Design of a miniaturized bone implantable antenna for a wireless implant monitoring device

Khokle, Rajas; Heimlich, Michael; Bokor, Desmond

doi:10.1049/cp.2017.0254

Cited by 5 publications

(3 citation statements)

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“…Furthermore, its effect on the sensitivity and range of the sensor will have to be evaluated. To provide the energy to the sensor and for communication with the external interrogator, a miniaturized bone implantable antenna has to be designed and tested [ 46 ].…”

Section: Future Directionsmentioning

confidence: 99%

Design, Modeling, and Evaluation of the Eddy Current Sensor Deeply Implanted in the Human Body

Khokle

Bokor

2018

Sensors

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Joint replacement surgeries have enabled motion for millions of people suffering from arthritis or grave injuries. However, over 10% of these surgeries are revision surgeries. We have first analyzed the data from the worldwide orthopedic registers and concluded that the micromotion of orthopedic implants is the major reason for revisions. Then, we propose the use of inductive eddy current sensors for in vivo micromotion detection of the order of tens of μm. To design and evaluate its characteristics, we have developed efficient strategies for the accurate numerical simulation of eddy current sensors implanted in the human body. We present the response of the eddy current sensor as a function of its frequency and position based on the robust curve fit analysis. Sensitivity and Sensitivity Range parameters are defined for the present context and are evaluated. The proposed sensors are fabricated and tested in the bovine leg.

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Section: Future Directionsmentioning

confidence: 99%

Design, Modeling, and Evaluation of the Eddy Current Sensor Deeply Implanted in the Human Body

Khokle

Bokor

2018

Sensors

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“…Implantable antennas are employed in many biomedical applications such as temperature monitoring, cancer detection, tumor detection, orthopedic monitoring, glucose monitoring, digestive monitoring, capsule endoscopy, etc. [1][2][3][4][5][6]. In [7][8][9], compact dual and triple frequency bands rectangular-shape implantable antennas were proposed.…”

Section: Introductionmentioning

confidence: 99%

Modeling of a Compact Dual Band and Flexible Elliptical-Shape Implantable Antenna in Multi-Layer Tissue Model

2022

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A flexible antenna of compact size with a dual band elliptical-shape implantable is designed for biomedical purposes. The suggested antenna has an elliptical shape to be more comfortable for being implanted in human tissue. The implantable antenna is printed on RO3010 substrate with 2 mm as a thickness and 10.2 as a dielectric constant. It consists of an active planar C-shaped element and a parasitic planar inverted C-shaped element. The proposed antenna is designed with a major axis radius of 12 mm and a minor axis radius of 8 mm . It operates in dual bands: The Industrial Scientific and Medical band (ISM) [2.4 GHz–3.5 GHz] and Medical Implant Communications Service band (MICS) [394 MHz–407.61 MHz]. A short-circuited pin is used to minimize the antenna’s overall size and for further size reduction a capacitive load is used between the radiator and the ground plane. For biocompatibility, a thin-thickness layer of Alumina is used as a superstrate. The suggested antenna is tested in a multi-layer tissue model and the Specific Absorption Rate (SAR) value is computed. The proposed antenna was fabricated, and the reflection coefficient is measured and compared with simulated results.

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“…Implantable antennas have gathered remarkable attention due to their importance in the medical and engineering field. These implantable devices are used for many kinds of medical applications such as tumor detection, wireless health monitoring, various cancer detection, speech sensing, self‐monitoring, digestive monitoring, 1 retinal implants, 2 cardioverter defibrillators and pacemakers, 3 temperature monitoring, 4 and orthopedic monitoring device 5,6 . Majorly it is reducing delay in hospitals with help of remote health monitoring system which has reduced face to face consultation 7 .…”

Section: Introductionmentioning

confidence: 99%

A metamaterial‐inspired circularly polarized antenna for implantable applications

Goswami¹,

Karia²

2020

Engineering Reports

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A novel microstrip-fed metamaterial-inspired antenna is proposed for implantable applications. The designed antenna operates in the Industrial, Scientific and Medical band at a frequency (2.4-2.5) GHz. The implantable antenna comprises of two split ring resonators. The use of metamaterial not only dramatically reduces the size of the antenna, but also improves its gain and bandwidth. Different methods of size reduction with optimum gain and bandwidth are here discussed in detail. The implantable antenna is designed using FR4 substrate which provides better gain, miniature size (84% size reduction), good impedance matching, circular polarization with 3.41% of 3-dB axial ratio bandwidth. Circularly polarized antennas are usually preferred as they reduce polarization mismatch loss. The antenna is 29 × 28 mm 2 in size with 4.86 dB gain and 140 MHz impedance bandwidth. The design of phantom liquid, the computation of its pH value, and measurement of its permittivity are thoroughly reported. The permittivity of the liquid is found to increase with the pH value. The permittivity of phantom liquid has been validated with 85070E dielectric probe kit. A detailed description of different probes is provided. The measurement results are in good agreement with simulations. Finally, the design of phantom for implantable applications and techniques for size reduction of the same have been described. This reduced size will help to fit antenna in medical devices, providing greater ease for the body movement. K E Y W O R D S implantable antenna, metamaterial (split ring resonator), phantom design 1 INTRODUCTION Implantable antennas have gathered remarkable attention due to their importance in the medical and engineering field. These implantable devices are used for many kinds of medical applications such as tumor detection, wireless health monitoring, various cancer detection, speech sensing, self-monitoring, digestive monitoring, 1 retinal implants, 2 cardioverter defibrillators and pacemakers, 3 temperature monitoring, 4 and orthopedic monitoring device. 5,6 Majorly it is reducing This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Design of a miniaturized bone implantable antenna for a wireless implant monitoring device

Cited by 5 publications

References 0 publications

Design, Modeling, and Evaluation of the Eddy Current Sensor Deeply Implanted in the Human Body

Design, Modeling, and Evaluation of the Eddy Current Sensor Deeply Implanted in the Human Body

Modeling of a Compact Dual Band and Flexible Elliptical-Shape Implantable Antenna in Multi-Layer Tissue Model

A metamaterial‐inspired circularly polarized antenna for implantable applications

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