US-20260124432-A1 - DISTAL STABILIZER

Abstract

This distal stabilizer used for catheter delivery in a biological lumen comprises a linear delivery member and a cylindrical part that extends from the distal end of the linear delivery member and that latches to the inner wall of the biological lumen. The cylindrical part has a structure in which cells 20 of a form surrounded by wire-shaped members are lined up along the long axis direction. At least one of the cells is an open cell having at least one free convex end 23 . In the open cell, the wire-shaped member 22 a that, from among the wire-shaped members forming the free convex end 23 , extends in the direction in which the cells are lined up is disposed so as to be substantially parallel to the wire-shaped member 22 c of another cell adjacent in the lateral direction with respect to the direction in which the cells are lined up.

Inventors

• Naoki INUZUKA

Assignees

• Bolt Medical Inc.

Dates

Publication Date

20260507

Application Date

20231013

Priority Date

20221014

Claims (5)

1. 1 .- 4 . (canceled)
2. 5 . A method comprising delivering to a target position on a distal side in a biological lumen a treatment catheter or a treatment device via the treatment catheter disposed at the target position, wherein the method employs a distal stabilizer as an anchoring device when delivering the treatment catheter to the target position, and the distal stabilizer includes a linear delivery member; and a cylindrical part extending from a distal end of the linear delivery member and lockable to an inner wall of the biological lumen, wherein the cylindrical part has a structure in which cells each having a shape surrounded by wire-shaped members are arranged along a longitudinal direction, at least one of the cells is an open cell having at least one protruding free end, and a wire-shaped member, which extends in an arrangement direction of the cells and is one of wire-shaped members that form the at least one protruding free end, is disposed substantially parallel to one of wire-shaped members, which extends in the arrangement direction of the cells, forming another cell that is adjacent side by side to the open cell with respect to the arrangement direction when the wire-shaped member is in a natural state.
3. 6 . The method according to claim 5 , wherein the wire-shaped member forming the protruding free end of the cell and extending in the arrangement direction, when the wire-shaped member is in a natural state, intersects at an angle of 0° to 15° with the one of the wire-shaped members forming the other cell that is adjacent side by side to the open cell with respect to the arrangement direction.
4. 7 . The method according to claim 5 , wherein the cylindrical part has a structure in which cells each having a shape surrounded by wire-shaped members are arranged helically with respect to the longitudinal direction.
5. 8 . The method according to claim 5 , wherein the cylindrical part is used by being inserted into a catheter having an inner diameter of 0.017 inches or less.

Description

TECHNICAL FIELD The present invention relates to a distal stabilizer that is locked in a biological lumen as an anchoring device. BACKGROUND ART Certain treatments are administered by means of a catheter guided into a biological lumen, such as a patient's artery, so that a distal end of the catheter is placed in a vicinity of a target position. In this connection, the inner path of the catheter is used to deliver a treatment device to the target position, or the catheter itself is used as a treatment device. For example, Patent Document 1 discloses a distal stabilizer (anchoring device) including a delivery wire and a locking stent for anchoring that is joined to the distal end of the delivery wire. Upon being released from a microcatheter, the locking stent expands to be anchored to the inner wall of a biological lumen, so that a treatment catheter externally fitted over the microcatheter can be delivered to the vicinity of a target position. CITATION LIST Patent Document Patent Document 1: US Patent No. 968221 DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Intracranial blood vessels such as an anterior cerebral artery (ACA), an anterior communicating artery (Acom), a middle cerebral artery (MCA), etc. are known as parts where an aneurysm is likely to form. Since these blood vessels have a small diameter and bent shape, it is difficult to deliver a large-diameter catheter therein, and only a small-diameter catheter having a small inner diameter of about 0.0165 inches (about 0.42 mm) can be usually delivered to the vicinity of an aneurysm forming in such a blood vessel. On the other hand, an aneurysm stent and a flow diverter are used as aneurysm treatment devices. In order to deliver these treatment devices to the vicinity of a target position, it is necessary to use a large-diameter catheter having an inner diameter of about 0.021 inches (about 0.53 mm) to about 0.027 inches (about 0.69 mm). In a case where the above treatment devices are to be delivered to an aneurysm in a narrow blood vessel, use of a locking stent (distal stabilizer) as an anchoring device is necessitated because it is difficult or impossible to deliver a large-diameter catheter by means of a guidewire, which is a common approach. To this end, a small-diameter catheter is initially delivered to on a distal side of the aneurysm, and then, the locking stent is anchored to on the distal side of the aneurysm. This procedure requires insertion of the locking stent (distal stabilizer) into the small-diameter catheter. On the other hand, in a case of increasing the expansion force of the locking stent in order for the locking stent to have a frictional force with a blood vessel wall that is necessary for delivery of a large-diameter catheter, there is concern that the blood vessel wall may be damaged and the slidability of the locking stent with respect to the inner wall of the catheter tends to deteriorate. An increase in the frictional force with the blood vessel wall requires an increase in the mesh density of the locking stent. However, when a locking stent having a high mesh density is inserted into a small-diameter catheter, the wires (struts) forming the locking stent overlap with each other, resulting in an increase in the diameter of the locking stent, whereby the slidability with respect to the inner wall of the catheter tends to deteriorate. These phenomena are particularly significant, for example, for a locking stent having an open cell structure that is highly protective of the blood vessel wall. An object of the present invention is to provide a distal stabilizer with an open cell structure, which has a frictional force with a blood vessel wall necessary for the distal stabilizer as an anchoring device for delivering a large-diameter catheter, and exhibits an excellent slidability when reduced in diameter and inserted into a small-diameter catheter. Means for Solving the Problems The present invention relates to a distal stabilizer for use for catheter delivery in a biological lumen, the distal stabilizer including: a linear delivery member; and a cylindrical part extending from a distal end of the linear delivery member and lockable to an inner wall of the biological lumen. The cylindrical part has a structure in which cells each having a shape surrounded by wire-shaped members are arranged along a longitudinal direction, and at least one of the cells is an open cell having at least one protruding free end. A wire-shaped member, which extends in an arrangement direction of the cells and is one of wire-shaped members that form the at least one protruding free end, is disposed substantially parallel to one of wire-shaped members forming another cell that is adjacent side by side to the open cell with respect to the arrangement direction. In the distal stabilizer, the wire-shaped member forming the protruding free end of the cell and extending in the arrangement direction, when the wire-shaped member is in a n