Dialyzer Substituate Regulation via Rheological Loading
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Solution Overview
Problem
Existing extracorporeal blood treatment methods struggle to effectively regulate the substituate rate during hemodialysis, hemofiltration, and hemodiafiltration, which is crucial for maintaining optimal fluid balance and treatment efficiency.
Innovation Solution
The method involves regulating the substituate rate as a function of the rheological loading of the dialyzer, determined by transmembrane pressure and flow resistance, allowing for dynamic adjustment of the substituate rate to maintain optimal treatment conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the substituate rate is regulated based on fixed preset values, then the device operation is simple, but the treatment efficiency and fluid balance optimization are insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the substituate rate is continuously adjusted based on measured rheological loading parameters (transmembrane pressure and flow resistance). The control unit receives real-time data from sensors and dynamically modifies the substituate rate to optimize treatment efficiency while maintaining manageable device complexity through automated closed-loop control.
Solution Approach 2:
The patent replaces manual or fixed preset regulation with an automated electronic control system that uses sensors and a control unit to dynamically adjust the substituate rate. This substitution of mechanical/fixed regulation with electronic feedback-based control enables more efficient treatment while keeping the system manageable through automation.
2Quantity of substance
If the substituate rate is increased to improve fluid balance, then fluid withdrawal is enhanced, but the rheological loading on the dialyzer increases reducing treatment quality
Solution Approach 1:
The control unit continuously monitors rheological loading parameters (transmembrane pressure and flow resistance) and adjusts the substituate rate in real-time. When rheological loading increases, the system automatically reduces the substituate rate to maintain treatment quality, while still achieving fluid balance through dynamic adjustment rather than fixed high-rate substitution.
Solution Approach 2:
The patent transitions from static preset substituate rates to dynamic regulation that adapts to changing rheological conditions. The substituate rate is continuously modified based on real-time measurements of transmembrane pressure and flow resistance, enabling the system to respond to varying treatment conditions and maintain optimal performance throughout the procedure.
3Adaptability or versatility
If fixed preset substituate rates are used, then the device operation is simple, but the system cannot adapt to changing treatment conditions
Solution Approach 1:
The system performs self-adjustment by automatically monitoring rheological loading parameters and modifying the substituate rate without requiring manual intervention. The control unit and sensors work together to enable the device to adapt to changing treatment conditions autonomously, maintaining ease of operation while significantly improving adaptability.
4Quantity of substance
If high substituate rates are applied to ensure fluid balance, then fluid withdrawal is sufficient, but treatment efficiency decreases due to excessive rheological loading
Solution Approach 1:
The system uses real-time feedback from rheological loading sensors to dynamically adjust the substituate rate. This ensures sufficient fluid withdrawal is achieved while preventing excessive rheological loading that would reduce treatment efficiency, as the substituate rate is continuously optimized based on actual dialyzer conditions rather than fixed high-rate presets.
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 enables precise regulation of the substituate rate, improving the efficiency and effectiveness of extracorporeal blood treatment by accounting for the dialyzer's rheological loading, thus optimizing fluid balance and treatment outcomes.
Implementation Method 1
A diffuse substance exchange essentially takes place via the membrane of the dialyzer
Implementation Method 2
Only a convective substance exchange takes place
Implementation Method 3
The ultrafiltration rate at which fluid is removed from the patient is dependent on the transmembrane pressure TMP
Data Source
AI summary
A method that regulates supply of substituate in an extracorporeal blood treatment with an extracorporeal blood treatment apparatus comprising a dialyzer divided by a semipermeable membrane into a blood chamber and a dialyzing fluid chamber and a device for supplying substituate. An extracorporeal blood treatment apparatus that includes a device for regulating supply of substituate. Regulation of supply of substituate in the extracorporeal blood treatment takes place as a function of the rheological loading of the dialyzer. To regulate supply of substituate during extracorporeal blood treatment, rheological loading of the dialyzer is determined from transmembrane pressure on the dialyzer and flow resistance of the dialyzer and substituate rate is increased or reduced according to the loading. The selection of dialyzer parameters or blood parameters is therefore no longer necessary and the distinction between pre-dilution and post-dilution is also made obsolete.