Stent Cover Bonding Segments Axial Flexibility
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Solution Overview
Problem
Existing covered stent devices face challenges in balancing axial flexibility and preventing restenosis, as the stent cover can reduce flexibility and lead to reduced therapeutic effectiveness due to fixed bending locations and potential entanglement of interlocking wire structures.
Innovation Solution
A stent device with a stent cover that bonds to the stent wires at locations other than interlocking structures, maintaining flexibility by separating bonding points from interlocking areas and preventing tissue ingrowth, using multiple bonding portions along stent wires between interlocking structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stent cover is applied to prevent restenosis, then tissue ingrowth is prevented, but axial flexibility is reduced
Solution Approach 1:
The stent cover is segmented into multiple sections with bonding areas and non-bonding areas along the axial direction. The bonding areas prevent restenosis by adhering to the stent body, while the non-bonding areas maintain axial flexibility by allowing relative movement between the cover and stent body in those regions.
Solution Approach 2:
Different regions of the stent cover have different functional properties: bonding areas with adhesive characteristics to prevent tissue ingrowth, and non-bonding areas with flexible characteristics to enable axial movement. This local differentiation resolves the contradiction between preventing restenosis and maintaining flexibility.
2Stability of the object's composition
If the stent cover bonds to the stent body, then stability is improved, but flexibility at bonding locations is reduced
Solution Approach 1:
The stent cover is divided into multiple bonding areas and non-bonding areas along its length. This segmentation allows the cover to have both stable bonded regions and flexible non-bonded regions, resolving the contradiction between overall stability and local flexibility.
Solution Approach 2:
The stent cover transitions from a static fully-bonded structure to a dynamic structure with alternating bonded and non-bonded sections. The non-bonded sections allow dynamic axial movement while the bonded sections provide static stability, enabling the stent to adapt to varying structural requirements along its length.
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 solution enhances axial flexibility and prevents restenosis by allowing the stent to adapt to complex lumen shapes while maintaining effective positioning and reducing tissue growth into the stent, thereby improving therapeutic outcomes.
Implementation Method 1
a first stent cover portion located on an inner surface of the stent body and a second stent cover portion located on an outer surface of the stent body, wherein the first stent cover portion and the second stent cover portion are bonded to each other at a plurality of bonding portions
Data Source
AI summary
Stent device has a stent cover bonding to the stent wires forming the stent body at a plurality of bonding portions that are remote from the cross over points of the stent wire. By allocating the bonding portions to the stent wires in between the cross over portions, the axial flexibility of the stent device is maintained. The stent cover bonded by the disclosed bonding portions contributes to preventing lumen tissues to penetrate into the stent body and clogging the stent while placement of the bonding portions bonding the stent cover to the stent device provides variations of positive effects to the cover stent device and to the patient in which the stent device is placed.