Optical Shape Sensing for Interventional Device Foreshortening
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Solution Overview
Problem
Existing systems struggle to accurately visualize and communicate three-dimensional (3D) information of interventional devices, particularly in cases of foreshortening, which can lead to errors in registration and deployment during minimally invasive procedures.
Innovation Solution
An optical shape sensing (OSS) foreshortening detection system that integrates an OSS sensor with interventional tools to detect and manage foreshortening by reconstructing the device's shape and providing real-time feedback to operators, recommending repositioning of imaging modalities if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If two-dimensional projections of the device shape are displayed to visualize 3D information, then the device operator can see the device position, but foreshortening occurs making the device length appear shorter than actual
Solution Approach 1:
The system continuously monitors the device shape using OSS sensors and provides real-time feedback to the operator through visual displays. The feedback loop includes detecting foreshortening conditions and alerting the operator, enabling corrective actions to maintain measurement accuracy throughout the procedure
Solution Approach 2:
The patent introduces an intermediate computational layer that processes raw OSS sensor data and reconstructs the true 3D device shape. This intermediary system calculates actual device length and position independent of foreshortening, then presents corrected information to the operator through multiple visualization methods
2Measurement precision
If the imaging modality is repositioned to address foreshortening, then the device length can be accurately visualized, but the procedure time increases
Solution Approach 1:
The system performs preliminary detection of foreshortening conditions using OSS sensors before they significantly impact the procedure. By continuously monitoring device shape and predicting potential foreshortening, the system alerts the operator in advance, allowing proactive adjustment rather than reactive repositioning
Solution Approach 2:
The system automatically detects and quantifies foreshortening without requiring manual intervention or repeated imaging. The OSS sensors continuously self-monitor device shape, and the computational algorithms automatically calculate corrections, reducing the need for operator time and repeated imaging procedures
3Measurement precision
If OSS sensors are integrated into interventional tools for live visual guiding, then device position can be tracked, but device buckling and whipping may occur reducing pushability and torquability
Solution Approach 1:
The OSS sensors are integrated within flexible optical fibers that can be embedded in the interventional tool without significantly affecting its mechanical properties. The thin optical fiber structure provides minimal structural interference while enabling continuous shape and position monitoring throughout the device length
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 accuracy of device registration and deployment by identifying and addressing foreshortening, thereby improving the effectiveness of minimally invasive procedures.
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
The principle involved makes use of distributed strain measurements in the optical fiber using characteristic Rayleigh backscatter or controlled grating patterns
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3~4B
AI summary
An OSS foreshortening detection system employing an interventional device (40) including a OSS sensor (20) having shape nodes for generating shape sensing data informative of a shape of OSS sensor (20). The system further employs a OSS foreshortening detection device (80) including a OSS shape controller (90) for reconstructing a shape of a portion/entirety of interventional device (40) derived from a generation of the shape sensing data by OSS sensor (20). Device (80) further includes a OSS foreshortening controller (100) for monitoring any foreshortening of the interventional device (40) within an image of the interventional device (40) including the OSS foreshortening controller (100) detecting a location of any occurrence of a foreshortening of the interventional device (40) within the image of interventional device (40) derived from the reconstruction of the shape of the portion/entirety of interventional device (40) by the OSS shape controller (90).