Double stent

[0033] proposed by the present invention and in figure 1 The double support generally indicated by the reference numeral 1 comprises a first inner support 2 and a second outer support 3 arranged coaxially with each other. Outer bracket 3 is slightly shorter than inner bracket 2. The entire double stent 1 is shown in the unexpanded state. Between the inner support 2 and the outer support 3 a first inner membrane 4 is arranged. The outer support 3 is surrounded by a second outer membrane 5 . Membranes 4 and 5 are both made of ePTFE.

[0034]The inner membrane 4 and the outer membrane 5 are brought together at their ends and folded inwards into the hollow space of the inner bracket 2 around the upper edge of the double bracket 1 . As an example, one of several flexible tongues 6 forming part of the inner support 2 is shown, which is bent inwardly and serves to clamp the inwardly folded edges of the membranes 4 and 5 in place.

[0035] As shown in Figure 1 , the inner stent 2 is