Multi-Electrode Catheter With Bi-Stable Basket for Stable Mapping
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Solution Overview
Problem
Existing multi-electrode catheters face challenges with signal stability and mapping accuracy due to uncertain deformation and shape control of post-shaped baskets, leading to high stress and intertwined wires, which affect contact with the heart surface.
Innovation Solution
A multi-electrode catheter with a flexible basket that supports electrodes, featuring a bi-stable structure stable in both contracted and deployed configurations, utilizing flexible electrode support members and bistable members to maintain precise shape and signal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a post-shaped basket is used to accommodate many wires, then the quantity of electrodes can be increased, but the shape control and signal stability deteriorate due to large nonlinear wire bending requiring rigorously controlled external forces
Solution Approach 1:
The basket is divided into multiple independent flexible electrode support members (splines) that can be individually controlled. Each spline acts as an independent segment that can be actuated to control the shape of its corresponding section of the basket, allowing precise local shape control while accommodating many electrodes throughout the entire structure.
Solution Approach 2:
The basket transitions from a static pre-shaped structure to a dynamic post-shaped structure that can be actively controlled during deployment. Shape control elements are introduced that allow the basket to dynamically adjust its configuration, maintaining stability in the deployed state without requiring constant external forces, thereby improving signal stability while supporting numerous electrodes.
2Manufacturing precision
If a pre-shaped basket is used, then the deployed shape can be precisely defined, but the number of wires is limited and stress concentration occurs in the contracted configuration
Solution Approach 1:
The invention transitions from a static pre-shaped basket to a dynamic post-shaped basket that achieves its final configuration through controlled deployment. This allows the basket to start with fewer wires in a compact state and then expand to accommodate many more electrodes in the deployed configuration, eliminating stress concentration while maintaining shape precision through active control.
Solution Approach 2:
The flexible electrode support members are arranged to nest within each other in the contracted configuration, allowing the basket to be compact during insertion. Upon deployment, these nested members expand outward to form the full basket structure with numerous electrodes, effectively increasing the wire capacity without compromising the precision of the final deployed shape.
3Quantity of substance
If large nonlinear wire bending is used to deploy a post-shaped basket, then many wires can be accommodated, but the expanded shape cannot be precisely estimated or accurately controlled onsite
Solution Approach 1:
The invention introduces active shape control elements that allow the basket to transition from a passive structure subjected to large nonlinear bending to an actively controlled structure. These control elements enable precise adjustment of the basket's configuration during deployment, allowing the final shape to be accurately controlled and positioned onsite rather than relying on pre-calculated deformation paths.
Solution Approach 2:
The invention changes the control parameters from fixed pre-deformed geometry to actively adjustable parameters during deployment. By introducing control mechanisms that can adjust wire tension, bending angles, and segment positions in real-time, the system can precisely control the final shape while accommodating many wires, overcoming the limitations of passive nonlinear deformation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The bi-stable structure ensures consistent electrode contact and accurate mapping by maintaining a stable deployed shape without additional external forces, enhancing signal stability and mapping accuracy.
Implementation Method 1
the basket is flexible between a deployed configuration and a contracted configuration, wherein the probe comprises a bi-stable structure which is stable in both the deployed configuration and the contracted configuration
Implementation Method 2
the probe comprises a bi-stable structure which is stable in both the deployed configuration and the contracted configuration
Data Source
AI summary
A multi-electrode surgical probe comprising a basket 10, and a plurality of electrodes supported on the basket, wherein the basket is flexible between a contracted configuration and a deployed configuration, and the probe comprises a bi-stable structure 12 which is stable in both the deployed configuration and the contracted configuration.