KR20200024431A - Wire type thrombectomy apparatus - Google Patents

Abstract

A wire-type thrombus removal apparatus according to the present invention comprises: an inner wire extending longitudinally from a wire tip; a push wire sliding along a longitudinal direction by being coaxially coupled to the outer peripheral surface of the inner wire; and an expanding member in which helical members wound spirally along the longitudinal direction from one side of the push wire to the bottom of the wire tip are continuously arranged along the circumference of the inner wire diameter, and helical members are helically expanded or contracted according to the relative movement of the push wire relative to the inner wire. The present invention can more easily remove thrombus due to structural features of a helical expansion member.

Description

Wire-Type Thrombus Removal Device {WIRE TYPE THROMBECTOMY APPARATUS}

The present invention relates to a wire-type blood clot removal device, and more particularly, to a wire-type blood clot removal device for removing a blood clot by inserting a conventional blood clot removal device in a region difficult to access.

Thrombobectomy is a treatment method for removing blood clots that block blood vessels. The thrombectomy is mainly performed by inserting a blood clot removal device into a blood vessel to remove blood clots formed on the inner wall of the blood vessel.

The thrombus removal device can be classified into stent type and aspiration type according to the shape and mechanism. Both of them commonly have a microtubular catheter near the occluded blood vessel and pass through the occluded area. By using an extension member or a suction type catheter provided at a target position, a method of scraping or sucking a blood clot is used.

However, in the conventional blood clot removal device, a tubular catheter is inserted, so that the stent or suction clot removal device has to move, so that the catheter has a smaller diameter than the distal blood vessel or the stent or aspiration clot removal device. Blood vessels and the anatomical structure of the above apparatus is difficult to use in the treatment of thrombus removal.

Korea Patent Registration No. 10-1729398 Korean Patent Publication No. 10-2017-0107482

One aspect of the present invention provides a wire-type thrombus removal device for easily removing blood clots formed on the inner wall of blood vessels with a simple operation by easily accessing a vascular structure that is difficult for a conventional catheter-type thrombus removal device.

The technical problem of the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Wire-type thrombus removal device according to an embodiment of the present invention, the wire tip, the inner wire extending in the longitudinal direction from the wire tip, is coaxially coupled to the outer peripheral surface of the inner wire to slide along the longitudinal direction of the inner wire A push wire and a helical member spirally wound along the length direction from one side of the push wire to a lower end of the wire tip, wherein the helical member is disposed continuously around the diameter of the inner wire, the inner wire And an expansion member in which the helical member helically expands or contracts in response to the relative movement of the push wire relative to the push wire.

The push wire may be a first moving direction which is a moving direction approaching the wire tip along the longitudinal direction of the inner wire by an external force in the longitudinal direction applied to the inner wire, or a second moving direction which is spaced apart from the wire tip. Relative sliding with respect to the inner wire along the direction of movement can be.

The helical member is, when the push wire is slid in the first moving direction as the inner wire is pulled backward by the external force in the longitudinal direction, the center portion is curved in the radial direction by the contracting force applied to both ends, The expansion member may be spaced apart from a neighboring helical member when the helical member is wound in a spiral shape, and may have diagonal gaps at regular intervals along a diameter circumferential direction of the inner wire.

As the helical member is pushed forward by an external force in a direction opposite to the direction in which the inner wire is pulled, when the push wire is slid in the second movement direction, the center portion is moved in the radial direction by the expansion force applied to both ends. When the helical member is spirally wound, the expansion member is contracted, and the curved center portion is in close contact with the inner wire to fill the diagonal gap created by the expansion of the helical member. have.

The helical member may have a rectangular shape having a predetermined area and may be continuously disposed along the diameter of the inner wire at intervals longer than the width of the rectangular shape so as not to overlap with the neighboring helical member upon contraction.

The helical member may have a rectangular shape having a predetermined area and may be continuously disposed along the diameter of the inner wire at intervals shorter than the width of the rectangular shape so that the neighboring helical member and the predetermined area overlap with each other when contracted.

The helical member is formed of an elastic material, and the push wire is slid in the first moving direction by an external force applied to the push wire or the inner wire, and when the external force is removed, the helical member is restrained by the restoring force of the helical member. It may be slid in the second moving direction.

