JP7078376B2 - Recovery device - Google Patents

Description

The present invention relates to a device that collects wires in vivo.

There is a wire rendezvous method as a method of passing a guide wire through a highly obstructed lesion. In this method, when the guide wire pushed from the device insertion position into the blood vessel cannot pass through the obstructive lesion, the guide wire is inserted into the blood vessel from a different position on the opposite side of the obstructive lesion. The guidewire is then passed through the obstructed lesion and the distal end of the guidewire is inserted into the distal opening of the catheter inserted from the device insertion position. After this, the distal portion of the guide wire is led out of the blood vessel from the device insertion position via the catheter.

However, inserting the distal end of the guide wire into the distal opening of the opposing catheter requires a high degree of skill. In particular, when the blood vessel diameter is large, a higher technique is required.

As a device for collecting the guide wire, for example, a device for removing a foreign substance in a blood vessel can be used. For example, Patent Document 1 describes a device for removing a foreign substance in a blood vessel having a snare, which is a loop-shaped wire, at the distal end.

Japanese Unexamined Patent Publication No. 10-179600

When collecting the guide wire using the device described in Patent Document 1, it is necessary to put the guide wire in the loop. However, it is difficult to capture the guide wire because the guide wire easily slips through the gap between the blood vessel and the loop.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a recovery device capable of effectively recovering a wire in a living lumen.

In the recovery device according to the present invention, which achieves the above object, a wire inserted into the biological lumen is inserted into the biological lumen from a position different from the position where the wire is inserted into the biological lumen. A recovery device for catching and collecting wires, which is a deformable mesh formed by being connected to a long shaft portion and a distal portion of the shaft portion to form a tubular body . It has an expansion portion that can be contracted so as to reduce the outer diameter of the cylinder and can be expanded so as to increase the outer diameter of the cylinder . The expansion portion has a plurality of wires having different bending rigidity that are braided into a mesh shape, and the expansion portion having the expanded mesh shape can be inserted into the distal end of the wire. The expansion portion into which the distal end of the wire is inserted can capture the wire by contracting, and the shaft portion is pulled while the wire is captured by the expansion portion to pull the wire in vitro. It is possible to derive to.

In the recovery device configured as described above, by inserting the wire into the expanded mesh-shaped expansion portion and then contracting the expansion portion, the mesh-like expansion portion is entangled with the wire, and the wire can be captured with a high holding force. Therefore, the wire in the living lumen can be effectively recovered.

It is a top view which shows the recovery device. It is a top view which shows the state which combined the trapping instrument, the pressing shaft and the catheter of a recovery device. It is a top view which shows the expansion part of a catching instrument, (A) shows the state which the expansion part expanded, and (B) shows the state which the expansion part contracted. It is a flowchart for demonstrating the method of collecting a wire. It is sectional drawing which shows the state in the blood vessel, (A) shows the state when the dilated part was inserted into the blood vessel, (B) shows the state which dilated part in the blood vessel. It is sectional drawing which shows the state in the blood vessel, (A) shows the state which inserted the guide wire into the expansion part, (B) shows the state which contracted the expansion part and captured the guide wire. It is sectional drawing which shows the other use example of the recovery device. It is sectional drawing which shows the modification of the recovery device. It is sectional drawing which shows the other modification of the recovery device. It is sectional drawing which shows the further modification example of the recovery device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The dimensional ratios in the drawings may be exaggerated and differ from the actual ratios for convenience of explanation.

The recovery device 1 according to the embodiment of the present invention is a device for capturing the distal portion of the guide wire inserted into the blood vessel in the blood vessel. In the present specification, the side to be inserted into the blood vessel of the device is referred to as "distal side", and the hand side to be operated is referred to as "proximal side". Further, the axial direction means the long direction of the recovery device 1.

As shown in FIGS. 1 to 3, the recovery device 1 according to the embodiment of the present invention pushes out the capture device 10 that expands in the blood vessel, the catheter 30 that can store the capture device 10, and the capture device 10 from the catheter 30. It is provided with a pressing shaft 40.

As shown in FIG. 3, the capture device 10 includes an expansion portion 20 which is a mesh-shaped tubular body having a plurality of gaps 21A, and a long shaft portion 24 connected to the expansion portion 20.

