Graft within a graft endoluminal graft

1. A segmented endograft, comprising:

at least one positioning segment defined by a positioning segment wall and including a first cylindrical section; and

at least one main body segment having a main body segment wall and including a second cylindrical section;

wherein the first cylindrical section of the at least one positioning segment and the second cylindrical section of the at least one main body segment overlap one another along an entire length of both of the first cylindrical section and the second cylindrical section along a longitudinal axis of the segmented endograft and are fixedly attached to one another at only a portion of each of a circumference of the first cylindrical section and a circumference of the second cylindrical section, but are not attached to one another at a remainder of each of the circumference of the first cylindrical section and the circumference of the second cylindrical section;

wherein the at least one positioning segment is independently deployable with respect to the at least one main body segment; and

further wherein on deployment of both the at least one positioning segment and the at least one main body segment, the at least one positioning segment and the at least one main body segment define a fluid-impervious lumen passing through the at least one positioning segment and the at least one main body segment.

2. The segmented endograft of claim 1 , wherein the at least one positioning segment and the at least one main body segment each comprise at least one stent material and at least one graft material, and the overlap comprises only at least one graft material.

3. The segmented endograft of claim 1 , wherein the main body segment wall is disposed at least partially within the positioning segment wall.

4. The segmented endograft of claim 1 , wherein on independent deployment of the at least one positioning segment, the at least one positioning segment and the at least one main body segment do not define the fluid-impervious lumen until independent deployment of the at least one main body segment.

5. An endograft delivery system, comprising:

a segmented endograft comprising at least one positioning segment defined by a positioning segment wall, said positioning segment wall including a first cylindrical portion, and at least one main body segment defined by a main body segment wall, said main body segment wall including a second cylindrical portion;

a deployment catheter configured to carry the endograft and to be endoluminally advanced through a body lumen from a remote introduction site to a site of a body lumen lesion or pathology; and

a guidewire for guiding the deployment catheter;

wherein the first cylindrical portion of the at least one positioning segment and the second cylindrical portion of the at least one main body segment overlap one another along an entire longitudinal length of each of the first and second cylindrical portions and are fixedly attached to one another at only a portion of the first cylindrical portion and the second cylindrical portion, but are not attached to one another at a remainder of each of the first cylindrical portion and the second cylindrical portion;

wherein the at least one positioning segment is independently deployable with respect to the at least one main body segment; and

further wherein only upon deployment of both the at least one positioning segment and the at least one main body segment, the at least one positioning segment and the at least one main body segment define a tight seal therebetween, and wherein upon deployment of only the at least one positioning segment and not the at least one main body segment, said tight seal is not present.

6. The endograft delivery system of claim 5 , wherein the at least one positioning segment and the at least one main body segment each comprise at least one stent material and at least one graft material, and the overlap comprises only at least one graft material.

7. The endograft delivery system of claim 5 , wherein the main body segment wall is disposed at least partially within the positioning segment wall.

8. A method for deploying a segmented endograft, comprising:

providing a segmented endograft, the segmented endograft comprising:

at least one positioning segment defined by a positioning segment wall and including a first cylindrical section; and

at least one main body segment having a main body segment wall and including a second cylindrical section;

wherein the first cylindrical section of the at least one positioning segment and the second cylindrical section of the at least one main body segment overlap one another along an entire length of both of the first cylindrical section and the second cylindrical section along a longitudinal axis of the segmented endograft and are fixedly attached to one another at only a portion of each of a circumference of the first cylindrical section and a circumference of the second cylindrical section, but are not attached to one another at a remainder of each of the circumference of the first cylindrical section and the circumference of the second cylindrical section;

wherein the at least one positioning segment is independently deployable with respect to the at least one main body segment; and

further wherein on deployment of both the at least one positioning segment and the at least one main body segment, the at least one positioning segment and the at least one main body segment define a fluid-impervious lumen passing through the at least one positioning segment and the at least one main body segment;

delivering the segmented endograft in an undeployed state from a remote introduction site to a site of a body lumen lesion or pathology;

deploying the at least one positioning segment of the segmented endograft independent of the at least one main body segment at a site distal to the body lumen lesion or pathology relative to the introduction site;

repositioning the segmented endograft as needed whereby a distal and a proximal end of the segmented endograft contact healthy body lumen tissue above and below the body lumen lesion or pathology; and

deploying the at least one main body segment of the segmented endograft whereby the at least one positioning segment and the at least one main body segment define the fluid-impervious lumen passing through the at least one positioning segment and the at least one main body segment, to provide an occlusive seal of the body lumen whereby the body lumen lesion or pathology is isolated from a flow of blood.

9. The method of claim 8 , wherein the steps of delivering the segmented endograft to the site of the body lumen lesion or pathology, deploying the at least one positioning segment, and repositioning the segmented endograft are monitored visually to confirm a proper deployment of the segmented endograft.

10. The method of claim 9 , wherein the at least one positioning segment and the at least one main body segment each comprise at least one stent material and at least one graft material, and the overlap comprises only at least one graft material.