Collapsible Tracheostomy Valve Resolving Adhesion
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Solution Overview
Problem
Tracheostomy speaking valves require significant effort to open and close due to mucus contamination, leading to discomfort and increased inhalation force, especially when the flexible diaphragm adheres to the fixed surface, making it difficult for tracheotomized individuals to speak comfortably.
Innovation Solution
A tracheostomy tube valve with a hollow cylindrical body featuring circumferentially spaced longitudinal ribs and a disc that moves minimally to seal and unseal, allowing for unrestricted airflow, reducing the force required for inhalation and exhalation, and preventing exhaled air from passing through the tracheostomy tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible diaphragm is used to seal against a fixed surface, then the valve can prevent exhaled air from exiting through the tracheostomy tube, but the valve requires significant force to open and close due to mucus contamination and adhesion
Solution Approach 1:
The patent inverts the traditional valve design by making the valve body flexible and collapsible rather than rigid, while the sealing surface remains fixed. During inhalation, the flexible valve body collapses inward to open the airway with minimal force. During exhalation, the fixed sealing surface prevents backflow while the flexible body naturally returns to its original shape. This inversion resolves the contradiction by allowing reliable sealing without requiring significant force to operate the valve.
Solution Approach 2:
The patent employs a dynamic, collapsible valve body that changes shape and volume in response to pressure differentials during breathing. The flexible material allows the valve to dynamically transition between open and closed states without mechanical actuators or complex mechanisms. This dynamic behavior enables the valve to seal effectively during exhalation while requiring minimal force to open during inhalation, resolving the contradiction between sealing reliability and ease of operation.
2Device complexity
If the disc-shaped diaphragm is attached to the valve housing through its center or along one edge, then the valve structure is simplified, but the diaphragm becomes tacky and adheres to the fixed surface during exhalation, increasing the force required for subsequent operations
Solution Approach 1:
Instead of attaching a fixed diaphragm to a collapsible valve body, the patent inverts the design by making the valve body itself flexible and collapsible while the sealing surface remains fixed. This eliminates the adhesion problem entirely because there is no separate diaphragm that can become tacky and stick to the sealing surface. The flexible valve body opens during inhalation without requiring force to overcome adhesion, resolving the contradiction between structural simplicity and ease of operation.
Solution Approach 2:
The patent extracts the problematic diaphragm component from the traditional valve design. By eliminating the separate diaphragm that attaches to the valve housing, the design removes the source of adhesion and tackiness issues. The sealing function is achieved through the fixed sealing surface and the natural collapse of the flexible valve body, rather than through a adhering diaphragm. This extraction resolves the contradiction by maintaining structural simplicity while eliminating the adhesion problem that increases operational force.
3Ease of operation
If a ball valve is placed within the tracheostomy tube to restrict airflow, then the valve can control air flow direction, but it creates discomfort and exhausts the patient due to restricted airflow
Solution Approach 1:
The patent uses a dynamic, collapsible valve body that automatically adjusts airflow based on breathing phase. During inhalation, the valve body collapses inward to create a wide open passage, allowing unrestricted airflow. During exhalation, the valve body returns to its original shape to seal against the fixed surface, directing exhaled air through the larynx. This dynamic behavior provides effective airflow control without creating the discomfort associated with rigid ball valves that restrict airflow during both inhalation and exhalation.
Solution Approach 2:
The patent segments the breathing cycle into inhalation and exhalation phases, with the valve body collapsing during inhalation to allow unrestricted airflow and sealing during exhalation to direct air through the larynx. This temporal segmentation allows the valve to provide directional control only when needed (during exhalation) while maintaining open airflow during inhalation, resolving the contradiction between airflow control and patient comfort.
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 solution minimizes the force needed to operate the valve, reducing patient effort and discomfort, while ensuring effective air flow and improved speech quality by diverting exhaled air through the larynx, thus enhancing speaking comfort and efficiency.
Implementation Method 1
When the patient exhales, due to the unrestricted air flow, minimum force is required to move the disc against the seating means to seal the opening... and when the patient inhales, the disc is moved away from the seating means
Data Source
AI summary
A tracheostomy tube speaking valve is disclosed. The tracheostomy tube speaking valve includes a cylindrical body with a passageway for air to pass through. A valve disc is provided in the passageway. The disc is moveable to allow for inhalation through the passageway and will close automatically in response to exhalation pressure to direct air to the patient's larynx and mouth for speech.