JP7598822B2 - Foreign object capture device and foreign object capture system - Google Patents

Description

The technology disclosed in this specification relates to a foreign body capture device and a foreign body capture system for capturing foreign bodies that occur in body cavities such as blood vessels.

A foreign body capture device is known that includes a mesh member for inserting into a body cavity such as a blood vessel (e.g., a blood vessel) to capture a foreign body (e.g., a thrombus) in the body cavity (see Patent Documents 1 and 2 below). The foreign body capture device includes a wire and a mesh member joined to the tip of the wire. The mesh member is a cylindrical member formed to be self-expandable in the radial direction. A resin film is formed over the entire mesh member from the tip to the base end. The foreign body capture device is guided to the vicinity of a lesion in the body cavity where a foreign body is present while being inserted into, for example, a hollow shaft with the mesh member in a radially contracted state (hereinafter referred to as the "contracted state"). Next, the mesh member protrudes from the tip of the shaft, so that the mesh member self-expands in the radial direction (hereinafter referred to as the "expanded state"), and the foreign body is captured in the mesh member from the tip opening of the mesh member.

International Publication No. 2015/189354 JP 2019-5143 A

In the above-mentioned conventional foreign body capture device, the resin film is formed over the entire mesh member from the tip to the base end. Therefore, the presence of the resin film makes it difficult for the entire mesh member to deform, and as a result, the mesh member does not smoothly change from a contracted state to an expanded state, which may reduce the expandability of the mesh member.

This specification discloses a technology that can solve the above-mentioned problems.

The technology disclosed in this specification can be realized, for example, in the following forms:

(1) The foreign body capture device disclosed in this specification is a foreign body capture device, comprising a wire, a cylindrical mesh member formed to be self-expandable in the radial direction, the base end of which is joined to the tip of the wire, and a resin film formed on the entire circumference of the mesh member from a first position located a first length away from the base end of the mesh member to a second position located more distally than the first position. In this foreign body capture device, the resin film is not formed on the portion of the mesh member from the base end of the mesh member to the first position located a first length away from the tip. Therefore, compared to a configuration in which a resin film is formed on the entire mesh member, the base end side of the mesh member is more easily deformed, and the mesh member can be smoothly expanded from a contracted state to an expanded state.

(2) In the above foreign body capture device, the base end of the mesh member may be configured to be closed. In this foreign body capture device, the base end of the mesh member is closed. Therefore, when this foreign body capture device is used in combination with another medical device, it is possible to prevent the base end of the mesh member from coming into contact with the other medical device and being damaged.

(3) In the above foreign body capture device, the second position may be configured to be a position closer to the base end than the tip of the mesh member. In this foreign body capture device, no resin film is formed on the tip end portion of the mesh member. Therefore, compared to a configuration in which a resin film is formed on the entire mesh member, the mesh member is more likely to deform not only on the base end side but also on the tip end side, and the mesh member can be expanded more smoothly from the contracted state.

(4) In the above foreign body capture device, when the mesh member is in an expanded state, the opening angle of the portion of the mesh member from the tip to the second position may be smaller than the opening angle of the portion of the mesh member from the second position to the base end side by a second length. In this foreign body capture device, damage to the body cavity wall can be suppressed by gently contacting the tip side of the mesh member on which the resin film is not formed with the body cavity wall.

(5) In the above foreign body capture device, when the mesh member is in an expanded state, the opening angle of the distal end of the portion of the mesh member on which the resin film is formed may be larger than the opening angle of the proximal end of the portion on which the resin film is formed. In this foreign body capture device, the area of the mesh member that comes into contact with the body cavity wall can be reduced, thereby suppressing damage to the body cavity wall.

(6) The foreign body capture system may include a hollow shaft and any one of the foreign body capture devices (1) to (5) above, and the mesh member may be configured to be accommodated within the shaft in a radially contracted state and to be self-expanded radially at a position distal to the shaft. With this foreign body capture system, when the mesh member of the foreign body capture device is protruded from the tip of the shaft, the mesh member can be smoothly expanded from the contracted state to the expanded state.

(7) In the above foreign body capture system, the mesh member may be configured such that, in an expanded state, the outer diameter at a third position between the first position and the second position is approximately equal to the inner diameter of the tip of the shaft. With this foreign body capture system, when a foreign body is sucked in by suction force from the base end side of the shaft, the adhesion between the mesh member and the shaft is improved, so that suction force can be applied to the foreign body efficiently.

