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Publication Number
US-12465267-B2
Publication Date
2025-11-11
Expiration Date
Abstract
According to at least one aspect, a medical device is provided. The medical device includes at least one electrode to sense an electrocardiogram (ECG) signal of a patient and a controller coupled to the at least one electrode. The controller may be configured to generate a first ECG template based on a first ECG signal of the patient, generate a second ECG template based on a second ECG signal of the patient, and determine whether the patient is experiencing a cardiac event based on the ECG signal of the patient and an identified one of the first ECG template and the second ECG template.
Core Innovation
The invention relates to a wearable medical device configured to determine whether a patient is experiencing a cardiac event by sensing an ECG signal with a plurality of electrocardiogram (ECG) electrodes. The device stores a plurality of ECG templates that include a first ECG template corresponding to a first baseline ECG signal during a first baselining period and a second ECG template corresponding to a second baseline ECG signal during a second baselining period different than the first baselining period. The cardiac event detector filters the ECG signal of the patient with each respective ECG template of the plurality of ECG templates.
For each respective ECG template, the device determines a quality score based on a degree to which the filtered ECG signal corresponds to the ECG signal of the patient. In determining the quality score, the device measures 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. Based on the quality scores, the device selects the respective ECG template having a highest quality score to use as a current ECG template.
The device then compares a current ECG signal of the patient with the current ECG template to determine whether the patient is experiencing the cardiac event. The documented summary further indicates template updating or re-baselining based on baseline periods, template selection based on patient state/activity and template quality metrics, and analysis of matched-filter outputs including correlation/phase and magnitude timing to discriminate treatable ventricular tachycardia (VT) or ventricular fibrillation (VF) versus untreatable supraventricular tachycardia (SVT).
The invention is additionally described as optionally delivering therapy using therapy electrodes and providing user/caregiver interaction, and as transmitting and receiving ECG templates via an antenna to and from an external system. The device can use multiple electrode pairs, and quality monitoring and morphology analysis are indicated to support the determination of whether a cardiac event is occurring.
Claims Coverage
Two independent claim sets are identified: one for the wearable medical device and one for a non-transitory computer readable medium included in a wearable medical device. Both independent claims cover a template-based ECG cardiac event detector that uses multiple baseline ECG templates from different baselining periods, quality scores based on deviation measures including zero phase crossing and magnitude, selection of the highest-quality template, and comparison of a current ECG signal to determine whether a cardiac event is occurring.
Wearable medical device with baseline ECG template selection and cardiac event determination
A wearable medical device comprising a plurality of electrocardiogram (ECG) electrodes configured to sense an ECG signal of the patient; a medical device controller in communication with the plurality of ECG electrodes, including memory storing a plurality of ECG templates with a first ECG template corresponding to a first baseline ECG signal during a first baselining period and a second ECG template corresponding to a second baseline ECG signal during a second baselining period different than the first baselining period; and a cardiac event detector configured to filter the ECG signal with each respective ECG template, 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 by 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 as a current ECG template, and compare a current ECG signal with the current ECG template to determine whether the patient is experiencing the cardiac event.
Non-transitory computer readable medium for baseline ECG template quality scoring and cardiac event determination
A non-transitory computer readable medium included in a wearable medical device storing instructions executable by at least one processor to determine whether a patient wearing the wearable medical device is experiencing a cardiac event, comprising instructions to store a plurality of ECG templates including a first ECG template corresponding to a first baseline ECG signal during a first baselining period and a second ECG template corresponding to a second baseline ECG signal during a second baselining period different than the first baselining period; filter an ECG signal of the patient obtained from a plurality of ECG electrodes with each respective ECG template; 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 by 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 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.
The claim coverage centers on using multiple baseline ECG templates from different baselining periods, filtering an ECG signal with each template, scoring template quality using deviation of at least one of zero phase crossing or magnitude between the filtered ECG signal and the patient ECG signal, selecting the highest-quality template as the current ECG template, and comparing the current ECG signal to determine whether the patient is experiencing the cardiac event.
Stated Advantages
Selects the respective ECG template having a highest quality score to use as a current ECG template for cardiac event determination.
Determines template quality by measuring deviation of at least one of a zero phase crossing or a magnitude between the filtered ECG signal and the ECG signal of the patient.
Documented Applications
No documented applications found
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