Stent Graft Diameter Reduction Constraint Arrangement
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Solution Overview
Problem
The positioning of stent grafts in the aorta is challenging due to their larger diameter design, which can lead to occlusion of branch arteries, and existing diameter reduction techniques are difficult and time-consuming, increasing the risk of errors during assembly.
Innovation Solution
A temporary diameter reduction constraint arrangement for stent grafts, featuring elongate receivers and serpentine wires that loop over a guide wire cannula, allowing for precise positioning and easy adjustment, with optional thread loops to further reduce the stent graft diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the stent graft diameter is made larger to allow for accurate sealing and relaxation, then sealing accuracy is improved, but the risk of occluding branch arteries increases
Solution Approach 1:
The stent graft is designed with dynamic diameter adjustment capability through incorporating diameter reduction ties and constraint arrangements that allow the diameter to be changed from an initial larger state to a reduced state, enabling the graft to adapt to different vessel conditions and avoid branch artery occlusion while maintaining sealing accuracy
2Manufacturing precision
If diameter reducing ties are used to assist positioning after release, then positioning accuracy is improved, but assembly complexity and time increase
Solution Approach 1:
The diameter reducing ties and constraint arrangements are pre-assembled onto the stent graft during manufacturing, so that the positioning function is already prepared before implantation. This eliminates the need for complex intra-procedural assembly and reduces the risk of assembly errors while maintaining positioning accuracy
3Manufacturing precision
If diameter reducing ties are used to assist positioning after release, then positioning accuracy is improved, but assembly time increases
Solution Approach 1:
The diameter reducing ties and constraint arrangements are pre-assembled onto the stent graft during manufacturing, so that the positioning function is already prepared before implantation. This eliminates the need for complex intra-procedural assembly and reduces the risk of assembly errors while maintaining positioning accuracy
Data Source
AI summary
A temporary diameter reduction constraint arrangement for a stent graft in combination with a stent graft is disclosed. The stent graft has a proximal end and a distal end and comprises a biocompatible graft material tube and a plurality of longitudinally spaced apart self-expanding stents fastened thereto, including at least an end stent and a plurality of intermediate stents. The constraint arrangement comprises: an elongate receiver extending longitudinally within the graft material tube; a first wire extending longitudinally along the graft material tube in a first serpentine pattern; and a second wire extending longitudinally along the graft material tube in a second serpentine pattern, wherein at least one of the first and second wires repeatedly loops over the receiver along a longitudinal length of the stent graft thereby securing the stent graft to the receiver. In one embodiment there is also a plurality of loops of thread to reduce the stent graft.