JP2021049256A - Balloon catheter - Google Patents

Abstract

To provide a balloon catheter that has a simple configuration but can improve pushability of a balloon and suppress damage to a medical wire, thereby suppressing twisting of the balloon.SOLUTION: A balloon catheter 10 includes: an outer tube 24; an inner tube 50, an outer tube hub 26; and a balloon 22 for connecting a tip of the outer tube 24 to a tip of the inner tube 50. The outer tube 24 has an inner peripheral shape formed along an outer peripheral shape of the balloon 22. The outer tube hub 26 is provided with a first engaging part 72. The inner tube 50 is provided with a second engaging part 74. The first engaging part 72 and the second engaging part 74 engage each other to restrict the outer tube hub 26 and the inner tube 50 from rotating relatively to each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a balloon catheter.

For example, Patent Document 1 discloses a balloon catheter for treating a lesion (stenosis or occlusion) of the fallopian tube. This balloon catheter includes a flexible outer tube, an inner tube arranged in the inner tube of the outer tube so as to be movable in the axial direction with respect to the outer tube, and the tip and inner tube of the outer tube. It is provided with an annular balloon that connects the tips to each other. The balloon is led out toward the tip of the outer tube while being supported by a fallopian tube mirror (medical wire rod) inserted inside the balloon by inflating inward in the radial direction of the outer tube.

Japanese Patent No. 3921108

By the way, in a balloon catheter, the lumen of the outer tube is formed in a semicircular shape, and the inner tube, balloon and salpingoscope are inserted into the semicircular lumen, and the relative rotation between the inner tube and the outer tube is performed. A rotation control member is provided in the inner pipe to prevent (twisting of the balloon). However, since the balloon having a circular outer shape is inserted into the semicircular lumen, a relatively large gap is formed between the outer tube and the balloon. Then, the balloon and the fallopian tube are likely to bend in the lumen of the outer tube. If the balloon and the fallopian tube are excessively flexed, the force to advance the balloon from the inner tube to the balloon cannot be efficiently transmitted (the pushability of the balloon is reduced), and the fallopian tube is damaged. There is a risk of

The present invention has been made in consideration of such a problem, and a simple configuration can improve the pushability of the balloon, suppress damage to the medical wire, and suppress twisting of the balloon. It is an object of the present invention to provide a balloon catheter capable of providing a balloon catheter.

One aspect of the present invention is an outer tube having flexibility, an inner tube arranged in the lumen of the outer tube so as to be movable in the axial direction with respect to the outer tube, and a base of the outer tube. An outer tube hub provided at an end, an annular balloon that connects the tip of the outer tube and the tip of the inner tube to each other and bulges inward in the radial direction of the outer tube, is provided. Inside, a balloon catheter in which a medical wire rod led out toward the tip of the outer tube is inserted together with the balloon while supporting the inflated balloon, and the outer tube has an outer peripheral shape of the balloon. The outer tube hub is provided with a first engaging portion, the inner tube is provided with a second engaging portion, and the first engaging portion and the second engaging portion are provided. The junction is a balloon catheter that engages with each other to regulate the relative rotation of the outer tube hub and the inner tube.

According to the present invention, since the inner peripheral shape of the outer tube follows the outer peripheral shape of the balloon, the gap between the outer tube and the balloon can be relatively narrowed. This makes it possible to reduce the deflection of the balloon and the medical wire in the lumen of the outer tube. Therefore, with a simple configuration, the pushability of the balloon can be improved and damage to the medical wire can be suppressed. Further, the first engaging portion provided on the outer pipe hub and the second engaging portion provided on the inner pipe engage with each other to rotate the outer pipe (outer pipe hub) and the inner pipe relative to each other. Can be regulated. Therefore, the twisting of the balloon can be suppressed.

