1, the definition is different: mc is also called midline catheter, and its catheter is placed in clinical medicine to guide catheter puncture. Mc is a catheter inserted into the upper arm through the basilic vein, cephalic vein, median elbow vein or brachial vein, while cvc is mainly inserted into the large-diameter superior and inferior vena cava through the internal jugular vein, subclavian vein and femoral vein for a certain period of time.

2. Different scope of application: mc is used in situations that require rapid fluid replacement, infusion of blood vessel-irritating liquid, and difficulty in peripheral vein puncture. And cvc can be used in cases that need long-term repeated infusion treatment.