KR102090392B1 - Wire type thrombectomy apparatus - Google Patents

Abstract

Wire-type thrombus removal apparatus according to the present invention, from the wire tip to the inner wire extending in the longitudinal direction, coaxially coupled to the outer peripheral surface of the inner wire to slide along the longitudinal direction and from one side of the push wire to the bottom of the wire tip Helical members spirally wound along the longitudinal direction may be continuously arranged along the diameter of the inner wire, and may include an expanding member in which the helical member expands or contracts in a spiral according to the relative movement of the push wire with respect to the inner wire. .

Description

Wire type thrombus removal device {WIRE TYPE THROMBECTOMY APPARATUS}

The present invention relates to a wire-type thrombus removal apparatus, and more particularly, to a wire-type thrombus removal apparatus that is inserted into a region of a blood vessel in which a conventional thrombus removal mechanism is difficult to access.

Thrombectomy is a treatment method that removes blood clots clogging blood vessels, and is mainly treated by removing blood clots formed on the inner wall of blood vessels by inserting blood clot removal devices into blood vessels.

The thrombus removal device may be classified into a stent type and an aspiration type according to the shape and mechanism, and all of them commonly have a microtubular catheter approaching the occluded blood vessel to pass the occluded region and then to the posterior end of the catheter. A surgical method is used to scrape or aspirate blood clots by placing the provided expansion member or the suction-type catheter at the target position.

However, the conventional thrombus removal device has a smaller diameter than a distal blood vessel or a stent or aspiration thrombus removal device that is difficult to access because the stent or aspiration-type thrombus removal device must be moved through the insertion of a tubular catheter. In the anatomical structure in which blood vessels and the above instruments are difficult to access, there is a problem that it is difficult to use for the treatment of thrombus removal.

Korean Registered Patent No. 10-1729398 Korean Patent Publication No. 10-2017-0107482

One aspect of the present invention provides a wire-type thrombus removal device that easily accesses a blood vessel structure that is difficult to access to a conventional catheter-type thrombus removal device and easily removes thrombus formed on the inner wall of the blood vessel with a simple operation.

The technical problems of the present invention are not limited to the technical problems 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 apparatus according to an embodiment of the present invention, a wire tip, an inner wire extending in the longitudinal direction from the wire tip, coaxially coupled to the outer circumferential 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 longitudinal direction from one side of the push wire to the bottom of the wire tip, wherein the helical member is continuously disposed along the diameter of the inner wire, and the inner wire And an expansion member in which the helical member expands or contracts in a spiral shape according to the relative movement of the push wire with respect to.

The push wire is a first moving direction that is a moving direction approaching toward the wire tip along a length direction of the inner wire by a longitudinal external force applied to the inner wire or a second moving direction that is spaced apart from the wire tip. It can slide relative to the inner wire along the moving direction.

In the helical member, when the push wire slides in the first movement direction as the inner wire is pulled backward by the longitudinal external force, 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 neighboring helical members at the time of bending of each of the helical members wound in a spiral shape, and a gap in a diagonal direction may be formed at regular intervals along the circumferential direction of the inner wire.

In the helical member, when the push wire slides in the second movement direction as the inner wire is pushed forward by an external force in a direction opposite to the direction in which the inner wire is pulled, the center portion is in the radial direction by the expansion force applied to both ends. When the helical member contracts, each of the helical members wound in a spiral shape may be closed, and the curved central portion may be in close contact with the inner wire, thereby filling the gap in the oblique direction created by the expansion of the helical member. have.

The helical member is a rectangular shape having a predetermined area, and may be continuously arranged along the circumference of the diameter of the inner wire at intervals longer than the width of the rectangular shape, so as not to overlap with neighboring helical members when contracted.

The helical member is a rectangular shape having a predetermined area, and may be continuously arranged along the circumference of the diameter of the inner wire at intervals shorter than the width of the rectangular shape so that a predetermined area overlaps with a neighboring helical member upon contraction.

