Embolic Coil Alternating Diameters Flat Segment
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Solution Overview
Problem
Conventional embolic coils with a convex-concave structure face difficulties in smoothly forming a frame within an aneurysm due to catching issues, and their fixed size and shape cannot accommodate aneurysm expansion or deformation, leading to unstable positioning and poor operability.
Innovation Solution
An embolic coil with a spirally wound design featuring alternating large and small diameter coil portions and a continuous flat surface cylindrical structure, allowing for smooth frame formation and adaptation to aneurysm expansion, with the cylindrical structure providing a stronger repulsive force to maintain position and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a convex-concave structure with alternating large and small diameter coil portions is used, then the embolic coil can form a stable frame structure, but the large diameter coil portions tend to get caught or hang up during insertion, making smooth frame formation difficult
Solution Approach 1:
The embolic coil is divided into two distinct functional segments: a first coil portion with alternating large and small diameter portions for frame stability, and a second flat cylindrical coil portion for smooth insertion. This segmentation allows each part to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different portions of the embolic coil are given different structural qualities: the first coil portion has a convex-concave structure with varying diameters to provide stability, while the second coil portion has a uniform flat cylindrical structure to reduce catching during insertion. This local differentiation of properties solves the contradiction between stability and ease of insertion.
2Stability of the object's composition
If the frame is formed with a fixed size and shape, then the frame structure is stabilized, but the frame cannot follow up on the expansion and deformation of the aneurysm volume, leading to unstable positioning
Solution Approach 1:
The embolic coil is designed with dynamic characteristics through its second flat cylindrical coil portion that can expand and deform elastically to follow the aneurysm's volume changes. This dynamic property allows the frame to maintain stable positioning while adapting to the expanding aneurysm, resolving the contradiction between stabilization and adaptability.
3Ease of operation
If the embolic coil is repeatedly withdrawn and pushed forward to resolve catching issues, then the coil can be inserted, but the time needed to fill the embolic coil increases, resulting in poor operability
Solution Approach 1:
By segmenting the coil into a smooth second cylindrical portion for insertion and a structured first portion for framing, the design enables continuous forward motion during insertion without repeated withdrawals, significantly reducing the time and improving operability.
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 embolic coil effectively reduces catching during frame formation, stabilizes the frame within the aneurysm, and adapts to volume changes, ensuring stable positioning and efficient filling, even in irregularly shaped aneurysms.
Implementation Method 1
the second coil portion, which is continuous with the first coil portion and wound to have a flatter surface than the first coil portion... the cylindrical structure providing a stronger repulsive force to maintain position and stability
Data Source
AI summary
An embolic coil is formed by being spirally wound by an element wire and is filled into an aneurysm. The embolic coil includes: a first coil portion, in which a large-diameter coil portion wound to have a large diameter D1 and a small-diameter coil portion wound to have a diameter D2 smaller than the large-diameter coil portion are arranged in a plurality of coils and alternately in a longitudinal direction Y of the embolic coil. A second coil portion is wound to be continuous with the first coil portion and to have a surface flatter than the first coil portion.