Left Atrial Appendage Pacing Timing to Maximize Blood Flow
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Solution Overview
Problem
Patients with atrial fibrillation often experience thrombus formation in the left atrial appendage due to stagnant blood, which can lead to stroke or heart attack, and existing medical devices are inadequate in addressing this issue.
Innovation Solution
A pacing system is designed with a first electrode positioned in a heart chamber and a second electrode positioned adjacent to the left atrial appendage, delivering synchronized pacing therapies to enhance blood flow into and out of the left atrial appendage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single chamber pacing therapy is delivered, then the device complexity is reduced, but the blood flow maximization in the left atrial appendage is insufficient leading to thrombus formation
Solution Approach 1:
The pacing system is segmented into two distinct pacing therapies: a first pacing therapy delivered to a first chamber (e.g., left atrium) and a second pacing therapy delivered to the left atrial appendage. This segmentation allows each pacing therapy to be optimized for its specific target, with the first pacing therapy addressing overall atrial function and the second pacing therapy specifically addressing blood flow stasis in the LAA, thereby preventing thrombus formation while maintaining manageable device complexity through modular lead and electrode configurations
2Productivity
If synchronized pacing therapies with optimized timing are delivered, then the blood flow into and out of the left atrial appendage is maximized, but the device complexity and timing control requirements increase
Solution Approach 1:
The system establishes a predetermined pacing delay between the first pacing therapy and the second pacing therapy before clinical operation. This preliminary timing configuration is optimized during device implantation or programming to coincide with the cardiac cycle phases that maximize blood flow into and out of the left atrial appendage. By pre-setting this timing relationship, the system achieves optimal blood flow efficiency without requiring complex real-time adjustment mechanisms during operation
Solution Approach 2:
The pacing system incorporates timing feedback mechanisms where the delivery of the second pacing therapy is precisely timed relative to the first pacing therapy based on detected cardiac events or predetermined intervals. This feedback-based timing control ensures that the pacing therapies are delivered at optimal moments in the cardiac cycle to maximize blood flow through the left atrial appendage, while the processing module automatically manages the timing coordination without requiring complex external control systems
Data Source
AI summary
A pacing system configured to sense cardiac activity and to deliver pacing therapy to a patient's heart. The pacing system may comprise a first electrode configured to be positioned in a first chamber of the heart and configured to deliver a first pacing therapy to the first chamber of the heart and a second electrode configured to be positioned in the left atrial appendage and configured to deliver a second pacing therapy to the left atrial appendage. The processing module of the pacing system may be configured to time a delivery of the first pacing therapy based on a first timing fiducial and a delivery of the second pacing therapy based on a determined pacing delay between the first pacing therapy and the second pacing therapy. The determined pacing delay may be configured to maximize a flow of blood into and/or out of the left atrial appendage.