Flutter Valve Airway Device for Pressure Control
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Solution Overview
Problem
Existing airway pressure control devices, particularly those for patients with compromised lungs, face challenges in safely managing expiratory air pressure, as they often require excessive effort and may not effectively prevent unsafe pressure levels in inspiratory tubes, especially in volume control mode.
Innovation Solution
A positive pressure airway device with a central tube and separate passageways for inhalation and exhalation, featuring a valve system with a stopper-biasing spring that allows air to flow only when expiratory pressure exceeds a selected threshold, providing resistance and preventing unsafe pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If strictures or small orifices are used to produce positive expiratory pressures, then expiratory pressure is increased, but flow is compromised with increased friction requiring more work to exhale
Solution Approach 1:
The patent employs a dynamic flutter valve mechanism that oscillates between open and closed positions during exhalation. The valve responds to changing pressure conditions, opening when pressure exceeds the threshold and closing when it drops, creating a dynamic flow resistance system rather than a static stricture. This dynamic behavior reduces the work required to exhale while maintaining therapeutic pressure levels.
Solution Approach 2:
The invention changes the parameter of flow resistance from a fixed geometric constraint (stricture/orifice size) to a variable parameter controlled by the flutter valve's oscillation frequency and amplitude. By adjusting the valve's mechanical properties (spring constant, mass, damping), the effective resistance can be tuned to provide therapeutic pressure without excessive work requirements.
2Reliability
If known PEP devices are used to increase expiratory pressure, then alveolar expansion is improved, but the devices may not be used for normal in-and-out breathing
Solution Approach 1:
The flutter valve's dynamic oscillation characteristics allow the device to adapt to different breathing patterns. During normal breathing, the valve oscillates at lower amplitudes, permitting bidirectional flow. During therapeutic exhalation, the increased pressure drives larger oscillations that provide the necessary resistance for alveolar expansion, thus achieving both normal breathing functionality and therapeutic effectiveness.
Solution Approach 2:
The device is designed to perform multiple functions: it allows normal inhalation and exhalation when pressure is low, and provides therapeutic PEP resistance when exhalation pressure exceeds the valve's opening threshold. The single flutter valve mechanism universally handles both normal breathing and therapeutic ventilation requirements without needing separate devices.
3Measurement precision
If pressure control systems are used in ventilators, then flow is provided until a set pressure is detected, but pressure may rise above safe levels in volume control mode
Solution Approach 1:
The flutter valve is pre-configured with a spring constant and mass that determine its natural oscillation frequency and pressure threshold. This preliminary setup creates an inherent safety mechanism that automatically limits pressure buildup in the inspiratory tube by allowing oscillations to vent excess pressure before it reaches dangerous levels, preventing the harmful effect before it occurs.
Solution Approach 2:
The flutter valve provides continuous pressure feedback through its oscillation behavior. When pressure in the inspiratory tube rises, the increased force on the valve modifies its oscillation characteristics (frequency, amplitude), which in turn regulates the flow and prevents excessive pressure buildup. This passive feedback mechanism automatically maintains pressure within safe limits without requiring active control.
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 device reduces the physical effort required for lung expansion, ensures safe expiratory air pressure, and prevents excessive inspiratory pressure, enhancing patient safety and lung expansion in patients with compromised lung capacity.
Implementation Method 1
a stopper-biasing spring to maintain the stopper in a fixed and closed position unless the expiratory air pressure in the passageway is greater than a selected pressure
Implementation Method 2
a valve system with a stopper-biasing spring that allows air to flow only when expiratory pressure exceeds a selected threshold, providing resistance and preventing unsafe pressure levels
Data Source
AI summary
A positive pressure airway device for providing resistance in an air pathway for a patient exhaling. The device includes a central tube region, a inspiratory air passageway for passing air into the central tube region when a patient breathing through the device inhales, and an expiratory air passageway for passing air out of the central tube region when a patient breathing through the device exhales, A valve in the expiratory air passageway allows air to flow out only when a patient using the device exhales with an expiratory air pressure greater than a selected pressure, and includes a stopper and a coil spring with an interior portion that is free from any structure that would inhibit the “side-to-side” movement of the spring within the housing. The stopper has a cone-shaped air-stopping surface providing a valve angle that is different from the valve-seat angle so that either laminar or oscillating flow may be obtained.