Intraluminal devices configured for directional expansion
Methods and devices useful, for example, in the field of angioplasty and stenting are disclosed. In some embodiments, the methods, devices and kits are configured for directional expansion inside a lumen, for example of a blood vessel obstructed by plaque. In some embodiments, the directional expansion displaces the plaque in a desired direction.
1. An expandable intraluminal medical device for directional displacement of a lesion within a lumen of a blood vessel, comprising:
a vascular balloon catheter consisting of an elongate balloon having a tapered end and a substantially rectilinear end conjoined by a central section wherein the substantially rectilinear end is conjoined to the central section at an angle of about 90°, said elongate balloon having one region of decreasing balloon material thickness extending from and including said substantially rectilinear end to and including said tapered end thereby providing a lesser resistance to expansion at said tapered end than at said substantially rectilinear end, such that the elongate balloon is controllably directionally expandable from said tapered end through regions of lesser resistance through regions of greater resistance through to the substantially rectilinear end; and
a balloon-expandable stent demountably engaged thereon the vascular balloon catheter wherein a proximal end of the stent is positioned at the substantially rectilinear end of the elongate balloon and at least a portion of the tapered end extends beyond a distal end of the stent;
said device having a proximal end, a distal end, and a central section, wherein said device is configured for controlled directional expansion within the lumen of a blood vessel to thereby controllably displace the lesion toward a selected direction within the lumen of the blood vessel from the tapered end to the substantially rectilinear end of the device, wherein said lesion is one of a plaque or a thrombus or thrombi or combinations thereof.
2. The device of claim 1 , wherein the tapered end of the balloon comprises said distal end, such that the resistance to the controlled directional expansion increases from said distal end to the proximal end and said directional expansion is from said distal end towards said proximal end.
3. The device of claim 1 , wherein the tapered end of the balloon comprises said proximal end, such that the resistance to the controlled directional expansion increases from said proximal end to said distal end and said expansion is from said proximal end towards said distal end.
4. The device of claim 1 , wherein the balloon-expandable stent comprises a lesser amount of material at a section to be expanded first, wherein said lesser amount of material has fewer stent struts or has thinner stent struts.
5. The device of claim 4 , wherein said lesser amount of material is situated at the proximal end of the device and increases towards the distal end of the device, such that expansion of said stent occurs from said proximal end towards said distal end; or
wherein said lesser amount of material is situated at said distal end and increases towards said proximal end, such that expansion of said stent occurs from said distal end towards said proximal end.
6. The device of claim 1 , additionally comprising an externally placed expansion-preventing element slid thereon.
7. The device of claim 6 , wherein said externally placed expansion-preventing element comprises a removable, non-expandable sheath.
8. The device of claim 6 , wherein said externally placed expansion-preventing element is removed from the device placed therein by pulling from a distal end towards a proximal end of said balloon-expandable stent thereby enabling an expansion of the balloon-expandable stent from its distal end to its proximal end, or by pushing from said proximal end towards said distal end of said device, such that expansion occurs from said proximal end to said distal end.
9. The device of claim 6 , wherein said externally placed expansion-preventing element comprises one or more markers visible with one or more of ultrasound, X-ray, CT, and MRI imaging modalities.