Shape Sensing Multiple Over-the-Wire Devices
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Solution Overview
Problem
Current medical devices, such as catheters and deployment systems, require additional lumens for optical shape sensing, increasing cost and complexity, and existing shape sensing systems do not efficiently determine the positions of multiple over-the-wire devices without embedding shape-sensing fibers in all devices.
Innovation Solution
A system that uses a shape-sensed flexible wire to determine the positions of multiple over-the-wire devices by employing a universal catheter hub to induce a known shape or curvature in the guidewire, allowing virtual visualization of these devices without embedding shape-sensing fibers in all medical instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical shape sensing fibers are embedded in multiple over-the-wire devices, then positional accuracy of multiple devices is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
A single shape-sensing guidewire serves multiple functions by enabling position determination for multiple different over-the-wire devices (catheters, deployment systems, sheaths) simultaneously, eliminating the need for each device to have its own embedded shape-sensing fiber
Solution Approach 2:
The shape-sensing guidewire acts as an intermediary element that indirectly measures the positions of other devices by detecting its own shape changes caused by the geometric relationships with overlying devices, rather than directly sensing each device
2Measurement precision
If additional lumens are added to devices for optical shape sensing, then shape sensing capability is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The shape-sensing guidewire provides a universal sensing platform that works with multiple different medical devices, eliminating the need to manufacture each device with custom shape-sensing lumens and fibers
Solution Approach 2:
The shape-sensing capability is extracted from individual medical devices and consolidated into a separate, reusable guidewire that can be used with multiple devices, removing the need for custom manufacturing modifications to each device
3Loss of information
If multiple shape-sensing systems are used for multiple devices, then positional information completeness is improved, but system complexity increases
Solution Approach 1:
Multiple shape-sensing measurements from different device configurations are merged into a single integrated system using one shape-sensing guidewire, where a centralized processing system determines positions of all devices based on the guidewire's shape data and geometric relationships
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
Enables efficient navigation and positioning of multiple over-the-wire devices using a single shape-sensed guidewire, reducing the need for additional shape-sensing systems and simplifying the mechanical design of medical instruments, while maintaining accurate positional data for complex procedures like endovascular aneurysm repair.
Implementation Method 1
One principle involved makes use of distributed strain measurement in the optical fiber using characteristic Rayleigh backscatter
Implementation Method 2
distributed strain measurement in the optical fiber using characteristic Rayleigh backscatter or controlled grating patterns
Data Source
AI summary
A medical instrument includes a first device (108) including shape-sensed flexible instrument, a second device (102) disposed over the first device and a third device (109) disposed over the first device and a portion of the second device. The second and third devices include a geometric relationship such that a position of the second device and the third device is determined from shape sensing information of the first device and the geometric relationship.