NIMV Control System for Automated Ventilator Flow Adjustment
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Solution Overview
Problem
Ventilators using continuous positive airway pressure (CPAP) require manual adjustments and can be challenging for neonates to breathe against, as they lack automated control for inspiratory and expiratory phases.
Innovation Solution
A nasal intermittent mandatory ventilation (NIMV) control system that automatically adjusts inspiratory and expiratory flows using a combination of controllers, valves, and sensors to maintain controlled airway pressures without manual intervention, incorporating a pressure reference generator and internal estimators to estimate patient airway pressure and airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CPAP is used to facilitate breathing, then airway pressure is maintained, but manual adjustments are required and it is difficult for neonates to breathe against
Solution Approach 1:
The NIMV control system enables the ventilator to automatically adjust inspiratory and expiratory flows and airway pressures without requiring manual intervention. The system self-regulates by monitoring patient breathing patterns and autonomously modifying ventilation parameters to maintain optimal airway pressure and flow rates.
Solution Approach 2:
The system incorporates sensors that continuously monitor airway pressure, flow rates, and patient breathing efforts. This feedback is processed by the NIMV controller to dynamically adjust ventilation parameters, ensuring that airway pressure remains within target ranges while adapting to changing patient needs.
2Reliability
If CPAP is used to maintain airway pressure, then breathing is facilitated, but automated control for inspiratory and expiratory phases is lacking
Solution Approach 1:
The NIMV control system dynamically transitions between different ventilation phases (inspiration and expiration) based on real-time patient breathing patterns. The system automatically adjusts flow rates and airway pressures for each phase independently, providing phased automated control that adapts to the patient's respiratory cycle.
Solution Approach 2:
The ventilator autonomously manages the complete ventilation cycle including inspiratory flow generation, expiratory flow control, and airway pressure regulation without manual intervention. The NIMV controller self-regulates all ventilation parameters based on patient needs and system sensors.
3Adaptability or versatility
If manual adjustment of ventilator parameters is used, then flexibility is maintained, but the complexity of operation increases and response time is delayed
Solution Approach 1:
The system continuously monitors patient breathing parameters including flow rates, airway pressure, and breathing effort. This real-time feedback enables the NIMV controller to automatically detect changes in patient needs and immediately adjust ventilation parameters without waiting for manual intervention.
Solution Approach 2:
The ventilator autonomously detects patient breathing patterns and self-adjusts ventilation parameters including inspiratory flow, expiratory flow, and airway pressure. This eliminates the time delay associated with manual parameter adjustment while maintaining adaptability to changing patient conditions.
Data Source
AI summary
A ventilator including an inspiration flow control unit and an expiration flow control unit coupled to the inspiration flow control unit. The ventilator also includes a nasal intermittent mandatory ventilation (NIMV) control system coupled to the inspiration flow control unit and the expiration flow control unit. The NIMV control system is configured to automatically and simultaneously adjust an inspiration flow and an expiration flow. A pressure of the inspiration flow is increased from a baseline pressure to a control pressure. A pressure of the expiration flow is returned to the baseline pressure.