Phase Dilution Demand Oxygen Regulator Adaptation
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Solution Overview
Problem
Existing supplemental oxygen delivery systems for altitude breathing struggle to adapt to variations in workload and inhalation profiles, leading to inefficiencies in oxygen delivery and potential dilution during inhalation cycles.
Innovation Solution
A breathing system incorporating a phased-dilution demand oxygen regulator (PDDOR) that provides 100% pure oxygen during an initial demand phase of inhalation, followed by ambient air supply when the oxygen demand decreases, thereby adapting to changes in workload and altitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous dilution mode is used to provide oxygen throughout the inhalation cycle, then oxygen delivery coverage is improved, but oxygen consumption increases significantly
Solution Approach 1:
The system uses periodic action by providing oxygen in pulses at the beginning of each inhalation cycle rather than continuously. The demand valve opens only when negative pressure is detected at the start of inhalation, delivering oxygen during the initial phase when lung oxygen saturation is most critical, then closes to conserve oxygen during the remainder of the breath cycle.
Solution Approach 2:
The system applies preliminary action by delivering oxygen at the very beginning of the inhalation cycle before the user actually needs it for gas exchange. The demand valve is triggered by negative pressure that occurs at the start of inhalation, ensuring oxygen is available in the breathing circuit before the user's lungs require supplementation.
2Device complexity
If pulse-dilution systems use a fixed pulse bolus volume, then device complexity is reduced, but adaptability to variations in workload and inhalation profiles deteriorates
Solution Approach 1:
The system implements dynamics by making the oxygen delivery volume variable rather than fixed. The demand valve adjusts the amount of oxygen delivered based on real-time detection of user inhalation characteristics, allowing the system to adapt to different workload levels, speech patterns, and inhalation profiles without requiring complex electronic controls.
Solution Approach 2:
The system uses self-service by allowing the user's own inhalation mechanics to control oxygen delivery. The negative pressure generated during natural inhalation automatically triggers the demand valve, eliminating the need for external sensors or electronic control systems while maintaining adaptability to individual breathing patterns.
3Manufacturing precision
If fixed pulse bolus volume is used in pulse-dilution systems, then manufacturing precision requirements are reduced, but oxygen delivery effectiveness during varying inhalation profiles deteriorates
Solution Approach 1:
The system implements feedback by using the user's inhalation-induced negative pressure as a trigger signal for oxygen delivery. This passive feedback mechanism ensures that oxygen is delivered in appropriate volumes corresponding to actual user needs, adapting automatically to variations in inhalation depth, speed, and pattern without requiring precision manufacturing of fixed-volume reservoirs.
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 PDDOR system reduces oxygen consumption while maintaining effective oxygen delivery, adapting to variations in workload and altitude, and providing better breathing coverage compared to conventional pulse or demand systems.
Implementation Method 1
When the user begins to inhale through the breathing mask, commencing an inhalation cycle, the negative pressure signals the PDDOR and opens the demand valve
Implementation Method 2
The PDDOR maintains sufficient CV pressure to keep the demand valve open and provide a pure oxygen supply to the breathing mask during an initial phase of the inhalation cycle
Implementation Method 3
When the CV pressure drops below a lower threshold pressure, the main valve closes, cutting off the pure oxygen supply via the demand valve... the dilution valve unblocks to provide ambient air to the breathing mask
Data Source
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AI summary
A personal breathing system incorporating a phased-dilution demand oxygen regulator (PDDOR) is disclosed. In embodiments, the breathing system includes a pressurized oxygen source and oronasal mask, a dilution valve for supplying ambient air and a demand valve for supplying pure oxygen. The PDDOR senses the mask pressure associated with the start of an inhalation cycle, maintaining pressure to the demand valve through an initial demand phase during which 100% pure oxygen is supplied through the demand valve. Control pressure within the PDDOR drops throughout the initial demand phase; when the pressure drops below a lower threshold the PDDOR main valve is closed, blocking the demand valve and cutting off the oxygen supply. Ambient air is provided to the mask via a dilution valve to preserve flow to the user.