Magnetically Suspended Ventricular Assist Impeller Control
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Solution Overview
Problem
Current non-contact ventricular assist devices suffer from low control accuracy due to communication delays between sensors and motors, affecting the precision of impeller movement and stability, which can lead to complications such as hemolysis and thrombosis.
Innovation Solution
A ventricular assist device with a housing assembly, an impeller, an electric motor, and a distance sensor, where the electric motor is located in the electric motor, and a distance sensor, which senses the distance between the impeller and the cavity wall, and the electric motor, and the electric motor, which is configured to control the magnetic force between the stator and the rotor, to control the rotation speed and distance of the impeller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If non-contact support (hydraulic levitation or magnetic levitation) is used to support the impeller, then blood compatibility is improved, but control accuracy deteriorates due to communication delays between sensor and motor
Solution Approach 1:
The patent merges the sensor and motor into a single integrated unit mounted on the impeller. This combination eliminates the need for external communication between separate sensor and motor components, thereby removing the communication delays that caused control accuracy issues while maintaining the benefits of non-contact support for blood compatibility
Solution Approach 2:
The patent introduces a magnetic coupling mechanism as an intermediary between the sensor-motor unit and the impeller. This magnetic coupling enables precise control and sensing without mechanical contact, maintaining blood compatibility while achieving high control accuracy through direct magnetic interaction
2Measurement precision
If mechanical bearings are used to support the impeller, then control accuracy is improved, but blood compatibility deteriorates due to hemolysis and thrombosis
Solution Approach 1:
The patent replaces mechanical bearings with a magnetic levitation system. The magnetic field provides contactless support and control of the impeller, eliminating mechanical friction and contact that cause hemolysis and thrombosis, thereby improving blood compatibility while maintaining control accuracy through magnetic coupling
3Reliability
If the controller adjusts motor speed based on sensor feedback with communication delay, then impeller suspension is achieved, but responsiveness deteriorates
Solution Approach 1:
By combining the sensor and motor into one integrated unit mounted directly on the impeller, the system eliminates communication delays between separate components. The integrated unit responds immediately to control signals while maintaining suspension, thereby improving responsiveness without sacrificing reliability
Solution Approach 2:
The sensor-motor unit is pre-mounted on the impeller itself, positioned to maintain optimal sensing and control capabilities during suspension. This preliminary positioning ensures that the control system is ready to respond immediately without delay, improving responsiveness while maintaining reliable suspension
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 solution provides high-precision control of the impeller, improving the precision of the impeller, enhancing the stability and responsiveness of the impeller, the responsiveness of the electric motor, and the responsiveness of the responsiveness of the responsiveness of the responsiveness of the responsiveness of the responsiveness of the impeller, ensuring the impeller is suspended and rotated with high accuracy, reducing hemolysis and thrombosis, and enhancing blood compatibility.
Implementation Method 1
a distance sensor, which senses the distance between the impeller and the cavity wall
Implementation Method 2
the electric motor, which is configured to control the magnetic force between the stator and the rotor, to control the rotation speed and distance of the impeller
Data Source
AI summary
A ventricular assist device includes a housing assembly with a pressurized inner chamber, an impeller, an electric motor and a distance sensor. The electric motor includes a controller, a stator and a rotor. The stator and the controller are located in the housing assembly, outside of the pressurized inner chamber and are electrically coupled. The impeller and the rotor are located in the pressurized inner chamber and fixedly coupled. The distance sensor is located in the housing assembly, outside of the pressurized inner chamber and electrically coupled to the controller. The distance sensor senses a distance value of the rotor to a cavity wall of the pressurized inner chamber, and further transmits the distance value to the controller. The controller controls a magnetic force between the stator and the rotor according to the distance value, so as to control a suspension and rotation of the rotor.