Patient Interface With Integrated Venturi Jet Pump for Oxygen Delivery
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Solution Overview
Problem
Existing ventilation systems are not well suited for delivering supplemental oxygen from an oxygen concentrator due to pressure and flow requirements, leading to safety and calibration issues when using compressors.
Innovation Solution
A patient circuit with a nasal pillows style interface incorporating a Venturi effect jet pump, a three-way primary connector, and tri-lumen tubing, allowing for the delivery of supplemental oxygen directly to the patient while bypassing the compressor and ventilator, and enabling multiple configurations for oxygen delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the ventilator compressor is used to deliver supplemental oxygen, then the oxygen can be pressurized to required levels, but safety issues arise from pressurizing oxygen in a compressor designed for air
Solution Approach 1:
The system segments the gas delivery pathways by providing separate connectors: one for compressed air from the ventilator and another for supplemental oxygen from external sources. This allows oxygen to be delivered without passing through the compressor, eliminating safety concerns while maintaining the ability to pressurize air independently
Solution Approach 2:
The patient interface acts as an intermediary that receives both compressed air from the ventilator and supplemental oxygen from external sources, combining them at the patient level rather than mixing them in the compressor. This mediator approach allows safe integration of oxygen without compromising compressor safety
2Measurement precision
If the ventilator flow sensing calibration is used for oxygen delivery, then flow measurement is available, but calibration problems occur when delivering mixtures of oxygen and air
Solution Approach 1:
The flow measurement system is segmented into separate pathways: the ventilator's flow sensor measures only the compressed air component, while supplemental oxygen flow is measured separately or estimated. This segmentation prevents calibration errors that would occur if the sensor tried to measure mixed oxygen-air flows
Solution Approach 2:
The system uses feedback from the ventilator's flow sensor to monitor and adjust the compressed air delivery, while supplemental oxygen delivery is controlled independently. This feedback mechanism maintains accurate calibration for air delivery and allows safe addition of oxygen without compromising measurement accuracy
3Device complexity
If a single patient interface is used for both ventilator connection and oxygen delivery, then device complexity is reduced, but the interface must accommodate multiple pressure and flow requirements
Solution Approach 1:
The patient interface is designed with multi-functionality, incorporating both a ventilator connector for compressed air and an oxygen connector for supplemental oxygen delivery. This universal interface handles multiple gas sources and delivery modes without requiring separate devices, achieving versatility while maintaining relatively simple integration
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
Enables efficient delivery of supplemental oxygen from an oxygen concentrator without interfering with the ventilator's operation, avoiding safety issues and calibration problems, and allowing for flexible ventilation configurations.
Implementation Method 1
incorporates at least one 'Venturi effect' jet pump proximal to the patient
Data Source
AI summary
A patient circuit of a ventilation system, such as a non-invasive open ventilation system, wherein the patient circuit comprises a nasal pillows style patient interface that incorporates at least one “Venturi effect” jet pump proximal to the patient. The patient circuit further comprises a pair of uniquely configured 3-way connectors which, in cooperation with several uniquely configured tri-lumen tubing segments, facilitate the cooperative engagement of the patient interface to a ventilator of the ventilation system.