Detachable Stent Anchor for Migration Prevention
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Solution Overview
Problem
Stents used in bodily lumens, such as the esophageal tract, are prone to migration, which can cause damage to surrounding tissue and hinder their ability to maintain a desired pathway, especially when designed for temporary deployment, as tissue ingrowth complicates removal and repositioning.
Innovation Solution
A stent design featuring a tubular stent body with a detachable anchor portion that facilitates tissue ingrowth, allowing for secure anchorage while enabling detachment from the stent body, either by material degradation or a ripcord mechanism, to prevent migration and simplify removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stent is designed with openings to facilitate tissue ingrowth to prevent migration, then the stent stability is improved, but the ease of removal deteriorates when tissue ingrowth occurs
Solution Approach 1:
The stent is divided into two separable components: a stent body and an anchor portion. The anchor portion with tissue-engaging features can be detached from the stent body, allowing the stent body to be removed while leaving the anchor portion in place to maintain stability and prevent migration.
Solution Approach 2:
The anchor portion is extracted as a separate detachable component from the stent body. This allows the harmful effect of tissue ingrowth to be isolated to the anchor portion, which remains after removal of the main stent body, thus maintaining stability without compromising ease of removal of the stent body.
2Adaptability or versatility
If a stent is designed for temporary deployment, then the adaptability is improved, but the reliability deteriorates due to migration risk
Solution Approach 1:
The stent system is segmented into a temporary stent body and a permanent anchor portion. The stent body can be removed after temporary deployment, while the anchor portion remains to provide ongoing migration prevention and lumen maintenance, thus maintaining both adaptability and reliability.
Solution Approach 2:
Different portions of the stent system have different functional properties: the stent body is designed for temporary support and removal, while the anchor portion is designed for permanent implantation with tissue-engaging features to prevent migration, providing localized quality appropriate to each function.
3Ease of operation
If an anchor portion is made detachable to simplify removal, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The detachable connection is achieved through segmentation of the stent into modular components (stent body and anchor portion) joined by simple connection mechanisms such as friction fits, interlocking features, or minimal fastening elements, balancing ease of removal with acceptable device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The stent effectively prevents migration and allows for safe removal by promoting tissue ingrowth through the anchor portion, ensuring stable lumen maintenance and reducing the risk of tissue damage during stent deployment and retrieval.
Implementation Method 1
the anchor portion includes at least one opening configured to facilitate tissue ingrowth
Implementation Method 2
The anchor portion may be detachable from the tubular stent body while the stent is in a deployed state
Data Source
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AI summary
A stent may include a tubular stent body having a lumen extending therethrough. The stent may further include an anchor portion attached to an end of the tubular stent body, where the lumen continues through the anchor portion, and where the anchor portion includes at least one opening configured to facilitate tissue ingrowth. The anchor portion may be detachable from the tubular stent body while the stent is in a deployed state.