JP7198806B2 - medical instruments - Google Patents

Description

The present invention relates to medical devices.

Some medical devices, such as a balloon in a balloon catheter, are placed in a biological lumen such as a blood vessel and inflated to perform a predetermined treatment. Conventional techniques involve inflating a balloon to partially occlude the aorta, rather than completely occluding it, thereby reducing blood flow to the lower extremities, etc., and increasing blood flow to the cerebral vessels, etc. by that amount. There is an instrument (see Patent Document 1).

Japanese translation of PCT publication No. 2002-537909

When the balloon partially occludes the biological lumen as in Patent Document 1, the balloon is not fixed to the biological lumen. In such a state, the balloon may move unintentionally due to an external force applied from, for example, blood flow, collide with the inner wall surface of the living body, and damage the inner wall surface of the living body.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a medical device that prevents an expansion member such as a balloon from accidentally contacting the inner wall surface of a biological lumen when the biological lumen is partially occluded. .

A medical device according to the present invention for achieving the above object comprises an elongated hollow member having a lumen, an expandable member expandable by a fluid supplied from the lumen of the hollow member, and the hollow member. an enclosing member configured to be displaceable radially outward in a direction intersecting the longitudinal direction of the member, and enclosing the expansion member in the radially outwardly displaced state. The enclosing member consists of a balloon expandable by supplying fluid, the hollow member comprises another lumen capable of supplying fluid to the balloon, and the balloon is ring-shaped.

According to the medical device of the present invention, the expansion member capable of partially closing the biological lumen is surrounded by the surrounding member from the outside in the radial direction intersecting the longitudinal direction of the hollow member. Therefore, it is possible to prevent the expansion member such as the balloon from accidentally contacting the inner wall surface of the body lumen during expansion.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the medical instrument which concerns on 1st Embodiment of this invention. It is a figure explaining the state which displaced the surrounding member of the said medical instrument. It is a figure explaining the state which expanded the balloon of the said medical instrument. FIG. 2 is a view corresponding to FIG. 1, showing a medical device according to a modification of the first embodiment; FIG. 3 is a view corresponding to FIG. 2, showing a medical device according to a modification of the first embodiment; 4 is a view corresponding to FIG. 3, showing a medical device according to a modification of the first embodiment; FIG. FIG. 2 is a diagram for explaining a medical instrument according to a second embodiment, and corresponds to FIG. 1; FIG. 10 is a diagram for explaining the medical device according to the second embodiment, and is a diagram for explaining a state in which the enclosing member is displaced. FIG. 9 is a diagram illustrating a state in which the enclosing member of the medical instrument according to the second embodiment is displaced following FIG. 8 ; FIG. 10 is a diagram illustrating a case where the balloon of the medical instrument according to the second embodiment is expanded following FIG. 9; FIG. 11 is a cross-sectional view showing an axis-perpendicular cross-section when the medical device according to the third embodiment is placed in a living body lumen; Fig. 12 is a cross-sectional view showing the expanded state of the balloon of Fig. 11; FIG. 12 is a cross-sectional view showing a modification of FIG. 11; It is a figure explaining the medical instrument concerning a 4th embodiment. FIG. 15 is a diagram illustrating the medical device according to FIG. 14 when the balloon is inflated;

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. The following description does not limit the technical scope or the meaning of terms described in the claims. Also, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may differ from the actual ratios. In the specification and drawings, the longitudinal direction of the hollow member 10, which will be described later, is hereinafter referred to as the longitudinal direction d. In addition, the circumferential direction or angular direction of the hollow member 10 in the axis-perpendicular cross section perpendicular to the longitudinal direction d of the hollow member 10 is described as the circumferential direction θ. Also, the radial direction or the radial direction in the cross section perpendicular to the axis of the hollow member 10 is described as the radial direction r.

1 to 3 are diagrams showing a medical device 100 according to a first embodiment of the invention.

The medical device 100 according to the present embodiment is used to partially occlude the aorta in a procedure such as cerebral infarction to reduce the blood flow in the lower extremities and increase the blood flow to the cerebral blood vessels. 1 to 3, the medical device 100 according to this embodiment has a hollow member 10, a balloon 20 (corresponding to an expansion member), and a surrounding member 30. As shown in FIG. Details will be described below.

