Adaptive PVAB Timing for Reliable Atrial Event Sensing
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Solution Overview
Problem
Existing cardiac pacemakers struggle to reliably sense atrial event signals due to interference from ventricular events, leading to suboptimal atrial-synchronized ventricular pacing.
Innovation Solution
A ventricular pacemaker with a motion sensor, such as an accelerometer, is used to detect atrial events by sensing cardiac motion signals, and adjusts a post-ventricular atrial blanking period (PVAB) based on heart rate and signal amplitude to enhance atrial event sensing and pacing synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed blanking period is used to prevent ventricular event interference, then ventricular event interference is reduced, but atrial event sensing reliability deteriorates when heart rate varies
Solution Approach 1:
The patent applies dynamics by making the blanking period adjustable rather than fixed. The control circuit dynamically modifies the blanking period duration based on detected heart rate changes and signal characteristics, allowing the system to adapt to varying cardiac conditions while maintaining reliable atrial event sensing across different heart rates
Solution Approach 2:
The patent implements parameter changes by modifying the blanking period duration as a variable parameter. The system changes this temporal parameter in response to detected cardiac conditions, such as varying heart rates or signal amplitudes, to optimize both interference rejection and sensing reliability under different operating conditions
2Reliability
If the blanking period is extended to improve atrial event detection, then atrial event detection reliability is improved, but ventricular event interference increases
Solution Approach 1:
The system dynamically adjusts the blanking period duration based on real-time cardiac conditions. When atrial event detection reliability needs improvement, the blanking period is extended; when ventricular interference becomes problematic, the blanking period is shortened, creating a dynamic balance between these competing requirements
Solution Approach 2:
The control circuit uses feedback from detected cardiac signals to continuously optimize the blanking period. By monitoring heart rate, signal amplitudes, and detection quality, the system adjusts the blanking period to achieve optimal atrial event detection while minimizing ventricular interference
3Measurement precision
If the pacemaker uses motion sensing to detect atrial events, then sensing capability is improved, but susceptibility to motion artifacts increases
Solution Approach 1:
The system changes sensing parameters dynamically by adjusting the blanking period and detection thresholds based on motion sensor data and cardiac rhythm analysis. This allows the system to maintain high sensing capability while compensating for motion artifacts through parameter adaptation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves the reliability of atrial event sensing and maintains optimal atrial-synchronized ventricular pacing by minimizing interference from ventricular events, ensuring proper cardiac rhythm management.
Implementation Method 1
The device may have a motion sensor configured to sense a cardiac motion signal
Data Source
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AI summary
A medical device is configured to identify a first group of cardiac events, determine a cardiac event interval based on the first group of cardiac events and determine whether the cardiac event interval is less than a threshold interval or greater than the threshold interval. The medical device is configured to select a first blanking period duration if the cardiac event interval is less than the threshold interval or a second blanking period duration if the cardiac event interval is greater than the threshold interval.