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

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

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

The expansion member may be provided in plural, and any one expansion member may be disposed along the longitudinal 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 described above, the inner wire of the wire-type thrombus removal apparatus has a small diameter, so that the conventional thrombus removal apparatus can easily access blood vessels that are difficult to access, and the structural characteristics of the helical expansion member Due to this, blood clots can be more easily removed.

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

For a detailed description of the present invention, which will be described later, reference is made to the accompanying drawings that illustrate, by way of example, specific embodiments in which the present invention may be practiced. These examples are described in detail enough to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain shapes, structures, and properties described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. In addition, it should be understood that the location or placement of individual components within each disclosed embodiment can be changed without departing from the spirit and scope of the invention. Therefore, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention, if appropriately described, is limited only by the appended claims, along with all ranges equivalent to those claimed. In the drawings, similar reference numerals refer to the same or similar functions across various aspects.

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

1 and 2 is a perspective view showing a wire-type thrombus removal apparatus according to an embodiment of the present invention. 1 is a perspective view showing an expanded state of the wire-type thrombus removal apparatus 1 according to an embodiment of the present invention, and FIG. 2 is a wire-type thrombus removal apparatus 1 according to an embodiment of the present invention. Is a perspective view.

The wire-type thrombus removal apparatus 1 according to an embodiment of the present invention is a medical tool used for thrombectomy to remove a thrombus that is inserted through a blood vessel structure and occludes a blood vessel. In particular, a conventional thrombus removal apparatus approaches It is a device to smooth blood circulation by scraping blood clots that are inserted into difficult blood vessels and blocking blood vessels.

Specifically, the wire-type thrombus removal 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 extension member 300.

The inner wire 100 is a thin wire-like member having flexibility and flexibility. Due to this feature, the inner wire 100 can be bent depending on the structure of the blood vessel when inserted into the blood vessel, and can move to a specific position within the blood vessel, and can be used to access a microvascular or complex blood vessel that was difficult to access to a conventional tubular catheter. Easy access.

The wire tip 110 is a member that extends to the distal end of the inner wire 100 and may be provided in a conical shape that can easily pass through blood vessels occluded by thrombus. The diameter of the wire tip 110 may be formed to be larger than the diameter of the inner wire 100 and smaller or equal to the diameter of the push wire 200 to be described later. That is, the wire-type thrombus removal apparatus 1 according to an embodiment of the present invention minimizes the diameter of the wire tip 110 to facilitate access to the inside of a blood vessel having a relatively small diameter, but of the inner wire 100 described later. In the folded member 300 formed on the outer circumferential surface, it is possible to prevent unnecessary contact with the inner wall of the blood vessel.

The push wire 200 is a flexible tubular member. The push wire 200 is formed with a through hole in the longitudinal 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, and accordingly, the push wire 200 can slide along the longitudinal direction of the inner wire 100.

The extension member 300 is a member formed along the length 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 according to sliding of the push wire 200.

The helical member 310 is a member made of a metal material spirally wound along the longitudinal 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 diameter of the inner wire 100 (eg, clockwise or counterclockwise). In this case, each helical member 310 is provided in a rectangular shape having the same area, and 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 smaller than the width of the helical member 310. Alternatively, the arrangement interval of each helical member 310 does not overlap with the adjacent helical member 310 when the expansion member 300 contracts, so that the inner wire 100 is disposed at intervals longer than the width of the helical member 310. It may be arranged continuously along the circumference of the diameter.

Each helical member 310 may be bent in the radial direction of the inner wire 100 or unfolded in the longitudinal direction according to the relative movement of the push wire 200 with respect to the inner wire 100, and accordingly a plurality of helical members ( 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 removal apparatus 1 shown in FIG. 1.

