Centrifugal Blood Pump Rotation Drive Using Flexible Substrate Wiring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In small-size rotation drive devices, such as those used in centrifugal pumps, there is a challenge in securing space for wiring due to dimensional restrictions, leading to poor working efficiency, assembling workability, productivity, and reliability, especially with soldering between wiring lines in clearance portions.
Innovation Solution
A rotation drive device with a rotor and a drive unit that includes magnetic elements, coils, and a flexible substrate with a wiring pattern for supplying driving voltage, allowing for efficient connection and reducing the size of the apparatus while maintaining high assembling workability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldering is used for wiring connections in clearance portions, then electrical connection is achieved, but assembling workability and reliability deteriorate due to poor working efficiency and dimensional restrictions
Solution Approach 1:
The patent replaces the mechanical soldering process with a magnetic coupling system. The drive unit uses magnetic attraction forces to transmit rotational force from the motor to the impeller without physical contact or soldering, eliminating the need for complex wiring connections in clearance portions. This substitution of mechanical connection with magnetic field interaction resolves the contradiction by improving both reliability (no solder joints to fail) and assembling workability (no soldering process required).
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the motor and impeller. Instead of direct mechanical connection through soldered wiring, the magnetic field acts as a mediator to transmit rotational force across the clearance portion. This intermediary approach allows reliable force transmission without requiring precise mechanical alignment or soldering operations, thereby improving both reliability and ease of manufacture.
2Volume of moving object
If the apparatus size is reduced, then space is saved, but wiring space becomes insufficient leading to poor working efficiency
Solution Approach 1:
The patent replaces extensive wiring systems with a magnetic coupling mechanism. By using magnetic fields to transmit rotational force directly across the dividing wall, the system eliminates the need for complex wiring channels and connections that would consume valuable space in compact apparatus. This substitution enables miniaturization while maintaining high working efficiency through direct magnetic coupling between the motor and impeller.
Solution Approach 2:
The patent transitions from three-dimensional wiring pathways to a two-dimensional magnetic field interaction across the dividing wall. The magnetic coupling operates through the thickness of the dividing wall, utilizing the axial dimension rather than requiring radial or circumferential wiring space. This dimensional shift enables compact apparatus design without compromising working efficiency, as the magnetic field penetrates the dividing wall directly to transmit rotational force.
3Length of moving object
If dimensional restrictions are imposed, then apparatus compactness is achieved, but assembling workability deteriorates
Solution Approach 1:
The patent replaces precision mechanical assembly requiring soldering and wiring routing with a magnetic coupling system. The magnetic drive unit can be assembled by simply positioning the motor and impeller on opposite sides of the dividing wall, with the magnetic field automatically establishing the coupling. This eliminates complex assembly steps constrained by dimensional restrictions, thereby improving assembling workability while maintaining apparatus compactness.
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 enables high-speed rotation of the rotor with large torque generation and enhanced energy efficiency while maintaining small dimensions, improving assembling workability and reliability.
Implementation Method 1
a plurality of coils wound around the plurality of first magnetic elements, respectively, for generating rotating magnetic field
Implementation Method 2
Owing to attractive force acting on the one surface of the impeller from the electromagnet, attractive force acting on the other surface of the impeller from the permanent magnet in the rotor
Implementation Method 3
a groove for hydrodynamic bearing is formed in a surface of the second dividing wall facing the other surface of the impeller. Owing to attractive force acting on the one surface of the impeller from the electromagnet, attractive force acting on the other surface of the impeller from the permanent magnet in the rotor, and a hydrodynamic bearing effect of the groove for hydrodynamic bearing, the impeller moves away from an inner wall of the second chamber and rotates without contacting
Data Source
AI summary
This centrifugal blood pump apparatus includes an impeller (10) provided in a blood chamber (7), and a plurality of coils (20) provided in a motor chamber (8) for driving the impeller (10) to rotate with a dividing wall (6) interposed therebetween. A flexible substrate (23) in the shape of a strip is arranged to surround outer circumferences of the plurality of coils (20), and is connected to the plurality of coils (20) and a connector (24). A driving voltage (VU, VV, VW) is externally supplied to the plurality of coils (20) via the connector (24) and the flexible substrate (23). Thus, assembling workability, productivity and reliability are improved.