The stopper may further include a stopper formed on an outer circumferential surface of the inner wire such that the push wire slides only a predetermined movement distance in the first movement direction.

The helical member has a torsion portion formed at a central portion thereof, and when the push wire is slid in the first movement direction, the central portion is expanded in the radial direction by a contraction force applied to both ends, and the expansion member is wound in a spiral shape. When each of the helical members in which the torsion part is formed is expanded, a vortex-shaped gap may be formed at regular intervals along a diameter circumferential direction of the inner wire to be spaced apart from a neighboring helical member.

The expansion member may be provided in plurality, and one of the expansion members may be disposed along a length direction of the inner wire through a neighboring expansion member and a connection member formed between the wire tip and the push wire.

According to one aspect of the present invention, the inner wire of the wire-type thrombus removal device has a small diameter to easily access blood vessels that are difficult to access the conventional thrombus removal device, the structural features of the helical expansion member This makes it easier to remove the thrombus.

1 is a perspective view showing an expanded state of the wire-type thrombus removing apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view illustrating a contraction of the wire-type blood clot removing device of FIG. 1.
3 and 4 are views illustrating a specific operation of the wire-type blood clot removing device of FIG.
5 and 6 are views showing a specific process of the blood clot removal using the wire-type blood clot removal device of FIG.
7 is a perspective view showing a wire-type thrombus removing apparatus according to another embodiment of the present invention.
8 is a perspective view showing a wire-type thrombus removing apparatus according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 is a perspective view showing a wire-type blood clot removal device according to an embodiment of the present invention. 1 is a perspective view showing an expanded state of the wire-type thrombus removing apparatus 1 according to an embodiment of the present invention, Figure 2 is a wire-type thrombus removing apparatus 1 according to an embodiment of the present invention contracted Figure is a perspective view shown.

The wire-type thrombus removing apparatus 1 according to an embodiment of the present invention is a medical tool used in a thrombectomy for removing a blood clot inserted through a blood vessel structure to occlude a blood vessel, and in particular, a conventional blood clot removing apparatus is accessible. It is a device for smooth blood circulation by scraping a blood clot inserted into a blood vessel which was difficult.

Specifically, the wire-type thrombus removing apparatus 1 according to an embodiment of the present invention may include a wire tip 110, an inner wire 100, a push wire 200, and an expansion member 300.

The inner wire 100 is a thin wire-like member with flexibility. Due to this feature, when the inner wire 100 is inserted into the blood vessel, the inner wire 100 may be bent according to the blood vessel structure and move to a specific position in the blood vessel, and the blood vessel of the micro vessel or a complicated structure, which is difficult to access by a conventional tubular catheter, may be Easy access

The wire tip 110 extends in the distal portion of the inner wire 100 and may be provided in a conical shape that can easily pass through the blood vessel occluded by the thrombus. The diameter of the wire tip 110 may be formed to be larger than the diameter of the inner wire 100 and smaller than or equal to the diameter of the push wire 200 to be described later. That is, the wire-type thrombus removing apparatus 1 according to the embodiment of the present invention minimizes the diameter of the wire tip 110 and easily accesses the inside of the blood vessel having a relatively small diameter, while the inner wire 100 to be described later. The expansion member 300 formed on the outer circumferential surface can be prevented from being in unnecessary contact with the inner wall of the blood vessel.

Push wire 200 is a tubular member with flexibility. The push wire 200 has a through hole formed in a length direction, and may be coaxially coupled to the inner wire 100 through the formed through hole. That is, the diameter of the push wire 200 may be provided to be larger than the diameter of the inner wire (100).

The length of the push wire 200 is provided to be shorter than the length of the inner wire 100, accordingly, the push wire 200 can slide along the length direction of the inner wire 100.

The expansion member 300 is a member formed along the longitudinal direction of the inner wire 100 from one side of the push wire 200 to the wire tip 110. The expansion member 300 is composed of a plurality of helical members 310 that are folded or unfolded in accordance with the sliding of the push wire 200.

The helical member 310 is a metal member wound spirally along the length direction of the inner wire 100 from one side of the push wire 200 to the wire tip 110.

