Abstract
In this paper, an eddy current loop coupled with the tunneling magneto resistor (EC-TMR) is used as a displacement sensor to detect the micromotion of an orthopaedic implant. The high sensitivity and signal to noise ratio of the TMR sensor are used to achieve high resolution at a large standoff distance. First, a small three-turn rectangular eddy current loop of dimension 2.5 mm × 10 mm is designed and simulated inside the human body using a full-wave EM simulator. Then, it is fabricated and tested using vector network analyzer. The magnetic tunnel junction stack is optimized and a six-element TMR sensor is fabricated and characterized. The eddy current and tunnelling magneto resistive sensor are integrated and heterodyne detection technique is used to obtain the high-resolution micromotion detection at an extended standoff range. This technique can be used for in-vivo detection of the micromotion of the orthopaedic implant which will be useful in reducing the revision surgeries due to the mechanical failures of the implant.
| Language | English |
|---|---|
| Pages | 1285-1292 |
| Number of pages | 8 |
| Journal | IEEE Sensors Journal |
| Volume | 19 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 15 Feb 2019 |
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Keywords
- Eddy current sensor
- Micromotion
- Orthopedic implants
- TMR sensor
Cite this
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Eddy current-tunneling magneto-resistive sensor for micromotion detection of a tibial orthopaedic implant. / Khokle, Rajas P.; Franco, Fernando; de Freitas, Susana Cardoso; Esselle, Karu P.; Heimlich, Michael C.; Bokor, Desmond J.
In: IEEE Sensors Journal, Vol. 19, No. 4, 15.02.2019, p. 1285-1292.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Eddy current-tunneling magneto-resistive sensor for micromotion detection of a tibial orthopaedic implant
AU - Khokle, Rajas P.
AU - Franco, Fernando
AU - de Freitas, Susana Cardoso
AU - Esselle, Karu P.
AU - Heimlich, Michael C.
AU - Bokor, Desmond J.
PY - 2019/2/15
Y1 - 2019/2/15
N2 - In this paper, an eddy current loop coupled with the tunneling magneto resistor (EC-TMR) is used as a displacement sensor to detect the micromotion of an orthopaedic implant. The high sensitivity and signal to noise ratio of the TMR sensor are used to achieve high resolution at a large standoff distance. First, a small three-turn rectangular eddy current loop of dimension 2.5 mm × 10 mm is designed and simulated inside the human body using a full-wave EM simulator. Then, it is fabricated and tested using vector network analyzer. The magnetic tunnel junction stack is optimized and a six-element TMR sensor is fabricated and characterized. The eddy current and tunnelling magneto resistive sensor are integrated and heterodyne detection technique is used to obtain the high-resolution micromotion detection at an extended standoff range. This technique can be used for in-vivo detection of the micromotion of the orthopaedic implant which will be useful in reducing the revision surgeries due to the mechanical failures of the implant.
AB - In this paper, an eddy current loop coupled with the tunneling magneto resistor (EC-TMR) is used as a displacement sensor to detect the micromotion of an orthopaedic implant. The high sensitivity and signal to noise ratio of the TMR sensor are used to achieve high resolution at a large standoff distance. First, a small three-turn rectangular eddy current loop of dimension 2.5 mm × 10 mm is designed and simulated inside the human body using a full-wave EM simulator. Then, it is fabricated and tested using vector network analyzer. The magnetic tunnel junction stack is optimized and a six-element TMR sensor is fabricated and characterized. The eddy current and tunnelling magneto resistive sensor are integrated and heterodyne detection technique is used to obtain the high-resolution micromotion detection at an extended standoff range. This technique can be used for in-vivo detection of the micromotion of the orthopaedic implant which will be useful in reducing the revision surgeries due to the mechanical failures of the implant.
KW - Eddy current sensor
KW - Micromotion
KW - Orthopedic implants
KW - TMR sensor
UR - http://www.scopus.com/inward/record.url?scp=85056729820&partnerID=8YFLogxK
U2 - 10.1109/JSEN.2018.2881957
DO - 10.1109/JSEN.2018.2881957
M3 - Article
VL - 19
SP - 1285
EP - 1292
JO - IEEE Sensors Journal
T2 - IEEE Sensors Journal
JF - IEEE Sensors Journal
SN - 1530-437X
IS - 4
ER -