JP2563833Y2 - Balloon catheter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balloon catheter used in an endoscope used in the medical and industrial fields.

2. Description of the Related Art Conventionally, a thin-walled balloon portion is provided at a distal end portion or a middle portion of a catheter which is inserted into a body cavity or a lumen in a endoscopic manner in combination with a medical or industrial endoscope. Balloon tails provided with are widely used.

[0003] Japanese Patent Application Laid-Open No. 2-84863 discloses a medical balloon catheter having an air supply line for inflating a balloon inserted into a bile duct and a liquid supply line for supplying a contrast agent or the like. Has been proposed.

Conventionally, several methods have been proposed for smoothly inserting the balloon catheter into a small diameter portion in a body cavity or a lumen.

For example, Japanese Patent Publication No. 45-5239 and U.S. Pat.
In SP4782834, only the outer diameter of the catheter to which the balloon portion is attached is reduced in diameter, and the balloon is attached to the reduced diameter portion. Have been proposed which are almost the same.

In Japanese Utility Model Laid-Open Publication No. 63-88349, the outer diameter of the catheter behind the balloon portion is reduced in an appropriate range, and the outer diameter of the catheter closer to the hand than the reduced diameter portion is described. Is formed to have a larger diameter than the balloon portion.

Further, Japanese Patent Publication No. Sho 62-19871 proposes a technique in which the diameter of the entire catheter is reduced, and a balloon is adhered and fixed to the reduced-diameter catheter.

[0008]

However, a balloon catheter as disclosed in Japanese Patent Publication No. 45-5239 and US Pat. No. 4,782,834 has only a small outer diameter of the balloon portion on which the balloon is attached. Since the balloon portion on which the balloon is attached and the outer diameter of the catheter at the proximal side are formed to have substantially the same diameter, the flexibility of the catheter deteriorates, and the catheter is inserted into the curved portion of the endoscope which becomes curved. In addition, there has been a problem in the operation for raising the forceps.

In the balloon catheter disclosed in Japanese Utility Model Laid-Open Publication No. 63-88349, the problem of flexibility has been solved by reducing the outer diameter of the catheter behind the balloon portion to an appropriate range. When trying to aspirate water in the body cavity using the suction mechanism of the endoscope during surgery,
The problem that the outer diameter of the catheter on the proximal side is made larger than that of the balloon portion, so that the gap between the channel and the catheter is reduced when the catheter is inserted into the endoscope channel, and the suction force is reduced. And the friction with the inner wall of the channel of the endoscope is increased, so that the catheter cannot be smoothly moved forward and backward.

Furthermore, the balloon catheter as shown <br/> in JP-B-62-19871, clearance problems between the channel and the catheter to the smaller diameter over a catheter entire length but is solved, the catheter By reducing the diameter of the tube, the air-supply / liquid-supply pipe in the catheter also becomes thinner, resulting in a problem that the pipe resistance increases and sufficient air-supply / liquid supply cannot be performed. At the same time, the catheter may be buckled during insertion due to weak elasticity.

[0011] The present invention has been made in view of the above circumstances, without reducing the air and liquid supply capacity in the catheter,
It is an object of the present invention to provide a balloon catheter that improves the penetrability into an endoscope channel, a body cavity, and the like, and that does not decrease the suction ability using the endoscope channel.

[0012]

SUMMARY OF THE INVENTION A balloon catheter according to the present invention has an opening near the distal end of a catheter that can be inserted into an endoscope channel, and the opening is inserted through the inside of the catheter in the axial direction. At least one liquid feeding conduit communicating with the catheter, and an opening near the distal end of the catheter, and at least one balloon inflating and contracting that is inserted through the inside of the catheter in the axial direction and communicates with the opening. The conduit and the distal end of the catheter are thinner than the proximal side.
A reduced diameter portion and at least one balloon portion which covers the opening of the balloon inflation / contraction channel and is hermetically provided on the outer periphery of the small diameter portion closer to the hand than the tip of the catheter. Wherein the outer diameter of the balloon portion provided on the distal end side of the balloon catheter is formed larger than the outer diameters of the catheters on the distal end side and the proximal side of the balloon portion.

[0013]

With this configuration, the balloon portion provided on the distal end side of the balloon catheter has the maximum outer diameter.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 3 relate to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view illustrating an insertion portion of a balloon catheter, and FIG.
Is an explanatory view showing a schematic configuration of a balloon catheter, and FIG. 3 is a cross-sectional view illustrating a state where the balloon catheter is inserted into a channel.

