Parallel Pump ECMO Circuit for High Flow and Fluid Balance
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Solution Overview
Problem
Existing extracorporeal blood treatment systems face challenges in achieving precise fluid balance and maintaining blood temperature during high-flow ECMO treatments, particularly due to calibration inaccuracies and the need for operator intervention at higher flow rates.
Innovation Solution
A multiple treatment fluid stream system employing non-blood pumps in parallel for ECBT and ECMO, with a controller managing pump rates and directions to achieve high volume flow and precise fluid balance, and incorporating temperature control mechanisms to maintain blood temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single blood pump is used for ECMO treatment, then the device complexity is reduced, but the blood flow rate is insufficient for high-volume ECMO requirements
Solution Approach 1:
The patent applies multi-functionality by enabling the extracorporeal blood treatment device to perform both traditional ECBT functions (dialysis, hemofiltration) and ECMO functions (blood oxygenation) using the same permanent system components. The system achieves this by configuring multiple non-blood pumps to operate in parallel for high-volume blood flow during ECMO mode, while maintaining the capability for single-pump ECBT operations, thereby resolving the contradiction between high productivity and device complexity.
Solution Approach 2:
The patent combines multiple pump functions into a unified system where non-blood pumps designated for treatment fluid delivery are reconfigured to pump blood in parallel during ECMO mode. This merging of functions allows the system to achieve high blood flow rates (3-9 L/min) required for ECMO without requiring a completely separate high-flow pump system, thus improving productivity while managing device complexity.
2Productivity
If multiple pumps are used for parallel blood flow in ECMO mode, then the blood flow rate increases, but the calibration inaccuracies of multiple pumps accumulate
Solution Approach 1:
The patent implements feedback control through a controller that receives input from flow sensors monitoring the output of each pump. The controller dynamically adjusts pump speeds and directions to maintain precise volumetric balance, compensating for calibration inaccuracies and drift in real-time. This feedback mechanism ensures that cumulative flow measurements remain accurate even when multiple pumps operate in parallel during ECMO treatment.
Solution Approach 2:
The patent replaces reliance on mechanical pump calibration with electronic control and sensor-based measurement. Instead of depending on precise mechanical pump calibration that accumulates errors, the system uses electronic controllers with flow sensors to monitor and adjust actual flow rates, substituting mechanical precision requirements with electronic measurement and control systems that can dynamically compensate for inaccuracies.
3Productivity
If flow rates are increased for ECMO treatment, then the treatment efficacy improves, but the cumulative volumetric inaccuracies increase
Solution Approach 1:
The controller uses real-time feedback from flow sensors to dynamically adjust pump operations, ensuring that volumetric balance precision is maintained even at high flow rates. The system continuously monitors actual flow output and makes corrective adjustments, preventing cumulative inaccuracies from developing during high-volume ECMO treatment.
Solution Approach 2:
The patent employs dynamic control where pump speeds and directions are continuously adjusted based on real-time flow measurements and treatment requirements. This dynamic operation allows the system to maintain precise volumetric control across a wide range of flow rates, adapting to changing treatment needs while preventing accuracy degradation that would occur with static pump configurations.
4Ease of operation
If operator intervention is required to set pump rates for fluid balance, then the ease of operation decreases, but the flexibility to achieve desired balance is improved
Solution Approach 1:
The system implements self-service through automated controller algorithms that calculate and execute the pump rate adjustments needed to achieve desired fluid balance. The controller automatically determines the required ultrafiltration rates and coordinates multiple pumps to achieve the target balance, eliminating the need for operators to manually calculate and set complex pump rates while maintaining full adaptability to different treatment requirements.
Solution Approach 2:
The automated control system uses feedback from flow sensors and treatment parameters to dynamically adjust pump operations, achieving precise fluid balance without operator intervention. The system monitors actual flow rates and automatically makes corrections, providing both ease of operation and adaptability through intelligent automated control that responds to changing treatment conditions.
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 system enables accurate fluid balance and effective temperature management during ECMO and ECBT, supporting higher blood flow rates and reducing operator intervention, thereby improving treatment efficacy and precision.
Implementation Method 1
Each pump may be a peristaltic pump
Implementation Method 2
assisting with gas exchange with the blood in an extracorporeal blood circuit
Implementation Method 3
Toxins and electrolyte exchange across a dialyzer membrane to exchange with a treatment fluid
Implementation Method 4
any heat transfer to or from the blood can upset the patient's body temperature
Data Source
Figure 1
Figure 2A~2B
Figure 3A
AI summary
A blood treatment system employing at least two pumps for performing a low blood flow treatment is operable for high blood flow treatments such as extracorporeal membrane oxygenation (ECMO) by providing a fluid circuit with parallel blood flow paths and recruiting multiple ones of the pumps for parallel blood flow.