Buried flaps could also be monitored by microdialysis,7 laser-Doppler flowmetry,8 or tissue oxygen monitoring. These methods are very sensitive but invasive. In this case also, there is a risk due to the need to implant a probe perforating the flap. In addition, similarly to implantable Doppler, the quality of the monitoring is very much dependent on the stability of the probe into the flap, which is sometimes difficult because of breath movements or in the neck because of deglutition. Moreover, most of these systems are expensive: in addition to the cost of the machine it is necessary to add the cost of the consumables that varies from 400 to 600 € per patient. Finally, monitoring is provided throughout the period during which the risk of vascular occlusion is the highest, i.e., four to six days following the operation, as frequently as possible—ideally continuously—but in practice every 4 to 6 h. Since the chances of recovery (reperfusion of the flap) after the occlusion are directly proportional to the rapidity of diagnosis and subsequent surgical remedial treatment, an ideal continuous monitoring of flap viability is desired. In addition, it would be beneficial for the surgeon to have an idea of the position and the depth at which the occlusion is situated so as to better evaluate the more convenient and safer intervention to do.