Branch Vascular Stent Anchoring Structure Against Post-Implant Shift
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Solution Overview
Problem
Existing vascular stents face issues with shifting or dislodging after implantation due to insufficient anchoring, particularly in the fenestration site of a main stent tube, leading to potential thrombus formation and blood flow obstruction in branch vessels.
Innovation Solution
A vascular stent design featuring proximal and distal supports on the outer wall of an inner stent tube, which expand to anchor securely to the main stent tube upon deployment, preventing shifting and dislodging through a combination of shape memory materials and angled supports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large stent is implanted into a blood vessel to treat aortic dissection or aneurysm, then the treatment effectiveness is improved, but the anchoring area at the proximal end becomes insufficient causing the stent to shift or dislodge
Solution Approach 1:
The invention extends the anchoring structure from a simple proximal flange to a three-dimensional configuration with both proximal and distal supports that extend in opposite directions along the aortic arch, utilizing the spatial dimension to create sufficient anchoring area for large stents
Solution Approach 2:
The anchoring structure is divided into separate proximal and distal support components rather than a single continuous flange, allowing independent optimization of each support's positioning and anchoring function at different locations along the aorta
2Reliability
If a branch stent tube is implanted into the fenestration site to ensure branch vessel blood supply, then the branch vessel patency is improved, but the branch stent tube easily shifts or becomes dislodged due to aortic arch pulsation
Solution Approach 1:
The branch stent tube is equipped with supports that extend along the longitudinal axis of the branch vessel rather than relying solely on radial flanges, creating anchoring in the longitudinal dimension to resist displacement from aortic pulsation
Solution Approach 2:
The proximal and distal supports are pre-configured in a compressed state within a delivery catheter and automatically expand to their functional anchoring configuration upon deployment, ensuring immediate stabilization of the branch stent tube at the fenestration site
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
The design effectively anchors the stent to the main stent tube, reducing the risk of dislodgment and maintaining stable blood flow by ensuring secure fixation and minimizing internal leakage.
Implementation Method 1
When the vascular stent is expanded from the compressed configuration to an expanded configuration, a free end of the proximal support expands towards a distal end of the vascular stent, and a free end of the distal support expands towards a proximal end of the vascular stent
Data Source
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AI summary
A vascular stent, including an inner stent tube as well as a proximal support and a distal support which are arranged on an outer wall of the inner stent tube. When the vascular stent is in a compressed configuration, the proximal support and the distal support are both folded and close to the outer wall of the inner stent tube; when the vascular stent is expanded from the compressed configuration to an expanded configuration, a free end of the proximal support expands towards the distal end of the vascular stent, and a free end of the distal support expands towards the proximal end of the vascular stent. The vascular stent can be anchored to a main stent tube in a blood vessel by the proximal support and the distal support, preventing the vascular stent from shifting or becoming dislodged after being transplanted into the main stent tube.