JP2023072217A - medical device - Google Patents

Abstract

To provide a medical device which supports a guide wire to be able to satisfactorily pass through a lesioned part, by inhibiting buckling of the guide wire.SOLUTION: A medical device 1 comprises: a shaft 10 which has a guide wire lumen and extends in an axial direction; a first division piece 21 and a second division piece 22 which are provided on the inner peripheral side of the tip of the shaft and provided opposite to each other so as to be able to approach and separate from each other on an axis orthogonal cross section, and insert and hold a first guide wire G1 therebetween while approaching; and a first moving part 30 which moves the first division piece and the second division piece inward in a radial direction.SELECTED DRAWING: Figure 14

Description

The present invention relates to medical devices.

When performing various treatments in a body lumen such as a blood vessel, an operator delivers a guiding catheter to a location close to a lesion along a guide wire previously inserted into the blood vessel. After guiding the tip of the guiding catheter to a location near the lesion, the operator advances a therapeutic device such as a balloon catheter from the tip of the guiding catheter to treat the lesion (for example, a stenosis formed in a blood vessel). part).

Prior to treating the narrowed area with a therapeutic device such as a balloon catheter, it is necessary to pass a guide wire through the narrowed area. However, since the guide wire is generally formed to be flexible, it is difficult to pass through an obstructive lesion or a calcified lesion (hereinafter referred to as a lesion).

In this regard, for example, Patent Literature 1 below discloses a guidewire support catheter (corresponding to a medical device) capable of improving rigidity.

JP 2018-11953 A

However, in the case of the above-described guidewire support catheter, since there is a gap between the inner tubular member and the guidewire, the guidewire may buckle and the guidewire may not be able to be properly passed through the lesion.

An object of the present invention is to solve the above problems, and to provide a medical device that suppresses buckling of the guidewire and supports the guidewire so that the guidewire can pass through lesions appropriately. aim.

The medical device includes a guidewire lumen, is provided on the inner peripheral side of a shaft portion extending in the axial direction, and on the distal end portion of the shaft portion, and is arranged so as to be able to approach and separate from each other in a cross section perpendicular to the axis. A first split piece and a second split piece provided facing each other and sandwiching the first guide wire in an adjacent state, and moving the first split piece and the second split piece radially inward to bring them close to each other. and a first moving part.

According to the medical device of the present invention, the first moving part can move the first split piece and the second split piece radially inward to bring them close to each other, thereby sandwiching the first guide wire. Therefore, it is possible to suppress buckling of the first guide wire and support the first guide wire so that the first guide wire can preferably pass through the lesion.

1 is an overall view showing a medical device according to an embodiment of the invention; FIG. FIG. 4 is a schematic cross-sectional view showing the vicinity of the distal end portion of the medical device according to the present embodiment, showing an initial state in which the first split piece, the second split piece, the third split piece, and the fourth split piece are separated from each other; It is a diagram. 3 is a cross-sectional view taken along line 3-3 of FIG. 2; FIG. FIG. 4 is a schematic cross-sectional view showing the vicinity of the distal end portion of the medical device according to the present embodiment, showing a state in which the first split piece and the second split piece are close to each other. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 4; FIG. 4B is a schematic view showing the vicinity of the distal end portion of the medical device according to the present embodiment, showing a state in which the third split piece and the fourth split piece are close to each other. FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 6; FIG. 4 is a diagram for explaining the configuration of the switching valve, and is a diagram showing a state in which the first lumens positioned before and after the switching valve communicate with each other through the first communication lumen. FIG. 4 is a diagram for explaining the configuration of the switching valve, and is a diagram showing a state in which the first and third lumens positioned before and after the switching valve are communicated by the second flow lumen. FIG. 4 is a schematic cross-sectional view showing the vicinity of the distal end portion of a support catheter according to a comparative example; FIG. 3 is a schematic cross-sectional view showing the vicinity of the distal end portion of the medical device according to the present embodiment; FIG. 4 is a schematic cross-sectional view showing how to use the medical device according to the present embodiment, showing how the first guidewire is inserted into the coronary artery. FIG. 4B is a schematic cross-sectional view showing a method of using the medical device according to the present embodiment, showing a state in which the medical device is inserted to the vicinity of a lesion via a first guidewire. FIG. 4B is a schematic cross-sectional view showing a method of using the medical device according to the present embodiment, and showing a state in which the medical device supports the first guidewire to be gripped. FIG. 4B is a schematic cross-sectional view showing a method of using the medical device according to the present embodiment, and showing a state in which the first guidewire supported by the medical device is moved to the distal side. 16 is a cross-sectional view taken along line 16-16 of FIG. 15; FIG. FIG. 4 is a diagram showing a state in which the medical device according to the present embodiment supports the second guide wire so as to be grasped; FIG. 10 is a diagram showing a state in which the medical device according to the present embodiment supports the third guide wire so as to be gripped;

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may differ from the actual ratios.

