Continuous-Flow Centrifuge Rotation Control for Stable Hematocrit
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Solution Overview
Problem
Existing blood processing systems face challenges in maintaining consistent separation efficiency and hematocrit of packed red blood cell products due to variations in blood inflow rate during centrifugation, leading to inaccurate yields and longer procedure times.
Innovation Solution
A fluid processing device with a controller that adjusts the rotation rate of a continuous-flow centrifuge in response to changes in blood inflow rate, based on fluid component concentration, inflow rate, and target concentrations, using an interface monitoring assembly to maintain optimal separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotation rate of the centrifuge remains constant during a separation procedure, then the device operation is simple, but the separation efficiency and hematocrit of the separated packed red blood cell product vary when the inflow rate changes
Solution Approach 1:
The centrifuge rotation rate is made dynamic rather than constant. The controller continuously adjusts the rotation rate based on real-time monitoring of the inflow rate to the centrifuge chamber. This dynamic adjustment ensures that separation efficiency and hematocrit remain substantially constant even when inflow conditions change during the procedure.
Solution Approach 2:
A feedback control system is implemented where the controller monitors the actual inflow rate to the centrifuge chamber and uses this information to adjust the rotation rate. This closed-loop feedback mechanism maintains optimal separation conditions by compensating for variations in blood delivery rate from the pump system.
2Manufacturing precision
If the rotation rate of the centrifuge is adjusted dynamically in response to inflow rate changes, then the separation efficiency remains constant, but the device complexity increases
Solution Approach 1:
The controller receives input signals representing the actual inflow rate to the centrifuge chamber and automatically adjusts the rotation rate accordingly. This feedback mechanism ensures consistent hematocrit values in the separated packed red blood cell product by compensating for inflow variations without requiring manual intervention or complex external monitoring systems.
Solution Approach 2:
The centrifuge system performs self-adjustment of its rotation rate based on monitored inflow conditions. The controller automatically modifies operational parameters to maintain optimal separation performance, eliminating the need for external oversight or manual recalibration during the procedure.
3Adaptability or versatility
If the inflow rate to the centrifuge chamber varies during the procedure, then the pump system can adapt to venous flow changes, but the separation efficiency and product quality deteriorate
Solution Approach 1:
The system uses feedback control where the controller monitors the actual inflow rate to the centrifuge chamber and adjusts the rotation rate to compensate for variations. This allows the pump system to adapt to venous flow changes while the centrifuge maintains consistent separation efficiency through dynamic rotation rate adjustment.
Solution Approach 2:
The rotation rate parameter of the centrifuge is changed dynamically in response to inflow rate variations. By adjusting this critical operational parameter, the system maintains optimal separation conditions despite changes in blood delivery rate, ensuring consistent product quality.
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
Ensures consistent separation efficiency and hematocrit throughout the procedure, resulting in more accurate yields and reduced processing time by dynamically adjusting centrifuge rotation rates.
Implementation Method 1
the centrifuge is configured to receive and rotate a continuous-flow centrifuge chamber of a fluid flow circuit so as to separate a fluid in the centrifuge chamber into at least first and second constituents
Implementation Method 2
a pump system configured to convey the fluid through the fluid flow circuit and into the centrifuge chamber at first and second rates
Data Source
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AI summary
A fluid processing device includes a controller, a centrifuge, and a pump system. The controller controls the pump system to convey a fluid into a centrifuge chamber received by the centrifuge at first and second rates, with the controller also controlling the centrifuge to rotate the chamber at a first rotation rate when the fluid is being conveyed into the chamber at the first rate and controlling the centrifuge to rotate the chamber at a second rotation rate when the fluid is being conveyed into the chamber at the second rate. The first and second rotation rates are different, with each being based at least in part on a concentration of a fluid component within the fluid, the rate at which the pump system is conveying the fluid into the centrifuge chamber, and a target concentration of the fluid component in one of the first and second constituents.