Nasal Sinus Stent Weaving for Irregular Cavity Adaptation
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Solution Overview
Problem
Existing nasal sinus stents have poor adaptability due to their fixed, circular cross-section shape, which limits their ability to conform to the variable and complex internal spaces of the nasal cavity, especially in the presence of lesions.
Innovation Solution
A weaving method for a nasal sinus stent using a filament woven around a tool with uniformly spaced anchor points, forming a 'V' shaped pattern with specific angles and ratios, allowing the stent to expand and adapt to irregular nasal cavity shapes, and featuring a self-expanding configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed circular cross-section shape is used for the stent, then the manufacturing process is simple, but the adaptability to variable nasal cavity shapes is poor
Solution Approach 1:
The stent employs a dynamic structure that can transition between compressed and expanded configurations. The weaving pattern creates a flexible framework that adapts its shape to match the nasal cavity contours, moving from a simple circular cross-section during delivery to a complex adaptive shape during deployment, thereby resolving the contradiction between manufacturing simplicity and adaptability.
Solution Approach 2:
The stent utilizes parameter changes in its geometric configuration through the weaving pattern. By varying the weave angle, mesh size, and filament arrangement in different sections, the stent achieves different cross-sectional shapes (circular, oval, irregular) to match various nasal cavity geometries, thus improving adaptability without requiring multiple different stent designs.
2Adaptability or versatility
If a complex weaving pattern with multiple angles and ratios is used, then the shape adaptability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The complex weaving pattern is segmented into repeating modular units with standardized parameters. Each module contains a specific weave pattern that can be replicated throughout the stent structure, reducing manufacturing precision requirements by breaking down the complex overall pattern into manageable, repeatable segments with consistent geometric parameters.
Solution Approach 2:
The weaving pattern incorporates curved and rounded geometric transitions rather than sharp angles, creating smooth transitions between different cross-sectional shapes. This use of curvature reduces stress concentration points and simplifies the manufacturing process by eliminating the need for precise angular intersections, thereby maintaining shape adaptability while reducing precision requirements.
3Ease of operation
If the stent is designed for uniform compression, then the delivery process is simplified, but the expansion capability to various shapes is limited
Solution Approach 1:
The stent employs a nested configuration where the weaving pattern creates concentric layers and interlocking structures that allow uniform compression during delivery. The nested design enables the stent to be collapsed into a compact, uniformly compressible form for delivery while maintaining the underlying geometric framework that can expand into various shapes at the target site, thus resolving the contradiction between delivery simplicity and expansion capability.
Data Source
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AI summary
The present invention relates to a weaving method for a nasal sinus stent, comprising: providing a filament; providing a weaving tool having a longitudinal central axis, wherein the weaving tool comprises a first shaping part and a second shaping part which are axially spaced from each other, wherein the first shaping part is provided with n first anchor points, and the second shaping part is provided with n second anchor points; forming an initial configuration stent by around a circumferential direction of the weaving tool, allowing a single filament starting from 1st first anchor point on the first shaping part, coming across m1 vertex intervals to extend towards the second anchor point, and then coming across m2 vertex intervals to extend towards the first anchor point, so as to complete a first "V" shaped weaving path, and then repeating the "V" shaped weaving path until the single filament returns to the 1st first anchor point, wherein the initial configuration stent has a circumference and n vertices with vertex interval obtained by dividing the circumference by n; m1 and m2 are integral multiples of 0.5, the sum of m1+m2 is an integer, and the sum of m1+m2 is not an integral multiple of a divisor of n. The sinus stent obtained by the above weaving method has good shape adaptability and is particularly suitable for being used as a self-expanding stent in the nasal cavity.