Breathing Assistance Apparatus with Automatic Circuit Drying
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Solution Overview
Problem
Existing breathing assistance systems face challenges in delivering humidified gases at optimal temperature and humidity levels, leading to dehydration and inflammation of airways, and there is a risk of pathogen transmission due to condensation and moisture retention in the breathing circuit.
Innovation Solution
A breathing assistance apparatus with a controller that adjusts gas flow and temperature settings, includes a drying cycle to prevent condensation and pathogen transmission, using sensors and heaters to maintain optimal conditions and ensure thorough drying of the conduit and patient interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heated water bath humidifiers are used to deliver high levels of humidity at high flow rates, then upper airway mucosal drying is prevented, but device complexity and energy consumption increase
Solution Approach 1:
The humidifier is divided into separate functional modules: a water reservoir, a heating element, a flow sensor, and a controller. This segmentation allows each component to be optimized independently and simplifies maintenance and cleaning procedures while maintaining reliable humidification performance.
Solution Approach 2:
The system performs preliminary heating of the water reservoir before delivering humidified gas to the patient. This ensures that the water is already at the optimal temperature for effective humidification when gas flow begins, preventing mucosal drying from the outset without requiring continuous high energy input.
2Reliability
If continuous gas flow is maintained to deliver adequate humidity, then airway hydration is sustained, but energy consumption and gas waste increase
Solution Approach 1:
The gas flow rate is dynamically adjusted based on real-time monitoring of patient breathing patterns, humidity levels in the circuit, and temperature sensors. The system increases flow during periods of high demand (such as during apneic events) and reduces flow during stable periods, maintaining airway hydration while minimizing energy consumption and gas waste.
Solution Approach 2:
The system incorporates sensors that continuously monitor humidity levels, temperature, and gas flow rate, feeding this information back to the controller. The controller automatically adjusts the heating element power and gas flow valve to maintain optimal humidification conditions with minimal energy input, preventing both over-humidification and energy waste.
3Reliability
If high flow rates are used to deliver sufficient humidity, then mucosal drying is prevented, but nasal resistance increases and treatment effectiveness decreases
Solution Approach 1:
The system optimizes the temperature and humidity parameters of the delivered gas to achieve effective mucosal hydration at lower flow rates. By precisely controlling the water temperature in the reservoir and the heating element power, the system generates gas with optimal saturation levels that reduce nasal resistance while still preventing mucosal drying.
Solution Approach 2:
The humidification system uses a composite approach combining heated water vapor with controlled gas flow, creating a synergistic effect where the warm, saturated gas delivers maximum humidification efficiency at reduced flow rates, thereby preventing the increase in nasal resistance associated with high flow rates alone.
4Ease of operation
If heating elements are used to maintain gas temperature, then gas delivery comfort is improved, but risk of overheating and pathogen transmission increases
Solution Approach 1:
The system performs preliminary heating of the water reservoir to a controlled temperature before gas flow begins, and uses temperature sensors to monitor the water temperature continuously. This preliminary action ensures the water is ready to provide gentle warmth without risking overheating of the delivered gas, maintaining patient comfort while preventing thermal damage or pathogen proliferation.
Solution Approach 2:
Temperature sensors positioned in the water reservoir and in the gas delivery pathway provide continuous feedback to the heating element controller. The system automatically modulates heating power to maintain gas temperature within a safe and comfortable range, preventing overheating that could cause tissue damage or create conditions favorable for pathogen transmission.
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
Delivers body temperature saturated gases at desired humidity and flow, minimizing airway dehydration and pathogen risk, while ensuring efficient drying of the breathing circuit to enhance patient comfort and safety.
Implementation Method 1
a humidifier having a chamber adapted to receive a volume of water and a chamber heater to heat said water in said chamber
Implementation Method 2
said transportation pathway means has a pathway heater
Implementation Method 3
using sensors and heaters to maintain optimal conditions
Implementation Method 4
includes a drying cycle to prevent condensation and pathogen transmission
Data Source
AI summary
A breathing assistance apparatus and method of controlling a breathing assistance apparatus is disclosed. Particularly, the breathing assistance apparatus is controlled such that it has a drying cycle to enable drying of the tubing that supplies gases to a user and prevent the harbouring of pathogens within the tube. The drying cycle is preferably operated automatically by internal controllers in the apparatus. However, it may be manually activated by pressing a button on the apparatus. The drying cycle is preferably activated at the end of a user's treatment session.