Profiled Humidification Control for CPAP Water Volume Reduction
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Solution Overview
Problem
Conventional humidifiers for patient respiratory disorders like Obstructive Sleep Apnea are large and consume excessive water due to their design, which is not suitable for patients requiring lower levels of humidification, leading to inefficient use and unnecessary size and bulk.
Innovation Solution
A compact humidifier system with a selectively attachable and detachable unit that allows for patient-specific, programmable, or automated delivery profiles, reducing water volume and size by optimizing humidification based on ambient conditions and patient needs, featuring a controller with sensors and adjustable valves for efficient water use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional humidifiers are designed with large water reserves to treat severe cases, then high levels of continuous humidification are achieved, but the overall size and bulk of the device increases
Solution Approach 1:
The patent implements dynamic humidification control through profiled delivery that adjusts water flow rates based on treatment stage and patient needs. The system transitions from high humidification at treatment start to reduced levels later, allowing smaller water reserves (e.g., 150-300 mL instead of 600 mL) while maintaining adequate treatment effectiveness throughout the session.
Solution Approach 2:
The system changes the parameter of water flow rate over time through pre-programmed profiles. Different flow rates are delivered at different stages of the treatment session, optimizing humidification efficiency and reducing the total water volume required in the reservoir compared to constant high-level delivery.
2Quantity of substance
If conventional humidifiers supply continuous high-level humidification, then maximum humidity delivery is achieved, but water consumption increases
Solution Approach 1:
The patent employs periodic variation in humidification delivery through profiled water flow rates. Instead of continuous maximum delivery, the system varies flow rates according to pre-programmed profiles that match patient needs at different treatment stages, reducing total water consumption while maintaining therapeutic effectiveness.
Solution Approach 2:
The system delivers partial humidification at certain treatment stages rather than continuous maximum levels. After initial high humidification needs are met, reduced flow rates are sufficient to maintain comfort, optimizing water usage efficiency.
3Reliability
If conventional humidifiers are designed for worst-case scenarios, then severe dryness and leaks are treated, but the system becomes overkill for patients seeking only comfort improvement
Solution Approach 1:
The patent provides dynamic adaptability through multiple pre-programmed delivery profiles and real-time adjustment capabilities. Patients can select profiles matching their specific needs (e.g., comfort vs. therapeutic), allowing the system to adapt from severe case treatment to mild comfort improvement without requiring different devices.
Solution Approach 2:
The system achieves universality by incorporating multiple delivery profiles and adjustment ranges that cover both severe pathological cases and mild comfort needs. A single device serves multiple patient populations through programmable variations in water flow rates and delivery patterns.
4Productivity
If sensor arrays are added to maximize humidifier performance, then efficiency and rain-out prevention are improved, but device complexity and cost increase
Solution Approach 1:
The patent implements self-service through pre-programmed delivery profiles that automatically adjust water flow rates based on treatment stage and ambient conditions. The system uses built-in temperature and flow sensors with embedded logic to optimize humidification without requiring complex external sensor arrays or sophisticated control algorithms.
Solution Approach 2:
The system incorporates feedback mechanisms using temperature and flow sensors that monitor ambient conditions and delivery parameters. This feedback is processed through control logic that adjusts water flow rates to maintain optimal humidification efficiency and prevent rain-out, achieving high productivity without excessive complexity.
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 system provides efficient and comfortable humidification, reducing water consumption and device size, allowing for tailored therapy and minimizing 'rain-out' issues, making it suitable for patients needing lower humidification levels while maintaining comfort and reducing energy usage.
Implementation Method 1
A flow generator pressurizes a stream of breathable gas to a desired pressure level and delivers the breathable gas to a patient. A heated element in communication with a reservoir of water heats the water to a temperature sufficient to vaporize the water and mix the water vapor with the breathable gas.
Implementation Method 2
heats the water to a temperature sufficient to vaporize the water and mix the water vapor with the breathable gas
Implementation Method 3
A mixing chamber mixes the breathable gas and the water vapor together to form a stream of humidified breathable gas.
Implementation Method 4
A flow generator pressurizes a stream of breathable gas to a desired pressure level and delivers the breathable gas to a patient
Data Source
AI summary
A humidifying system is configured to humidify pressurized breathable gas. The humidifying system includes a housing configured to couple to a blower that is adapted to supply pressurized breathable gas to provide continuous positive airway pressure (CPAP) treatment to a patient. The humidifying system also includes a tub adapted to hold a volume of water and a heater element to heat the volume of water. A controller is configured to select a humidity profile from a plurality of humidity profiles based on ambient conditions that occurred during a previous treatment session. Each of the plurality of humidity profiles presets a respective target humidity level of the pressurized breathable gas for a respective treatment session.