Adaptive Ultrafiltration Control for Extracorporeal Blood Processing
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Solution Overview
Problem
Extracorporeal blood processing technologies face challenges in controlling ultrafiltration rates effectively, leading to intradialytic complications such as hypotension, due to overestimation of fluid extraction and variability in physiological responses during treatment sessions.
Innovation Solution
A control system for extracorporeal blood processing that intermittently adjusts ultrafiltration rates based on real-time sensor data, performing a sequence of distinct rates to identify the individual's tolerance and prevent adverse physiological stress, thereby optimizing the ultrafiltration rate to reduce complications and ensure efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a constant ultrafiltration rate is applied based on total UF divided by treatment duration, then the treatment can be completed within the planned time frame, but intradialytic complications such as hypotension may occur due to overestimation of fluid extraction
Solution Approach 1:
The patent applies dynamics by transitioning from a static, pre-determined constant ultrafiltration rate to a dynamic, adaptive ultrafiltration rate that changes in real-time based on monitored physiological parameters. The system continuously adjusts the ultrafiltration rate during treatment to optimize both efficiency and safety, resolving the contradiction between maintaining productivity and ensuring reliability.
Solution Approach 2:
The patent implements feedback by using physiological sensors to monitor patient status (such as blood pressure, heart rate, and other vital signs) and feeding this information back to the control system. The control system then adjusts the ultrafiltration rate based on this feedback, allowing the system to respond to actual patient conditions rather than relying on pre-calculated estimates, thereby preventing complications while maintaining treatment efficiency.
2Quantity of substance
If extensive fluid extraction is performed to remove accumulated fluid, then the individual's weight is reduced towards dry weight, but physiological stress increases leading to intradialytic complications
Solution Approach 1:
The patent applies periodic action by implementing intermittent optimization procedures during the treatment session. Rather than continuously changing the ultrafiltration rate, the system performs periodic assessments of physiological parameters and adjusts the rate at specific intervals. This allows the system to remove substantial fluid while providing regular opportunities to assess and reduce physiological stress, balancing fluid removal with patient tolerance.
Solution Approach 2:
The patent uses parameter changes by modifying the ultrafiltration rate based on changes in physiological parameters monitored during treatment. When physiological stress indicators change (such as blood pressure drops or heart rate changes), the system adjusts the ultrafiltration rate parameter to reduce stress while continuing fluid removal. This dynamic parameter adjustment resolves the contradiction between removing sufficient fluid and minimizing physiological harm.
3Loss of time
If the ultrafiltration rate is increased to shorten treatment duration, then productivity improves, but the risk of complications such as hypotension and cramps increases
Solution Approach 1:
The patent applies self-service by enabling the treatment system to automatically monitor, assess, and adjust the ultrafiltration rate without requiring continuous manual intervention. The system serves itself by using its own sensors and control algorithms to optimize the treatment parameters in real-time, allowing for efficient treatment duration while automatically preventing complications through self-regulation of the ultrafiltration rate.
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
The system reduces the risk of intradialytic complications by dynamically adjusting ultrafiltration rates according to individual physiological responses, ensuring safe and efficient fluid removal during extracorporeal blood processing.
Implementation Method 1
The extraction of fluid is commonly known as 'ultrafiltration' (UF) and may be performed by establishing a pressure gradient across a porous or semi-permeable filter to drive fluid through the filter along the established pressure gradient.
Implementation Method 2
The extraction of fluid is commonly known as 'ultrafiltration' (UF) and may be performed by establishing a pressure gradient across a porous or semi-permeable filter to drive fluid through the filter
Data Source
AI summary
A control system operates (201) an apparatus for extracorporeal blood processing to extract, process and return the blood of an individual while removing fluid from the blood in accordance with a set value for ultrafiltration rate, UFR. The control system further obtains (202) sensor data representing one or more physiological parameters of the individual, and intermittently performs an optimization procedure (203) to generate the set value based on the sensor data. The optimization procedure comprises: evaluating (203A) the sensor data for detection of a limiting physiological status, LPS, sequentially controlling (203B) the apparatus in accordance with a test sequence of UFRs until the LPS is detected for a current UFR, and updating (203C) the set value based on the current UFR for use in operating the apparatus subsequent to the optimization procedure. The control system may perform a series of temporally separated optimization procedures during a treatment session to adapt the UFR to the individual.