(Hollow member)
The hollow member 10 is configured as an elongated and substantially cylindrical tubular member. The hollow member 10 comprises, as shown in FIG. 1, a tubular member 11 having a lumen 12 through which an expansion fluid for expanding the balloon 20 can flow, and a lumen 14 through which an expansion fluid can flow to displace the surrounding member 30. and a tubular member 13 comprising: Lumen 14 corresponds to the "other lumen" herein. Tubular member 11 is joined with balloon 20 having expansion space 21 . Tubular member 13 is joined with enclosing member 30 . The tubular members 11 and 13 are joined to each other by adhesion or fusion in this embodiment.

Although the hollow member 10 is composed of the tubular members 11 and 13 in this embodiment, the configuration of the hollow member 10 is not limited to the above as long as the balloon 20 can be expanded and the surrounding member 30 can be displaced.

The tubular member 11 is configured to be connectable to an indeflator (not shown), a syringe, or the like for expanding the balloon 20 in this embodiment. Similar to the tubular member 11 , the tubular member 13 is configured to be connectable to an indeflator, a syringe, or the like (not shown) for displacing the enclosing member 30 .

The lumen 12 of the tubular member 11 and the expansion space 21 of the balloon 20 communicate with each other through the opening 15 . The inner lumen 14 of the tubular member 13 and the expansion space 31 of the enclosing member 30 communicate with each other through the opening 16 . In this specification, the opening 15 corresponds to the first opening, and the opening 16 corresponds to the second opening.

Aperture 15 is provided for supplying inflation fluid to balloon 20 to inflate balloon 20 . Apertures 16 are provided for supplying expansion fluid to the enclosing member 30 to displace the enclosing member 30 . As shown in FIG. 1, the openings 15 and 16 are spaced apart in the circumferential direction .theta. The opening 15 is arranged inside the opening 16 in the radial direction r at least when the balloon 20 is inflated when the center of the ring shape of the enclosing member 30 is considered as a reference. 1, the opening 15 is spaced apart from the opening 16 by approximately 180 degrees in the circumferential direction .theta.. As shown in FIG.

However, if the medical device 100 can be fixed to the body lumen Bl by the surrounding member 30, and the balloon 20 can be arranged radially inward of the surrounding member 30 in the axis-perpendicular cross-section when introduced into the body lumen Bl, the opening is achieved. The specific positions of the parts 15 and 16 are not limited to the above. Further, the openings 15 and 16 are arranged at substantially the same position in the longitudinal direction d. However, if the surrounding member 30 can at least partially surround the balloon 20 when the balloon 20 is inflated and the surrounding member 30 is displaced outward in the radial direction r, the openings 15 and 16 are formed in the longitudinal direction d. It does not have to be exactly the same position.

The material of the hollow member 10 is not particularly limited as long as it can be appropriately flexibly deformed when introduced into a biological lumen. Examples include polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, Polymeric materials such as ionomers, or mixtures of two or more thereof, such as polyolefins, polyvinyl chloride, polyamides, polyamide elastomers, polyesters, polyester elastomers, polyurethanes, polyurethane elastomers, polyimides, fluororesins, or mixtures thereof, or the above 2 More than one species of polymeric material can be mentioned. Further, a contrast marker or the like can be provided at the tip of the hollow member 10 or the like so that the position of the medical instrument can be confirmed under fluoroscopy such as X-rays.

(balloon)
Balloon 20 includes an expansion space 21 that is expandable by a supply of expansion fluid delivered through lumen 12 of hollow member 10, as shown in FIGS. The balloon 20 is configured to change the occlusion rate of the space surrounded by the surrounding member 30 as the medical device 100 is placed in the body lumen and expands. In this embodiment, the balloon 20 is configured to have a substantially spherical shape when inflated, as shown in FIG. In this specification, the term “sphere” includes not only a perfect circle but also an ellipse in any cross section passing through the center of the solid. The balloon 20 is joined to the hollow member 10 by adhesion, fusion, or the like so that the expansion space 21 communicates with the lumen 12 of the tubular member 11 forming the hollow member 10 through the opening 15 . The balloon 20 is configured to be positioned on the cylindrical side surface of the tubular member 11 that constitutes the hollow member 10 . However, the relative positional relationship with the hollow member 10 is not limited to the above, as long as the occlusion rate of the inserted biological lumen can be adjusted when inserted into the biological lumen.

