Annular Secondary Coil Layout for Stable Wireless Animal Implants
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Solution Overview
Problem
Conventional laboratory animal biological information acquisition devices face challenges with power supply reliability, biocompatibility, cost, and operational limitations due to wired systems, non-contact power transmission inefficiencies, and increased heat generation, especially when used with multiple animals or in varying postures.
Innovation Solution
A power reception device with a secondary coil part featuring a magnetic core and annularly arranged spiral coils, allowing for efficient non-contact power transmission and biocompatibility, capable of continuous operation regardless of animal posture or position, and designed to minimize power supply fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-contact power transmission technology is used, then power supply is achieved without wires, but electromagnetic induction coupling changes with animal posture and position causing power supply failure
Solution Approach 1:
The secondary coil part is divided into multiple spiral coils (first, second, third, and fourth spiral coils) arranged in specific patterns around the magnetic core. This segmentation allows different coil segments to be activated based on the animal's posture, ensuring continuous power supply regardless of orientation.
Solution Approach 2:
The system dynamically selects which spiral coils to activate based on the detected posture and position of the laboratory animal. The control unit adjusts the induction coupling configuration in real-time to maintain optimal power transmission under varying conditions.
2Reliability
If a primary battery is built in, then power supply is achieved, but device size and weight increase reducing biocompatibility
Solution Approach 1:
The battery is extracted from the implantable device and relocated to an external power transmission device. This removes the heavy power source from the animal's body, significantly reducing device weight and improving biocompatibility while maintaining continuous power supply through wireless transmission.
3Ease of operation
If non-contact power transmission is used, then wireless operation is achieved, but heat generation increases reducing safety
Solution Approach 1:
The magnetic core is positioned centrally within the secondary coil part to concentrate and optimize the magnetic field distribution. This local optimization of magnetic field quality improves induction coupling efficiency, reducing the total energy required and thereby minimizing heat generation in the surrounding tissues.
4Reliability
If wired power supply system is used, then stable power is achieved, but animal movement is restricted
Solution Approach 1:
The mechanical wired connection system is replaced with an electromagnetic field-based wireless power transmission system. This substitution eliminates physical constraints on animal movement while maintaining stable power supply through optimized induction coupling between the external primary coil and the implantable secondary coil part.
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 reliable, continuous power supply to laboratory animals, maintaining biocompatibility and reducing heat generation, allowing for real-time data acquisition without interrupting animal movement or posture changes, and is cost-effective for multiple animal monitoring.
Implementation Method 1
supplies power to the power reception side using a non-contact power transmission technology
Implementation Method 2
the secondary coil part has a magnetic core having a circular or polygonal cross section perpendicular to the longitudinal direction and a plurality of spiral coils formed by winding a conductor
Data Source
AI summary
This is a technology for non-contact power transmission to the laboratory animal biological information acquisition device 12 embedded in the multiple laboratory animals in the breeding cage 14, and provides the power reception device, which can observe the behavior of laboratory animals from outside without covering the breeding cage 14 with the power transmission side, and which can continuously supply power regardless of the direction and position of the laboratory animals.The secondary coil part 22 includes a magnetic core 31 having a circular cross-section perpendicular to the longitudinal direction, and a plurality of spiral coils 40a and 40b formed by winding a conductor so that the outer shape is substantially rectangular. The spiral coils 40a and 40b are arranged annularly in the circumferential direction of the magnetic core 31 so that the sides (40a1 and 40b1) and (40a2 and 40b2) are close to each other so as to cover the entire circumferential surface of the magnetic core 31 (arranged to form a ring).