Journal
ADVANCED MATERIALS TECHNOLOGIES
Volume 4, Issue 9, Pages -Publisher
WILEY
DOI: 10.1002/admt.201900428
Keywords
bioresorbable electronics; capacitive sensors; inductive coupling; pressure sensors; transient electronics
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Funding
- Business Finland as a part of the Human Spare Parts research program
- Finnish Cultural Foundation's Kalle and Dagmar Valimaa fund
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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 mu m) 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 degrees 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.
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