The shaft portion 24 is a long wire extending from the hand to the expansion portion 20. The constituent material of the shaft portion 24 is not particularly limited, but for example, stainless steel, shape memory alloy, or the like can be preferably used.

The expansion portion 20 is a site for capturing the guide wire in the blood vessel. The expansion portion 20 includes a plurality of wire rods 21 braided in a mesh shape so as to form a tubular body, a distal side connecting portion 50 that bundles and connects the distal portions of the plurality of wire rods 21, and a plurality of wire rods 21. It is provided with a proximal side connecting portion 60 for bundling and connecting the proximal portions. The expansion portion 20 has a gap 21A between the plurality of braided wire rods 21. The expansion portion 20 can be flexibly deformed. The fact that the expansion portion 20 has a mesh shape means that a plurality of gaps 21A of the expansion portion 20 are arranged in the axial direction of the expansion portion 20 and a plurality of gaps 21A in the circumferential direction. The expansion portion 20 is not composed of the wire rod 21, but may be a laser-cut pipe such as a stent.

The distal connection portion 50 is formed in a cylindrical shape. The distal side connecting portion 50 includes a distal side through hole 51 (through hole) that penetrates in the axial direction. The proximal side connecting portion 60 is formed in a cylindrical shape, and the shaft portion 24 is connected. The proximal side connecting portion 60 includes a proximal side through hole 61 (through hole) penetrating in the axial direction. The distal through hole 51 and the proximal through hole 61 serve as a guide wire lumen into which a guide wire 90 (see FIG. 5) for guiding the recovery device 1 to a desired position is inserted. The constituent materials of the distal connecting portion 50 and the proximal connecting portion 60 are not particularly limited. For example, stainless steel can be preferably used.

The expansion portion 20 is in an expanded state (see FIG. 3A) in which the diameter is expanded by the elastic force (restoring force) of the wire rod 21 in a natural state in which an external force does not act. When the dilated portion 20 is in the expanded state, the proximal side connecting portion 60 and the distal side connecting portion 50 approach each other in the axial direction. A hollow internal space 29 is formed inside the expanded expansion portion 20. Further, when the dilated portion 20 is accommodated in the catheter 30 (see FIG. 2), the dilated portion 20 is elastically deformed to a contracted state in which the outer diameter becomes smaller (see FIG. 3 (B)). Inside the expanded portion 20 in the expanded state, an internal space 29 surrounded by the wire rod 21 is formed. When the dilated portion 20 is in the contracted state, the proximal side connecting portion 60 and the distal side connecting portion 50 are axially separated from each other. By changing the distance between the proximal side connecting portion 60 and the distal side connecting portion 50, the outer diameter of the expanding portion 20 can be changed.

The extension portion 20 is located between the proximal side taper portion 20A located on the proximal side, the distal side taper portion 20C located on the distal side, and the proximal side taper portion 20A and the distal side taper portion 20C. It has a central portion 20B and a central portion 20B. The proximal side tapered portion 20A has an inner / outer diameter that tapers toward the distal side from the proximal side connecting portion 60. The distal tapered portion 20C has an inner / outer diameter that tapers from the distal connecting portion 50 toward the proximal side. The central portion 20B has a substantially constant inner and outer diameter along the axial direction. The central portion 20B is a portion that comes into contact with the inner wall of the blood vessel when the dilated portion 20 is expanded. The portion that comes into contact with the inner wall of the blood vessel when the dilated portion 20 is dilated may be the proximal side tapered portion 20A or the distal side tapered portion 20C.

The number of wire rods 21 is not particularly limited, but is, for example, 4 to 72. Further, the conditions for braiding the wire rod 21 are not particularly limited. The wire diameter (outer diameter) of the wire 21 can be appropriately selected depending on the material of the wire 21, the inner diameter of the blood vessel to be applied, and the like, and is, for example, 20 to 300 μm. The expansion portion 20 is preferably composed of a plurality of types of wire rods 21 having different bending rigidity. The wire rods 21 having different flexural rigidity have, for example, different wire diameters (cross-sectional shapes) and at least one of the materials. As a result, the wire rod 21 having a low bending rigidity is more likely to bend than the wire rod 21 having a high bending rigidity. The expansion portion 20 may be composed of only a plurality of wire rods 21 having the same bending rigidity.

