Implantable Pacemaker AV Delay Optimization via Ventricular Acceleration
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Solution Overview
Problem
Current cardiac stimulation therapies face challenges in optimizing atrial-ventricular delay settings, which are often time-consuming and require skilled personnel, and may not account for changes in disease state or patient activity levels, leading to suboptimal atrial contribution to ventricular filling and reduced cardiac output.
Innovation Solution
An implantable multi-chamber cardiac pacemaker equipped with acceleration sensors to monitor ventricular filling phases, allowing for automated optimization of atrial-ventricular delay based on LV acceleration signal analysis, enabling separate identification of passive and active filling phases and adjustment of pacing intervals for enhanced cardiac function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If echocardiography is used to optimize AV delay settings, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The implantable medical device autonomously performs AV delay optimization by sensing ventricular filling phases and automatically adjusting pacing intervals without requiring external echocardiography equipment or skilled personnel intervention. The device serves itself by integrating sensing and control functions within the implanted system.
Solution Approach 2:
The patent replaces the mechanical echocardiography measurement system with an electrical sensing system that detects ventricular filling phases through electrograms. This substitution eliminates the need for external ultrasound equipment while achieving comparable optimization accuracy through electrical signal analysis.
2Measurement precision
If echocardiography is used to optimize AV delay settings, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The device performs continuous autonomous monitoring and adjustment of AV delay settings without requiring periodic clinic visits for echocardiography. The self-service capability allows real-time adaptation to changing patient conditions, eliminating time loss associated with repeated manual optimization procedures.
Solution Approach 2:
The system enables continuous optimization of AV delay settings rather than periodic adjustments. By continuously sensing ventricular filling phases and adjusting pacing intervals in real-time, the system maintains optimal cardiac function throughout the day, including during changes in activity level and disease state.
3Device complexity
If fixed AV delay settings are used, then device complexity is reduced, but adaptability worsens
Solution Approach 1:
The patent transitions from fixed AV delay settings to dynamic, automatically adjusted settings. The system continuously adapts pacing intervals based on real-time sensing of ventricular filling phases, allowing the device to respond to changing physiological conditions while maintaining manageable complexity through automated control algorithms.
Solution Approach 2:
The system implements closed-loop feedback by sensing ventricular filling phases and using this information to automatically adjust AV delay settings. This feedback mechanism enables the device to adapt to disease state changes and patient activity levels without requiring complex manual reprogramming or external intervention.
4Measurement precision
If manual optimization by skilled personnel is used, then measurement precision is improved, but ease of operation worsens
Solution Approach 1:
The implantable device autonomously performs the optimization function that previously required skilled personnel. By integrating sensing, analysis, and control capabilities within the implanted system, the device eliminates the need for external expertise while maintaining optimization accuracy through automated algorithms.
Solution Approach 2:
The patent replaces the human expert system with an automated electronic system that senses ventricular filling phases and adjusts pacing parameters. This substitution maintains measurement precision through objective electrical signal analysis while dramatically improving ease of operation by eliminating manual programming requirements.
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 enables real-time optimization of atrial-ventricular delay, improving atrial contribution to ventricular filling, maximizing cardiac output, and adapting to changes in patient conditions, thereby enhancing the effectiveness of cardiac stimulation therapies.
Implementation Method 1
an acceleration sensor deployed in operative relation to the left ventricle for sensing a left ventricular acceleration signal
Data Source
AI summary
A method for use in an implantable medical device, comprising: sensing a signal corresponding to ventricular wall acceleration; and determining a metric of atrial function using the ventricular wall acceleration signal. The method includes sensing the ventricular wall acceleration signal during at least during a sensing window corresponding to a ventricular filling phase.