The material of the balloon 20 is not particularly limited as long as it has a certain degree of flexibility. For example, polyethylene, polypropylene, polyolefins such as ethylene-propylene copolymers, polyesters such as polyethylene terephthalate, polyvinyl chloride, ethylene-vinyl acetate copolymers, cross-linked ethylene-vinyl acetate copolymers, polyurethanes and the like. Examples include plastic resins, polyamides, polyamide elastomers, silicone rubbers, latex rubbers, and the like.

(surrounding member)
The surrounding member 30 is configured to be displaceable outward in a radial direction r that intersects the longitudinal direction d of the hollow member 10, as shown in FIG. The surrounding member 30 surrounds the balloon 20 from the outside in the radial direction r in a state of being displaced outward in the radial direction r as shown in FIG. Surrounding member 30 has a balloon with an expansion space 31 that is expandable by a supply of expansion fluid as shown in FIG. The enclosing member 30 is displaced outward in the radial direction r by being expanded by supplying expansion fluid.

The surrounding member 30 is joined to the hollow member 10 by adhesion, fusion, or the like so that the expansion space 31 communicates with the lumen 14 of the tubular member 13 forming the hollow member 10 through the opening 15 . Surrounding member 30 is configured to comprise a single generally ring-shaped balloon in this embodiment.

The surrounding member 30 is provided with the opening 16 on the opposite side of the opening 15 in the circumferential direction θ, and is formed in a substantially ring shape, thereby surrounding the balloon 20 from the outside during expansion as described above. It transforms like In addition, the angle between the openings 15 and 16 in the circumferential direction θ may not be strictly 180 degrees, and may be about plus or minus 2 or 3 degrees.

The material of the enveloping member 30 is also not particularly limited, but for example, the same material as that of the balloon 20 can be used.

(Example of use)
Next, a usage example using the medical device 100 according to this embodiment will be described. In the medical device 100 according to this embodiment, a puncture site is formed in the femoral artery or the like with a puncture needle, and a guide wire (not shown) is introduced therethrough. Next, an introducer (not shown) is inserted into the puncture site, and a guiding catheter (not shown) is introduced into the living body through the lumen of the introducer.

Next, the medical device 100 is inserted into the lumen of the guiding catheter and introduced into the body lumen Bl through the guiding catheter. Then, it is moved to a target site such as the aorta while confirming with an X-ray image or the like. When the medical device 100 reaches the target site, the expansion fluid is supplied to the lumen 14 of the tubular member 13 that constitutes the hollow member 10, and the enclosing member 30 is displaced outward in the radial direction r as shown in FIG. expand). Then, the surrounding member 30 is brought close to the living body lumen Bl to such an extent that it contacts the inner wall surface of the living body lumen Bl.

Next, an expansion fluid is supplied to the lumen 12 of the tubular member 11 forming the hollow member 10 to expand the balloon 20 as shown in FIG. By surrounding the balloon 20 with the surrounding member 30, it is possible to prevent the balloon 20 from accidentally contacting the inner wall surface of the biological lumen Bl when the balloon 20 is moved by an external force such as blood flow.

In addition, by appropriately expanding the balloon 20 inward in the radial direction r from the surrounding member 30, the biological lumen Bl in which the medical device 100 is placed can be partially closed as intended by the operator. As a result, it is possible to increase the amount of blood flowing through sites other than the peripheral organs where the medical device 100 is placed, such as cerebral blood vessels. In addition, by surrounding the balloon 20 with the surrounding member 30, the balloon 20 can be made difficult to move due to an external force, and it is possible to suppress unexpected fluctuations in the occlusion rate of the biological lumen Bl.

