Blood Pump Rotor Coating for Magnet Corrosion Isolation
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Solution Overview
Problem
Percutaneous circulatory support devices face issues with corrosion of magnetic materials due to exposure to blood and fluids, leading to cytotoxicity and hemolysis of red blood cells, which can worsen patient outcomes.
Innovation Solution
Implementing a corrosion-resistant coating on the outer surface of magnetic components and integrating them within a protective fluid chamber to minimize contact with bodily fluids, using materials like amorphous silicone, diamond-like coatings, and polymeric compounds to protect the magnets from corrosion and hemolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetic materials (Neodymium and/or iron) are used in percutaneous circulatory support devices, then the motor functionality is achieved, but corrosion occurs due to exposure to blood and fluids
Solution Approach 1:
A corrosion-resistant coating is applied to the magnetic rotor components, serving as an intermediary barrier between the magnetic materials and the corrosive blood environment. This coating allows the motor to function while preventing direct contact between blood and the magnetic materials.
Solution Approach 2:
The patent uses composite material structures where magnetic materials are combined with corrosion-resistant coating materials. This creates a composite component that maintains the magnetic functionality while adding corrosion protection properties.
2Ease of operation
If magnetic materials are exposed to blood and fluids, then motor operation is maintained, but cytotoxicity and hemolysis occur
Solution Approach 1:
The corrosion-resistant coating acts as a protective intermediary layer that prevents direct interaction between magnetic materials and blood cells, thereby eliminating cytotoxicity and hemolysis while maintaining motor operation.
Solution Approach 2:
The patent converts the potentially harmful exposure of magnetic materials to blood into a beneficial protected interface, where the coating material itself becomes the safe interacting surface that maintains motor function without causing biological harm.
3Productivity
If surface shear is high in exposed spinning elements, then pump function is achieved, but red blood cell hemolysis increases
Solution Approach 1:
The corrosion-resistant coating serves as a protective intermediary on the spinning rotor surfaces, allowing high surface shear to be maintained for pump function while preventing direct mechanical stress on red blood cells from the magnetic material surface.
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 effectively prevents corrosion and cytotoxicity, ensuring the longevity and safety of percutaneous circulatory support devices by reducing the risk of hemolysis and maintaining device functionality.
Implementation Method 1
a corrosion-resistant coating disposed on the outer surface of the driven magnet
Implementation Method 2
a stator disposed adjacent the rotor and configured to drive the rotor, causing the rotor to rotate
Implementation Method 3
a motor configured to drive the stator
Data Source
AI summary
A blood pump includes an impeller; a drive shaft coupled to the impeller and configured to rotate with the impeller; and a rotor coupled to the drive shaft and configured to rotate with the drive shaft. The rotor includes a driven magnet having an outer surface. A corrosion-resistant coating may be disposed on the outer surface of the driven magnet. A stator is disposed adjacent the rotor and configured to drive the rotor, causing the rotor to rotate; and a motor is configured to drive the stator. A protection assembly may be disposed adjacent the stator and configured to receive an end of the drive shaft, and may include a protection assembly housing enclosing a protective fluid chamber, the protective fluid chamber including the driven magnet and at least a portion of a bearing configured to engage the end of the drive shaft.