The osteofascial compartment syndrome is a common syndrome in orthopedics clinical practice. The body fluid pressure is the key indicator of the need for surgery. The traditional needling pressure measurement method is traumatic, single-point, and wired, which is very inconvenient in practice. As a promising alternative measurement method, anon-invasive, multi-point, and wireless flexible wearable pressure measurement sensor was proposed in this work. The sensor has 7 flexible pressure measurement units to realize multi-point measurement. The units were fabricated by unique printing electronics technology, with high precision and flexibility. ZigBee protocol was used for real-time wireless data transmission. A35.9mm*56.6mm flexible printed circuit board(FPCB)was designed and optimized for the pressure readout and wireless communication. The FPCB was powered by a small 3V button battery. Typical specifications of the sensor are as follows: sensing unit size 10*4 mm; measurement range [0, 100] N; measurement precision 2.5 N; maximum wireless transmission distance50 m; maximum bending radius 2 mm. Further optimization and experiments, including animal experiments, are in progress.
The silver nanoparticle (AgNP) based conducting wire is a fundamental element of flexible electronic devices, especially in the printing electronics area. Its resistance change mechanisms under pressure is of both scientific interest and practical importance. AgNP-based conducting wires were fabricated on flexible substrates by electrospraying printing technology, and three possible resistance change mechanisms were studied: vertical deformation (VD) of the AgNP wire due to vertical pressure, horizontal wire elongation (HWE) along with the flexible substrate due to vertical pressure, and local micro deformation (LMD) at the touching edge. Analysis of the experiment data revealed that the resistance change due to VD was negligible, the resistance change due to PWE was one order of magnitude smaller than the measured value, and the resistance change due to PWE was the dominating mechanism.
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