Dialyzate Flow Phasing to Reduce Dialysis Disequilibrium
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Solution Overview
Problem
Existing extracorporeal blood treatment apparatuses face complications such as disequilibrium syndrome due to rapid transfer of electrolytes and substances like potassium ions or urea from blood into the dialysis solution, leading to symptoms like headaches and vomiting.
Innovation Solution
The apparatus employs a control unit to operate in two phases, with a lower dialyzate pump flow rate and higher component concentration in the first phase, gradually increasing to normal levels in the second phase, to slow down the substance transfer from blood into the dialysis solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dialyzate pump operates with a high flow rate from the start of treatment, then the dialysis efficiency is maximized and treatment time is minimized, but the rapid transfer of substances from blood into dialysis solution causes disequilibrium syndrome
Solution Approach 1:
The dialyzate pump flow rate is made dynamic rather than constant. The system automatically adjusts the flow rate in real-time based on treatment phase: operating at a lower flow rate during the initial phase to prevent disequilibrium syndrome, then transitioning to a higher flow rate in subsequent phases to maximize dialysis efficiency. This dynamic adjustment resolves the contradiction between patient safety and treatment productivity.
Solution Approach 2:
The system performs preliminary action by operating at a reduced flow rate during an initial phase before the main treatment phase. This preliminary period allows the patient's body to adapt gradually to the dialysis process, preventing the sudden transfer of substances that causes disequilibrium syndrome, while still achieving the required dialysis dosage over the complete treatment time.
2Object-affected harmful factors
If the treatment duration is extended to reduce substance transfer rate, then disequilibrium syndrome is reduced, but the treatment time increases and dialysis efficiency decreases
Solution Approach 1:
Rather than extending treatment time, the system dynamically adjusts the flow rate profile during the treatment. The high-flow-rate period is delayed until after the initial adaptation phase, allowing the system to maintain high productivity while preventing disequilibrium syndrome. The total treatment time remains optimal while achieving both safety and efficiency goals through temporal distribution of flow rates.
3Productivity
If the dialysis solution concentration is high from the start, then the concentration gradient for substance removal is maximized, but the rapid diffusion of substances from blood causes complications
Solution Approach 1:
The system uses a preliminary phase with modified dialysis solution composition (lower concentration of certain components) before transitioning to the standard high-concentration solution. This preliminary period reduces the initial concentration gradient, preventing rapid substance transfer and disequilibrium syndrome, while still achieving effective substance removal during the subsequent main treatment phase when the full concentration gradient is applied.
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 reduces the likelihood and severity of disequilibrium syndrome by ensuring a gradual removal of substances, maintaining patient compatibility and preventing rapid diffusion at the start of treatment.
Implementation Method 1
the two chambers are separated from one another by a semipermeable membrane
Implementation Method 2
separated from one another by a semipermeable membrane
Data Source
AI summary
The present invention relates to an apparatus for an extracorporeal blood treatment having an extracorporeal blood circuit in which a dialyzer is arranged and having a dialyzate circuit, wherein the blood circuit is in fluid communication with a first chamber and the dialyzate circuit is in fluid communication with a second chamber of the dialyzer, and wherein the two chambers are separated from one another by a semipermeable membrane, with a dialyzate pump for a conveying of the dialysis solution being present in the dialyzate circuit, wherein the apparatus has a control unit that is configured to operate the apparatus in a first phase and in a second phase following the first phase, wherein the dialyzate pump is operated with a smaller flow rate in the first phase than in the second phase and/or wherein the dialyzate pump conveys a dialysis solution in the first phase that is of a higher concentration with respect to at least one component than in the second phase.