It is a schematic block diagram of the balloon catheter which concerns on one Embodiment of this invention. It is a partially omitted vertical sectional view of the balloon catheter of FIG. FIG. 3A is a cross-sectional view taken along the line IIIA-IIIA of FIG. 2, and FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB of FIG. It is 1st explanatory view of the salpingoscopic tuboplasty using the balloon catheter of FIG. FIG. 2 is a second explanatory view of salpingoscopic tuboplasty using the balloon catheter of FIG. FIG. 3 is a third explanatory view of salpingoscopic tuboplasty using the balloon catheter of FIG. FIG. 4 is a fourth explanatory view of salpingoscopic tuboplasty using the balloon catheter of FIG.

Hereinafter, a suitable embodiment of the balloon catheter according to the present invention will be described with reference to the accompanying drawings.

The balloon catheter 10 according to an embodiment of the present invention is used, for example, in tuboplasty for treating a lesion (stenosis, occlusion, etc.) of the fallopian tube. However, the balloon catheter 10 may be used for treating lesions in biological organs such as blood vessels, bile ducts, trachea, esophagus, urethra, and other organs other than the oviduct.

In FIGS. 1 and 2, the balloon catheter 10 is provided at the outer catheter 16, the slider 18 provided on the outer catheter 16, the inner catheter 20 inserted into the outer catheter 16, and the tip of the inner catheter 20. The balloon 22 is provided.

The outer catheter 16 has a long flexible outer tube 24, an outer tube hub 26 provided at the proximal end of the outer tube 24, and a fixing screw 28 provided on the outer tube hub 26. The total length of the outer tube 24 is preferably set to 100 mm or more and 1500 mm or less, and more preferably 200 mm or more and 1000 mm or less.

In FIG. 2, the outer tube 24 includes an outer tube main body 30 and a tip tip 32 provided at the tip end portion of the outer tube main body 30. Examples of the constituent materials of the outer tube main body 30 and the tip tip 32 include polyolefin (for example, polyethylene, polypropylene, polybutene, etc.), olefin elastomer, polyester (for example, polyethylene terephthalate, etc.), polyester elastomer, and soft polyvinyl chloride. Examples thereof include flexible polymer materials such as vinyl, polyurethane, urethane-based elastomers, polyamides, amide-based elastomers, polytetrafluoroethylene, fluororesin elastomers, polyimides, ethylene-vinyl acetate copolymers, and silicone rubbers.

The outer tube main body 30 is a single lumen tube in which a first lumen 30a penetrating from the tip end to the base end is formed. The first lumen 30a is formed in a circular shape when viewed from the axial direction of the outer tube main body 30. That is, the outer tube main body 30 has a circular inner peripheral shape.

The outer tube main body 30 has a substantially constant outer diameter from the tip end to the base end. The tip end side of the outer tube body 30 is shaped so as to be curved in an arc shape in the axial direction. In FIG. 3A, the wall thickness T of the outer tube main body 30 is set to 0.15 mm or more and 1.5 mm or less. The wall thickness T is preferably set to 0.2 mm or more, and more preferably 0.3 mm or more.

As shown in FIG. 2, the outer surface of the tip tip 32 is curved to prevent damage to the balloon catheter 10 and living tissue. The tip tip 32 is formed with a balloon lead-out hole 32a for leading the balloon 22 toward the tip of the tip tip 32.

The outer tube hub 26 is made of hard resin or metal (stainless steel, titanium, titanium alloy, etc.). Examples of the hard resin include polycarbonate, acrylic resin, polyester, polyolefin, styrene resin, polyamide, polysulfone, polyarylate, polyetherimide and the like.

The outer tube hub 26 is formed in a hollow shape so as to be easily operated by human hands. The outer tube hub 26 has a first space 34 communicating with the first lumen 30a of the outer tube 24, and a first insertion hole 36 located on the proximal end side of the first space 34 through which the inner catheter 20 is inserted. An introduction port 38 communicating with the first space 34 is formed.

The introduction port 38 introduces a balloon operating fluid supplied from a syringe or the like (not shown) into the first space 34. The balloon operating fluid is a fluid for inflating the balloon 22 inward in the radial direction of the outer tube 24, and is, for example, physiological saline. The outer pipe hub 26 is provided with a first seal member 42 for preventing the fluid in the first space 34 from leaking to the outside through the first insertion hole 36.

