Catheter Velocity Filtering for Heart Chamber Surface Mapping
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Solution Overview
Problem
During the collection of geometry points for modeling heart chamber geometry, catheters often acquire erroneous points due to slipping into adjacent chambers or structures and cardiac motion, requiring manual deletion to exclude interior points and ensure only surface points are used for surface construction, which is time-consuming and inefficient.
Innovation Solution
A system and method that utilize a probe with a contact-sensing processor to monitor velocity and generate signals indicative of contact changes, distinguishing surface points from interior points by analyzing velocity thresholds and filtering location data points to exclude points outside acceptable contact ranges, thereby automating the exclusion of invalid points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the catheter collects geometry points freely during movement, then the completeness of surface mapping is improved, but the number of erroneous interior points increases requiring manual deletion
Solution Approach 1:
The system performs preliminary filtering of geometry points by analyzing velocity thresholds and contact status before the surface construction algorithm processes them. This preliminary action separates valid surface points from invalid interior points, eliminating the need for manual deletion and improving productivity.
Solution Approach 2:
The catheter system automatically distinguishes between surface points and interior points using velocity analysis and contact sensing, without requiring operator intervention. The system self-corrects by filtering out erroneous points, making the process autonomous and time-efficient.
2Measurement precision
If the catheter maintains continuous contact with the tissue surface, then the accuracy of surface points is improved, but the complexity of monitoring contact status increases
Solution Approach 1:
The system replaces complex mechanical contact sensing mechanisms with a computational approach using velocity threshold analysis. By substituting mechanical monitoring with algorithmic filtering based on motion characteristics, the system achieves accurate surface point identification without adding significant device complexity.
Solution Approach 2:
The system changes the monitoring parameter from direct mechanical contact detection to velocity-based criteria. By analyzing velocity thresholds and motion patterns, the system infers contact status and distinguishes surface points from interior points, simplifying the monitoring mechanism while maintaining accuracy.
3Productivity
If the catheter moves quickly to cover more area, then the productivity of geometry collection is improved, but the velocity-based filtering may incorrectly exclude valid surface points
Solution Approach 1:
The system employs dynamic velocity thresholds that adapt to the expected motion characteristics of the catheter during normal surface mapping. By setting appropriate velocity ranges and using temporal patterns, the system maintains high productivity while ensuring reliable distinction between valid surface points and invalid interior points, preventing false exclusions.
Data Source
AI summary
A system for mapping a tissue surface includes a probe for mapping a tissue surface, a localization system to measure a location data point indicative of the probe's location, a memory in which to store the location data point, a servo mechanism to move the probe along at least a portion of the tissue surface, a controller to move the probe to a plurality of locations and to record in the memory a plurality of location data points, and a contact-sensing processor to analyze the plurality of location data points and to identify a subset thereof on the tissue surface. A modeling processor generates a model of the tissue surface using the subset of location data points. The contact-sensing processor utilizes probe velocity, or a rate of change in the distance moved by the probe, to determine contact between the probe and the tissue surface.