False Lumen Occluder With Gapless Barrier And Nested Catheter
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Solution Overview
Problem
Current methods for closing false lumens caused by aortic dissections often fail to prevent backflow due to incomplete occlusion, leading to aneurysmal expansion and remodelling issues.
Innovation Solution
A false lumen closure assembly featuring a stent graft with a gapless occlusive barrier and a carrier catheter system that allows for rapid and effective deployment of the occluder, ensuring complete occlusion of blood flow through the false lumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent graft is used to close the upstream end of the false lumen, then the false lumen can be occluded, but backflow from downstream tears can still occur
Solution Approach 1:
The false lumen is divided into multiple segments: the upstream end is closed by the stent graft, and downstream tears are sealed by embolic particles delivered through delivery catheters. This segmentation allows independent treatment of different leak locations, achieving complete occlusion by addressing each segment separately.
Solution Approach 2:
Embolic particles serve as an intermediary substance to seal downstream tears in the false lumen wall. These particles are delivered through the lumen of the stent graft via delivery catheters and accumulate at the tear sites, creating a seal that prevents backflow without requiring direct surgical intervention at the tear locations.
2Reliability
If an occluding device with a valve element is used to prevent backflow, then backflow through the false lumen is prevented, but the device complexity increases
Solution Approach 1:
Instead of using a complex, expensive, permanent valve element, the invention employs disposable embolic particles that are delivered once and remain in place to seal tears. These particles are simple, inexpensive, and effectively perform the backflow prevention function without requiring complex mechanical valve structures.
3Ease of operation
If the false lumen occluder is delivered through a carrier catheter, then the delivery system is established, but the carrier catheter may interfere with complete occlusion
Solution Approach 1:
The delivery system uses a nested structure where the carrier catheter is positioned within the stent graft lumen, and embolic particles are delivered through the carrier catheter lumen. This nested arrangement allows the delivery system to be introduced through the stent graft without compromising the occlusion, as the particles are delivered through the center of the stent graft structure.
Data Source
AI summary
Disclosed is a false lumen closure assembly for closing a false lumen in a body vessel including a compressed false lumen occluder, a carrier catheter and a retractable sheath. The compressed false lumen occluder includes a stent graft including at least one occlusive barrier across the stent graft to occlude blood flow through an interior of the stent graft. The carrier catheter carries the false lumen occluder and extends from a proximal end proximal of the false lumen occluder to a distal end distal of the false lumen occluder, and passes the false lumen occluder exteriorly of the stent graft. The compressed false lumen occluder and at least part of the carrier catheter are disposed in a lumen of the retractable sheath.