The technology disclosed in this specification can be realized in various forms, such as a foreign object capture device, a foreign object capture system including the foreign object capture device, a method of using the foreign object capture device, or a method of manufacturing the foreign object capture device.

FIG. 1 is an explanatory diagram illustrating a schematic configuration of a foreign object capture system 100 according to an embodiment. FIG. 1 is an explanatory diagram showing a method of using the foreign object capture system 100. FIG. 2 is an explanatory diagram showing a method of using the foreign object capture system 100.

A. Embodiments:
A-1. Overall configuration of the foreign object capture system 100:
FIG. 1 is an explanatory diagram showing a schematic configuration of a foreign body capturing system 100 in this embodiment. In FIG. 1, a schematic configuration of a side of a foreign body capturing device 10 described later in the foreign body capturing system 100 is shown, and a schematic configuration of a longitudinal section of a catheter shaft 50 described later is shown. Here, the longitudinal section of the catheter shaft 50 refers to a section (YZ section in FIG. 1) parallel to the axial direction (longitudinal direction Z-axis direction in FIG. 1) of the catheter shaft 50 (foreign body capturing system 100). In FIG. 1, the Z-axis positive side (the side of a mesh member 20 described later) is the tip side (distal side) inserted into the body, and the Z-axis negative side (opposite side to the mesh member 20) is the base end side (proximal side) operated by a technician such as a doctor. Note that FIG. 1 shows a state in which the foreign body capturing system 100 is linearly parallel to the Z-axis direction as a whole, but the foreign body capturing system 100 has flexibility to the extent that it can be bent.

The foreign body capture system 100 of this embodiment is a medical device that is inserted into a body cavity (such as the blood vessels of the brain or heart) to capture a foreign body M that has developed in a lesion (such as an obstruction) in the body cavity. Specifically, the foreign body capture system 100 includes a foreign body capture device 10 and a catheter shaft 50.

As shown in FIG. 1, the foreign object capture device 10 includes a wire 12 and a mesh member 20. The wire 12 is a linear member and is made of a metal such as stainless steel. The wire 12 is a solid body. In FIG. 1, the central axis O of the foreign object capture device 10 is indicated by a dashed line. That is, the central axis of the wire 12 and the central axis of the mesh member 20 are approximately coincident (in other words, the wire 12 and the mesh member 20 are arranged so as to be approximately coaxial).

The mesh member 20 is a cylindrical member (stent) that is formed to be self-expandable in the radial direction. The mesh member 20 is a braided body formed into a cylindrical shape by braiding multiple wires. In this specification, "cylindrical" does not necessarily mean a completely cylindrical shape, but may also mean an approximately cylindrical shape overall (approximately cylindrical, for example, a slightly conical shape or a shape with some unevenness).

Specifically, the mesh member 20 has a plurality of first strands 21 and a plurality of second strands 23. The first strands 21 and the second strands 23 are wound in a spiral shape around the central axis O of the foreign body capture device 10. The winding directions of the first strands 21 and the second strands 23 are opposite to each other, and are arranged to cross each other. With this configuration, the mesh member 20 is formed so as to be capable of expanding and contracting in the radial direction. That is, when an external force is applied from the radial outside to the radial inside, the mesh member 20 is in a radially contracted state (see FIG. 3(E) described later, hereinafter referred to as the "contracted state"), and in a natural state in which the application of the external force is released, the mesh member 20 is in a radially expanded state (see FIG. 1, FIG. 2(C) and FIG. 3(D), hereinafter referred to as the "expanded state"). The mesh member 20 is made of a metal or resin such as stainless steel (SUS304), a superelastic alloy (e.g., Ni-Ti alloy), or a radiopaque material (e.g., tungsten or Co-Cr alloy).

