looking more closely at the drawings and in particular fig1 to 4 showing a first embodiment of a stent graft , it will be seen that stent graft 10 has a tubular body 12 of a biocompatible material , which includes a tapered central region 14 . the tubular body is supported by stents 16 . preferably these stents are self expanding gianturco zig - zag z stents but other forms of stents may also be included or used . in the tapered region 14 , there are at least two fenestrations 18 and 20 defined by a resilient nitinol wire 22 around the periphery of the fenestration . as can be seen in fig2 , there are a pair of tubes 24 and 26 extending up from the fenestrations 18 and 20 towards the proximal end 28 of the stent graft 10 and these tubes 24 and 26 open into a single larger tube 30 which opens into the lumen 32 of the stent graft 10 . the larger tube 30 is connected by stitching 34 to the tubular body 24 and a zig - zag self - expanding stent 36 is deployed around the outside of the larger body to enable or maintain patency once deployed and released within the human or animal body . although fig1 and 2 show a pair of tubes 24 and 26 , there may be provided more than two of such tubes . fig4 shows various cross - sectional views of the stent graft shown in fig1 to 3 . a top view of the stent graft is shown in fig4 a . the stent graft tubular body 12 has the at least two tubes 24 and 26 opening into a single tube 30 and the single tube 30 is joined to the tubular wall 12 at 34 so that the tube 30 is held to one side of the tubular body . fig4 b shows a cross - sectional view at the level b shown in fig2 . the larger tube 30 is shown in section and the smaller tubes 24 and 26 can be seen extending down from it within the lumen 32 of the stent graft tubular body 12 . fig4 c shows a cross - sectional view at the level c shown in fig2 . the smaller tubes 24 and 26 can be seen in cross - section within the lumen 32 of the stent graft tubular body 12 . fig4 d shows a cross - sectional view at the level d shown in fig2 . it can be seen that the tubular body 12 is of lesser diameter because the tubular body is in the tapered portion 14 and only the tube 24 can be seen in cross - section . further distally , at the cross - section e as shown in fig4 , the tubular body is substantially circular but of lesser diameter than further up . the smaller tubes 24 and 26 could be provided with one or more self - expanding stents therein to maintain patency of the tubes once the stent graft has been deployed . now looking at fig5 to 8 , showing an alternative embodiment of a stent graft according to the present invention , it will be seen that stent graft 40 has a tubular body 12 which includes a tapered central region 44 . the tubular body is supported by stents 46 . preferably these stents are self - expanding gianturco zig - zag z stents but other forms of stents may also be included or used . in the tapered region 14 , there are at least two fenestrations 48 and 50 defined by a resilient nitinol wire 52 around the periphery of the fenestration . as can be seen in fig6 and 7 , there are a pair of tubes 54 and 55 extending up from the fenestrations 48 and 50 towards the proximal end 58 of the stent graft 40 and these tubes 54 and 55 open into a single larger tube 60 which opens into the lumen 62 of the stent graft 40 . the larger tube 60 is connected by stitching 64 to the tubular body 44 . as with the first disclosed embodiment , this embodiment could also have more than two tubes 48 , 50 . as can be particularly seen in fig7 the larger tube 60 has a zig - zag self - expanding stent 66 deployed around the outside of the larger tube to enable or maintain patency once deployed and released within the human or animal body . the smaller tubes 54 and 55 extending from the fenestrations 48 and 50 also have zig - zag self expanding stents 57 deployed around their outsides to maintain patency of these tubes once the stent graft has been deployed and released within the human or animal body . fig8 shows various cross - sectional views of the stent graft shown in fig5 to 7 . a top view of the stent graft is shown in fig8 a . the stent graft tubular body 42 has the at least two tubes 54 and 55 opening into a single tube 60 and the single tube 60 is joined to the tubular wall 42 at 64 so that the tube 60 is held to one side of the tubular body . fig8 b shows a cross - sectional view at the level b shown in fig6 . the larger tube 60 is shown in section and the smaller tubes 54 and 55 can be seen extending down from it within the lumen 62 of the stent graft tubular body 42 . fig8 c shows a cross - sectional view at the level c shown in fig6 . the smaller tubes 54 and 55 can be seen in cross - section within the lumen 62 of the stent graft tubular body 42 . fig8 d shows a cross - sectional view at the level d shown in fig6 . it can be seen that the tubular body 42 is of lesser diameter because the tubular body is in the tapered portion 44 and part of the tubes 54 and 55 can be seen in cross - section . further distally at the cross - section e as shown in fig8 the tubular body is substantially circular but of lesser diameter than further proximally . fig9 shows another embodiment of the stent graft according to the present invention . in this embodiment the stent graft has a tubular body 80 supported by stents 82 . in this embodiment there are at least three fenestrations 84 , 86 and 88 and three tubes 90 , 92 , 94 , extending from the fenestrations 84 , 86 and 88 respectively . in this embodiment the fenestrations 84 , 86 and 88 are arranged in a substantially triangular pattern . as can be seen in fig1 , the three tubes 90 , 92 and 94 open into a single larger tube 96 within the lumen 98 of the tubular body 80 . throughout this specification various indications have been given as to the scope of this invention but the invention is not limited to any one of these but may reside in two or more of these combined together . the examples are given for illustration only and not for limitation . throughout this specification and the claims that follow unless the context requires otherwise , the words ‘ comprise ’ and ‘ include ’ and variations such as ‘ comprising ’ and ‘ including ’ will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers .
a stent graft has a tubular body of a biocompatible material and at least two fenestrations . the at least two fenestrations are adjacent each other and each has a tube extending into the tubular body . the tubes are joined inside the tubular body into a single larger tube to facilitate catheterization .