Micro-Humidifier Upstream Breathing Circuit Condensation
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Solution Overview
Problem
Current respiratory humidifiers in mechanical ventilation systems face challenges in maintaining consistent humidity levels, leading to condensation issues, increased energy consumption, and risks of ventilator-associated pneumonia due to their bulkiness and fixed humidification rates that fail to adapt to tidal volume fluctuations.
Innovation Solution
A micro-humidifier system connected upstream in the breathing circuit, featuring a small liquid chamber and vapor generator, which allows for precise control of humidity and temperature, reducing condensation and energy requirements by being positioned close to the patient, thus reacting quickly to tidal volume changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a typical respiratory humidifier is used with a mechanical ventilator, then the humidification chamber can be positioned away from the patient, but condensation occurs in the breathing circuit and temperature is lost, requiring additional heating elements that increase energy consumption and system complexity
Solution Approach 1:
The invention transitions from a bulk humidifier positioned away from the patient to a micro-humidifier positioned at the patient interface (endotracheal tube or mask). This spatial repositioning eliminates the long breathing circuit where temperature loss and condensation occur, fundamentally changing the system architecture from distributed to centralized at the patient level.
Solution Approach 2:
The invention changes the scale parameter from a large humidification chamber to a micro-scale humidifier with volume of 0.01-30 mL. This parameter change enables the device to be positioned close to the patient while maintaining effective humidification, thereby eliminating the need for additional heating elements in the breathing circuit.
2Adaptability or versatility
If a fixed humidification rate is used in a typical humidifier, then the device structure can be simple, but it cannot adapt to tidal volume fluctuations, leading to either insufficient humidity or condensation
Solution Approach 1:
The invention implements a variable humidification rate that dynamically adapts to tidal volume fluctuations. The control system receives tidal volume information from the ventilator and adjusts the humidification rate accordingly, transitioning from a static fixed-rate system to a dynamic adaptive system that prevents both insufficient humidification and condensation.
Solution Approach 2:
The invention incorporates a feedback control mechanism where the humidification rate is adjusted based on real-time tidal volume measurements. The control system continuously monitors tidal volume and modifies the humidification output to maintain optimal humidity levels, creating a closed-loop adaptive system.
3Quantity of substance
If a large humidification chamber is used, then sufficient water is available for humidification, but the device becomes bulky and heavy, requiring placement away from the patient
Solution Approach 1:
The invention fundamentally changes the volume parameter from a large chamber (typically several liters) to a micro-scale chamber (0.01-30 mL). This parameter change enables the humidifier to be lightweight and portable while maintaining adequate water supply for effective humidification through the micro-fluidic design and efficient vaporization process.
4Temperature
If additional heating elements are placed in the breathing circuit to maintain temperature, then temperature loss is reduced, but the system complexity and energy consumption increase
Solution Approach 1:
The invention extracts the heating function from the breathing circuit and consolidates it into the micro-humidifier positioned at the patient interface. By eliminating the long breathing circuit, the need for distributed heating elements is removed, simplifying the system while maintaining temperature through direct proximity to the patient.
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 micro-humidifier system effectively maintains consistent humidity, reduces the risk of pneumonia, decreases energy consumption, and minimizes microbial growth, providing improved control over inhaled air quality and reducing therapy complications and costs.
Implementation Method 1
a vapour generator operably-connected to the liquid chamber. When the micro-humidifier is operably-connected to a breathing circuit, the vapour from the vapour generator enters into the breathing circuit
Data Source
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AI summary
A micro-humidifier (200) for operably-connecting to a breathing circuit (250) contains a liquid feed (260), a liquid chamber (216) operably-connected to the liquid feed (260), and a vapour generator (202) operably-connected to the liquid chamber (216). The liquid chamber (216) has a volume of from about 0.01 mL to about 30 mL. The micro-humidifier (200) is operably-connected to and/or is designed to be operably-connected to a breathing circuit (250) upstream of the patient. When the micro-humidifier (200) is operably-connected to a breathing circuit (250), the vapour from the vapour generator (202) enters into the breathing circuit (250). A respiratory humidification system contains the breathing circuit (250) and the micro-humidifier (200) as described herein. The micro-humidifier (200) is operably-connected to the breathing circuit (250) upstream of the patient, and the vapour from the vapour generator (202) enters into the breathing circuit (250).