The tip of the mesh member 20 is open, and the base end of the mesh member 20 is gathered and joined to the tip of the wire 12. In other words, the outside diameter of the base end of the mesh member 20 is reduced compared to the tip of the mesh member 20, and the base end is arranged to surround the tip of the wire 12 and joined to the wire 12. In this embodiment, the base end of the mesh member 20 and the tip of the wire 12 are joined by welding. The joint between the base end of the mesh member 20 and the tip of the wire 12 is reinforced by wrapping a coil-shaped protective member 60 around the welded portion between the mesh member 20 and the wire 12. That is, since the protective member 60 is wrapped around the welded portion, stress concentration at the joint portion and kinking are suppressed. The joint between the base end of the mesh member 20 and the tip of the wire 12 is not limited to welding, and other joining methods (such as joining by soldering or joining by adhesive) may be used. The protective member 60 is not limited to being coil-shaped, but may be tubular, and may be formed of a metal material or a resin material.

With this configuration, the tip of the mesh member 20 is open so that it can expand and contract in the radial direction, and the base end of the mesh member 20 is joined together to the wire 12 and is closed so that it cannot expand and contract in the radial direction. As described above, the mesh member 20 and the wire 12 are arranged so as to be approximately coaxial. Therefore, when the foreign body capture device 10 is viewed from the tip side (positive Z-axis direction side) of the foreign body capture system 100 in FIG. 1, when the mesh member 20 transitions from a contracted state to an expanded state, the mesh member 20 opens radially from the wire 12 as the center, that is, toward the radial outside of the mesh member 20. The detailed configuration of the mesh member 20 will be described later.

The catheter shaft 50 is a hollow body with a tubular (e.g., cylindrical) shape and an opening at the tip and base end. A lumen 52 is formed inside the catheter shaft 50, extending from the tip to the base end of the catheter shaft 50. For example, a guide wire 70 (see FIG. 2A) described below is inserted into the lumen 52. As described below, the catheter shaft 50 functions as a suction catheter that sucks in foreign matter M using an airflow F (see FIG. 3C) that flows from the opening at the tip of the catheter shaft 50 to the base end side. The catheter shaft 50 is formed from a material such as polyamide, polyamide elastomer, polyolefin, polyester, polyester elastomer, or a metal such as stainless steel (SUS304) or a superelastic alloy (e.g., Ni-Ti alloy).

A-2. Detailed configuration of mesh member 20:
1, the mesh member 20 in the expanded state has a generally conical shape with an outer diameter increasing toward the tip. Specifically, the mesh member 20 has a distal portion 22, an intermediate portion 26, and a proximal portion 24.

The distal end portion 22 of the mesh member 20 is a cylindrical portion including the distal end of the mesh member. The distal end portion 22 is generally conical in shape, with the outer diameter increasing continuously toward the distal end of the mesh member 20. When the mesh member 20 is in an expanded state, the minimum outer diameter D1 of the distal end portion 22 (the outer diameter of the base end of the distal end portion 22, e.g., 3 mm or more and 6 mm or less) is equal to or greater than the inner diameter of the body cavity (blood vessel, etc.) into which the foreign body capture device 10 is inserted. The distal end portion 22 does not have a resin film 30 (described later) formed thereon, and the first wire 21 and the second wire 23 are exposed to the inner and outer periphery of the mesh member 20.

The base end portion 24 of the mesh member 20 is a cylindrical portion including the base end of the mesh member. The base end portion 24 is substantially conical in shape, with the outer diameter continuously increasing toward the tip of the mesh member 20. The opening angle θ2 of the base end portion 24 is substantially the same as the opening angle θ1 of the tip portion 22. In this specification, the "opening angle" of a given portion is the inclination angle of the given portion with respect to the direction in which the central axis O of the mesh member 20 extends from the base end portion 24 to the tip portion 22 of the mesh member 20 (the positive direction of the Z axis in FIG. 1). The maximum value D4 of the outer diameter of the base end portion 24 (the outer diameter of the tip of the base end portion 24, for example, 1 mm or more and 3 mm or less) is smaller than the minimum value D1 of the outer diameter of the tip portion 22. The resin film 30 is not formed on the base end portion 24, and the first wire 21 and the second wire 23 are exposed to the inner and outer periphery of the mesh member 20. The length of the base end portion 24 in the direction of the central axis O is an example of the first length in the claims.

