Endoscope Channel Reprocessing with Differential Pressure Flow Control
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Solution Overview
Problem
Existing medical instrument reprocessing systems face challenges in ensuring consistent fluid flow through endoscope channels, which can become obstructed, leading to inadequate cleaning, disinfection, and sterilization due to debris blockages, and lack of real-time monitoring to adjust flow rates accordingly.
Innovation Solution
A pressurized fluid channel system with a first valve and a pressure differential sensor that controls the flow rate of pressurized fluid by modulating the valve based on pressure differential readings, ensuring the fluid flow meets target rates through the use of a channel flow subsystem with proportional valves and gauge pressure sensors, and a microprocessor to manage fluid circulation and adjust valve positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid flow rate is increased to ensure adequate cleaning, then cleaning effectiveness is improved, but risk of channel obstruction and instrument degradation increases
Solution Approach 1:
The system employs pressure differential sensors to continuously monitor fluid flow through endoscope channels and provides feedback to a control system. When obstruction is detected (indicated by abnormal pressure differential), the system automatically adjusts or stops fluid delivery to prevent channel damage, while maintaining optimal flow rates for effective cleaning during normal operation
Solution Approach 2:
The system dynamically adjusts fluid flow rates based on real-time channel conditions. Flow rates are modified during different phases of the reprocessing cycle and can be individually adjusted for different channels based on their specific requirements, allowing optimization of cleaning effectiveness while preventing obstruction
2Reliability
If real-time flow rate monitoring is implemented to prevent obstruction, then instrument safety is improved, but system complexity increases
Solution Approach 1:
The system replaces complex mechanical flow control mechanisms with electronic sensing and control. Pressure differential sensors electronically monitor flow conditions, and electronic valves control fluid delivery, simplifying the system compared to purely mechanical approaches while providing precise real-time monitoring and control
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by automatically detecting channel obstruction through pressure differential monitoring and autonomously adjusting flow rates or stopping delivery without requiring external intervention, reducing the need for complex manual control systems
3Productivity
If high pressure fluid is used to clear obstructions, then flow rate is improved, but risk of instrument damage increases
Solution Approach 1:
The system applies preliminary protective action by continuously monitoring pressure differentials before obstruction becomes severe. When potential obstruction is detected, the system proactively reduces or stops fluid delivery to prevent instrument damage, rather than attempting to clear established obstructions with high-pressure bursts
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 solution ensures consistent and effective cleaning, disinfection, and sterilization by maintaining optimal fluid flow rates through endoscope channels, preventing obstruction and degradation from excessive fluid exposure, while monitoring and adjusting flow rates in real-time to maintain desired pressures and flow rates.
Implementation Method 1
a first pressure differential sensor configured to detect a pressure differential in the pressurized fluid flowing into the first valve
Data Source
AI summary
An instrument reprocessor for cleaning, disinfecting, and/or sterilizing a medical instrument is disclosed. To reprocess instruments having one or more channels defined therein, the reprocessor can include one or more flow control systems configured to control a flow of fluid through each channel. In various embodiments, a flow control system can include a differential pressure sensor and a proportional valve for controlling the fluid flow in a channel. The reprocessor can also include, one, a fluid circulation pump which can be configured to supply the flow control systems with fluid and, two, a system for controlling the pressure of the fluid supplied to the flow control systems. The reprocessor can also include a system for supplying a metered amount of fluid to the fluid circulation system. The system can include a reservoir having a fluid height sensor to monitor the amount of fluid therein and a pump configured to supply the reservoir with fluid.