As described above, the expansion or contraction of the expansion member 300 is determined by sliding of the push wire 200. Specifically, when an external force in the longitudinal direction is applied to the inner wire 100, depending on the direction of the applied external force The extension member 300 may be expanded or contracted while the push wire 200 is advanced or reversed along the longitudinal direction of the inner wire 100.

3 is a view showing 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 expanded state along the circumference of the diameter of the inner wire 100. . Specifically, any one of the helical members 310 may be continuously disposed along the circumference of the diameter of the inner wire 100 in a state in which a predetermined area overlaps with the neighboring helical members 310.

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

In this state, as illustrated in FIG. 4, when the inner wire 100 is pulled backward or when the push wire 200 is pushed toward the wire tip 110, the push wire 200 is with respect to the inner wire 100 The wire tip 110 is moved relative to the direction in which it is formed.

Hereinafter, for convenience of explanation, an external force is applied to the inner wire 100 or the push wire 200, and the moving direction in which the push wire 200 approaches the wire tip 110 from the original position is the first moving direction. In the definition, an external force is applied to the inner wire 100 or the push wire 200, and the moving direction in which the push wire 200 is spaced apart from the wire tip 110 from the original position is defined as a 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, a contraction force is applied to each helical member 310 constituting the expansion member 300. This is applied.

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 contractive force is applied to the helical member 310, both ends of the fixedly coupled ends approach each other and the center is inside It can rise in the radial direction of the wire.

As the central portion of each helical member 310 rises, the expansion member 300 may be expanded in the shape of an elliptical sphere (rugby ball) with a convex center portion with a fixed diameter at both ends.

Meanwhile, as the central portion of the helical member 310 is curved and raised by the contracting force, the central portion of the helical member 310 adjacent to any one of the helical members 310 may be spaced apart. Accordingly, when the contractive force is applied to each helical member 310 wound in a spiral manner, the expansion member 300 is formed with a gap D in a diagonal direction at regular intervals along the circumferential direction of the diameter of the inner wire 100. You can.

In addition, when the expansion member 300 is expanded, the outer circumferential surface of the center moves in the direction of the inner wall of the blood vessel to contact the thrombus formed on the inner wall of the blood vessel, and the thrombus can be removed according to the operation of the user's wire-type thrombus removal apparatus 1 It becomes possible. Details related to this will be described later.

Then, when the push wire 200 slides along the second movement direction by pushing the inner wire 100 forward, an 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 central portion by the expansion force applied to both ends, and when the helical member 310 is fully unfolded, the expanding member 300 returns to a shape as shown in FIG. 3. Accordingly, the gap D formed upon 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) that limits the movement distance of the push wire 200.

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

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

Further, the push wire 200 may be slid along the second movement direction by various external forces.

As an example, the push wire 200 may slide along the second movement direction by the restoring force of the elastic expansion member 300. 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 contraction force as the push wire 200 moves along the first movement direction by an external force, and when the external force applied to the push wire 200 disappears, the push wire 200 pushes it. The wire 200 may be moved to a position before receiving external force.

As another example, the push wire 200 may be slid in the first movement direction or the second movement direction by 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 in a first movement direction closer to the wire tip 110 direction with respect to the inner wire 100 Can move relative. Thereafter, the user pushes the inner wire 100 with the other hand while holding the push wire 200 with one hand, or push the wire 200 with the other hand while holding the inner wire 100 with one hand. When pulling, the push wire 200 may move relative to the inner wire 100 along a second movement direction away from the wire tip 110.

5 and 6 are views showing an example of performing a thrombectomy using the wire-type thrombus removal apparatus 1 shown in FIG. 1.

First, as shown in FIG. 5, the operator can move the wire-type thrombus removal device 1 to the location of the blood vessel where the thrombus is formed.