FIG. 1 is an overall view showing a medical device 1 according to an embodiment of the invention. FIG. 2 is a schematic cross-sectional view showing the vicinity of the distal end portion 1A of the medical device 1 according to this embodiment. 24 is a diagram showing an initial state in which 24 are spaced apart from each other; FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2. FIG. FIG. 4 is a schematic cross-sectional view showing the vicinity of the distal end portion 1A of the medical device 1 according to this embodiment, showing a state in which the first split piece 21 and the second split piece 22 are close to each other. 5 is a cross-sectional view taken along line 5-5 of FIG. 4. FIG. FIG. 6 is a schematic diagram showing the vicinity of the distal end portion 1A of the medical device 1 according to this embodiment, showing a state in which the third split piece 23 and the fourth split piece 24 are close to each other. 7 is a cross-sectional view taken along line 7-7 of FIG. 6. FIG. 8 and 9 are diagrams for explaining the configuration of the switching valve 70. FIG.

In this specification, the direction in which the straight shaft portion 10 extends is defined as the axial direction. In the axial direction, the side inserted into the biological lumen (left side in FIG. 2) is defined as the "distal side", and the proximal side (right side in FIG. 2) is defined as the "proximal side". In each component of the medical device 1, a portion including a certain range in the axial direction from the tip (most tip) is defined as a "tip".

A medical device 1 according to this embodiment functions as a support catheter that supports a first guide wire G1, a second guide wire G2, and a third guide wire G3 (see FIGS. 14 to 18). The configuration of the medical device 1 will be described below.

As shown in FIGS. 1 to 9, the medical device 1 includes a shaft portion 10 extending in the axial direction, and a first split piece 21 and a second split piece provided on the inner peripheral side of the distal end portion of the shaft portion 10. 22, a third split piece 23 and a fourth split piece 24 provided on the inner peripheral side of the tip portion of the shaft portion 10, a first moving portion 30 for moving the first split piece 21 and the second split piece 22, A second moving part 40 for moving the third split piece 23 and the fourth split piece 24; a supply part 50 for supplying fluid to the first moving part 30 or the second moving part 40; and a switching valve 70 for switching movement of the first segment 21 and the second segment 22 or movement of the third segment 23 and the fourth segment 24 .

The shaft portion 10 extends axially. As shown in FIGS. 2, 4, 6, 8 and 9, the shaft portion 10 has a first lumen 11 and a first lumen 11 through which a fluid injected into a first moving portion 30 that moves the first split piece 21 moves. , the second lumen 12 where the fluid injected into the first moving part 30 that moves the second split piece 22 moves, and the second lumen 12 where the fluid injected into the second moving part 40 that moves the third split piece 23 moves. It has three lumens 13 , a fourth lumen 14 through which the fluid injected into the second moving part 40 that moves the fourth split piece 24 moves, and a guidewire lumen 15 . 6 and 9, the fourth lumen 14 and the fourth split piece 24 are arranged on the back side of the paper.

The first lumen 11 and the second lumen 12 are in communication with the first moving part 30, and the fluid flows into the first moving part 30 via the first lumen 11 and the second lumen 12, thereby causing the first division. The piece 21 and the second split piece 22 are moved radially inward (see FIGS. 4 and 5).

The third lumen 13 and the fourth lumen 14 are in communication with the second moving part 40, and the fluid flows into the second moving part 40 via the third lumen 13 and the fourth lumen 14, thereby causing the third division. The piece 23 and the fourth split piece 24 are moved radially inward (see FIGS. 6 and 7).

The outer diameter of the shaft portion 10 is not particularly limited, but is 1.4 to 3.0 mm. The inner diameter of the shaft portion 10 is not particularly limited, but is 1.3 to 2.9 mm.