The plurality of helical members 310 may be continuously disposed at predetermined intervals along the circumference of the inner wire 100 (for example, clockwise or counterclockwise). At this time, each helical member 310 is provided in a rectangular shape having the same area, the arrangement interval of the helical member 310 overlaps a predetermined area with the helical member 310 adjacent to any one helical member 310 Preferably, it may be less than the width of the helical member 310. Alternatively, the arrangement interval of each helical member 310 may not overlap with the neighboring helical member 310 when the expansion member 300 contracts, so that the interval of the inner wire 100 may be increased at intervals longer than the width of the helical member 310. It may be arranged continuously along the diameter circumference.

Each helical member 310 may be bent in the radial direction or unfolded in the longitudinal direction of the inner wire 100 according to the relative movement of the push wire 200 relative to the inner wire 100. The expansion member 300 composed of 310 may be expanded or contracted as a whole. In this regard, it will be described with reference to FIGS. 3 and 4 together.

3 and 4 are side views of the wire-type thrombus removing apparatus 1 shown in FIG.

As described above, the expansion or contraction of the expansion member 300 is determined by the sliding of the push wire 200, specifically, when an external force in the longitudinal direction is applied to the inner wire 100, according to the direction of the applied external force As the push wire 200 moves forward or backward along the longitudinal direction of the inner wire 100, the expansion member 300 may expand or contract.

3 is a view illustrating a form in which the expansion member 300 is contracted, and the plurality of helical members 310 constituting the expansion member 300 may maintain an unfolded state along the circumference of the diameter of the inner wire 100. . Specifically, any one helical member 310 may be continuously disposed along the circumference of the diameter of the inner wire 100 in a state where a predetermined area overlaps with the neighboring helical member 310.

In addition, as described above, since each helical member 310 is spirally wound along the longitudinal direction of the inner wire 100, a plurality of helical members 310 may be folded when the expansion member 300 contracts. It can maintain a shape similar to the shape. Accordingly, diagonal grooves may be formed on the surface of the expansion member 300 at regular intervals.

In this state, when the inner wire 100 is pulled backward or the push wire 200 is pushed in the direction of the wire tip 110 as shown in FIG. 4, the push wire 200 is moved with respect to the inner wire 100. Relative movement toward the direction in which the wire tip 110 is formed.

Hereinafter, for convenience of description, an external force is applied to the inner wire 100 or the push wire 200, so that the movement direction in which the push wire 200 approaches the wire tip 110 from its original position is directed to the first movement direction. In addition, an external force is applied to the inner wire 100 or the push wire 200 to define the moving direction in which the push wire 200 is spaced apart from the original position with the wire tip 110 as the second moving direction. .

That is, as shown in FIG. 4, when the push wire 200 slides along the first direction from the initial position shown in FIG. 3, the helical member 310 constituting the expansion member 300 has a contracting force. Will be added.

In this case, since both ends of the helical member 310 are fixed to the push wire 200 and the wire tip 110, when the contracting force is applied to the helical member 310, both ends of the helical member 310 approach each other, and the center of the helical member 310 approaches each other. Can rise in the radial direction of the wire.

As the center of each helical member 310 rises, the expansion member 300 may expand in the form of an elliptic sphere (rugby ball) in which the center is convex while the diameters of both ends thereof are fixed.

On the other hand, as the center of the helical member 310 is bent and raised by the contracting force, any one of the helical member 310 and the center of the neighboring helical member 310 may be spaced apart. Therefore, when the contracting force is applied to each of the helical members 310 spirally wound, the expansion member 300 may have a diagonal gap D formed at regular intervals along the circumferential direction of the diameter of the inner wire 100. Can be.

In addition, when the expansion member 300 is expanded, the outer circumferential surface of the central portion moves in the direction of the inner wall of the blood vessel to come into contact with the blood clot formed on the inner wall of the blood vessel, and the blood clot may be removed according to the operation of the wire-type thrombus removing apparatus 1 of the user. It becomes possible. Detailed information related to this will be described later.

Subsequently, when the push wire 200 slides along the second moving direction by pushing the inner wire 100 forward, expansion force may be applied to both ends of each helical member 310 constituting the expansion member 300. have.

The helical member 310 is unfolded from the center of the curved state by the expansion force applied to both ends, and when the helical member 310 is fully unfolded, the expansion member 300 is returned to the shape as shown in FIG. Accordingly, the gap D formed during expansion disappears again.

