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US 12,508,139 B2Granted
Auxetic stents for managing venous stenosis
AssigneeOregon Health & Science University
InventorsRamsey Al-Hakim, Khashayar Farsad, John Kaufman, Craig Bonsignore
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Abstract
Stents useable for treating venous stenosis are disclosed. In embodiments, a stent is configured to be auxetic, expanding axially as it is expanded radially, to prevent the imposition of tension on portions of a blood vessel adjacent to the stented portion of the blood vessel, and thereby prevent a narrowing of the adjacent portions and improving luminal gain. The stent may include one or more cross members that are deformable axially, to allow the axial length of the stent to be adjusted while maintaining a constant diameter, and further to allow the stent to be curved to conform to vessel curvature.
Claims15
An apparatus for use in a vein, comprising:
- a first member and a second member, each of the first member and the second member comprising a single flexible junction, each flexible junction dividing each respective member into a first segment with a first segment end and a second segment with a second segment end, the first segment and the second segment of each member extending from its respective flexible junction, and each respective first and second segment ends distal from each respective flexible junction;
- a cross member with a first end connected to the first segment of the first member and a second end, distal from the first end, connected to the first segment of the second member, wherein the cross member is connected to each first segment closer to, but spaced from, each first segment's first segment end than from each member's flexible junction;
- wherein the first member, the second member, and the cross member define a cell,
- a first joining member connected to the second segment of the first member closer to, but spaced from, the first member's flexible junction than to the second segment end of the first member, extending from the first member in a first direction outside the cell;
- and
- a second joining member connected to the second segment of the second member closer to, but spaced from, the second member's flexible junction than to the second segment end of the second member, extending from the second member in a second direction outside the cell and opposing the first direction,
- wherein the cross member, the first joining member, and the second joining member are each deformable along a longitudinal axis to permit longitudinal expansion and compression of the apparatus.
4 more elements
A stent, comprising:
- a plurality of cells, each cell comprising:
- a first member and a second member, each of the first member and the second member comprising a single flexible junction, each flexible junction dividing each respective member into a first segment with a first segment end and a second segment with a second segment end, the first segment and the second segment of each member extending from its respective flexible junction, and each respective first and second segment ends distal from each respective flexible junction;
- a cross member with a first end connected to the first segment of the first member proximate to the first segment end of the first member, and a second end, distal from the first end, connected to the first segment of the second member proximate to, but spaced from, the first segment end of the second member, wherein the cross member is connected to each first segment distal from each member's flexible junction;
- a first joining member connected to the second segment of the first member proximate to, but spaced from, the first member's flexible junction and distal from the second segment end of the first member, extending from the first member in a first direction outside the cell;
- and
- a second joining member connected to the second segment of the second member proximate to, but spaced from, the second member's flexible junction and distal from the second segment end of the second member, extending from the second member in a second direction outside the cell and opposing the first direction,
- wherein the plurality of cells are interconnected to each other via one or more of each cell's first segment ends, second segment ends, first joining member, and/or second joining member to permit longitudinal expansion and compression of the stent.
4 more elements
Dependencies are inferred from the claim text.