Fabrication and Characterization of a Wireless Bioresorbable Pressure Sensor

Aleksi Palmroth, Timo Salpavaara, Jukka Lekkala, Minna Kellomäki

    Research output: Contribution to journalArticleScientificpeer-review

    23 Citations (Scopus)

    Abstract

    Embedding sensors into orthopedic devices can enable these implants to monitor the progress of the healing process or detect cues of complications. The simple structure of inductor–capacitor (LC) resonance sensors combined with their wireless readout offers a desirable basis for such sensors. A set of eight bioresorbable inductively coupled pressure sensors is fabricated. The conductors are formed by e-beam evaporation of magnesium (7 µm) directly onto the substrates, after which two substrates are adhered to a holed spacer to form an LC sensor. All the sensors show a fairly linear pressure response in the physiological pressure range from 0 to 200 mm Hg with an average pressure sensitivity of −6.0 ± 0.5 kHz mm Hg−1. After the pressure response tests, the effects of known error sources are determined. Finally, the sensor performance in vitro in buffer solution at +37 °C is evaluated. The sensors function tolerably for the first 8 h in immersion, after which they are disabled by mechanical changes in the sensor structure. To conclude, a bioresorbable battery-free wireless pressure sensor architecture with an adequate sensitivity for biomedical applications is described. However, further studies are required to improve the stability of the sensors under physiological conditions.

    Original languageEnglish
    Article number1900428
    Number of pages7
    JournalAdvanced Materials Technologies
    Volume4
    Issue number9
    Early online date2019
    DOIs
    Publication statusPublished - 2019
    Publication typeA1 Journal article-refereed

    Keywords

    • bioresorbable electronics
    • capacitive sensors
    • inductive coupling
    • pressure sensors
    • transient electronics

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • General Materials Science
    • Mechanics of Materials
    • Industrial and Manufacturing Engineering

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