High Flow Therapy Device Non-Sealing Interface Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current respiratory gas delivery systems with non-sealing patient interfaces, such as nasal cannulas, face challenges in delivering high flow rates necessary for therapeutic effects similar to non-invasive ventilation systems, while avoiding irritation and bronchospasm, and lack effective monitoring of treatment parameters like pressure and carbon dioxide buildup.
Innovation Solution
A high flow therapy system incorporating a microprocessor, heating elements, and sensors to heat and deliver gas through a non-sealing respiratory interface, allowing for controlled delivery of high flow rates and monitoring of upper airway pressure, which includes a blower, air filter, and compressed gas control mechanism to ensure safe and effective treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non-sealing patient interface like a nasal cannula is used, then patient comfort and ease of application are improved, but the ability to generate and maintain positive airway pressure deteriorates due to gas loss to atmosphere
Solution Approach 1:
The system changes the flow rate parameter from low/continuous to high/controlled, delivering gas at sufficiently high flows (e.g., 30-60 L/min) to generate and maintain positive pressure in the patient's airway despite the non-sealing interface. This parameter change enables the use of non-sealing interfaces while achieving therapeutic pressure effects.
2Reliability
If high flow rates are delivered through a non-sealing interface, then therapeutic effects similar to NIV systems are achieved, but gas loss to atmosphere increases
Solution Approach 1:
The system incorporates sensors to monitor treatment parameters including pressure, flow rate, and carbon dioxide buildup in the patient's upper airway. This feedback enables the microprocessor to adjust and optimize gas delivery, ensuring therapeutic effectiveness while minimizing unnecessary gas loss by delivering precisely the required flow rates.
Solution Approach 2:
The system delivers gas at controlled high flow rates (e.g., 30-60 L/min) which is sufficient to generate positive pressure and achieve therapeutic effects without excessive gas loss. The high flow rate parameter enables effective treatment through non-sealing interfaces while the controlled delivery optimizes gas utilization.
3Reliability
If high concentrations of oxygen are delivered at high flow rates, then therapeutic efficacy is improved, but irritation and bronchospasm may occur
Solution Approach 1:
The system changes the temperature parameter by heating the delivered gas to body temperature or near body temperature. This temperature adjustment prevents irritation and bronchospasm that would otherwise occur from delivering cold high-concentration oxygen at high flow rates, while maintaining therapeutic efficacy.
Solution Approach 2:
The system performs preliminary heating and humidification of the gas before delivery to the patient. This preliminary action prepares the gas to be non-irritating and physiologically compatible, preventing harmful effects before they can occur during therapy.
4Measurement precision
If treatment parameters like pressure and carbon dioxide buildup are monitored, then treatment control and efficacy assessment are improved, but device complexity increases
Solution Approach 1:
The system uses a single microprocessor to perform multiple functions including controlling gas delivery, heating, humidification, and monitoring treatment parameters. This multi-functionality approach enables comprehensive parameter monitoring and control without proportionally increasing device complexity, as one intelligent controller handles all tasks.
Solution Approach 2:
The system incorporates sensors that provide feedback on pressure, flow rate, and carbon dioxide buildup to the microprocessor. This feedback mechanism enables automated monitoring and adjustment of treatment parameters, improving measurement precision while the microprocessor manages the complexity of processing and responding to multiple sensor inputs.
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 enables the delivery of high flow rates of heated and humidified gases, minimizing respiratory infections and effectively treating conditions like sleep apnea and snoring by maintaining optimal airway pressures and gas composition, improving patient comfort and treatment efficacy.
Implementation Method 1
heating elements, and sensors to heat and deliver gas
Implementation Method 2
deliver gas at high flows that are high enough to generate positive pressure in the patient's airway
Implementation Method 3
a sensor configured to measure pressure in the upper airway of the patient
Implementation Method 4
delivery of high flow rates of heated and humidified gases
Data Source
AI summary
A high flow therapy system for delivering heated and humidified respiratory gas to an airway of a patient, the system including a respiratory gas flow pathway for delivering the respiratory gas to the airway of the patient by way of a non-sealing respiratory interface; wherein flow rate of the pressurized respiratory gas is controlled by a microprocessor.