Dual-Diameter Pediatric Tracheal Cuff Balloon Design
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Solution Overview
Problem
Conventional pediatric endotracheal tubes with sealing cuff balloons often damage the vocal cords due to the balloon expanding within the vocal cord area, and adapting adult tubes for children is challenging, leading to unstable ventilation and complications during surgeries and intensive care.
Innovation Solution
An endotracheal tube with a balloon having two distinct diameters, where the upper diameter is within the vocal cord area and the lower diameter is below it, ensuring the balloon does not expand within the vocal cords, made from polymers like thermoplastic polyurethane with a thickness of 1-25 µm and an inflation pressure of 5-30 mmH2O, and attached to the tube using adhesive bonding or welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing cuff balloon is mounted on a pediatric endotracheal tube, then effective sealing and ventilation are achieved, but the balloon expands within the vocal cord area causing damage to the vocal cords
Solution Approach 1:
The balloon is divided into two distinct diameter sections: an upper portion with smaller diameter (1.1-1.5 times tube outer diameter) that fits within the vocal cord area without causing damage, and a lower portion with larger diameter (1.3-1.6 times tracheal diameter) that provides effective sealing in the trachea. This segmentation allows the balloon to perform sealing function while avoiding harmful expansion in the vocal cord region.
Solution Approach 2:
Different portions of the balloon are designed with different diameters to match the anatomical requirements of different regions: the upper portion has reduced diameter to accommodate the vocal cord area, while the lower portion has increased diameter to ensure proper sealing in the wider tracheal space. This local differentiation resolves the contradiction between sealing effectiveness and vocal cord protection.
2Ease of manufacture
If an adult endotracheal tube is adapted for use in children, then manufacturing flexibility is maintained, but the tube dimensions and balloon positioning cannot properly accommodate pediatric anatomy
Solution Approach 1:
The balloon is designed with variable diameter parameters along its length, transitioning from a smaller upper diameter suitable for pediatric vocal cord areas to a larger lower diameter for effective tracheal sealing. This parameter variation allows the single balloon structure to adapt to pediatric anatomy while maintaining manufacturing efficiency through a unified design approach.
3Object-affected harmful factors
If the balloon upper mounting point is positioned below the vocal cords, then vocal cord damage is avoided, but the balloon cannot be properly positioned within the vocal cord area for optimal sealing
Solution Approach 1:
The balloon's segmented diameter design allows the upper mounting point to be positioned above the vocal cords (within the area occupied by vocal cords) while the reduced upper diameter prevents harmful expansion. The segmentation enables the balloon to occupy the vocal cord area for optimal positioning and sealing stability without causing damage through controlled expansion.
Data Source
Figure 1~4
AI summary
The present disclosure describes an endotracheal tube for a child, the tube having a balloon mounted near the distal end of the tube. The tube has a ventilation lumen and an inflation line used to inflate the balloon. The balloon is mounted to the tube at a lower mounting point and an upper mounting point. The upper mounting point is above the level of the vocal cords. The balloon has a lower and upper diameter when inflated, and the upper diameter is from 1.1 to 1.5 times larger than the outer diameter of the tube.