The fixing screw 28 fixes the inner catheter 20 to the outer tube hub 26 by screwing into the screw hole 44 formed at the base end portion of the outer tube hub 26. Examples of the constituent material of the fixing screw 28 are the same as those of the outer tube hub 26.

The slider 18 is provided on the outer peripheral surface of the outer pipe 24 in a state where it can be moved (sliding) in the axial direction of the outer pipe 24. The total length of the slider 18 is shorter than the total length of the outer pipe 24. The slider 18 has a long tubular slider main body 46 and a slider hub 48 provided at a base end portion of the slider main body 46. Each of the slider body 46 and the slider hub 48 is made of the same material as the outer tube hub 26 described above.

The slider hub 48 is formed in an annular shape in a size that is easy to operate manually.

In a state where the slider 18 is moved to the most proximal side with respect to the outer pipe 24 (a state where the proximal end of the slider 18 is positioned at the tip of the outer pipe hub 26), the tip side of the outer pipe 24 is from the slider 18. Is exposed to the tip side and curved in an arc shape. With the slider 18 moved to the most distal end side with respect to the outer tube 24, the distal end side of the outer tube 24 extends linearly along the shape of the slider main body 46.

The inner catheter 20 includes a long inner tube 50 and an inner tube hub 52 provided at the proximal end of the inner tube 50. The total length of the inner pipe 50 is preferably set to 100 mm or more and 1500 mm or less, and more preferably 200 mm or more and 1000 mm or less.

The inner tube 50 is made of a relatively hard resin (for example, fluororesin, polycarbonate, polyimide, PEEK resin, etc.) or a metal (for example, stainless steel, titanium, titanium alloy, etc.). The inner tube 50 is a tube body having a second lumen 50a penetrating from the tip end to the base end.

The inner pipe 50 is arranged in the first lumen 30a of the outer pipe 24 while inserting the first space 34 and the first insertion hole 36 of the outer pipe hub 26. The tip of the inner tube 50 is located in the proximal direction with respect to the tip of the outer tube 24. An outer lumen 54 through which the balloon operating fluid flows is provided between the inner pipe 50 and the outer pipe 24.

A fallopian tube mirror 15 as a medical wire is inserted into the second lumen 50a of the inner tube 50. The fallopian tube mirror 15 is an endoscope for photographing the inside of the fallopian tube. With the fallopian tube mirror 15 inserted in the second lumen 50a of the inner tube 50, an inner lumen 56 (perfusion lumen) through which a perfusion fluid flows is provided between the inner tube 50 and the fallopian tube mirror 15. It is formed. The perfusion fluid is, for example, saline.

The inner tube hub 52 is made of the same material as the outer tube hub 26. The inner tube hub 52 is formed in a hollow shape. The inner tube hub 52 has a second space 58 communicating with the second lumen 50a of the inner tube 50, and a second insertion hole 60 located on the proximal end side of the second space 58 and through which the oviduct mirror 15 is inserted. , An introduction port 62 communicating with the second space 58 is formed.

The introduction port 62 introduces a perfusion fluid supplied from a perfusion pump or the like (not shown) into the second space 58. The inner pipe hub 52 is provided with a second seal member 66 that prevents the fluid in the second space 58 from leaking to the outside through the second insertion hole 60.

The balloon 22 is an annular member that connects the tip of the outer tube 24 and the tip of the inner tube 50 to each other. The balloon 22 inflates inward in the radial direction of the outer tube 24. In other words, the balloon 22 is formed so as to be elastically deformable in the radial direction. Examples of the constituent materials of the balloon 22 include natural rubber, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, soft polyvinyl chloride, polyurethane, polyurethane elastomer, polyisoprene, polyamide, and polyamide elastomer. Examples thereof include polyimide, polytetrafluoroethylene, and silicone rubber. The balloon 22 is preferably composed of a polyamide elastomer, a urethane-based elastomer, or a polyester elastomer.

One end of the balloon 22 is adhered or fused to the tip of the outer tube 24. In other words, one end of the balloon 22 is adhered or fused to the vicinity of the base end side of the balloon lead-out hole 32a in the outer tube 24. The other end of the balloon 22 is adhered or fused and fixed to the tip of the outer surface of the inner tube 50. However, the other end of the balloon 22 may be adhered or fused to the tip of the inner surface of the inner tube 50.

