To the Editor,

We would like to thank the commentators for their interest in our paper [1]. EVARS as described in our report uses the standard 2 stent EVAS system as the basis for repair of a complex aneurysm with additional support of standard EVAR iliac limbs. This is a practical combination based on the conventional use of existing technologies; EVARS described by us, currently, is only an option to treat difficult anatomy rather than a further endovascular revolution.

Bi et al. propose the development of a system using a single endobag around a bifurcated stent termed EVARS [2, 3]. There are potential attractions to such a proposal in the avoidance of type 2 endoleaks and possibly in conformability to difficult-shaped aortic necks. However, there would be difficulties deploying such a bifurcated device, which would have to be in one piece for filling of the single endobag, in contrast to all commercially available EVAR devices. In addition, in our experience with EVAS, the second endobag has avoided difficulties when one endobag fails to fill properly due to constraints within calcified iliac vessels.

We wish Bi et al. well in their development of this new device and would be keen to look at it on completion.