Processing pulse signal in conjunction with accelerometer signal in cardiac resuscitation

• US RE44,187 E1
• Filed: 02/10/2011
• Issued: 04/30/2013
• Est. Priority Date: 04/23/2003
• Status: Expired due to Fees

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Inventors: Marcovecchio, Alan F., Geheb, Frederick, Boucher, Donald R.
• Primary Examiner(s): Schaetzle, Kennedy
• Application Number:
  US13/025,124
• Time in Patent Office: 810 Days
• Field of Search: None
• US Class Current: 600/504
• 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 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• 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: A61H 31/00 Artificial respiration or heart stimulation, e.g. heart massage artificial respiration by treatment with gas or air, e.g. mouth-to-mouth respiration A61M16/00; applying electric currents by contact electrodes for stimulation, e.g. heart pace-makers A61N1/36 ; teaching or training models, demonstration models for medical purposes G09B23/288
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: A61N 1/39 Heart defibrillators
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting

Abstract

A cardiac resuscitation device that includes a pulse sensor configured to detect pulse information characterizing the cardiac pulse in the patient, an accelerometer configured to detect chest movements of the patient during chest compressions, and memory and processing circuits configured to process the outputs of the pulse sensor and accelerometer to monitor the effect that chest compressions have on the patient'"'"'s pulse.

Claims

1. A cardiac resuscitation device, comprising

a pulse sensor configured to detect pulse information characterizing the cardiac pulse in the patient, wherein the pulse sensor has a pulse sensor output signal as its output, and wherein the pulse sensor output signal contains information characterizing individual pulses, each corresponding to movement of blood in the patient'"'"'s circulatory system;

an accelerometer configured to detect chest movements of the patient during a series of individual chest compressions, wherein the accelerometer has an accelerometer output signal as its output; and

memory and processing circuits configured to process the pulse sensor output signal in conjunction with the accelerometer output signal to determine, for each of a plurality of individual chest compressions in the series of individual chest compressions, if the individual chest compression actually caused movement of blood thus resulting in an individual pulse.

2. The device of claim 1 wherein the device comprises a defibrillator for delivering a defibrillation waveform to the patient and chest electrodes for detecting at least one LCG signal on the patient and for delivering a defibrillation waveform to the patient.

3. The device of claim 2 wherein the memory and processing circuits are further configured to analyze the pulse sensor output signal in conjunction with the ECG signal.

4. The device of claim 3 wherein the pulse rate of the pulse signal is compared to the pulse rate of the ECG signal.

5. The subject matter of claim 2 wherein the defibrillator comprises an automatic external defibrillator (AED).

6. The subject matter of claim 5 further comprising the capability to provide the user with prompts for performing CPR, and wherein the prompts are dependent at least in part on whether the processing of the pulse signal determines that individual chest compressions actually cause movements of blood and thus individual pulses.

7. The device of claim 1 wherein the memory and processing circuits are configured to process the accelerometer output signal to determine the rate and depth of delivered individual chest compressions.

8. The device of claim 1 wherein the memory and processing circuits are configured to process the pulse sensor output signal to determine the magnitude and frequency of the patient'"'"'s pulse.

9. The subject matter of claim 1 wherein the memory and processing circuits are further configured to determine the efficacy of CPR treatment of the patient.

10. A cardiac resuscitation device, comprising

a pulse sensor configured to detect pulse information characterizing the cardiac pulse in the patient, wherein the pulse sensor has a pulse sensor output signal as its output, and wherein the pulse sensor output signal contains information characterizing individual pulses, each corresponding to movement of blood in the patient'"'"'s circulatory system;

a sensor configured to detect chest movements of the patient during a series of individual chest compressions, wherein the sensor has a sensor output signal as its output; and

memory and processing circuits configured to process the pulse sensor output signal in conjunction with the sensor output signal to determine, for each of a plurality of individual chest compressions in the series of individual chest compressions, if the individual chest compression actually caused movement of blood thus resulting in an individual pulse.

11. The device of claim 10 wherein the device comprises a defibrillator for delivering a defibrillation waveform to the patient and chest electrodes for detecting at least one ECG signal on the patient and for delivering a defibrillation waveform to the patient.

12. The device of claim 11 wherein the memory and processing circuits are further configured to analyze the pulse sensor output signal in conjunction with the ECG signal.

13. The device of claim 12 wherein the pulse rate of the pulse signal is compared to the pulse rate of the ECG signal.

14. The subject matter of claim 11 wherein the defibrillator comprises an automatic external defibrillator (AED).

15. The subject matter of claim 14 further comprising the capability to provide the user with prompts for performing CPR, and wherein the prompts are dependent at least in part on whether the processing of the pulse signal determines that individual chest compressions actually cause movements of blood and thus individual pulses.

16. The device of claim 10 wherein the memory and processing circuits are configured to process the sensor output signal to determine the rate and depth of delivered individual chest compressions.

17. The device of claim 10 wherein the memory and processing circuits are configured to process the pulse sensor output signal to determine the magnitude and frequency of the patient'"'"'s pulse.

18. The subject matter of claim 10 wherein the memory and processing circuits are further configured to determine the efficacy of CPR treatment of the patient.