Application of Photon Therapy Instrument Combined With Ultrasonic Debridement in Senile Third and Fourth Stage Pressure Injuries

Inclusion Criteria: * age 55 years or older * a patient who is fully conscious (i.e., no disturbance of consciousness such as drowsiness, lethargy, or delirium; able to accurately answer questions about time, place, and person orientation; and capable of clear communication to express needs or understand study-related instructions) * patients with pressure injury were diagnosed with stage 3 or 4 pressure injury in accordance with the staging criteria of pressure injury published by the National Pressure Injury Advisory Panel (NPUAP). Exclusion Criteria: * poor blood glucose control (HbA1c \> 7.0%) * patients allergic to red-and-blue light * mental abnormalities who cannot cooperate with treatment * patients with advanced malignancies, terminal patients, patients with cachexia, and patients with severe obesity * severe complications: severe malnutrition, severe diseases of the lungs, liver, kidneys, and cardiovascular system * patients undergoing other treatments, such as Chinese medicine treatment, negative pressure aspiration therapy, platelet-rich therapy * who were unwilling to participate in the study. All participants signed a written informed consent form before the study began.