Blood Treatment Fluid Path Control to Prevent Cross-Contamination
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Solution Overview
Problem
Existing extracorporeal blood treatment apparatuses face a risk of contamination due to used treatment fluid inadvertently flowing into fresh fluid paths, necessitating additional safety measures to prevent cross-contamination.
Innovation Solution
Incorporation of a pressure-based checking device that ensures fluid direction monitoring by comparing upstream and downstream pressures, allowing a fluid connection only if the upstream pressure is higher than downstream pressure, thereby ensuring fluid flows towards the drain and not into fresh treatment fluid paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flow connection is created between the first and second flow paths for special operating modes, then operational versatility is improved, but the risk of fluid contamination increases
Solution Approach 1:
A three-way valve is introduced as an intermediary component to control and manage the flow connection between the first and second flow paths. The valve acts as a mediator that can establish or interrupt fluid connections between different flow paths based on operational requirements, thereby enabling operational versatility while preventing uncontrolled contamination through its selective connection capability
Solution Approach 2:
A control unit with sensing capabilities is implemented to monitor the operational state and automatically control the three-way valve. The control unit receives feedback about the current operating mode and automatically positions the valve to either establish or interrupt flow connections, ensuring that cross-contamination is prevented while maintaining the ability to switch between different operational modes
2Object-affected harmful factors
If separate flow paths are used for fresh and used treatment fluid, then contamination risk is reduced, but device complexity increases
Solution Approach 1:
The three-way valve is designed as a multi-functional component that serves multiple purposes: it controls flow during normal operation, enables bypass operations, facilitates flushing procedures, and allows for cleaning operations. By consolidating these functions into a single valve component, the system maintains separate flow paths for contamination prevention without proportionally increasing device complexity
Solution Approach 2:
The control unit integrates multiple control functions into a single integrated system that manages the three-way valve, monitors operational states, and automatically switches between different operating modes. This merging of control functions reduces the overall complexity compared to having separate control mechanisms 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
Effectively reduces the risk of cross-contamination by ensuring that used treatment fluid is directed to the drain, maintaining the integrity of fresh fluid paths during special operating modes.
Implementation Method 1
a pressure-based checking device...designed such that a fluid connection between the upstream portion and the downstream portion of the flow path for a special operating mode can only be established if the pressure-based checking device detects an operating state in which it is ensured that fluid in the flow path for a special operating mode flows towards a flow path leading to a drain
Data Source
AI summary
The invention relates to an extracorporeal blood treatment apparatus comprising a blood treatment unit 1 that is divided by a semipermeable membrane 2 into a first compartment 3, which is part of a fluid system II, and a second compartment 4, which is part of an extracorporeal blood circuit I. The invention also relates to a method for operating a blood treatment apparatus of this kind. The blood treatment apparatus according to the invention has a pressure-based checking device 32 which interacts with the control unit 31 for a valve device 21 and is designed such that a fluid connection between an upstream portion 20A and a downstream portion 20B of a flow path 20 for a special operating mode can only be established if the pressure-based checking device 32 detects an operating state in which it is ensured that fluid in the flow path 20 for a special operating mode flows towards a flow path 10 leading to a drain 11. This ensures that the fluid in question can only flow into the flow path 10 that leads to the drain 11, and cannot get into another flow path 8 in which fresh treatment fluid is located.