Stent Length Estimation Device Foreshortening Correction
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Solution Overview
Problem
Current technologies fail to accurately estimate the length of a stent implanted in a blood vessel, particularly considering the foreshortening phenomenon that occurs when the stent is released from a catheter, which is crucial for determining the implantation range of stents like flow diverter stents used in cerebral aneurysm treatment.
Innovation Solution
A stent length estimation device and program that specify the implantation start position, direction, and stent specifications such as diameter, length, and wire pitch on a three-dimensional blood vessel image, allowing for calculation of the implanted stent length along with the blood vessel diameter, and displaying the implantation range, including division of the vessel into fine sections for accurate length calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stent is released from the catheter into the blood vessel, then the stent can be implanted in the blood vessel, but the stent length is shortened due to foreshortening
Solution Approach 1:
The system performs preliminary calculation of the stent's implanted length by applying foreshortening correction before the actual implantation procedure. The estimated implanted length is computed using the nominal stent length, wire pitch, and blood vessel diameter parameters, allowing the operator to pre-determine the appropriate implantation range without experiencing foreshortening during the procedure.
2Device complexity
If the stent length is estimated without considering foreshortening, then the estimation is simple, but the implantation range determination becomes inaccurate
Solution Approach 1:
The system transforms the nominal stent parameters (wire pitch, number of wires) into corrected implanted parameters by introducing the foreshortening effect. The estimated implanted length is calculated by adjusting the nominal length according to the relationship between wire pitch, blood vessel diameter, and the foreshortening ratio, thereby achieving accurate implantation range determination while maintaining calculation simplicity.
3Ease of manufacture
If the stent is designed with fixed nominal length, then the manufacturing is simplified, but the actual implanted length varies due to foreshortening
Solution Approach 1:
The system provides feedback to the operator about the expected implanted length based on the nominal stent specifications and patient-specific blood vessel measurements. By calculating the foreshortening-corrected implanted length before the procedure, the system enables precise control of the implantation range while maintaining fixed nominal stent designs for manufacturing simplicity.
Data Source
AI summary
To estimate the length of a stent implanted in a blood vessel after implantation of the stent. A stent length estimation device 100 includes an implantation start position specifying means for receiving, from a user, a designation of an implantation start position of an aneurysm treatment stent which is formed by helicoidally braiding a plurality of metal wires and specifying the implantation start position of the stent on a three-dimensional blood vessel image which represents a three-dimensional shape of the blood vessel, an implantation direction specifying means for receiving a designation of an implantation direction of the stent from the user and specifying the implantation direction of the stent on the three-dimensional blood vessel image, a stent specification specifying means for specifying a diameter of the stent after expanded, a length of the stent after expanded, the number of wires of the stent, and a pitch length of the wires of the stent after expanded as a specification of the stent, and an implanted stent length calculating means for calculating a length of the stent which is implanted and expanded along with a blood vessel diameter on the basis of the specification of the stent specified by the stent specification specifying means and the blood vessel diameter of the blood vessel in the implantation direction specified by the implantation direction specifying means from the implantation start position specified by the implantation start position specifying means.