The constituent material of the wire 21 is preferably a flexible material, for example, a shape memory alloy, stainless steel, tantalum (Ta), titanium (Ti), white silver (for example) to which a shape memory effect and superelasticity are imparted by heat treatment. Pt), gold (Au), tungsten (W), polyethylene, polypropylene such as polypropylene, polyamide, polyester such as polyethylene terephthalate, fluoropolymer such as ETFE (tetrafluoroethylene / ethylene copolymer), PEEK (polyether ether) Ketone), polyimide, etc. can be preferably used. As the shape memory alloy, Ni—Ti based, Cu—Al—Ni based, Cu—Zn—Al based or a combination thereof or the like is preferably used. Examples of the structure in which a plurality of materials are combined include a structure in which a core wire made of Pt is coated with a Ni—Ti alloy in order to impart contrast, and a structure in which a core wire made of a Ni—Ti alloy is plated with gold. ..

The maximum outer diameter of the dilated portion 20 in the expanded state can be appropriately selected according to the inner diameter of the blood vessel to be applied. For example, it is 1 to 40 mm. The outer diameter of the dilated portion 20 in the contracted state can be appropriately selected according to the inner diameter of the blood vessel to be applied. For example, it is 0.3 to 4.0 mm. The axial length of the dilated portion 20 in the expanded state can be appropriately selected depending on the blood vessel to be applied. For example, it is 20 to 150 mm.

As shown in FIGS. 1 and 2, the catheter 30 includes a flexible and long catheter body 31, a hub 32, and a kink-resistant protector 33.

The catheter body 31 includes a containment lumen 34 capable of accommodating the capture device 10. The catheter body 31 has a tip 37 at the distal end that is more flexible than the proximal site. The tip 37 reduces damage to the living tissue that comes into contact with it. The tip 37 has a distal opening 36 at the distal end through which the containment lumen 34 opens.

The accommodation lumen 34 has a size capable of accommodating the expanded portion 20 in a contracted state. Further, the accommodation lumen 34 preferably has a size capable of accommodating the expansion portion 20 (see FIG. 6B) in a state where the guide wire 100 is captured, but the accommodation lumen 34 is not limited thereto. It is preferable that the inner diameter of the catheter body 31 (accommodating lumen 34) is smaller than the outer diameter of the distal connecting portion 50 with the outer diameter of the guide wire 100. As a result, when the guide wire 100 is captured by the expansion portion 20 and led out of the body, a part of the guide wire 100 is sandwiched between the inner peripheral surface of the catheter main body 31 and the outer peripheral surface of the distal side connecting portion 50. Therefore, a part of the guide wire 100 is fixed between the catheter main body 31 and the distal side connecting portion 30, and the guide wire 100 is hard to come off.

The hub 32 is fixed to the proximal end of the catheter body 31. The hub 32 includes a hub opening 35 that communicates with the accommodation lumen 34. The kink-resistant protector 33 is a flexible member that covers the connecting portion of the catheter body 31 and the hub 32. The kink-resistant protector 33 suppresses the kink of the catheter body 31.

The pressing shaft 40 is a tube body that can be accommodated in the accommodation lumen 34 of the catheter 30. The pressing shaft 40 has an extrusion lumen 41 into which the shaft portion 24 of the capturing device 10 can be inserted. The inner diameter of the extrusion lumen 41 is smaller than the outer diameter of the proximal side connecting portion 60 of the capture device 10. Therefore, the proximal side connecting portion 60 cannot enter the extrusion lumen 41. Therefore, the distal end surface of the pressing shaft 40 can press the proximal connecting portion 60 to the distal side.

Next, a wire recovery method using the recovery device 1 according to the present embodiment will be described with reference to the flowchart shown in FIG.

The recovery device 1 narrows the guide wire 100 for guiding the device for treatment to the stenosis S in order to treat (treat) the stenosis S (see FIG. 5 (A)) such as a thrombus. It is used to penetrate the portion S. The device for treatment is not particularly limited, and is, for example, an atherectomy device, a balloon catheter, a filter device, or the like. When the guide wire 100 cannot be inserted through the stenosis S from the device insertion position where the treatment device is percutaneously inserted into the blood vessel, the guide wire 100 is inserted on the opposite side of the device insertion position across the stenosis S. Insert from the wire insertion position of. As an example, it can be assumed that the device insertion position is the femoral vein, the stenosis portion S is the iliac vein, and the wire insertion position opposite the device insertion position is the jugular vein. By inserting the guide wire 100 from the wire insertion position opposite to the device insertion position, the guide wire 100 may be able to pass through the narrowed portion S as shown in FIG. 5 (A) (step S10). In this case, in order to guide the treatment device to the stenosis portion S by using the guide wire 100, it is necessary to lead the distal end of the guide wire 100 out of the living body from the device insertion position. The recovery device 1 is used to capture the distal end of the guide wire 100 and guide it out of the body from the device insertion position.

