Catheter Depth Cues on 3D Cardiac Maps for Wall Positioning
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Solution Overview
Problem
3D electroanatomical maps of cardiac chambers presented on 2D displays lack depth perception, making it difficult for physicians to understand the location of a catheter's distal end assembly relative to chamber walls.
Innovation Solution
Implementing catheter depth perception tools that provide visual indications of the catheter's location relative to chamber walls using scales, color coding, and light and shadow effects, allowing real-time depth perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 3D EA map is presented on a 2D display using orthographic projection, then the map provides accurate rendering of the cardiac chamber and catheters, but the physician cannot perceive the depth location of the catheter's distal end assembly relative to chamber walls
Solution Approach 1:
The patent adds a depth dimension to the 2D display by superimposing depth information (depth values, depth scales, depth indicators) onto the orthographic projection. This allows the catheter's depth position relative to chamber walls to be visualized without changing the accurate rendering provided by orthographic projection, effectively adding a third dimension to the 2D display.
Solution Approach 2:
The patent introduces depth information as an intermediary element between the orthographic projection and the physician's perception. Depth scales, depth indicators, and color-coded depth representations serve as mediators that translate the abstract depth data into visual cues that the physician can interpret to understand catheter positioning.
2Shape
If orthographic projection is used to display the 3D EA map, then the map maintains accurate geometric rendering, but it provides no sense of depth
Solution Approach 1:
The patent segments the depth information into separate visual elements (depth scales, depth indicators, color-coded regions) that can be independently processed and interpreted. This segmentation allows the physician to focus on geometric accuracy from the orthographic projection while simultaneously interpreting depth cues from the segmented depth information layers.
Solution Approach 2:
The patent employs color changes or color-coded depth representations to indicate different depth positions of the catheter relative to chamber walls. By using color variations, the patent provides an intuitive visual cue that enhances depth perception without affecting the geometric accuracy of the orthographic projection.
Data Source
AI summary
A system includes a display and a processor configured to receive an electroanatomical 3D map of cardiac chamber to be displayed on the display as a view-dependent orthographic projection. The processor is further configured to (i) receive position information of catheter located within the cardiac chamber, from catheter positioning system, (ii) define a reference point location of the catheter displayed on the map, (iii) for any given viewing direction of the map, define the viewing direction as a ray superimposed on a vector from a virtual viewer to the reference point location, (iv) calculate a view-dependent cardiac chamber distance between a distal wall location along the ray and a proximal wall location along the ray, (v) calculate a location over the ray of the reference point location relative to the cardiac chamber view-dependent distance, based on the position information, and (vi) indicate the calculated reference point location distance to user.