Vessel Deformation Compensation in Stent Placement Imaging
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Solution Overview
Problem
Existing methods for displaying a vessel, such as an aorta, during stent insertion in abdominal aortic aneurysm treatment fail to accurately account for variability in patient anatomy and instrument rigidity, leading to deformation unpredictability and misalignment in fluoroscopic images.
Innovation Solution
A method that characterizes biological subjects and inserted objects using predefined parameters, measures deformation parameters through data collection and interpolation, and modifies reference images using these values to predict and correct for vessel deformation, enabling precise image overlay and stent placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deformation predictability is assumed for recurring conditions, then the reference image can be adapted using calculated deformation values, but the method fails to account for significant variations in patient anatomy and instrument properties
Solution Approach 1:
The patent applies parameter changes by introducing a comprehensive set of patient-specific parameters (age, sex, height, weight, body surface area, vessel diameter, vessel length, calcification degree) and instrument parameters (outer diameter, length, rigidity, tip angle). These parameters are used to select appropriate deformation values from pre-measured data, enabling accurate deformation compensation while adapting to individual variations in patient anatomy and instrument properties.
2Manufacturing precision
If rigid instruments are used for stent insertion, then stent placement precision can be improved, but vessel wall deformation increases making reference image alignment difficult
Solution Approach 1:
The patent applies preliminary action by pre-measuring deformation values for various instrument-vessel combinations before the actual stent insertion procedure. These pre-measured deformation values are stored and later used to compensate for the expected deformation caused by the rigid instrument, allowing the reference image to be adjusted in advance to match the deformed vessel shape during the procedure.
Solution Approach 2:
The patent implements feedback by using fluoroscopic images captured during the procedure to detect actual vessel deformation, comparing it with the pre-measured deformation values, and adjusting the reference image accordingly. This feedback loop ensures that the reference image remains aligned with the actual deformed vessel shape despite the use of rigid instruments.
Data Source
AI summary
A method for displaying a vessel of a particular biological subject is proposed. The particular object is inserted into the vessel. The deformation of the vessel is predicted by an inserted object on the basis of experience. This experience is quantified by assigning values to particular parameters, the parameters providing information concerning characteristics of the patient, characteristics of his/her vessel and information about the interventional instrument inserted.