title: A touch probe method of operating an implantable RFID tag for orthopedic implant identification.
abstract: The major problem in operating an implantable radio-frequency identification (RFID) tag embedded on an orthopedic implant is low efficiency because of metallic interference. To improve the efficiency, this paper proposes a method of operating an implantable passive RFID tag using a touch probe at 13.56 MHz. This technology relies on the electric field interaction between two pairs of electrodes, one being a part of the touch probe placed on the surface of tissue and the other being a part of the tag installed under the tissue. Compared with using a conventional RFID antenna such as a loop antenna, this method has a better performance in the near field operation range to reduce interference with the orthopedic implant. Properly matching the touch probe and the tag to the tissue and the implant reduces signal attenuation and increases the overall system efficiency. The experiments have shown that this method has a great performance in the near field transcutaneous operation and can be used for orthopedic implant identification.
authors.affiliation: Electrical and Computer Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA. xil56@pitt.edu
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Liu
authors.forename: J Lee
authors.initials: JL
authors.lastname: Berger
authors.forename: Ajay
authors.initials: A
authors.lastname: Ogirala
authors.forename: Marlin H
authors.initials: MH
authors.lastname: Mickle
mesh_terms: D000465:Algorithms; D000818:Animals; D004567:Electrodes, Implanted; D004582:Electronics, Medical; D020342:Finite Element Analysis; D006801:Humans; D008670:Metals / Q000737:chemistry; D009985:Orthopedics / Q000379:methods*; D019736:Prostheses and Implants; D011474:Prosthesis Design; D057233:Radio Frequency Identification Device; D011846:Radio Waves; D012815:Signal Processing, Computer-Assisted; D012965:Sodium Chloride / Q000737:chemistry; D013552:Swine
chemical_list: D008670:Metals; D012965:Sodium Chloride