Z 99/00 : Subject matter not provided for in other main groups of this subclass

Abstract

An external defibrillator system is provided. The system includes: a graphical display; one or more sensors for obtaining data regarding chest compressions performed on a patient; and a controller configured to display on the graphical display numeric values for depth and/or rate of the chest compressions based upon the data from the one or more sensors. A method for using an external defibrillator including the steps of: obtaining data regarding chest compressions performed on a patient; and displaying on a graphical display screen of the defibrillator numeric values for depth and/or rate of the chest compressions based upon the data is also provided.

Claims

1. An external defibrillator system comprising:

a display;

an accelerometer comprised in a housing configured to be placed on a patient'"'"'s sternum for obtaining data comprising at least one of acceleration, velocity or displacement of the sternum as a result of chest compressions performed on the patient;

a processor configured to determine sternal displacement and compression rate from the data and to compare the sternal displacement to a predetermined maximum acceptable sternal displacement value and a predetermined minimum acceptable sternal displacement value for sternal displacement; and

a controller configured to;

display on the display one or more numeric values of a unit length of the determined sternal displacement during chest compressions, the displayed values having at least two significant figures and a resolution of less than an inch, provide a visual indication of when the determined sternal displacement is above the predetermined maximum acceptable sternal displacement value and when the determined sternal displacement is below the predetermined minimum acceptable sternal displacement value, the visual indication comprising highlighting of the numerical value of the unit length of the determined sternal displacement, and

display on the display one or more numeric values for compression rate.

2. The external defibrillator system of claim 1, wherein the highlighting of the numerical value of the unit length of the determined sternal displacement comprises changing a color of the numerical value of the unit length of the determined sternal displacement.

3. The external defibrillator system of claim 1, wherein the processor is further configured to compare the compression rate to a predetermined maximum acceptable rate value and a predetermined minimum acceptable rate value and provide a visual indication of when the compression rate is above the predetermined maximum acceptable rate value or below the predetermined minimum acceptable rate value.

4. The system of claim 1, further comprising one or more electrodes for receiving information about the patient'"'"'s heart activity, and wherein the controller is configured to display on the display, with the numeric values, an electrocardiogram trace of the patient.

5. The system of claim 4, wherein displaying the electrocardiogram trace comprises moving the electrocardiogram trace laterally across the display.

6. The system of claim 4, wherein the controller is further configured to display an unfiltered electrocardiogram, determine that chest compressions have commenced on the patient, and subsequently display a filtered electrocardiogram.

7. The system of claim 4, further comprising one or more sensors for obtaining CO₂ data for the patient, wherein the controller is configured to display one or more numbers representing the CO₂ data along with the electrocardiogram.

8. The system of claim 1, wherein the controller is configured to determine the numeric value of the unit length of the determined sternal displacement during chest compressions by double integrating measurements from the accelerometer.

9. The system of claim 1, wherein the controller is further configured to display on the display an indication of an idle time since chest compressions were last detected.

10. The system of claim 1, wherein the controller is further configured to display on the display a visual indication indicative of whether the chest compressions are being performed properly.

11. The system of claim 10, wherein the visual indication indicative of whether the chest compressions are being performed properly is displayed adjacent to the one or more numeric values.

12. The system of claim 10, wherein the controller is configured to change a color of the visual indication based on whether the chest compressions are being performed properly or improperly.

13. The system of claim 10, wherein the visual indication comprises highlighting or font color of the displayed numeric values, and wherein the highlighting or the font color is based on whether the numeric value is within or outside of an acceptable range.

14. The system of claim 10, wherein the visual indication comprises a shape with an amount of fill in the shape differing based upon the determined sternal displacement and, optionally, the rate of chest compressions.

15. The system of claim 14, wherein the shape is fully filled when the determined sternal displacement and, optionally, the rate of chest compressions fall within acceptable ranges.

16. The system of claim 14, wherein the shape is partly filled when the determined sternal displacement and, optionally, the rate of chest compressions fall below acceptable ranges.

17. An external defibrillator system comprising:

a display;

an accelerometer comprised in a housing configured to be placed on a patient'"'"'s sternum for obtaining data comprising at least one of acceleration, velocity or displacement of the sternum as a result of chest compressions performed on the patient;

a processor configured to determine sternal displacement and compression rate from the data and to compare the sternal displacement to a predetermined maximum acceptable sternal displacement value and a predetermined minimum acceptable sternal displacement value for sternal displacement;

one or more sensors for obtaining CO₂ data for the patient;

one or more electrodes for receiving information about the patient'"'"'s heart activity; and

one or more sensors for obtaining SpO₂ data for the patient,

a controller configured to

display on the display one or more numeric values of a unit length of the determined sternal displacement during chest compressions, the displayed values having at least two significant figures and a resolution of less than an inch, provide a visual indication of when the determined sternal displacement is above the predetermined maximum acceptable sternal displacement value and when the determined sternal displacement is below the predetermined minimum acceptable sternal displacement value, the visual indication comprising highlighting of the numerical value of the unit length of the determined sternal displacement, and

display on the display one or more numeric values for compression rate, wherein the controller is configured to change between displaying one or more numbers representing the SPO₂ data and one or more numbers representing the CO₂ data in response to sensing that chest compressions have commenced on the patient.

