Medical device and procedure method

Patent metadata

Field	Value
Publication number	US-11096705-B2
Application number	US-201916282436-A
Country	US
Kind code	B2
Filing date	Feb 22, 2019
Priority date	Aug 29, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A medical device to be inserted into a blood vessel for effectively removing an object flowing in a biological lumen while reducing the burden on the living body includes an elongated shaft portion, and an expansion portion which is an elastically deformable cylindrical body having a plurality of gaps and in which a proximal portion or a distal portion of the cylindrical body is interlocked with the shaft portion. The expansion portion has a ring-shaped or annular bent portion which protrudes toward a proximal side position radially outside the expansion portion in a bent state of being bent along an axial direction, and an axial length of a second portion from the bent portion to a proximal end of the expansion portion is shorter than an axial length of a first portion from the bent portion to the distal end of the expansion portion.

First claim

What is claimed is:

1. A medical device to be inserted into a biological lumen for collecting an object in the biological lumen, the medical device comprising:
an elongated shaft portion that includes a central axis extending along a length of the elongated shaft portion;
an expansion portion that includes an elastically deformable body, the elastically deformable body possessing a proximal portion and a distal portion, the elastically deformable body including a plurality of through gaps that pass through the elastically deformable body, the proximal portion of the elastically deformable body or the distal portion of the elastically deformable body being interlocked with the elongated shaft portion;
the expansion portion including a radially outwardly located annular-shaped bent portion which, in a bent state of the expansion portion, is bent toward a proximal side in an axial direction;
the expansion portion including a central axis that passes through the expansion portion from a proximal end portion of the expansion portion to a distal end portion of the expansion portion;
the central axis of the expansion portion being other than coaxial with the central axis of the elongated shaft portion; and
wherein the expansion portion in the bent state includes a first portion and a second portion, wherein the expansion portion is changeable from the bent state to an extended state, and wherein the second portion is moved to the proximal side with respect to the first portion and is pulled out from an inside of the first portion when the expansion portion changes from the bent state to the extended state.

2. The medical device according to claim 1 , wherein the first portion of the expansion portion extends from the bent portion of the expansion portion in the bent state to a distal end of the expansion portion, the second portion of the expansion portion extends from the bent portion of the expansion portion in the bent state to a proximal end of the expansion portion, and shapes of the first portion and the second portion are non-planar symmetric with respect to an axially orthogonal cross section.

3. The medical device according to claim 1 , wherein the expansion portion is in the bent state in a natural state when no force is applied to the expansion portion.

4. The medical device according to claim 1 , wherein the first portion of the expansion portion extends from the bent portion of the expansion portion in the bent state to a distal end of the expansion portion, the second portion of the expansion portion extends from the bent portion of the expansion portion in the bent state to a proximal end of the expansion portion, and the first portion and the second portion are separately located in spaced relation to one another without coming into contact with each other in the bent state of the expansion portion.

5. The medical device according to claim 1 , wherein the first portion of the expansion portion extends from the bent portion of the expansion portion in the bent state to a distal end of the expansion portion, the second portion of the expansion portion extends from the bent portion of the expansion portion in the bent state to a proximal end of the expansion portion, and the second portion is positioned at an inside of the first portion in the bent state of the expansion portion, the expansion portion being changeable from the bent state to a boundary state in which an entirety of the second portion is pulled out from the inside of the first portion and the second portion has an inflection point on a plane seen from the axial direction of the expansion portion.

6. The medical device according to claim 1 , wherein, in the bent state of the expansion portion, a relative axial position of the second portion is changeable with respect to the first portion.

7. The medical device according to claim 1 , wherein the expansion portion in the extended state includes a portion possessing a maximum outer diameter, in the extended state of the expansion portion, a length from the portion possessing the maximum outer diameter to the distal end portion of the expansion portion is longer than a length from the portion possessing the maximum outer diameter to the proximal end portion of the expansion portion.

8. The medical device according to claim 1 , wherein in the extended state of the expansion portion, a maximum inclination angle of the second portion with respect to the axial direction is larger than a maximum inclination angle of the first portion of the expansion portion with respect to the axial direction.

9. The medical device according to claim 1 , wherein, in the bent state of the expansion portion, a convex portion of the second portion is convex toward a distal side and a convex portion of the first portion is convex toward the distal side, a curvature radius of the convex portion of the first portion is larger than a curvature radius of the convex portion of the second portion.

10. The medical device according to claim 1 , wherein the expansion portion comprises an interlock portion that includes an inner tube and an outer tube, the inner tube being positioned inside the outer tube so that the outer tube surrounds the inner tube, a part of the elastically deformable body and a distal end portion of the elongated shaft portion being positioned and fixed between the inner tube and the outer tube so that movement of the elongated shaft portion results in movement of the inner tube and the outer tube of the interlock portion together with the part of the elastically deformable body.

11. The medical device according to claim 10 , wherein the proximal portion of the elastically deformable body is interlocked with the elongated shaft portion, the elongated shaft portion being interlocked with the elastically deformable body only at the proximal portion of the elastically deformable body, the part of the elastically deformable body that is positioned and fixed between the inner tube and the outer tube being the proximal portion of the elastically deformable body.

12. The medical device according to claim 11 , wherein the proximal end portion of the expansion portion is located proximal to the bent portion in the bent state.

Assignees

• Terumo Corp

Inventors

• Imai Masaomi
• CHIDA Takahiro
• MASUBUCHI Yuki
• Kitaoka Takashi
• Kanamoto Kazuaki

Classifications

• A61B17/320725

  with radially expandable cutting or abrading elements (A61B17/32075 takes precedence) · CPC title

• A61F2002/015

  Stop means therefor · CPC title

• A61F2/013

  Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting · CPC title

• A61B17/221 Primary

  Gripping devices in the form of loops or baskets {for gripping calculi or similar types of obstructions (surgical snare instruments A61B17/32056)} · CPC title

• A61F2/012

  Multiple filtering units · CPC title