The intermediate portion 26 of the mesh member 20 is located between the distal end portion 22 and the proximal end portion 24, and is a tubular portion connecting the distal end portion 22 and the proximal end portion 24. A thin and flexible resin film 30 is formed around the entire circumference of the intermediate portion 26. That is, in the intermediate portion 26, the mesh formed by the first wire 21 and the second wire 23 is blocked by the resin film 30. The resin film 30 is formed so as to cover at least one of the inner and outer circumferential sides of the intermediate portion 26. The resin film 30 is formed from a resin such as polyethylene, polyurethane, polyurethane elastomer, polyamide, polyamide elastomer, polyolefin, polyester, or polyester elastomer. The intermediate portion 26 is an example of a portion in which a resin film is formed in the claims. Additionally, in the direction of the central axis O of the mesh member 20 (the Z-axis direction in FIG. 1), the boundary position between the distal portion 22 and the intermediate portion 26 is an example of the second position in the scope of the claims, and the boundary position between the intermediate portion 26 and the proximal portion 24 is an example of the first position in the scope of the claims.

In the expanded state of the mesh member 20, the opening angle θ3 at the tip side of the intermediate portion 26 is larger than the opening angle θ4 at the base end side of the intermediate portion 26. Specifically, the intermediate portion 26 has a first intermediate portion 26A and a second intermediate portion 26B. The first intermediate portion 26A is a portion that includes the tip of the intermediate portion 26. The second intermediate portion 26B is located on the base end side of the first intermediate portion 26A and is a portion that includes the base end of the intermediate portion 26. The opening angle θ3 of the first intermediate portion 26A is larger than the opening angle θ4 of the second intermediate portion 26B. The opening angle θ3 of the first intermediate portion 26A is larger than the opening angle θ1 of the tip side portion 22 and is also larger than the opening angle θ2 of the base end side portion 24. The opening angle θ4 of the second intermediate portion 26B is approximately the same as the opening angle θ1 of the distal portion 22, and is also approximately the same as the opening angle θ2 of the proximal portion 24.

When the mesh member 20 is in an expanded state, the outer diameter D5 at a position between the tip and base end of the intermediate portion 26 is approximately the same as the inner diameter D6 (e.g., 0.8 mm or more and 3 mm or less) of the tip of the catheter shaft 50. Specifically, the outer diameter D5 at a position between the tip and base end of the second intermediate portion 26B of the intermediate portion 26 is approximately the same as the inner diameter D6 of the tip of the catheter shaft 50. The above position of the outer diameter D5 is an example of the third position in the claims.

In this embodiment, the length of the intermediate portion 26 in the direction of the central axis O (e.g., 20 mm or more and 150 mm or less) is longer than the length of the tip portion 22 in the direction of the central axis O, and is also longer than the length of the base portion 24 in the direction of the central axis O. The length of the first intermediate portion 26A in the direction of the central axis O is shorter than the length of the second intermediate portion 26B in the direction of the central axis O. The length of the first intermediate portion 26A in the direction of the central axis O is an example of the second length in the claims.

The tip of the mesh member 20 is open, whereas the base end of the mesh member 20 is closed. That is, as described above, the base ends of the mesh member 20 are gathered together and joined to the tip of the wire 12.

In this embodiment, the mesh member 20 has X-ray opaque marks 40 and 42 at the distal end and proximal end, respectively. Specifically, the mesh member 20 has a plurality of (e.g., three or more) X-ray opaque marks 40 at the distal end, which are equally spaced in the circumferential direction around the central axis O of the mesh member 20. The mesh member 20 has an annular X-ray opaque mark 42 at its proximal end, which surrounds the proximal end of the mesh member 20. The catheter shaft 50 has an annular X-ray opaque mark 54. The X-ray opaque marks 40, 42, and 54 are formed of a radiopaque material such as platinum, gold, tungsten, or an alloy thereof. Instead of providing the X-ray opaque mark 42, the protective member 60 may be formed of the above-mentioned radiopaque material.

A-3. Example of use of the foreign object capture system 100:
2 and 3 are explanatory diagrams showing a method of using the foreign body capture system 100. For convenience, the size relationships of the various portions of the mesh member 20 in Fig. 2 and Fig. 3 are different from those in Fig. 1.