The balloon 22 is pushed out toward the tip of the outer tube 24 through the balloon lead-out hole 32a by moving the inner tube 50 in the tip direction relative to the outer tube 24 (see FIGS. 5 to 7). The balloon 22 is formed so that the color of the inner surface of the balloon 22 is different from the color of the inner surface of the oviduct (for example, yellowish green). Thereby, it is possible to easily grasp whether or not the tip of the fallopian tube mirror 15 is located in the balloon 22.

The outer peripheral shape of the balloon 22 is formed in a circular shape. That is, the outer tube main body 30 has an inner peripheral shape that follows the outer peripheral shape of the balloon 22. A bag-shaped outer space S with a closed tip is formed between the balloon 22 and the outer tube main body 30. The inside of the balloon 22 opens toward the tip.

As shown in FIGS. 2 and 3B, the balloon catheter 10 further includes a rotation restricting unit 70 for restricting the relative rotation of the inner tube 50 and the outer tube hub 26. The rotation restricting portion 70 has a first engaging portion 72 provided on the outer pipe hub 26 and a second engaging portion 74 provided on the inner pipe 50. The first engaging portion 72 and the second engaging portion 74 engage with each other to regulate the relative rotation of the inner pipe 50 and the outer pipe hub 26.

In FIG. 3B, the first engaging portion 72 is a first insertion hole 36 formed in the outer pipe hub 26 and through which the inner pipe 50 is inserted. The first insertion hole 36 is formed in a non-circular shape when viewed from the axial direction. Specifically, the first insertion hole 36 is formed in a quadrangular shape when viewed from the axial direction.

In FIG. 2, the second engaging portion 74 is an annular contact portion 76 forming at least a part of the inner pipe 50. The annular contact portion 76 is provided on the proximal end side of the inner pipe 50. In the initial state of the balloon catheter 10 in which the inner tube 50 is most retracted with respect to the outer tube 24 (the state of the balloon catheter 10 shown in FIG. 2), the annular contact portion 76 inserts the first insertion hole 36 of the outer tube hub 26. It is inserted.

As shown in FIG. 3B, the annular contact portion 76 has an outer peripheral shape corresponding to the shape of the first insertion hole 36. That is, the annular contact portion 76 has a non-circular outer shape. Specifically, the annular contact portion 76 has a quadrangular outer shape. In other words, the annular contact portion 76 is formed in a square annular shape. The length of the diagonal line of the quadrangle of the annular contact portion 76 is longer than the length of each side of the quadrangle of the first insertion hole 36. That is, when the annular contact portion 76 rotates with respect to the outer tube hub 26, the annular contact portion 76 comes into contact with the wall surface forming the first insertion hole 36. The tip side 77 of the inner tube 50 with respect to the annular contact portion 76 is formed in an annular shape, for example, and can be inserted into the first lumen 30a of the outer tube main body 30. The outer peripheral surface of the annular contact portion 76 is formed in a tapered shape with respect to the outer peripheral surface of the tip side 77 of the inner pipe 50 with respect to the annular contact portion 76, so that the outer tube is smoothly connected without a step. As a result, the annular contact portion 76 can also be inserted into the first lumen 30a of the outer tube main body 30 in the process of operating the balloon 22.

Each of the shape of the first insertion hole 36 and the outer shape of the annular contact portion 76 may be, for example, a polygonal shape (other than a quadrangular shape), an elliptical shape, or the like. That is, if the relative rotation between the outer pipe hub 26 and the inner pipe 50 can be regulated by the annular contact portion 76 coming into contact with the wall surface forming the first insertion hole 36, the first insertion hole 36 and the annular contact The shape of the portion 76 can be changed as appropriate.

In the present embodiment, the outer shape of the annular contact portion 76 corresponds to the shape of the first insertion hole 36. However, the outer shape of the annular contact portion 76 does not have to correspond to the shape of the first insertion hole 36. That is, for example, the outer shape of the annular contact portion 76 may be formed in a quadrangular shape, and the first insertion hole 36 may be formed in an elliptical shape.

