Modular Multibranch Stent Assembly for Aortic Branch Perfusion
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Solution Overview
Problem
Existing stent-grafts face challenges in bypassing diseased regions of the aorta while ensuring critical branch arteries are not covered or occluded, requiring precise alignment and sealing to maintain blood flow.
Innovation Solution
A modular stent graft assembly with a main body and branch coupling, including a modular stent device that bifurcates at a bifurcation point to provide separate pathways for critical arteries, ensuring proper alignment and sealing without obstructing branch arteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent-graft is placed to seal off the diseased portion of the aorta, then the diseased region is bypassed effectively, but critical branch arteries may be covered or occluded
Solution Approach 1:
The stent-graft is divided into multiple functional segments: a main body portion for sealing the diseased aortic segment, and separate branch couplings that can be selectively positioned to align with critical branch arteries. This segmentation allows the device to simultaneously achieve effective sealing while preserving branch artery patency through spatial separation of functions.
2Reliability
If the stent-graft is designed to seal against the aorta wall, then effective bypass is achieved, but alignment precision with branch arteries becomes more difficult
Solution Approach 1:
The branch couplings are pre-configured with radiopaque markers and positioning features that enable preliminary alignment visualization during deployment. These markers allow the operator to pre-position the branch couplings in correct alignment with branch arteries before final deployment, simplifying the alignment process and reducing the precision requirements for the final sealing action.
3Adaptability or versatility
If a single branch stent device is used, then branch artery perfusion is maintained, but modular adaptability for different anatomical configurations is limited
Solution Approach 1:
The stent-graft system is segmented into a main body and separate modular branch coupling units. Each branch coupling can be independently selected and positioned to match different anatomical configurations. This modular segmentation provides versatility for various anatomical scenarios while keeping individual components relatively simple in structure.
Data Source
AI summary
A stent graft assembly including a main body and a branch coupling extending radially from the main body. A proximal end of the single branch stent device is configured to seal in an ascending portion of an aorta. The assembly further includes a modular stent device including a proximal end and a distal end. The proximal end of the modular stent graft is configured to couple to a distal end of the single branch stent device. The modular stent device includes a main body configured to couple inside the main body of the single branch stent device. The modular stent device includes a bypass gate and an artery leg. The modular stent device is configured to bifurcate at a bifurcation point from the main body to the bypass gate and the artery leg outside of and distal the distal end of the single branch stent device.