Figure 2From: Gas emission during laparoscopic colorectal surgery using a bipolar vessel sealing device: A pilot study on four patientsStability of the smoke sample over time and comparison to a control sample. Photoacoustic absorption spectra of smoke and control sample taken on the 26th of January. The smoke sample (1-B) was measured at three different times and compared to a control sample (1-A) which was directly retrieved from the carbon dioxide bottle.Back to article page