Anesthesia Valve Assembly with Mechanical Backup Flow Control
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Solution Overview
Problem
Anesthesia delivery systems face challenges in maintaining continuous gas flow during power outages, as existing technologies lack reliable mechanical backup controls to ensure uninterrupted gas supply, leading to potential disruptions during critical medical procedures.
Innovation Solution
The implementation of a dual-control system that includes electronic flow selectors for powered states and manually operable backup selectors, which can be deployed in unpowered states, using a diversion valve system with normally-open and normally-closed valves to switch between electronic and mechanical flow control, ensuring continuous gas flow by enabling manual control of needle valves when power is lost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electronic flow control valves are used to control gas flow rates, then flow rate control precision and automation are improved, but system reliability during power outages deteriorates
Solution Approach 1:
The system is segmented into two independent flow control pathways: an electronic flow control valve for automated operation and a mechanical needle valve for manual operation. This segmentation allows the system to switch between electronic and mechanical control modes, ensuring that gas flow can be maintained during power outages through the mechanical backup pathway.
Solution Approach 2:
The system changes the control parameter from purely electronic to a combination of electronic and mechanical parameters. The flow control mechanism transitions from electronic signal-based control to mechanical adjustment-based control, allowing the system to maintain functionality under different operating conditions including power failures.
2Reliability
If a dual-control system with mechanical backup is implemented, then system reliability during power outages is improved, but device complexity increases
Solution Approach 1:
The flow selector assembly serves multiple functions: it controls the electronic flow control valve during powered operation and controls the mechanical needle valve during power outages. This multi-functionality reduces the need for completely separate control systems, thereby limiting the increase in device complexity while maintaining reliability.
Solution Approach 2:
A diversion valve is introduced as an intermediary component that directs gas flow between the electronic flow control valve and the mechanical needle valve. This intermediary mechanism simplifies the overall system architecture by providing a clear switching pathway, reducing the complexity that would otherwise arise from integrating two independent control systems.
3Reliability
If normally-open and normally-closed valves are used in the diversion valve system, then flow switching reliability is improved, but device complexity increases
Solution Approach 1:
The diversion valve system dynamically switches between normally-open and normally-closed states based on operational requirements. During powered operation, the system operates in one state to direct flow through the electronic valve, while during power outages, it transitions to the opposite state to direct flow through the mechanical needle valve, providing adaptive reliability.
Solution Approach 2:
The system incorporates both normally-open and normally-closed valves in advance to prepare for potential power failures. This prior cushioning ensures that regardless of the failure state, there is a pre-configured pathway for gas flow through the mechanical backup system, enhancing reliability without requiring complex real-time decision-making during emergencies.
4Stability of the object's composition
If the flow selector is configured to remain axially fixed relative to the valve shaft, then positional stability is improved, but rotational engagement complexity increases
Solution Approach 1:
The engagement cavity and valve shaft are designed with asymmetric features that allow rotational engagement while maintaining axial fixation. This asymmetric design enables the flow selector to rotate for flow control adjustment while preventing unwanted axial movement, achieving positional stability without requiring complex locking mechanisms.
Solution Approach 2:
The system separates the degrees of freedom by allowing rotation in the angular dimension while constraining movement in the axial dimension. This dimensional separation enables the flow selector to be rotationally engaged with the valve shaft for flow control while remaining axially fixed, simplifying the overall engagement mechanism.
Data Source
AI summary
In various embodiments, an electronic flow selector of a fluid flow control system may be used to select a flow rate of a fluid. The fluid flow control system may be operated in an electronic mode and a manual mode. When the system is in a manual mode, mechanical backup flow selectors may be used to select the flow rate of a fluid. The mechanical backup flow selectors may include a position detection system to determine the flow rate of a fluid. Flow selectors of the flow control system may be rotationally engaged with the valve shafts of each needle valve, while allowing them to translate axially. The flow selectors may remain axially fixed while the valve shafts are axially translated with respect to the needle valves in a fluid flow control system.