As described above, the medical device 100 according to this embodiment has the hollow member 10, the balloon 20, and the surrounding member 30. As shown in FIG. Hollow member 10 is elongated and includes lumens 12,14. The balloon 20 is configured to be expandable by fluid supplied from the lumen 12 of the tubular member 11 forming the hollow member 10 . The surrounding member 30 is configured to be displaceable outward in a radial direction r that intersects the longitudinal direction d of the hollow member 10, and surrounds the balloon 20 in a state of being displaced outward in the radial direction r.

By configuring the medical device 100 as described above, the biological lumen Bl such as the aorta can be partially occluded by the balloon 20 . In addition, by surrounding the balloon 20 with the surrounding member 30, it is possible to prevent the balloon 20 from accidentally contacting the inner wall surface of the biological lumen Bl when the balloon 20 is inflated.

Further, the occlusion rate of the space surrounded by the surrounding member 30 is configured to change as the balloon 20 expands. Therefore, the occlusion rate can be appropriately adjusted according to the patient using the medical device 100 and the condition of the patient.

In addition, the enclosing member 30 is composed of a balloon having an expansion space 31 that can be expanded by supplying fluid. The tubular member 13 forming the hollow member 10 is configured to have a lumen 14 for supplying fluid to the enclosing member 30 . Therefore, the balloon of the enclosing member 30 can be expanded. Therefore, for example, the balloon of the surrounding member 30 is expanded first, and the balloon 20 is expanded while the expanded surrounding member 30 surrounds the balloon 20, thereby adjusting the occlusion rate of the biological lumen Bl.

Also, the balloon of the surrounding member 30 is configured to have a substantially ring shape. By configuring the surrounding member 30 as described above, the balloon 20 is arranged inside the ring-shaped surrounding member 30 in the radial direction r, and the balloon 20 is prevented from inadvertently contacting the inner wall surface of the biological lumen Bl during expansion. can be suppressed.

In addition, the balloon 20 is configured to have a spherical shape that can be arranged radially inward of the surrounding member 30 when inflated. Therefore, when the medical device 100 is placed in the biological lumen Bl, the degree of expansion of the balloon 20 can be used to easily adjust the occlusion rate of the biological lumen Bl. Further, by configuring the balloon 20 in a spherical shape, even if the balloon 20 moves due to an external force such as blood flow, it is possible to prevent the occlusion rate of the body lumen Bl from changing unintentionally.

In addition, the hollow member 10 has an opening 15 communicating between the lumen 12 of the tubular member 11 constituting the hollow member 10 and the expansion space 21 of the balloon 20, and the lumen 14 of the tubular member 13 constituting the hollow member 10. and an opening 16 that communicates with the expansion space 31 of the surrounding member 30 . The opening 15 is arranged on the side opposite to the opening 16 in the circumferential direction θ of the hollow member 10 when the balloon 20 is inflated. Therefore, the balloon 20 can be arranged radially inward of the substantially ring-shaped surrounding member 30 to prevent the balloon 20 from inadvertently contacting the inner wall surface of the biological lumen Bl during expansion.

(Modified example of the first embodiment)
4 to 6 are diagrams explaining a medical device 100a according to a modification of the first embodiment. It has been described above that the balloon 20 is formed in a spherical shape that is disposed inside in the radial direction r with respect to the substantially ring-shaped surrounding member 30 when inflated. However, it can also be configured as follows. In addition, since the hollow member 10 and the enclosing member 30 in this modified example are common to those in the first embodiment, description thereof is omitted.

In this modified example, the balloon 20a is configured to deform into a substantially ring shape when expanded, like the surrounding member 30, as shown in FIG. The balloon 20a is configured to be arranged radially inward of the expanded portion of the enclosing member 30 when expanded. By configuring the balloon 20a as described above, the body lumen Bl in which the medical device 100 is placed is not completely blocked, and the occlusion rate can be adjusted while ensuring blood flow. Note that the usage example of the medical device 100a in this modified example is the same as in the first embodiment, so the description is omitted.

