Low-Tension Coil Occluding Device for Vessel Flow Control
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Solution Overview
Problem
Current pushable fibered coils used for occluding fluid flow in body vessels have high initial tension, leading to reformation back to their helical shape, requiring multiple coils for effective occlusion, and are difficult to deploy accurately due to short length and high resistance when advanced through catheters.
Innovation Solution
A coil member with low initial tension, designed to resist reformation and extend in length, facilitating accurate deployment and minimizing the need for multiple coils, with fibers spaced apart to avoid resistance during catheter loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high tension coils are used to wedge fibers to the coils, then fibers can be attached to the coils, but the coils tend to reform back to their helical shape creating openings for fluid flow
Solution Approach 1:
The patent changes the tension parameter of the coil from high (60-100 weight grams) to low (less than 60 weight grams, preferably 5-30 weight grams). This parameter change allows the coil to maintain fiber attachment while preventing reformation to helical shape, thereby maintaining occlusion effectiveness without requiring additional coils.
2Reliability
If multiple coils are packed within each other to occlude fluid flow, then effective occlusion is achieved, but additional time and costs are incurred
Solution Approach 1:
The patent combines multiple functions into a single coil device: the coil provides both the occlusion structure and the fiber attachment mechanism. By integrating these functions and using low tension to prevent reformation, a single coil can achieve effective occlusion that previously required multiple coils, thereby reducing procedural time and cost.
3Ease of operation
If pushable fibered coils are made short for deployment, then they can be advanced through catheters, but deployment accuracy is difficult to control
Solution Approach 1:
The patent makes the coil dynamic by allowing it to change shape from a compact deployed form to an extended configuration. The low tension coil can be pushed through the catheter in a compact form for ease of advancement, then deployed and extended at the target location to improve deployment accuracy and control.
4Shape
If fibers are packed along the length of the coil, then the coil structure is maintained, but the coil has enlarged diameter creating resistance during catheter loading
Solution Approach 1:
The patent applies preliminary action by compressing or folding the coil with attached fibers into a compact configuration before catheter loading. The low tension of the coil allows it to be compressed without damaging the fiber attachment, and it can be loaded into the catheter in this compact form, then deployed in its functional configuration at the target site.
Data Source
AI summary
An occluding device for occluding fluid flow through a lumen of a body vessel. The device comprises a coil and fibers attached to the coil. The coil has about 5 to 60 grams of initial tension to facilitate the coil to fold when deployed. The fibers extend from the coil at a length.