Biased endoluminal device
An endoluminal device can comprise a flexible tubular wall and a frame member. The frame member can be comprised of a shape-memory material having sides with protrusions which are partially or substantially flattened when formed together with the flexible tubular wall to thereby create a bias in the side wall of the endoluminal device that resists deformation from a desired device profile during crush loading and is thereby resistant to invaginations when deployed.
1. An endoluminal device having an abluminal surface and a luminal surface and including a smaller diameter configuration and a larger diameter deployed configuration, the endoluminal device comprising:
a frame member having a generally frustoconical shape; and
a flexible tubular wall configured to couple or secure to the frame member to constrain the frame member from the generally frustoconical shape to a substantially cylindrical shape to create an internal structural bias relative to the luminal surface that resists inward deflection in response to transition to the smaller diameter configuration;
wherein the frame member has an outward bias when in the frustoconical shape such that one or more protrusions project radially outward from a remainder of the frame when the frame is in an unconstrained state, the one or more protrusions being compressed radially inwardly and secured toward a cylindrical shape through coupling of the flexible tubular wall to the frame member such that the frame member is in a constrained state; and
wherein the outward bias of the frame member in the constrained state exhibits an increased internal structural bias in a direction of the one or more protrusions of the frame member as defined in the unconstrained state.
2. The device of claim 1 , wherein the flexible tubular wall is fixedly secured or coupled to the frame member at a single or a plurality of locations along the abluminal or the luminal surface of the frame member.
3. The device of claim 1 , wherein the internal structural bias resists infolding or invagination of the device along a portion of the frame member having the one or more protrusions.
4. The device of claim 1 , wherein the flexible tubular wall includes one or more flexible tubular layers that are coupled to the frame member at, along or near the one or more protrusions to partially or substantially smooth, flatten, or lessen the one or more protrusions to the substantially cylindrical shape.
5. The device of claim 4 , wherein the internal structural bias is a resistance to radial deformation that varies circumferentially or peripherally about a cross-section generally normal to a longitudinal axis of the luminal surface.
6. The device of claim 5 , wherein the resistance is at a maximum at a middle portion of the frame member where the one or more flexible tubular layers are coupled to the frame member.
7. The device of claim 1 , wherein the one or more protrusions includes at least one of elevations, ridges, projections, recessions, indentations or outwardly extending features relative to the frame member in the substantially cylindrical shape.
8. The device of claim 1 , wherein the frame member is configured to resist the inward deflection relative to the luminal surface in response to a squeezing force of a radial crusher transitioning the frame member and the flexible tubular wall to the smaller diameter configuration.
9. The device of claim 8 , wherein the frame member is configured to resist inward deflection and maintain the substantially cylindrical shape.
10. A device for treatment of vascular conditions, the device comprising:
an endoluminal device having a smaller diameter configuration and a deployed configuration, the endoluminal including:
a frame member having an outward bias in a configuration having one or more protrusions spaced about a perimeter of the frame member that project radially outward from a remainder of the frame when the frame is in an unconstrained state, wherein the remainder of the frame comprises at least one additional protrusion and
a flexible tubular wall configured to couple or secure to the frame member to constrain the one or more protrusions radially inwardly to a substantially cylindrical shape such that the frame member is in a constrained state, wherein the outward bias of the frame member in the constrained state exhibits an increased structural bias that resists deflection of the device in a direction opposite that of the one or more protrusions as defined in the unconstrained state in response to transition to the smaller diameter configuration;
a sheath configured to maintain the device in the smaller diameter configuration and deploy the device to the deployed configuration without infolding or invagination.
11. The device of claim 10 , wherein the structural bias resists the infolding or invagination of the device along a portion of the frame member having the one or more protrusions.
12. The device of claim 10 , wherein the structural bias is a resistance to radial deformation that varies circumferentially or peripherally about a cross-section generally normal to a longitudinal axis of a luminal surface of the device.
13. The device of claim 12 , wherein the resistance is at a maximum at a middle portion of the frame member where one or more flexible tubular layers are coupled to the frame member.
14. The device of claim 10 , wherein the frame member is configured to resist the inward deflection in the direction opposite of the one or more protrusions in response to a squeezing force of a radial crusher transitioning the frame member and the flexible tubular wall to the smaller diameter configuration.