US 11,850,438 B2
Wearable cardioverter defibrillator (WCD) system detecting QRS complexes in ECG signal by matched difference filter
Joseph L. Sullivan, Kirkland, WA (US)
Assigned to West Affum Holdings DAC, Dublin (IE)
Filed by West Affum Holdings DAC, Dublin (IE)
Filed on Aug. 3, 2021, as Appl. No. 17/392,611.
Application 17/392,611 is a continuation of application No. 15/724,317, filed on Oct. 4, 2017, granted, now 11,077,310.
Claims priority of provisional application 62/404,140, filed on Oct. 4, 2016.
Prior Publication US 2021/0361960 A1, Nov. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61N 1/00 (2006.01); A61N 1/39 (2006.01); A61B 5/366 (2021.01)
CPC A61N 1/3987 (2013.01) [A61B 5/366 (2021.01); A61N 1/3904 (2017.08); A61N 1/3925 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wearable cardioverter defibrillator (WCD), comprising:
a support structure configured to be worn by a patient;
an energy storage module configured to store an electrical charge;
a discharge circuit coupled to the energy storage module;
electrodes configured to obtain an electrocardiogram (ECG) signal of the patient while the patient is wearing the support structure, wherein the electrodes are dry electrodes; and
a processor configured to:
process the ECG signal to detect a QRS complex in the ECG signal using an adaptive matched filter, wherein the adaptive matched filter is configured to detect the QRS complex in the ECG signal having noise caused by friction between the patient and the dry electrodes;
assess similarity between two or more QRS complexes in the ECG signal, and to provide an organization value based on the assessed similarity;
compute a heart rate of the patient based at least in part on the detected QRS complex and the organization value;
determine based at least in part on the computed heart rate whether a shock criterion is met; and
responsive to the shock criterion being met, control the discharge circuit to discharge at least a portion of the stored electrical charge through the patient while the support structure is worn by the patient to deliver a shock to the patient.