Vaso-Occlusive Device With Braided Mesh, Coil, and Stretch Resistance
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Solution Overview
Problem
Existing vaso-occlusive devices face performance limitations such as breaking performance, shape retention, and flexibility, primarily due to the dependence of stretch-resistant members on the structural characteristics of braided portions, leading to high manufacturing complexity and cost.
Innovation Solution
The development of vaso-occlusive devices with a mesh portion and a stretch-resistant member independent of the mesh portion, where the stretch-resistant member is coupled to a coil to maintain structural characteristics, and a junction physically attaches the mesh, stretch-resistant member, and coil together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stretch-resistant members are made from the same braided portion wires, then device flexibility is maintained, but device strength and manufacturing complexity deteriorate
Solution Approach 1:
The device is divided into distinct functional components: a mesh portion made from braided wires for flexibility, and separate stretch-resistant members made from solid wires for strength. This segmentation allows each component to be optimized independently for its specific function while simplifying the manufacturing process by using standardized components.
Solution Approach 2:
The device combines different material structures - a braided mesh portion with solid stretch-resistant members - to achieve both flexibility and strength. The composite construction allows the mesh portion to provide conformability while the solid stretch-resistant members provide tensile strength, overcoming the limitations of using uniform materials.
2Ease of operation
If stretch-resistant members depend on braided portion structure, then device flexibility is maintained, but breaking performance deteriorates
Solution Approach 1:
By separating the stretch-resistant function into independent solid wire members rather than relying on the braided structure, the design maintains flexibility through the mesh portion while ensuring breaking performance through the dedicated stretch-resistant members that can withstand tensile forces without compromising the mesh's conformability.
Solution Approach 2:
The composite structure combines the flexibility of braided mesh wires with the strength of solid wire stretch-resistant members. This material combination ensures that the device maintains ease of operation through flexibility while achieving reliable breaking performance through the reinforcement provided by the solid wire members.
3Reliability
If complex assembly procedures are used, then device performance is optimized, but manufacturing cost and time increase
Solution Approach 1:
The device is constructed from pre-formed, standardized components (mesh portion and stretch-resistant members) that can be assembled through simple procedures. This segmentation eliminates complex assembly steps while maintaining device performance, as each component is manufactured independently to specification and then quickly joined together.
Solution Approach 2:
By changing the manufacturing approach from custom assembly to standardized component production, the design maintains optimal device performance while significantly improving manufacturing efficiency. The stretch-resistant members are manufactured as standardized solid wire components rather than custom-braided elements, enabling faster production and lower costs.
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 design enhances the strength and flexibility of the vaso-occlusive devices, improves manufacturing efficiency by reducing the complexity of assembly, and lowers production costs while maintaining effective vascular occlusion.
Implementation Method 1
a first stretch resistant member coupled to the proximal coil to restrict the proximal coil from being stretched
Implementation Method 2
a proximal junction that physically attaches together the proximal end of the mesh portion, the distal end of the first stretch resistant member, and the distal end of the proximal coil
Data Source
AI summary
A vaso-occlusive treatment system includes a delivery assembly and a vaso-occlusive device detachably coupled to the delivery assembly by a delivery assembly junction. The vaso-occlusive device includes a braided portion formed out of one or more wires, the braided portion including a packed end bundle. The vaso-occlusive device also includes a coiled portion coupled to the braided portion. The vaso-occlusive device further includes an intra-device junction coupling the braided portion to the coiled portion, the intra-device junction including a stretch-resistant member spanning from the packed end bundle to the delivery assembly junction.