Filter Identification via Pressure Decay Measurement
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Solution Overview
Problem
Existing methods for identifying the correct filter in blood treatment processes require high technical and time effort due to the need for multiple pressure sensor evaluations, which can lead to errors in filter selection.
Innovation Solution
A method involving generating pressure on one side of the filter using a pump and measuring pressure development over time after the pump is switched off, allowing for the determination of ultrafiltration coefficient and flow resistance using a single pressure sensor, potentially integrated into existing blood treatment devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pressure sensors are used to determine ultrafiltration constant, then measurement precision is improved, but device complexity and time effort increase
Solution Approach 1:
The patent extracts the pressure measurement function from multiple sensors and consolidates it into a single pressure sensor that measures pressure differential across the filter medium. By taking out the essential measurement capability and eliminating redundant sensors, the system achieves the same determination accuracy with reduced complexity.
Solution Approach 2:
The patent introduces a pressure differential measurement across the filter medium as an intermediary parameter that indirectly determines ultrafiltration constant. Instead of directly measuring multiple pressure points simultaneously, the system uses the pressure differential as a mediator to infer filter characteristics, simplifying the measurement setup.
2Measurement precision
If multiple pressure sensors are used to determine ultrafiltration constant, then measurement precision is improved, but time effort increases
Solution Approach 1:
The patent extracts the time-dependent pressure differential measurement from a multi-sensor system and uses it as a single diagnostic parameter. By taking out the essential time-course information and eliminating the need for simultaneous multi-sensor evaluation, the system reduces time effort while maintaining determination accuracy.
Solution Approach 2:
The patent performs preliminary pressure equalization by applying pressure to one side of the filter medium before measurement. This preliminary action prepares the system in a controlled state, allowing accurate determination of ultrafiltration constant from the subsequent pressure differential measurement without requiring complex multi-sensor coordination.
3Reliability
If filter recognition is performed using outer features, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical/optical feature recognition with a hydraulic measurement system. Instead of using sensors to detect mechanical or optical features on the filter exterior, the system uses pressure differential measurement across the filter medium to identify filter type, achieving reliable filter recognition with simpler device architecture.
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 approach simplifies the filter identification process, reducing technical effort and enabling accurate determination of filter types and characteristics without additional sensors, ensuring correct filter usage in blood treatments.
Implementation Method 1
generating a pressure in a fluid, in particular in a liquid such as in a dialysis solution on the retentate side or on the permeate side of the filter by means of a pressure source such as a pump
Implementation Method 2
the filter has at least one retentate side and at least one permeate side which are separated from one another by at least one filter medium
Data Source
AI summary
A method of identifying a type of a filter, which has at least one retentate side and at least one permeate side separated from one another by at least one filter medium, includes generating a pressure in a fluid, in particular in a liquid, on the retentate side or on the permeate side via a pressure source. The method then includes switching off the pressure source, and measuring a pressure development in the fluid over time subsequent to the switching off of the pressure source.