Intracranial Stent and Method of Use

• US 20080243229A1
• Filed: 01/29/2008
• Published: 10/02/2008
• Est. Priority Date: 09/18/1996
• Status: Active Grant

• Current Assignee: Micro Therapeutics, Inc. (Medtronic Plc)
• Original Assignee: Micro Therapeutics, Inc. (Medtronic Plc)
• Inventors: Wallace, George, Lenker, Jay, Berryman, Thomas J.
• Granted Patent: US 7,901,445 B2
• Time in Patent Office: Days
• US Class Current: 623/1.15
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/12118 for positioning in conjunction with a stent
• CPC Class Codes: A61B 17/1214 Coils or wires
• CPC Class Codes: A61B 17/122 Clamps or clips , e.g. for the umbilical cord for the vas deferens A61F6/206
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2230/0095 Saddle-shaped
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

A stent and stent catheter for intra-cranial use.

Claims

1. A stent comprising a generally tubular walled structure having a substantial un-occluded opening in the wall of the stent, where said opening spans a substantial arcuate segment of the stent.

2. The stent of claim 1, said stent further comprising a sheet of resilient material having a shape corresponding to a capital letter “

H”

, wherein the wrap length of the stent corresponds to the circumference of the vessel.

3. The stent of claim 1, said stent further comprising:

a sheet of resilient material having a first edge, a second edge, a third edge, a fourth edge and a spine extending from the third edge to the fourth edge, said spine being generally parallel to the first and second edges;

wherein the first edge has a first rectangular-shaped open section disposed within the first edge, said first rectangular-shaped open section sized and dimensioned to extend from the spine to the first edge, and to a first distance from the third edge and a second distance from the fourth edge;

wherein the second edge has a second rectangular-shaped open section disposed within the second edge, said second rectangular-shaped open section sized and dimensioned to extend from the spine to the second edge, and to the first distance from the third edge and the second distance from the fourth edge;

wherein the sheet of resilient material is tightly rolled about an axis parallel to the first and second edges to form a tightly rolled stent, said tightly rolled stent having a diameter less than 1 mm and expandable to a diameter of approximately 1 mm;

wherein the tightly rolled stent is expandable to a diameter of approximately 1 mm to provide slight compliance mismatch with an intra-cranial blood vessel having an internal diameter of approximately 1 mm; and

when expanded the stent comprises two rolls with a plurality of layers, said rolls connected by the spine.

4. The stent of claim 1, said stent further comprising a sheet of resilient material having a wrap length corresponding to the circumference of the vessel and a bridge length corresponding to the long axis of the vessel, wherein the wrap length of the sheet is less than the circumference of the vessel, and the bridge length is sufficient to extend longitudinally in the vessel to isolate a diseased portion of the vessel, said sheet being capable of taking on a curvature conforming to the curvature of the vessel.

5. The stent of claim 4 further comprising at least one circumferentially extending tab which takes on the curvature of the vessel.

6. The stent of claim 4 further comprising a first tab extending circumferentially from a first end of the stent and second tab extending circumferentially from the first end of the stent in a direction opposite the first tab, said first and second tabs and stent having a combined wrap length exceeding the circumference of the vessel.

7. The stent of claim 6 further comprising a third tab extending circumferentially from a second end of the stent and fourth tab extending circumferentially from the second end of the stent in a direction opposite the third tab, said third and fourth tabs and stent having a combined wrap length exceeding the circumference of the vessel.

8. The stent of claim 1 wherein the sheet of resilient material is characterized by a first transverse edge connected to a first longitudinal edge connected to a second transverse edge connected to a second longitudinal connected to the first transverse edge and wherein the first transverse edge has a length less than an inner circumference of the vessel.

9. The stent of claim 1 wherein the sheet of resilient material is characterized by a first transverse edge connected to a first longitudinal edge connected to a second transverse edge connected to a second longitudinal connected to the first transverse edge and wherein the first transverse edge has a length greater than an inner circumference of the vessel.

10. The stent of claim 1 wherein the sheet of resilient material is characterized by a first transverse edge connected to a first longitudinal edge connected to a second transverse edge connected to a second longitudinal connected to the first transverse edge and wherein the first transverse edge has a length equal to an inner circumference of the vessel.

11. The stent of claim 1 wherein the sheet is characterized by a tapered thickness.

12. A method for treating a diseased blood vessel having a diseased portion, said method comprising:

providing a stent comprising a self expanding rolled sheet of resilient material having an open frame with a plurality of frame members and an opening between the frame members sized and dimensioned to overlie a branch of vessels when the stent is placed within the vessel, wherein at least one frame member is sized and dimensioned to occlude the diseased portion of the vessel and isolate the diseased portion from blood pressure within the vessel; and

deploying the stent in the diseased blood vessel,

isolating the diseased portion of the vessel with one or more frame members whereby exposure of the diseased potion of the vessel to blood pressure within the vessel is reduced.

13. A method for treating a intracranial blood vessel having a diseased portion, said method comprising:

providing a stent comprising a self expanding rolled sheet of resilient material having an open frame with a plurality of frame members and an opening between the frame members sized and dimensioned to overlie a branch of vessels when the stent is placed within the vessel, wherein at least one frame member is sized and dimensioned to occlude the diseased portion of the vessel and isolate the diseased portion from blood pressure within the vessel; and

deploying the stent in the intracranial blood vessel,

isolating the diseased potion of the vessel with one or more frame members whereby exposure of the diseased potion of the vessel to blood pressure within the vessel is reduced.