Bistable Ventilator Switching Valve for PEEP Retention
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Solution Overview
Problem
Disconnecting a breathing circuit in ventilated patients poses risks to staff safety from aerosol release and patient safety from loss of positive end-expiratory pressure (PEEP), with existing methods like clamping the endotracheal tube being potentially dangerous.
Innovation Solution
A bistable valve mechanism with three ports and an actuator that quickly transitions between configurations, ensuring fluid communication between specific ports to maintain a closed circuit during disconnection, preventing intermediate positions and minimizing aerosol release and PEEP loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamp is applied to the endotracheal tube to maintain PEEP during disconnection, then patient safety is improved, but life-threatening complications may occur if the patient makes an inspiratory effort
Solution Approach 1:
The patent introduces a third port as an intermediary connection point that allows the breathing circuit to remain connected to the patient's airway through the valve mechanism, rather than completely disconnecting. This intermediary connection maintains PEEP while allowing safe disconnection from the ventilator, eliminating the need for clamps that could cause complications during patient inspiratory efforts
Solution Approach 2:
The valve mechanism segments the breathing circuit into distinct pathways controlled by the movable valve core. The circuit is divided such that the patient connection remains isolated from the ventilator connection while maintaining pressure, allowing the clamp to be removed and the patient to breathe safely through the maintained PEEP in the disconnected circuit
2Adaptability or versatility
If the breathing circuit is disconnected to change ventilators or circuits, then adaptability is improved, but aerosols may be released into the room endangering staff safety
Solution Approach 1:
The valve acts as an intermediary device that enables circuit changes without direct atmospheric exposure. The third port serves as a transition point where circuits can be connected or disconnected while the valve maintains a closed system, preventing aerosol escape to the room environment
Solution Approach 2:
The valve maintains continuous fluid communication between the patient's airway and the breathing circuit throughout the disconnection and reconnection process. The circuit remains pressurized and closed at all times, ensuring continuous protection against aerosol release while allowing seamless transitions between different ventilators or circuits
3Ease of operation
If the breathing circuit is opened to atmosphere during disconnection, then ease of operation is improved, but PEEP is lost causing alveoli collapse and dangerous oxygen level drops
Solution Approach 1:
The valve mechanism with its third port serves as an intermediary that allows the circuit to be opened to atmosphere for disconnection purposes while simultaneously maintaining PEEP through the alternative pathway. The movable valve core directs flow to maintain pressure in the patient connection circuit even when the ventilator connection is opened
Solution Approach 2:
The valve transitions dynamically between different configurations through the movable valve core, adapting the fluid pathways in real-time during the disconnection process. This dynamic reconfiguration allows the system to maintain PEEP during the transition from connected to disconnected state, preventing alveoli collapse while enabling easy circuit changes
Data Source
AI summary
A valve for use with breathing assistance apparatus comprises first, second and third ports (21, 22, 23) for respective connection to a patient breathing tube, a first ventilation apparatus and a second ventilation application. The valve includes a bistable valve mechanism having a first stable configuration in which the first port is in fluid communication with the second port and not the third port; and a second stable configuration in which the first port is in fluid communication with the third port and not the second port. The valve has an actuator configured to transition the bistable valve mechanism between the two stable configurations and preventing the valve mechanism from maintaining a stable intermediate position between the first and second stable configurations. In this way a patient may be switched from one ventilation apparatus to another ventilation apparatus without sudden loss of pressure in the disconnecting circuit causing potentially infected aerosols to be released, and the without sudden loss of positive end expiratory pressure to the patients lungs.