Bistable Ventilator Switching Valve for PEEP Retention
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Solution Overview
Problem
Disconnecting breathing circuits in ventilator systems poses safety risks for both healthcare workers and patients due to potential aerosol release and loss of positive end-expiratory pressure (PEEP), which can lead to dangerous oxygen desaturation and increased infection susceptibility in patients with severe lung disease.
Innovation Solution
A bistable valve mechanism with first, second, and third ports, and an actuator that transitions between two stable configurations to maintain fluid communication between selected ports, preventing intermediate positions and ensuring quick, safe disconnection of ventilator breathing circuits while maintaining airway pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the breathing circuit is disconnected to change ventilators or move patients, then operational flexibility is improved, but aerosol release and staff exposure risk increase
Solution Approach 1:
A T-connector valve serves as an intermediary device between the patient's breathing circuit and multiple ventilator sources. The valve allows switching between different ventilators or between ventilator and manual ventilation without completely disconnecting the patient's breathing circuit, thereby maintaining circuit integrity and preventing aerosol release while providing operational flexibility.
Solution Approach 2:
The breathing circuit is segmented into separate connection points through the T-connector valve, allowing one branch to remain connected to the patient while another branch connects to different ventilator sources. This segmentation enables safe switching operations without compromising the sealed breathing circuit.
2Adaptability or versatility
If the breathing circuit is disconnected to atmosphere, then circuit changes are enabled, but positive end-expiratory pressure (PEEP) is lost causing alveolar collapse
Solution Approach 1:
The T-connector valve acts as an intermediary that maintains the sealed breathing circuit during transitions. By keeping the patient connection sealed and allowing ventilator switching at the valve level, PEEP is maintained throughout the circuit, preventing alveolar collapse while enabling circuit changes.
Solution Approach 2:
The valve is pre-configured with multiple connection ports that can be connected to different ventilators or manual ventilation devices before patient connection. This preliminary setup allows for seamless switching without disconnecting the patient's sealed breathing circuit, thereby maintaining PEEP throughout the process.
3Reliability
If a clamp is applied to the endotracheal tube to maintain PEEP during disconnection, then oxygen saturation is maintained, but life-threatening complications can occur if patient inspiratory effort is generated
Solution Approach 1:
The T-connector valve provides a safe intermediary mechanism for maintaining PEEP during ventilator transitions. Unlike clamps that create dangerous negative pressure during patient inspiratory efforts, the valve maintains positive pressure through its sealed design, allowing safe switching without the risk of barotrauma or pneumothorax from excessive negative pressure.
Data Source
Figure 1(1a)~1(1d)
Figure 2(2a)~2(2c)
Figure 3(3a)~3(3b)
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 patient's lungs.