As described above, the inner wire 100 and the push wire 200 are formed of a flexible tubular member and can be inserted while being bent corresponding to a blood vessel structure. At this time, the expansion member 300 is expanded to both sides as much as possible and inserted in a contracted state to prevent the blood vessel internal tissue from being damaged in the insertion process. In addition, when the expansion member 300 is provided with an elastic body, the maximum contraction of the expansion member 300 can be maintained even 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 operate 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, which is the direction of the wire tip 110, and accordingly, the expansion member 300 Shrinking force may be applied to 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 can extend to the inner walls of blood vessels.

After the expansion member 300 is sufficiently expanded, the operator can remove the thrombus formed on the inner wall of the blood vessel by operating the wire-type thrombus removal device 1. For example, the operator may scrape the thrombus while rotating or moving the inner wire 100 along the longitudinal direction of the blood vessel while rotating the wire-type thrombus removal device 1 clockwise or counterclockwise.

At this time, since the wire-type thrombus removal apparatus 1 according to an embodiment of the present invention has a spiral gap D formed at predetermined intervals when the expansion member 300 is expanded, it deviates from the inner wall of the blood vessel during the operator's manipulation. The thrombus can be accommodated inside the expansion member 300. Further, according to the degree of pulling the inner wire 100, the size of the expansion member 300 and the radial force of the helical member 310 can be adjusted, so that the convenience and stability of the procedure can be improved. .

As described above, the wire-type thrombus removal apparatus 1 according to an embodiment of the present invention has been described, and the wire-type thrombus removal apparatus according to another embodiment of the present invention will be described below with reference to FIGS. 7 and 8. I will do it.

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

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

At this time, the wire tip 110, the inner wire 100 and the push wire 200 constituting the wire-type thrombus removal apparatus 2 according to another embodiment of the present invention shown in FIG. 7 are shown in FIG. Since the wire tip 110, the inner wire 100 and the push wire 200 of the wire-type thrombus removal apparatus 1 according to an embodiment of the present invention are the same, redundant description will be omitted.

On the other hand, the wire-type thrombus removal apparatus 2 according to another embodiment of the present invention may be provided with a plurality of expansion members (301, 302). In the illustrated embodiment, the expansion members 301 and 302 are illustrated as being provided in two, but the present invention is not limited thereto, and three or more expansion members may be provided.

Each of the expansion members 301 and 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 have a plurality of helical members 311 and 312, respectively. It is continuously arranged along the circumference of the diameter of 100, and any one of the helical members 311 and 312 may be spirally wound along the longitudinal direction of the inner wire 100.

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

At this time, the first expansion member 301 and the second expansion member 302 may be connected by a connection member 400.

The connecting member 400 is a tubular member that is coaxially coupled to the inner wire 100, and may be specifically 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, the second expansion member 302 is coupled to the other end of the connection member 400, the first expansion member 301 and the first The second expansion member 302 adjacent to the expansion member 301 may be disposed along the longitudinal 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, which has an effect of rapidly removing a thrombus in a larger area.

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

Specifically, the wire-type thrombus removal 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 extension member 303.

At this time, the wire tip 110, the inner wire 100 and the push wire 200 constituting the wire-type thrombus removal apparatus 3 according to another embodiment of the present invention shown in FIG. 8 are illustrated in FIG. 1. Since the same as the wire tip 110, the inner wire 100, and the push wire 200 of the wire-type thrombus removal apparatus 1 according to an embodiment of the present invention, redundant description will be omitted.

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

That is, in the helical member 313 provided in the wire-type thrombus removal 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 in a spiral. Accordingly, each of the helical members 313 may be formed with a twist portion according to the twist structure on one side.

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

In this case, when the push wire 200 is slid in the first moving direction, the helical member 313 expands in the radial direction by the center portion by the contracting force applied to both ends, and the proximal portion and the distal portion are different angles around the torsional portion. Can be curved into.

Accordingly, the expansion member 303 is wound in a spiral shape, and when the helical member 313 is formed, the torsional part is formed, and any one helical member is spaced apart from the adjacent helical member along the diameter circumferential direction of the inner wire 100. A vortex-shaped gap D 'may be formed at regular intervals.

