Multi-Directional Reflective Non-Invasive Test System for Detecting Hemoglobin Concentration After Skin Flap Transplantation

Hemoglobin concentration, as an important indicator of the recovery of the surgical site of the flap graft, can reflect the state of blood circulation. Current methods for monitoring blood flow after surgery are limited to physical observations and empirical diagnosis of skin temperature, color, and swelling, or only rough determination of oxygen saturation, and less to realtime monitoring of hemoglobin concentration. In this paper, a multi-directional reflective non-invasive test system for detecting hemoglobin concentration after skin flap transplantation was designed and constructed. Through the collection and analysis of sample data, a correction factor was introduced to achieve noninvasive detection of hemoglobin concentration. The experimental results showed that the standard deviation of 10 consecutive measurements of 6 volunteers was relatively small; the correlation between 40 measurement value and true value was relatively strong; the concentration of hemoglobin collected after skin heating was sensitive to temperature changes, indicating that the system has good stability, accuracy and effectiveness. The project team will cooperate with the Huaihe Hospital of Henan University to conduct clinical testing of hemoglobin concentration in patients after flap transplantation, further calibrate the data and develop miniaturized portable measuring instruments to provide more reliable basis for postoperative care.

I. Introduction

Hemoglobin is a protein that transports oxygen in red blood cells and is of great significance to human life activities [1]. Flap grafting is a relatively common method of skin grafting in the medical community. Flap is transfered from the flap area to the receptor, establishing a new blood supply, and guaranteeing normal blood supply to the wounded area [2]. During the entire recovery process, real-time monitoring of the growth status of the flaps is required. The hemoglobin concentration, as an important index to measure the growth status, can mainly reflect the state of blood circulation. Therefore, it is quite necessary to achieve a convenient and accurate measurement of hemoglobin concentration in the skin graft site.