External defibrillator with shock activated by cessation of precordial compressions

• US 9,717,924 B2
• Filed: 09/21/2015
• Issued: 08/01/2017
• Est. Priority Date: 12/13/2002
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Snyder, David
• Primary Examiner(s): Johnson, Nicole F
• Application Number:
  US14/859,431
• Publication Number:
  US 20160008613A1
• Time in Patent Office: 680 Days
• Field of Search: 607 5, 600509
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/308 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/361 Detecting fibrillation
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• CPC Class Codes: A61B 5/726 using Wavelet transforms
• CPC Class Codes: A61N 1/39044 in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting

Abstract

A defibrillator having a pair of electrodes for delivering an artifact-compensated defibrillation shock and a method thereof is provided. The defibrillator can be deployed rapidly while administering a cardio-pulmonary resuscitation (CPR) on the patient. Upon detection of an end of the CPR operation, a correlation signal indicative of signal corruption is detected and analyzed rapidly to determine an appropriate energy level discharged across the pair of electrodes. Thereafter, a notification signal is sent to the user of the defibrillator prior to delivering the defibrillation shock to the patient. The artifact-compensated defibrillation shock is delivered if for a predetermined period of time no movement is detected.

Claims

1. A method for applying electrotherapy in an automatic external defibrillator having a high voltage energy source, an ECG detector, and a CPR therapy module, the method comprising the steps of:

prompting a start of a CPR therapy interval;

detecting an indication of CPR cessation; and

,

arming the AED for electrotherapy shock based on the detecting step.

2. The electrotherapy method of claim 1, wherein the arming step is complete in less than about 10 seconds from detection of the indication.

3. The electrotherapy method of claim 1, wherein the indication is based upon a predetermined end of the CPR therapy interval.

4. The electrotherapy method of claim 3, wherein the arming step includes initiating a charging of the high voltage energy source prior to the predetermined end of the CPR therapy interval.

5. The electrotherapy method of claim 3, wherein the arming step includes completing a charging of the high voltage energy source prior to the predetermined end of the CPR therapy interval.

6. The electrotherapy method of claim 3, further comprising the steps of:

obtaining an ECG signal from the ECG detector prior to the end of the CPR therapy interval; and

determining whether the ECG signal is corrupted by CPR activity, wherein the arming step is further based on determining an uncorrupted ECG signal.

7. The electrotherapy method of claim 1, wherein the indication of CPR cessation includes a signal generated by CPR activity.

8. The electrotherapy method of claim 7, further comprising the steps of:

obtaining an ECG signal from the ECG detector prior to the CPR cessation;

determining whether the ECG signal is uncorrupted by CPR activity;

wherein the arming step is further based on the determining step.

9. A defibrillator comprising:

a CPR prompting system arranged to prompt a start of a CPR delivery interval;

a detector arranged to detect a signal indicating a cessation of CPR delivery;

an energy delivery unit arranged to provide a defibrillation shock;

a charging circuit arranged to charge the energy delivery unit; and

,

a controller arranged to (i) control the charging circuit to charge the energy delivery unit and (ii) arm the energy delivery unit for providing the defibrillation shock at a desired charge level, in response to the signal indicating the cessation of CPR delivery.

10. The defibrillator of claim 9 wherein an interval between receiving the signal and charging the energy delivery unit is less than about 10 seconds.

11. The defibrillator of claim 9, wherein the signal further includes a completion signal indicating an end of a predetermined CPR delivery interval.

12. The defibrillator of claim 11, wherein the controller activates the charging circuit prior to the end of the predetermined CPR delivery interval.

13. The defibrillator of claim 12, wherein the controller controls the charging circuit to charge the energy source to a final value prior to the end of the predetermined CPR delivery interval.

14. The defibrillator of claim 9, wherein the detector is also arranged to detect an ECG rhythm signal.

15. The defibrillator of claim 9, wherein the signal includes a component indicative of CPR motion.

16. The defibrillator of claim 15, further comprising:

an ECG detector arranged to obtain an ECG signal prior to the cessation of CPR, wherein the controller further charges the energy delivery unit responsive to a detection of a shockable ECG rhythm.