Figure 1.

Test of the tethered sensor system in vivo. (a) Prototype of the tethered sensor system. It comprises a data logger connected to a sensor probe at the tip of which is mounted the sensor element (b) Sensor element. (c) Suprapubic catheter placement for implantation of the pressure sensor probe in the urinary bladder. (d) Transcardiac implantation of the sensor probe. (e) Response of the sensor system when pressure is manually applied to the lower abdominal area at the level of the urinary bladder. (f) Intraoperative monitoring of arterial blood pressure from the hindlimb metatarsal artery by a conventional clinical system. (g) Intracardiac pressure recording by the tethered sensor system. (e) Sensor output demonstrating the loss of intracardiac pressure upon sacrificing of the pig. Of note, (g) and (h) were obtained from experiments in different pigs, using distinct sensor probes.