After the distal portion of the guide wire 100 penetrates the narrowed portion S, another guide wire 90 is inserted from the device insertion position. The other guide wire 90 is a wire for guiding the recovery device 1, and is different from the guide wire 100 to be captured. Next, the guide wire 90 is pushed forward to reach the proximal side of the narrowed portion S.

Next, a recovery device 1 (see FIG. 2) in which the capture device 10 and the pressing shaft 40 are housed in the catheter 30 is prepared. The dilation portion 20 is arranged at a position close to the distal end portion of the catheter body 31, and its shape is constrained in a contracted state. The shaft portion 24 projects proximally from the hub opening 35 of the hub 32.

Next, the proximal end of the guide wire 90 located outside the body is inserted into the distal through hole 51 and the proximal through hole 61 (see FIG. 3) of the recovery device 1. Subsequently, the recovery device 1 is brought to the proximal side of the constriction portion S along the guide wire 90 (step S11).

Next, the catheter 30 is moved to the proximal side while suppressing the movement of the pressing shaft 40 by hand. At this time, the distal end of the pressing shaft 40 comes into contact with the proximal side connecting portion 60. As a result, the movement of the dilated portion 20 is suppressed, so that the position of the dilated portion 20 in the blood vessel can be arbitrarily adjusted. Then, as the catheter 30 moves proximally to the pressing shaft 40, the dilated portion 20 is released from the catheter body 31. The pressing shaft 40 may not be used. In this case, the capture device 10 can be manually inserted through the hub opening 35 of the catheter 30. In addition, the capture device 10 can be pushed by hand to release the dilation portion 20 from the distal opening 36 of the catheter body 31.

When the dilated portion 20 is released from the catheter body 31, the distal connecting portion 50 moves closer to the proximal connecting portion 60, as shown in FIG. 5 (B). Then, the expansion portion 20 expands to an optimum size by its own restoring force and comes into contact with the inner wall surface of the blood vessel (step S12). Since the expansion portion 20 is formed in a mesh shape, it bites into the inner wall surface of the blood vessel and is firmly fixed. The maximum expandable diameter of the dilator 20 used is greater than the diameter of the vessel to be inserted. Therefore, the dilated portion 20 is in a state of not completely expanding in the blood vessel, and generates an dilating force to be effectively fixed to the blood vessel wall. The inner diameter of the blood vessel in which the expansion portion 20 is placed is expanded by the expansion portion 20. After that, the pressing shaft 40 is removed from the living body, leaving the capture device 10 and the catheter 30.

Next, the guide wire 100 penetrating the narrowed portion S is pushed toward the device insertion position. As a result, as shown in FIG. 6A, the distal end of the guide wire 100 is inserted into the expansion portion 20 (step S13). The distal end of the guide wire 100 passes through any gap 21A of the extension 20 and reaches the internal space 29. The distal end of the guide wire 100 preferably stays in the internal space 29 of the extension 20. The distal end of the guide wire 100 may reach the internal space 29 of the expansion portion 20 and then project out of the expansion portion 20 through another gap 21A.

Next, the catheter 30 is moved distally along the shaft portion 24. As a result, as shown in FIG. 6B, the wire rod 21 of the expansion portion 20 is gradually accommodated inside the accommodation lumen 34. As a result, the extension portion 20 is gradually reduced in diameter from the proximal side while the distal side connecting portion 50 is separated from the proximal side connecting portion 60, and is accommodated in the accommodation lumen 34. When the expansion portion 20 contracts, the gap 21A of the expansion portion 20 is gradually deformed and closed, and the guide wire 100 is captured by the expansion portion 20 (step S14). The accommodation lumen 34 preferably can completely accommodate the expansion portion 20 in a state where the guide wire 100 is captured, but may not be able to completely accommodate the expansion portion 20. If the extension 20 cannot be completely accommodated, a portion of the proximal portion of the extension 20 is accommodated in the accommodation lumen 34. As a result, the expansion portion 20 contracts, and the state in which the guide wire 100 is captured by the expansion portion 20 can be maintained.

