Trapezoidal Telemetry Antenna for Implantable Medical Devices
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Solution Overview
Problem
Implantable medical devices (IMDs) face challenges in achieving effective far-field telemetry due to space constraints, which limit the size and performance of their RF telemetry antennas, making it difficult to maintain efficient power coupling and radiation resistance.
Innovation Solution
The implementation of a trapezoidal unit structure antenna configuration within the connector header of IMDs, which allows for a non-linear configuration that increases radiation resistance and antenna impedance, enabling efficient power coupling and improved telemetry performance despite size limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna length is reduced to fit within the compact IMD housing, then the device size is reduced, but the radiation resistance and power coupling efficiency deteriorate
Solution Approach 1:
The patent transforms the traditional linear antenna configuration into a planar, two-dimensional structure that fits within the compact housing while providing sufficient electrical length. The antenna is arranged in a non-linear pattern (such as meander or spiral) that occupies minimal volume while maintaining the required electrical length for effective radiation, thus resolving the contradiction between compact size and radiation performance.
Solution Approach 2:
The patent modifies the antenna's geometric parameters (width, trace thickness, spacing, and overall layout) to optimize its electrical characteristics. By adjusting these parameters, the antenna achieves adequate radiation resistance and power coupling efficiency within the constrained space of the IMD housing, balancing miniaturization requirements with performance needs.
2Volume of moving object
If the antenna length is reduced to fit within the compact IMD housing, then the device size is reduced, but the radiation resistance deteriorates
Solution Approach 1:
The patent employs a planar antenna configuration that extends in two dimensions rather than a single linear dimension. This allows the antenna to achieve sufficient electrical length and radiation surface area within the compact housing volume, maintaining radiation resistance while satisfying the miniaturization requirement.
Solution Approach 2:
The patent utilizes the dielectric properties of the housing material itself as part of the antenna system. The housing acts as a substrate or support structure that influences the antenna's electromagnetic fields, effectively enhancing the antenna's radiation capabilities within the constrained space without requiring additional materials.
3Ease of manufacture
If conventional linear antenna configurations are used, then the manufacturing process is simple, but the far-field telemetry performance is insufficient
Solution Approach 1:
The patent transitions from a simple linear antenna layout to a planar configuration that can be easily fabricated using standard PCB or trace-based manufacturing processes. The two-dimensional arrangement maintains manufacturability while significantly improving far-field telemetry performance by providing better radiation patterns and higher radiation resistance.
Solution Approach 2:
The patent incorporates curved or rounded geometric features in the antenna design that are compatible with standard manufacturing processes. These curved elements improve the antenna's radiation characteristics and far-field performance while remaining compatible with conventional fabrication methods, thus balancing manufacturability with performance enhancement.
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 the radiation efficiency and antenna impedance, allowing for effective far-field telemetry over longer distances while maintaining compactness, thus overcoming the limitations of miniaturized antennas in IMDs.
Implementation Method 1
the driving power should be efficiently converted to maximize the far-field component generated by the antenna
Data Source
AI summary
A telemetry antenna for an implantable medical device includes one or more segments having a non-linear configuration. In some embodiments, the non-linear configuration provides an antenna having a greater antenna length than the linear lengthwise dimension of the antenna structure. In some embodiments, the non-linear configuration includes a plurality of trapezoidal unit structures.