Balancing Unit Pressure Control for Medical Fluids
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Solution Overview
Problem
Current balancing units for medical fluids, particularly dialysate, face challenges in maintaining precise pressure control and stability during the balancing process, leading to inaccuracies in mass and volume flow, which can affect the safety and efficacy of medical treatments like dialysis.
Innovation Solution
A balancing unit with a pressure-controlled conveying unit, such as a centrifugal pump, that operates as a constant-pressure source, using adjustable rotation speed to maintain a predetermined maximum filling pressure without the need for additional control units or valves, ensuring stable fluid flow and minimizing forces on the balancing chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional balancing units are used, then fluid flow balancing can be achieved, but pressure control precision deteriorates leading to inaccuracies in mass and volume flow
Solution Approach 1:
The patent changes the operating parameter of the conveying unit from variable pressure to constant pressure operation. By adjusting the rotation speed of the conveying unit to maintain a predetermined maximum filling pressure, the system achieves precise pressure control and accurate mass and volume flow measurement without requiring additional control units or valves.
2Reliability
If additional control units or valves are added to improve pressure control, then pressure stability improves, but device complexity increases
Solution Approach 1:
The conveying unit is designed to operate as a constant-pressure source inherently, using its own rotation speed adjustment to maintain the predetermined maximum filling pressure. This self-regulating mechanism eliminates the need for external control units or valves, thereby maintaining pressure stability while avoiding increased device complexity.
3Productivity
If conventional conveying units are used, then fluid conveyance is achieved, but forces on the balancing chamber increase affecting measurement accuracy
Solution Approach 1:
The patent changes the pressure parameter of the conveying unit to operate at constant pressure rather than variable pressure. This maintains the fluid conveyance capability while minimizing the forces acting on the balancing chamber, thereby improving the accuracy of fluid volume measurement during the balancing process.
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 enhances the accuracy and safety of medical fluid balancing by maintaining constant pressure, reducing construction complexity, and minimizing contamination risks, while allowing for precise control of fluid volumes and pressures, thereby improving the reliability of treatments like dialysis.
Implementation Method 1
The conveying unit (15a, 15b, 15c, 15d) can be operated as a constant-pressure source after filling the balancing chamber(s). The maximum filling pressure can be set by means of an adjusted rotation speed of the conveying unit.
Data Source
AI summary
A balancing unit for medical fluids includes at least one balancing chamber and at least one conveying unit for filling the balancing chamber, in which the conveying unit is a pressure controlled conveying unit and/or is designed and provided for being operated in at least one operating state as a constant-pressure source. An external medical functional unit, a treatment apparatus and methods are also described.