JPS6051913B2 - balloon catheter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a balloon catheter, and more particularly, to a balloon catheter for removing foreign matter in bile ducts, such as bile sludge and gallstones.

A conventional balloon catheter was constructed as shown in FIG.

That is, the balloon catheter 1 has both ends 3a of a cylindrical balloon 3 on the outer peripheral surface of the distal end of the catheter body 2, which is a tubular body.
3b is airtightly fixed to both ends 3 of the balloon 3.
An opening 4 of an air supply hole 4 is provided on the outer peripheral surface of the main body 2 between a and 3b.
A is provided. The air supply hole 4 is formed in the main body 2 along the tube wall in the tube axis direction, and its base end (not shown) is connected to an air supply pipe of a known air supply device.

The conventional balloon catheter 1 configured in this way is
The balloon 3 is inflated as shown by the dotted line 3' by sending air or waves, and is fixed by pressing against the inner wall of the body cavity, blocking the inside of the body cavity in front and behind the balloon 3, and draining the body cavity fluid through the catheter hole 5. It has become possible to collect samples by suctioning or injecting medicinal solutions.

Further, such a balloon catheter 1 is also applied, for example, to remove bile sludge or gallstones in the bile duct, but in this case, the balloon 3 has an inflated shape of a sphere or a spindle-like shape that is elongated in one diameter direction. In order to obtain the desired shape, it is only necessary to press the sludge and gallstones in the direction of the outer circumference, and it is extremely difficult to pull them out. Therefore, when air is injected into the balloon,
If the balloon is formed to inflate optimally for extraction, fold-like wrinkles will form when the balloon is evacuated, making insertion difficult and the above-mentioned drawbacks unresolved.

In addition, a device for collecting foreign matter in the body cavity includes an adsorption member at the tip of the catheter, and a device for collecting foreign matter in the body cavity by passing this into the channel of the endoscope (see Utility Model Application No. 52-243).
However, if a suction member with an outer diameter much larger than the outer diameter of the catheter is provided at the tip of the catheter in this way, it is difficult to insert it from the proximal end of the endoscope channel to the tip. is actually extremely difficult and has operational problems.

In view of the above-mentioned points, an object of the present invention is to form a catheter body of a balloon catheter with a double tube including an inner tube and an outer tube, and have both inner and outer tubes fit into each other so as to be able to move forward and backward in the tube axis direction. When inserting a balloon catheter into a thin tube in a body cavity by fixing both ends of the balloon to each tip, pull the double tubes apart to insert the balloon along the outer circumferential surface of the tube. After insertion, the tips of both tubes are brought close to each other, and the balloon is inflated into the desired shape by air to remove any foreign matter in the thin tube. To provide an extremely convenient balloon catheter that can be reliably and easily extracted.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 2 is a sectional view showing the distal end of a balloon catheter according to an embodiment of the present invention.

As shown in the figure, the balloon catheter according to the present invention has a catheter main body made up of a double tube consisting of an outer tube 12 and an inner tube 13 fitted into the outer tube 12 so as to be able to move forward and backward in the tube axis direction. It is made up of the body. The balloon 14, which is inflated into a predetermined shape by air supply, has its front and rear ends 14a.
, 14b are airtightly attached to the outer peripheral surfaces of the tips of the outer tube 12 and inner tube 13, respectively. It is fixed and attached. Further, the distal end of the inner tube 13 slightly protrudes from the distal end of the outer tube 12. Inside the tube wall of the inner tube 13, a hole is formed in the tube axis direction, and the tip of the outer circumferential surface near the tip is open, and the other end!
A balloon air supply hole 15 is provided which opens at the base of the balloon.
A well-known air supply device (not shown) is adapted to be connected.

