Disposable PEP Device Annular Chamber Airflow Oscillation
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Solution Overview
Problem
Existing PEP devices are complex, expensive, and prone to microbial contamination due to non-compliance with hygiene practices, necessitating a cost-effective, single-use solution that can produce cyclical fluctuations in airflow resistance for effective secretion mobilization during respiratory therapy.
Innovation Solution
A miniature, three-part disposable PEP device with an annular chamber and a moveable body that causes intermittent partial blocking of the outlet, creating cyclical fluctuations in airflow resistance, reducing manufacturing complexity and microbiological risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a fixed orifice resistor or threshold resistor is used to generate pre-set pressures, then positive exhalation pressure can be maintained, but the device becomes complex and expensive
Solution Approach 1:
The patent describes a disposable PEP device that is inexpensive to manufacture and intended for single use only. The device comprises a mouthpiece, a chamber with inlet and outlets, and a rotor with oscillating vanes. After one use, the entire device is discarded, eliminating the need for complex cleaning and sterilization procedures while maintaining effective PEP therapy delivery
Solution Approach 2:
The device is divided into distinct functional components: a mouthpiece for patient interface, a chamber for air flow and pressure generation, and a rotor assembly with oscillating vanes. This segmentation allows each component to be optimized for its specific function while keeping the overall construction simple and manufacturable
2Reliability
If a rotor with oscillating vanes is used to produce pressure oscillation, then secretion mobilisation is enhanced, but the device becomes complex and expensive
Solution Approach 1:
The rotor contains vanes that oscillate back and forth periodically as air flows through the chamber. This periodic motion creates pressure fluctuations and oscillations in the air stream, which enhance secretion mobilisation by preventing secretions from adhering to airway walls and facilitating their removal through coughing
Solution Approach 2:
The rotor is designed to oscillate automatically using only the kinetic energy of the patient's exhaled air flow. No external power source, motor, or compressed air supply is required - the air flow itself drives the vanes back and forth, providing the therapeutic oscillation effect while keeping the device simple and portable
3Stress or pressure
If a motor or compressed air is used to effect rotation of rotors, then pressure oscillation can be generated, but the device cost and regulatory challenges increase significantly
Solution Approach 1:
The patent replaces complex mechanical systems (motors, compressed air tanks, valves) with a simple passive mechanical oscillator. The rotor vanes are designed to be driven purely by the patient's exhaled air flow, converting the patient's own breath into the driving force for pressure oscillation. This eliminates all associated costs and regulatory hurdles of powered systems
4Adaptability or versatility
If multi-use PEP devices are used, then device functionality is maintained, but microbial contamination risk increases due to poor hygiene compliance
Solution Approach 1:
The device is designed as a single-use disposable unit that is inexpensive to manufacture. Each patient receives a new sterile device, and after one use, the entire device is discarded. This eliminates all risks of cross-contamination and eliminates the need for cleaning, sterilization, and maintenance procedures that are difficult to comply with in practice
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 is inexpensive, easy to manufacture, and effectively provides cyclical fluctuations in airflow resistance, enhancing secretion mobilization while minimizing microbial contamination risks, making it suitable for single-use applications.
Implementation Method 1
a moveable body (typically a metal ball) configured to revolve around the annular chamber in response to flow of air from the chamber inlet to the chamber outlet
Data Source
AI summary
A positive exhalation pressure device (1) is described. The device (1) comprises a housing (2) having an annular chamber (5), a chamber inlet (6) configured to permit air into the chamber, a chamber outlet (7) configured to permit air out of the chamber, and a mouthpiece (8) in fluid communication with the chamber inlet. A movable body such as a ball (3) is disposed in the housing within the annular chamber and configured to revolve around the annular chamber in response to flow of air through the chamber from the chamber inlet to the chamber outlet. The movable body is configured to at least partially block the chamber outlet as it revolves around the annular chamber causing cyclical fluctuations in airflow resistance.