18. A method for using an external defibrillator, the method comprising:

obtaining data from an accelerometer comprised in a housing configured to be placed on a patient'"'"'s sternum comprising at least one of acceleration, velocity or displacement of the sternum as a result of chest compressions performed on the patient;

determining sternal displacement and compression rate from the data and comparing the sternal displacement to a predetermined maximum acceptable sternal displacement value and a predetermined minimum acceptable sternal displacement value for sternal displacement; and

displaying on a display of the defibrillator one or more numeric values of a unit length of the determined sternal displacement during chest compressions, the displayed values having at least two significant figures and a resolution of less than an inch, providing a visual indication of when the determined sternal displacement is above the predetermined maximum acceptable sternal displacement value and when the determined sternal displacement is below the predetermined minimum acceptable sternal displacement value, the visual indication comprising highlighting of the numerical value of the unit length of the determined sternal displacement, and,

displaying on the display one or more numeric values for compression rate.

19. The method of claim 18, further comprising receiving information about the patient'"'"'s heart activity and displaying on the display, with the one or more numeric values, an electrocardiogram of the patient.

20. The method of claim 19, wherein displaying the electrocardiogram comprises moving an electrocardiogram trace laterally across the display.

21. The method of claim 20, further comprising displaying an unfiltered electrocardiogram, sensing that chest compressions have commenced on the patient, and subsequently displaying a filtered electrocardiogram.

22. The method of claim 19, further comprising determining one or more values for CO₂ of the patient, and displaying on the display indications of the one or more CO₂ values along with the electrocardiogram.

23. The method of claim 22, further comprising determining one or more values for SpO₂ of the patient.

24. The method of claim 23, further comprising changing from displaying one of the patient SPO₂ values or the patient CO₂ values to the other of the patient SpO₂ values or the patient CO₂ values.

25. The method of claim 18, further comprising determining the value for the sternal displacement by double integrating the measurements obtained from the accelerometer.

26. The method of claim 25, further comprising placing a pair of defibrillator electrodes on the patient, wherein the pair of electrodes is attached to a housing connected to the accelerometer.

33. The method of claim 18, further comprising determining values for CO₂ and SPO₂ of the patient and determining an SpO₂ waveform from the obtained SpO₂ values and a CO₂ waveform from the obtained CO₂ values.

34. The method of claim 33, further comprising receiving information about the patient'"'"'s heart activity, determining an electrocardiogram trace for the patient based on the heart activity information, and displaying an electrocardiogram trace on the display along with one of the SpO₂ waveform and the CO₂ waveform and the one or more numeric values for the determined sternal displacement and one or more numeric values for compression rate.

35. The method of claim 33, wherein displaying one of the SpO₂ waveform and the CO₂ waveform further comprises displaying an indication of whether the SpO₂ waveform or the CO₂ waveform is being displayed.

27. An external defibrillator system comprising:

a display;

an accelerometer comprised in a housing configured to be placed on a patient'"'"'s sternum for obtaining data comprising at least one of acceleration, velocity or displacement of the sternum as a result of chest compressions performed on the patient;

one or more sensors for obtaining CO₂ data for the patient;

one or more sensors for obtaining SpO₂ data for the patient;

a processor configured to determine sternal displacement and compression rate from the data and to compare the sternal displacement to a predetermined maximum acceptable sternal displacement value and a predetermined minimum acceptable sternal displacement value for sternal displacement; and

a controller configured to display on the display one or more numeric values of a unit length of the determined sternal displacement during chest compressions, the displayed values having at least two significant figures and a resolution of less than an inch, provide a visual indication of when the determined sternal displacement is above the predetermined maximum acceptable sternal displacement value and when the determined sternal displacement is below the predetermined minimum acceptable sternal displacement value, the visual indication comprising highlighting of the numerical value of the unit length of the determined sternal displacement, and display on the display one or more numeric values for compression rate, and wherein the controller is configured to determine a CO₂ waveform from the CO₂ data and an SpO₂ waveform from the SpO₂ data and to selectively change from displaying one of the SpO₂ waveform and the CO₂ waveform to the other of the SpO₂ waveform and the CO₂ waveform.

28. The system of claim 27, wherein changing from displaying the SpO₂ waveform to the CO₂ waveform is in response to determining that chest compressions have commenced on the patient.

29. The system of claim 27, wherein changing from displaying the CO₂ waveform to the SpO₂ waveform is in response to determining that chest compressions on the patient have ceased.

30. The system of claim 27, wherein the controller is further configured to display an indication of whether the SpO₂ waveform or the CO₂ waveform is being displayed.

31. The system of claim 27, further comprising one or more electrodes for receiving information about the patient'"'"'s heart activity, and wherein the controller is configured to display on the display an electrocardiogram trace of the patient along with one of the SpO₂ waveform and the CO₂ waveform and the one or more numeric values for the determined sternal displacement and one or more numeric values for compression rate.

32. The system of claim 31, wherein displaying one of an SpO₂ waveform or a CO₂ waveform and the electrocardiogram trace comprises displaying a full length electrocardiogram waveform and a partial length of the SpO₂ waveform or the CO₂ waveform.