Implant Housing Window Layout for Wireless Power and EMI Control
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Solution Overview
Problem
In-vivo implantable medical devices face challenges with electromagnetic interference and thermal effects due to increased radio wave energy for wireless power supply and radio communication, leading to device size issues and patient burden.
Innovation Solution
A compact in-vivo implantable medical device design incorporating a power receiving coil, magnetic sheet, and radio communication antenna, with a housing made of biocompatible materials, uses different frequency bands for wireless power reception and radio communication, employing near and far fields to minimize electromagnetic interference and thermal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the radio communication antenna is placed inside the housing and the power receiving coil is placed outside the housing to suppress electromagnetic interference, then electromagnetic interference between wireless power supply and radio communication is suppressed, but the device size increases and cannot be miniaturized
Solution Approach 1:
The patent combines both the radio communication antenna and power receiving coil within the housing, eliminating the need to place components outside the housing. This integration enables device miniaturization while maintaining electromagnetic interference suppression through careful spatial arrangement and frequency separation.
Solution Approach 2:
The patent utilizes different frequency dimensions for radio communication and wireless power reception. By operating in distinct frequency bands (e.g., 2.4GHz for communication and 13.56MHz for power transfer), the system suppresses electromagnetic interference without requiring physical separation that would increase device size.
2Reliability
If radio wave energy is increased to enable stable communication, then communication stability is improved, but thermal effects in vivo increase
Solution Approach 1:
The patent optimizes radio wave parameters including frequency selection, power level control, and pulse modulation to achieve stable communication at lower energy levels. By carefully tuning these parameters, the system maintains communication reliability while minimizing thermal effects in the biological environment.
3Adaptability or versatility
If multiple functions and multiple channels are implemented in in-vivo implantable medical devices, then device functionality is improved, but power consumption increases and battery replacement becomes necessary
Solution Approach 1:
The patent implements a dual-frequency system where the same hardware components (antenna and coil) serve multiple functions. The antenna handles both communication and power reception at different frequencies, eliminating the need for separate batteries and reducing overall power consumption while maintaining versatile functionality.
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 miniaturization of the device while suppressing electromagnetic interference and thermal effects, allowing for efficient wireless power reception and radio communication without excessive power consumption, thereby reducing patient burden.
Implementation Method 1
The power receiving coil and a power receiving resonance capacitor constitute a power receiving resonance circuit, are located in the internal space of the housing, form an electromagnetic resonance field that interacts with a magnetic field outside the housing, and perform wireless power reception
Implementation Method 2
form an electromagnetic resonance field that interacts with a magnetic field outside the housing, and perform wireless power reception
Implementation Method 3
The magnetic sheet forms a magnetic circuit in a magnetic field for the power receiving coil
Data Source
AI summary
A housing of an in-vivo implantable medical device includes a window including a nonmetallic biocompatible material that enables formation of an electromagnetic resonance field and radio communication. In plan view of the housing, an outer shape of the window is larger than an outer shape of a power receiving coil. An outer shape of a magnetic sheet is larger than the outer shape of the power receiving coil to form a magnetic circuit that serves as a main magnetic flux that forms an electromagnetic resonance field to obtain power for the power receiving coil. A radio communication antenna is at a position where the main magnetic flux does not intersect. An outer shape of the radio communication antenna has an area of 1/100 or less of the outer shape of the power receiving coil.