Deformable lumen support devices and methods of use
View Patent ↗Lumen support devices and methods of their use are provided. A lumen support includes one or more plastically deformable cells having two stable configurations with no stable configurations between the two stable configurations. The lumen support device may be plastically deformed to other stable configurations.
1. A lumen support configured to be expanded and contracted to a plurality of stable positions, the support comprising
a plurality of cells, each of the plurality of cells defined by at least a first segment and a second segment,
the cell comprising a first stable collapsed configuration, a second stable collapsed configuration, a first stable expanded configuration, and a second stable expanded configuration,
the first segment, comprising a material having an elastic range between about 0.15 to about 1% and an elongation of above 30% and an ultimate tensile strength greater than 500 MPa, the material exhibiting reduced recoil to an applied force, and
the second segment being less flexible than the first segment,
said first segment of each cell being configured to transition from a first stable collapsed configuration to a first stable expanded configuration relative to said second segment thereby causing each cell to transition from the first stable collapsed configuration to the first stable expanded configuration,
wherein said first segment is configured to plastically deform to a second stable collapsed configuration creating an area for each cell less than the area created when said first segment is at said first stable collapsed configuration, and
wherein said first segment is configured to plastically deform to a second stable expanded configuration creating an area for each cell greater than the area created when said first segment is at said first stable expanded configuration.
2. The support of claim 1 , wherein the first segment is configured to transition between collapsed and expanded configurations through an inversion point in which force is reduced in order to complete the transition.
3. The support of claim 1 , wherein the first segment has an elastic range between about 0.2 to about 0.8%.
4. The support of claim 1 , wherein the support comprises a medical device selected from the group consisting of a stent, an occlusion device, a multistable valve, an expander, a clip, a loop, and a ring.
5. The support of claim 1 , wherein the first segment substantially conforms to the shape of the second segment in the first stable collapsed configuration.
6. The support of claim 1 , wherein the second segment comprises a plastically deformable segment comprises the material of the first segment.
7. The support of claim 1 , wherein the lumen support has a smaller diameter in the plastically deformed collapsed configuration.
8. A lumen support comprising a plastically deformable structure made of a material having an elastic range between about 0.15 to about 1% and an elongation of above 30% and an ultimate tensile strength greater than 500 MPa, the structure capable of assuming an original collapsed configuration, a plastically deformed collapsed configuration, an original expanded configuration, and a plastically deformed expanded configuration, wherein no stable configurations exist between the original collapsed configuration or the original expanded configuration.
9. The support of claim 8 , wherein the structure is defined in part by a first segment and a second segment, the first segment being more flexible than the second segment.
10. The support of claim 9 , wherein the first segment is capable of transitioning between a contracted configuration and an expanded configuration, relative to the second segment, wherein the first segment passes a transition point between the contracted configuration and the expanded configuration that allows force to be decreased during the transition.
11. A lumen support comprising: a plurality of unit cells arranged in a first column and a second column, the first and second columns having a tubular shape and being interconnected by at least one flexible connector, wherein each unit cell in the first column of unit cells is coupled by first flexible articulations, and wherein each unit cell in the second column of unit cells is coupled by second flexible articulations, wherein at least some of the unit cells of the plurality of unit cells are capable of transitioning between a stable expanded configuration and a stable collapsed configuration by application of a force through an inversion point of decreased force and wherein the plurality of unit cells comprises a material having an elastic range between about 0.15 to about 1% and an elongation of above 30% and an ultimate tensile strength greater than 500 MPa.
12. The support of claim 11 , wherein the lumen support further comprises one or more unit cells.
13. The support of claim 12 , wherein the one or more unit cells comprises a first segment and a second segment, the first segment being more pliable than the second segment.
14. The support of claim 11 , wherein first flexible articulations and the flexible connector are configured to allow one or more unit cells of the first column to conform to a lumen.
15. The support of claim 11 , wherein the material is a cobalt alloy.