The foreign body capture system 100 is used to capture and remove a foreign body M that blocks a blood vessel B in the brain region, for example, in the treatment of cerebral infarction. First, as shown in FIG. 2(A), the catheter shaft 50 is inserted into the lumen 82 of the cylindrical guiding catheter 80 along the guide wire 70, and is carried to the vicinity of the lesion where the foreign body M is present by protruding from the tip of the guiding catheter 80. Next, as shown in FIG. 2(B), the guide wire 70 is removed from the catheter shaft 50, and the foreign body capture device 10 is inserted into the lumen 52 of the catheter shaft 50 and carried to the vicinity of the lesion closer to the catheter shaft 50. The tip of the catheter shaft 50 protrudes from the tip of the guiding catheter 80, and the X-ray opaque mark 54 is exposed to the outside of the guiding catheter 80.

2C, the mesh member 20 of the foreign body capture device 10 is in a contracted state when it is extended in the lumen 52 of the catheter shaft 50 by being pressed from the inner circumferential surface of the shaft 50, but when it protrudes from the tip of the catheter shaft 50, the mesh member 20 is released from the pressure from the inner circumferential surface of the catheter shaft 50, and changes from the contracted state to an expanded state at a position in front of the foreign body M, and the tip of the mesh member 20 opens widely. The outer peripheries of the tip side portion 22 of the mesh member 20 and the first intermediate portion 26A of the intermediate portion 26 contact the inner wall of the blood vessel B over the entire circumference. That is, the mesh member 20 is fixed in a state in which the outer peripheries of the tip side portion 22 and the first intermediate portion 26A of the intermediate portion 26 open widely and contact the inner wall of the blood vessel B. In addition, the outer periphery of the second intermediate portion 26B of the intermediate portion 26 of the mesh member 20 is in a state of contact with the opening of the catheter shaft 50 over the entire circumference. This contact state can be determined, for example, by confirming with an X-ray that the X-ray opaque mark 42 on the foreign body capture device 10 and the X-ray opaque mark 54 on the catheter shaft 50 overlap.

With the outer periphery of the intermediate portion 26 of the mesh member 20 in contact with the opening of the catheter shaft 50 over the entire circumference, for example, a suction pump is attached to the base end of the catheter shaft 50 and operated to apply suction force (negative pressure) to the catheter shaft 50 toward the base end of the catheter shaft 50. This generates an airflow F that flows in from the tip side of the mesh member 20, passes through the intermediate portion 26, and flows from the stitches of the base end portion 24 into the lumen 52 of the catheter shaft 50.

In addition, the generation of the airflow F generates a force that sucks the foreign object M into the mesh member 20, and as shown in FIG. 3(D), the foreign object M is sucked into the mesh member 20. Next, as shown in FIG. 3(E), the mesh member 20, which protrudes from the catheter shaft 50 and captures the foreign object M, is pulled into the guiding catheter 80 together with the catheter shaft 50, so that the mesh member 20, while capturing the foreign object M, is recovered into the lumen 82 of the guiding catheter 80 while changing from an expanded state to a contracted state. In FIG. 3(D) and FIG. 3(E), the mesh member 20 into which the foreign object M has been sucked is pulled into the guiding catheter 80 together with the catheter shaft 50, but the catheter shaft 50 containing the mesh member 20 may be pulled into the guiding catheter 80 after the mesh member 20 protrudes from the catheter shaft 50 and captures the foreign object M is pulled into the catheter shaft 50. In addition, as described above, the mesh member 20 and the wire 12 are arranged approximately coaxially. Therefore, when the foreign body M captured by the mesh member 20 is pulled into the guiding catheter 80 or the catheter shaft 50, it is pulled by a substantially equal force from the mesh member 20 at the contact point with the mesh member 20 in the circumferential direction. As a result, it is possible to prevent the foreign body M from falling out of the mesh member 20. Through the above-described series of steps, the foreign body M can be removed from the blood vessel B.

According to the foreign body capture system 100 of this embodiment, for example, in the treatment of cerebral embolism, it is possible to both prevent distal occlusion of fragile red thrombi and remove hard and slippery white thrombi. That is, if the foreign body M is a red thrombi, if the red thrombi are crushed, fine fragments of the red thrombi may flow to the distal part of the blood vessel B and cause occlusion. In contrast, the foreign body capture system 100 of this embodiment is configured to capture the foreign body M by suction in the mesh member 20 without crushing it, so it is possible to prevent distal occlusion of the red thrombi. On the other hand, if the foreign body M is a white thrombi, it is difficult to entangle the white thrombi in the mesh of the mesh member 20, and it is difficult to capture it by the mesh member 20 alone. In contrast, the foreign body capture system 100 of this embodiment is configured to capture the foreign body M by suction in the mesh member 20, so it is also possible to remove the white thrombi.

