This article describes the use of the technique for connection of paravasal tissues with adventitia of a parallel-going artery to close a longitudinal defect up to 2 millimeters long in the caudal vena cava. The study was conducted on 6 male white rats. The goal of our work was to evaluate the effectiveness of haemostasis by using the method of connecting paravasal tissues of the caudal vena cava with adventitia of a parallel-running artery. All surgical interventions were performed under general anesthesia, in compliance with the rules of aseptics and antiseptics. A vessel defect was created by dissecting its paravasal tissue and the vein wall in the longitudinal direction with the tip of a 21G injection needle, then it was removed by connecting the paravasal tissue of the caudal vena cava and the aorta adventitia. For this, 2 sutures were applied by using Nylon USP 9-0 with a pricking atraumatic needle. The time taken to close the defect and the effectiveness of haemostasis were evaluated. As a result of the studies, we came to the following conclusions: the average time taken to close the defect was 3.3 ± 0.34 minutes. Unlike the classical method, we do not waste time isolating the vessel from surrounding tissues and the parallel artery, and also the suture is not placed through all layers of the vessel, causing a traumatic effect on the intima. This technique is effective for haemostasis, in five out of six cases, the blood stopped 4 minutes after the closure of the defect on the vessel. And in one of six cases, blood stopped 6 minutes after the closure of the defect.