Cardiac arrest monitor and alarm system

• US 20050065445A1
• Filed: 11/03/2004
• Published: 03/24/2005
• Est. Priority Date: 05/22/2001
• Status: Abandoned Application

• Current Assignee: AJ Medical Devices, Inc.
• Original Assignee: AJ Medical Devices, Inc.
• Inventors: Jenkins, Janice M., Arzbaecher, Robert C., Garrett, Michael C.
• Application Number:
  US10/979,995
• Publication Number:
  US 20050065445A1
• Time in Patent Office: Days
• US Class Current: 600/515
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle

Abstract

A cardiac arrest monitor and alarm system including an implantable medical device having at least three electrodes, preferably but not necessarily subcutaneous, positioned with respect to a heart organ and forming an orthogonal lead configuration to continuously monitor an electrocardiographic signal of the heart organ. A microdevice, preferably but not necessarily operatively connected to the medical device, detects a deviation from a normal heart electrical activity and emits a signal to an external receiver. Upon verification of the signal from the microdevice, the external receiver activates a programmed annunciator circuit to alert bystanders to deploy an AED and/or activate a communication link automatically transmitting an alarm and the electrocardiographic signal to a remote transceiver.

Claims

1. A cardiac arrest monitor and alarm system comprising:

a medical device having at least three electrodes positioned with respect to a heart organ and forming an orthogonal lead configuration to monitor an electrocardiographic signal of the heart organ;

a microdevice operatively connected to the medical device, each of the at least three electrodes positioned on an exterior surface of the microdevice, the microdevice detecting a deviation from a normal heart electrical activity; and

a plurality of external receivers, at least one of the external receivers detecting a signal from the microdevice and activating a programmed annunciator circuit to activate a local alarm, and activate a communication link automatically transmitting an alarm and the electrocardiographic signal to a remote transceiver.

2. The cardiac arrest monitor and alarm system of claim 1, wherein the medical device is subcutaneous.

3. The cardiac arrest monitor and alarm system of claim 1, wherein the medical device is on a body surface of a patient.

4. The cardiac arrest monitor and alarm system of claim 1, wherein the microdevice is implantable.

5. The cardiac arrest monitor and alarm system of claim 1, wherein the medical device communicates with a position identifier that provides a position of a patient.

6. The cardiac arrest monitor and alarm system of claim 1 wherein the deviation from the normal heart electrical activity is detected with an algorithm that monitors the normal heart electrical activity.

7. The cardiac arrest monitor and alarm system of claim 1 wherein the microdevice comprises a subcutaneous transmitter, and the subcutaneous transmitter is activatable upon detection of the deviation from the normal heart electrical activity to transmit a warning signal and the electrocardiographic signal to at least one external receiver.

8. The cardiac arrest monitor and alarm system of claim 1 wherein the microdevice comprises a plurality of sense amplifiers each receiving an electrocardiographic signal and each emitting an amplified and digitized electrocardiographic signal to a microcontroller within the microdevice.

9. The cardiac arrest monitor and alarm system of claim 8 further comprising an antenna mounted with respect to the microdevice and operatively connected to the microcontroller.

10. The cardiac arrest monitor and alarm system of claim 1 wherein the remote transceiver comprises a telephone, and the communication link automatically transmits the alarm and the electrocardiographic signal to the telephone programmed to automatically call at least one of an Emergency Medical Service, a Patient Monitoring Service and a rescuer.

11. The cardiac arrest monitor and alarm system of claim 1 wherein each external receiver further comprises a processor operatively connected to memory for analyzing the electrocardiographic signal and storing episodes of electrocardiographic signals and further processing and verification.

12. The cardiac arrest monitor and alarm system of claim 1 wherein each external receiver comprises a GPS, activatable when the alarm is transmitted by the communication link to the remote transceiver.

13. The cardiac arrest monitor and alarm system of claim 1, wherein a location of a patient is identified using a least one of a triangulation calculation and a time-of-flight calculation.

