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 comprising:
a flexible tubular wall defining a lumen having a first peripheral cross-sectional shape; and
a frame member formed of at least one wire and having a second peripheral cross-sectional shape different than the first peripheral cross-sectional shape, the frame member being coupled to the flexible tubular wall to provide structural support, the second peripheral cross-sectional shape being larger than the first peripheral cross-sectional shape,
wherein the at least one wire includes a first portion of the frame member and a second portion of the frame member that is fixedly secured between layers of the flexible tubular wall to continuously bias the second portion of the frame member to form a deformed portion of the frame while the device is in an unconstrained state to resist deformation of the lumen from the first peripheral cross-sectional shape during deployment, resist infolding or invagination in a crushed state and deploy to a deployed state with no infolding or invagination, wherein the resistance to deformation varies circumferentially about a cross section normal to a longitudinal axis of the frame member;
wherein prior to the first portion of the frame member being fixedly secured to the tubular wall, the at least one wire of the frame member has a sinusoidal shape and the first portion is free from any radially outwardly extending protrusion such that the first portion of the frame member has a cross-sectional area prior to being fixedly secured to a first, corresponding portion of the tubular wall that is the same as the cross-sectional area of the first, corresponding portion of the tubular wall,
wherein prior to the second portion of the frame member being fixedly secured to a second, corresponding portion of the tubular wall, the second portion of the frame member has a sinusoidal shape and includes a radially outwardly extending protrusion that extends outwardly from a remaining portion of the frame relative to the lumen in a first configuration, such that the second portion has a cross-sectional area prior to being fixedly secured to the second, corresponding portion of the tubular wall that is larger than the cross-sectional area of the second, corresponding portion of the tubular wall, the protrusion has a length that is 5% to 25% of a diameter or width of the flexible tubular wall or the endoluminal device and the protrusion is deformed radially inwardly in a second configuration, maintaining the sinusoidal shape, by the layers of the flexible tubular wall fixedly secured thereto to create a bias and resistance to invagination of the endoluminal device that is higher along the deformed portion of the frame than the remaining portion of the frame along the cross section, the sinusoidal shape having struts between peaks and valleys.
2. The endoluminal device as set forth in claim 1 , wherein the resistance to radial deformation peaks generally at a middle portion of where the flexible tubular wall is fixedly secured to the second portion of the frame member.
3. The endoluminal device as set forth in claim 2 , wherein the resistance to radial deformation peaks at a plurality of locations circumferentially about the frame member.
4. An endoluminal device comprising:
a frame formed of at least one wire having a second peripheral cross-sectional shape being larger than a first peripheral cross-sectional shape;
a flexible tubular wall forming a first lumen having a predefined peripheral cross-sectional shape bifurcating into a second and third lumen, the flexible tubular wall being fixedly secured to the frame and deforming the frame from an initial manufactured shape such that the deformed frame resists deformation of the flexible tubular wall during deployment from a crushed state to a deployed state and is configured to resist in folding or invagination in the crush state and deploy without in folding or invagination in the deployed state, wherein the resistance to deformation varies circumferentially about a cross section normal to a longitudinal axis of the frame,
wherein the initial manufactured shape of the frame along the cross section includes a sinusoidal shape having a radially outwardly extending protrusion that extends outwardly from a remaining portion of the frame at the cross section relative to the lumen in the initial manufactured shape and has a length that is 5% to 25% of a diameter of the endoluminal device;
wherein the radially outwardly extending protrusion is deformed radially inwardly in a second configuration, maintaining the sinusoidal shape, and is fixedly secured between layers of the flexible tubular wall to create a bias and resistance to invagination of the endoluminal device that is higher along the deformed frame than the remaining portion of the frame along the cross section, the frame maintaining the sinusoidal shape in the second configuration, wherein the sinusoidal shape includes struts between peaks and valleys.
5. The endoluminal device as set forth in claim 4 , wherein the initial manufactured shape of the frame is conical.
6. The endoluminal device as set forth in claim 5 , wherein the flexible tubular wall is fixedly secured to the frame and constrains the frame toward a cylindrical shape.
7. The endoluminal device as set forth in claim 4 including an anchor extending outwardly from the frame and being proximal to the protrusion.