In addition to using the hole 16 of the inner tube 13 as a passageway for discharging gas, liquid, etc. from the body cavity by suction or injecting gas or liquid into the body cavity, as in the conventional case, In the present invention, the shape is suitably formed so that forceps can be inserted therethrough and a foreign object in a body cavity can be treated with the forceps. Next, the operation of the balloon catheter ±± according to the present invention will be described. When inserting a balloon catheter into a narrow tube such as a bile duct, as shown in FIG. 3, the outer tube 12 is pulled in the direction of arrow a relative to the inner tube 13 to stretch the balloon 14. In this way, the balloon 14 has an outer diameter approximately equal to the outer diameter of the outer tube 12.
``Since the balloon catheter has a cylindrical shape with the same outer diameter, it is extremely easy to insert the balloon catheter into the thin tube. nine
Next, while placing the tip of the balloon catheter at a desired position within the thin tube and inserting only the outer tube 12,
When air or liquid is supplied into the balloon 14 through the air supply hole 15, the balloon 14 is inflated into a predetermined shape as shown in FIG.

7 balloon 14 has an inflated shape, for example, the 4th balloon 14,
As shown in Figure 5, many types of hats, such as hat-shaped hats and inverted hat-shaped hats, are prepared, and the most suitable one is used depending on the purpose.

FIG. 4 shows how to remove bile sludge 19 and gallstones 20 within the bile duct 18 using a vanolune catheter to which a hat-shaped balloon 14A is fixed.
If the catheter is pulled out in the direction of arrow b from the state shown in the figure, the bile sludge 19 adhering to the inner wall of the bile duct 18 will be scraped off by the periphery of the balloon 14A, and the gallstones 20 will be removed. The bile duct is trapped in the bile duct 18 and is properly captured and removed outside the bile duct 18.

FIG. 5 shows an example of removing a foreign object 22 from a narrow tube 21 at the entrance of a body cavity using a balloon catheter to which an inverted hat-shaped balloon 14B is fixed.

That is, in the past, when a foreign body such as a polyp was excised with forceps or the like under observation with an endoscope, the foreign body 22 would be compressed by a small part of the esophagus or anus and would be dropped. This is an example of extraction in such a case. In this case, when the foreign object 22 is suctioned by inhaling air through the hole 16 of the inner tube 13 and the balloon catheter is pulled out in the direction of arrow c, the inverted hat-shaped balloon 1 is pulled out.
The foreign object 22 is trapped by the bosom of the tube 4B and exits through the narrow entrance of the thin tube 21. At this time, the pressure force of the pinched portion is received by the balloon 14B and the balloon slides out to the outside, so that it will not be pulled to the entrance or left behind at the entrance, and the foreign object 22 will be easily removed.
can be extracted outside the tubule 21. Further, even when foreign objects other than polyps, such as fish bones, are pulled out from the esophagus, they can be safely pulled out without damaging the mucous membrane. In contrast to the example shown in FIG. 5, in which the foreign object 22 was held by suction, FIG. An example of inserting the foreign object 25 through the thin tube 21, gripping the foreign object 25 with the gripping member 24 of the forceps 23, and removing it from the thin tube 21 in the same manner as in FIG. 5 is shown.

As the forceps 23, for example, a forceps device previously proposed by the present applicant (Japanese Utility Model Application No. 50-106986) is used.

This forceps device has a gripping member 24 attached to the tip via a pair of links, and the gripping member 24 is opened and closed by an operation wire (not shown) connected to the links. It is something. By inserting such forceps 23 into the hole 16 of the inner tube 15 of the catheter, the foreign object 25 can be grasped by the gripping member 24 and removed from the outside of the thin tube 21 as in the case of FIG. In addition, polyps (not shown) protruding into the tubules can be pinched and removed. In each of the above embodiments, the balloon catheter was inserted directly into a thin tube inside the body cavity, but since the thin tube usually branches from the deep part of a large diameter body cavity tube, It is extremely difficult to directly insert a balloon catheter from outside the body cavity.

In consideration of the above points, the balloon catheter of the present invention has both the inner and outer tubes of the catheter body made of rigid and flexible materials, and is inserted into the forceps channel of the endoscope to perform the above-mentioned extraction operation. It is made so that it can be done.

Next, an example of inserting the balloon catheter of the present invention into the forceps channel of an endoscope and extracting a foreign object in a thin tube that opens deep into a body cavity under direct vision of the endoscope will be explained with reference to FIG. do.

