Instability Detection Algorithm for Implantable Blood Pump Rotor
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Solution Overview
Problem
Implantable blood pumps face challenges with high current consumption and peak currents during startup due to the need for significant currents to release the rotor from magnetic attraction, which can lead to instability and increased power requirements.
Innovation Solution
An instability detection algorithm is implemented in the blood pump system, using a controller to determine a target position for the rotor with reduced power consumption, calculating positional displacements, and generating instructions for translational movement to initiate rotation only when the rotor is within a predetermined volume, thereby reducing current consumption and peak currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If significant currents are applied to release the rotor from magnetic attraction during startup, then the rotor can be activated, but current consumption and peak currents increase significantly
Solution Approach 1:
The system performs preliminary positioning of the rotor to a target position before activation, where the rotor is first translated to a position within a predetermined volume using translatory instructions, then activated only when positioned correctly. This preliminary positioning action reduces the current required for activation by ensuring the rotor is already near the optimal position.
Solution Approach 2:
The patent replaces the traditional mechanical/electromagnetic approach of using high currents to directly activate the rotor with a control algorithm that uses positional feedback and conditional logic. The controller monitors rotor position, calculates geometric deviations, and generates translatory instructions to move the rotor to a target position before activation, substituting computational control for brute-force electromagnetic activation.
2Productivity
If the rotor is activated without precise positioning, then activation may occur, but instability and restarts increase
Solution Approach 1:
The system implements a feedback mechanism where the controller continuously determines the current position of the rotor, calculates geometric deviations from the target position, and generates translatory instructions based on this feedback. The activation command is issued only when the rotor position feedback indicates it is within the predetermined volume, ensuring stability before activation.
Solution Approach 2:
The controller performs preliminary positioning actions by generating translatory instructions to move the rotor to the target position before activation. This preliminary action ensures the rotor is properly positioned and stable before the activation command is issued, preventing instability and restarts during operation.
3Reliability
If traditional startup algorithms are used, then the rotor can be activated, but the power supply requirements increase due to heavyweight power supplies
Solution Approach 1:
The patent changes the operational parameters of the rotor activation process by introducing positional control parameters. Instead of directly applying high currents for activation, the system first controls the rotor position parameters, translating it to a target position within a predetermined volume before activation. This parameter change allows for lower current consumption and eliminates the need for heavyweight power supplies.
Solution Approach 2:
The control algorithm substitutes the traditional high-power electromagnetic activation mechanism with a positional control system. The controller uses geometric deviation calculations and generates translatory instructions to position the rotor before activation, replacing the need for heavyweight power supplies with a computational control approach that requires less power.
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 algorithm stabilizes rotor rotation, reduces current consumption, and minimizes the number of restarts, thereby avoiding high current peaks and improving the efficiency and reliability of the blood pump operation.
Implementation Method 1
the rotor having permanent magnetic poles for magnetic levitation of the rotor
Implementation Method 2
calculating, during a rotation of the rotor, geometric deviations of a current position of the rotor from the target position
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An instability detection algorithm for an implantable blood pump may include determining a target position of a rotor of the pump, the rotor having permanent magnetic poles for magnetic levitation of the rotor, calculating a positional displacement of the target position from a predefined origin of a coordinate system of a housing of the pump, and calculating, during a rotation of the rotor, geometric deviations of a current position of the rotor from the target position.