Intervascular anastomoses created by an endovascular approach: technical aspects and initial results in an animal...

The current article describes the initial results after the creation of intervascular connections with use of an exclusively endovascular approach. Connections of two vessels were performed in the thoracic and abdominal areas with use of a kinematic needle without traversing a solid organ. The materials developed specifically for this technique are described.

The procedure was carried out in 11 animals and consisted of bringing together two vascular structures with use of magnets, performing a puncture from the lumen of one vessel to that of the other, and inserting a prosthesis between the two. The prosthesis has a biconical morphology and is made with a 0.016-inch monofilament of nitinol. Its most outstanding feature is that, when it is dilated with a balloon, it shortens and "rolls up," flattening its ends. This allows good fixation to the vessel wall, avoiding the protrusion of metal into the lumen of the native vessel.

On four occasions, the aorta was connected to another nearby vessel: the abdominal aorta to the inferior vena cava (IVC; n = 1), the ascending aorta to the trunk of the pulmonary artery (n = 1), and the descending aorta to the left pulmonary artery (n = 2). On another four occasions, two veins were connected: the portal vein and the IVC. Finally, on three occasions, the right pulmonary artery was connected to the superior vena cava. The connection was safely and accurately performed with passage of a guide wire in all cases. In two experiments, the prosthesis was too short and leakage with massive bleeding was observed after a successful initial deployment of the prosthesis

Intervascular anastomoses created by an endovascular approach are feasible in the authors' experimental model for several different vessel pairings.