Processing pulse signal in conjunction with accelerometer signal in cardiac resuscitation

• US 20060009809A1
• Filed: 09/15/2005
• Published: 01/12/2006
• Est. Priority Date: 04/23/2003
• Status: Active Grant

• 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.
• Granted Patent: US 7,488,293 B2
• Time in Patent Office: Days
• US Class Current: 607/5
• 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 1/3904 External heart defibrillators [EHD]
• CPC Class Codes: A61N 1/39044 in combination with cardiopulmonary resuscitation [CPR] therapy
• 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;

an accelerometer configured to detect chest movements of the patient during 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 and accelerometer output signal to monitor the effect that chest compressions have on the patient'"'"'s pulse.

4. The device of claim 1, 2, or 3 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.

5. The device of claim 4 wherein the memory and processing circuits are further configured to analyze the pulse sensor output signal in conjunction with the ECG signal to determine whether the patient has a pulse.

6. The device of claim 5 wherein the pulse rate of the pulse signal is compared to the pulse rate of the ECG signal.

7. The device of claim 1, 2, or 3 wherein the memory and processing circuits are configured to process the accelerometer output signal to determine the rate and depth of delivered chest compressions.

8. The device of claim 1, 2, or 3 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 4 wherein a decision whether to deliver a defibrillation waveform to the patient is based in part on whether processing of the ECG and pulse sensor output signals determines that the patient has a pulse.

10. The subject matter of claim 4 wherein the defibrillator comprises an automatic external defibrillator (AED).

11. The subject matter of claim 10 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 the patient has a pulse.

12. The subject matter of claim 4 wherein a determination of whether the patient has a pulse is undertaken after delivery of the defibrillation waveform, and the user is informed of the outcome of the determination.

13. The subject matter of claim 1, 2, or 3 wherein the memory and processor circuits are further configured to make a determination whether to administer CPR to the patient and the determination is based at least in part on whether it is determined that the patient has a pulse.

14. The subject matter of claim 1, 2, or 3 wherein the memory and processing circuits are further configured to use the pulse sensor output signal to determine the efficacy of CPR treatment of the patient.

2. 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;

an accelerometer configured to detect chest movements of the patient during 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 provide information to the user of the device to improve delivery of CPR to the patient.

3. 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;

an accelerometer configured to detect chest movements of the patient during 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 if chest compressions actually result in the movement of blood thus resulting in a pulse.