"What? You say you want to modify the prosthetic valve? ”

Yun Yi was choked several times by a sip of tea after hearing her daughter's bold idea, and Xie Yuzhen, who was cutting medicinal herbs next to her, also turned her head in surprise, but she just asked, "What are you going to do?" ”

Yun Ling sat down, took a piece of paper, and said while writing: "Artificial valves are still mainly divided into two types, one is mechanical and the other is biological. Other materials such as titanium alloy and stainless steel are mainly used in mechanical valves......

Chapter 73 The prosthetic valve is being hit by hand, please wait a moment,

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