[0015] As shown in FIG.
Is an elongated and flexible insertion portion 2 that is inserted into a body cavity.
Is formed by a small-diameter portion 3 and a large-diameter portion 4, and a balloon portion 5 on which an inflatable balloon is attached is provided on the outer peripheral surface on the distal end side of the small-diameter portion 3. A branch portion 6 is provided on the proximal side of the insertion portion 2 to penetrate the balloon catheter 1 and branch a balloon inflation / contraction line, which will be described later, and a liquid sending line. Behind the branch part 6,
A balloon branch pipe 7 connected to a balloon inflation / contraction pipe line (not shown) and a liquid feed branch pipe 8 connected to a liquid feed pipe line (not shown) are provided at an appropriate angle with respect to the pipe axis direction. Further, an air supply mouthpiece 9 is provided at the rear end of the balloon branch pipe 7, and the air supply mouthpiece 9 is provided with a cock 10 for temporarily stopping the escape of air into the balloon portion 5. Thus, an injection cylinder 11 for air supply is attached. Also, at the rear end of the liquid sending branch pipe 8,
A liquid feeding base 12 for attaching a liquid sending means is provided.

The insertion portion of the balloon catheter 1 will be described with reference to FIG. As shown in the figure, the insertion portion 2 of the balloon catheter 1 is formed by a small diameter portion 3 on the distal end side and a large diameter portion 4 connected to the small diameter portion 3. And inside the balloon catheter 1,
A liquid feed pipe 15 which is inserted in the axial direction and communicates with the opening 15a at the distal end of the small-diameter portion 3, and a balloon inflation and contraction pipe 16 which is inserted in the axial direction and communicates with the opening 16a on the side surface of the distal end. Are provided. In the opening 16a communicating with the balloon inflation / contraction line 16, a cylindrically-sealed balloon that covers the opening 16a substantially at the center is formed on the outer peripheral surface of the small-diameter portion 3. Thus, a balloon portion 5 is formed.

That is, the balloon catheter 1 comprises:
The balloon branch pipe 7 communicating with the opening 16a of the balloon portion 5 and communicating with the balloon inflation / contraction conduit 16
The balloon section 5 can be inflated and deflated by manipulating the injection cylinder 11 connected to the liquid supply channel, while communicating with the opening 15a at the distal end of the balloon catheter 1 and communicating with the liquid supply pipe line 15. Liquid feeding mouth 12 of tube 8
The liquid can be supplied into the body cavity or the like from the opening 15a at the distal end by using a liquid supply means (not shown) connected to the device. The syringe 11 and the balloon branch tube 7
By operating the cock 10 disposed between the balloon portion 5 and the air outlet, the air escaping into the balloon portion 5 can be temporarily stopped.

For example, the balloon catheter 1 to be inserted into the channel of the endoscope and introduced into the subject to be inspected can be smoothly inserted even when the curved portion of the endoscope is curved. In order to form a small-diameter portion 3 in which the distal end side of the insertion portion 2 of the balloon catheter 1 has a small diameter, the proximal portion of the insertion portion has a small diameter so as to be hardly broken at the time of insertion / removal and buckling. It is formed as a large diameter portion 4 which is larger than the diameter outside diameter. The outer diameter of the large diameter portion 4 is formed smaller than the outer diameter of the balloon portion 5 attached to the small diameter portion 3 in order to reduce the frictional resistance with the channel of the endoscope. .

Therefore, the outer diameters of the small diameter portion 3, the large diameter portion 4, and the balloon portion 5 constituting the balloon catheter 1 are as follows.
The outer diameter of the small diameter portion 3 is d1 and the outer diameter of the large diameter portion 4 is d2.
When the outside diameter of the balloon portion 5 attached to the small diameter portion 3 is d3, the outside diameter d1 of the small diameter portion 3 is made the smallest, and the outside diameter d2 of the large diameter portion 4 is sequentially reduced. It is formed thicker as the outer diameter dimension d3 of the portion 5 becomes.

The operation of the balloon catheter 1 will now be described. The balloon catheter 1 configured as described above is inserted into a body cavity through a channel 21 of an endoscope inserted into the body cavity, for example, as shown in FIG. And it is to be introduced into the bile duct from the duodenal papilla. The balloon portion 5 introduced into the bile duct is inserted into the syringe 11 with the cock 10 opened.
By operating, the balloon 5 can be inflated to a predetermined shape. Since the balloon 5 can hold the balloon 5 in an inflated state by closing the cock 10, the incision of the duodenal papilla is in a closed state,
In this closed state, a contrast medium is injected into the bile duct from a liquid supply device (not shown) connected to the liquid supply mouthpiece 12 so that the contrast medium can be imaged without leaking from the duodenal incision. Is

In order to discharge bile mud and gallstones in the bile duct, after inserting the balloon portion 5 of the balloon catheter 1 to the inside of the bile duct, the balloon portion 5 is inflated and the balloon is moved to the proximal side. By pulling back the part 5, the bile mud and gallstone can be drawn out to the duodenum side and discharged out of the body.

