Adjustable Vascular Stent Graft for Aortic Arch Migration Prevention
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Solution Overview
Problem
Conventional stents and stent grafts face challenges in accommodating irregular vascular anatomy, particularly at the aortic arch, where high blood flow and pressure require adjustable devices that can expand and contract to prevent migration and leakage, and current designs are cumbersome for deployment 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 and stiff portions to accommodate varying anatomies, along with the ability to be repositioned post-deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stents and stent grafts are used in the aortic arch, then they provide structural support, but they cannot accommodate irregular vascular anatomy and are prone to migration and leakage due to high blood flow and pressure
Solution Approach 1:
The stent graft incorporates adjustable dimensions and orientations that can be modified post-deployment to adapt to the irregular anatomy of the aortic arch. The device transitions from a fixed configuration to a dynamically adjustable one, allowing clinicians to optimize the fit after implantation to prevent migration and leakage while accommodating patient-specific vascular geometry.
Solution Approach 2:
The device allows for changes in physical parameters such as diameter, length, and orientation angles after deployment. These parameter adjustments enable the stent graft to conform to the irregular contours of the aortic arch and maintain secure anchoring under high blood flow conditions, directly addressing the reliability-adaptability contradiction.
2Adaptability or versatility
If adjustable devices are developed to accommodate irregular anatomy, then adaptability improves, but device complexity increases
Solution Approach 1:
The stent graft is divided into distinct segments with different mechanical properties - flexible portions for adapting to irregular anatomy and stiff portions for providing structural support and resistance to high blood flow. This segmentation allows the device to achieve adaptability without requiring complete redesign of the entire structure, thereby limiting the increase in overall complexity.
Solution Approach 2:
Different portions of the stent graft are assigned different local qualities - some areas are made flexible to conform to irregular vascular surfaces, while other areas maintain stiffness to prevent migration and withstand hemodynamic forces. This localized differentiation achieves adaptability where needed without compromising overall device simplicity.
3Ease of operation
If conventional deployment methods are used, then implantation is straightforward, but repositioning is difficult and time-consuming
Solution Approach 1:
The stent graft incorporates dynamic adjustment capabilities that allow for post-deployment repositioning without requiring complete removal. The adjustable orientation and dimension features enable clinicians to modify the device's position and configuration in situ, significantly reducing the time and complexity associated with repositioning compared to conventional fixed stents that would require surgical intervention for adjustment.
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 a secure and adaptable solution for treating vascular diseases by ensuring a proper fit and seal within the aortic arch, reducing the risk of migration and leakage, and facilitating easier deployment and repositioning.
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.