Far-field RF Antenna on Implantable Device Case Side
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Solution Overview
Problem
Implantable medical devices (IMDs) face attenuation issues with short-range RF communications due to the conductive case material, which affects data transmission efficiency, especially at higher frequencies like Bluetooth, and is exacerbated by the patient's tissue, making it difficult to integrate a short-range RF antenna within the IMD's header due to space constraints and conductive components.
Innovation Solution
The IMD features a short-range RF antenna positioned externally on the case side, away from the conductive case and header, using dielectric materials to prevent shorting and attenuation, allowing for unobstructed communication and reserving space for lead connectors, with a serpentine or monopole design optimized for specific frequencies and insulated with a dielectric overcoat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a short-range RF antenna is integrated within the IMD's header, then data communication capability is provided, but communication reliability deteriorates due to attenuation from conductive case material and tissue
Solution Approach 1:
The patent extracts the short-range RF antenna from the IMD header and places it externally on the case side. This removes the antenna from the problematic environment of conductive materials and tissue attenuation, significantly improving communication reliability while maintaining integration through external mounting.
Solution Approach 2:
The patent introduces dielectric materials as intermediaries between the antenna and conductive surfaces. These dielectric layers prevent shorting and reduce attenuation by isolating the antenna from the conductive case and tissue, thereby improving signal quality and communication reliability.
2Productivity
If a short-range RF antenna is positioned externally on the case side, then communication range and efficiency are improved, but device space is reduced
Solution Approach 1:
The patent moves the antenna from the internal three-dimensional space of the header to the external two-dimensional surface of the case side. This dimensional transition allows the antenna to operate in a more favorable electromagnetic environment without consuming valuable internal volume, thus improving communication efficiency while preserving device compactness.
3Reliability
If dielectric materials are used to prevent shorting, then antenna performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs thin dielectric films or coatings as simple barriers between the antenna and conductive surfaces. These thin-layer solutions provide effective electrical isolation and performance improvement while adding minimal manufacturing complexity, as they can be applied through standard coating or lamination processes.
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 data communication reliability and reduces IMD size by eliminating internal data antennas, improving communication range and efficiency while maintaining header space for lead connectors.
Implementation Method 1
Dielectric materials keep the antenna from shorting to the case and to the patient's tissue
Implementation Method 2
a far-field short-range radio-frequency antenna positioned on a side of the case
Data Source
AI summary
An Implantable Medical Device (IMD) is disclosed having a bi-directional short-range far-field Radio-Frequency (RF) data antenna, operable in accordance with a short-range RF standard such as Bluetooth for example. The antenna is neither located inside the conductive case of the IMD, nor in the non-conductive header of the IMD that includes the lead connectors. Instead, the antenna is outside of the case, proximate to and generally planar with a flat planar side of the case that faces outward of the patient when the IMD is implanted. Dielectric materials keep the antenna from shorting to the case and to the patient's tissue. Because the antenna is not located within the conductive case, data communications to and from the antenna are less subject to attenuation. Not locating the antenna in the header reserves room for the header's lead connectors, thus simplifying IMD design.