Medical Solution Mixing with Conductivity Modulation Feedback
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Solution Overview
Problem
Existing methods for preparing medical solutions, such as dialysis solutions, require multiple conductivity sensors to monitor the concentration of individual components and the mixed solution, resulting in a complex system.
Innovation Solution
A method and apparatus that modulate the concentrations of the components over time, allowing a single conductivity measurement to monitor the mixed solution's conductivity, enabling detection of errors in component concentrations without individual sensors for each component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple conductivity sensors are used to monitor individual component concentrations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the monitoring of multiple component concentrations into a single conductivity measurement of the mixed solution. Instead of using separate sensors for each component (component A conductivity sensor and component B conductivity sensor), the invention combines them into one sensor that measures the total conductivity of the mixed solution, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The single conductivity sensor in the mixed solution serves multiple functions: it monitors the combined concentration of both components simultaneously, replaces what would traditionally require multiple specialized sensors, and provides a universal measurement point that simplifies the overall monitoring system architecture
2Measurement precision
If individual conductivity sensors are provided for each component, then measurement precision is improved, but the number of sensors increases
Solution Approach 1:
The invention combines multiple sensing functions into a single sensor. The single conductivity sensor in the mixed solution simultaneously detects information about both component A and component B concentrations, replacing what would traditionally require at least two separate sensors, thereby reducing the quantity of sensors needed
3Device complexity
If a single conductivity sensor is used for the mixed solution, then device complexity is reduced, but measurement precision for individual components may worsen
Solution Approach 1:
The invention introduces dynamic modulation of component concentrations during conveying. By modulating the concentration of component A and component B in a time-dependent manner (e.g., alternating between different concentration ratios), the single sensor measurement becomes dynamically informative, allowing extraction of individual component concentration information through analysis of the modulation pattern
Solution Approach 2:
The system uses feedback from the single conductivity sensor measurement to determine the actual concentrations of individual components. The measured conductivity value is fed back into the control system, which uses this information to calculate and adjust the individual component concentrations, ensuring measurement precision is maintained despite using only one sensor
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
Simplifies the monitoring process by using a single sensor to maintain constant sum conductivity, allowing for accurate detection of errors in component concentrations and reducing system complexity.
Implementation Method 1
the conductivity of the mixed solution or a parameter of the mixed solution correlated with the conductivity is measured at at least one measurement point
Data Source
AI summary
The present invention relates to a method for preparing a medical solution from at least one first liquid component and at least one second liquid component, wherein the first component and the second component are conveyed with a respective conveying means to obtain a mixed solution, wherein the conveying means are operated such that a modulation of the concentration of the first and second components takes place and the conductivity or a parameter of the mixed solution correlating with the conductivity is measured at a measurement point, wherein the modulation of the concentrations takes place in a desired state such that no modulation or a specific desired modulation of the measured conductivity or of the parameter correlated with the conductivity occurs. The present invention furthermore relates to an apparatus for preparing a medical solution as well as to a blood treatment device having such an apparatus.