**2.1 Composition and principle of Enclose II anastomotic device**

The device is composed of upper and lower rhombic mechanical jaws. The upper knob can adjust the vertical movement of the upper jaw, and it can make the upper and the lower jaws match at the anastomosis position of the ascending aorta to form a low-pressure cavity. The lower knob controls the opening and closing of the rhombic membrane at the end of the lower jaw, which makes the proximal anastomose area form a bloodless field of vision.
