His Bundle Pacing Signal Classification with Timed Blanking
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Solution Overview
Problem
Implantable medical devices for heart stimulation, such as pacemakers, face challenges in distinguishing between ventricular and atrial activity signals, leading to potential incorrect inhibition of His bundle pacing, which can result in severe medical conditions.
Innovation Solution
An implantable medical device with a processor, memory unit, stimulation unit, and detection units that employ a blanking period and adjustable sensing thresholds to differentiate between atrial and ventricular activity signals, ensuring accurate classification and reducing the risk of incorrect inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detection unit is used at the His bundle, then the device structure is simplified, but the ability to distinguish between atrial and ventricular signals deteriorates
Solution Approach 1:
The patent divides the detection function into two separate detection units: one positioned at the atrium and another at the His bundle. This segmentation allows each unit to specialize in detecting specific cardiac signals, with the atrial detection unit capturing atrial activity and the His bundle detection unit capturing ventricular activity, thereby resolving the signal distinction problem while maintaining reasonable device complexity through functional specialization.
2Measurement precision
If the detection sensitivity is increased to capture weak His bundle signals, then the detection precision is improved, but the risk of misinterpreting atrial signals as ventricular signals increases
Solution Approach 1:
The patent introduces a blanking period as an intermediary temporal mechanism that prevents the His bundle detection unit from responding to atrial signals during the atrial depolarization phase. This blanking window acts as a protective filter, allowing the detection sensitivity to remain high for genuine His bundle signals while temporarily suppressing detection during periods when atrial signals are present, thus preventing misinterpretation and improving classification reliability.
3Reliability
If the blanking period is extended to prevent atrial signal misinterpretation, then the signal classification reliability is improved, but the detection of early ventricular signals is delayed
Solution Approach 1:
The patent optimizes the blanking period duration as a critical parameter, setting it to a specific value range (20-80 ms) that balances two competing requirements: it is long enough to cover the atrial depolarization period and prevent atrial signal misinterpretation, yet short enough to allow early ventricular signals to be detected promptly. This parameter optimization resolves the contradiction by finding the precise temporal window that satisfies both reliability and timeliness requirements.
Data Source
AI summary
An implantable medical device for stimulating a human or animal heart. In operation, the device performs the following steps: a) sensing an atrial electric signal a the first detection unit; b) sensing an electric signal at the His bundle with a second detection unit upon termination of a first time period starting upon sensing the atrial electric signal with the first detection unit and/or starting upon applying a stimulation pulse, wherein the first time period lies in a range of from 10 ms to 100 ms; c) classifying the electric signal sensed with the second detection unit as His bundle activity signal or as ventricular activity signal.