After accommodating the dilation portion 20 together with the distal portion of the captured guide wire 100 inside the catheter 30, the capture device 10 is removed from the device insertion position together with the catheter 30. As a result, the distal portion of the guide wire 100 is led out of the living body from the device insertion position (step S15). Next, the extension 20 is pushed distally from the accommodation lumen 34. As a result, the expansion portion 20 expands, and the distal portion of the guide wire 100 captured by the expansion portion 20 can be pulled out from the expansion portion 20 (step S16). As a result, the recovery of the guide wire 100 by the recovery device 1 is completed. After that, the treatment device is inserted into the blood vessel from the device insertion position along the guide wire 100 led out from the device insertion position. Thereby, the treatment device can be guided to the stenosis portion S along the guide wire 100, and the treatment by the treatment device can be performed.

As described above, the recovery device 1 according to the present embodiment is a device for recovering the guide wire 100 in the living lumen, and is connected to the long shaft portion 24 and the distal portion of the shaft portion 24. It has a deformable mesh-shaped expansion portion 20 and a catheter 30 capable of accommodating the shaft portion 24 and the expansion portion 20.

The recovery device 1 configured as described above can release the dilated portion 20 from the catheter 30 inserted into the biological lumen, expand the dilated portion 20, and place it on the inner wall surface of the biological lumen. Since the dilated portion 20 placed in the biological lumen has a mesh shape, the guide wire 100 in the biological lumen can be easily inserted into the dilated portion 20. Since the expansion portion 20 has a mesh shape, it can be entangled with the guide wire 100 by being accommodated in the catheter 30 and reduced in diameter, and the guide wire 100 can be captured with a high holding force. The guide wire 100 captured by the expansion unit 20 can be easily led out of the living body together with the expansion unit 20. Therefore, the recovery device 1 can effectively capture and recover the guide wire 100 in the living lumen. In particular, the recovery device 1 is effective for capturing the guide wire 100 in a wide living lumen such as various arteries and veins. Further, since the expansion portion 20 is in close contact with the inner wall surface of the biological lumen, there is no gap between the inner wall surface of the biological lumen and the expansion portion 20. Therefore, the guide wire 100 can be easily and surely inserted into the expansion portion 20. Further, since the expansion portion 20 is elastically deformable, the inner diameter of the living lumen can be expanded by expanding the expansion portion 20. Therefore, the shape of the living lumen is corrected, and the guide wire 100 in the living lumen can be easily inserted into the expansion portion 20. Further, since the expansion portion 20 is a tubular body, it is easy to adhere to the inner wall surface of the biological lumen without a gap.

Further, the expansion portion 20 has a plurality of braided wire rods 21. As a result, the expansion portion 20 can have a plurality of gaps 21A for inserting the guide wire 100. Further, the expanded portion 20 can be easily deformed between the expanded state and the contracted state by changing the axial length of the expanded portion 20.

Further, the expansion portion 20 may have a plurality of wire rods 21 having different bending rigidity. As a result, when the expansion portion 20 into which the distal portion of the guide wire 100 is inserted is contracted, the wire rod 21 having a low bending rigidity is flexed more flexibly by the guide wire 100 than the wire rod 21 having a high bending rigidity. As a result, the expansion portion 20 is in close contact with the guide wire 100, and the guide wire 100 can be captured and collected with a high holding force.

Further, a distal through hole 51 and a proximal through hole 61 penetrating in the axial direction are formed in the distal portion and the proximal portion of the expansion portion 20. Therefore, the guide wire 90 for guiding the recovery device 1 to a target position can be inserted into the distal through hole 51 and the proximal through hole 61. Since the extension portion 20 is provided with the distal through hole 51 and the proximal through hole 61, the guide wire 90 can be inserted even in the contracted state housed in the catheter 30.

