Biased-Open Speaking Valve with Ball Ramp Mechanism
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Solution Overview
Problem
Current unidirectional speaking valves for tracheotomy patients close 100% upon exhalation, preventing airflow during exhalation and making it difficult for patients on ventilators to use them safely, especially when coupled with a Humidity Moisture Exchanger, and requiring cuff deflation, which can be risky and uncomfortable.
Innovation Solution
A novel biased-open speaking valve design that allows some airflow during exhalation by using a ball and ramp mechanism within a cylindrical housing chamber, enabling airflow through the upper airway for speech production while accommodating a Humidity Moisture Exchanger and reducing the risk of airway closure, with adjustable features for safer introduction and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a unidirectional speaking valve closes 100% upon exhalation to redirect air through the upper airway, then speech production is improved, but the risk of airway closure increases and compatibility with ventilators is reduced
Solution Approach 1:
The valve transitions from a binary closed/open state to a variable sealing state. The occlusion member can partially occlude the airway passage, allowing controlled airflow during exhalation while still redirecting sufficient air through the upper airway for speech production. This parameter adjustment resolves the contradiction by enabling both speech functionality and reduced airway closure risk.
Solution Approach 2:
The valve employs a dynamic occlusion member that can move between different positions (fully closed, partially closed, fully open) based on patient needs and ventilator compatibility requirements. This dynamic capability allows the valve to adapt its sealing behavior, providing speech assistance when needed while maintaining ventilator compatibility when required, thus resolving the reliability concern.
2Ease of manufacture
If a unidirectional speaking valve closes 100% upon exhalation to enable speech, then phonation is improved, but compatibility with Humidity Moisture Exchangers is lost
Solution Approach 1:
The valve allows adjustment of the occlusion degree to accommodate HMEs. By reducing the sealing tightness from 100% closure to partial occlusion, the valve enables concurrent use with Humidity Moisture Exchangers while maintaining sufficient airflow redirection through the upper airway for speech production, thus resolving the adaptability issue.
Solution Approach 2:
The dynamic occlusion member enables the valve to switch between different operational modes: full sealing for speech assistance and reduced sealing for HME compatibility. This dynamic adaptability allows the same device to serve multiple functions, resolving the contradiction between phonation improvement and HME compatibility.
3Ease of manufacture
If a unidirectional speaking valve requires cuff deflation for use, then speech production is enabled, but patient comfort and safety are reduced
Solution Approach 1:
The valve's partial occlusion capability allows it to function with the cuff inflated, eliminating the need for cuff deflation. By adjusting the sealing parameter from complete closure to partial occlusion, the valve enables speech production while maintaining cuff inflation for patient comfort and safety, thus resolving the contradiction.
Data Source
AI summary
A speaking valve for management of a patient's airway comprising a body rotatably and removably attachable to a tracheotomy tube, the body having a first end communicable with the tracheotomy tube and a second end distal from the first end, an offset opening formed in the second end, a ramp disposed within the body, a ball having a diameter disposed within the chamber, the ball being adapted to be guided up and down the ramp and able to partially close the opening in the second end of the body, and the body and hence the chamber therein, at the option and control of the patient, wherein the ball is adapted to move up and down the ramp opening and partially closing the opening in the second end of the body and, as selected, exhalation by the patient proceeds through the patient's upper respiratory system and facilitates speaking by the patient.