(Second embodiment)
7 to 10 are diagrams for explaining a medical device 100b according to a second embodiment of the present invention. In the first embodiment, the hollow member 10 is flexibly deformed according to the shape of the living body lumen when introduced into the living body lumen, but it can also be configured as follows.

A medical device 100b according to the second embodiment, which will be outlined with reference to FIGS. 7 to 10, has a hollow member 10b, a balloon 20b, and a surrounding member 30b. The medical device 100b also includes a guiding catheter 40. As shown in FIG.

(Hollow member)
The hollow member 10b is formed in a long, hollow tubular shape as in the first embodiment. The hollow member 10b includes a tubular member 11b and a tubular member 13b.

As shown in FIG. 7, the tubular member 11b is elongated and has a lumen 12b as in the first embodiment. Tubular member 11b is joined at its distal end to balloon 20b so as to supply inflation fluid from lumen 12b to inflation space 21b of balloon 20b, as shown in FIG. The tubular member 13b is configured in an elongated shape having a lumen 14b as in the first embodiment. Tubular member 13b joins enclosing member 30b at its distal end so as to supply expansion material from lumen 14b to expansion space 31b of enclosing member 30b.

As shown in FIG. 8, the hollow member 10b is configured to have a bent portion 17 at an intermediate portion in the longitudinal direction d that can be bent outward in the radial direction r when the balloon 20b and the surrounding member 30b are expanded. .

As shown in FIGS. 7 and 8, the bending portion 17 gradually bends the balloon 20b from a substantially linear shape outward in the radial direction r as the fluid is supplied to the lumen 12b of the tubular member 11b. It is displaced outward in the radial direction r. As the fluid is supplied to the lumen 14b of the tubular member 13b, the bent portion 17 gradually bends outward in the radial direction r, displacing the surrounding member 30b outward in the radial direction r. The hollow member 10b has the same configuration as the first embodiment, except that the hollow member 10b does not have an opening on the side surface of the cylindrical shape like the hollow member 10 of the first embodiment. .

(balloon)
The balloon 20b is provided at the distal end of the hollow member 10b in this embodiment. In this embodiment, the balloon 20b is configured to be bonded to the inner peripheral portion of the substantially ring-shaped surrounding member 30b by adhesion, fusion, or the like. However, if the balloon 20b can be surrounded by the surrounding member 30b when the surrounding member 30b is expanded, the balloon 20b does not have to be joined to the surrounding member 30b. The configuration of the balloon 20b other than the above is the same as that of the balloon 20 of the first embodiment, so description thereof will be omitted.

(surrounding member)
Since the enclosing member 30b is the same as the enclosing member 30 of the first embodiment, description thereof is omitted.

(Guiding catheter)
A guiding catheter 40 is arranged to accommodate the hollow member 10b. As with the hollow member 10, the guiding catheter 40 has a substantially cylindrical and elongated shape. The guiding catheter 40 can be moved to the target site with the balloon 20b and the surrounding member 30b accommodated in the lumen of the guiding catheter 40 until the target site such as the aorta is reached in the biological lumen Bl. Further, the guiding catheter 40 includes a tip opening 41 through which the balloon 20b and the surrounding member 30b can be exposed in the body lumen, as shown in FIG. 8 and the like. In this embodiment, the guiding catheter 40 is configured to be included in the medical device 100b. However, it may be configured as a component separate from the medical device 100b. Also, the material of the guiding catheter 40 can be the same as that of the hollow member 10 . Also, an introducer sheath, a guiding sheath, or the like may be used instead of the guiding catheter.

(Example of use)
Next, a usage example of the medical device 100b according to this embodiment will be described. First, as in the first embodiment, a puncture site is formed in the femoral artery or the like with a puncture needle or the like, and a guide wire is introduced therethrough. Next, the introducer is inserted into the puncture site, and the guiding catheter 40 is introduced into the living body through the lumen of the introducer.

Next, the medical device 100b is inserted into the lumen of the guiding catheter 40 and introduced through the guiding catheter 40 into the biological lumen Bl. Then, it is moved to a target site such as the aorta while confirming with an X-ray image or the like.

