Portable PEP Device Liquid Column Pressure Control
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Solution Overview
Problem
Current respiratory positive expiratory pressure (PEP) devices are expensive, fragile, complex, and pose hygiene and safety concerns, making them unsuitable for home use and compliance with health regulations.
Innovation Solution
A portable, one-piece PEP device with a container holding liquid, a fixed air inlet, and a one-way valve, featuring a graduated scale for setting pressure, easy cleaning, and secure design to prevent liquid aspiration and spillage, made from lightweight, easy-to-clean materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercially available oscillatory PEP devices are used, then effective PEP therapy is provided, but the device is too expensive, fragile and complicated for home use
Solution Approach 1:
The patent creates a simplified copy of the PEP therapy function using basic components (container, tubing, valve) rather than replicating the complex oscillatory mechanism. The core therapeutic function of providing positive expiratory pressure is copied using a much simpler water-column resistance system, making it suitable for home use while maintaining therapeutic effectiveness
Solution Approach 2:
The device uses inexpensive, easily replaceable components such as a simple container, disposable tubing, and a basic valve. These components can be easily replaced if contaminated or damaged, reducing the need for complex maintenance or repair of expensive parts, thereby making the device economically viable for home use
2Ease of manufacture
If bubble PEP devices made from bottles and tubing are used, then cost is reduced, but hygiene and safety concerns arise due to contamination risks
Solution Approach 1:
The device is divided into separable components (container, tubing, valve, mouthpiece) that can be individually cleaned, disinfected, or replaced. This segmentation allows each component to be properly sanitized according to its specific requirements, reducing contamination risks while maintaining the simple, low-cost structure of the overall device
Solution Approach 2:
The patent introduces a valve as an intermediary component between the patient's mouth and the water container. This valve acts as a barrier that prevents direct contact between the patient's respiratory system and the water reservoir, thereby reducing the risk of aspiration pneumonia and cross-contamination while maintaining the simple bubble PEP mechanism
3Ease of manufacture
If bubble PEP devices are used, then cost is reduced, but the equipment is awkward to use and not portable
Solution Approach 1:
The patent merges the container, tubing, valve, and mouthpiece into a single integrated assembly that functions as one portable unit. This unified design eliminates the need to handle multiple separate components, making the device easy to carry, set up, and use at home while maintaining the cost-effective bubble PEP mechanism
4Ease of manufacture
If bubble PEP devices are used, then cost is reduced, but the resistance produced is inconsistent
Solution Approach 1:
The patent uses the height of the water column as a controllable parameter to precisely adjust and standardize the resistance level. By marking the container at specific heights (e.g., 10cm, 15cm, 20cm), the device provides consistent and reproducible positive expiratory pressure levels, ensuring therapeutic reliability while maintaining the simple, low-cost design
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 provides consistent and safe PEP therapy, reducing contamination risks and enabling home use, while being cost-effective and easy to maintain, thus facilitating ongoing lung function improvement post-hospital discharge.
Implementation Method 1
the bottom of the conduit is below the predetermined level of liquid to provide a desired level of positive pressure
Data Source
AI summary
A device for providing positive expiratory pressure therapy to a patient wherein exhaled air is at a comparatively higher pressure than atmospheric pressure, said device including a container to hold liquid, an air inlet means to allow entry of air into the container and an air outlet to allow air to vent from the container. The air inlet means includes a conduit to discharge the exhaled air. The conduit is fixed in position so that the exhaled air is discharged at or substantially adjacent the base of the container. In use liquid is introduced into the container to a predetermined level and the bottom of the conduit is below the predetermined level of liquid to provide a desired level of positive pressure and the air outlet is above the predetermined level of liquid.