Flow-Targeted Ventilation via Negative Pressure Inversion
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Solution Overview
Problem
Current mechanical ventilation methods, particularly positive pressure ventilation, can cause lung injury, impair gas exchange, and complicate patient recovery due to the use of inflated tracheal cuffs, leading to issues like ventilator-associated pneumonia and difficulty in weaning patients from mechanical ventilation.
Innovation Solution
An open system for flow-targeted ventilation that delivers a predetermined flow waveform synchronized with the patient's breathing cycle, reducing airway pressure and work of breathing, and integrating with existing devices to enhance patient comfort and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If positive pressure ventilation is used to deliver breaths to patients, then ventilation support can be provided, but airway pressure increases and work of breathing increases
Solution Approach 1:
The patent inverts the traditional positive pressure ventilation approach by using negative pressure to generate flow. Instead of delivering positive pressure breaths that increase airway pressure, the system applies negative pressure to the breathing circuit during the inspiratory phase, which generates flow through the patient's airway while maintaining lower airway pressures. This resolves the contradiction by achieving ventilation support without the harmful increase in airway pressure associated with conventional positive pressure ventilation.
Solution Approach 2:
The system dynamically changes pressure parameters throughout the respiratory cycle. During inspiration, negative pressure is applied to generate flow; during expiration, pressure returns to baseline or slightly positive levels. This temporal variation in pressure parameters allows the system to provide ventilation support during inspiration while minimizing airway pressure during expiration, thereby resolving the contradiction between providing ventilation and maintaining low airway pressure.
2Reliability
If positive pressure ventilation is applied to support breathing, then gas exchange can be maintained, but the patient's spontaneous breathing effort is lost
Solution Approach 1:
The system is dynamically synchronized to the patient's spontaneous breathing cycle. Sensors detect the patient's inspiratory effort and trigger negative pressure delivery only during the patient's spontaneous inspiratory phase. This dynamic adaptation allows the system to provide ventilatory support that complements rather than replaces spontaneous breathing, maintaining gas exchange while preserving the patient's breathing effort and control.
Solution Approach 2:
The system uses feedback from flow sensors and pressure transducers to detect the patient's spontaneous breathing cycle and adjust negative pressure delivery accordingly. The feedback mechanism ensures that ventilatory support is provided only when the patient is making spontaneous inspiratory effort, thereby maintaining gas exchange while preserving spontaneous breathing. The system can detect when the patient is breathing spontaneously and modulates support to match this effort.
3Productivity
If traditional positive pressure ventilation is used, then ventilation can be delivered, but lung injury may occur
Solution Approach 1:
The patent applies negative pressure instead of positive pressure to generate respiratory flow. By inverting the pressure approach, the system achieves effective ventilation delivery while avoiding the high airway pressures (20-30 cm H2O or greater) that cause barotrauma and lung injury in conventional positive pressure ventilation. The negative pressure mechanism inherently limits peak airway pressure exposure.
Solution Approach 2:
The system converts the potential harm of high positive pressure into benefit by using negative pressure to generate flow. The harmful effect of positive pressure-induced lung injury is transformed into a beneficial approach where negative pressure generates the necessary flow for ventilation while keeping airway pressures low and safe. This paradigm shift converts the harmful mechanism into a protective one.
4Use of energy by moving object
If flow-targeted ventilation synchronized to breathing cycle is implemented, then work of breathing is reduced, but system complexity increases
Solution Approach 1:
The system uses the patient's own spontaneous breathing effort to trigger and time the delivery of negative pressure support. Flow sensors detect the patient's inspiratory flow, and the system automatically synchronizes negative pressure delivery to match the patient's breathing cycle without requiring complex external control. This self-service approach reduces work of breathing while minimizing the need for complex control systems, as the patient's own breathing patterns drive the support delivery.
Data Source
AI summary
An open system provides breath-synchronized, flow-targeted ventilation to augment respiration by a self-breathing patient. A sensor detects a physical property of a patient's respiratory cycle. A processor monitors the sensor and controls a gas source to deliver oxygen-containing gas through a tube extending into the patient's airway with the flow rate varying over each respiratory cycle in a predetermined non-constant waveform synchronized with the respiratory cycle to augment the patient's spontaneous respiration. Gas is delivered at a flow rate sufficient to significantly mitigate the airway pressure the patient must generate during spontaneous breathing and thereby reduce the patient's work of breathing.