Next, a salpingoscopic tuboplasty using the balloon catheter 10 configured as described above will be described.

In tubuloscopic tuboplasty, as shown in FIG. 4, the operator (operator) inserts the balloon catheter 10 transcervically to the uterine cavity 200 and inserts the tip of the outer tube 24 into the fallopian tube 202. Bring it closer to the tubal opening 202a (insertion step). At this time, the operator confirms the fallopian tube opening 202a by the image of the fallopian tube mirror 15.

Subsequently, the balloon derivation step is performed. Specifically, the balloon operating fluid is supplied to the introduction port 38 (pressurization step). Then, the balloon operating fluid is supplied from the introduction port 38 to the outer space S of the balloon 22 via the first space 34 and the outer lumen 54. The balloon 22 is elastically deformed by being pressed inward in the radial direction by the balloon operating fluid supplied to the outer space S. That is, the portion of the balloon 22 located on the outer peripheral side of the fallopian tube mirror 15 is in close contact with the outer peripheral surface of the fallopian tube mirror 15. The inner surfaces of the balloon 22 located closer to the tip of the fallopian tube mirror 15 are in contact with each other.

After that, as shown in FIG. 5, the operator operates the inner pipe hub 52 with the fixing screw 28 loosened to advance the inner pipe 50 with respect to the outer pipe 24 (advance step). Then, the balloon 22 pushed toward the tip by the inner tube 50 advances with respect to the outer tube 24 together with the oviduct mirror 15 and is led out toward the tip of the outer tube 24 through the balloon lead-out hole 32a.

At this time, since one end of the balloon 22 is fixed to the tip of the outer tube 24, the balloon 22 moves forward while the tip of the balloon 22 is turned over. That is, the balloon 22 is turned up at its tip so that the inner surface faces outward. Therefore, the balloon 22 advances by a distance equivalent to half the advance distance of the oviduct mirror 15. The advancing step is performed until the tip of the fallopian tube mirror 15 reaches the tip of the balloon 22.

Further, in the advancing step, the inner pipe 50 advances with respect to the outer pipe hub 26 in a state where the annular contact portion 76 is inserted into the first insertion hole 36. Therefore, in the forward step, even when a rotational force in the circumferential direction is applied to the inner pipe hub 52 by the operator, the annular contact portion 76 comes into contact with the wall surface forming the first insertion hole 36, so that the inner pipe 50 Rotation with respect to the outer tube hub 26 (outer tube 24) is suppressed. Therefore, twisting of the balloon 22 is effectively suppressed.

Subsequently, the operator determines whether or not the balloon 22 has reached the lesion portion 204 based on the image of the salpingoscope 15. The operator may determine that the balloon 22 has reached the lesion portion 204 by pulling out all the balloons 22 forward. When the balloon 22 is located in front of the lesion portion 204, as shown in FIG. 6, the balloon operating fluid is depressurized and the perfusion fluid is supplied to the introduction port 62 (decompression step). Next, the operator retracts the fallopian tube mirror 15 by a predetermined distance (retraction step).

After that, the above-mentioned pressurizing step and advancing step are performed again. Then, as shown in FIG. 7, when the balloon 22 reaches the lesion portion 204, the lesion portion 204 is expanded by the balloon 22. That is, the stenosis or occlusion of the oviduct 202 is improved. At this time, a reaction force from the lesion 204 acts on the balloon 22. Therefore, the tip of the fallopian tube mirror 15 tends to bend together with the balloon 22.

However, the clearance CL is relatively small because the inner peripheral shape of the outer tube main body 30 follows the outer peripheral shape of the balloon 22. Therefore, it is possible to effectively prevent the fallopian tube mirror 15 and the balloon 22 from bending due to the reaction force. That is, the pushability of the balloon 22 is improved and the damage of the fallopian tube mirror 15 is suppressed.