When the medical device 100b reaches the target site, the balloon 20b and the surrounding member 30b are exposed from the tip opening 41 of the guiding catheter 40. FIG. Then, an expansion fluid is supplied to the lumen 14b of the tubular member 13b constituting the hollow member 10b to expand the surrounding member 30b to such an extent that it can come into contact with the inner wall surface of the biological lumen Bl as shown in FIGS. . When the enclosing member 30b expands, the bent portion 17 of the hollow member 10b is supplied with the expanding fluid to displace the enclosing member 30b outward in the radial direction r as shown in FIG.

Next, an expansion fluid is supplied to the lumen 12b of the tubular member 11b forming the hollow member 10b to expand the balloon 20b as shown in FIG. When the balloon 20b is inflated, the bending portion 17 displaces the balloon 20b outward in the radial direction r as the inflation fluid is supplied.

By expanding the balloon of the surrounding member 30b as in the first embodiment, the balloon 20b can be surrounded from the outside in the radial direction r, and the contact of the balloon 20b with the inner wall surface of the living body lumen Bl can be suppressed.

Further, by appropriately expanding the balloon 20b inward in the radial direction r from the surrounding member 30b, the biological lumen Bl in which the medical device 100b is placed can be partially closed as intended by the operator. Thus, the medical device 100b can increase blood flow to sites other than peripheral organs such as cerebral blood vessels.

As described above, the hollow member 10b is configured to have the bent portion 17 that arranges the balloon 20b outward in the radial direction r with respect to the hollow member 10b when the balloon 20b is expanded. Therefore, it is possible to arrange the surrounding member 30b outward in the radial direction r and to position the balloon 20b more inward than the surrounding member 30b. Therefore, it is possible to prevent the balloon 20b from contacting the inner wall surface of the biological lumen Bl when the medical device 100b is placed in the biological lumen Bl. In addition, the bending portion 17 not only deforms the medical device 100b to match the shape of the living body lumen Bl, but also allows the hollow member 10b or the guiding catheter 40 that constitutes the medical device 100b to move along the living body lumen Bl in the radial direction r. contact with the inner wall surface of the

(Third Embodiment)
11 and 12 are cross-sectional views perpendicular to the axis showing a medical device 100c according to a third embodiment of the present invention, and FIG. 13 is a cross-sectional view showing a modification of FIG. In the first embodiment and the second embodiment, the surrounding member 30 has been described as a single member that forms a substantially ring-shaped balloon, but it can also be constructed as follows. Since the configurations of the hollow member 10 and the balloon 20 are the same as those of the first embodiment, description thereof will be omitted.

In the present embodiment, the surrounding member 30c is configured to include a plurality of balloons, specifically three balloons, arranged side by side on the outer periphery of the balloon 20 as shown in FIG. By providing a plurality of balloons as described above, the surrounding member 30c can easily form a space between the balloons compared to the case where the balloons are composed of one member. Therefore, while the body lumen Bl in which the medical device 100c is placed is partially blocked, the blood flow in the body lumen Bl can be easily ensured together with the expansion of the balloon 20 shown in FIG. The hollow member is the same as in the first embodiment, except that each tubular member is joined to each of the three balloons, so description thereof will be omitted.

In FIG. 11, the number of balloons constituting the surrounding member 30c is three. is not limited to the above. As shown in the enclosing member 30d of the medical device 100d in FIG. 13, six balloons may be provided, or more balloons may be provided. Also, the procedure using the medical device 100c is the same as in the first embodiment except that the expansion fluid is supplied to each of the three balloons, so the explanation is omitted.

As described above, the medical device 100c according to the third embodiment is configured to include a plurality of balloons arranged side by side in the circumferential direction θ outside the balloon 20 in the radial direction r when the surrounding member 30c is expanded. there is Therefore, the blood flow can be easily ensured while partially blocking the living body lumen Bl in which the medical device 100c is arranged.

(Fourth embodiment)
14 and 15 are diagrams for explaining a medical device 100e according to a fourth embodiment of the present invention.

