Segmented Stent with Polymeric Coating for Peristaltic Movement
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Solution Overview
Problem
Existing medical stents face challenges in accommodating peristaltic forces within the gastrointestinal system without dislodgment, as they are often subjected to foreign body expulsion forces and peristaltic movements.
Innovation Solution
The design incorporates a central stent segment with proximal and distal stent segments, each with a polymeric coating that allows for translation relative to the central segment in response to peristaltic forces, while also providing stability through coupling and limiting movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stent is made rigid to maintain structural support, then it can effectively hold open the gastrointestinal structure, but it becomes susceptible to dislodgment from peristaltic forces and foreign body expulsion
Solution Approach 1:
The stent is divided into multiple segments (first stent segment, central stent segment, second stent segment) that can move independently relative to each other. This segmentation allows the stent to maintain overall structural support while individual segments can translate axially to accommodate peristaltic forces and expulsion pressures, preventing dislodgment.
Solution Approach 2:
The stent incorporates dynamic elements including a polymeric coating that allows controlled movement between segments, and a compression element that can deform under axial compression forces. This dynamic behavior enables the stent to adapt to physiological forces while maintaining its position and structural function.
2Reliability
If a stent is made flexible to accommodate peristaltic movement, then it resists dislodgment, but it loses structural support capability
Solution Approach 1:
By segmenting the stent into multiple independent sections connected by flexible elements, the stent achieves both flexibility for movement and structural support. Each segment maintains rigidity for support while the connections between segments provide flexibility to accommodate peristalsis.
Solution Approach 2:
The stent combines rigid stent segments with a polymeric coating material that provides flexibility and controlled movement. This composite structure allows the stent to simultaneously exhibit both structural support properties and flexibility to resist dislodgment from peristaltic forces.
3Stability of the object's composition
If the stent segments are tightly coupled to prevent movement, then stability is improved, but the stent cannot accommodate peristaltic forces without dislodgment
Solution Approach 1:
The stent employs dynamic coupling through a polymeric coating that allows controlled axial translation of segments relative to each other. This dynamic connection maintains stability while accommodating peristaltic forces, preventing dislodgment by allowing movement rather than rigidly constraining the segments.
Solution Approach 2:
A polymeric coating acts as a flexible connection between stent segments, allowing controlled movement and translation. This thin film structure provides both coupling to maintain stability and flexibility to accommodate physiological forces without dislodgment.
4Reliability
If the stent allows free movement of segments to accommodate peristalsis, then resistance to dislodgment is improved, but positional control and stability are lost
Solution Approach 1:
The polymeric coating provides flexible yet controlled connection between segments, allowing movement to accommodate peristalsis while maintaining positional stability. The coating acts as a constrained flexible element that permits necessary translation but prevents excessive or uncontrolled movement.
Solution Approach 2:
The stent employs dynamic elements including a polymeric coating and compression element that allow controlled movement. This dynamic design enables the stent to adapt to peristaltic forces while maintaining positional stability through the constrained nature of the flexible connections.
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
This configuration effectively resists peristaltic movement and foreign body expulsion forces, ensuring the stent remains in place while allowing for axial movement of the central stent segment relative to the proximal and distal segments.
Implementation Method 1
Upon implantation, the proximal stent segment and/or the distal stent segment are adapted to translate relative to the central stent segment in response to peristaltic forces
Implementation Method 2
the polymeric coating may couple the proximal stent segment and the distal stent segment to the central stent segment and may limit how far the proximal stent segment and/or the distal stent segment are able to move relative to the central stent segment
Data Source
AI summary
A medical stent includes a central stent segment, a proximal stent segment adapted to be positioned over a proximal region of the central stent segment, and a distal stent segment adapted to be positioned over a distal region of the central stent segment. A polymeric coating extends over the proximal stent segment, the distal stent segment and at least a portion of the central stent segment, the polymeric coating adapted to allow the proximal stent segment to float over the proximal region of the central stent segment and to allow the distal stent segment to float over the distal region of the central stent segment. Upon implantation, the central stent segment is adapted to translate relative to the proximal stent segment and the distal stent segment in response to peristaltic forces.