Microthin Polyurethane Cuff for Pediatric Tracheal Sealing
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Solution Overview
Problem
Conventional tracheal ventilation devices with cuffed pediatric tubes pose risks of trauma due to high-pressure cuff expansion, which can lead to vascular supply interruption, tissue degeneration, and severe complications, especially in newborns and children, as existing materials like PVC, latex, and silicone are unsuitable for creating atraumatic, low-pressure cuff balloons with the necessary geometry and wall thickness.
Innovation Solution
A tracheal tube with a cuff balloon made of microthin polyurethane or polyurethane compounds, featuring a specific wall thickness and geometric configuration, positioned to seal the trachea at the transition from the distal to medial third, allowing for low-pressure filling (5-15 mbar) that avoids tissue damage and ensures a reliable air seal, even under ventilatory pressures exceeding cuff filling pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials (PVC, latex, silicone) are used for cuff balloons, then the cuff can be manufactured with adequate strength, but the wall thickness cannot be reduced sufficiently to achieve atraumatic low-pressure sealing in pediatric patients
Solution Approach 1:
The patent uses polyurethane as a composite material that combines the necessary mechanical strength with the ability to be manufactured at extremely thin wall thicknesses (5-15 mbar pressure resistance). This material allows the cuff to maintain structural integrity while achieving the microthin walls necessary for atraumatic pediatric intubation, resolving the contradiction between strength and thinness.
Solution Approach 2:
The patent changes the material parameter from conventional PVC/latex/silicone to polyurethane, which has different mechanical properties allowing for thinner walls while maintaining sufficient strength. This parameter change enables the cuff to achieve both adequate strength and the reduced wall thickness necessary for low-pressure atraumatic sealing in pediatric patients.
2Ease of operation
If the cuff balloon diameter in the freely deployed state is smaller than the trachea diameter (low-volume/high-pressure cuff), then the cuff can be inserted easily, but high expansion pressures are required to seal the trachea causing tissue damage
Solution Approach 1:
The patent uses a microthin-walled polyurethane cuff (wall thickness enabling 5-15 mbar operation) that can be easily inserted in a collapsed state and then expands at very low pressures to seal the trachea. The thin film structure allows the cuff to conform to the tracheal wall without requiring high expansion pressures, thus preventing tissue damage while maintaining ease of insertion.
Solution Approach 2:
The patent changes the pressure parameter from conventional high-pressure operation to ultra-low pressure (5-15 mbar) operation through the use of microthin walls. This parameter change allows the cuff to achieve both easy insertion (small deployed diameter) and atraumatic sealing (low expansion pressure) simultaneously.
3Object-affected harmful factors
If the cuff balloon diameter in the freely deployed state appreciably exceeds the trachea diameter (high-volume/low-pressure cuff), then low filling pressures can be used, but the cuff envelope must be folded in situ which complicates the device structure
Solution Approach 1:
The patent uses microthin polyurethane walls that allow the cuff to be deployed in a high-volume configuration (diameter exceeding trachea diameter) while maintaining flexibility for folding during insertion. The thin film structure naturally folds without requiring complex mechanical structures, achieving both low-pressure operation and manageable device complexity.
4Object-affected harmful factors
If the cuff wall is made very thin to reduce pressure on adjacent tissue, then the risk of focal evagination (herniation) increases under pressure load
Solution Approach 1:
The patent uses polyurethane as a composite material that provides the unique property of maintaining wall integrity at extremely thin thicknesses (5-15 mbar pressure resistance) without focal evagination. This material combines the thinness necessary for atraumatic operation with the structural reliability to prevent herniation under pressure load.
Solution Approach 2:
The patent changes the material parameter to polyurethane with specific mechanical properties that allow the wall thickness to be reduced to microthin dimensions while maintaining sufficient reliability. This parameter change enables the cuff to achieve both tissue perfusion maintenance (through thin walls) and structural integrity (preventing evagination).
Data Source
AI summary
Tracheal ventilation device, particularly a tracheal tube, which seals the trachea in a substantially air-tight manner. The device includes a cuff that blocks the trachea below the glottis and is traversed by a ventilation cannula. The cuff is larger in its filled, freely displaceable, unrestricted state than in its filled state positioned in the trachea. The cuff is of a flexible soft film material and lies against the trachea by means of its folds. The device is adapted to the morphology of a child's larynx and is available in finely graded sizes.