Further, in the process of inserting the balloon catheter 1 into a bile duct, performing angiography, discharging gallstones, and the like, a liquid or a bubble in a body cavity is passed through a channel 21 in order to secure a visual field of an endoscope. It can be sucked through .

As described above, the balloon catheter 1
When the balloon portion 5 is inserted into the body cavity, the balloon portion 5 having the largest diameter is provided on the most distal end side. Everything can be inserted smoothly.

The large-diameter portion 4 forming the proximal side of the balloon catheter 1 is not only resistant to breakage and buckling, but also has a smaller diameter than the balloon portion 5 as described above. Since the small-diameter portion 3 having a more distal end than the large-diameter portion 4 has sufficient flexibility, it can be easily inserted into the curved portion of the curved endoscope. .

Further, when a liquid or a bubble in a body cavity is sucked by using the channel 21 of the endoscope, the large diameter portion 4 is formed to have a smaller diameter than the balloon portion 5 so that the channel 21 and the large diameter portion 4 are thickened. Since a sufficient gap with the diameter portion 4 can be ensured, bubbles and the like can be sucked without lowering the suction ability.

When crushing stones using a laser or an electrohydraulic shock wave probe, the configuration of the balloon catheter may be as follows. FIG. 7 is an explanatory sectional view showing a schematic configuration of a balloon catheter used when crushing stones, and FIG. 8 is a front view of a balloon catheter used when crushing stones.

As shown in FIG. 8, the balloon catheter 1
There is a deviation a between the central axis of the treatment tool through hole 22 and the central axis of the treatment tool through hole 22 through which the laser or the like is inserted. As a result, the field of view when observing with a scope inserted, for example, is offset in one direction, so that a uniform field of view cannot be obtained. Therefore, as shown in FIGS. 7 and 8, the balloon portion 5 attached to the small-diameter portion 3 on the distal end side of the balloon catheter 1 is provided with a treatment tool through which a laser or the like is inserted when the balloon portion 5 expands. The hole 22 is formed so as to be inflated so that the center axis of the hole 22 becomes the center of the balloon portion 5. Since the central axis of the treatment tool through hole 22 is formed so as to be the center of the balloon portion 5 when inflated, a uniform field of view can be obtained when the scope is inserted into the treatment tool through hole 22. In addition to this, when irradiating a laser or the like, the laser can be efficiently radiated to a target portion.

FIGS. 4 and 5 relate to a second embodiment of the present invention. FIG. 4 is a sectional view for explaining an insertion portion of a double balloon catheter, and FIG. 5 is an explanatory view showing a schematic structure of the double balloon catheter.

As shown in FIG. 5, the double balloon catheter 31 of the present embodiment has an elongated and flexible insertion portion 32 inserted into a body cavity, which is formed by a small diameter portion 33 and a large diameter portion 34. A first balloon portion 35 having an inflatable balloon attached to the outer peripheral surface on the distal end portion side of the small-diameter portion 33.
a and a second balloon portion 35b. Further, the proximal side of the insertion portion 32, a branch unit 36 for branching the two balloons deflated conduit and one and feeding conduit you through the double balloon catheter 31 is provided. Behind the branch portion 36, a first balloon branch tube 37a connected to each balloon inflation / contraction line.
And a second balloon branch pipe 37b and a liquid feed branch pipe 38 connected to the liquid feed pipe are provided at an appropriate angle with respect to the pipe axis direction. The balloon branch pipes 37a, which communicate with the balloon inflation / contraction pipes,
Air supply mouthpieces 39a and 39b are provided at the rear end of the air supply mouth 37b.
Air supply syringe 4 via cocks 40a and 40b for temporarily stopping the escape of air into 5a, 35b.
1a and 41b are attached. At the rear end of the liquid feed branch pipe 38, a liquid feed base 42 for attaching a liquid feed means is provided.

The insertion portion 32 of the double balloon catheter 31 will be described with reference to FIG. As shown in the figure, the insertion portion 32 of the balloon catheter 31 is constituted by a small-diameter portion 33 on the distal end side and a large-diameter portion 34 connected to the small-diameter portion 33. The inside of the double balloon catheter 31 has two balloon inflation and contraction conduits (not shown) that are inserted in the axial direction and communicate with the openings on the side surfaces of the distal end portion. And a liquid feed pipe (not shown) communicating with the opening 46 provided between the liquid supply section and the liquid supply section. At the openings communicating with the respective balloon inflation / contraction pipes, a cylindrically-sealed balloon formed so as to cover the opening as a substantially central portion and adhere to the outer peripheral surface of the small-diameter portion. A first balloon portion 35a and a second balloon portion 35b are formed.

