Automated external defibrillator operator interface

• US 5,792,190 A
• Filed: 11/17/1997
• Issued: 08/11/1998
• Est. Priority Date: 08/01/1995
• Status: Expired due to Term

• Current Assignee: Cardiac Science Operating Company (Cardica Incorporated)
• Original Assignee: SurVivaLink Corporation (Cardica Incorporated)
• Inventors: Anderson, Katherine H., Olson, Kenneth F., Kroll, Karl J. F., Gilman, Byron L.
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): LEYSON, JOSEPH S
• Application Number:
  US08/971,762
• Time in Patent Office: 267 Days
• Field of Search: 607/5, 607/6, 607/8
• US Class Current: 607/5
• CPC Class Codes: A61N 1/3904 External heart defibrillators [EHD]
• CPC Class Codes: A61N 1/3931 Protecting, e.g. back-up systems

Abstract

A portable automated external defibrillator (AED) configured for use with a packaged pair of defibrillator electrodes of the type electrically coupled to one another within the package and having lead wires extending from the package and an electrical connector on the ends of the lead wires. The AED includes a case with an electrode compartment configured to hold the packaged electrodes, and an openable lid for enclosing the compartment. Electrode terminals configured for electrical interconnection to the electrical connector of the electrodes, a speaker and an LED display are positioned within the electrode compartment. An operator-actuated rescue switch and a rescue LED display are positioned on the outside of the case. A high voltage circuit generates defibrillation pulses and applies the pulses to the electrode terminals. The operation of the AED is controlled by a digital control system. Rescue mode operation of the AED is initiated when the lid is opened. The digital control system then generates voice prompts and/or visual displays informing the operator: 1) when the electrodes are not properly connected to the electrode terminals, 2) when to place the electrodes on the patient, 3) when the electrodes are not properly positioned on the patient, 4) when the patient'"'"'s cardiac rhythm is being analyzed, 5) when an nonshockable rhythm is identified, 6) when the high voltage circuit is being charged, and 7) when a shockable rhythm is identified and the rescue switch can be actuated.

Claims

1. An automated external defibrillator, comprising:

a pair of defibrillator electrodes having a stored disposition and an operating disposition, the electrodes being disposed in an electrically conductive relationship in said stored disposition;

a case including an electrode compartment and an openable lid for enclosing the compartment, the compartment configured to hold the pair of defibrillator electrodes;

a lid switch for sensing when the lid is opened;

electrode terminals in the electrode compartment, the electrode terminals configured for electrical interconnection to the defibrillator electrodes;

a battery compartment and battery terminals in the case, the battery compartment and terminals and configured for holding and electrical interconnection to one or more batteries;

a high voltage circuit coupled to the battery terminals and the electrode terminals, for generating defibrillation pulses and applying the pulses to the electrode terminals;

an operator-actuated rescue switch on the case;

a rescue indicator on the case; and

a digital control system coupled to the lid switch, electrode terminals, high voltage circuit, rescue switch and rescue indicator, including;

rescue mode initiating means for initiating rescue operation of the defibrillator when the lid is opened;

rhythm analyzing means for analyzing signals present on the electrode terminals to identify a shockable cardiac rhythm;

rescue indicator actuating means for activating the rescue indicator when a shockable rhythm is identified; and

pulse initiating means for actuating the high voltage circuit and causing the generation of defibrillation pulses when a shockable rhythm is identified and the rescue switch is actuated;

resume indicator actuating means for actuating the resume indicator if rescue data is stored in the digital control system when the lid is opened; and

memory clearing means for clearing the rescue data from the digital control system when the resume button is actuated.

2. The defibrillator of claim 1 wherein the rescue indicator includes a speaker communicatively coupled to the digital control system for providing an audible voice prompt.

3. The defibrillator of claim 1 wherein the rescue indicator includes a visual display.

4. The defibrillator of claim 1 wherein:

the defibrillator further includes;

an impedance measuring circuit coupled between the electrode terminals and the digital control system, for measuring the impedance between the electrode terminals; and

a check electrodes indicator; and

the digital control system further includes electrode application checking means for identifying improper electrode placement on a patient and disconnection of at least one of the pair of electrodes from the patient as a function of the measured impedance between the electrode terminals, and for actuating the check electrodes indicator when improper electrode placement is identified.

5. The defibrillator of claim 4 wherein:

the defibrillator further includes an internal load coupled to the high voltage circuit; and

the electrode application checking means causes the high voltage circuit to dissipate any charge to the internal load when the measured impedance between the electrode terminals indicates an improper electrode placement or electrode disconnect.

