Emembolic Coil Fiber Bundle Distribution for Deployment

Solution Overview

Problem

Existing embolic coils face challenges in efficient delivery due to high friction during deployment, which can lead to buckling and jamming, especially when fiber bundles are unevenly distributed, affecting column strength and deployment force application.

Innovation Solution

The embolic coil system includes a catheter with a delivery end and an embolic coil having fiber bundles attached to the coil wire, where the distance from the first bundle end to the catheter's delivery end is less than from the second bundle end, optimizing fiber bundle distribution to reduce friction and enhance column strength near the deployment point.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If fiber bundles are evenly distributed along the embolic coil, then the coil structure is simple and manufacturing is easier, but the column strength is insufficient near the deployment point causing buckling and jamming

Engineering Contradiction:

Improvecolumn strengthVSAvoidfiber bundle distribution

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The fiber bundles are distributed non-uniformly along the coil, with higher density near the deployment point (proximal end) and lower density toward the distal end. This local variation in fiber density provides enhanced column strength where the deployment force is applied, while maintaining simpler structure in regions where less strength is needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The fiber bundle distribution is intentionally made asymmetric, with the majority of fiber bundles concentrated in the proximal half of the coil (within approximately 50% of the coil length from the deployment point). This asymmetric distribution optimizes the structural properties at the critical deployment location without unnecessarily complicating the entire coil structure.

Inventive Principle:

Principle #4Asymmetry

2Strength

If fiber bundles are concentrated near the deployment point, then column strength is enhanced, but friction during deployment increases leading to buckling and jamming

Engineering Contradiction:

Improvecolumn strengthVSAvoiddeployment smoothness

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The fiber bundles are distributed non-uniformly along the coil, with higher density near the deployment point (proximal end) and lower density toward the distal end. This local variation in fiber density provides enhanced column strength where the deployment force is applied, while maintaining simpler structure in regions where less strength is needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The fiber bundle distribution is intentionally made asymmetric, with the majority of fiber bundles concentrated in the proximal half of the coil (within approximately 50% of the coil length from the deployment point). This asymmetric distribution optimizes the structural properties at the critical deployment location without unnecessarily complicating the entire coil structure.

Inventive Principle:

Principle #4Asymmetry

3Strength

If more fiber bundles are attached to the coil, then column strength increases, but the friction during deployment increases causing jamming

Engineering Contradiction:

Improvecolumn strengthVSAvoiddeployment ease

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The fiber bundles are distributed non-uniformly along the coil, with higher density near the deployment point (proximal end) and lower density toward the distal end. This local variation in fiber density provides enhanced column strength where the deployment force is applied, while maintaining simpler structure in regions where less strength is needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The fiber bundle distribution is intentionally made asymmetric, with the majority of fiber bundles concentrated in the proximal half of the coil (within approximately 50% of the coil length from the deployment point). This asymmetric distribution optimizes the structural properties at the critical deployment location without unnecessarily complicating the entire coil structure.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS12178438B2Deploying embolic coils

Publication Date: 2024.12.31 BOSTON SCIENTIFIC SCIMED INC

AI summary

An embolic coil delivery system includes a catheter and an embolic coil disposed within the catheter, the embolic coil including a coil wire and a fiber bundle. A method of producing an embolic coil delivery system includes: advancing a delivery sheath over a distal end of an embolic coil while applying tension to the embolic coil via a retaining device that is attached to the distal end of the embolic coil.