Defibrillator display

• US 8,880,166 B2
• Filed: 02/11/2011
• Issued: 11/04/2014
• 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:
  US13/025,348
• Publication Number:
  US 20110202100A1
• Time in Patent Office: 1,362 Days
• Field of Search: 607 3- 6
• US Class Current: 607/3
• 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 5/318 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

Systems and methods related to the field of cardiac resuscitation, and in particular to devices for assisting rescuers in performing cardio-pulmonary resuscitation (CPR) are described herein.

Claims

1. A method for monitoring patient activity using an external defibrillator, the method comprising:

obtaining data regarding chest compressions performed on the patient;

determining values for depth and rate of a plurality of the chest compressions;

during the presence of chest compressions, displaying on a first portion of a graphical display screen of the defibrillator information associated with the administration of the chest compressions including a visual indicia of compression depth relative to a target depth on a per-compression basis and an icon adjacent the indicia that indicates whether the chest compressions are being performed at an acceptable depth and rate based on the determined values for depth and rate;

detecting the absence of chest compressions; and

upon detecting the absence of chest compressions, replacing, and not displaying, the information associated with the administration of the chest compressions that is displayed on the first portion of the graphical display screen of the defibrillator with an idle time timer that is displayed on the first portion of the graphical display screen.

2. The method of claim 1, wherein determining the values for depth and rate comprises determining numeric values in terms of distance for depth and compressions per minute for rate, and the method further comprises displaying numbers that correspond to the determined numeric values.

3. The method of claim 1, wherein a color of the icon changes based on whether the chest compressions are being performed properly or improperly.

4. The method of claim 1, further comprising receiving information about the patient'"'"'s heart activity and displaying on the graphical display an electrocardiogram of the patient.

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

6. The method of claim 5, wherein displaying the electrocardiogram comprises:

displaying an unfiltered electrocardiogram in the absence of chest compressions,

sensing that chest compressions have commenced on the patient, and

subsequently displaying a filtered electrocardiogram.

7. The method of claim 6, wherein subsequently displaying the filtered electrocardiogram comprises:

momentarily displaying on the trace of the electrocardiogram, an unfiltered portion showing compression artifacts, between another unfiltered portion obtained prior to sensing that chest compressions have commenced and a filtered portion.

8. The method of claim 1, further comprising displaying second data from the patient in coordination with the electrocardiogram.

9. The method of claim 8, further comprising changing a source of the second data in response to sensing that chest compressions have commenced on the patient.

10. The method of claim 8, wherein displaying second data from the patient in coordination with the electrocardiogram comprises:

displaying information associated with SPO₂ data;

sensing that chest compressions have commenced on the patient; and

changing the source of the second data from SPO₂ data to CO₂ data and displaying information associated with CO₂ data.

11. The method of claim 8, wherein displaying second data from the patient in coordination with the electrocardiogram comprises:

displaying information associated with a measured patient chemical measurement;

changing the source of the second data comprises changing from the patient chemical measurement to a chest compression measurement that is based at least in part on the determined values for depth and rate.

12. The method of claim 11, wherein the chest compression measurement is displayed in the form of a bar graph.

13. The method of claim 12, wherein lengths of bars in the bar graph represent compression depths and spacing of bars in the bar graph represent compression rate.

14. The method of claim 13, further comprising displaying indicators for standard depth and rate with the bar graph.

15. The method of claim 1, wherein obtaining the data regarding chest compressions performed on the patient comprises obtaining measurements from an accelerometer that is positioned to move in coordination with the patient'"'"'s breastbone.

16. The method of claim 15, wherein determining a value for depth comprises double integrating measurements from the accelerometer.

17. The method of claim 1, wherein the accelerometer is attached to a housing that is in turn attached to a pair of defibrillator electrodes to be placed on the patient.

