Tracheostomy Valve Conical Membrane Seal and Response
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Solution Overview
Problem
Existing tracheostomy valves fail to open immediately upon inhalation and close positively at the end of inhalation, leading to suboptimal airflow and noise during speech, which hinders clear communication.
Innovation Solution
A tracheostomy valve design featuring a valve body with a conical inner end, a beam, and a circular membrane supported by beams and ribs, ensuring a seamless and noiseless operation by preloading the membrane for an uninterrupted seal during exhalation and allowing full opening during inhalation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane is preloaded into engagement with the seating ring, then the seal during exhalation is improved, but the response time for opening during inhalation deteriorates
Solution Approach 1:
The membrane is preloaded into engagement with the seating ring during assembly, creating a pre-compressed state that ensures immediate sealing during exhalation. The conical surface geometry is designed to maintain this preliminary engagement while allowing rapid release upon pressure differential changes during inhalation.
2Reliability
If the membrane is tightly sealed during exhalation, then speech clarity is improved, but noise generation during valve operation increases
Solution Approach 1:
The conical surface geometry of the membrane and seating ring creates a tapered sealing interface that distributes contact pressure along the conical surface. This curved geometry allows the membrane to seal positively during exhalation while providing a gradual transition that reduces turbulent flow and noise generation during valve opening and closing.
3Reliability
If the valve remains closed during exhalation, then speech capability is improved, but airflow resistance increases
Solution Approach 1:
The valve design provides different flow characteristics in different operational states: during exhalation, the conical membrane creates a tight seal with minimal leakage to enable speech; during inhalation, the same conical geometry allows the membrane to open fully with minimal resistance, optimizing airflow to the lungs.
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 immediate and noiseless opening and closing, optimizing airflow and enabling clear speech by minimizing membrane wrinkles and noise, while maintaining a positive seal during exhalation.
Implementation Method 1
The conical surface of the membrane preloads the membrane into engagement with the seating ring intended to result in an uninterrupted positive seal between membrane and seating ring
Data Source
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AI summary
The invention relates to a tracheostomy valve comprising a valve body (1) having a first inner end (Ia), a second outer end (Ib), and a passageway extending between said ends (Ia, Ib) through the valve body allowing air to flow from and through said first end (Ia) to and through said second end (Ib). The body has a first beam (2a) located in the passageway transversely to the direction of the air flow through said passageway at the outer end and a transverse flexible membrane (7) located within the passageway on the outer surface of said beam (2a). The valve further comprises a cap (4) securable to the outer end (1b) of the valve having an opening with a size largely corresponding to the inner size of the passageway. The opening is defined by a circumferential rim (14). The cap is provided with a second beam (2b) located in parallel along said first beam (2a) and the membrane (7) is held between said first beam (2a) and said second beam (2b). The first beam (2a) and the second beam (2b) are provided with securing means (2, 17) for additionally securing said membrane (7) between said first beam (2a) and said second beam (2b). The rim is provided with a seating surface (5) facing inwardly for supporting the periphery of said membrane (7). The second beam is provided with ribs (13 a - f) extending from said second beam (2b) to said rim (14). The second beam (2b) forms a grid (4a) together with the ribs (13 a - f) and the rim (14). The membrane (7) is preloaded into a closed position towards said seating surface (5). The outer surface of said first beam (2a) is straight and planar. The inner surface of said second beam (2b) is straight and planar. The space between said first (2a) and said second beam (2b) preferably corresponds to the thickness of said membrane (7). The seating surface (5) on each side of said second beam (2b) preferably is progressively and increasingly offset inwardly from a plane along the inner side of said second beam from zero distance at a first end of said beam(2b) to reach a maximum distance, the seating surface (5) then being progressively and decreasingly offset outwardly to zero distance at said plane at the second end of said beam (2b), said seating surface further merging smoothly and continuously with the inner surfaces of said ribs (13a - f).