3D Electromagnetic Blood Pump Suspension for Low-Shear Rotor Control
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Solution Overview
Problem
Existing rotary blood pumps face challenges in effectively controlling the position and movement of the rotor or impeller, leading to issues such as blood damage due to hydrodynamic shearing and thrombosis caused by blood stasis, which are not adequately addressed by current suspension methods like solid bearings, magnetic levitation, or hydrodynamic suspension.
Innovation Solution
A rotary blood pump design incorporating a bearing system with permanent magnets and electromagnetic field inducing means, such as wire coils, to control the position and rotation of the rotor in three dimensions, allowing for levitation and commutation without separate components, thereby reducing complexity and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If solid bearings are used to suspend the rotor, then the structural simplicity is maintained, but blood damage due to contact and friction increases
Solution Approach 1:
The patent replaces solid mechanical bearings with a magnetic bearing system that uses electromagnetic fields to suspend and rotate the rotor. This substitution eliminates direct mechanical contact between the rotor and stator, thereby preventing blood damage caused by friction and contact while maintaining structural simplicity through the integration of electromagnetic components.
2Object-affected harmful factors
If magnetic levitation is used to suspend the rotor, then blood damage is reduced, but the device complexity increases due to additional components
Solution Approach 1:
The patent combines the magnetic levitation suspension function and the rotor drive function into a single integrated electromagnetic system. The same electromagnetic field inducing means that creates the magnetic field for suspending the rotor also provides the torque for rotation, eliminating the need for separate suspension and drive components, thus reducing device complexity while maintaining the blood damage reduction benefits.
3Object-affected harmful factors
If hydrodynamic suspension is used, then blood compatibility is improved, but control precision over rotor position deteriorates
Solution Approach 1:
The patent incorporates sensors that detect the position and rotational speed of the rotor, feeding this information back to a control system. The control system adjusts the electromagnetic field in real-time to maintain precise rotor positioning and control, achieving both blood compatibility through non-contact suspension and high control precision through active feedback control.
4Measurement precision
If separate components are used for levitation and commutation, then the control precision is improved, but the device size and complexity increase
Solution Approach 1:
The patent designs the electromagnetic field inducing means to perform multiple functions simultaneously: creating the magnetic field for magnetic levitation, providing torque for rotor rotation, and enabling commutation for precise control. This multi-functional design achieves high control precision without increasing device complexity or size, as a single integrated component system accomplishes all necessary functions.
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
This design enhances control over the rotor's position and movement, minimizing blood damage and stasis, resulting in a more efficient and reliable blood pumping mechanism.
Implementation Method 1
one or more electromagnetic field inducing means embedded in the housing; wherein the permanent magnets embedded in the rotor are influenced by the electromagnetic field inducing means embedded in the housing
Implementation Method 2
the permanent magnets embedded in the rotor are influenced by the electromagnetic field inducing means embedded in the housing for controlling the position of the rotor
Implementation Method 3
the electromagnetic field inducing means, preferably coils, are operable as commutating coils for driving rotation of the impeller and for electromagnetically positioning, such as by levitating the impeller, in three dimensions
Data Source
AI summary
The invention relates to a rotary blood pump including a housing having an internal chamber, a blood inlet port and a blood outlet port, a rotor including a plurality of blades and being adapted to rotate within the chamber. The pump includes a bearing system for controlling the position of the rotor wherein the bearing system includes one or more permanent magnets embedded in the rotor and one or more electromagnetic field inducing means embedded in the housing. The magnets embedded in the rotor are influenced by the electromagnetic field inducing means embedded in the housing for controlling the position of the rotor relative to the internal chamber of the housing and for driving rotation of the impeller within the chamber of the housing.