US-12622704-B2 - Medical device with tube and basket

US12622704B2US 12622704 B2US12622704 B2US 12622704B2US-12622704-B2

Abstract

A medical device comprising: an outer tube, a basket, and a basket pusher, wherein the basket includes a first bundling portion at which the plurality of wires are fixed at a distal portion of the basket, and a second bundling portion at which the plurality of wires are fixed at a proximal portion of the basket, in a state where the basket is accommodated in the outer tube, the first bundling portion has a first end being an end portion on a far side with respect to the second bundling portion and a second end being an end portion on a near side with respect to the second bundling portion, and as the basket comes out of the outer tube, an angle on the proximal side between an extending direction of the outer tube and a straight line passing through the first end and the second end becomes smaller.

Inventors

Atsushi Ogawa
Masayuki Takatera

Assignees

KANEKA CORPORATION

Dates

Publication Date: 20260512
Application Date: 20240906
Priority Date: 20220308

Claims (13)

1 . A medical device comprising: an outer tube having a distal end and a proximal end; a basket disposed in an inner cavity of the outer tube and having a plurality of wires, the basket being expandable when having come out of the outer tube; and a basket pusher disposed on a proximal side with respect to the basket, wherein the basket includes a first bundling portion at which the plurality of wires are bundled and fixed at a distal portion of the basket, and a second bundling portion at which the plurality of wires are bundled and fixed at a proximal portion of the basket, in a state where the basket is accommodated in the outer tube, the first bundling portion has a first end being an end portion on a far side with respect to the second bundling portion and a second end being an end portion on a near side with respect to the second bundling portion, and the outer tube and the basket are configured so that in at least a partial section of the basket, as the basket comes out of the outer tube, an angle on the proximal side between an extending direction of a leading end portion of the outer tube and a straight line passing through the first end and the second end of the first bundling portion becomes smaller.
2 . The medical device according to claim 1 , wherein the basket is configured so that in a state where a predetermined length of the basket has come out of the outer tube, the second end is positioned on a distal side with respect to the first end.
3 . The medical device according to claim 1 , wherein the outer tube and the basket are configured so that when a predetermined length of the basket has come out of the outer tube, the angle on the proximal side between the extending direction of the leading end portion of the outer tube and the straight line passing through the first end and the second end of the first bundling portion becomes 0 degrees or more and 90 degrees or less (including 0 degrees), and the predetermined length is a length of 1/10 or more and ¾ or less of a length from a proximal end of the basket to a distal end of the basket.
4 . The medical device according to claim 1 , wherein the outer tube and the basket are configured so that in a state where an entirety of the basket has come out of the outer tube and no external force is applied to the basket, the angle on the proximal side between the extending direction of the outer tube and the straight line passing through the first end and the second end of the first bundling portion is more than 90 degrees and 180 degrees or less (including 180 degrees).
5 . The medical device according to claim 1 , wherein in a state where an entirety of the basket has come out of the outer tube and no external force is applied to the basket, the second end is positioned on a distal side with respect to the first end.
6 . The medical device according to claim 1 , wherein the basket is configured so that in a state where a predetermined length of the basket has come out of the outer tube, the first bundling portion is positioned outside the basket, and in a state where an entirety of the basket has come out of the outer tube and no external force is applied to the basket, the first bundling portion is positioned inside the basket.
7 . The medical device according to claim 1 , wherein the plurality of wires of the basket include a first wire group and a second wire group, and a length of the wire of the first wire group is shorter than a length of the wire of the second wire group.
8 . The medical device according to claim 7 , wherein the plurality of wires of the basket further include a third wire group, a length of the wire of the third wire group is longer than the length of the wire of the first wire group and shorter than the length of the wire of the second wire group, and in a cross-section perpendicular to an extending direction of the basket pusher, a distance between the first wire group and the second wire group is longer than a distance between the first wire group and the third wire group.
9 . The medical device according to claim 1 , wherein the basket is configured so that in the state where the basket is accommodated in the outer tube, the second bundling portion has one end being an end portion on a near side with respect to the first bundling portion and another end being an end portion on a far side with respect to the first bundling portion, and in a state where an entirety of the basket has come out of the outer tube and no external force is applied to the basket, the one end is positioned on a distal side with respect to the another end.