The material constituting the shaft portion 10 is not particularly limited, but examples include polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), fluorine-based resins such as perfluoroalkoxy fluorine resin (PFA), polyethylene, Examples include olefinic resins such as polypropylene, mixtures thereof, polyurethane, polyester, polyamide, polyether nylon resins, and mixtures of olefinic resins and ethylene/vinyl acetate copolymers.

The first split piece 21 and the second split piece 22 are provided on the inner peripheral side of the distal end portion of the shaft portion 10 . As shown in FIGS. 2 to 5, the first split piece 21 and the second split piece 22 are provided so as to face each other so as to be close to each other and separated from each other in the cross section perpendicular to the axis.

The first split piece 21 and the second split piece 22 can sandwich the first guide wire G1 (eg, 0.014 inch outer diameter) in a state of being close to each other.

The first split piece 21 and the second split piece 22 are semicircular members having the same radius of curvature as the radius of the first guide wire G1. For example, when the outer diameter of the first guide wire G1 is 0.014 inch, the radius of curvature of the first segment 21 and the second segment 22 is 0.007 inch which is 0.014 inch/2. Considering the case where the first guide wire G1 deviates from the longitudinal central axis of the guide wire lumen, the radius of curvature may be larger than the radius of the first guide wire G1.

The first split piece 21 and the second split piece 22 are fixed to the first moving part 30 . A method of fixing the first split piece 21 and the second split piece 22 to the first moving part 30 is not particularly limited, but may be, for example, adhesion using an adhesive.

The material forming the first split piece 21 and the second split piece 22 is not particularly limited, but a plastic material having a rigidity that can maintain its shape can be used.

The third split piece 23 and the fourth split piece 24 are provided on the inner peripheral side of the distal end portion of the shaft portion 10 . As shown in FIGS. 2, 3, 6, and 7, the third split piece 23 and the fourth split piece 24 are provided so as to face each other so as to be close to each other and separated from each other in the cross section perpendicular to the axis.

The third split piece 23 and the fourth split piece 24 can sandwich a second guide wire G2 (for example, an outer diameter of 0.018 inches) that is different from the first guide wire G1, that is, has a larger outer diameter than the first guide wire G1. can.

The third split piece 23 and the fourth split piece 24 are semicircular members having the same radius of curvature as the radius of the second guide wire G2. For example, when the outer diameter of the second guide wire G2 is 0.018 inch, the radius of curvature of the third segment 23 and the fourth segment 24 is 0.009 inch which is 0.018 inch/2. The radius of curvature of the semicircular members of the third segment 23 and the fourth segment 24 is larger than the radius of curvature of the semicircular members of the first segment 21 and the second segment 22 . Considering the case where the second guide wire G2 deviates from the longitudinal central axis of the guide wire lumen, the radius of curvature may be larger than the radius of the second guide wire G2.

The third split piece 23 and the fourth split piece 24 are fixed to the second moving part 40 . A method of fixing the third split piece 23 and the fourth split piece 24 to the second moving portion 40 is not particularly limited, but is, for example, adhesion using an adhesive.

The material forming the third split piece 23 and the fourth split piece 24 is not particularly limited, but the same material as the first split piece 21 and the second split piece 22 can be used.

As shown in FIG. 3, when the first split piece 21, the second split piece 22, the third split piece 23, and the fourth split piece 24 are separated from each other in the initial state, the first split piece 21 and the second split piece 21 are separated from each other. Segment 22, third segment 23, and fourth segment 24 can pass through a third guide wire G3 (e.g., 0.035 inches) with a different outer diameter than first guide wire G1 and second guide wire G2. is configured to That is, the diameter of an imaginary circle (two-dot chain line in FIG. 3) passing through both ends of the first split piece 21, the second split piece 22, the third split piece 23, and the fourth split piece 24 is the diameter of the third guide wire G3. is approximately the same as the diameter of

As shown in FIGS. 4 and 5, the first moving part 30 moves the first split piece 21 and the second split piece 22 radially inward to bring them closer to each other. A pair of first moving parts 30 are provided in the cross section perpendicular to the axis. By bringing the first split piece 21 and the second split piece 22 close to each other by the first moving part 30, the first split piece 21 and the second split piece 22 sandwich and support the first guide wire G1 (see FIG. 16). ).

