Blood Treatment Apparatus Dynamic TMP Control
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Solution Overview
Problem
Current blood treatment apparatuses face challenges in efficiently managing high convective exchange during hemofiltration or hemodiafiltration, particularly in maintaining patient comfort while controlling weight loss, plasma conductivity, and sodium concentration, with existing methods being limited in their ability to rapidly set optimal transmembrane pressure (TMP) values.
Innovation Solution
An apparatus with sensor means to monitor blood volume, ultrafiltration flow rate, weight loss rate, plasma conductivity, and infusion flow rate, coupled with a control unit that calculates and adjusts conductivity, sodium concentration, and TMP values in real-time to optimize fluid exchange and patient comfort during treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TMP is set to maximise ultrafiltration flow rate, then convective exchange capacity is improved, but patient comfort deteriorates
Solution Approach 1:
The patent implements dynamic control of TMP throughout the treatment session, transitioning from higher initial TMP values to lower subsequent values. This dynamic adjustment allows maximization of convective exchange when needed while maintaining patient comfort as treatment progresses, resolving the contradiction between productivity and comfort
Solution Approach 2:
The treatment is divided into multiple phases with different TMP settings. The control unit implements periodic adjustment of TMP, applying higher values during phases requiring maximum convective exchange and lower values during phases prioritizing patient comfort, thus balancing both requirements
2Productivity
If multiple parameters are controlled simultaneously, then treatment efficacy is improved, but device complexity increases
Solution Approach 1:
The control unit continuously monitors multiple parameters (ultrafiltration flow rate, weight loss rate, blood volume, plasma conductivity, sodium concentration) and automatically adjusts TMP and other control variables based on feedback from sensors. This closed-loop control achieves comprehensive parameter management while simplifying operator intervention
Solution Approach 2:
The control unit serves multiple functions simultaneously: monitoring various physiological parameters, calculating optimal TMP values, adjusting pump speeds, and coordinating treatment phases. This multi-functional integration reduces overall system complexity despite managing multiple parameters
3Loss of time
If TMP setting sequence is accelerated, then treatment time is reduced, but safety may be compromised
Solution Approach 1:
The control unit pre-calculates optimal TMP values based on patient-specific parameters and treatment goals before initiating treatment. This preliminary setup enables rapid TMP adjustment during treatment while ensuring safety through pre-validated parameter selections
Solution Approach 2:
The system incorporates safety margins and validated TMP ranges in the pre-programmed treatment protocol. Even when accelerating TMP adjustments, the control unit ensures values remain within clinically proven safe boundaries, cushioning against potential safety risks
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 apparatus ensures efficient convective exchange, maintains patient comfort by dynamically controlling fluid and electrolyte balance, and rapidly sets optimal TMP values to enhance treatment efficacy.
Implementation Method 1
at least one treatment unit (for example a dialyser or a filter or ultrafilter or a plasma filter or a filtering unit of another type) having a semipermeable membrane which separates the treatment unit into two chambers
Implementation Method 2
setting the TMP value at a level which is such as to maximise the ultrafiltration flow rate and consequently the volume of fluid infused into the patient
Implementation Method 3
maximise the convective exchange through the membrane and thus the purification of the blood from undesired particles
Data Source
AI summary
An apparatus for extracorporeal blood treatment is described, including a treatment unit, an extracorporeal blood circuit, an infusion line of a replacement fluid, a dialysis line connected in inlet to the second chamber, and a fluid evacuation line; sensors for determining a first parameter relating to a patient's blood volume (BV %) a second parameter relating to an ultrafiltration flow rate (UFR) or to a patient's weight loss rate (WLR), a third parameter (Cd, Na) relating to a conductivity or concentration of a liquid crossing the dialysis line and/or the infusion line, and a fourth parameter relating to an infusion flow rate (QINF), and a control unit for performing a control procedure.