Basket Catheter Deformation Modeling for Real-Time Heart Chamber Visualization
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Solution Overview
Problem
During surgical procedures involving catheter insertion into a patient's heart chamber, the graphical representation of a basket assembly, which changes from an unconstrained to a constrained form due to contact with the chamber walls, fails to accurately depict these changes, hindering the physician's understanding of the catheter's position and orientation.
Innovation Solution
A system that includes a force sensor to measure the axial and equatorial components of the force exerted on the basket assembly, allowing a processor to calculate and render a real-time graphical image of the constrained form on a display, incorporating deformation and orientation changes based on predefined constants of proportionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple icon representing the basket assembly is used on the display, then the device complexity is reduced and ease of operation is improved, but the accuracy of depicting the catheter's position and orientation deteriorates
Solution Approach 1:
The display system dynamically transitions between a simplified icon view and a detailed 3D model view based on procedural context. The system monitors catheter contact forces and automatically switches to showing the constrained 3D model when contact is detected, providing detailed positional information only when needed, thus maintaining ease of operation while improving accuracy when required.
Solution Approach 2:
The system applies different levels of detail to different parts of the display interface. The overall interface remains simple with basic icons, but when catheter contact is detected, a detailed 3D model with precise spatial information is locally activated to show the specific constrained form and orientation, providing high measurement precision only in the relevant local context.
2Measurement precision
If a detailed 3D model showing constrained form is continuously displayed, then the accuracy of depicting the catheter's position and orientation is improved, but the device complexity increases
Solution Approach 1:
The system dynamically activates the detailed 3D model display only when catheter contact forces are detected, rather than continuously displaying it. This on-demand activation reduces the overall system complexity while maintaining high accuracy when needed, as the complex processing and display resources are engaged only during relevant procedural moments.
Solution Approach 2:
The complex 3D modeling and force analysis capabilities are activated locally and temporarily only when and where needed (upon detecting contact forces), rather than being continuously active throughout the entire procedure. This reduces overall device complexity while preserving measurement precision in the specific context where it provides value.
3Measurement precision
If force sensing and real-time rendering are implemented, then the accuracy of depicting the catheter's constrained form is improved, but the productivity decreases due to increased processing requirements
Solution Approach 1:
The system performs force sensing and 3D rendering operations periodically or event-driven rather than continuously. Force measurements are taken at specific intervals or triggered by contact events, and 3D models are regenerated only when contact conditions change, reducing overall processing requirements while maintaining accurate real-time representation during critical moments.
Solution Approach 2:
The processing intensity dynamically adjusts based on procedural needs. During periods of catheter movement without contact, processing is minimized to simple tracking. When contact forces are detected, the system dynamically increases processing power to perform detailed force analysis and 3D rendering, optimizing the balance between measurement precision and productivity across different procedural phases.
Data Source
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AI summary
Apparatus for medical treatment, consisting of a probe and a processor. The probe has an insertion tube having a distal end configured for insertion into a body cavity of a living subject, and a basket assembly having multiple resilient spines coupled to the distal end of the insertion tube and joined together in a predefined form when the basket assembly is unconstrained by external forces. The probe also has a force sensor configured to output an indication of a force exerted on the basket assembly within the body cavity. The processor is configured to receive the indication of the force, to compute a constrained form of the basket assembly, different from the predefined form, responsively to the force, and to render to a display a graphical image representing the constrained form of the basket assembly.