What are the current types of prosthetic valves? There are currently two major types of prosthetic valves, one is mechanical and the other is biological. Both types of prosthetic valves have their own characteristics, advantages, and disadvantages. 1, mechanical flap: by the senior alloy stainless steel or other materials for the flap frame, mounted on the flap of each identical pyrolytic carbon activity. It has the characteristics of acid resistance, alkali resistance, high temperature resistance, more wear-resistant for its characteristics. This type of flap at home and abroad there are many models, but the basic function is the same, practice has proved that the flap work 80 years without significant wear, 110 years to see light wear marks. 2, biological flap: made of alloy stainless sodium or high-grade plastic flap frame, which is sewn on the complex chemical treatment of biological tissue membrane (such as bovine pericardium, human or civet aortic valve, etc.) as a valve. It is flexible, opens and closes flexibly, and approximates the working condition of the natural valves in the heart. Its major advantage is that it does not require lifelong anticoagulation, but only short-term anticoagulation, but its main disadvantage is that it is not as durable as mechanical valves, and some biological valves can degenerate, decay, or perforate after several years of operation, thus requiring valve replacement again. The type of prosthetic valve used must be determined by the physician based on the condition, age, general condition, and medical condition.