Magnetic Drive Blood Pump for Compact Torque Delivery
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Solution Overview
Problem
Percutaneous circulatory support devices, such as blood pumps, face challenges in minimizing size while maintaining functionality, particularly in the design of motors and bearings, which affects their implantability and efficiency.
Innovation Solution
A magnetic drive system is employed, featuring a drive shaft coupled to an impeller with a driven magnet assembly and a driving coil assembly that eliminates the need for a separate motor housing, using a compact electromagnetic driving system with a permanent magnet and optimized bearing assemblies to reduce size and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional motor with separate motor housing and impeller housing is used, then the motor can provide sufficient torque, but the overall device size increases and implantability is compromised
Solution Approach 1:
The patent combines the motor housing and impeller housing into a single integrated housing structure. The motor assembly and impeller assembly share a common housing, eliminating the need for separate motor and impeller housings. This merging of components reduces the overall device volume while maintaining the necessary torque output through optimized electromagnetic drive system design.
Solution Approach 2:
The patent employs a nested arrangement where the impeller assembly is positioned within the motor assembly housing. The drive shaft extends through the motor housing to connect with the impeller, creating a compact nested configuration. This nesting approach allows the motor components to surround and support the impeller components, maximizing space utilization and minimizing overall device size.
2Volume of moving object
If the electromagnetic drive system is compacted to reduce size, then implantability improves, but heat buildup may increase
Solution Approach 1:
The patent introduces a magnetic coupling mechanism as an intermediary between the motor assembly and impeller assembly. The electromagnetic drive system uses magnetic fields to transmit rotational force without direct mechanical contact, reducing friction and heat generation. The magnetic coupling allows for efficient power transmission in a compact configuration while minimizing heat buildup through non-contact energy transfer.
Solution Approach 2:
The patent replaces traditional mechanical direct-drive systems with an electromagnetic drive system. Instead of using mechanical gears, belts, or direct shaft connections that generate friction and heat, the system uses electromagnetic fields to drive the impeller. This substitution of mechanical components with electromagnetic components reduces heat generation while maintaining compact dimensions.
3Device complexity
If the motor housing is eliminated to reduce size, then device complexity decreases, but motor performance may be compromised
Solution Approach 1:
The patent designs the single housing to serve multiple functions simultaneously. The housing provides structural support for both the motor assembly and impeller assembly, acts as a magnetic shield, serves as a fluid pathway conduit, and provides mounting surfaces for all internal components. This multi-functional design eliminates the need for separate motor and impeller housings while maintaining or enhancing motor performance through optimized component integration.
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 solution enables a more compact form factor for blood pumps, improving implantability and efficiency by minimizing heat buildup and reducing the risk of hemolysis and thrombosis, while maintaining the necessary torque output for effective blood flow.
Implementation Method 1
a driving coil assembly surrounding the driven magnet assembly and configured to drive the driven magnet assembly
Data Source
AI summary
Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that may include a magnetic drive system of a blood pump. The magnetic drive system may include a drive shaft coupled to an impeller, a driven magnet assembly coupled to at least one of the drive shaft and the impeller, and a driving coil assembly configured to drive the driven magnet assembly.