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. 2020 Dec 4;6(49):eabe1655. doi: 10.1126/sciadv.abe1655

Fig. 4. Evaluations of a wireless 3D pressure sensor and a reference device performed with a DMA and with a compression stocking mounted on the legs of healthy volunteers.

Fig. 4

(A) Photograph of a wireless sensor and a reference sensor (PicoPress, Microlab) of pressure. Changes in the resistance of the 3D sensor and response of the reference equipment as a function of pressure on a (B) flat rigid surface, (C) flat elastic surface, and (D) curved elastic surface with different materials [elastomers with different elastic modulus; Dragon Skin 10 (E = 137 kPa), Ecoflex 00-50 (E = 83 kPa), and Ecoflex 00-30 (E = 69 kPa)]. (E) Schematic illustration of eight measurement points across the leg. Measured changes in pressure and resistance on the leg of a healthy volunteer using a compression stocking at pressures of (F) 15 to 20 mmHg and (G) 20 to 30 mmHg. Pressure measurement using the SCV and the reference equipment during (H) resting, (I) walking and running, and (J) cycling with speeds of 60 and 120 rpm. Photo credit: Yoonseok Park, Northwestern University.