6. The defibrillator of claim 4 wherein the check electrode indicator includes a speaker communicatively coupled to the digital control system for providing a voice prompt.

7. The defibrillator of claim 4 wherein the check electrode indicator includes a visual display.

8. The defibrillator of claim 4 wherein:

the digital control system further includes electrode checking means for identifying improper electrode connections to the electrode terminals and for identifying damaged electrodes as a function of the measured impedance between the electrode terminals, and actuates the check electrode indicator when improper electrode connections are identified.

9. The defibrillator of claim 1 wherein:

the defibrillator further includes an analyzing rhythm indicator; and

the digital control system further includes rhythm indicator actuating means for actuating the analyzing rhythm indicator when analyzing signals on the electrode terminals to identify a shockable rhythm.

10. The defibrillator of claim 9 wherein the analyzing rhythm indicator includes a speaker communicatively coupled to the digital control system for providing a voice prompt.

11. The defibrillator of claim 1 wherein:

the defibrillator further includes a nonshockable rhythm indicator; and

the digital control system further includes nonshockable indicator means for actuating the nonshockable rhythm indicator when an nonshockable rhythm is identified by the rhythm analyzing means.

12. The defibrillator of claim 11 wherein the nonshockable rhythm indicator includes a speaker communicatively coupled to the digital control system for providing a voice prompt.

13. The defibrillator of claim 1 wherein:

the defibrillator further includes a data communication port on the case coupled to the digital control system; and

the digital control system further includes;

event storage means for storing rescue data representative of the rescue operation of the defibrillator and/or monitored cardiac rhythms; and

rescue data transfer means for transferring the rescue data to the data communication port.

14. An automated external defibrillator, comprising:

a case including an electrode compartment and an openable lid for enclosing the compartment, the compartment configured to hold a pair of defibrillator electrodes;

a lid switch for sensing when the lid is opened;

electrode terminals in the electrode compartment, the electrode terminals configured for electrical interconnection to the defibrillator electrodes;

a battery compartment and battery terminals in the case, the battery compartment and terminals being configured for holding an electrical interconnection to one or more batteries;

a high voltage circuit coupled to the battery terminals and the electrode terminals, for generating defibrillation pulses and applying the pulses to the electrode terminals;

an operator-actuated rescue switch on the case;

a rescue indicator on the case;

a digital control system coupled to the lid switch, electrode terminals, high voltage circuit, rescue switch and rescue indicator;

a data communication port on the case coupled to the digital control system;

a resume indicator coupled to the digital control system;

an operator-actuated resume button coupled to the digital control system; and

the digital control system including;

rescue mode initiating means for initiating rescue operation of the defibrillator when the lid is opened;

rhythm analyzing means for analyzing signals present on the electrode terminals to identify a shockable cardiac rhythm;

rescue indicator actuating means for activating the rescue indicator when a shockable rhythm is identified;

pulse initiating means for actuating the high voltage circuit and causing the generation of defibrillation pulses when a shockable rhythm is identified and the rescue switch is actuated;

event storage means for storing rescue data representative of the rescue operation of the defibrillator and/or monitored cardiac rhythms;

rescue data transfer means for transferring the rescue data to the data communication port;

resume indicator actuating means for actuating the resume indicator if rescue data is stored in the digital control system when the lid is opened; and

memory clearing means for clearing the rescue data from the digital control system when the resume button is actuated.

15. The defibrillator of claim 14 wherein the resume indicator includes a speaker communicatively coupled to the digital control system for providing a voice prompt.

16. The defibrillator of claim 14 wherein the resume indicator includes a visual display.

17. An automated external defibrillator, comprising:

a case including an electrode compartment and an openable lid for enclosing the compartment, the compartment configured to hold a pair of defibrillator electrodes;

electrode terminals on the case configured for electrical interconnection to defibrillator electrodes;

a battery compartment and battery terminals in the case, the battery compartment and terminals configured for holding and for electrical interconnection to one or more batteries;

a high voltage circuit coupled to the battery terminals and the electrode terminals, for generating defibrillation pulses and applying the pulses to the electrode terminals;

an on/off switch on the case;

an operator-actuated rescue switch on the case;

a rescue indicator on the case; and

a digital control system coupled to the on/off switch, electrode terminals, high voltage circuit, rescue switch and rescue indicator, including;

rescue mode initiating means for initiating rescue operation of the defibrillator when the on/off switch is actuated;

rhythm analyzing means for analyzing signals present on the electrode terminals to identify a shockable cardiac rhythm after the on/off switch is actuated;

rescue indicator actuating means for activating the rescue indicator when a shockable rhythm is identified;

pulse initiating means for actuating the high voltage circuit and causing the generation of defibrillation pulses when a shockable rhythm is identified and the rescue switch is actuated;

a resume indicator coupled to the digital control system;

an operator-actuated resume button coupled to the digital control system;

resume indicator actuating means for actuating the resume indicator if rescue data is stored in the digital control system when the lid is opened; and

memory clearing means for clearing the rescue data from the digital control system when the resume button is actuated.