The first moving part 30 is a balloon that can be expanded by inflow of fluid (working fluid). The first moving part 30 is expanded by injecting working fluid through the first lumen 11 and the second lumen 12 . By expanding the first moving part 30, the first split piece 21 and the second split piece 22 approach each other. The working fluid can be, for example, a mixture of contrast medium and saline.

The first moving part 30 is fixed to the inner peripheral surface of the shaft part 10 . A method of fixing the first moving part 30 to the shaft part 10 is not particularly limited, but is, for example, bonding with an adhesive.

Examples of the constituent material of the first moving part 30, which is a balloon, include polyethylene, polypropylene, polyolefins such as ethylene-propylene copolymers, polyesters such as polyethylene terephthalate, polyvinyl chloride, ethylene-vinyl acetate copolymers, and crosslinked ethylene. - Thermoplastic resins such as vinyl acetate copolymers and polyurethanes, polyamides, polyamide elastomers, polystyrene elastomers, silicone rubbers, latex rubbers and the like can be used.

As shown in FIGS. 6 and 7, the second moving part 40 moves the third split piece 23 and the fourth split piece 24 radially inward to bring them closer to each other. A pair of second moving parts 40 are provided in the cross section perpendicular to the axis. By bringing the third split piece 23 and the fourth split piece 24 close to each other by the second moving part 40, the third split piece 23 and the fourth split piece 24 sandwich and support the second guide wire G2 (see FIG. 17). ).

The second moving part 40 is a balloon that can be expanded by inflow of fluid (working fluid). The second moving part 40 is expanded by injecting the working fluid through the third lumen 13 and the fourth lumen 14 . The expansion of the second moving part 40 causes the third split piece 23 and the fourth split piece 24 to approach each other.

The second moving portion 40 is fixed to the inner peripheral surface of the shaft portion 10 . A method of fixing the second moving portion 40 to the shaft portion 10 is not particularly limited, but is, for example, bonding with an adhesive.

As a constituent material of the second moving portion 40, which is a balloon, the same material as that of the first moving portion 30, which is a balloon, can be used.

The supply unit 50 supplies fluid to the first moving unit 30 or the second moving unit 40 . By supplying the fluid to the first moving part 30 from the supply part 50, the balloon of the first moving part 30 is expanded to bring the first segment 21 and the second segment 22 closer to each other. Further, the supply unit 50 supplies the fluid to the second moving unit 40, so that the balloon of the second moving unit 40 expands, bringing the third split piece 23 and the fourth split piece 24 closer to each other.

The supply part 50 is connected to the second opening 62 of the hub 60 in a liquid-tight and air-tight manner, as shown in FIG. A known indeflator or the like can be used for the supply unit 50 .

Hub 60 has a first opening 61 forming a guidewire port and a second opening 62 forming an injection port, as shown in FIG.

Examples of the material of the hub 60 include thermoplastic resins such as polycarbonate, polyamide, polysarsan, polyarylate, and methacrylate-butylene-styrene copolymer.

The switching valve 70 can switch the inflow of the fluid to the first moving part 30 or the second moving part 40 . Thereby, the radially inward movement of the first divided piece 21 and the second divided piece 22 or the radially inward movement of the third divided piece 23 and the fourth divided piece 24 can be switched.

The switching valve 70 is provided on the shaft portion 10 close to the hub 60 as shown in FIG. 2 and the like. The switching valve 70, as shown in FIG. and a second flow lumen 73 .

The fluid supplied from the supply unit 50 moves through the first lumen 11 and the second lumen 12 from the proximal side toward the switching valve 70 . As shown in FIGS. 2, 4, and 8, when the first flow lumen 72 connects the first lumens 11 and the second lumens 12 in front and behind the switching valve 70 in the axial direction, the first lumen 11 and the second lumen 12 from the proximal side toward the switching valve 70 flows through the first lumen 11 and the second lumen 12 via the first communication lumen 72 and flows into the first moving part 30. Then, the first split piece 21 and the second split piece 22 are brought close to each other. As a result, the medical device 1 can grasp and support the first guide wire G1.

On the other hand, as shown in FIGS. 6 and 9, a second flow lumen 73 connects the first lumen 11 and the third lumen 13, and the second lumen 12 and the fourth lumen 14 in front and behind the switching valve 70 in the axial direction. The fluid that has moved through the first lumen 11 and the second lumen 12 toward the switching valve 70 from the proximal end side flows through the third lumen 13 and the fourth lumen 14 via the second communication lumen 73. and flows into the second moving portion 40 to bring the third split piece 23 and the fourth split piece 24 close to each other. As a result, the medical device 1 can grasp and support the second guide wire G2.

