Implantable Antenna System Using Titanium Shielding for Wireless Communication
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Solution Overview
Problem
Active implantable medical devices face challenges in achieving reliable and efficient wireless communication due to titanium shielding, which requires antennas to be positioned outside the shielding encapsulation, limiting their efficiency and reliability in data and energy transfer.
Innovation Solution
Integration of a combined open-ended and closed-wire antenna system that operates over two separate frequency bands, enabling bidirectional communication links through a reciprocal frequency multiplexer/filter circuit, allowing simultaneous operation in the near-field and far-field regions for data and power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antennas are positioned outside titanium shielding encapsulation to avoid interference, then reliability of communication is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent embeds the antenna system within the titanium shielding encapsulation by utilizing the shielding material itself as part of the antenna structure. The antenna is positioned inside the titanium shell, and the shell is configured to work with the antenna rather than isolate it, effectively nesting the antenna within the protective enclosure while maintaining communication functionality.
Solution Approach 2:
The invention combines titanium shielding material with antenna elements to create a composite structure where the titanium shell serves dual purposes: providing protective shielding and serving as part of the antenna system. This composite approach allows the antenna to function while being protected within the titanium enclosure, resolving the contradiction between shielding and antenna performance.
2Adaptability or versatility
If single-frequency antenna systems are used, then device complexity is reduced, but adaptability to different communication standards and frequency bands is limited
Solution Approach 1:
The patent designs a universal antenna system that can operate across multiple frequency bands (e.g., low frequency for magnetic induction, high frequency for electromagnetic radiation) using a single integrated antenna structure. This multi-functional antenna eliminates the need for separate antennas for different communication standards, achieving adaptability without proportionally increasing complexity.
Solution Approach 2:
The antenna system incorporates dynamic switching capabilities that allow it to adapt its operating frequency and mode (near-field magnetic induction or far-field electromagnetic radiation) based on the communication requirements. This dynamic adjustment enables the antenna to optimize performance across different frequency bands and communication protocols.
3Adaptability or versatility
If bidirectional communication and power transfer are implemented simultaneously, then functionality is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic switching between different communication modes and frequency bands to optimize power consumption. The system alternates between low-power magnetic induction mode for near-field communication and high-power electromagnetic radiation mode for far-field communication, using periodic action to manage energy usage based on operational requirements.
Solution Approach 2:
The antenna system dynamically changes its operating parameters (frequency, mode, power level) based on the communication task at hand. For power transfer, the system operates at optimized frequencies and power levels, while for data communication it adjusts to minimize energy consumption, achieving multi-functionality with adaptive power management.
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 solution enables concurrent bidirectional data communication and power transfer over multiple frequency bands, enhancing the reliability and efficiency of wireless communication for active implantable medical devices, supporting longer autonomy and miniaturization while reducing power consumption.
Implementation Method 1
The antenna system enables wireless communication between external devices and the implantable device through electromagnetic radiation and induction mechanisms
Implementation Method 2
bidirectional communication links through a reciprocal frequency multiplexer/filter circuit, allowing simultaneous operation in the near-field and far-field regions for data and power transfer
Data Source
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Figure 2
AI summary
The present invention is related to active implantable medical devices comprising an antenna and a band diplexer connected to said antenna. The band diplexer comprises first filter means for a first signal to be transmitted and/or received in a first RF band and second filter means for a second signal to be transmitted and/or received in a second RF band. A method of bidirectional wireless communication is disclosed between an active implantable medical device and an external device, comprising the steps of: communicating unidirectionally from the external device to the implantable medical device over a first wireless link in a first RF band in the MI near-field and communicating unidirectionally from the implantable medical device to the external device over a second wireless link in a second RF band in the EM field.