Eddy current-tunneling magneto-resistive sensor for micromotion detection of a tibial orthopaedic implant

Rajas P. Khokle, Fernando Franco, Susana Cardoso de Freitas, Karu P. Esselle, Michael C. Heimlich, Desmond J. Bokor

Research output: Contribution to journalArticleResearchpeer-review

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.

LanguageEnglish
Pages1285-1292
Number of pages8
JournalIEEE Sensors Journal
Volume19
Issue number4
DOIs
Publication statusPublished - 15 Feb 2019

Fingerprint

orthopedics
Orthopedics
Eddy currents
eddy currents
sensors
Sensors
Tunnel junctions
Electric network analyzers
high resolution
human body
surgery
tunnel junctions
resistors
Electromagnetic waves
Resistors
Surgery
simulators
analyzers
Signal to noise ratio
signal to noise ratios

Keywords

  • Eddy current sensor
  • Micromotion
  • Orthopedic implants
  • TMR sensor

Cite this

Khokle, Rajas P. ; Franco, Fernando ; de Freitas, Susana Cardoso ; Esselle, Karu P. ; Heimlich, Michael C. ; Bokor, Desmond J. / Eddy current-tunneling magneto-resistive sensor for micromotion detection of a tibial orthopaedic implant. In: IEEE Sensors Journal. 2019 ; Vol. 19, No. 4. pp. 1285-1292.
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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 journalArticleResearchpeer-review

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