A method of securing a flexible wrap (30) around a blood vessel (28). The wrap (30) being generally elongate and having first (30a) and second (30b) end portions. The method including the steps of 1. wrapping the flexible wrap around the blood vessel (28); 2. passing the first end (30a) of the wrap (30) through a buckle device (10) affixed substantially distally from the first end (30a) of the wrap (30); 3. adjusting the tension in the wrap (30) to a desired level by movement of the first end (30a) of the wrap (30) relative to the buckle device (10); 4. securing together adjacent parts of the wrap (30) substantially adjacent the blood vessel (28); and 5. removing the buckle device (10).