Defibrillator and method using limb leads for artifact free ECG

Patent metadata

Field	Value
Publication number	US-9604069-B2
Application number	US-201414774969-A
Country	US
Kind code	B2
Filing date	Mar 11, 2014
Priority date	Mar 12, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A defibrillator and method that uses ECG signals from limb lead electrodes for display and monitoring, even when a separate set of therapy pads are present at the patient. The limb lead ECG signal is used for display and to determine whether electrotherapy is necessary. The determination is a prerequisite to arming and delivery of the electrotherapy.

First claim

What is claimed is:

1. A method for selectively displaying an ECG on a defibrillator during a cardiac resuscitation of a subject, comprising the steps of:
providing a defibrillator having a display, a therapy pads connector, a monitoring electrodes connector separate from the therapy pads connector, a processor operable to obtain an electrocardiogram (ECG) responsive to inputs from both of (i) the therapy pads connector and (ii) the monitoring electrodes connector, and a controller operable to sense both (a) a connection of therapy pads to the therapy pads connector and (b) a connection of monitoring electrodes to the monitoring electrodes connector;
displaying, initially, an ECG obtained from a source that comprises the therapy pads connector;
and
automatically switching the source of the displaying of the ECG obtained from the therapy electrodes connector to a source of displaying of an ECG obtained from the monitoring electrodes connector responsive to sensing both (i) a connection of a set of therapy pads to the therapy pads connector and (ii) a connection of a set of monitoring electrodes to the monitoring electrodes connector.

2. The method of claim 1 , further comprising a filtering step of filtering the ECG from the monitoring electrodes prior to the displaying step.

3. The method of claim 1 , further comprising a step of toggling a source of the displaying back to the ECG obtained from the therapy electrodes connector subsequent to the automatically switching step.

4. The method of claim 3 , wherein the toggling step is automatic based on a sensed noise-free ECG obtained from the therapy electrodes connector.

5. The method of claim 4 further comprising:
analyzing the ECG obtained from the therapy electrodes connector; and
automatically switching the analyzing of the ECG obtained from the therapy electrodes connector to an analyzing of the ECG obtained from the monitoring electrodes connector responsive to the sensing step.

6. The method of claim 5 , further comprising a filtering step of filtering the ECG from the monitoring electrodes prior to the analyzing step.

7. The method of claim 5 , further comprising a step of toggling the analyzing back to the ECG obtained from the therapy electrodes connector subsequent to the automatically switching step, wherein the toggling step is automatic based on a sensed noise-free ECG obtained from the therapy electrodes connector.

8. A defibrillator comprising:
a therapy pads connector operable to connect to a set of therapy pads;
a monitoring electrode connector separate from the therapy pads connector and operable to connect to a set of monitoring electrodes;
a processor operable to obtain an ECG from both of (i) the therapy pads and (ii) the monitoring electrodes;
a sensor operable to sense both (i) the connection of the set of therapy pads to the therapy pads connector and (ii) the connection of the set of monitoring electrodes to the monitoring electrode connector, and further operable to automatically select the ECG obtained from the monitoring electrodes, instead of the ECG obtained from the therapy pads, for display in response to the sensed connection of both (i) the connection of the set of therapy pads to the therapy pads connector and (ii) the connection of the set of monitoring electrodes to the monitoring electrode connector; and
a display operable to display the selected ECG.

9. The defibrillator of claim 8 , wherein the processor is operable to filter the obtained ECG for removing noise artifact.

10. The defibrillator of claim 8 , wherein the sensor comprises a controller.

11. The defibrillator of claim 10 , wherein the sensor is further operable to automatically select the ECG obtained from the therapy pads in an absence of a sensed connection of the set of monitoring electrodes to the monitoring electrode connector.

12. The defibrillator of claim 8 , wherein the monitoring electrodes are operable to be disposed on a patient in a standard limb lead orientation.

13. The defibrillator of claim 8 , further comprising:
an artifact detector operable to determine the level of noise artifact on the ECG obtained from the therapy pads,
wherein the sensor is further operable to toggle a source of the ECG for display from the ECG obtained from the monitoring electrodes to the ECG obtained from the therapy pads if the level of noise artifact is below a predetermined noise level.

14. The defibrillator of claim 8 , further comprising:
a high voltage shock delivery circuit;
wherein the processor is further operable to analyze the ECG obtained from either of the therapy pads or the monitoring electrodes, and to determine a shock decision based on the obtained ECG;
wherein the sensor is further to automatically select a shock decision based on the ECG obtained from the monitoring electrodes in response to the sensed connection; and
wherein the high voltage shock delivery circuit is operable to deliver an electrotherapy shock via the therapy pads connector and therapy pads in response to the shock decision based on the ECG obtained from the monitoring electrodes.

15. The defibrillator of claim 14 ,
wherein the sensor is further operable to automatically select a shock decision based on the ECG obtained from the therapy pads in the absence of a sensed connection of the set of monitoring electrodes to the monitoring electrode connector; and
wherein the high voltage shock delivery circuit is further operable to deliver the electrotherapy shock via the therapy pads connector and the therapy pads in response to the shock decision based on the ECG obtained from the therapy pads.

Assignees

• Koninklijke Philips Nv

Inventors

• Helfenbein Eric
• Babaeizadeh Saeed
• Zhou Sophia Huai

Classifications

• A61N1/39044 Primary

  in combination with cardiopulmonary resuscitation [CPR] therapy · CPC title

• A61B5/7207

  of noise induced by motion artifacts · CPC title

• A61N1/046

  Specially adapted for shock therapy, e.g. defibrillation · CPC title

• A61N1/3993

  User interfaces for automatic external defibrillators · CPC title

• A61B5/04085

  Human Necessities · mapped topic