Next, referring to FIGS. 12 to 18, the case of treating an occlusive lesion or a calcified lesion (referred to as a lesion portion N) in a blood vessel B (for example, a coronary artery) is taken as an example. A method of using the device 1 will be described. Also, a case where the first guide wire G1 is used as the guide wire will be described.

First, the operator inserts the distal end of a guiding catheter (not shown) from a predetermined position in the living body and reaches the coronary artery through the femoral artery.

Next, as shown in FIG. 12, the operator inserts the first guide wire G1 into the blood vessel B through the guiding catheter to reach the lesion N. As shown in FIG. Here, since the guide wire is generally made flexible, it is difficult to pass through the obstructed lesion N.

Next, the operator inserts the medical device 1 according to the present embodiment into the blood vessel B through the first guide wire G1 to reach the lesion N, as shown in FIG. At this time, the first split piece 21, the second split piece 22, the third split piece 23, and the fourth split piece 24 are separated from each other. While the first segment 21, the second segment 22, the third segment 23, and the fourth segment 24 are separated from each other in this way, the medical device 1 is guided through the first guide wire G1. Since the medical device 1 is inserted into the blood vessel B, it is possible to prevent the medical device 1 from being caught on the first guide wire G1 and to insert it appropriately.

Next, the operator rotates the switching valve 70 around the axial direction so that the first communication lumen 72 of the switching valve 70 communicates with the first lumens 11 and with the second lumens 12 (see FIG. 8). The operator then supplies the working fluid from the supply unit 50 . As a result, as shown in FIG. 14, the fluid is supplied to the first moving part 30 through the first lumen 11 and the second lumen 12, and the first moving part 30, which is a balloon, expands to form the first splitting part. Piece 21 and second split piece 22 are adjacent to each other. As the first split piece 21 and the second split piece 22 approach each other, the first guide wire G1 is brought into contact with the first split piece 21 and the second split piece 22 to grip the first guide wire G1. (See FIG. 16).

Here, for example, if there is a clearance between the support catheter (medical device) and the first guide wire G1, as shown in FIG. Buckling occurs at a point a certain distance away from the side. On the other hand, according to the medical device 1 according to this embodiment, as shown in FIG. It is possible to suitably prevent bending.

In the support catheter 900 according to the comparative example, when L1 is the distance from the buckled portion of the first guide wire G1 to the tip, n is the end state, E is the elastic modulus, and I is the section modulus, The buckling resistance load P of one guide wire G1 can be calculated by P=nEIπ ² /L1 ² . Similarly, in the medical device 1 according to this embodiment, the axial distance at which the first guide wire G1 is exposed from the medical device 1 is L2, the end state is n, the elastic modulus is E, and the section modulus is I. , the buckling resistance load P of the first guide wire G1 can be calculated by P=nEIπ ² /L2 ² . That is, according to the medical device 1 according to the present embodiment, since the distance (L1>L2) can be shortened, the buckling resistance load P can be improved, and buckling of the first guide wire G1 can be prevented. It can be suitably suppressed.

Next, as shown in FIGS. 15 and 16, the operator moves the medical device 1 and the first guide wire G1 to the distal end while maintaining the state in which the medical device 1 grips and supports the first guide wire G1. move it to the side. At this time, since the first guide wire G1 is gripped by the medical device 1, the buckling load resistance P of the first guide wire G1 is improved, and the first guide wire G1 does not buckle, and the lesion area is treated. N can pass through.

Next, after removing the medical device 1, the operator causes a treatment device such as a balloon catheter to reach the lesion N via the first guide wire G1, and performs a predetermined treatment.

In the above description, the first guide wire G1 (0.014 inches) was used as the guide wire. Either the second guide wire G2 (eg, 0.018 inch) or the third guide wire G3 (eg, 0.035 inch) is used as appropriate depending on the condition of the lesion N.