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

1, 2, 3: Wire type thrombus removal device
100: inner wire
110: wire tip
200: push wire
300, 301, 302, 303: expansion member
310, 311, 312, 313: no helical
400: connecting member

Claims (10)

Wire tip;
An inner wire extending in the longitudinal direction from the wire tip;
A push wire coaxially coupled to the outer circumferential surface of the inner wire and sliding along the longitudinal direction of the inner wire; And
And a helical member spirally wound along the lengthwise direction from one side of the push wire to the bottom of the wire tip, wherein the helical member is continuously disposed along the diameter of the inner wire, and The helical member in accordance with the relative movement of the push wire includes an expansion member that expands or contracts in a spiral,
The helical member,
It has a rectangular shape with a certain area,
The wire-type thrombus removal device is continuously arranged along the circumference of the inner wire at intervals longer than the width of the rectangular shape, so as not to overlap with neighboring helical members upon contraction.
Wire tip;
An inner wire extending in the longitudinal direction from the wire tip;
A push wire coaxially coupled to the outer circumferential surface of the inner wire and sliding along the longitudinal direction of the inner wire; And
And a helical member spirally wound along the longitudinal direction from one side of the push wire to the bottom of the wire tip, wherein the helical member is continuously disposed along the diameter of the inner wire, and the inner wire is The helical member in accordance with the relative movement of the push wire includes an expansion member that expands or contracts in a spiral,
The helical member,
It has a rectangular shape with a certain area,
The wire-type thrombus removal device is continuously arranged along the circumference of the inner wire at intervals shorter than the width of the rectangular shape, so that a predetermined area overlaps with a neighboring helical member upon contraction.
The method according to claim 1 or 2,
The push wire,
The first movement direction, which is a movement direction approaching the wire tip along the length direction of the inner wire by the external force in the longitudinal direction applied to the inner wire, or the second movement direction, which is a movement direction spaced apart from the wire tip, is A wire-type thrombus removal device sliding relative to the inner wire.
According to claim 3,
In the helical member, when the push wire slides in the first movement direction as the inner wire is pulled backward by the longitudinal external force, the center portion is curved in the radial direction by the contracting force applied to both ends,
The extension member, when bending each of the helical members wound in a spiral, spaced apart from neighboring helical members to form a gap in a diagonal direction at regular intervals along the diameter circumferential direction of the inner wire, the wire-type thrombus removal device .
According to claim 4,
In the helical member, when the push wire is slid in the second movement direction as the inner wire is pushed forward by an external force in a direction opposite to the direction in which the inner wire is pulled, the center portion is in the radial direction by the expansion force applied to both ends. Shrinking,
In the expansion member, when the respective helical members wound in a spiral are contracted, the curved central portion is in close contact with the inner wire to fill in the gap in the diagonal direction created by the expansion of the helical member, a wire-type thrombus. Removal device.
delete According to claim 3,
The helical member is formed of an elastic material,
The push wire, after sliding in the first movement direction by an external force applied to the inner wire, when the external force is removed, sliding in the second movement direction by the restoring force of the helical member, wire-type thrombus removal device.
According to claim 3,
And a stopper formed on an outer circumferential surface of the inner wire so that the push wire slides only by a predetermined movement distance in the first movement direction.
According to claim 3,
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 expanded in the radial direction by the contracting force applied to both ends,
When the expansion member is wound in a spiral shape and the respective helical members are formed while the torsion is formed, the helical members are spaced apart from neighboring helical members to form a vortex-shaped gap at regular intervals along the diameter circumferential direction of the inner wire. Type thrombus removal device.
The method according to claim 1 or 2,
The expansion member is provided in plural, and any one expansion member is disposed along the longitudinal direction of the inner wire through a connecting member formed between a neighboring expansion member and the wire tip and the push wire, a wire-type thrombus removal device .

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