A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic Applications
A promising approach for monitoring and predicting the course of bone fracture healing is by measuring the mechanical load-sharing between the healing callus and the implanted fixation hardware. Previous technologies have used implantable sensors which require modification to the fixation hardware a...
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| Format: | Article |
| Language: | English |
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IEEE
2018-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/8516913/ |
| _version_ | 1818877209813712896 |
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| author | Kevin M. Labus Branislav M. Notaros Milan M. Ilic Conor J. Sutherland Amy Holcomb Christian M. Puttlitz |
| author_facet | Kevin M. Labus Branislav M. Notaros Milan M. Ilic Conor J. Sutherland Amy Holcomb Christian M. Puttlitz |
| author_sort | Kevin M. Labus |
| collection | DOAJ |
| description | A promising approach for monitoring and predicting the course of bone fracture healing is by measuring the mechanical load-sharing between the healing callus and the implanted fixation hardware. Previous technologies have used implantable sensors which require modification to the fixation hardware and may carry long term biocompatibility risks. The objective of this paper was to optimize and evaluate a method of externally sensing hardware load-sharing based on the electromagnetic near field effects of a radio-frequency antenna. A series of parametric experiments was conducted to optimize the dimensional parameters of a coaxial dipole antenna to improve the antenna’s sensitivity to displacement of a metal plate. The results of the parametric tests guided the design of an optimized antenna, including a coiled loop antenna structure. The antenna was then evaluated for its efficacy in sensing the displacement of a metal plate as well as the deflection of an orthopaedic fracture fixation plate due to an applied load via physical experiments and computational simulations. The antenna’s resonant frequency was sensitive to the displacement of a metal plate, and followed an inverse-square relationship with plate distance. The antenna was also able to sense the bending deflection of the mechanically loaded fracture plate, with the resonant frequency following an approximately linear relationship with applied load. Computational finite-element electromagnetic predictions closely matched the experimental data. This method of sensing plate deflections may be effective for measuring the mechanical load sharing in fractured bones in order to monitor and predict the course of fracture healing. |
| first_indexed | 2024-12-19T13:54:39Z |
| format | Article |
| id | doaj.art-79637090e8fe4822975d3b8fda1132b6 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-19T13:54:39Z |
| publishDate | 2018-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-79637090e8fe4822975d3b8fda1132b62022-12-21T20:18:38ZengIEEEIEEE Access2169-35362018-01-016681846819410.1109/ACCESS.2018.28789048516913A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic ApplicationsKevin M. Labus0Branislav M. Notaros1https://orcid.org/0000-0002-5755-961XMilan M. Ilic2https://orcid.org/0000-0003-4196-3594Conor J. Sutherland3Amy Holcomb4Christian M. Puttlitz5Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, USADepartment of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO, USASchool of Electrical Engineering, University of Belgrade, Belgrade, SerbiaDepartment of Mechanical Engineering, Colorado State University, Fort Collins, CO, USADepartment of Mechanical Engineering, Colorado State University, Fort Collins, CO, USADepartment of Mechanical Engineering, Colorado State University, Fort Collins, CO, USAA promising approach for monitoring and predicting the course of bone fracture healing is by measuring the mechanical load-sharing between the healing callus and the implanted fixation hardware. Previous technologies have used implantable sensors which require modification to the fixation hardware and may carry long term biocompatibility risks. The objective of this paper was to optimize and evaluate a method of externally sensing hardware load-sharing based on the electromagnetic near field effects of a radio-frequency antenna. A series of parametric experiments was conducted to optimize the dimensional parameters of a coaxial dipole antenna to improve the antenna’s sensitivity to displacement of a metal plate. The results of the parametric tests guided the design of an optimized antenna, including a coiled loop antenna structure. The antenna was then evaluated for its efficacy in sensing the displacement of a metal plate as well as the deflection of an orthopaedic fracture fixation plate due to an applied load via physical experiments and computational simulations. The antenna’s resonant frequency was sensitive to the displacement of a metal plate, and followed an inverse-square relationship with plate distance. The antenna was also able to sense the bending deflection of the mechanically loaded fracture plate, with the resonant frequency following an approximately linear relationship with applied load. Computational finite-element electromagnetic predictions closely matched the experimental data. This method of sensing plate deflections may be effective for measuring the mechanical load sharing in fractured bones in order to monitor and predict the course of fracture healing.https://ieeexplore.ieee.org/document/8516913/Antenna for orthopaedic applicationantenna resonant frequencycomputational electromagnetic simulationscoaxial dipole antennaelectromagnetic sensorexternal sensing of object displacement and deflection |
| spellingShingle | Kevin M. Labus Branislav M. Notaros Milan M. Ilic Conor J. Sutherland Amy Holcomb Christian M. Puttlitz A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic Applications IEEE Access Antenna for orthopaedic application antenna resonant frequency computational electromagnetic simulations coaxial dipole antenna electromagnetic sensor external sensing of object displacement and deflection |
| title | A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic Applications |
| title_full | A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic Applications |
| title_fullStr | A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic Applications |
| title_full_unstemmed | A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic Applications |
| title_short | A Coaxial Dipole Antenna for Passively Sensing Object Displacement and Deflection for Orthopaedic Applications |
| title_sort | coaxial dipole antenna for passively sensing object displacement and deflection for orthopaedic applications |
| topic | Antenna for orthopaedic application antenna resonant frequency computational electromagnetic simulations coaxial dipole antenna electromagnetic sensor external sensing of object displacement and deflection |
| url | https://ieeexplore.ieee.org/document/8516913/ |
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