Cardiac Coordinate System for CRT Lead Placement
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Solution Overview
Problem
Despite advances in device technology, approximately one-third of patients fail to respond adequately to cardiac resynchronization therapy (CRT) due to inadequate lead placement strategies, highlighting the need for improved methods to optimize left ventricular pacing site selection.
Innovation Solution
The method involves acquiring cardiac information through a catheter in various positions within the venous network of the heart, performing principal component analysis to determine a cardiac coordinate system, and selecting components to represent axes for enhanced guidance of LV pacing site optimization during CRT implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional lead placement strategy targeting lateral or posterolateral branches of coronary venous system is used, then lead placement is simplified, but therapy response is inadequate in one-third of patients
Solution Approach 1:
The patent transforms the lead placement approach from anatomical targeting (fixed location-based) to functional targeting (delay-based). By measuring electrical delay and mechanical delay parameters at multiple sites and selecting the site with maximal delay, the method optimizes therapy response. This parameter-based selection changes the placement criterion from simple anatomical landmarks to quantified functional measurements, resolving the contradiction between placement simplicity and therapy effectiveness.
Solution Approach 2:
The patent replaces conventional anatomical navigation (mechanical/physical guidance through venous system) with electrical and mechanical signal-based guidance. By using intracardiac electrograms and tissue synchronization imaging to measure delays, the system substitutes physical anatomical targeting with signal processing and parameter analysis, enabling more precise and effective lead placement that improves therapy response while maintaining procedural feasibility.
2Ease of manufacture
If lead placement targets anatomical locations (lateral/posterolateral branches), then placement procedure is straightforward, but optimal functional outcome is not achieved
Solution Approach 1:
The patent performs preliminary measurements of electrical delay and mechanical delay at multiple potential lead sites before final lead implantation. By conducting these assessments during the procedure using catheter-based electrograms and imaging, the method allows optimization of placement location based on measured parameters. This preliminary assessment action enables functional optimization without complicating the overall implantation procedure, as the measurements guide the final placement decision.
Solution Approach 2:
The patent introduces measurement intermediaries (electrical delay measurements and mechanical delay measurements) between the anatomical location and the final placement decision. These intermediary parameters serve as mediators that translate anatomical positions into functional effectiveness metrics, allowing optimization of placement based on actual physiological impact rather than mere anatomical convenience. This intermediary measurement approach bridges the gap between simple placement and optimal functional outcome.
Data Source
AI summary
An exemplary method includes accessing cardiac information acquired via a catheter located at various positions in a venous network of a heart of a patient wherein the cardiac information comprises position information with respect to time for one or more electrodes of the catheter; performing a principal component analysis on at least some of the position information; and selecting at least one component of the principal component analysis to represent an axis of a cardiac coordinate system. Various other methods, devices, systems, etc., are also disclosed.