Peritoneal Dialysis Pump Control for Stable Dialyzate Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dialysis devices struggle to maintain a continuous volume flow of dialyzate with high precision, particularly in pediatric treatments, due to pressure fluctuations caused by the switching of pumps, which can lead to patient discomfort and potential injury.
Innovation Solution
A device and method using two discontinuous pumps with adaptive control to suspend pressure measurements, calculate compensation, and postpone valve switching times to avoid pressure falsification, utilizing an optimization algorithm to optimize valve timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two discontinuous pumps are used to provide continuous dialyzate flow, then productivity is improved, but pressure measurement accuracy deteriorates due to pressure falsification during valve switching
Solution Approach 1:
The control system suspends pressure measurements before valve switching occurs, or calculatory compensation is applied based on predicted pressure changes. This preliminary action prevents falsified pressure readings from disrupting pump operation, allowing continuous flow maintenance while preserving measurement accuracy through proactive intervention.
Solution Approach 2:
The control system continuously monitors pressure measurements and uses feedback to detect when pressure falsification occurs during valve switching. Based on this feedback, the system adaptively adjusts pump operation or postpones valve switching timing, creating a closed-loop control that maintains both continuous flow and measurement accuracy.
2Measurement precision
If valve switching timing is optimized to avoid pressure falsification, then measurement precision is improved, but device complexity increases due to adaptive control requirements
Solution Approach 1:
The control system divides the pump operation cycle into distinct phases with predetermined valve switching times. By segmenting the control logic into discrete timing intervals and states, the system manages complexity through structured organization rather than requiring sophisticated real-time adaptive algorithms, thus maintaining measurement precision with manageable device complexity.
3Measurement precision
If pressure measurements are suspended during valve switching, then measurement precision is improved, but loss of time increases due to measurement interruptions
Solution Approach 1:
The control system implements periodic valve switching at predetermined intervals that are synchronized with pump operation cycles. By using periodic rather than continuous measurement suspension, the system obtains sufficient pressure data for accurate control while minimizing measurement interruptions, thus balancing measurement precision with time efficiency through rhythmic, predictable operation.
Data Source
AI summary
The present invention relates to a device for dialysis treatment, in particular a device for peritoneal dialysis, having first and second discontinuous pumps that are switchable by means of at least two valves and having a control for generating a continuous volume flow of dialyzate, characterized in that the control is adapted to carry out at least one of the following steps: a) suspending at least one pressure measurement during a switching time of at least one of the valves; b) calculatory compensation of a portion of a result of a pressure measurement based on unit properties during a switching time of at least one of the valves; c) postponing a valve switching point in time of the second pump so that the valve switching point in time of the second pump does not coincide with a valve switching point in time of the first pump; and d) adaptive postponement of a valve switching point in time of the second pump so that said valve switching point in time does not coincide with a valve switching point in time of the first pump, wherein use is preferably made by the control of an optimization algorithm for determining a point in time to which the valve switching point in time of the second pump is postponed.