After expanding the lesion 204, the operator removes the balloon catheter 10 (removal step). Before removing the balloon catheter 10, physiological saline is injected through the introduction port 62, then the fallopian tube mirror 15 is inserted, and the balloon catheter 10 is removed while observing the inside of the fallopian tube 202 with the fallopian tube mirror 15. You may. This completes the salpingoscopic tuboplasty.

In this case, the balloon catheter 10 according to the present embodiment has the following effects.

In the balloon catheter 10, the outer tube 24 has an inner peripheral shape that follows the outer peripheral shape of the balloon 22, the outer tube hub 26 is provided with a first engaging portion 72, and the inner tube 50 has a second engagement. A joint portion 74 is provided. The first engaging portion 72 and the second engaging portion 74 engage with each other to regulate the relative rotation of the outer pipe hub 26 and the inner pipe 50.

According to such a configuration, since the inner peripheral shape of the outer tube 24 follows the outer peripheral shape of the balloon 22, the gap (clearance CL) between the outer tube 24 (outer tube main body 30) and the balloon 22 is compared. Can be narrowed down. As a result, the deflection of the balloon 22 and the fallopian tube mirror 15 in the first lumen 30a of the outer tube 24 can be reduced. Therefore, with a simple configuration, the pushability of the balloon 22 can be improved and damage to the fallopian tube mirror 15 can be suppressed.

Further, the outer pipe 24 (outer pipe hub 26) and the inner pipe are formed by engaging the first engaging portion 72 provided on the outer pipe hub 26 and the second engaging portion 74 provided on the inner pipe 50 with each other. The rotation relative to 50 can be regulated. Therefore, the twisting of the balloon 22 can be suppressed.

The first engaging portion 72 is a first insertion hole 36 formed in the outer pipe hub 26 through which the inner pipe 50 is inserted, and the second engaging portion 74 is an annular contact forming at least a part of the inner pipe 50. Part 76. The first insertion hole 36 is formed in a non-circular shape when viewed from the axial direction of the inner pipe 50, and the annular contact portion 76 has a non-circular cross-sectional shape and a wall surface forming the first insertion hole 36. The relative rotation of the outer tube hub 26 and the inner tube 50 is regulated by contacting with.

According to such a configuration, the relative rotation of the outer pipe hub 26 and the inner pipe 50 can be regulated by a simple configuration.

The annular contact portion 76 has an outer peripheral shape corresponding to the shape of the first insertion hole 36.

According to such a configuration, the annular contact portion 76 can be efficiently brought into contact with the wall surface forming the first insertion hole 36.

The first insertion hole 36 is formed in a quadrangular shape when viewed from the axial direction of the inner pipe 50, and the annular contact portion 76 is formed in a quadrangular cross-sectional shape.

According to such a configuration, the relative rotation of the outer pipe hub 26 and the inner pipe 50 can be regulated by a simpler configuration.

The outer tube 24 has an outer tube body 30 which is a single lumen tube in which the first lumen 30a is formed.

According to such a configuration, since the wall thickness T of the outer tube main body 30 can be made substantially uniform in the circumferential direction, it is possible to suppress the change in flexibility depending on the bending direction of the outer tube main body 30. As a result, the kink resistance of the outer tube main body 30 can be improved (the outer tube main body 30 can be prevented from bending).

The wall thickness T of the outer tube main body 30 is 0.2 mm or more.

According to such a configuration, the kink resistance of the outer tube main body 30 can be further improved. Further, since the bending of the oviduct mirror 15 can be suppressed, the inner diameter of the outer tube main body 30 can be brought closer to the maximum outer diameter of the inner tube 50 (for example, the diagonal line of a square).

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

The above embodiments can be summarized as follows.

In the above embodiment, a flexible outer tube (24) and an inner tube (50) arranged in the inner tube (30a) of the outer tube so as to be movable in the axial direction with respect to the outer tube. The outer tube hub (26) provided at the base end of the outer tube, the tip of the outer tube and the tip of the inner tube are connected to each other, and an annular shape that swells inward in the radial direction of the outer tube. A balloon (22), and a medical wire rod (15) led out toward the tip of the outer tube together with the balloon while supporting the inflated balloon is inserted into the inside of the balloon. In the catheter (10), the outer tube has an inner peripheral shape that follows the outer peripheral shape of the balloon, and the outer tube hub is provided with a first engaging portion (72), and the inner tube is provided with a first engaging portion (72). Is provided with a second engaging portion (74), and the first engaging portion and the second engaging portion engage with each other to rotate the outer pipe hub and the inner pipe relative to each other. Discloses balloon catheters to regulate.

