Dual Mode Electronic Flow Control System for Anesthesia Gas Delivery
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Solution Overview
Problem
Anesthesia delivery systems face challenges in seamlessly transitioning between electronic and manual control modes for gas flow rates, particularly during power outages, leading to potential confusion and disruption in medical procedures.
Innovation Solution
The integration of electronic flow selectors and backup mechanical flow selectors, utilizing a diversion valve system with normally-open and normally-closed valves, allows for smooth switching between electronic and manual control modes, ensuring continuous gas delivery and minimizing user confusion by maintaining functional similarity between the two modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electronic flow selectors are used to control gas flow rates, then control precision and automation are improved, but system complexity and vulnerability to power outages increase
Solution Approach 1:
The system incorporates backup mechanical flow selectors and a diversion valve system that automatically activates during power outages. This beforehand cushioning ensures continuous gas delivery by preparing alternative control mechanisms in advance, allowing seamless transition from electronic to manual control without interrupting patient care.
Solution Approach 2:
The flow control system is designed with multi-functionality by integrating both electronic flow selectors and mechanical backup selectors within a single unified interface. The diversion valve system enables the same physical interface to serve dual purposes: electronic control during powered operation and manual control during power outages, eliminating the need for separate control systems.
2Reliability
If backup mechanical flow selectors are added for power outage scenarios, then reliability is improved, but device complexity and user confusion increase
Solution Approach 1:
The system merges electronic and mechanical flow selection capabilities into a single unified control interface. The diversion valve system physically combines both control pathways, allowing practitioners to interact with one consistent set of controls regardless of power status. This merging eliminates the need for separate control panels or interfaces for electronic and manual modes.
Solution Approach 2:
The flow selector assembly serves multiple functions by integrating electronic flow selectors, mechanical backup selectors, and a diversion valve system into a single multi-functional unit. This universal design allows the same physical interface to perform both electronic control and manual backup operations, reducing overall system complexity despite the presence of dual control mechanisms.
3Ease of operation
If a diversion valve system is implemented to switch between electronic and manual modes, then transition smoothness is improved, but device complexity increases
Solution Approach 1:
The diversion valve system acts as an intermediary mechanism that automatically manages the transition between electronic and manual control modes. This mediator component handles the complexity of mode switching internally, allowing practitioners to simply rotate the flow selector knob without needing to manually configure or activate different control systems. The diversion valve seamlessly directs gas flow based on power status.
4Measurement precision
If electronic flow control valves are used, then flow rate precision is improved, but vulnerability to power failures increases
Solution Approach 1:
The system implements beforehand cushioning by incorporating mechanical backup flow control valves that are ready to immediately take over during power failures. This preparatory measure ensures that the precise flow control capability is maintained through the backup mechanical system, which can deliver accurately controlled gas flows even when electronic systems fail.
Solution Approach 2:
The system utilizes parameter changes by transitioning from electronic control parameters to mechanical control parameters during power failures. The diversion valve system enables this parameter change by switching the control mechanism while maintaining the essential function of precise flow rate delivery through the backup mechanical valves, effectively adapting to the changed operating conditions.
Data Source
AI summary
In various embodiments, two or more electronic flow selectors of an electronic fluid flow control system may be used to control the flow rates of multiple fluids. In a total flow control mode, a first electronic flow selector may be used to select a total flow rate of two or more fluids. A second electronic flow selector may be used to select a flow rate or ratio of a flow rate of one fluid to the total flow rate of the two or more fluids. In a direct flow control mode, each electronic flow selector may be used to select a flow rate of a unique fluid. One of the fluids may be oxygen, and the other fluid, a balance gas, may be selected as either nitrous oxide or air using an electronic balance gas selector.