In some other embodiments, the wire-type thrombus removal apparatus 1 according to an embodiment of the present invention may further include a stopper (not shown) for limiting the moving distance of the push wire 200.

The stopper (not shown) may be formed to protrude at a predetermined position of the inner wire 100 such that the push wire 200 slides only a predetermined distance along the first moving direction. In this case, when the push wire 200 moves in the first direction along the length direction by a predetermined distance, the push wire 200 may be caught by a stopper (not shown) protruding from the surface of the inner wire 100, thereby limiting further movement. .

That is, the medical catheter according to another embodiment of the present invention is provided with a stopper (not shown) to properly limit the moving distance of the push wire 200, so that the expansion member 300 can be always expanded in a constant form. have. In addition, the stopper (not shown) may be provided in a detachable form with the inner wire 100 so that the expansion size of the expansion member 300 can be adjusted according to the structure of the blood vessel, the health condition of the subject.

In addition, the push wire 200 may be slid along the second moving direction by various external forces.

For example, the push wire 200 may slide along the second moving direction by the restoring force of the expansion member 300 having the elastic force. That is, each helical member 310 constituting the expansion member 300 according to an embodiment of the present invention may be formed of an elastic material or a structure capable of having an elastic force.

In this case, the expansion member 300 is expanded by receiving the contracting force as the push wire 200 moves along the first moving direction by the external force, and when the external force applied to the push wire 200 disappears, the push member 200 is pushed by the restoring force. The wire 200 may be moved to a position before receiving an external force.

As another example, the push wire 200 may be slid in the first moving direction or the second moving direction by a user manipulation. As a more specific example, when the user pulls the inner wire 100 or pushes the push wire 200, the push wire 200 is moved in a first moving direction closer to the wire tip 110 with respect to the inner wire 100. You can move your opponent along. Thereafter, the user pushes the inner wire 100 with the other hand while holding the push wire 200 with one hand, or the push wire 200 with the other hand while holding the inner wire 100 with the other hand. When pulling, the push wire 200 may move relative to the inner wire 100 in a second moving direction away from the wire tip 110.

5 and 6 are diagrams illustrating an example of performing thrombus removal using the wire-type thrombus removal apparatus 1 shown in FIG. 1.

First, as shown in FIG. 5, the operator may move the wire-type thrombus removing apparatus 1 to the blood vessel position where the thrombus is formed.

As described above, the inner wire 100 and the push wire 200 is made of a flexible tubular member so that the inner wire 100 and the push wire 200 may be inserted while being bent in correspondence with the vascular structure. In this case, the expansion member 300 may be inserted in a state in which it is expanded and contracted to both sides to prevent damage to the internal blood vessel tissue during the insertion process. In addition, when the expansion member 300 is provided with an elastic body, it is possible to maintain the maximum contraction of the expansion member 300 in the process of being inserted into the blood vessel by the restoring force.

After reaching the blood vessel in need of treatment, the operator may manipulate the inner wire 100 or the push wire 200 as shown in FIG. 6 to allow the expansion member 300 to expand.

That is, when the operator pulls the inner wire 100 or pushes the push wire 200, the push wire 200 moves in the first moving direction in the direction of the wire tip 110, and thus the expansion member 300. Retraction may be applied at both ends of the

In this case, both ends of each helical member 310 constituting the expansion member 300 may be curved by an external force, so that the center of the helical member 310 is expanded from the inner wire 100. It may extend to the vessel wall.

After the expansion member 300 is sufficiently expanded, the operator can remove the blood clot formed on the inner wall of the blood vessel by operating the wire-type blood clot removal device (1). For example, the operator may scrape the blood clot while the wire-like thrombus removing apparatus 1 is rotated clockwise or counterclockwise while the inner wire 100 is moved forward or backward along the longitudinal direction of the blood vessel.

At this time, since the wire-type thrombus removing apparatus 1 according to the embodiment of the present invention has a spiral gap D formed at predetermined intervals when the expansion member 300 is expanded, the wire-type thrombus removing apparatus 1 is separated from the inner wall of the blood vessel in the operator's operation process. The thrombi can be accommodated inside the expansion member 300. In addition, according to the degree of pulling the inner wire 100, it is possible to adjust the size of the expansion member 300 and the radial force (radial force) of the helical member 310, the convenience and stability of the procedure can be improved. .