FIG. 7 is a schematic diagram showing a state in which the balloon catheter of the present invention is inserted into the forceps channel of a side-viewing endoscope, and its distal end is inserted into a thin tube in a body cavity. The well-known observation optical system members, illumination optical system members, light source device, etc. are all omitted. In the figure, a side bow type endoscope 41 having a forceps channel 43 has an outlet 43a of the forceps channel 43 opening in a direction perpendicular to a face at its distal end, as is well known.

The entrance 43b of the forceps channel 43 opens at the distal end surface of the forceps insertion section 42 provided on one side of the operation base 41b of the endoscope 41. Therefore, the balloon catheter 51 of the present invention inserted into the forceps channel 43 has flexibility corresponding to the curvature of the channel 43. At the base 51b of the balloon catheter 51,
An air supply vibrator 53 of a balloon air supply device (not shown) is connected thereto, and the distal end of the base 51b serves as an operating section 54 of the balloon catheter. The distal end portion 51a of the balloon catheter is constructed in the same manner as shown in FIG. 2, and is inserted into a thin tube 62 branching from the body cavity 61 in the state shown in FIG. 3. Note that the forceps channel 4 of the distal end portion 41a of the side-viewing endoscope 41
In the vicinity of the outlet 43a of No. 3, a well-known observation window (not shown) and an illumination window (not shown) are arranged facing the protruding direction of the balloon catheter, and the illumination is provided through the windows. Light is projected, and the vicinity of the opening of the thin tube 62 is observed by the illumination through the eyepiece 44 of the base 41b. After the distal end of the balloon catheter 51 is inserted into the thin tube 62 in this manner, the foreign matter inside the thin tube 62 is removed by the same method as in the case of FIGS. 4 to 6 above.
Note that the balloon air supply hole 15 of the catheter in the above embodiment has both inner and outer tubes 12 and 13, as shown in FIG.
It is also possible to utilize the gap 17 between the two and use it as the feed hole 15.

In this way, it is not necessary to provide the air supply hole 15 in the wall of the inner tube 13, so that the inner tube 13 and the outer tube are
2 can be made small in diameter, the entire catheter body can be made small in diameter, and added cost can also be reduced. As explained above, according to the present invention, for example, bile sludge and gallstones in the bile duct, which have been extremely difficult to remove, can be removed extremely easily, and the intended purpose is successfully achieved.

10 Brief Description of the Drawings FIG. 1 is a sectional view showing an example of the tip of a conventional balloon catheter, FIG. 2 is a sectional view of the tip of a balloon catheter showing an embodiment of the present invention, and FIG. is an operational view of the balloon catheter shown in Fig. 2 above, Figs. 4 to 6 are cross-sectional views showing the balloon catheter shown in Fig. 2 above in use, and Fig. 7 is a diagram showing the use of the balloon catheter in conjunction with a side-viewing endoscope. FIG. 8 is a sectional view of the distal end of a balloon catheter showing another embodiment of the present invention.

±, dan, 51... Balloon catheter, 12.
・Outer tube, 13...Inner tube, 14, 14A, 14B・
... Balloon, 15 ... Air supply (liquid supply) hole, 1
6...Inner canal hole, 41...Endoscope.

Claims (1)

[Scope of Claims] 1. Both inner and outer tubes that can move forward and backward in the axial direction of the tubes, one end of which is attached to the distal end of the inner tube that protrudes from the outer tube, and the other end of which is attached to the outer tube. The balloon is airtightly fixed to the tip of the balloon, and the balloon is provided between the two tubes or in the wall of one of the inner and outer tubes, and is used to supply air (liquid) to inflate the balloon. A balloon catheter consisting of a balloon air supply hole. 2. The balloon catheter according to claim 1, wherein both the inner and outer tubes are formed of flexible tubes and are used by being inserted into a forceps channel of an endoscope. 3. Claim 1, wherein the inner tube is a channel for passing forceps for treating an affected area in a body cavity.
Balloon catheter as described in section. 4. The balloon catheter according to claim 1, wherein the balloon is formed into a predetermined shape by supplying air thereto.