Stent delivery method

Patent metadata

Field	Value
Publication number	US-10888691-B2
Application number	US-201815960673-A
Country	US
Kind code	B2
Filing date	Apr 24, 2018
Priority date	Apr 24, 2018
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A stent delivery method includes: forming through-holes in an alimentary canal wall and a cyst wall so as to communicate with each other; passing a stent through the through-holes and placing a first expandable part in the alimentary canal and a second expandable part in the cyst; allowing the first expandable part to expand to an expanded state in the alimentary canal; and, after the expansion of the first expandable part, allowing the second expandable part to expand in the cyst while the alimentary canal wall is pressed by the first expandable part in the expanded state.

First claim

The invention claimed is:

1. A stent delivery method using a tubular stent having a first expandable part and a second expandable part, the first and second expandable parts being provided at positions away from each other in a direction parallel to a central axis of the stent, the first and second expandable parts being expandable from a non-expanded state to an expanded state, in which the outside diameters of the first and second expandable parts are larger than those in the non-expanded state, the method comprising:
inserting an endoscope into an alimentary canal;
forming a first though-hole in a wall of the alimentary canal and forming a second through-hole in a wall of a cyst such that the alimentary canal and the cyst communicate with each other through the first and second through-holes, the cyst being formed outside the alimentary canal, and the wall of the cyst adjoining the wall of the alimentary canal;
inserting the stent through the first and second through-holes such that the first expandable part is placed in the alimentary canal and the second expandable part is placed in the cyst;
allowing the first expandable part to expand to the expanded state in the alimentary canal; and
while observing, by the endoscope, the first expandable part in the expanded state, allowing the second expandable part to expand in the cyst while moving the first expandable part distally to press the wall of the alimentary canal with the first expandable part in the expanded state.

2. The stent delivery method according to claim 1 , wherein the alimentary canal is the stomach, and the cyst is the pancreatic cyst.

3. The stent delivery method according to claim 1 , further comprising, before forming the first and second through-holes, inserting the stent into the alimentary canal with the first and second expandable parts being in the non-expanded state.

4. The stent delivery method according to claim 1 , wherein
the stent is attached to the outer circumference of a distal end portion of an inner tube,
in a state in which the stent is attached to the outer circumference of the distal end portion of the inner tube, the second expandable part is located further distally than the first expandable part,
an outer sheath and a cover respectively cover the outer circumference of the first expandable part and the outer circumference of the second expandable part in the non-expanded state, the outer sheath and the cover being movable in a direction parallel to the central axis of the stent, relative to the stent,
the allowing of the first expandable part to expand comprises moving the outer sheath proximally, relative to the stent, to remove a radially inward compression of the first expandable part by the outer sheath, and
the allowing of the second expandable part to expand comprises moving the cover distally, relative to the stent, to remove a radially inward compression of the second expandable part by the cover.

5. The stent delivery method according to claim 4 , wherein
the cover is formed of a thread wound around the circumference of the second expandable part of the stent, a portion of the thread being joined to the inner tube, and
the allowing of the second expandable part to expand comprises moving the inner tube distally, relative to the stent, to unwind the thread from around the circumference of the second expandable part.

6. The stent delivery method according to claim 4 , further comprising, after the expansion of the second expandable part, allowing the inside diameter of the stent to increase to a diameter larger than the outside diameter of the cover.

7. The stent delivery method according to claim 1 , wherein
the stent is attached to the outer circumference of a distal end portion of an inner tube,
in a state in which the stent is attached to the outer circumference of the distal end portion of the inner tube, the second expandable part is located further distally than the first expandable part,
a thread is wound around the outer circumferences of the first and second expandable parts in the non-expanded state, a first end of the thread being located at the distal-end side of the stent, a second end of the thread being located at the base-end side of the inner tube,
the allowing of the first expandable part to expand comprises pulling the second end of the thread to remove a radially inward compression of the first expandable part by the thread, and
the allowing of the second expandable part to expand comprises, after the expansion of the first expandable part, additionally pulling the second end of the thread to remove the radially inward compression of the second expandable part by the thread.

8. The stent delivery method according to claim 1 , wherein the stent is provided in a stent delivery device inserted into a treatment tool channel in the endoscope,
the first expandable part is provided further proximally to a base end of the stent delivery device than the second expandable part, and
the wall of the alimentary canal is pressed with the first expandable part in the expanded state by pushing the stent delivery device in a direction so as to project from the treatment tool channel.

9. A stent delivery method using a tubular stent having a first expandable part and a second expandable part, the first and second expandable parts being provided at positions away from each other in a direction parallel to a central axis of the stent, the first and second expandable parts being expandable from a non-expanded state to an expanded state, in which the outside diameters of the first and second expandable parts are larger than those in the non-expanded state, the method comprising:
forming through-holes in an alimentary canal wall and a cyst wall so as to communicate with each other, the cyst being formed outside the alimentary canal, and the cyst wall adjoining the alimentary canal wall;
inserting the stent through the through-holes and placing the first expandable part in the alimentary canal and the second expandable part in the cyst;
allowing the first expandable part to expand to the expanded state in the alimentary canal; and
after the expansion of the first expandable part, allowing the second expandable part to expand in the cyst while pressing the wall of the alimentary canal with the first expandable part in the expanded state;
wherein
the stent is attached to the outer circumference of a distal end portion of an inner tube,
in a state in which the stent is attached to the outer circumference of the distal end portion of the inner tube, the second expandable part is located closer to the distal-end side than the first expandable part is,
an outer sheath and a cover respectively cover the outer circumference of the first expandable part and the outer circumference of the second expandable part in the non-expanded state, the outer sheath and the cover being movable in a direction parallel to the central axis of the stent, relative to the stent,
the allowing the first expandable part to expand includes moving the outer sheath toward the base-end side, relative to the stent, to remove radially inward compression of the first expandable part by the outer sheath, and
the allowing the second expandable part to expand includes moving the cover toward the distal-end side, relative to the stent, to remove radially inward compression of the second expandable part by the cover.

10. The stent delivery method according to claim 9 , wherein
the cover is formed of a thread wound around the circumference of the second expandable part of the stent, a portion of the thread being joined to the inner tube, and
the allowing the second expandable part to expand includes moving the inner tube toward the

Assignees

• Olympus Corp

Inventors

• Katayama Tomofumi
• Matsunaga Rei
• Mamiya Tomohiko

Classifications

• A61F2/9661 Primary

  the proximal portion of the stent or stent-graft is released first · CPC title

• A61M27/002 Primary

  Implant devices for drainage of body fluids from one part of the body to another (intraocular A61F9/00781; middle ear A61F11/202) · CPC title

• A61M2210/1053

  Stomach · CPC title

• A61F2002/041

  Bile ducts · CPC title

• A61F2250/0039

  differing in diameter · CPC title