14. The cardiac arrest monitor and alarm system of claim 1, wherein a location of a patient is identified using a triangulation calculation with cellular phone technology.

15. A cardiac arrest monitor and alarm system comprising:

a medical device having at least three electrodes positioned with respect to a patient'"'"'s heart forming an orthogonal lead configuration monitoring an electrocardiographic signal of the patient'"'"'s heart;

a microdevice operatively connected to the medical device, the microdevice analyzing the electrocardiographic signal and detecting a deviation from a normal heart electrical activity; and

a plurality of external receivers each electromagnetically connected to the microdevice, at least one external receiver detecting a signal from the microdevice and forwarding the signal to a telephone to activate a communication link with a remote transceiver, the microdevice comprising a plurality of sense amplifiers each receiving an electrocardiographic signal from one of an orthogonal lead and each sense amplifier emitting an amplified and digitized electrocardiographic signal to a microcontroller.

16. The cardiac arrest monitor and alarm system of claim 15, wherein the medical device is subcutaneous.

17. The cardiac arrest monitor and alarm system of claim 15 wherein the medical device is on a body surface of a patient.

18. The cardiac arrest monitor and alarm system of claim 15, wherein the microdevice is implantable.

19. The cardiac arrest monitor and alarm system of claim 15 wherein the telephone is programmed to automatically dial an emergency rescuer upon receiving the signal from at least one external receiver.

20. The cardiac arrest monitor and alarm system of claim 15 further comprising a short-wave radio operatively connected to each external receiver and transmitting the signal to the telephone.

21. The cardiac arrest monitor and alarm system of claim 15 further comprising a modulated carrier operatively connected to each external receiver and forwarding the signal to the telephone.

22. The cardiac arrest monitor and alarm system of claim 15 wherein each of the at least three electrodes is positioned on an exterior surface of the microdevice.

23. The cardiac arrest monitor and alarm system of claim 15 wherein the communication link transmits a heart electrocardiographic signal to the remote transceiver and provides a position identifier for locating a patient.

24. A method for detecting a deviation from a normal heart electrical activity and transmitting an alarm upon detecting the deviation, the method comprising:

monitoring an electrocardiographic signal of a heart organ using a medical device;

amplifying and digitizing the electrocardiographic signal;

executing a set of instructions to analyze the electrocardiographic signal;

detecting the deviation from the normal heart electrical activity and upon detecting the deviation, transmitting the alarm and the electrocardiographic signal to at least one of a plurality of external receivers electromagnetically connected to a microdevice operatively connected to the implantable medical device;

activating a programmed annunciator circuit to deliver the alarm and establish with a remote transceiver a communication link providing a communication between a person alerted by the alarm and the remote transceiver;

transmitting the electrocardiographic signal to the remote transceiver;

automatically providing an automatic location identification signal; and

activating a telephone to automatically dial a programmed emergency telephone number.

25. The method of claim 24 wherein the telephone is activated by transmitting a radio frequency signal from the microdevice to the telephone to automatically dial the programmed emergency telephone number.

26. The method of claim 24 wherein the telephone is activated by forwarding a signal from the microdevice to the telephone using a modulated carrier on a household power line.

27. The method of claim 24 wherein an analysis of the electrocardiographic signal comprises operating an algorithm for detecting ventricular activation and measurement of an interval between successive ventricular activations.

28. The method of claim 24 wherein an analysis of the electrocardiographic signal comprises operating an algorithm for detecting deviation from a baseline of a segment of the electrocardiographic signal following a QRS complex.

29. The method of claim 24 wherein analysis of the electrocardiographic signal comprises operating an algorithm for detecting a ST segment deviation.

30. The method of claim 24 wherein the deviation comprises one of an acute myocardial ischemia, a ventricular tachycardia and a ventricular fibrillation.

31. The method of claim 24 further comprising the step of instructing the person alerted by the alarm.

32. The method of claim 24 wherein the transmission of the alarm is delayed to disengage the alarm in a false detection of the deviation from the normal heart electrical activity.