Respiration System Rebreathing Line Pressure Monitoring
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Solution Overview
Problem
Respiration systems with small reservoir volumes in rebreathing lines lead to insufficient gas quantities, necessitating frequent and costly fresh gas supplementation, as gas escapes through anesthetic valves, disrupting intended operation.
Innovation Solution
A process involving a pressure sensor in the rebreathing line to detect overpressure or negative pressure thresholds during inspiration and expiration phases, generating error messages when thresholds are exceeded, indicating insufficient reservoir volume, and allowing for adaptation of error messages based on the duration until thresholds are met, with optional support from a radial compressor and fresh gas supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the reservoir volume is reduced, then the device size and cost are decreased, but the gas quantity becomes insufficient requiring frequent fresh gas supplementation
Solution Approach 1:
The system performs preliminary detection of reservoir volume adequacy by monitoring pressure changes during controlled inspiration and expiration phases. The control unit anticipates potential gas insufficiency by detecting pressure threshold violations before they affect normal operation, allowing preventive correction through fresh gas supplementation or system adjustment.
Solution Approach 2:
The patent implements a feedback mechanism where the pressure sensor continuously monitors the reservoir pressure and provides real-time information to the control unit. When the pressure deviates from expected ranges during inspiration and expiration phases, the control unit receives feedback and can trigger alarms or adjust system parameters to maintain adequate gas quantities.
2Device complexity
If the reservoir volume is reduced, then the device complexity is decreased, but gas escapes through anesthetic valves disrupting operation
Solution Approach 1:
The system performs preliminary detection of reservoir volume adequacy by monitoring pressure changes during controlled inspiration and expiration phases. The control unit anticipates potential gas insufficiency by detecting pressure threshold violations before they affect normal operation, allowing preventive correction through fresh gas supplementation or system adjustment.
Solution Approach 2:
The patent implements a feedback mechanism where the pressure sensor continuously monitors the reservoir pressure and provides real-time information to the control unit. When the pressure deviates from expected ranges during inspiration and expiration phases, the control unit receives feedback and can trigger alarms or adjust system parameters to maintain adequate gas quantities.
3Reliability
If a pressure sensor and control unit are added to detect reservoir volume, then the reliability of operation is improved, but the device complexity increases
Solution Approach 1:
The pressure sensor serves multiple functions: it detects reservoir volume adequacy, monitors system pressure during inspiration and expiration phases, and provides data for controlling fresh gas supplementation. The control unit integrates these measurements with system state information to make coordinated decisions about valve control and alarm generation, maximizing the utility of each added component.
Solution Approach 2:
The control unit acts as an intermediary that processes pressure sensor data and coordinates the response of various system components including fresh gas valves and alarm systems. This intermediary function allows the system to maintain reliability through intelligent control while avoiding the need for separate dedicated components for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process reliably identifies and quantifies insufficient reservoir volume, enabling timely replacement and optimizing gas usage by detecting pressure changes and adapting error messages to the degree of undersizing, ensuring proper system operation and reducing gas wastage.
Implementation Method 1
with a pressure sensor, which is connected to the rebreathing line adjacent to the reservoir port
Data Source
AI summary
The function of a respiration system, with a patient port (1) with connected inspiration branch (3) and expiration branch, is checked. A rebreathing line (9) connects the inspiration branch to the expiration branch. A reservoir (25) is connected to a reservoir port (27) in the rebreathing line. An actuatable control valve (29) is provided in the rebreathing line between the expiration branch and the reservoir port. A pressure sensor (33) is connected to the rebreathing line. A control unit (39) is connected to the control valve and to pressure sensor. The process includes closing the control valve for a preset inspiration time and opening it for a preset expiration time. The value sent by the pressure sensor is detected with the control valve opened during the expiration time and compared with a preset first threshold valve. An error message is generated when the value sent exceeds the first threshold value.