Respiratory Humidifier Capillary Vaporization
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Solution Overview
Problem
Typical respiratory humidification systems face issues with condensation in tubing, slow dynamic response times, and inefficiencies in maintaining high relative humidity, especially at high air flow rates, leading to frequent water reservoir refills and poor performance with mineral-laden water.
Innovation Solution
A respiratory humidification system utilizing a heated capillary passage with a pumping unit and filter to deliver pressurized water, forming an aerosol stream that is combined with an air stream to achieve up to 100% relative humidity, with a controller for continuous operation and a water recirculation arrangement to minimize condensation and adapt to flow rate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional humidification system is used, then the system structure is simple, but condensation occurs in tubing and the system cannot maintain high relative humidity at high air flow rates
Solution Approach 1:
The patent utilizes phase transition of water from liquid to vapor through a heated capillary passage. Water is supplied to the capillary passage and rapidly vaporized when heated, generating an aerosol stream that is combined with the air stream to achieve high relative humidity (up to 100%) even at high air flow rates, thereby resolving the contradiction between maintaining humidification performance and system complexity
Solution Approach 2:
The system changes the temperature parameter by heating the capillary passage to a specific operating temperature (120°C to 130°C). This temperature parameter change enables rapid vaporization of water, allowing the system to maintain high relative humidity at high air flow rates without requiring complex system architecture
2Productivity
If the air flow rate is increased to meet respiratory demands, then the productivity is improved, but the ability to maintain high relative humidity decreases
Solution Approach 1:
The heated capillary passage rapidly vaporizes water through phase transition, generating a concentrated aerosol stream that can be effectively combined with high velocity air streams. This phase change mechanism enables the system to maintain high relative humidity even when air flow rates are increased to meet respiratory demands
Solution Approach 2:
Water is pre-heated and vaporized in the capillary passage before being introduced to the main air stream. This preliminary vaporization action ensures that the humidification is already established, allowing the system to maintain high relative humidity even at high air flow rates where direct humidification would be insufficient
3Ease of operation
If mineral-laden water is used in the system, then the ease of operation is improved, but mineral deposits accumulate in the capillary passage
Solution Approach 1:
The capillary passage is coated with a fluorine-containing polymer, creating a composite structure that combines the thermal properties of the capillary material with the non-stick properties of the polymer coating. This composite structure allows the use of mineral-laden water while preventing mineral deposits from adhering to the capillary passage surface, maintaining system reliability
Solution Approach 2:
The fluorine-containing polymer coating on the capillary passage converts the potentially harmful effect of mineral-laden water into a beneficial situation. The coating's non-stick properties prevent mineral deposits from accumulating, allowing the system to operate with ordinary water supplies without compromising performance
4Speed
If the system is designed for rapid response to humidity changes, then the speed is improved, but the dynamic response time increases due to condensation and refilling requirements
Solution Approach 1:
The rapid phase transition of water to vapor in the heated capillary passage enables quick generation of humidified air. This phase change mechanism provides rapid response to humidity changes without the delays associated with condensation and refilling in traditional systems
Solution Approach 2:
The system maintains continuous operation with the pump running continuously and the capillary passage maintained in a heated condition. This continuous action eliminates interruptions for refilling and reduces dynamic response time, as the system is always ready to generate humidified air when needed
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 effectively maintains high relative humidity at high air flow rates with minimal condensation, rapid response to humidity changes, and flexibility in system design, while also handling mineral-laden water by using a fluorine-containing polymer coating to reduce mineral deposits.
Implementation Method 1
a heater arranged to heat the pressurized water in the capillary passage into at least a partially vaporized state
Implementation Method 2
a heater operable to at least partially vaporize water in the capillary passage
Implementation Method 3
the water upon heating is at least partially vaporized to form an aerosol stream
Implementation Method 4
the pressurized water in the capillary passage is heated to volatilize at least some of the pressurized water therein to form an aerosol stream
Implementation Method 5
using a fluorine-containing polymer coating to reduce mineral deposits
Data Source
Figure 1
Figure 2~3
Figure 4A~5
AI summary
A respiratory humidification system (10) having a capillary passage (52) in communication with a ventilator (80), the ventilator adapted to deliver an air stream, a heater operable to at least partially vaporize water in the capillary passage, a pumping unit (40) adapted to supply water to the capillary passage, wherein the water upon heating is at least partially vaporized to form an aerosol stream. The aerosol stream is combined with the air stream to form a humidified air stream.