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WEARABLE CARDIOVERTER DEFIBRILLATORS (WCDS) SENSING ECG & IMPEDANCE ALSO FROM DEFIBRILLATION ELECTRODES

IP.com Disclosure Number: IPCOM000250024D
Publication Date: 2017-May-18

Publishing Venue

The IP.com Prior Art Database

Related People

Joseph L. Sullivan: AUTHOR

Abstract

Wearable cardioverter defibrillators (WCDs) have ECG electrodes and defibrillation electrodes. Patient physiological signals, such as ECG and impedance, are obtained from both types of electrodes, as different pairs; or even combine signals from an ECG electrode and an impedance electrode. Then the system can choose which pair(s) to use signals from.

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PUBLICATION ABOUT

WEARABLE CARDIOVERTER DEFIBRILLATORS (WCDS) SENSING ECG & IMPEDANCE ALSO FROM DEFIBRILLATION ELECTRODES

Author & Inventor:

Name: Residence: Joseph L. Sullivan Kirkland, WA

ABSTRACT

Wearable cardioverter defibrillators (WCDs) have ECG electrodes and

defibrillation electrodes. Patient physiological signals, such as ECG and impedance, are

obtained from both types of electrodes, as different pairs; or even combine signals from

an ECG electrode and an impedance electrode. Then the system can choose which

pair(s) to use signals from.

Attorney Docket Number: PCBL3367.2

PUBLICATION ATTORNEY DOCKET NO. PCBL3367.2 1

WEARABLE CARDIOVERTER DEFIBRILLATORS (WCDS) SENSING ECG ALSO FROM DEFIBRILLATION ELECTRODES

BACKGROUND

[01] When people suffer from some types of heart arrhythmias, the result may be

that blood flow to various parts of the body is reduced. Some arrhythmias may even

result in a Sudden Cardiac Arrest (SCA). SCA can lead to death very quickly, e.g. within

10 minutes, unless treated in the interim.

[02] Some people have an increased risk of SCA. People at a higher risk include

patients who have had a heart attack, or a prior SCA episode. A frequent

recommendation is for these people to receive an Implantable Cardioverter Defibrillator

(ICD). The ICD is surgically implanted in the chest, and continuously monitors the

patient’s electrocardiogram (ECG). If certain types of heart arrhythmias are detected,

then the ICD delivers an electric shock through the heart.

[03] After being identified as having an increased risk of an SCA, and before receiving

an ICD, these people are sometimes given a Wearable Cardioverter Defibrillator (WCD)

system. (Early versions of such systems were called wearable cardiac defibrillator

systems.) A WCD system typically includes a harness, vest, or other garment that the

patient is to wear. The WCD system further includes electronic components, such as a

defibrillator and electrodes, coupled to the harness, vest, or other garment. When the

patient wears the WCD system, the external electrodes may then make good electrical

contact with the patient’s skin, and therefore can help determine the patient’s ECG. If a

shockable heart arrhythmia is detected, then the defibrillator delivers the appropriate

electric shock through the patient’s body, and thus through the heart.

PUBLICATION ATTORNEY DOCKET NO. PCBL3367.2 2

DETAILED DESCRIPTION

[04] As has been mentioned, the present description is about WCD systems, software

and methods. Embodiments are now described in more detail. A wearable cardioverter

defibrillator (WCD) system made according to embodiments has a number of

components. These components can be provided separately as modules that can be

interconnected, or can be combined with other components, etc.

[05] A component of a WCD system can be a support structure, which is configured

to be worn by the patient. The support structure can be any structure suitable for

wearing, such as a harness, a vest, a h...