Y-Piece Demand-Flow Valve Control for Synchronized Ventilation
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Solution Overview
Problem
Existing ventilator systems fail to provide effective ventilatory assistance to patients with respiratory insufficiency or ARDS, leading to baro- and volutrauma, additional work of breathing, and patient-ventilator desynchronization due to inadequate detection of inspiratory and expiratory efforts and high resistance in endotracheal tubes.
Innovation Solution
A demand-flow valve located at the Y-piece in the airflow circuit, coupled with a flow sensor and pressure sensor, allows direct regulation of airway pressure and gas flow close to the patient, enabling precise control of tracheal, alveolar, or pleural pressure to compensate for tube resistance and synchronize with the patient's breathing pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure-controlled ventilation is used to support patients with respiratory insufficiency, then gas exchange is maintained, but baro- and volutrauma occur due to excessive inflation pressure
Solution Approach 1:
The system continuously measures actual airway pressure and flow using sensors, compares it with the commanded pressure, and adjusts the demand-flow valve in real-time to compensate for deviations. This closed-loop feedback control prevents excessive pressure delivery while maintaining adequate gas exchange, thereby avoiding baro- and volutrauma.
Solution Approach 2:
The system dynamically adjusts ventilation parameters including pressure support level, PEEP, and inspiratory flow based on real-time measurements of patient effort, lung compliance, and airway resistance. This allows optimization of ventilator settings to maintain gas exchange while minimizing harmful pressures.
2Ease of operation
If traditional ventilator systems with remote pressure control are used, then gas delivery is simplified, but patient-ventilator desynchronization occurs due to latency in detecting inspiratory efforts
Solution Approach 1:
The system separates the sensing function from the control function by placing flow and pressure sensors directly at the patient interface (Y-piece), while the control unit processes signals and adjusts the demand-flow valve locally. This segmentation reduces signal transmission latency and improves detection of patient inspiratory efforts.
Solution Approach 2:
The system continuously monitors flow and pressure parameters before patient-triggered inspiration occurs, enabling early detection of inspiratory effort. The control algorithm is prepared to immediately respond by adjusting the demand-flow valve, reducing the latency between patient effort and ventilator response.
3Productivity
If high pressure support is delivered to maintain gas exchange, then ventilation is sufficient, but additional work of breathing is imposed on the patient
Solution Approach 1:
The system measures actual flow and pressure to calculate the patient's work of breathing in real-time. Based on this feedback, the control algorithm adjusts the pressure support level and PEEP to maintain adequate ventilation while minimizing the work of breathing, preventing patient exhaustion.
Solution Approach 2:
The system delivers pressure support that is precisely matched to the patient's instantaneous inspiratory effort rather than providing fixed high pressure. This partial action approach provides sufficient ventilation support while avoiding excessive pressure that would increase work of breathing and cause patient fatigue.
4Ease of operation
If endotracheal tubes with standard resistance are used, then patient comfort is maintained, but tube resistance causes additional work of breathing and masks patient effort
Solution Approach 1:
The system continuously measures flow and pressure across the endotracheal tube to calculate the pressure drop caused by tube resistance. This feedback is used to compensate for the resistance effect, allowing the ventilator to deliver appropriate pressure support that overcomes tube resistance without requiring higher overall pressure, thereby maintaining patient comfort while reducing work of breathing.
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
The solution reduces latency and improves ventilation efficiency by minimizing additional work of breathing and desynchronization, allowing patients to breathe spontaneously with reduced lung damage and improved gas exchange.
Implementation Method 1
a flow sensor for measuring a gas flow in an airway to and from the patient
Implementation Method 2
a pressure sensor for measuring the airway pressure
Implementation Method 3
a demand-flow valve which is located in the airflow circuit at a Y-piece that connects a tube for the inspiratory and a tube for the expiratory flow circuit to the patient
Data Source
AI summary
The invention describes a method device (1) for providing ventilatory assistance to a patient, comprising a set of tubes (30, 40, 50, 60, 70) for gas flow (fl) to and from the patient, a demand-flow valve (81, 81′), a flow sensor (86), and a pressure sensor (87, 88) for measuring the airway pressure. That demand-flow valve (81, 81′) is located at a Y-piece (8Y) that connects a tube (30) for the inspiratory and a tube (40) for the expiratory flow circuit to the patient. The invention further describes a method a demand-flow valve (81, 81′) which can be used for such a device (1) and to a method for controlling such a device (1).