External Medical Antenna Layout for Metal-Cased Wireless Devices
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Solution Overview
Problem
Existing medical devices face challenges with wireless communication due to antenna placement within metal cases, leading to size increase and sub-optimal performance, and there is a need for reliable, omni-directional wireless communication for medical devices that are compact and user-friendly.
Innovation Solution
The integration of external antennas within medical devices, such as diabetes management systems, where the antenna is co-located with the delivery tube or attached to an adhesive patch, allowing for efficient communication by being capacitively or inductively coupled to the communication module, and utilizing conductive materials embedded or printed on the tube or case for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is located inside the medical device package or case, then the device structure is compact, but the wireless communication performance deteriorates due to interference and attenuation from components and packaging
Solution Approach 1:
The antenna is extracted from the internal package or case and repositioned to an external location on the medical device housing. This extraction removes the antenna from the interfering environment of internal components and packaging materials, thereby improving wireless communication performance while maintaining a compact overall device structure.
Solution Approach 2:
A dedicated antenna mounting structure or interface is introduced as an intermediary between the internal electronics and the external antenna. This intermediary provides a optimized connection point that facilitates better signal transmission while keeping the antenna positioned externally away from interfering components.
2Reliability
If the antenna is placed externally on the medical device, then wireless communication reliability improves, but the device size increases
Solution Approach 1:
The external antenna is strategically positioned on specific areas of the device housing where it can achieve optimal radiation patterns without significantly increasing the overall device footprint. The antenna is integrated into localized regions rather than requiring additional device volume, maintaining compact dimensions while improving communication reliability.
3Strength
If the antenna is integrated within the metal case for durability and water tightness, then the device protection is improved, but the wireless communication is significantly interfered with
Solution Approach 1:
The antenna is extracted from the metal case interior and positioned on the external housing surface. This extraction eliminates the harmful electromagnetic interference and signal attenuation caused by the metal enclosure, while the metal case maintains its protective function for the internal electronics and components.
Solution Approach 2:
The device is segmented into distinct functional zones: the metal case continues to provide protection for internal components, while the external housing surface is dedicated to antenna placement for optimal wireless communication. This segmentation allows each component to perform its primary function without interfering with the other.
4Reliability
If the antenna occupies significant area within the package, then wireless communication capability is achieved, but the available space for other components is reduced
Solution Approach 1:
The antenna is extracted from the internal package volume and repositioned to the external device housing. This extraction frees up significant internal space that can be utilized for other electronic components, batteries, or functional elements, while the antenna maintains its wireless communication capability on the external surface where it does not compete for internal volume.
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 smaller, more reliable wireless communication for medical devices by reducing interference and allowing for a larger radiation pattern, enhancing user convenience and device functionality.
Implementation Method 1
the antenna feed and antenna are co-located with the delivery tube. In another aspect, the antenna feed co-located with the delivery tube is capacitively coupled to the communication module in the inside space
Implementation Method 2
the antenna feed co-located with the delivery tube is inductively coupled to the communication module in the inside space
Implementation Method 3
an antenna located in the outside space configured to efficiently communicate at the first frequency... the antenna provides a transducer for wireless data communication... providing a larger radiation pattern with an omni-directional pattern
Data Source
AI summary
A medical device includes an antenna external to a case, package, or encapsulant for the electronic systems of the medical device. In one embodiment, a diabetes infusion pump is enclosed within a metal case, the pump including a processor and a communication module for wireless communications. An antenna is disposed in the delivery tubing of the pump outside the case with an antenna feed interconnecting the external antenna with the internal communication module. In another aspect, a thin film antenna is formed on the outer surface of the case in which a physiological parameter sensor, such as a glucose sensor, is enclosed. Multiple antennas may be used for communications on different frequencies.