Vascular anastomosis device

A vascular anastomosis device, comprising:

• a vascular fastener, comprising a first ring and a second ring, wherein the first ring is provided with a first groove, the second ring is provided with a first projection, and the first groove corresponds to the first projection;
• a vascular fastening mechanism, wherein the vascular fastener is disposed in the vascular fastening mechanism and the vascular fastening mechanism comprises:
• a first tube, wherein a first end of the first tube is connected to a second tube;
• a vascular supporting unit, disposed at the other end of the second tube opposite to the end connected to the first tube, wherein the vascular supporting unit comprises a vascular supporting body and a vascular spreader, and the vascular spreader is assembled on the vascular supporting body;
• an advancing ring, wherein the first ring, the second ring, and the advancing ring are disposed on the second tube and between the vascular supporting unit and the first end, the second ring is located between the first ring and the advancing ring, the first ring is located between the vascular supporting unit and the second ring, and the advancing ring is located between the second ring and the first end;
• a third tube, disposed in the first tube and protruding from the first end, wherein the second tube, the first ring, the second ring and the advancing ring are disposed in the third tube;
• and a spreading unit, disposed in the third tube, wherein one end of the spreading unit is adjacent to the vascular spreader.