Implantable Pacing Device Fusion Beat Detection
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Solution Overview
Problem
Current cardiac resynchronization therapy (CRT) systems face challenges in effectively evaluating the percentage of CRT pacing pulses that capture the heart and determining optimal therapy control parameters, such as timing intervals, due to limitations in detecting atrial depolarizations and intrinsic conduction measurements, which can lead to suboptimal ventricular synchrony and hemodynamic efficiency.
Innovation Solution
The implementation of an intracardiac pacing device with a motion sensor, such as an accelerometer, to evaluate cardiac contractions and determine the effectiveness of CRT by identifying fusion beats and adjusting A-V and V-V intervals based on intrinsic conduction measurements, allowing for real-time adaptation of pacing configurations and timing intervals to enhance ventricular synchrony.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CRT systems use standard sensing methods to detect atrial depolarizations and intrinsic conduction, then the basic pacing function is maintained, but the measurement precision of cardiac contraction evaluation is insufficient leading to suboptimal ventricular synchrony
Solution Approach 1:
The patent replaces electrical sensing methods with mechanical sensing using an accelerometer to detect cardiac contractions. The accelerometer measures mechanical motion of the heart, providing more direct and accurate information about actual contraction events and ventricular synchrony compared to indirect electrical signals. This mechanical substitution enables precise evaluation of CRT effectiveness by directly measuring the mechanical response to pacing pulses.
2Adaptability or versatility
If CRT systems deliver fixed pacing pulses without real-time evaluation, then the device complexity is reduced, but the adaptability to patient-specific conduction characteristics is insufficient
Solution Approach 1:
The system performs self-evaluation by using the implanted accelerometer to automatically detect cardiac contractions and evaluate CRT effectiveness in real-time. The device monitors its own pacing performance by detecting mechanical contractions following pacing pulses, automatically determining capture status and fusion beats without requiring external monitoring equipment. This self-service capability enables adaptive pacing configuration adjustments while keeping the device relatively simple.
Solution Approach 2:
The patent implements a feedback loop where the accelerometer continuously monitors cardiac contractions, and the processing circuitry analyzes these signals to determine pacing effectiveness. Based on this real-time feedback about capture status and ventricular synchrony, the system can adaptively adjust pacing parameters such as A-V and V-V intervals to optimize CRT delivery for each patient's specific conduction characteristics.
3Measurement precision
If the system evaluates each cardiac cycle individually for fusion beats, then the measurement precision of CRT effectiveness is improved, but the loss of time for processing increases
Solution Approach 1:
The system performs preliminary evaluation by detecting cardiac contractions in real-time as they occur following each pacing pulse. The accelerometer continuously monitors mechanical motion, and the processing circuitry immediately analyzes each contraction to determine capture status and fusion characteristics. This preliminary, real-time evaluation eliminates delays associated with post-processing external recordings, enabling prompt adaptation of pacing parameters based on each individual cardiac cycle's response.
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
This approach enables more precise and adaptive delivery of CRT, improving ventricular synchrony and hemodynamic efficiency by accurately determining the effectiveness of pacing pulses and adjusting therapy parameters to achieve fusion beats, thereby enhancing cardiac output and patient-specific treatment efficacy.
Implementation Method 1
a motion sensor, such as an accelerometer, to evaluate cardiac contractions
Data Source
AI summary
In some examples, a system can be used for delivering cardiac resynchronization therapy (CRT). The system may include a pacing device configured to be implanted within a patient. The pacing device can include a plurality of electrodes, signal generation circuitry configured to deliver ventricular pacing via the plurality of electrodes, and a sensor configured to produce a signal that indicates mechanical activity of the heart. Processing circuitry can be configured to identify one or more features of a cardiac contraction within the signal, and determine whether the contraction was a fusion beat based on the one or more features.