Stent Graft Delivery With Wire-Loop Radial Constriction Control
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Solution Overview
Problem
Existing endovascular repair methods for aortic aneurysms face challenges in accurately deploying stent grafts to span the aneurysm ends, ensuring complete exclusion of the aneurysm sac, anchoring in the aorta, and minimizing endoleaks while maintaining blood flow, particularly in regions with vital organ branches.
Innovation Solution
A stent graft delivery system with a handle, guidewire catheter, and at least one tube, featuring a wire loop that can be variably controlled to radially constrict or expand stents, allowing precise axial and longitudinal alignment of the stent graft at the aneurysm site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stent graft is deployed in a fixed radial expansion state, then the deployment process is simple, but the ability to adjust orientation and alignment at the implant site is limited
Solution Approach 1:
The stent graft is designed with dynamically adjustable radial expansion capability through a delivery system that allows selective balloon inflation. This enables the stent to transition from a compressed delivery state to an expanded deployed state, providing orientation adjustment capability while maintaining a relatively simple deployment process through controlled balloon inflation
2Ease of operation
If a stent graft is fully expanded during delivery, then positioning is easier, but the ability to rotate and reposition before final implantation is lost
Solution Approach 1:
The delivery system performs preliminary positioning and orientation adjustments while the stent graft remains in a compressed or partially expanded state within the delivery catheter. This allows the operator to navigate the stent to the correct location and orientation before final expansion, reducing vascular injury risk while maintaining positioning ease through pre-positioning capabilities
3Productivity
If the stent graft is deployed without radial constriction control, then the implantation is faster, but the ability to maintain intended shape and reduce distortion is compromised
Solution Approach 1:
The delivery system controls the radial expansion parameter of the stent graft through controlled balloon inflation pressure and timing. By adjusting these parameters, the system maintains the stent's intended shape and reduces distortion during implantation while keeping the process efficient. The selective balloon inflation allows precise control over expansion timing and extent
Data Source
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AI summary
A stent graft delivery system includes a handle, a guidewire catheter extending distally from the handle, at least one tube, and at least one wire extending through the at least one tube, wherein each wire of the stent graft delivery system is configured as a loop at the distal end of the tube. The stent graft delivery system can be employed to implant stent grafts in a patient to thereby treat, for example, an aortic aneurysm spanning a region of an aorta that includes at least one arterial branch.