Axial Flow Pump Speed Control for Pressure-Flow Simulation
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Solution Overview
Problem
Current ventricular assist devices, particularly continuous flow pumps, face challenges in modulating pressure-flow characteristics to match the responsiveness of centrifugal flow pumps, limiting their ability to adapt to physiological changes effectively.
Innovation Solution
A method and controller system that adjust the speed of the motor in axial flow pumps based on flow rate, pressure differential, and power consumption to simulate target pressure-flow characteristics, allowing the pump to operate on a specified power-speed relation and achieve desired H-Q curves, effectively mimicking the characteristics of centrifugal flow pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial flow pumps are used to reduce size and improve reliability, then pump size and reliability are improved, but the ability to modulate pressure-flow characteristics and match physiological responsiveness deteriorates
Solution Approach 1:
The patent applies dynamics by making the pump speed variable rather than fixed. The controller dynamically adjusts the motor speed based on real-time measurements of flow rate and pressure differential, allowing the axial flow pump to adapt its pressure-flow characteristics to match physiological conditions. This dynamic speed adjustment enables the pump to simulate the responsiveness of centrifugal flow pumps while maintaining the size and reliability advantages of axial flow design.
2Productivity
If pump speed is increased to improve flow rate, then flow rate is improved, but power consumption increases
Solution Approach 1:
The patent implements feedback control by continuously measuring the actual flow rate and pressure differential across the pump, then using this information to adjust the motor speed. The controller receives feedback from flow and pressure sensors and modifies the pump operation accordingly, optimizing the balance between flow rate delivery and power consumption. This closed-loop control ensures the pump operates efficiently across varying physiological conditions.
3Device complexity
If the pump operates at fixed speed to simplify control, then device complexity is reduced, but the ability to respond to physiological changes deteriorates
Solution Approach 1:
The control system uses feedback from flow rate and pressure differential measurements to automatically adjust pump speed, enabling physiological responsiveness without requiring complex manual control mechanisms. The feedback loop processes sensor data and modulates motor speed accordingly, achieving adaptability through automated control rather than complex mechanical systems.
Solution Approach 2:
The patent replaces complex mechanical speed adjustment mechanisms with electronic control. Instead of using mechanical variable speed drives or complex valve systems, the invention uses electronic motor control based on electrical signals from sensors, simplifying the overall device architecture while maintaining the ability to respond to physiological changes.
Data Source
AI summary
Blood pump systems including a continuous flow blood pump and methods for controlling a continuous flow blood pump operate the blood pump to simulate target pressure-flow characteristics that are different from native pressure-flow characteristics of the blood pump. A method for controlling a continuous flow blood pump driven by a motor includes operating the motor at a first rotational rate. A first flow rate of the continuous flow blood pump driven at the first rotational rate is measured and/or estimated. The first flow rate is used to determine a second rotational rate based on target pump characteristic data corresponding to target pressure-flow characteristics for the continuous flow blood pump different from pressure-flow characteristics of the continuous flow blood pump when driven by the motor at a constant rotational speed. The second rotational rate is different from the first rotational rate. The motor is then operated at the second rotational rate.