Fingertip replantation is a technical challenge for microsurgeons. For successful fingertip replantation, it is important to monitor the replanted fingertip vascularity for the early detection and revision of vascular compromise. However, it has been challenging to find a reliable way to monitor the transferred flap or the replanted fingers with high sensitivity and specificity.

Compromised vascularity typically occurs within the first 2 days postoperatively, during which time the surgeons must check the viability of the transferred flap or the replanted fingers.

In the current setting of fingertip replantation, especially in cases without venous anastomosis or with unreliable vessel anastomosis, postoperative monitoring of the replanted fingertip is essential. Surgeons still rely substantially on clinical controls, such as color changes in the fingertip, changes in the temperature, capillary blink, and the pinprick test.

Pricking test is difficult to monitor post-surgery because it involves needle pricking in new replanted finger where doctors need to do pricking test in interval of 2-3 hour for 48 hours which is quite painful and hectic work for doctors.

Our device can monitor viability of new reimplanted finger without touching the patient and no need of experienced surgeon to check healing viability of finger. Our imaging technique can capture images on interval of 2-3 hour automatically for 48 hours and prepares a functional analysis report based on microvascular blood flow changes in reimplanted finger which is harmless to patients. tissue perfusion is measured in real time and recorded continuously, allowing for the rapid response to the arterial or venous occlusion to be observed. The quantification of the skin perfusion, which used to be evaluated by gross appearance, makes it possible to compare the perfusion in the transferred skin to that in the healthy skin.