Implantable Antenna Lead Layout for Reliable Bluetooth Telemetry
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Solution Overview
Problem
Existing implantable medical devices face challenges in establishing reliable communication with external devices using standardized communication techniques like Bluetooth or Bluetooth Low Energy due to signal dampening by body tissue, particularly at increased frequencies, and are restricted by generator device implantation depth.
Innovation Solution
The implantable medical device incorporates an antenna lead separate from the generator device, extending outside the housing, to transmit and receive RF signals at frequencies above 400 MHz, utilizing a coaxial transmission line with a ground plane conductor and signal conductor to minimize tissue absorption losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standardized communication techniques like Bluetooth or Bluetooth Low Energy are used for communication between implantable medical device and external device, then data throughput is increased, but signal dampening due to body tissue increases at these frequencies
Solution Approach 1:
The antenna system is segmented into two separate components: a first antenna portion positioned within the implantable medical device and a second antenna portion positioned within the external device. This segmentation allows each antenna to be optimized for its specific location and function, with the implantable antenna designed to transmit signals through body tissue effectively while the external antenna is optimized for receiving signals at higher frequencies, thereby resolving the contradiction between data throughput and signal quality.
2Adaptability or versatility
If generator device is implanted at substantial implantation depth, then placement flexibility is improved, but communication connection reliability deteriorates due to tissue absorption of radio waves
Solution Approach 1:
A dedicated antenna lead serves as an intermediary element, electrically connecting the implantable antenna to the generator device housing. This antenna lead is specifically designed to extend from the housing exterior to the interior, providing a controlled transmission path for RF signals that minimizes the impact of tissue absorption. The antenna lead acts as a mediator that enables reliable communication even when the generator is implanted at substantial depths, maintaining both placement flexibility and communication reliability.
3Device complexity
If antenna is integrated inside the housing, then device complexity is reduced, but signal transmission quality deteriorates due to losses from tissue absorption
Solution Approach 1:
The antenna system transitions from a purely internal integration to a multi-dimensional configuration where the antenna lead extends both outside and inside the housing. This dimensional change allows the antenna to be positioned optimally for signal transmission while maintaining a relatively simple overall device structure. The antenna lead's dual positioning resolves the contradiction by providing external access for signal transmission without requiring complete external antenna placement, thus maintaining device simplicity while improving signal quality.
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 configuration enhances signal quality and reliability for communication with external devices, allowing placement flexibility of the generator device and enabling efficient communication using standardized protocols like Bluetooth or Bluetooth Low Energy.
Implementation Method 1
an antenna lead which is connected to and extends from the generator device, the antenna lead being operatively connected to the communication circuitry for transmitting communication signals to and/or receiving communication signals from the external device
Implementation Method 2
utilizing a coaxial transmission line with a ground plane conductor and signal conductor to minimize tissue absorption losses
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
An implantable medical device (1) comprises a generator device (10) comprising a processing circuitry (102) for controlling operation of the implantable medical device (1) and a communication circuitry (105) for establishing a communication connection to an external device (2). A housing and a connection block, wherein the connection block is mounted adjacently to the housing, and wherein the generator device is arranged inside the housing. An antenna lead (12), which is connected to and extends from the generator device (10), is operatively connected to the communication circuitry (105) for transmitting communication signals to and/or receiving communication signals from the external device (2). At least a part of the antenna lead is located outside of the connection block and outside of the housing.