As described above, the wire type blood clot removing device 1 according to an embodiment of the present invention has been described, and the following describes the wire type blood clot removing device according to another embodiment of the present invention with reference to FIGS. 7 and 8. Let's do it.

7 is a perspective view showing a wire-type thrombus removing apparatus 2 according to another embodiment of the present invention.

Specifically, the wire-type thrombus removing apparatus 2 according to another embodiment of the present invention is a wire tip 110, the inner wire 100, the push wire 200, the expansion member (301, 302) and the connecting member 400 ).

In this case, the wire tip 110, the inner wire 100 and the push wire 200 constituting the wire-type blood clot removal device 2 according to another embodiment of the present invention, shown in FIG. Since the wire tip 110, the inner wire 100 and the push wire 200 of the wire-type thrombus removing apparatus 1 according to an embodiment of the present invention are the same, overlapping description will be omitted.

Meanwhile, the wire-type thrombus removing apparatus 2 according to another embodiment of the present invention may be provided with a plurality of expansion members 301 and 302. In the illustrated embodiment, two expansion members 301 and 302 are illustrated, but the present invention is not limited thereto, and three or more expansion members may be provided.

Each expansion member 301, 302 has the same structure and features as the expansion member 310 shown in FIG. 1. That is, the first expansion member 301 and the second expansion member 302 constituting the wire-type thrombus removal apparatus 2 according to another embodiment of the present invention, each of the plurality of helical members 311 and 312 have internal wires. It is disposed continuously along the circumference of the diameter of 100, any one of the helical members 311, 312 may be spirally wound along the longitudinal direction of the inner wire (100).

As another example, the helical member 311 constituting the first expansion member 301 and the second expansion member 302 may be wound in directions opposite to each other. That is, the first helical members 311 constituting the first expansion member 301 are wound in a spiral in a clockwise direction along the longitudinal direction of the inner wire 100, and the second helical members 312 constitute the second expansion member 302. The helical members 312 may be wound in a counterclockwise spiral along the longitudinal direction of the inner wire 100.

In this case, the first expansion member 301 and the second expansion member 302 may be connected by the connection member 400.

The connection member 400 is a tubular member that is coaxially coupled with the inner wire 100, and specifically, may be disposed between the wire tip 110 and the push wire 200.

That is, the first expansion member 301 is coupled to one end of the connection member 400, and the second expansion member 302 is coupled to the other end of the connection member 400, such that the first expansion member 301 and the first extension member 301 are coupled to each other. The second expansion member 302 adjacent to the expansion member 301 may be disposed along the length direction of the inner wire 100.

Therefore, the wire-type thrombus removal apparatus 2 according to another embodiment of the present invention is provided with a plurality of expansion members 301 and 302 to have an effect of quickly removing a wider area of thrombus.

8 is a perspective view showing a wire-type thrombus removing apparatus 3 according to another embodiment of the present invention.

Specifically, the wire-type thrombus removing apparatus 3 according to another embodiment of the present invention includes a wire tip 110, an inner wire 100, a push wire 200, and an expansion member 303.

In this case, the wire tip 110, the inner wire 100 and the push wire 200 constituting the wire-type thrombus removing apparatus 3 according to another embodiment of the present invention, shown in FIG. 8 is shown in FIG. Since the wire tip 110, the inner wire 100 and the push wire 200 of the wire-type thrombus removing apparatus 1 according to an embodiment of the present invention, the overlapping description will be omitted.

On the other hand, the helical member 313 constituting the expansion member 303 provided in the wire-type thrombus removing apparatus 3 according to another embodiment of the present invention may be a torsion portion formed in the center.

That is, in the helical member 313 provided in the wire-type thrombus removing apparatus 3 according to another embodiment of the present invention, one end connected to the wire tip 110 and the other end connected to the push wire 200 are twisted at least once. It can be wound up in a spiral fashion. Accordingly, each helical member 313 may be formed with a twist portion according to the twist structure on one side.