The present invention also has a recovery method for recovering the guide wire 100 in the living lumen. In the recovery method, a step S11 in which a deformable mesh-shaped expansion portion 20 connected to the distal portion of the long shaft portion 24 is contracted and inserted into the living lumen, and the expansion portion 20 are expanded. The inside of the mesh-shaped expansion portion 20 is the step S12 in which the extension portion 20 is brought into close contact with the inner wall surface of the living body lumen and the distal end of the guide wire 100 inserted from a position different from the position where the expansion portion 20 is inserted into the living body lumen. It has a step S13 to be inserted into, a step S14 to contract the expansion portion 20 to capture the guide wire 100 by the expansion portion 20, and a step S15 to pull the shaft portion 24 to lead the guide wire 100 out of the living body.

In the recovery method configured as described above, the distal end of the guide wire 100 inserted from a position different from the position where the expansion portion 20 is inserted into the living lumen is inserted into the inside of the mesh-shaped expansion portion 20. The expansion portion 20 is entangled with the guide wire 100, and the guide wire 100 can be captured with a high holding force. Then, the distal portion of the guide wire 100 recovered by the expansion portion 20 can be easily led out of the living body together with the expansion portion 20. Therefore, this recovery method can effectively capture and recover the guide wire 100 in the living lumen. In particular, the recovery method is effective for capturing the guide wire 100 in a wide living lumen such as various arteries and veins. Further, since the expansion portion 20 is in close contact with the inner wall surface of the biological lumen, there is no gap between the inner wall surface of the biological lumen and the expansion portion 20. Therefore, the guide wire 100 can be easily and surely inserted into the expansion portion 20. Further, since the expansion portion 20 is elastically deformable, the inner diameter of the living lumen can be expanded by expanding the expansion portion 20. Therefore, it becomes easy to insert the guide wire 100 in the living lumen into the expansion portion 20.

The present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art within the technical idea of the present invention. For example, the living lumen into which the recovery device 1 is inserted is not limited to a blood vessel, and may be, for example, a vessel, a ureter, a bile duct, an oviduct, a hepatic duct, or the like. Further, in the above-described embodiment, an example aimed at passing a catheter in a thrombus stenosis is shown, but the purpose of use is not limited to this. For example, it may be used for the purpose of passing a catheter through a stenosis that is not derived from a thrombus, or passing through a catheter at a vascular flexion site or a site where the branch angle of a blood vessel is large.

Further, the guide wire 100 does not have to be inserted from the distal side with respect to the expansion portion 20 of the recovery device 1. For example, as in the other use cases shown in FIG. 7, the guide wire 100 may be inserted from the side surface side or the proximal side with respect to the extension portion 20.

Further, the distal portion of the dilated portion 20 has a ring-shaped folded portion 25 that is folded in the axial direction and protrudes to the distal side at a position on the outer side in the radial direction, as in the modified example shown in FIG. May be good. The expansion portion 20 is pre-shaped so that the folded portion 25 is formed in a natural state. The shaping can be performed, for example, by holding the shape in a predetermined shape, accommodating it in a mold, and heating it. The distal portion of the dilated portion 20 has a concave shape that opens to the distal side. Therefore, the expansion portion 20 can surely guide the guide wire 100 inserted from the distal side to the internal space 29 due to the concave shape. Further, the distal end of the guide wire 100 may be located not in the internal space 29 but in the recess 26 which is the inside of the concave shape on the distal side of the expansion portion 20. In this case, when the dilated portion 20 is accommodated in the catheter 30, the distal connecting portion 50 moves to the distal side to eliminate the folded state of the dilated portion 20, and the dilated portion 20 extends in the axial direction. Reduce the diameter. As a result, the distal end of the guide wire 100 located in the recess 26 can automatically pass through the gap 21A of the wire 21 and reach the internal space 29. The folded-back portion may be formed in the proximal portion of the expansion portion 20 so as to project toward the proximal side.

