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0.1 ml of blood might be insignificant. But it can lead to blindness in eye surgery and hemiplegia, even death, in brain surgery. Our scalpel uses a laser-Doppler sensor to monitor the blood perfusion. When perfusion amount exceeds the preset value, there will be a flashlight to remind the doctor as soon as possible to avoid relatively large blood vessels. It can effectively reduce the patient's blood loss in the operation, and improve the success rate of surgery at the same time.