18. An external defibrillator, comprising:

one or more sensors arranged to contact a patient and obtain measurements regarding chest compressions performed on the patient;

a video display screen for displaying graphical representations regarding status of the patient and the defibrillator to a rescuer;

a memory that stores computer instructions; and

a processor connected to the memory that stores computer instructions for;

determining values of depth and rate of chest compressions performed on the patient and sensed by the sensors, and

causing the video display screen to display information associated with the administration of the chest compressions including a visual indicia of compression depth relative to a target depth on a per-compression basis and an icon adjacent the indicia that indicates whether the chest compressions are being performed at an acceptable depth and rate based on the determined values for depth and rate during the presence of chest compressions;

detecting the absence of chest compressions; and

upon detecting the absence of chest compressions, replacing, and not displaying, the information associated with the administration of the chest compressions that is displayed on the graphical display screen of the defibrillator with an idle time timer that is displayed on the first portion of the graphical display screen.

19. The external defibrillator of claim 18, wherein determining the values for depth and rate comprises determining numeric values in terms of distance for depth and compressions per minute for rate, and the method further comprises displaying numbers that correspond to the determined numeric values.

20. The external defibrillator of claim 18, wherein a color of the icon changes based on whether the chest compressions are being performed properly or improperly.

21. The external defibrillator of claim 18, further comprising one or more sensors arranged to obtain an electrocardiogram of the patient wherein the instructions are further provided to display on the video display screen the electrocardiogram of the patient in response to receiving information about the patient'"'"'s heart activity.

22. The external defibrillator of claim 21, wherein displaying the electrocardiogram comprises moving an electrocardiogram trace laterally across the display.

23. The external defibrillator of claim 22, wherein the instructions are further provided to display on the video display screen an unfiltered electrocardiogram prior to sensing that chest compressions have commenced, and display a filtered electrocardiogram upon sensing that chest compressions have commenced on the patient.

24. The external defibrillator of claim 23, wherein the instructions are further provided to momentarily display on the trace of the electrocardiogram, an unfiltered portion showing compression artifacts, between another unfiltered portion obtained prior to sensing that chest compressions have commenced and a filtered portion.

25. The external defibrillator of claim 22, wherein the instructions are further provided to display second data from the patient in coordination with the electrocardiogram.

26. The external defibrillator of claim 25, wherein the instructions are further provided to change a source of the second data in response to sensing that chest compressions have commenced on the patient.

27. The external defibrillator of claim 25, wherein the instructions further comprise instructions to:

display information associated with SPO₂ data;

sense that chest compressions have commenced on the patient; and

change the source of the second data from SPO₂ data to CO₂ data and display information associated with CO₂ data.

28. The external defibrillator of claim 25, the instructions further comprise instructions to:

display information associated with a measured patient chemical measurement;

change the source of the second data from a patient chemical measurement to a chest compression measurement that is based at least in part on the determined values for depth and rate.

29. The external defibrillator of claim 28, wherein the chest compression measurement is displayed in the form of a bar graph.

30. The external defibrillator of claim 29, wherein lengths of bars in the bar graph represent compression depths and spacing of bars in the bar graph represent compression rate.

31. The external defibrillator of claim 30, wherein the instructions are further provided to display indicators for standard depth and rate with the bar graph.

32. The external defibrillator of claim 18, further comprising an accelerometer configured to obtain the data regarding chest compressions performed on the patient, the accelerometer configured to be positioned to move in coordination with the patient'"'"'s breastbone.

33. The external defibrillator of claim 32, wherein determining a value for depth comprises double integrating measurements from the accelerometer.

34. The external defibrillator of claim 18, further comprising a pair of defibrillator electrodes wherein the one or more sensors comprise an accelerometer that is attached to a housing that is in turn attached to the pair of defibrillator electrodes.

35. An external defibrillator, comprising:

one or more sensors arranged to contact a patient and obtain measurements regarding chest compressions performed on the patient;

a video display screen for displaying graphical representations regarding status of the patient and the defibrillator to a rescuer; and

means for determining values of depth and rate of the chest compressions and for causing the video display screen to display information associated with the administration of the chest compressions including a visual indicia of compression depth relative to a target depth on a per-compression basis in response to receiving data from the one or more sensors that indicates the depth and rate of the chest compressions, and for displaying an icon adjacent the indicia that indicates whether the chest compressions are being performed at an acceptable depth and rate based on the determined values for depth and rate; and

, upon detecting the absence of chest compressions, replacing, and not displaying, the information associated with the administration of the chest compressions that is displayed on the first portion of the graphical display screen of the defibrillator with an idle time timer that is displayed on the first portion of the graphical display screen.