For example, when using the second guide wire G2 as a guide wire, the medical device 1 grasps and supports the second guide wire G2. At this time, the operator moves the switching valve so that the second flow lumen 73 connects the first and third lumens 11 and 13 and the second and fourth lumens 12 and 14 in the axial direction of the switching valve 70 . 70 is rotated about the axial direction. The operator then supplies the working fluid from the supply unit 50 . As a result, the fluid is supplied to the second moving part 40 via the third lumen 13 and the fourth lumen 14, and the second moving part 40, which is a balloon, expands, and the third split piece 23 and the fourth split piece 23 expand. 24 are close to each other. As the third split piece 23 and the fourth split piece 24 approach each other, the second guide wire G2 is brought into contact with the third split piece 23 and the fourth split piece 24 to grip the second guide wire G2. (See FIG. 17).

When using the third guide wire G3 as a guide wire, the medical device 1 grasps and supports the third guide wire G3. At this time, the operator sets the initial state in which the first segment 21, the second segment 22, the third segment 23, and the fourth segment 24 are separated from each other without feeding the working fluid from the supply unit 50. Maintaining, the medical device 1 supports to grasp the third guide wire G3 (see FIG. 18).

Here, in the case of a support catheter in which the inner diameter of the guidewire lumen does not expand or contract, it is necessary to prepare a support catheter corresponding to the diameter of each guidewire. On the other hand, according to the medical device 1 according to the present embodiment, the first guide wire G1, the second guide wire G2, and the third guide wire G3 can be supported so as to be grasped, respectively. Any one of the first guide wire G1, the second guide wire G2, and the third guide wire G3 can be grasped and supported, which improves versatility.

As described above, the medical device 1 according to this embodiment includes the guidewire lumen 15, which is provided on the inner peripheral side of the shaft portion 10 extending in the axial direction and the distal end portion of the shaft portion 10. , a first split piece 21 and a second split piece 22 which are provided opposite to each other so as to be close to each other and can be separated from each other in a cross section perpendicular to the axis, and sandwich the first guide wire G1 in an adjacent state; and a first moving portion 30 that moves the second split piece 22 radially inward to bring it closer. According to the medical device 1 configured in this manner, the first moving section 30 moves the first segment 21 and the second segment 22 radially inward to bring them closer to each other, so that the first guide wire G1 can be sandwiched. Therefore, the first guide wire G1 can be supported so that the first guide wire G1 can pass through the lesion N preferably by suppressing the buckling of the first guide wire G1.

In addition, the first split piece 21 and the second split piece 22 are semicircular members having the same radius of curvature as the radius of the first guide wire G1 in the cross section perpendicular to the axis. According to the medical device 1 configured in this way, when the first split piece 21 and the second split piece 22 are brought close to each other, the first split piece 21 and the second split piece 22 more reliably guide the first guide. Wire G1 can be gripped and supported.

In addition, the medical device 1 is provided on the inner peripheral side of the distal end portion of the shaft portion 10, and is provided opposite to each other so as to be capable of approaching and separating from each other in the cross section perpendicular to the axis. The third split piece 23 and the fourth split piece 24 sandwiching the second guide wire G2 having an outer diameter different from G1, and the third split piece 23 and the fourth split piece 24 are moved radially inward and brought close to each other. It further has a second moving part 40 . According to the medical device 1 configured in this way, not only the first guide wire G1 but also the second guide wire G2 can be grasped and supported, so the versatility of the medical device 1 is improved.

In addition, the third split piece 23 and the fourth split piece 24 are semicircular members having the same radius of curvature as the radius of the second guide wire G2 in the cross section orthogonal to the axis. According to the medical device 1 configured in this way, when the third split piece 23 and the fourth split piece 24 are brought close to each other, the third split piece 23 and the fourth split piece 24 more reliably guide the second guide. Wire G2 can be gripped and supported.

Also, the first moving part 30 and the second moving part 40 are balloons that can be expanded by injecting fluid. According to the medical device 1 configured in this way, the first split piece 21 and the second split piece 22 as well as the third split piece 23 and the fourth split piece 24 can be easily moved radially inward. be able to.

Further, when the first split piece 21, the second split piece 22, the third split piece 23, and the fourth split piece 24 are separated from each other in the initial state, the first split piece 21, the second split piece 22, and the fourth split piece 21 are separated from each other. The third segment 23 and the fourth segment 24 are configured to allow passage of a third guide wire G3 having an outer diameter different from that of the first guide wire G1 and the second guide wire G2. According to the medical device 1 configured in this way, in addition to the first guide wire G1 and the second guide wire G2, the third guide wire G3 can also be grasped and supported. Versatility is further improved.