In the balloon catheter, the first engaging portion is an insertion hole (36) formed in the outer tube hub through which the inner tube is inserted, and the second engaging portion is at least one of the inner tubes. An annular contact portion (76) forming a portion, the insertion hole is formed in a non-circular shape when viewed from the axial direction of the inner pipe, and the annular contact portion is formed in a non-circular cross-sectional shape. In addition, the relative rotation of the outer tube hub and the inner tube may be restricted by contacting the wall surface forming the insertion hole.

In the above-mentioned balloon catheter, the annular contact portion may have an outer peripheral shape having a shape corresponding to the shape of the insertion hole.

In the above-mentioned balloon catheter, the insertion hole may be formed in a quadrangular shape when viewed from the axial direction of the inner tube, and the annular contact portion may be formed in a quadrangular cross-sectional shape.

In the above balloon catheter, the outer tube may have an outer tube body (30) which is a single lumen tube in which the lumen is formed.

In the above-mentioned balloon catheter, the inner peripheral shape of the outer tube body and the outer peripheral shape of the balloon may each have a circular shape.

In the above balloon catheter, the wall thickness (T) of the outer tube body may be 0.2 mm or more.

10 ... Balloon catheter 15 ... Fallopian tube mirror (medical wire)
22 ... Balloon 24 ... Outer tube 26 ... Outer tube hub 30 ... Outer tube body 30a ... First lumen (inner cavity) 50 ... Inner tube 50a ... Second lumen 70 ... Rotation control part 72 ... First engaging part 74 ... second engaging portion 76 ... annular contact portion

Claims (7)

A flexible outer tube, an inner tube arranged in the inner cavity of the outer tube so as to be movable in the axial direction with respect to the outer tube, and an outer tube provided at the base end of the outer tube. A tube hub, an annular balloon that connects the tip of the outer tube and the tip of the inner tube to each other and swells inward in the radial direction of the outer tube, and the inside of the balloon is inflated. A balloon catheter in which a medical wire led out toward the tip of the outer tube is inserted together with the balloon while supporting the balloon.
The outer tube has an inner peripheral shape that follows the outer peripheral shape of the balloon.
The outer tube hub is provided with a first engaging portion.
The inner pipe is provided with a second engaging portion and is provided with a second engaging portion.
A balloon catheter in which the first engaging portion and the second engaging portion engage with each other to regulate the relative rotation of the outer tube hub and the inner tube. The balloon catheter according to claim 1.
The first engaging portion is an insertion hole formed in the outer pipe hub through which the inner pipe is inserted.
The second engaging portion is an annular contact portion forming at least a part of the inner tube.
The insertion hole is formed in a non-circular shape when viewed from the axial direction of the inner pipe.
The annular contact portion is a balloon catheter that has a non-circular cross-sectional shape and regulates the relative rotation of the outer tube hub and the inner tube by contacting the wall surface forming the insertion hole. .. The balloon catheter according to claim 2.
The annular contact portion is a balloon catheter having an outer peripheral shape having a shape corresponding to the shape of the insertion hole. The balloon catheter according to claim 3.
The insertion hole is formed in a quadrangular shape when viewed from the axial direction of the inner pipe.
The annular contact portion is a balloon catheter having a quadrangular cross-sectional shape. The balloon catheter according to any one of claims 1 to 4.
The outer tube is a balloon catheter having an outer tube body which is a single lumen tube in which the lumen is formed. The balloon catheter according to claim 5.
A balloon catheter in which the inner peripheral shape of the outer tube body and the outer peripheral shape of the balloon are each circular. The balloon catheter according to claim 6.
A balloon catheter having a wall thickness of 0.2 mm or more for the outer tube body.

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