Catheter Blood Pump Motor With Integrated Rotor-Stator Cooling
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Solution Overview
Problem
Existing blood pumps with modular motors have large volumes, generate significant heat, and are prone to contamination during assembly, leading to cleaning and sterilization challenges.
Innovation Solution
A compact blood pump design with a non-releasable stator and rotor connection, a small magnetic air gap, and a rinsing system to prevent contamination and heat buildup, utilizing a flexible drive shaft and a motor with a biocompatible potting compound and fluid-tight sleeve to enhance efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a modular motor design with detachable stator and rotor is used, then ease of assembly and cleaning is improved, but the volume and weight of the motor increase
Solution Approach 1:
The patent merges the stator and rotor into a single integrated motor unit with a non-releasable connection, eliminating the need for separate assembly and cleaning of detached parts while reducing overall motor volume and weight
2Ease of repair
If a modular motor design with detachable stator and rotor is used, then ease of cleaning is improved, but the volume and weight of the motor increase
Solution Approach 1:
The integrated motor design allows the entire motor unit to be cleaned as a single component, reducing the complexity of disassembly and reassembly while minimizing the volume occupied by the motor system
3Power
If a larger motor design is used, then power output is improved, but heat generation increases
Solution Approach 1:
The patent optimizes the motor's physical parameters including reducing the air gap between stator and rotor, which improves electromagnetic coupling efficiency and power density while minimizing energy losses that convert to heat
4Power
If a larger motor design is used, then power output is improved, but the weight increases
Solution Approach 1:
The patent changes the motor's dimensional parameters to achieve a compact design with reduced air gap and optimized component sizing, delivering required power output with minimal weight
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 design achieves reduced weight, minimized heat generation, and improved sterility, allowing for efficient operation with minimal patient discomfort and reduced maintenance requirements.
Implementation Method 1
The motor comprises a stator and a rotor which is rotatably mounted in the stator. The stator comprises a winding and the rotor comprises a rotor magnet.
Implementation Method 2
The stator and the rotor are non-releasably connected to one another and form a gap which is defined by the rotor and the stator
Data Source
AI summary
The invention relates to a blood pump. The blood pump comprises a flexible drive shaft guided in a catheter, a conveying element connected to the drive shaft in a distal region of the drive shaft, and a motor, wherein the motor has a stator and a rotor mounted such that it can move in the stator. The stator comprises a winding and the rotor comprises a rotor magnet. In addition, the drive shaft is connected to the rotor at a proximal end of the drive shaft. The stator and the rotor are nondetachably connected to one another, and form a gap with a ring-shaped cross-section, which is delimited by the rotor and the stator.