Ventilatory Manifold with Internal Inspiratory Lumen for Dead Space Reduction
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Solution Overview
Problem
Current ventilatory assist systems face challenges in minimizing dead space in respiratory circuits, leading to inefficient CO2 removal and increased respiratory drive in patients with impaired respiratory function, particularly when using conventional endotracheal tubes.
Innovation Solution
A device and system that includes a manifold with an inspiratory lumen insertable within an endotracheal tube, a valve to control inspiratory flow, and a controller to adjust flow fractions based on tidal volume and physiological signals, reducing dead space and optimizing CO2 removal without requiring replacement of existing endotracheal tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional single lumen endotracheal tube is used, then the device complexity is low, but the dead space in the respiratory circuit increases and CO2 removal efficiency deteriorates
Solution Approach 1:
The endotracheal tube is divided into multiple lumens (first lumen for inspiration, second lumen for expiration) to enable separate unidirectional airflow paths. This segmentation eliminates dead space by preventing mixing of expired and inspired gases, thereby improving CO2 removal efficiency without significantly increasing device complexity
Solution Approach 2:
The inspiratory lumen is positioned concentrically within the expiratory lumen, creating a nested structure. This allows both lumens to coexist within the same tube assembly, achieving separate airflow paths while maintaining a compact single-tube configuration that does not substantially increase device complexity
2Productivity
If a multi-lumen tube is inserted into the trachea to reduce dead space, then CO2 removal efficiency is improved, but the risk of complications for the patient increases
Solution Approach 1:
A valve mechanism is incorporated to dynamically control the distribution of inspiratory flow between the first lumen and the second lumen. The valve can adjust the fraction of flow in each lumen based on patient needs, allowing optimization of CO2 removal while minimizing respiratory drive suppression and reducing potential complications
Solution Approach 2:
The system enables dynamic adjustment of flow fraction parameters to optimize patient outcomes. By controlling the fraction of inspiratory flow delivered through each lumen, the system can adapt to changing patient conditions, improving CO2 removal efficiency while maintaining patient safety and minimizing complications
3Productivity
If the fraction of inspiratory flow through the inspiratory lumen is increased to reduce dead space, then CO2 removal is enhanced, but the suppression of respiratory drive increases
Solution Approach 1:
The valve mechanism provides dynamic control over flow distribution, allowing the fraction of inspiratory flow through the inspiratory lumen to be adjusted in real-time. This enables optimization of CO2 removal while minimizing respiratory drive suppression by finding the optimal flow fraction balance
Solution Approach 2:
The system incorporates feedback control to monitor patient respiratory drive and adjust the flow fraction accordingly. By using physiological signals to guide flow distribution, the system can enhance CO2 removal while preventing excessive suppression of respiratory drive, thereby reducing harmful effects
Data Source
AI summary
A device for providing ventilatory assist to a patient has a manifold having an inspiratory port to receive an inspiratory flow from an inspiratory supply line, an interface port connectable to an external end of an endotracheal tube inserted in a patient's trachea and an expiratory port configured to receive an expiratory flow from the endotracheal tube via the interface port. An inspiratory lumen has a distal end insertable in the endotracheal tube. A cross-section of the inspiratory lumen is smaller than that of the endotracheal tube to allow gas flowing in the endotracheal tube. The inspiratory flow is directed to the inspiratory lumen, or to the endotracheal tube, or at once to the inspiratory lumen and to the endotracheal tube.