A-4. Advantages of this embodiment:
As described above, in the foreign body capturing device 10 of this embodiment, the resin film 30 is not formed on the base end portion 24 of the mesh member 20. Therefore, compared to a configuration in which a resin film is formed on the entire mesh member, the base end side of the mesh member 20 is more easily deformed, and the mesh member 20 can be smoothly changed from a contracted state to an expanded state.

In this embodiment, the tip of the mesh member 20 is open, whereas the base end of the mesh member 20 is closed. That is, the outside diameter of the base end of the mesh member 20 is smaller than that of the tip of the mesh member 20, and the base end is arranged to surround the tip of the wire 12 and is joined to the wire 12. Therefore, when the foreign body capture device 10 is used, it is possible to prevent the base end of the mesh member 20 from coming into contact with the inner surface of the catheter shaft 50 and being damaged. That is, it is possible to improve the durability of the mesh member 20.

In this embodiment, no resin film is formed on the distal end portion 22 of the mesh member 20. Therefore, compared to a configuration in which a resin film is formed on the entire mesh member, the distal end side as well as the proximal end side of the mesh member 20 is more easily deformed, and the mesh member 20 can be expanded more smoothly from a contracted state. Also, as described above, since no resin film is formed on the distal end portion 22, the distal end of the mesh member 20 is more likely to open widely, and the outer peripheral surface of the distal end portion 22 is more likely to be fixed to the inner wall of the blood vessel B.

In this embodiment, when the mesh member 20 is in an expanded state, the outer periphery of the distal end portion 22 and the first intermediate portion 26A of the intermediate portion 26 is opened widely and fixed in contact with the inner wall of the blood vessel B. This makes it possible to prevent fragments of the foreign body M from flowing out of the catheter shaft 50 through the gap between the mesh member 20 and the inner wall of the blood vessel B due to suction through the catheter shaft 50. Furthermore, it is also possible to prevent fragments of the foreign body M from passing through the meshes of the mesh member 20 and flowing out of the catheter shaft 50 (see FIG. 2C).

In this embodiment, no resin film is formed on the base end portion 24 of the mesh member 20. Therefore, when expanding the mesh member 20 to aspirate the foreign body M, suction force can be applied to the foreign body M without waste simply by positioning the mesh member 20 so that the outer periphery of the second intermediate portion 26B is in contact with the opening of the catheter shaft 50 over the entire circumference. In other words, when expanding the mesh member 20 to aspirate the foreign body M, the mesh member 20 can be positioned so that suction force is applied to the foreign body M without waste with a relatively simple operation. As a result, the procedure to remove the foreign body M can be carried out efficiently.

In this embodiment, when the mesh member 20 is in an expanded state, the opening angle θ1 of the tip portion 22 is smaller than the opening angle θ3 of the first intermediate portion 26A. This allows the tip portion 22 of the mesh member 20, on which no resin film is formed, to gently contact the inner wall of the blood vessel B, thereby suppressing damage to the inner wall of the blood vessel B.

In this embodiment, when the mesh member 20 is in an expanded state, the opening angle θ3 at the tip side of the intermediate portion 26 is larger than the opening angle θ4 at the base end side of the intermediate portion 26. This makes it possible to reduce the area of the intermediate portion 26 that contacts the inner wall of the blood vessel B when the mesh member 20 is in an expanded state, i.e., to reduce the area of the mesh member 20 that contacts the inner wall of the blood vessel B. As a result, damage to the inner wall of the blood vessel B can be suppressed.

In this embodiment, the resin film 30 formed on the middle portion 26 of the mesh member 20 is formed to match the shape of the middle portion 26 in the expanded state. Therefore, the middle portion 26 of the mesh member 20 has a high force that tries to maintain its shape when it is in the expanded state. As a result, the expanded state of the mesh member 20 is easily maintained. In other words, the stability of the posture in which the tip portion 22 and the first middle portion 26A of the mesh member 20 are pressed against the inner wall of the blood vessel B can be improved. As a result, the occurrence of failure to capture the foreign body M by the mesh member 20 can be suppressed.

