Fig. 6: Ex vivo demonstration of wireless intrarenal pressure sensing using the UroSleeve
From: Ureteral stent sleeve for early detection of hydronephrosis
a A representative plot from 6 ex vivo measurements with the impedance phase of the reader antenna as a function of frequency at different kidney pressures. The results show a dip in the phase due to the resonance of the UroSleeve LC tank inside the ex vivo kidney. As predicted theoretically, increasing the pressure led to a decrease in the dip/resonant frequency (as indicated by an arrow in the plot). The inset provides a detailed view of the phase dip showing gradual frequency shifts with increasing kidney pressure. b Trend of the phase-dip frequency shift as a function of kidney pressure showing a linear regression with the corresponding equation, r2 value, and the 95% confidence interval. c Image of the kidney before testing. d Image of the kidney after testing showing enlargement of the ureter and distention of the renal capsule