In addition, the medical device 1 includes a first lumen 11 through which the fluid injected into the balloon that moves the first split piece 21 moves, and a second lumen 11 through which the fluid injected into the balloon that moves the second split piece 22 moves. a lumen 12, a third lumen 13 through which the fluid injected into the balloon moving the third segment 23 moves, a fourth lumen 14 through which the fluid injected into the balloon moving the fourth segment 24 moves, and a switching valve 70 capable of switching the inflow of fluid to the first lumen 11 and the second lumen 12 or the third lumen 13 and the fourth lumen 14 . According to the medical device 1 configured in this manner, gripping of the first guide wire G1 or the second guide wire G2 can be switched simply by switching the switching valve 70, thereby facilitating work.

Although the medical device 1 according to the present invention has been described above through the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

For example, in the embodiments described above, the medical device 1 includes the third and fourth halves 23 and 24 and a second movement that moves the third and fourth halves 23 and 24 radially inward. and a part 40; However, the medical device may not have the third split piece 23 and the fourth split piece 24 and the second moving part.

In addition, in the above-described embodiment, the medical device 1 has the switching valve 70 that can switch between the first lumen 11 and the second lumen 12 or the third lumen 13 and the fourth lumen 14. . However, the medical device may not have the switching valve 70 . At this time, the medical device has a first supply section that supplies liquid to first lumen 11 and second lumen 12, and a second supply section that supplies liquid to third lumen 13 and fourth lumen 14, respectively. An independent configuration can be used.

Also, in the above-described embodiments, the first moving part 30 and the second moving part 40 were balloons that can be expanded by injecting fluid. However, the first moving part and the second moving part are not limited to balloons as long as they can move the first segment, the second segment, the third segment and the fourth segment.

1 medical device,
1A the tip of the medical device,
10 shaft portion,
11 first lumen,
12 second lumen,
13 third lumen,
14 fourth lumen,
15 guide wire lumen,
21 first segment,
22 second segment,
23 third segment,
24 fourth segment,
30 first moving part,
40 second moving part,
50 supply unit,
70 switching valve,
G1 first guide wire,
G2 second guide wire,
G3 third guide wire,
N lesion.

Claims (7)

an axially extending shaft portion having a guidewire lumen;
A first split piece and a first split piece are provided on the inner peripheral side of the distal end portion of the shaft portion and are provided opposite to each other so as to be separated from each other in the cross section orthogonal to the axis, and sandwich the first guide wire in a close state. two halves; and
a first moving part that moves the first split piece and the second split piece radially inward to bring them closer to each other. The medical device according to claim 1, wherein the first split piece and the second split piece are semicircular members having the same radius of curvature as the radius of the first guide wire in an axis-perpendicular cross section. Provided on the inner peripheral side of the distal end portion of the shaft portion, and provided opposite to each other so as to be close and separated in an axis-perpendicular cross-section, and having an outer diameter different from that of the first guide wire when in close proximity. a third split piece and a fourth split piece sandwiching the second guide wire;
The medical device according to claim 1 or 2, further comprising a second moving section that moves the third segment and the fourth segment inward in the radial direction to bring them closer together. The medical device according to claim 3, wherein the third split piece and the fourth split piece are semicircular members having the same radius of curvature as the radius of the second guide wire in an axis-perpendicular cross section. The medical device according to claim 3 or 4, wherein the first moving part and the second moving part are balloons expandable by injecting fluid. In an initial state in which the first split piece, the second split piece, the third split piece, and the fourth split piece are separated from each other,
The first segment, the second segment, the third segment, and the fourth segment are capable of passing through a third guide wire having an outer diameter different from that of the first guide wire and the second guide wire. 6. The medical device of claim 5, wherein the medical device comprises: a first lumen through which the fluid injected into the balloon that moves the first segment travels;
a second lumen through which the fluid injected into the balloon that moves the second segment travels;
a third lumen through which the fluid injected into the balloon that moves the third segment travels;
a fourth lumen through which the fluid injected into the balloon that moves the fourth segment travels;
7. The medical device according to claim 5, further comprising a switching valve capable of switching the inflow of the fluid to the first lumen and the second lumen or the third lumen and the fourth lumen.

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