Dynamic Heart Chamber Mapping via Phase-Segregated Shells
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Solution Overview
Problem
Conventional catheter navigation and mapping systems use a single static shell to represent the heart's geometry and volume, which does not accurately depict the changing volume of the heart chamber throughout the cardiac cycle, limiting the accuracy of anatomic markers and target isolation during procedures.
Innovation Solution
A system and method that collect sensor locations with cardiac phase indication to construct multiple shells, each representing the heart's geometry and volume at different phases of the cardiac cycle, allowing for a more accurate and dynamic rendering of the heart chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single static shell is constructed using only the outermost points, then the shell represents the maximum heart volume and ensures points coincide with the endocardial wall, but it does not accurately depict the changing volume of the heart chamber throughout the cardiac cycle
Solution Approach 1:
The patent segments the single static shell into multiple dynamic shells, each representing a different phase of the cardiac cycle. By dividing the heart chamber volume representation into discrete phase-specific shells (e.g., filling phase, ejection phase), the system captures the dynamic changes in heart geometry while maintaining the accuracy of endocardial wall representation for each phase.
Solution Approach 2:
The patent transforms the static shell model into a dynamic multi-shell model that adapts to different cardiac phases. Each shell is constructed with phase-specific parameters (such as end-diastolic volume, end-systolic volume) that reflect the actual geometry at that phase, enabling the system to accurately represent the changing volume and shape of the heart chamber throughout the cardiac cycle.
2Ease of manufacture
If sensor locations are collected without regard to cardiac phase, then data collection is simplified, but the resulting shell does not provide accurate phase-specific anatomical information
Solution Approach 1:
The patent applies preliminary action by first determining the cardiac phase for each sensor location before constructing the shells. The system pre-processes the sensor data by associating each point with its corresponding cardiac phase (filling, ejection, etc.), which enables subsequent phase-specific shell construction. This preliminary phase assignment ensures that anatomical markers and measurements are accurately attributed to the correct cardiac phase without complicating the overall data collection process.
3Measurement precision
If multiple phase-specific shells are constructed, then a more realistic representation of changing heart volume is achieved, but the system complexity increases
Solution Approach 1:
The patent applies universality by creating a multi-functional shell construction system that can generate different types of shells (phase-specific, volume-specific, morphology-specific) from the same sensor location data. The system uses universal algorithms and data structures that accommodate various shell types, reducing the overall complexity despite the increased functionality. The same framework handles both single-shell and multi-shell constructions, as well as different cardiac phase representations.
Data Source
AI summary
A system for constructing multiple shells (electronic models) indicative of the geometry and/or volume of a bodily lumen, such as a heart chamber, is configured to collect a plurality of location data points as the electrode is swept within the chamber. Each of the collected data points has an associated measured cardiac phase at which such point was acquired. The system is configured to segregate the collected electrode locations into sets based on the phase. Each set is characterized by a particular, associated phase of its constituent electrode locations. The system is configured to generate, for each set, a respective shell that will represent the chamber at the associated phase. The shells, once constructed, may be used for or in connection with a variety of diagnostic, mapping, and/or therapeutic procedures. The system is also configured to verify that the electrode is in contact with the heart tissue before using the collected data point in the shell construction (e.g., using a phase angle parameter to verify contact).