18. The defibrillator of claim 17 wherein:

the on/off switch includes a lid switch for sensing when the lid is opened; and

the rescue mode initiating means is responsive to the lid switch and initiates rescue mode operation of the defibrillator when the lid is opened.

19. The defibrillator of claim 17 wherein:

the defibrillator further includes an impedance measuring circuit coupled to the electrode terminals and the digital control system, for measuring the impedance between the electrode terminals in both the stored disposition and the operating disposition;

the digital control system further includes electrode application checking means for identifying improper electrode placement on a patient as a function of the measured impedance between the electrode terminals when the electrodes are in the operating disposition; and

the rhythm analyzing means includes means for automatically initiating the analysis of signals present on the electrode terminals when proper electrode placement is identified by the electrode application checking means.

20. The defibrillator of claim 19 wherein:

the defibrillator further includes a check electrodes indicator; and

the electrode application checking means actuates the check electrode indicator when improper electrode placement on the patient or a disconnect of at least on electrode from the patient is identified.

21. The defibrillator of claim 17 wherein:

the defibrillator further includes a place electrodes indicator; and

the digital control system further includes a place electrodes indicator actuating means for actuating the place electrodes indicator after the on/off switch is actuated and before analyzing signals present on the electrode terminals.

22. The defibrillator of claim 21 wherein:

the defibrillator further includes an impedance measuring circuit coupled to the electrode terminals and the digital control system, for measuring the impedance between the electrode terminals;

the digital control system further includes electrode application checking means for identifying improper electrode placement on a patient as a function of the measured impedance between the electrode terminals; and

the rhythm analyzing means includes means for automatically initiating the analysis of signals present on the electrode terminals when proper electrode placement is identified by the electrode checking means.

23. The defibrillator of claim 22 wherein:

the defibrillator is configured for use with a pair of packaged electrodes electrically coupled to one another within the package; and

the digital control system further includes electrode connection checking means for identifying improper electrode connections to the electrode terminals as a function of the measured impedance between the electrode terminals, and actuates the check electrode indicator when improper electrode connections are identified.

24. An automated external defibrillator, comprising:

a pair of defibrillator electrodes having a stored disposition and an operating disposition, the electrodes being disposed in an electrically conductive relationship in said stored disposition;

a case;

electrode terminals on the case configured for electrical interconnection to the defibrillator electrodes;

a battery compartment and battery terminals in the case, the battery compartment and terminals configured for holding and for electrical interconnection to one or more batteries;

a high voltage circuit coupled to the battery terminals and the electrode terminals, for generating defibrillation pulses and applying the pulses to the electrode terminals;

an impedance measuring circuit coupled to the electrode terminals, for measuring the impedance between the electrode terminals;

an on/off switch on the case;

an operator-actuated rescue switch on the case;

a rescue indicator on the case;

a digital control system coupled to the on/off switch, electrode terminals, high voltage circuit, rescue switch, impedance measuring circuit and rescue indicator;

a resume indicator coupled to the digital control system;

an operator-actuated resume button coupled to the digital control system; and

the digital control system including;

rescue mode initiating means for initiating rescue operation of the defibrillator when the on/off switch is actuated;

electrode application checking means for identifying improper electrode placement on a patient as a function of the measured impedance between the electrode terminals;

rhythm analyzing means for automatically analyzing signals present on the electrode terminals to identify a shockable cardiac rhythm when proper electrode placement is identified;

rescue indicator actuating means for activating the rescue indicator when a shockable rhythm is identified;

pulse initiating means for actuating the high voltage circuit and causing the generation of defibrillation pulses when a shockable rhythm is identified and the rescue switch is actuated;

resume indicator actuating means for actuating the resume indicator if rescue data is stored in the digital control system when the lid is opened; and

memory clearing means for clearing the rescue data from the digital control system when the resume button is actuated.

25. The defibrillator of claim 24 wherein:

the defibrillator further includes a place electrodes indicator; and

the digital control system further includes place electrodes indicator actuating means for actuating the place electrodes indicator after the on/off switch is actuated and before analyzing signals present on the electrode terminals.

26. The defibrillator of claim 24 wherein:

the defibrillator further includes a check electrodes indicator; and

the electrode application checking means actuates the check electrodes indicator when improper electrode placement is identified.