Blood Pump Drive With Magnetic Thrust for Axial Stability
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Solution Overview
Problem
Intravascular blood pumps experience significant wear and instability due to the interaction between the stationary and rotating portions, affecting their service life and reliability.
Innovation Solution
A driving device with a housing assembly, rotating shaft, rotor, and stator configuration that utilizes magnetic thrust forces to stabilize the rotating shaft and reduce wear by using thrust members and flywheels to limit axial movement, combined with a stator that generates a rotating magnetic field to drive the rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a stationary portion and rotating portion are used in the driving device, then the impeller can be driven to rotate, but great wear occurs between the stationary and rotating portions, affecting service life and reliability
Solution Approach 1:
The patent replaces the traditional mechanical contact-based driving mechanism with a magnetic field-based driving mechanism. The stator generates a magnetic field that interacts with the rotor to produce rotational motion, eliminating direct mechanical contact between stationary and rotating portions. This substitution of mechanical system with electromagnetic system resolves the wear problem while maintaining driving capability.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the stationary stator and the rotating rotor. The magnetic field acts as a mediator that transmits force without requiring direct physical contact, thereby eliminating wear between the stationary and rotating portions while still enabling effective power transmission to drive the impeller.
2Power
If a stationary portion and rotating portion are used in the driving device, then the impeller can be driven to rotate, but the rotating portion moves unstably, affecting reliability
Solution Approach 1:
The patent replaces mechanical contact-based rotation control with magnetic field-based control. The magnetic field provides smooth, contactless actuation that eliminates mechanical friction and instability associated with traditional bearing and seal systems, thereby improving rotational stability while maintaining driving capability.
3Stability of the object's composition
If magnetic thrust force is used to enable the thrust member to abut against the limiting surface, then axial movement is limited and stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the thrust generation function with the existing magnetic driving system. The same magnetic field that drives rotor rotation also generates axial thrust force that presses the thrust member against the limiting surface. This integration of multiple functions into a single magnetic system achieves axial stability without proportionally increasing device complexity.
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 enhances the stability and reliability of the blood pump by reducing wear and axial vibrations, thereby extending the service life and improving performance.
Implementation Method 1
the stator is capable of generating a magnetic thrust force against the rotor, and the magnetic thrust force enables the thrust member to abut against the limiting surface
Implementation Method 2
a stator configured to drive the rotor to rotate, wherein the stator is capable of generating a magnetic thrust force against the rotor
Data Source
AI summary
Provided are a driving apparatus and a blood pump. The driving apparatus comprises a housing assembly, a rotating shaft, a rotor, a thrust member, and a stator. The housing assembly is provided with a limiting surface; the rotating shaft is rotatably mounted on the housing assembly; the rotor is fixedly connected to the rotating shaft; the thrust member is fixedly connected to at least one of the rotating shaft and the rotor, the thrust member, the limiting surface and the rotor are arranged in the axial direction of the rotating shaft, the thrust member is located between the limiting surface and the rotor, and the thrust member can abut against the limiting surface; the stator can generate a magnetic thrust on the rotor such that the thrust member abuts against the limiting surface.