Buffer Chamber Air Barrier Prevents Dialysate Back-Contamination
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Solution Overview
Problem
Existing systems for connecting medical apparatus to a centralized liquid source face challenges in preventing back-contamination, particularly during disinfection processes, where disinfectant liquids can propagate through distribution circuits, posing risks to patient safety in other treatment stations.
Innovation Solution
A connecting device with a buffer chamber generating an air barrier and a monitoring system using liquid level sensors or air presence sensors to ensure separation between the medical apparatus and the liquid source during disinfection or washing modes, preventing the spread of contaminants and ensuring safety by maintaining an air gap in the buffer chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct liquid connection is maintained between the medical apparatus and the centralized distribution system, then continuous liquid supply is ensured, but the risk of back-contamination spreads to the entire distribution circuit
Solution Approach 1:
A buffer chamber is introduced as an intermediary component between the medical apparatus and the centralized distribution system. This buffer chamber contains a liquid level sensor that detects when the liquid level rises above a safe threshold, indicating potential back-contamination. The buffer chamber acts as a isolation barrier that prevents contaminants from spreading to the entire distribution circuit while maintaining continuous liquid supply to the medical apparatus.
2Object-affected harmful factors
If a buffer chamber with air barrier is introduced to prevent back-contamination, then safety against contaminant propagation is improved, but device complexity increases
Solution Approach 1:
The buffer chamber utilizes pneumatic principles by maintaining an air barrier above the liquid level. This air cushion prevents liquid backflow and contaminant propagation without requiring complex mechanical valves or pumps. The system leverages the natural properties of gas-liquid interfaces to achieve isolation, simplifying the overall device structure compared to purely mechanical solutions.
3Measurement precision
If liquid level sensors are installed to monitor the buffer chamber, then detection precision of liquid presence is improved, but device complexity and cost increase
Solution Approach 1:
The liquid level sensor in the buffer chamber provides self-monitoring capability that triggers automatic safety responses. When the sensor detects liquid presence above the safe level, it automatically activates the safety mechanism to close the connection to the centralized system. This self-service approach eliminates the need for complex external monitoring systems or manual intervention, achieving high detection precision with minimal additional complexity.
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
The device effectively prevents back-contamination by creating a safety barrier of air within the buffer chamber, ensuring separation during critical operational stages and maintaining the integrity of the liquid distribution system, thus safeguarding patient safety and preventing contamination of the centralised distribution network.
Implementation Method 1
A connecting device with a buffer chamber generating an air barrier and a monitoring system using liquid level sensors or air presence sensors to ensure separation between the medical apparatus and the liquid source during disinfection or washing modes
Implementation Method 2
a siphon connecting the lower part of the buffer chamber with a source of the cleaning or disinfecting agent
Data Source
AI summary
A connecting device comprises a buffer chamber (2), a first connecting line (3) between a liquid source (4) and an inlet (5) of the buffer chamber, a second connecting line (9) between an outlet (10) of the buffer chamber and the medical treatment apparatus (11), two valves (7, 8) arranged in series on the first connecting line, a pump (12) on the second connecting line, two liquid level sensors (15, 16) operating in the buffer chamber, a vent valve (18) connected to the buffer chamber. The liquid source is a centralized distribution plant of dialysate, while the medical treatment apparatus is a dialysis apparatus. The invention prevents back-contamination of the centralized plant with disinfectant sourced from the dialysis apparatus.