US 12,465,267 B2
Medical device for sensing cardiac function
Thomas E Kaib, Irwin, PA (US); and Shane S Volpe, Saltsburg, PA (US)
Assigned to ZOLL MEDICAL CORPORATION, Chelmsford, MA (US)
Filed by ZOLL Medical Corporation, Chelmsford, MA (US)
Filed on May 31, 2024, as Appl. No. 18/680,278.
Application 18/680,278 is a continuation of application No. 18/056,043, filed on Nov. 16, 2022, granted, now 12,023,166.
Application 18/056,043 is a continuation of application No. 16/929,257, filed on Jul. 15, 2020, granted, now 11,529,086, issued on Dec. 20, 2022.
Application 16/929,257 is a continuation of application No. 16/445,400, filed on Jun. 19, 2019, granted, now 11,109,793, issued on Sep. 7, 2021.
Application 16/445,400 is a continuation of application No. 16/038,800, filed on Jul. 18, 2018, granted, now 10,368,768, issued on Aug. 6, 2019.
Application 16/038,800 is a continuation of application No. 15/081,170, filed on Mar. 25, 2016, granted, now 10,052,043, issued on Aug. 21, 2018.
Claims priority of provisional application 62/139,318, filed on Mar. 27, 2015.
Prior Publication US 2025/0000422 A1, Jan. 2, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/35 (2021.01); A61B 5/00 (2006.01); A61B 5/25 (2021.01); A61B 5/256 (2021.01); A61B 5/28 (2021.01); A61B 5/361 (2021.01); A61B 5/363 (2021.01); A61B 5/366 (2021.01)
CPC A61B 5/35 (2021.01) [A61B 5/25 (2021.01); A61B 5/256 (2021.01); A61B 5/28 (2021.01); A61B 5/361 (2021.01); A61B 5/363 (2021.01); A61B 5/366 (2021.01); A61B 5/6805 (2013.01); A61B 5/7221 (2013.01); A61B 5/7282 (2013.01); A61B 5/746 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wearable medical device for determining whether a patient is experiencing a cardiac event, comprising:
a plurality of electrocardiogram (ECG) electrodes configured to sense an ECG signal of the patient; and
a medical device controller in communication with the plurality of ECG electrodes, the medical device controller comprising
a memory configured to store a plurality of ECG templates, the plurality of ECG templates comprising a first ECG template corresponding to a first baseline ECG signal of the patient during a first baselining period and a second ECG template corresponding to a second baseline ECG signal of the patient during a second baselining period different than the first baselining period; and
a cardiac event detector configured to
filter the ECG signal of the patient with each respective ECG template of the plurality of ECG templates;
determine a quality score for each respective ECG template based on a degree to which the filtered ECG signal corresponds to the ECG signal of the patient, wherein determining the quality score for each respective ECG template comprises measuring a deviation of at least one of a zero phase crossing or a magnitude of the filtered ECG signal and the ECG signal of the patient;
select the respective ECG template having a highest quality score to use as a current ECG template; and
compare a current ECG signal of the patient with the current ECG template to determine whether the patient is experiencing the cardiac event.