Flexible-Membrane Tracheostomy Valve for Quiet Airflow Control
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Solution Overview
Problem
Existing tracheostomy valves do not efficiently regulate airflow, leading to noise and inefficiency during exhalation and inhalation, which affects speech clarity and comfort for patients.
Innovation Solution
A tracheostomy valve with a flexible membrane that is pre-bent to create a preload, allowing for controlled and noiseless opening and closing movements, optimizing airflow by bending in a single plane with a curved inner surface to minimize resistance and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the membrane is made flat and rigid, then the valve structure is simple, but the valve opens slowly and creates noise during inhalation
Solution Approach 1:
The membrane is given a pre-bent curved shape with a radius of curvature R1 that is smaller than the radius R2 of the cap's inner surface. This curvature allows the membrane to flex and open rapidly during inhalation by following the curved path of the cap surface, eliminating the noise problem while maintaining structural simplicity.
Solution Approach 2:
The membrane is pre-bent during manufacturing to have an initial curvature that predisposes it to open quickly when pressure differential occurs. This preliminary shaping ensures the membrane follows a controlled curved path during operation, achieving fast opening without requiring complex mechanical mechanisms.
2Reliability
If the membrane is preloaded to seal positively, then the seal during exhalation is improved, but the membrane creates resistance and noise when opening
Solution Approach 1:
The pre-bent membrane with radius of curvature R1 < R2 creates a preload that ensures positive sealing during exhalation. The curved geometry allows the membrane to maintain contact with the cap surface while providing a defined flexing path that reduces opening resistance and eliminates noise during inhalation.
Solution Approach 2:
The invention changes the geometric parameters of the membrane by introducing a specific radius of curvature R1 that is smaller than the cap's radius R2. This parameter change optimizes both the sealing force during exhalation and the opening characteristics during inhalation, reducing noise and resistance.
3Speed
If the membrane opening path is unrestricted, then the opening is fast, but the membrane moves irregularly and creates noise
Solution Approach 1:
The pre-bent membrane follows a defined curved path with radius R1 as it opens during inhalation. This curved trajectory is predetermined by the manufacturing process and guides the membrane smoothly along the cap's inner surface, ensuring fast opening while eliminating irregular movements and noise.
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
The valve ensures rapid, noiseless, and efficient airflow regulation, enhancing speech clarity and patient comfort by minimizing pressure drop and noise during inhalation and exhalation.
Implementation Method 1
a flexible membrane (7) placed at an inner end (4a) of the cap and between an inner surface (5) of the cap and an outer end (1b) of the valve body
Implementation Method 2
such that the membrane gets a certain preload/bias/prestress and a pre-defined start of its movement by being opened in two segments, whereby a lower pressure drop or less resistance against opening is achieved
Data Source
AI summary
The present invention relates to a tracheostomy valve configured to be in fluid communication with a patient's trachea. The valve comprising a hollow valve body, a flexible membrane adapted to work as a check valve opening the valve when the patient inhales and sealingly closing the valve when the patient exhales, and a cap with at least one through hole making the cap fenestrated. The hollow valve body having a through hole forming a passageway for fluid extending between an inner end being an outlet of the hollow valve body and an outer end being an inlet of the hollow valve body. The fenestrated cap being configured to be detachably attached to the outer valve body end, and the inner valve body end is configured to be in fluid communication with the patient's trachea.