Complete Cordis ISFET catheter assembly. (Photograph courtesy of Sentron, Roden, The Netherlands.)
An actual ISFET registration during spontaneous breathing is shown in figure 5. The ISFET was calibrated using a blood sample, after an initial conditioning period of half an hour, with the catheter tip in the iliac artery. The two dots are blood sample pH values for comparison with the ISFET recording. The registration shows that the ISFET measures with an accuracy within the values that can be obtained with the usual intermittent sampling technique using an off-line blood gas analyser.Complete Cordis ISFET catheter assembly. (Photograph courtesy of Sentron, Roden, The Netherlands.) An actual ISFET registration during spontaneous breathing is shown in figure 5. The ISFET was calibrated using a blood sample, after an initial conditioning period of half an hour, with the catheter tip in the iliac artery. The two dots are blood sample pH values for comparison with the ISFET recording. The registration shows that the ISFET measures with an accuracy within the values that can be obtained with the usual intermittent sampling technique using an off-line blood gas analyser.