Further, the recovery device 1 may have a film body 70 that covers a part of the gap 21A of the expansion portion 20, as in the other modification shown in FIG. The film body 70 is flexible and can be deformed following the expansion portion 20. The constituent material of the film body 70 is preferably a flexible material, and for example, urethane, natural rubber, silicone resin, or the like can be preferably used. The membrane body 70 may be a member having breathability and liquid permeability. As an example, the membrane body 70 is fixed to the expansion portion 20 by dipping. The film body 70 may be provided on the outer peripheral surface side of the expansion portion 20. Further, the film body 70 may be provided between the inner peripheral surface and the outer peripheral surface of the expansion portion 20, that is, in the space of the gap 21A. The membrane body 70 closes, for example, the gap 21A located in the proximal side tapered portion 20A of the expansion portion 20. The membrane body 70 prevents the distal end of the guide wire 100 inserted into the internal space 29 of the expansion portion 20 from passing through the internal space 29 and projecting out of the expansion portion 20. Therefore, the recovery device 1 provided with the membrane body 70 can easily maintain the distal end of the guide wire 100 in the internal space 29. Therefore, the guide wire 100 can be satisfactorily captured by the expansion portion 20. The position where the membrane body 70 is provided is not limited to the proximal taper portion 20A of the expansion portion 20, and is, for example, the distal taper portion 20C or the central portion 20B of the expansion portion 20 (see FIG. 3). You may.

Further, the shaft portion 24 may be connected to the distal side connecting portion 50 instead of the proximal side connecting portion 60 as in still another modification shown in FIG. The shaft portion 24 is slidable in the axial direction with respect to the proximal side connecting portion 60. The fact that the proximal side connecting portion 60 and the distal side connecting portion 50 are connected to the shaft portion 24 is not limited to being fixed to the shaft portion 24, and relatively rotates or moves. It also includes being concatenated as possible. When the shaft portion 24 is connected to the distal side connecting portion 50, the dilated portion 20 is placed in the blood vessel, and then the shaft portion 24 is pulled toward the proximal side so as to the distal portion of the dilated portion 20 in the axial direction. It is possible to form a ring-shaped folded portion 25 that is folded back and protrudes to the distal side.

Further, in the expansion portion 20, the friction coefficient on the inner peripheral surface side of the wire rod 21, that is, the side of the wire rod 21 facing the internal space 90 may be higher than the friction coefficient on the outer peripheral surface side. The coefficient of friction can be easily adjusted by partially coating other members or changing the surface roughness. As a result, the guide wire 100 captured by the expansion portion 20 can be firmly held by the high frictional force. Further, since the friction coefficient on the outer peripheral surface side of the expansion portion 20 is lower than the friction coefficient on the inner peripheral surface side, it is easy to push the expansion portion 20 out of the catheter 30 and accommodate it in the catheter 30.

1 Recovery device,
10 Capture device,
20 expansion part,
21 wire rod,
21A gap,
24 shaft part,
25 Folded part,
29 internal space,
30 catheter,
34 Containment lumen,
50 Distal connection,
51 Distal through hole (through hole),
60 Proximal side connection,
61 Proximal side through hole (through hole),
70 membrane body,
100 guide wires.

Claims (6)

It is a recovery device for inserting a wire inserted into a biological lumen into the biological lumen from a position different from the position where the wire is inserted into the biological lumen to capture and recover the wire. hand,
With a long shaft part,
It is connected to the distal portion of the shaft portion, is formed to form a tubular body, and has a deformable mesh shape, and can be contracted so as to reduce the outer diameter of the tubular body . , With an expansion portion that can be expanded so as to increase the outer diameter of the cylinder .
The expansion portion has a plurality of wires having different bending rigidity, which are braided into a mesh shape.
The expanded mesh-like extension allows the distal end of the wire to be inserted inward.
The expansion portion into which the distal end of the wire is inserted can catch the wire by contracting.
A recovery device capable of pulling the shaft portion in a state where the wire is captured by the expansion portion to lead the wire out of the living body. The recovery device according to claim 1, wherein the expanded portion can be folded back along the axial direction, and the radially outer folded portion of the expanded portion can be projected to the proximal side or the distal side. The recovery device according to claim 1 or 2, wherein the recovery device has a catheter capable of accommodating the expansion portion that contracts and captures the wire. The recovery device according to any one of claims 1 to 3 , wherein the dilated portion has through holes formed in the distal portion and the proximal portion in the axial direction. The recovery device according to any one of claims 1 to 4 , which has a membrane body covering a part of the gap of the expansion portion in the form of a mesh. Claim 1 in which the friction coefficient on the inner peripheral surface side, which is the side facing the internal space surrounded by the expansion portion, is higher than the friction coefficient on the outer peripheral surface side, which is the opposite side of the inner peripheral surface side. The recovery device according to any one of 5 to 5 .

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