Implantable Device Beat Discriminator for Arrhythmia Synchronization
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Solution Overview
Problem
Implantable medical devices face challenges in synchronizing the delivery of electrical shocks for cardiac arrhythmia treatment due to oversensing, which can lead to unnecessary and unsynchronized shocks, caused by lead-related conditions such as fractures and insulation degradation, resulting in misidentification of cardiac beats.
Innovation Solution
The implementation of a method and system that includes a processor and sensing module to detect cardiac arrhythmias, analyze beats, and apply a beat discriminator to accurately identify true cardiac events, ensuring synchronized shock delivery with the patient's heart rhythm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead-related conditions (fractures, insulation degradation) are present, then the device can still deliver electrical stimulation, but oversensing occurs leading to misidentification of cardiac beats and incorrect shock synchronization
Solution Approach 1:
The patent implements a feedback mechanism where the detected signal is continuously monitored and analyzed. When oversensing is detected (false beat detection due to lead conditions), the system adjusts its response by comparing detected beats against expected physiological patterns and correcting shock synchronization timing accordingly, preventing unnecessary shocks while maintaining treatment efficacy
Solution Approach 2:
The patent introduces an intermediary analysis layer between the raw sensed signal and the shock delivery decision. This intermediary process evaluates signal characteristics, identifies oversensing events, and mediates the timing of shock delivery to ensure synchronization with true cardiac beats rather than noise artifacts
2Productivity
If lead fractures or connection disruptions occur, then the lead can still conduct electrical signals, but noise is introduced causing oversensing and unnecessary shock delivery
Solution Approach 1:
The patent converts the harmful effect of lead-related noise into a diagnostic opportunity. By analyzing the characteristics of detected signals, the system identifies patterns consistent with lead degradation and adjusts its operation accordingly, using the noise presence itself to trigger compensatory measures that prevent unnecessary shocks while maintaining effective arrhythmia treatment
3Speed
If the device delivers shocks based on oversensed beats, then rapid response to detected arrhythmias is achieved, but unnecessary shocks are delivered reducing treatment safety
Solution Approach 1:
The patent performs preliminary analysis of detected beats before triggering shock delivery. By pre-evaluating signal characteristics and comparing against physiological norms, the system identifies oversensing events in advance and prevents unnecessary shock delivery, maintaining rapid response capability while ensuring safety through preliminary verification
Data Source
AI summary
Systems and methods are described for analyzing a plurality of beats after detection of a suspected cardiac arrhythmia to determine a beat discriminator, identify a beat subsequent to completion of charging of an implantable medical device by applying the beat discriminator, and synchronize delivery of a shock from the medical device to the identified beat. In some examples, identifying the beat using the beat discriminator may help to accurately synchronize the shock with a beat representative of physiological cardiac events instead of an oversensed beat, e.g., noise sensed signal that is misclassified as a cardiac beat.