Lung Ventilator Continuous Inspiratory Flow ARDS Management
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Solution Overview
Problem
Current ventilation methods, particularly for patients with Acute Respiratory Distress Syndrome (ARDS), are inadequate as they can lead to high mortality rates, chronic lung damage, and complications such as barotrauma, volutrauma, and atelectrauma.
Innovation Solution
A lung ventilator system and method that utilize a dual lumen tube with continuous inspiratory flow and periodic concurrent expiratory flows, regulated by pressure setpoints and ETCO2 sensors, to maintain optimal lung inflation and CO2 elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ARDSnet style ventilation is used, then standard mechanical ventilation is provided, but it creates a compounding tamponade effect on pulmonary vasculature and does not show benefit
Solution Approach 1:
The patent divides the ventilation process into separate inspiratory and expiratory phases with distinct control mechanisms. The inspiratory flow is maintained at a constant rate throughout inspiration, while expiration is allowed to occur naturally or be assisted, creating segmented control that avoids the continuous high-pressure exposure of traditional ventilation methods.
Solution Approach 2:
The patent changes the flow parameter from variable (traditional tidal ventilation) to constant (uniform inspiratory flow rate). This parameter change ensures that gas is delivered at a steady rate regardless of pressure fluctuations, preventing the tamponade effect while maintaining effective ventilation.
2Reliability
If high frequency oscillating ventilation (HFOV) or airway pressure release ventilation (APRV) is used, then aggressive therapy is provided, but negative sequelae occur and mortality rate remains high
Solution Approach 1:
The patent inverts the traditional approach by maintaining constant inspiratory flow rather than allowing flow to vary with pressure changes. This inversion prevents the harmful effects of pressure surges while ensuring adequate gas delivery, achieving effective ventilation without aggressive therapy-related complications.
Solution Approach 2:
The patent ensures continuous constant flow delivery during the entire inspiratory phase, eliminating interruptions or fluctuations that could cause lung injury. This continuous useful action maintains alveolar recruitment without the harmful peaks and valleys of traditional ventilation cycles.
3Ease of operation
If conventional ventilation with variable flow is used, then standard ventilation is provided, but it causes barotrauma, volutrauma, and atelectrauma
Solution Approach 1:
The patent changes the flow parameter from variable to constant, delivering gas at a uniform rate throughout inspiration. This parameter change eliminates the pressure spikes that cause barotrauma and the volume overstretching that causes volutrauma, while the controlled constant flow prevents atelectrauma by maintaining steady alveolar expansion.
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
This approach reduces the risk of ventilator-induced lung injuries, maintains lung recruitment, and achieves normal CO2 levels, thereby improving patient outcomes and reducing mortality rates.
Implementation Method 1
An ETCO2 sensor may be disposed within the expiratory line
Implementation Method 2
An inspiratory control valve may be operable for adjusting a rate of inspiratory airflow through the inspiratory line to a patient lung
Implementation Method 3
An expiratory control valve may be operable for adjusting a rate of expiratory airflow through the expiratory line away from the patient lung
Implementation Method 4
a lung pressure measuring device coupled with the expiratory line
Data Source
AI summary
A method of, or system for, ventilating lungs in breathing and non-breathing patients—including applications for anesthesia—may comprise maintaining an inspiratory flow rate at an inspiratory setpoint at a low flow setting. Lung pressure in a patient may be regulated between a high pressure setpoint and a low pressure setpoint with periodic expiratory flows and continuous inspiratory flow. An expiratory control valve may be adjusted to an open position when a lung pressure is at or above a high pressure setpoint. An expiratory control valve may be adjusted to a closed position when a lung pressure is at or below a low pressure setpoint. Concurrent venting outflow and CO2 offloading through flow within the lungs may be facilitated by providing an intermittent expiratory flow to the patient while providing the continuous inspiratory flow.