Stent with Microbead Coating for Anti-Migration
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Solution Overview
Problem
Implantable stents tend to migrate within body lumens due to their flexible properties and the moist, lubricious environment, and while designs to prevent migration can make them difficult to remove, existing solutions fail to balance anti-migration with repositionability.
Innovation Solution
An expandable stent with a covering composition featuring microbeads on its surface, which creates a textured surface that prevents migration by increasing friction and anchors the stent in place, while allowing for easy removal by reducing tissue ingrowth through a physical barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stent is designed with flexible and compressible properties to assist in delivery, then the ease of operation is improved, but the stent has a tendency to migrate from its deployed position
Solution Approach 1:
The stent surface is segmented into multiple discrete microbeads rather than a continuous surface, creating distinct friction points that collectively prevent migration while maintaining overall stent flexibility
Solution Approach 2:
The stent incorporates microbeads with specific physical properties (size, shape, material composition) at the surface level while maintaining the bulk flexibility of the stent structure, creating localized high-friction zones without compromising overall device compliance
2Stability of the object's composition
If bare metal portions of the stent are exposed to promote tissue ingrowth and reduce migration, then the stability is improved, but the stent becomes more difficult to remove
Solution Approach 1:
The microbead surface properties are engineered to provide controlled friction that resists migration forces during normal operation but allows deliberate removal when needed, changing the interaction parameters between stent and tissue over time
3Ease of repair
If a covering is applied to reduce tissue ingrowth and facilitate removal, then the ease of repair is improved, but the stent becomes more prone to migration
Solution Approach 1:
The stent combines the smooth non-adherent properties of a covering material with the high-friction characteristics of microbeads embedded in or on the covering, creating a composite surface that prevents migration while maintaining removability
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 reduces migration within body lumens while maintaining repositionability and ease of removal by utilizing a microbead-coated surface that enhances surface friction and prevents tissue anchoring.
Implementation Method 1
the granular particles are designed to prevent migration of the expandable scaffold upon implantation in the body lumen
Data Source
AI summary
An example medical device for treating a body lumen is disclosed. The medical device includes an expandable scaffold including a first end region, a second end region opposite the first end region and an outer surface. The medical device also includes a covering disposed along the outer surface of the expandable scaffold, the covering having an outer surface. The medical device further includes a plurality of granular particles disposed along the covering. Additionally, the expandable scaffold is configured to shift from a collapsed state to an expanded state, the covering is configured to contact an inner surface of the body lumen in the expanded state and the granular particles are designed to prevent migration of the expandable scaffold upon implantation in the body lumen.