In the first embodiment, an embodiment has been described in which the balloon 20 is configured by a spherical balloon and the surrounding member 30 is configured by a substantially ring-shaped balloon that surrounds the balloon 20 outside in the radial direction r when inflated. However, as long as the surrounding member surrounds the balloon from the outside in the radial direction r and the balloon can adjust the occlusion rate of the biological lumen Bl, the specific aspects of the surrounding member and the expanding member are not limited to the above.

The medical device 100e has a hollow member 10e, a balloon 20e, a surrounding member 30e, and a guiding catheter 40e, as shown in FIG. 14 and the like.

(Hollow member)
The hollow member 10e is configured to be housed in the lumen of the guiding catheter 40e.

(balloon)
The balloon 20e is joined to the hollow member 10e so that the fluid for expanding the balloon 20e can be supplied at the distal end of the hollow member 10e as in the second embodiment. As shown in FIG. 15, the balloon 20e is elongated so that it can be expanded along the surrounding member 30e. Since other configurations of the hollow member 10e and the balloon 20e are the same as those of the first embodiment, description thereof is omitted.

(surrounding member)
The surrounding member 30e is configured to be housed in the lumen of the guiding catheter 40e. The enclosing member 30e is configured such that the distal end portion 33e can protrude from the opening 41e of the guiding catheter 40e. A distal end portion 33e of the surrounding member 30e is shaped like an arc as shown in FIG. 14 in a state in which it is not housed in the lumen of the guiding catheter 40e, that is, in a natural state where no external force is applied.

The material of the enclosing member 30e is not particularly limited as long as it is a wire-like member that can be deformed into an arc shape with the distal end portion 33e exposed from the opening 41e of the guiding catheter 40e. For example, titanium-based (Ti-No, Ti-Pd, Ti-Nb-Sn, etc.) and copper-based shape memory alloys, acrylic resins, trans-isoprene polymers, polynorbornene, styrene-butadiene copolymers, polyurethanes, etc. shape memory resin, stainless steel (SUS304), β-titanium steel, and alloys having spring properties such as Co—Cr alloys can be used.

(Guiding catheter)
The guiding catheter 40e is the same as the guiding catheter 40 of the second embodiment, except that the opening 41e is provided on the side surface of the cylinder, so the explanation is omitted.

(Example of use)
Next, a usage example of the medical instrument 100e according to this embodiment will be described. First, as in the first embodiment, a puncture site is formed in the femoral artery or the like with a puncture needle or the like, and a guide wire is introduced therethrough. Next, the introducer is inserted into the puncture site, and the guiding catheter 40e is introduced into the living body through the lumen of the introducer.

Next, the medical device 100e is inserted into the lumen of the guiding catheter 40e and introduced into the biological lumen Bl through the guiding catheter 40e. Then, it is moved to a target site such as the aorta while confirming with an X-ray image or the like.

When the medical device 100e reaches the target site, the balloon 20e and the surrounding member 30e are exposed through the opening 41e of the guiding catheter 40e. The surrounding member 30e is formed in a substantially arcuate shape as described above, and deforms into a substantially arcuate shape along the inner wall surface of the biological lumen Bl when exposed to the outside from the opening 41e. The balloon 20e is arranged along the shape of the enclosing member 30e.

Next, an indeflator (not shown) or the like is used to inflate the balloon 20e. The balloon 20e is arranged inside the surrounding member 30e in the radial direction r during expansion as in the first embodiment. Therefore, the balloon 20e itself can be prevented from accidentally contacting the inner wall surface of the biological lumen Bl.

Further, similarly to the first embodiment and the like, the occlusion rate of the biological lumen Bl can be adjusted as intended by the operator according to the degree of expansion of the balloon 20e.

As described above, in the medical device 100e according to the fourth embodiment, the enclosing member 30e includes an arc-shaped wire with the distal end portion 33e shaped in a natural state where no external force is applied. . With this configuration, the surrounding member 30e also surrounds the balloon 20e from the outside in the radial direction r, so that the balloon 20e can be prevented from accidentally contacting the inner wall surface of the biological lumen Bl.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Although an embodiment in which the hollow member 10 includes tubular members 11 and 13 has been described above, the configuration of the hollow member 10 is not limited to the above as long as the balloon 20 can be expanded and the surrounding member 30 can be displaced. In addition to the above, the hollow member 10 may be configured, for example, by dividing the lumen of one hollow tubular member by a partition or the like to prepare lumens for supplying fluid to the balloon 20 and the enclosing member 30 .

