Ventilator Airway Compensation via Tracheal Pressure Catheter
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Solution Overview
Problem
Current mechanical ventilators lack a method to accurately measure and compensate for the resistance changes in endotracheal tubes due to mucus buildup, which affects the delivery of medical gases, and cannot distinguish between obstructions in the tube and the patient's lungs, leading to inefficient respiratory support.
Innovation Solution
A tracheal pressure catheter is inserted into the endotracheal tube to measure pressure differences between the ventilator and patient ends, allowing the ventilator to calculate and compensate for endotracheal tube resistance, and monitor for obstructions by comparing resistive properties, enabling precise pressure and flow adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an endotracheal tube is used to provide a pneumatically sealed connection with the patient, then the efficiency of medical gas delivery is improved, but mucus buildup restricts the flow of medical gas through the tube over time
Solution Approach 1:
The system continuously monitors airway resistance and provides feedback to identify when mucus buildup occurs in the endotracheal tube. By detecting changes in resistance patterns, the system can trigger alerts to clinicians so they can perform suctioning or other interventions to clear the tube and restore proper gas flow.
Solution Approach 2:
The patent uses electrical sensing and resistance measurement techniques to detect mucus buildup, replacing the need for direct mechanical inspection of the tube. The system measures electrical or pressure-based resistance changes that indicate mucus presence, allowing indirect detection without physically examining the endotracheal tube.
2Difficulty of detecting and measuring
If total change in patient airway resistance is monitored, then obstruction detection is possible, but there is no indication whether the obstruction is in the endotracheal tube or in the patient's lungs
Solution Approach 1:
The system divides the airway resistance measurement into separate segments: endotracheal tube resistance and patient airway resistance. By measuring pressure drops at different locations (proximal and distal to the tube), the system can independently calculate the resistance contribution of the tube itself versus the patient's lungs, allowing identification of where the obstruction is located.
Solution Approach 2:
The patent introduces an intermediary measurement approach using pressure transducers and resistance calculation models that act as mediators between the ventilator and the airway. This intermediary system processes pressure and flow data to separate and identify the resistance components, providing information about obstruction location that would otherwise be unavailable.
3Device complexity
If basic models with fixed transfer functions are used for endotracheal tube resistance, then the device complexity is reduced, but the accuracy of airway resistance compensation is limited due to tube length modifications and mucus buildup
Solution Approach 1:
The system transitions from static, fixed transfer function models to dynamic resistance measurement that adapts to changing conditions. The system continuously measures actual airway resistance and adjusts compensation parameters in real-time, accounting for tube length variations and mucus buildup effects, thereby maintaining high accuracy despite changing physiological conditions.
Solution Approach 2:
The patent employs parameter change techniques by continuously monitoring and updating resistance values based on measured pressure drops and flow rates. Instead of using fixed model parameters, the system dynamically adjusts resistance compensation parameters to match actual patient conditions, improving accuracy while managing complexity through algorithmic adaptation rather than hardware complexity.
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 solution provides accurate compensation for endotracheal tube resistance, improves respiratory support by targeting and addressing obstructions within the tube or lungs, reducing the risk of improper treatment procedures and ensuring effective gas delivery.
Implementation Method 1
A tracheal pressure catheter is inserted into the endotracheal tube to measure pressure differences between the ventilator and patient ends
Implementation Method 2
A breath of medical gas is provided by the mechanical ventilator to the patient via a patient connection under a pressure that is sufficient to overcome the resistance of the patient's airway
Implementation Method 3
Mucus buildup restricts the flow of medical gas through the endotracheal tube such that the patient does not receive the projected flow of medical gas
Data Source
AI summary
A method for controlling a mechanical ventilator that is supplying medical gas to a patient via an endotracheal tube. A pressure is measured from a patient end of an endotracheal tube. The pressure at the patient end of the endotracheal tube is used to create an improved endotracheal tube resistance model such that the medical gas supplied by the mechanical ventilator may be compensated for the resistance of the endotracheal tube thereby providing increased control over the medical gas that is delivered to the patient's lungs. Additionally, if an obstruction in the patient's airway is detected, the location of the obstruction may be targeted such that the proper remedial treatment or procedure is selected by a clinician.