Stent and stent-graft for treating branched vessels
View Patent ↗An implantable stent and stent-graft for treating a patient having a relatively healthy first aorta portion upstream from a renal artery branch, and a diseased aorta portion downstream from the renal artery branch. One embodiment of the device includes a fixation section, a renal artery branch section and a diseased aorta section, all of which can be tubular, radially compressible and self-expandable structures formed from a plurality of filaments which are helically wound in a braided configuration. When the device is implanted and in its expanded state, the fixation section engages the first aorta portion upstream from a renal artery branch to provide substantial anchoring support. The diseased aorta section engages the portion of the aorta downstream from the renal artery branch and extends across the diseased portion of the aorta for purposes of treatment. The renal artery branch section extends across the renal artery branch and connects the diseased aorta section to the fixation section while allowing blood flow between the aorta and renal artery branch.
1. An implantable medical device for treating a section of a patient's vessel having a vessel branch, a relatively healthy first vessel portion on a first side of the vessel branch, and a diseased vessel portion on a second side of the vessel branch, including:
a fixation section having a first porosity;
a diseased section having a second porosity and a diseased section length; and
a branch section comprising a supportive structure having a third porosity which is greater than the second porosity and a branch section length which is less than said diseased section length.
2. The implantable medical device of claim 1 wherein the branch section includes a plurality of filaments extending between the fixation section and the diseased section.
3. The implantable medical device of claim 2 wherein the filaments of the branch section are helically wound in a braided configuration to form a tubular, radially compressible and self-expandable structure.
4. The implantable medical device of claim 2 wherein a free state diameter of the fixation section is equal to a free state diameter of the branch section.
5. The implantable medical device of claim 2 wherein a radial pressure of the fixation section is greater than a radial pressure of the branch section.
6. The implantable medical device of claim 1 wherein the radial pressure of the fixation section is greater than a radial pressure of the diseased section.
7. The implantable medical device of claim 1 wherein the third porosity is greater than the first porosity.
8. An implantable medical device for treating a section of a patient's vessel having a vessel branch, a relatively healthy first vessel portion on a first side of the vessel branch, and a diseased vessel portion on a second side of the vessel branch, including:
a fixation section comprising a plurality of filaments which are helically wound in a braided configuration to form a tubular, radially compressible and self-expandable structure having a first porosity,
a diseased section comprising a plurality of filaments which are helically wound in a braided configuration to form a tubular, radially compressible and self-expandable structure having a second porosity, said diseased section having a diseased section length and
a branch section comprising a supportive, radially compressible and expandable structure having a third porosity which is greater than the second porosity, and a branch section length which is less than said diseased section length.
9. The implantable medical device of claim 8 wherein the branch section includes a plurality of filaments extending between the fixation section and the diseased section.
10. The implantable medical device of claim 9 wherein the filaments of the branch section are helically wound in a braided configuration to form a tubular, radially compressible and self-expandable structure.
11. The implantable medical device of claim 9 wherein a free state diameter of the fixation section is equal to a free state diameter of the branch section.
12. The implantable medical device of claim 9 wherein a radial pressure of the fixation section is greater than a radial pressure of the branch section.
13. The implantable medical device of claim 8 wherein the radial pressure of the fixation section is greater than a radial pressure of the diseased section.
14. The implantable medical device of claim 8 wherein the third porosity is greater than the first porosity.
15. An implantable medical device for treating a section of a patient's vessel having a vessel branch, a relatively healthy first vessel portion on a first side of the vessel branch, and a diseased vessel portion on a second side of the vessel branch, including:
a fixation section having a first porosity;
a diseased section having a second porosity; and
a branch section comprising a supportive structure having a third porosity which is greater than the second porosity;
wherein a radial pressure of the fixation section is greater than a radial pressure of the diseased section.
16. An implantable medical device for treating a section of a patient's vessel having a vessel branch, a relatively healthy first vessel portion on a first side of the vessel branch, and a diseased vessel portion on a second side of the vessel branch, including:
a fixation section comprising a plurality of filaments which are helically wound in a braided configuration to form a tubular, radially compressible and self-expandable structure having a first porosity,
a diseased section comprising a plurality of filaments which are helically wound in a braided configuration to form a tubular, radially compressible and self-expandable structure having a second porosity, and
a branch section comprising a supportive, radially compressible and expandable structure having a third porosity which is greater than the second porosity;
wherein a radial pressure of the fixation section is greater than a radial pressure of the diseased section.