In this embodiment, when the mesh member 20 is in an expanded state, the outer peripheral surface of the second intermediate portion 26B, which has a relatively gentle opening angle, of the intermediate portion 26 is brought into contact with the opening of the catheter shaft 50, thereby increasing the contact area between the mesh member 20 and the catheter shaft 50 and improving the adhesion between the mesh member 20 (resin film 30) and the catheter shaft 50. As a result, the gap between the mesh member 20 (resin film 30) and the catheter shaft 50 can be eliminated, and suction force can be applied to the foreign object M without waste.

B. Variations:
The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified in various forms without departing from the spirit of the invention. For example, the following modifications are also possible.

The configurations of the foreign body capture system 100 and the foreign body capture device 10 in the above embodiment are merely examples, and various modifications are possible. For example, in the above embodiment, the wire 12 is not limited to a solid body, but may be a hollow body. In this case, the base end side of the mesh member 20 may be open and communicate with the inside of the shaft. In addition, the mesh member 20 is not limited to a braided body, but may be, for example, a plate-shaped member punched into a mesh shape. In addition, the mesh member 20 is not limited to an approximately conical shape, but may be, for example, approximately cylindrical. In addition, the tip side portion 22, the base side portion 24, and the middle portion 26 are all not limited to an approximately conical shape, but may be, for example, approximately cylindrical. In addition, as the mesh member, for example, a stent manufactured by the following manufacturing method may be used. That is, this is a method of manufacturing a fine mesh pipe (stent) by cutting out a specially shaped mesh by fine laser processing from a metal pipe (for example, made of stainless steel or cobalt-chromium alloy).

In the above embodiment, the opening angle θ1 of the distal end portion 22 of the mesh member 20 may be greater than or less than the opening angle θ2 of the proximal end portion 24. The intermediate portion 26 of the mesh member 20 may have a shape in which the opening angle is substantially the same over its entire length.

In the above embodiment, the resin film 30 may also be formed on the tip portion 22 of the mesh member 20.

The materials of the components in the foreign object capture system 100 and foreign object capture device 10 of the above embodiment are merely examples and can be modified in various ways.

10: Foreign body capture device 12: Wire 20: Mesh member 21: First wire 22: Distal end portion 23: Second wire 24: Base end portion 26: Middle portion 26A: First middle portion 26B: Second middle portion 30: Resin film 40, 42, 54: X-ray opaque mark 50: Catheter shaft 52, 82: Lumen 54: X-ray opaque mark 60: Protective member 70: Guide wire 80: Guiding catheter 100: Foreign body capture system B: Blood vessel F: Air flow M: Foreign body O: Central axis

Claims (7)

1. A foreign body capture device, comprising:
A wire,
A cylindrical mesh member formed to be self-expandable in a radial direction, the base end of the mesh member being joined to the tip end of the wire;
a resin film formed on the mesh member from a first position located a first length away from the base end of the mesh member to a second position located toward the tip side of the first position, all around the mesh member , and blocking the stitches formed by the mesh member ;
A foreign object capture device comprising: 2. The foreign body capture device of claim 1,
A foreign body capture device, wherein the proximal end of the mesh member is closed. 3. The foreign body capturing device according to claim 1,
A foreign body capture device, wherein the second position is a position proximal to the tip of the mesh member. 4. The foreign body capture device according to claim 3,
A foreign body capture device, wherein, when the mesh member is expanded, the opening angle of the portion of the mesh member from the tip to the second position is smaller than the opening angle of the portion of the mesh member that is a second length from the second position to the base end side. 5. The foreign body capturing device according to claim 3 or 4,
A foreign body capture device, wherein, when the mesh member is expanded, the opening angle at the tip side of the portion of the mesh member on which the resin film is formed is larger than the opening angle at the base end side of the portion of the mesh member on which the resin film is formed. A hollow shaft;
A foreign object capturing system comprising the foreign object capturing device according to any one of claims 1 to 5,
A foreign body capture system, wherein the mesh member is capable of being accommodated within the shaft in a radially contracted state, and is configured to self-expand to a radially expanded state at a position distal to the shaft. 7. The foreign object capture system of claim 6,
A foreign body capture system, wherein the mesh member is configured such that, in an expanded state, the outer diameter at a third position between the first position and the second position is approximately equal to the inner diameter of the tip of the shaft.

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