Implantable Coil Modulator for Bidirectional Wireless Data
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Solution Overview
Problem
Existing wireless energy transmission systems for medical implants face challenges in reliable data transmission, particularly when the positioning between the transmitting and receiving coils is uncertain, leading to frequent adjustments and increased susceptibility to interference, which results in significant losses and safety-critical issues.
Innovation Solution
The system employs a modulated AC voltage using a pulse width modulated signal for energy regulation information and frequency modulation for other data, utilizing the existing receiving coil as a primary coil for data transmission, ensuring no additional components are needed, and using a frequency distinct from energy transmission to avoid interference, allowing for high data rates with low losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate radio channel is used for data transmission, then data transmission reliability is improved, but device complexity and susceptibility to interference increase
Solution Approach 1:
The patent combines data transmission and energy transmission functions into a single inductive coupling channel. The data signal is modulated onto the receiving coil, which simultaneously serves as both an energy receiver and a data transmitter. This eliminates the need for separate radio channels and additional antennas, reducing device complexity while maintaining reliable bidirectional communication through the existing magnetic coupling path.
Solution Approach 2:
The receiving coil is designed to perform multiple functions: it receives energy from the transmitting coil through inductive coupling and simultaneously transmits data back to the external device by modulating the magnetic field. This multi-functionality eliminates the need for dedicated separate components for data transmission, reducing overall system complexity while ensuring reliable communication through the established magnetic coupling path.
2Loss of information
If LSK method with significant load changes is used for data transmission, then data transmission is achieved, but energy losses increase
Solution Approach 1:
The patent employs frequency modulation (FM) instead of load shift keying for data transmission. By varying the frequency of the magnetic field generated by the receiving coil according to the data signal, the system achieves reliable data transmission without significant load changes. This parameter change approach maintains efficient energy transfer while enabling robust bidirectional communication through frequency variations that can be detected by the external device.
3Device complexity
If data transmission frequency is the same as energy transmission frequency, then system simplicity is maintained, but interference and reliability decrease
Solution Approach 1:
The patent segments the transmission frequencies into distinct bands: energy transmission occurs at one frequency while data transmission uses a different, higher frequency. This frequency segmentation allows the external device to separately process energy transfer and data communication signals without mutual interference, enhancing reliability while maintaining system simplicity through a unified inductive coupling mechanism that handles both functions at different frequencies.
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 approach simplifies the structure, ensures reliable data transmission with reduced interference, and maintains efficient energy transfer, addressing the limitations of existing methods by enabling secure and high-rate data communication without additional antennas or components.
Implementation Method 1
an extracorporeal transmission coil is inductively coupled to an implanted reception coil
Implementation Method 2
an implanted primary coil of the device according to the invention is electrically connected to a modulator, the modulator modulating an AC voltage supplied to the implanted primary coil according to a data signal
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Energy transmission device (10) for wireless transmission of energy to an active implant (12), comprising a transmitting coil (14) that can be electrically connected to an energy source, and an implantable receiving coil (16) that can be inductively coupled to the transmitting coil (14) for wireless energy transmission, wherein an implantable primary coil (16) is electrically connected to a modulator (18), wherein the modulator (18) modulates an alternating voltage supplied to the implantable primary coil (16) according to a data signal, such that data transmission occurs from the implantable primary coil (16) to an extracorporeal secondary coil (14), wherein the frequency of the data transmission is different from the frequency at which the energy is transmitted from the transmitting coil (14) to the receiving coil (16), characterized in thatthat information concerning the energy control of the energy to be transmitted by the transmitting coil (14) is transmitted by pulse-width modulated signal from the primary coil (16) to the secondary coil (14), and that other information not relating to energy control is transmitted by frequency modulation of the carrier frequency of the pulse-width modulated signal or by modulation of the frequency at which the pulses of the pulse-width modulated signal are sent.