Neutral Hybrid Braided Medical Device for Stable Catheter Delivery
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Solution Overview
Problem
Hybrid braided medical devices experience unintentional rotation during delivery, leading to detachment or binding issues due to helical bias, which can cause deformation and failure of the device and delivery member.
Innovation Solution
A neutral hybrid braided pattern is created by alternating clockwise and counterclockwise wire crossings to counteract rotational forces, minimizing device rotation and ensuring secure deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hybrid braided pattern is used to achieve desired device properties, then the device can be delivered through a catheter, but unintentional rotation occurs during delivery causing detachment or binding issues
Solution Approach 1:
The patent applies asymmetry by using wires of different diameters in the braid pattern (hybrid braiding with larger and smaller diameter wires), which creates a non-uniform structure that enables delivery through catheters while the alternating hand pattern compensates for rotational forces
Solution Approach 2:
The patent implements preliminary anti-action by alternating the braid pattern between right-handed and left-handed configurations along the length of the device. This alternating pattern creates counteracting rotational forces that prevent unintentional rotation during delivery, addressing the rotational instability problem before it occurs
2Strength
If wires of different diameters are used to create hybrid braid, then desired stiffness and cross-sectional area are achieved, but helical bias is created causing rotation
Solution Approach 1:
The patent applies local quality by varying the wire diameters at different positions within the braid structure. Larger diameter wires provide stiffness where needed, while smaller diameter wires reduce helical bias, creating a non-uniform distribution of properties that balances structural requirements with rotational stability
Solution Approach 2:
The patent uses inversion by alternating the handedness of the braid pattern between right-handed and left-handed sections. This reverses the direction of helical bias in alternating segments, causing the rotational forces to counteract each other and eliminate net rotation during delivery
3Reliability
If a neutral hybrid braided pattern is implemented to prevent rotation, then delivery reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the braid into alternating segments of right-handed and left-handed patterns. Each segment maintains a consistent hybrid wire configuration, but the alternation between opposite hands creates the neutral rotational effect, breaking down the complex neutral pattern into manageable repeating units
Solution Approach 2:
The patent implements periodic action by repeating the alternating right-handed and left-handed braid pattern at regular intervals along the length of the device. This periodic alternation creates a rhythmic cancellation of rotational forces, achieving rotational neutrality through a predictable, repeating structure rather than a random or continuously varying pattern
Data Source
AI summary
A method for making a neutral hybrid braided structure may involve positioning a first set of wires on a braiding machine in a first set of positions, positioning a second set of wires on the braiding machine in a second set of positions so that the first set of positions and the second set of positions form a neutral hybrid braiding pattern, and braiding the first set of wires and the second set of wires on the braiding machine to form the neutral hybrid braided structure. Each wire in the first set of wires has a first cross-sectional diameter, and each wire in the second set of wires has a second cross-sectional diameter that is smaller than the first cross-sectional diameter.