Specifically, in the wire-type thrombus removing apparatus 1 according to the embodiment of the present invention shown in FIG. 1, all parts of the upper side and the lower side of the helical member are coupled with the wire tip 110 and the push wire 200. 8, the helical member 313 of the wire-type thrombus removing apparatus 3 according to another embodiment of the present invention is coupled to the wire tip 110 and the push wire 200 only at one end and the other end thereof. It is characterized by.

In this case, when the push wire 200 is slid in the first moving direction, the helical member 313 has a central portion extending in the radial direction by the contracting force applied to both ends thereof, and the proximal and distal portions have different angles around the torsion portion. Can be curved as

Accordingly, when the expansion member 303 is spirally wound and each helical member 313 having the torsion portion is expanded, any one helical member is spaced apart from the neighboring helical member along the radial circumferential direction of the inner wire 100. Vortex-shaped gaps D 'may be formed at regular intervals.

Although described above with reference to the embodiments, those skilled in the art will understand that various modifications and changes can be made within the scope of the invention without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

1, 2, 3: wire thrombus removal device
100: inner wire
110: wire tip
200: push wire
300, 301, 302, 303: expansion member
310, 311, 312, 313: helical member
400: connecting member

Claims (10)

Wire tips;
An inner wire extending in the longitudinal direction from the wire tip;
A push wire coaxially coupled to an outer circumferential surface of the inner wire and sliding along a length direction of the inner wire; And
And a helical member spirally wound along the length direction from one side of the push wire to a lower end of the wire tip, wherein the helical member is disposed continuously around the diameter of the inner wire, and the And an expansion member in which the helical member is helically expanded or contracted in response to the relative movement of the push wire.
The method of claim 1,
The push wire is,
The first moving direction is a moving direction approaching the wire tip along the longitudinal direction of the inner wire by the external force in the longitudinal direction applied to the inner wire or the second moving direction is a moving direction spaced apart from the wire tip. A wire-type thrombus removal device for sliding relative to an inner wire.
The method of claim 2,
The helical member is, when the push wire is slid in the first moving direction as the inner wire is pulled backward by the external force in the longitudinal direction, the center portion is curved in the radial direction by the contracting force applied to both ends,
When the expansion member is curved of each of the helical members wound in a spiral form, the wire-type thrombus removing apparatus is spaced apart from neighboring helical members so as to form diagonal gaps at regular intervals along a diameter circumferential direction of the inner wire. .
The method of claim 3,
As the helical member is pushed forward by an external force in a direction opposite to the direction in which the inner wire is pulled, when the push wire is slid in the second moving direction, the center portion is moved in the radial direction by the expansion force applied to both ends. Contraction,
The expansion member has a wire-like thrombus that, upon contraction of each helical member wound in a spiral manner, the curved center portion is in close contact with the inner wire to fill the diagonal gap created by the expansion of the helical member. Removal device.
The method of claim 4, wherein
The helical member,
Rectangular shape with a predetermined area,
And a wire-like thrombus removing apparatus disposed continuously along the diameter of the inner wire at intervals longer than the width of the rectangular shape so as not to overlap with the neighboring helical member upon contraction.
The method of claim 4, wherein
The helical member,
Rectangular shape with a predetermined area,
And a wire-like thrombus removing apparatus arranged continuously along the diameter circumference of the inner wire at intervals shorter than the width of the rectangular shape so that a predetermined region overlaps with a neighboring helical member upon contraction.
The method of claim 2,
The helical member is formed of an elastic material,
And the push wire is slid in the first moving direction by an external force applied to the inner wire, and when the external force is removed, the push wire is slid in the second moving direction by a restoring force of the helical member.
The method of claim 2,
And a stopper formed on an outer circumferential surface of the inner wire such that the push wire slides only a predetermined moving distance in the first moving direction.
The method of claim 2,
The helical member,
The torsion is formed in the center,
When the push wire is slid in the first movement direction, the center portion is extended in the radial direction by the contracting force applied to both ends,
When the expansion member is spirally wound and the expansion of each of the helical member is formed with the twist portion, the helical member is spaced apart from the neighboring helical member to form a vortex-shaped gap at regular intervals along the diameter circumferential direction of the inner wire Blood clot removal device.
The method of claim 2,
The expansion member is provided in plurality, any one of the expansion member is disposed along the longitudinal direction of the inner wire through a connecting member formed between the neighboring expansion member and the wire tip and the push wire, wire-like thrombus removal device .

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