Figure 3.

(a) Illustration of the pressure detection method used in this swine study. Intraabdominal pressure was created and manipulated by pneumoperitoneum. Then, we inserted one pressure probe into the porcine bladder to measure the intravesical pressure, one probe into the peritoneal cavity to measure the intrabdominal pressure, and a third ingestible pressure sensor into the porcine gastrointestinal tract to measure the intraluminal pressure. (b) Photograph of the animal study. The pressure detectors settled well into the porcine cavities, and wireless data was collected with external antenna receivers.