Vaso-occlusive Device with Reduced Distal Diameter

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Solution Overview

Problem

Existing vaso-occlusive devices face challenges in effectively occluding aneurysms due to the distal loop herniating into the parent vessel during deployment, making it difficult to place complex-shaped coils within the aneurysm without 'snaking' out.

Innovation Solution

The design features a vaso-occlusive device with a proximal portion having a complex three-dimensional relaxed configuration and a distal portion with a diameter at least 10% smaller, which can be a two- or three-dimensional configuration, such as one or more loops, allowing for easier placement by reducing the risk of herniation and facilitating deployment within the aneurysm.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a complex three-dimensional shape is used for the vaso-occlusive device, then occlusion efficacy is improved, but deployment difficulty increases due to distal loop herniation into the parent vessel

Engineering Contradiction:

Improveocclusion efficacyVSAvoiddeployment ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The device is segmented into a proximal portion with complex three-dimensional shape and a distal portion with reduced diameter. This segmentation allows the proximal portion to provide effective occlusion while the distal portion's smaller size prevents herniation during deployment, resolving the contradiction between occlusion efficacy and deployment ease.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the device have different local qualities: the proximal portion has a complex three-dimensional shape optimized for occlusion, while the distal portion has a reduced diameter specifically for facilitating deployment. This local differentiation resolves the contradiction by optimizing each portion for its specific function.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the distal loop size is increased to improve anchoring, then occlusion stability is improved, but the risk of herniation during deployment increases

Engineering Contradiction:

Improveocclusion stabilityVSAvoidherniation risk

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The device divides the loop structure into proximal and distal portions with different diameters. The distal portion's smaller diameter specifically addresses herniation risk while the proximal portion maintains adequate loop size for stability, resolving the contradiction between stability and herniation prevention.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The diameter parameter is changed along the length of the device, with the distal portion having a smaller diameter than the proximal portion. This parameter variation allows the distal portion to prevent herniation while the proximal portion provides sufficient anchoring for stability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9055948B2Vaso-occlusive devices comprising complex-shape proximal portion and smaller diameter distal portion

Publication Date: 2015.06.16 STRYKER CORP

AI summary

This is a device for occluding a space within the body. In particular, the device comprises a proximal portion having a complex, three-dimensional shape and a distal portion, where the diameter of the shape defined by the distal portion is smaller than the diameter of the shape defined by the proximal portion. The devices may be placed in a desired site within a mammal and are useful in occluding devices.