Also, in the modified example of the first embodiment, an embodiment has been described in which the balloon 20a is deformed into a substantially ring shape during expansion in the same manner as the surrounding member 30a. The specific configuration of the balloon 20a is not particularly limited as long as the balloon 20a can be expanded as shown in FIG. For example, partition walls may be provided in the lumen of the balloon 20a, and when pressure above a certain level is applied, one or more of the partition walls may be ruptured to expand the balloon 20a.

This application is based on Japanese Patent Application No. 2018-065060 filed on March 29, 2018, the disclosure of which is incorporated herein by reference.

100, 100a, 100b, 100c medical instruments,
10, 10a, 10b, 10c, 10e hollow member,
12 Lumen,
14 (other) lumens,
15 (first) opening,
16 (second) opening,
16 bends,
20, 20a, 20b, 20c, 20e balloon (expansion member),
21 extended space,
30, 30b surrounding member (balloon),
31 extended space,
33e tip,
r radial direction,
θ circumferential direction.

Claims (7)

a hollow member configured in an elongated shape and having a lumen;
an expansion member expandable by fluid supplied from the lumen of the hollow member;
an enclosing member configured to be displaceable radially outward in a direction intersecting the longitudinal direction of the hollow member, and enclosing the expansion member in the radially outwardly displaced state ;
the enclosing member comprises a balloon expandable by supply of fluid;
the hollow member comprises another lumen capable of supplying fluid to the balloon;
The medical device , wherein the balloon is ring-shaped . a hollow member configured in an elongated shape and having a lumen;
an expansion member expandable by fluid supplied from the lumen of the hollow member;
an enclosing member configured to be displaceable radially outward in a direction intersecting the longitudinal direction of the hollow member, and enclosing the expansion member in the radially outwardly displaced state;
A medical device , wherein the expansion member comprises a spherical shape . a hollow member configured in an elongated shape and having a lumen;
an expansion member expandable by fluid supplied from the lumen of the hollow member;
an enclosing member configured to be displaceable radially outward in a direction intersecting the longitudinal direction of the hollow member, and enclosing the expansion member in the radially outwardly displaced state;
The medical device , wherein the expansion member is ring-shaped in the expanded state . a hollow member configured in an elongated shape and having a lumen;
an expansion member expandable by fluid supplied from the lumen of the hollow member;
an enclosing member configured to be displaceable radially outward in a direction intersecting the longitudinal direction of the hollow member, and enclosing the expansion member in the radially outwardly displaced state;
The medical instrument according to claim 1, wherein the enclosing member is a wire member having an arc-shaped distal end portion in a natural state where no external force is applied . The hollow member has a first opening that communicates the lumen of the hollow member with the expansion space of the expansion member, and a second opening that communicates the other lumen of the hollow member with the expansion space of the balloon. comprising an opening and
2. The medical device of claim 1 , wherein the first opening is positioned opposite the second opening in the circumferential direction of the hollow member when the expansion member is expanded . a hollow member configured in an elongated shape and having a lumen;
an expansion member expandable by fluid supplied from the lumen of the hollow member;
an enclosing member configured to be displaceable radially outward in a direction intersecting the longitudinal direction of the hollow member, and enclosing the expansion member in the radially outwardly displaced state;
the enclosing member comprises a balloon expandable by supply of fluid;
the hollow member comprises another lumen capable of supplying fluid to the balloon;
The medical device , wherein the enclosing member comprises a plurality of the balloons arranged side by side around the expansion member when expanded . 7. The medical treatment according to any one of claims 1, 5, and 6, wherein the hollow member comprises a bent portion that disposes the balloon outward in the radial direction with respect to the hollow member when the balloon is expanded. instrument.

Images