OSS-Guided Interventional Tools for Folding and Twisting Detection
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Solution Overview
Problem
Existing optical shape sensing (OSS) guiding systems face issues with 'pushability' and 'torquability' of interventional tools due to potential buckling and whipping, which degrade the mapping between proximal and distal segments, affecting manipulation and safety during minimally invasive procedures.
Innovation Solution
Integration of an OSS sensor with interventional tools to detect and monitor folding and twisting through pushability and torquability metrics, using optical fiber strain measurements to provide real-time warnings and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distal segments of the guidewire and catheter are made sufficiently flexible to be navigated through tortuous vasculature, then the navigability through anatomical structures is improved, but the pushability and torquability are degraded
Solution Approach 1:
The guidewire and catheter are divided into multiple segments with different flexibility characteristics. The proximal segments maintain higher stiffness for reliable pushability and torquability, while distal segments are designed with sufficient flexibility to navigate tortuous vasculature. This segmentation allows each portion to perform its specialized function without compromising the other.
Solution Approach 2:
Different sections of the guidewire and catheter are assigned different mechanical properties. The proximal segments are engineered with higher rigidity to ensure reliable operator control and force transmission, while the distal segments are designed with lower rigidity to enable navigation through complex anatomical pathways. This local differentiation of mechanical properties resolves the contradiction between navigability and pushability/torquability.
2Reliability
If the guidewire and catheter are made straight and stiff to achieve 1-to-1 mapping between proximal and distal segments, then the pushability and torquability are improved, but the flexibility to navigate tortuous vasculature is degraded
Solution Approach 1:
The device is segmented into proximal and distal portions with differentiated mechanical properties. The proximal segment is designed to remain relatively straight and stiff to maintain 1-to-1 mapping and ensure reliable operator control, while the distal segment is designed to be flexible to adapt to tortuous vasculature. This segmentation allows the system to achieve both reliable force transmission and anatomical adaptability.
Solution Approach 2:
The mechanical properties are locally optimized for different sections of the device. The proximal portion maintains high stiffness to ensure accurate transmission of operator inputs to the distal tip, while the distal portion incorporates enhanced flexibility to navigate complex anatomical pathways. This local quality differentiation resolves the contradiction between maintaining 1-to-1 mapping and achieving navigability.
3Ease of operation
If the interventional tool is advanced or rotated within the vasculature, then the navigation and manipulation capability is improved, but folding and twisting may occur degrading pushability and torquability
Solution Approach 1:
The system incorporates sensors that continuously monitor the shape and position of the guidewire and catheter before folding or twisting can occur. By detecting early signs of deformation through optical shape sensing, the system can alert the operator or automatically adjust parameters to prevent folding and twisting, thereby maintaining pushability and torquability while enabling safe navigation and manipulation.
Solution Approach 2:
The system employs real-time feedback through optical shape sensing technology to monitor the configuration of the guidewire and catheter during advancement and rotation. This feedback loop allows the system to detect folding or twisting tendencies and provide alerts or corrective actions, enabling the operator to maintain reliable pushability and torquability while performing necessary navigation and manipulation tasks.
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
Enhances the safety and efficacy of minimally invasive procedures by detecting and preventing buckling and whipping of interventional tools, ensuring precise navigation and reducing stress on anatomical structures.
Implementation Method 1
The principle involved makes use of distributed strain measurements in the optical fiber using characteristic Rayleigh backscatter or controlled grating patterns
Implementation Method 2
distributed strain measurements in the optical fiber using characteristic Rayleigh backscatter
Data Source
AI summary
An OSS guiding and monitoring system employs an interventional device (40) including an integration of a OSS sensor (20) and one or more interventional tools (30), the OSS sensor (20) for generating shape sensing data informative of a shape of the OSS sensor (20) as the interventional device (40) is navigated within an anatomical region. The OSS guiding and monitoring system further employs an OSS guiding controller (90) for controlling a reconstruction of a shape of the interventional device (40) within the anatomical region responsive to a generation of the shape sensing data by the OSS sensor (20), and an OSS monitoring controller (100) for controlling a monitoring of a degree of folding and/or a degree of twisting of the interventional device (40) within the anatomical region.