title: Miniaturizing RFID for magnamosis.
abstract: Anastomosis is a common surgical procedure using staples or sutures in an open or laparoscopic surgery. A more effective and much less invasive alternative is to apply the mechanical pressure on the tissue over a few days [1]. Since the pressure is produced by the attractive force between two permanent magnets, the procedure is called magnamosis[1]. To ensure the two magnets are perfectly aligned during the surgery, a miniaturized batteryless Radio Frequency IDentification (RFID) tag is developed to wirelessly telemeter the status of a pressure sensitive mechanical switch. Using the multi-layer circular spiral coil design, the diameter of the RFID tag is shrunk to 10, 15, 19 and 27 mm to support the magnamosis for children as well as adults. With the impedance matching network, the operating distance of these four RFID tags are longer than 10 cm in a 20 × 22 cm(2) area, even when the tag's normal direction is 45° off the antenna's normal direction. Measurement results also indicate that there is no noticeable degradation on the operating distance when the tag is immersed in saline or placed next to the rare-earth magnet. The miniaturized RFID tag presented in this paper is able to support the magnamosis and other medical applications that require the miniaturized RFID tag.
authors.forename: Hao
authors.initials: H
authors.lastname: Jiang
authors.forename: Shijie
authors.initials: S
authors.lastname: Chen
authors.forename: Shad
authors.initials: S
authors.lastname: Kish
authors.forename: Lokkee
authors.initials: L
authors.lastname: Loh
authors.forename: Junmin
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiaorong
authors.initials: X
authors.lastname: Zhang
authors.forename: Dillon
authors.initials: D
authors.lastname: Kwiat
authors.forename: Michael
authors.initials: M
authors.lastname: Harrison
authors.forename: Shuvo
authors.initials: S
authors.lastname: Roy
mesh_terms: D006801:Humans; D007422:Intestines / Q000601:surgery; D010535:Laparoscopy; D059346:Magnets; D057233:Radio Frequency Identification Device / Q000379:methods*; D017792:Surgical Stapling / Q000295:instrumentation*