Adjustable Vascular Stent Graft for Irregular Anatomy
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Solution Overview
Problem
Conventional stents and stent grafts face challenges in accommodating irregular vascular anatomy, particularly at the aortic arch, due to variability in vessel geometry and high blood flow pressures, which complicates precise placement and long-term sealing, and lack adjustability for patient-specific anatomy and repositioning.
Innovation Solution
The development of tubular devices with adjustable dimensions and orientations, made from elastic or superelastic materials, allowing for reduction or expansion of diameter and length, and featuring flexible or stiff sections to accommodate various anatomical shapes, along with the ability to reposition or remove the device post-deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional stents and stent grafts are used, then basic vascular support is provided, but they cannot accommodate irregular vascular anatomy and high blood flow pressures at the aortic arch
Solution Approach 1:
The stent graft incorporates adjustable sections that can be dynamically repositioned and resized after deployment. The adjustment mechanism allows the device to adapt to irregular vascular anatomy and maintain reliable sealing under high blood flow pressures by modifying the geometry of the stent graft body post-implantation.
Solution Approach 2:
The invention enables changes in physical parameters of the stent graft, including diameter, length, and orientation, after deployment. This allows the device to be customized in situ to match the specific anatomical parameters of the patient's aortic arch and other irregular vascular structures, improving both adaptability and sealing reliability.
2Adaptability or versatility
If conventional stents are used, then vascular support is provided, but they lack adjustability for patient-specific anatomy and repositioning capability
Solution Approach 1:
The stent graft is designed with dynamic adjustment capabilities that allow modification of its geometric parameters after deployment. The adjustment mechanism can be actuated through the delivery catheter or by external manipulation, enabling physicians to fine-tune the device fit for patient-specific anatomy without requiring complex custom manufacturing or multiple delivery systems.
3Reliability
If stent grafts are deployed to seal vascular defects, then blood flow sealing is achieved, but device migration and leakage risks remain
Solution Approach 1:
The adjustable stent graft allows post-deployment modification of its dimensional parameters to optimize both sealing effectiveness and positional stability. By adjusting the diameter and length after implantation, the device can be better fitted to the vascular anatomy, reducing gaps that cause leakage and improving anchoring that prevents migration.
4Manufacturing precision
If fixed-dimension stents are used, then manufacturing is simplified, but they cannot align precisely with variable vascular anatomy
Solution Approach 1:
The stent graft incorporates adjustable sections with mechanisms that allow changing of dimensional parameters after deployment. This dynamic capability enables precise alignment with variable vascular anatomy without requiring complex custom-manufactured devices for each patient, as the standard device can be adjusted in situ to match the specific anatomical variations.
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
These devices provide improved adaptability and securement within the vasculature, reducing the risk of migration and leakage, and enabling precise alignment with variable anatomy, facilitating easier deployment and adjustment to achieve optimal therapeutic outcomes.
Implementation Method 1
made from elastic or superelastic materials, allowing for reduction or expansion of diameter and length
Implementation Method 2
made from elastic or superelastic materials, allowing for reduction or expansion of diameter and length
Data Source
AI summary
The present invention is directed to vascular implants and methods for fabricating the same. The implantable devices include but are not limited to stents, grafts and stent grafts. In many embodiments, the devices include one or more side branch lumens interconnected with the main lumen.