Retrieval-Suture Stent Collapse for Pyloric Leakage Control
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Solution Overview
Problem
Existing stents used to treat gastric outlet obstruction often result in gastric leakage due to maintaining the pylorus in a continually open position, necessitating alternative designs that allow for immediate blockage while preserving natural pyloric function.
Innovation Solution
A stent design featuring a retrieval suture interwoven with a stent frame, comprising suture loops that can be actuated to partially or fully collapse the stent, allowing for repositioning and removal, and optionally incorporating a flexible sleeve that collapses under natural sphincter pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a stent is designed to maintain the pylorus in a continually open position, then gastric outlet obstruction is treated, but gastric leakage occurs
Solution Approach 1:
The stent incorporates a retrieval suture system with multiple suture loops that can dynamically change the stent's state from open to collapsed, allowing the pylorus to transition between open and closed positions rather than remaining continually open, thereby treating obstruction while preventing gastric leakage
Solution Approach 2:
The stent design allows changing the physical state parameter from a fixed open structure to a dynamically adjustable structure through the retrieval suture mechanism, enabling control over the degree of opening/closing to balance treatment effectiveness with prevention of gastric leakage
2Reliability
If a stent is implanted to treat gastric outlet obstruction, then immediate blockage is achieved, but removal and repositioning becomes difficult
Solution Approach 1:
The retrieval suture is divided into multiple segments including a first suture loop, second suture loop, and interconnecting segments, allowing sequential engagement and collapse of different stent portions, making the removal process more manageable and less traumatic
Solution Approach 2:
The retrieval suture acts as an intermediary mechanism between the operator and the stent, providing a controlled method to engage, collapse, and remove the stent without requiring direct manipulation of the stent structure itself, thereby facilitating easier removal while maintaining blockage effectiveness
3Reliability
If a stent is designed to maintain continuous blockage, then gastric outlet obstruction is treated, but natural pyloric function is lost
Solution Approach 1:
The stent system transitions from a static continuous blockage design to a dynamic system where the retrieval suture can be adjusted to allow the pylorus to open and close naturally, preserving pyloric function while maintaining the ability to treat obstruction when needed
Solution Approach 2:
The stent can be temporarily deployed to treat obstruction, then removed or repositioned using the retrieval suture mechanism, allowing the natural pyloric function to be recovered and preserved after the obstruction is resolved
Data Source
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AI summary
An illustrative endoluminal implant having an elongated tubular member. The elongated tubular member having a stent and a retrieval suture interwoven with the stent. The retrieval suture including a first suture loop extending about a circumference of the stent and adjacent to a suture retrieval loop and a second suture loop extending about a circumference of the stent and longitudinally spaced from the first suture loop. The first and second suture loops coupled via one or more interconnecting segments. At least one of the first or second suture loops has an arc length of less than 270° of the circumference of the stent.