External Defibrillator With Pre-Cpr-Ecg Based Defibrillating Shock

• US 20070213775A1
• Filed: 08/09/2005
• Published: 09/13/2007
• Est. Priority Date: 07/19/2005
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Snyder, David
• Application Number:
  US11/573,103
• Publication Number:
  US 20070213775A1
• Time in Patent Office: Days
• US Class Current: 607/7
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting
• CPC Class Codes: A61N 1/3987 characterised by the timing or triggering of the shock
• CPC Class Codes: G09B 23/288 for artificial respiration or heart massage

Abstract

A defibrillator having a pair of electrodes for delivering an artifact-compensated defibrillation shock and a method thereof is provided. Electrocardiographic (ECG) data representative of an ECG signal is acquired for the patient and the ECG data is analyzed to determine whether administration of a defibrillating shock is appropriate. A cardio-pulmonary resuscitation (CPR) interval is initiated subsequent to the acquisition of ECG data. Upon completion of the CPR interval, and if administration of a defibrillating shock is determined to be appropriate from the ECG data, arming the AED for delivery of the defibrillation shock to the patient.

Claims

1. A method for delivering a defibrillation shock to a patient from a defibrillator, the method comprising:

acquiring electrocardiographic (ECG) data representative of an ECG signal for the patient;

analyzing the ECG data to determine whether administration of a defibrillating shock is appropriate;

initiating a cardio-pulmonary resuscitation (CPR) interval subsequent to the acquisition of ECG data, CPR compressions administered to the patient for at least a portion of the CPR interval; and

in response to the completion of the CPR interval and if administration of a defibrillating shock is determined to be appropriate from the ECG data, arming the AED for delivery of the defibrillation shock to the patient.

2. The method of claim 1 wherein analyzing the ECG data to determine whether administration of a defibrillating shock is appropriate is completed before the CPR interval is concluded.

3. The method of claim 1 wherein analyzing the ECG data to determine whether administration of the defibrillating shock is appropriate comprises detecting at least one of ventricular fibrillation and ventricular tachycardia from the ECG data.

4. The method of claim 1 wherein acquiring ECG data representative of an ECG signal comprises:

obtaining an ECG signal;

determining whether the ECG signal is corrupted by movement of the patient; and

obtaining another ECG signal until an uncorrupted signal is acquired.

5. The method of claim 1, further comprising delivering the defibrillating shock to the patient subsequent to arming of the AED.

6. The method of claim 1, further comprising detecting an indication of CPR cessation prior to arming the AED.

7. The method of claim 1, further comprising providing alternative care recommendations in response to the completion of the CPR interval and if administration of a defibrillating shock is determined to be inappropriate.

8. A method for timing the delivery of a defibrillating shock from an automatic external defibrillator (AED), the method comprising:

acquiring an ECG signal prior to initiation of a CPR interval;

prior to the completion of the CPR interval, determining whether delivery of a defibrillating shock is appropriate; and

arming the AED for delivery of a defibrillating shock upon completion of the CPR interval if delivery of the defibrillating shock is determined to be appropriate,

otherwise, delaying AED arming and acquiring and analyzing an ECG signal upon completion of the CPR interval if delivery of the defibrillating shock is determined, based upon an ECG signal acquired prior to the CPR interval, to be inappropriate.

9. The method of claim 8 wherein analyzing the ECG signal prior to initiation of a CPR interval comprises analyzing an ECG signal subsequent to completion of a previous CPR interval.

10. The method of claim 8 wherein analyzing the ECG signal prior to initiation of a CPR interval comprises analyzing an ECG signal immediately prior to the initiation of a CPR interval.

11. The method of claim 8 wherein determining whether delivery of a defibrillating shock is appropriate comprises detecting at least one of ventricular fibrillation and ventricular tachycardia from the ECG signal analysis.

12. The method of claim 8, further comprising fully charging a charging capacitor prior to the completion of the CPR interval.

13. The method of claim 8, further comprising detecting an indication of CPR cessation prior to arming the AED and wherein arming the AED for delivery of the defibrillating shock occurs immediately after CPR cessation is detected.

14. The method of claim 8, further comprising triggering the AED to deliver the defibrillating shock to a patient subsequent to arming of the AED.

15. A defibrillator for delivering a defibrillating shock, the defibrillator comprising:

an energy delivery unit configured to provide a defibrillating shock after being armed;

an electrocardiographic (ECG) analysis unit configured to acquire an ECG signal and analyze the same, the ECG analysis unit generating a shock appropriate signal in response to determining that delivery of a defibrillating shock is appropriate based on the ECG signal analysis;

a cardiopulmonary resuscitation (CPR) interval timer coupled to the ECG analysis unit and configured to initiate a CPR interval after acquisition of the ECG signal and generate a time-out signal in response to the completion of the CPR interval; and

an arming circuit coupled to the ECG analysis unit, the CPR interval timer, and the energy delivery unit and configured to arm the energy delivery unit to deliver the defibrillating shock in response to receiving the shock appropriate signal and the time-out signal.

16. The defibrillator of claim 15, further comprising a charging circuit coupled to the energy delivery unit to fully charge the energy delivery unit prior to the completion of the CPR interval.

17. The defibrillator of claim 15, further comprising a detector circuit coupled to the arming circuit to enable the arming circuit to arm the energy delivery unit in response to detecting cessation of CPR activity.

18. The defibrillator of claim 15 wherein the ECG analysis unit is configured to generate the shock appropriate signal responsive to detecting at least one of ventricular fibrillation and ventricular tachycardia from the ECG signal.

19. The defibrillator of claim 15 wherein the ECG analysis unit comprises an ECG signal acquisition unit configured to obtain an ECG signal, determine whether the ECG signal is corrupted by movement, and obtain another ECG signal until an uncorrupted ECG signal is acquired.

20. The defibrillator of claim 15 wherein the ECG analysis unit is configured to complete analysis of the ECG signal prior to generating the shock appropriate signal.