10 . The medical device according to claim 1 , comprising a connection member on the proximal side with respect to the basket and on a distal side with respect to the basket pusher.
11 . The medical device according to claim 1 , wherein the first bundling portion and the second bundling portion include a radiopaque material.
12 . The medical device according to claim 1 , wherein each wire of the basket includes a superelastic alloy.
13 . The medical device according to claim 1 , wherein each wire of the basket includes a radiopaque material.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a Continuation of PCT International Application No. PCT/JP2023/006366, filed on Feb. 22, 2023, which claims priority under 35 U.S.C. 119 (a) to Patent Application No. 2022-034902, filed in Japan on Mar. 8, 2022, all of which are hereby expressly incorporated by reference into the present application. TECHNICAL FIELD The present invention relates to a medical device that is used for a blood vessel or an in-vivo lumen of a digestive organ or the like. BACKGROUND ART In treatment of an in-vivo lumen, a device having a basket is used in some cases. Specific examples include: a treatment in which an abnormal object such as a thrombus generated in a blood vessel or a calculus generated in a digestive organ tract such as a bile duct is trapped inside a basket and removed; and embolization in which a basket is indwelled in a vascular lesion portion such as an aneurysm to alter the blood flow to prevent rupture of the bulge. Further, embolization in which a basket is disposed in a bulge and a coil is packed in this basket to fill the bulge, thereby preventing rupture of the bulge, is also known. For example, Patent Literature 1 describes an embolic protection device for use in a lumen. The embolic protection device includes: a core wire; and a cannula attached to the core wire and extending in the proximal direction about the core wire. The cannula forms a basket portion including a plurality of struts and a filter portion. The filter portion has a plurality of openings formed in the cannula. The basket portion is movable between an expanded state and a collapsed state. Patent Literature 2 describes a catheter device that has: a catheter to be inserted into a lumen of a human body; a branch portion connected to a base end portion of the catheter and provided with an insertion hole for allowing passage therethrough of a guide wire to be used when the catheter is inserted into a lumen of the human body; and a liquid introducing means that introduces a liquid such as a drug solution into the catheter through a tube connected to the branch portion. At the leading end of the catheter, an embolus trapping means for trapping an embolus in a lumen of the human body is disposed. The embolus trapping means is formed by a net member that opens and closes in a parachute shape with the interval between both ends thereof being reduced or increased. Patent Literature 3 describes a device that includes a self-expandable-type resilient permeable shell. The self-expandable-type resilient permeable shell includes a plurality of elongated resilient filaments with a woven structure fixed to each other at proximal ends and distal ends of the filaments. Further, the self-expandable-type resilient permeable shell has: a radially constrained elongated state configured for delivery within a microcatheter, with the thin woven filaments extending longitudinally from the proximal end to the distal end radially adjacent to each other along the lengths of the filaments; and an expanded relaxed state with a globular longitudinally shortened configuration relative to the radially constrained state, with the woven filaments forming the self-expandable-type resilient permeable shell in a smooth path radially expanded from the longitudinal axis between the proximal end and the distal end including a plurality of openings in the shell formed between the woven filaments. The largest of the openings is configured to allow blood flow through the openings at a velocity below a thrombotic threshold velocity. Patent Literature 4 describes an embolus trapping device that includes: a long shaft member whose leading end side is sent into a lumen; a leading end guide portion that is flexible and disposed at the leading end of the shaft member; and an embolus trapping filter having a filter portion provided on the base end side of the leading end guide portion and composed of a mesh formed by wires having elasticity or shape memory properties, the filter portion having a basket shape that contracts in a catheter for device transport and expands when released from the catheter into a lumen, and a bundling portion at which the wires forming the filter portion are bundled at each of the leading end side and the base end side. The embolus trapping device is disposed such that the opening of the filter portion is oriented toward the leading end side of the shaft member and opposed to the blood flow, thereby trapping an embolus released in the lumen. Patent Literature 5 describes an occlusion device including: a substantially tubular structure that has a proximal end region and a distal end region, that has a first expanded state and a second collapsed state, that has, in the second collapsed state, dimensions suitable for insertion through the vascular system of a patient into the neck of an aneurysm, that has an outer surface capable of coming into contact with the aneurysm in the expanded state, and that fu