That is, the balloon portion 35a is operated by operating the injection cylinder 41a connected to the balloon branch tube 37a communicating with the opening of the balloon portion 35a and communicating with the balloon inflation / contraction line. 35
a can be inflated and deflated, and the balloon 35
b is a balloon branch pipe 37b communicating with the opening of the balloon section 35b and communicating with the balloon inflation / contraction pipe.
The balloon portion 35b can be expanded and contracted by operating the injection cylinder 41b connected to. on the other hand,
A liquid supply unit (not shown) connected to the liquid supply port of the liquid supply branch pipe 38 communicating with the opening 46 between the first balloon part 35a and the second balloon part 35b and communicating with the liquid supply conduit. It can be used to feed liquid into a body cavity or the like.

The double balloon catheter 31
The outer diameters of the small diameter portion 33, the large diameter portion 34, the first balloon portion 35a and the second balloon portion 35b are the following. Dimension d2
, The first balloon portion 35a attached to the small diameter portion 33
When the outer diameter of the small diameter portion 33 is d3 'and the outer diameter of the proximal second balloon portion 35b attached to the small diameter portion 33 is d3', the outer diameter d1 of the small diameter portion 33 is made the smallest. , Sequentially second
The outer diameter d3 'of the balloon portion 35b, the outer diameter d2 of the large diameter portion 34, and the outer diameter d3 of the first balloon portion 35a become larger. Other configurations are the same as in the first embodiment.

With this configuration, for example,
Since the front and back of the gall bladder are shielded by the first balloon 35a and the second balloon 35b, the gall bladder and the gall bladder are efficiently operated by the contrast medium injected by the liquid feeding means without leaking the contrast medium to other parts. You will be able to image well. Other functions and effects are the same as those of the first embodiment.

FIG. 6 is a sectional view illustrating an insertion portion of a balloon catheter according to a third embodiment of the present invention.

The double balloon catheter 31 of the present embodiment
In the second embodiment, the outer diameter d1 of the small diameter portion 33 is made the thinnest, the outer diameter d3 'of the second balloon portion 35b, the outer diameter d2 of the large diameter portion 34, and the first balloon portion are sequentially reduced. The outer diameter of the double balloon catheter 31, which is made thicker as the outer diameter d3 becomes 35a, is reduced to the outer diameter d1 of the small diameter portion 33, and the outer diameter d2,
The outer diameter d3 'of the second balloon portion 35b and the outer diameter d3 of the first balloon portion 35a become larger as they become larger. Other configurations and actions / effects are second
This is the same as the embodiment. In the embodiment, the first balloon unit is used.
The outer diameter of 35a is larger than the outer diameter of the second balloon portion 35b.
But the relationship between the outer diameters of the two balloons is opposite.
There may be.

[0036]

As described above, the balloon catheter according to the present invention can improve the penetration into the endoscope channel or the body cavity without reducing the air and liquid supply capacity in the catheter, and can also improve the inner catheter. There is an effect that the suction ability using the channel of the endoscope is not reduced.

[Brief description of the drawings]

FIGS. 1 and 3 relate to a first embodiment of the present invention, and FIG. 1 is a cross-sectional view illustrating an insertion portion of a balloon catheter.

FIG. 2 is an explanatory diagram showing a schematic configuration of a balloon catheter.

FIG. 3 is a cross-sectional view illustrating a state in which a balloon catheter is inserted into a channel.

4 and 5 relate to a second embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating an insertion portion of a double balloon catheter.

FIG. 5 is an explanatory view showing a schematic configuration of a double balloon catheter.

FIG. 6 is a sectional view illustrating an insertion portion of a balloon catheter according to a third embodiment of the present invention.

7 and 8 show a balloon catheter when crushing stones, and FIG. 8 is an explanatory sectional view showing a schematic configuration of a distal end portion of the balloon catheter.

FIG. 8 is a front view of a balloon catheter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Balloon catheter 2 ... Insertion part 3 ... Narrow diameter part 4 ... Thick diameter part 5 ... Balloon part 15 ... Liquid sending pipeline 16 ... Balloon expansion / contraction pipeline

Claims (1)

(57) [Scope of request for utility model registration] At least one liquid feeding conduit having an opening near a distal end portion of a catheter insertable into an endoscope channel and penetrating the inside of the catheter in an axial direction and communicating with the opening. Having an opening near the distal end of the catheter,
At least one balloon inflation / contraction line that is inserted through the inside of the catheter in the axial direction and communicates with the opening, a small-diameter portion in which the distal end side of the catheter is narrower than the proximal side, and the balloon inflation / contraction line At least one balloon portion which covers the opening of the catheter and is hermetically provided on the outer periphery of the small-diameter portion closer to the hand than the tip of the catheter.A balloon catheter comprising: a balloon provided on the tip side of the balloon catheter. A balloon catheter, wherein the outer diameter of the portion is formed larger than the outer diameters of the catheter on the distal end side and the proximal side of the balloon portion.