JPH0354722Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to the tip of an insertion member such as a cannula which is inserted into a body cavity etc. through an endoscope and is retained in the body cavity. This invention relates to an indwelling balloon that is attached to the body.

[Prior Art] An insertion member such as a cannula is inserted through an endoscope, passes through a narrowed part inside a body cavity, and then introduces its tip into an affected area or a part to be inspected or observed. It is used to guide a special endoscope for treatment and observation of the affected area, and to secure a passage for injecting medicinal solutions into the affected area. In order to securely hold the insertion member in a predetermined site, a balloon is attached to the tip of the insertion member, and the balloon is inflated by supplying pressurized fluid such as pressurized air or liquid, thereby reducing the stenosis. Devices configured to hold the device so that it does not deviate from the section have been known in the past.

[Problems to be solved by the invention] By the way, in the prior art described above, since the balloon is inflated uniformly, the body cavity into which the balloon is inserted contracts, causing the balloon to inflate uniformly. When the tube is compressed, it may be pushed out of the indwelling site by a reaction force based on the internal fluid pressure, causing the inconvenience that it may deviate from the stenosis.

Therefore, the present applicant arranged a linear elastic material so as to bridge the base and the tip of the balloon, and when the balloon was inflated, the resistance force of the linear elastic material was utilized. We proposed a balloon for indwelling in the body that can be deformed and expanded so that it expands partially. If the balloon is deformed and inflated in this way, even if the inside of the body cavity into which it is inserted contracts and the balloon is compressed, the fluid pressure reaction force will be concentrated on this bulging part, and the balloon will be compressed. Although such a configuration is extremely convenient, it acts to further bulge the protruding portion and reliably prevents the insertion member from deviating from the indwelling position. If this is adopted, the following problems will arise.

That is, with the balloon inflated within the body cavity,
When a tensile force is applied to the insertion member, the greatly bulged side at the base of the balloon stretches the most;
This may cause the balloon to burst. In particular, as mentioned above, when a linear elastic material is provided inside the balloon, a large bending force is applied to the base of the balloon when inserting the insertion member into a body cavity, causing the balloon to bend easily when inserted into the body cavity. Since the strength is comparatively reduced, there is a disadvantage that the risk of rupture mentioned above is considerably increased.

The present invention has been developed in view of the above points, and its purpose is to provide a balloon for indwelling in the body that can effectively protect the base of the inflated and inflated body. .

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has an inflatable body portion made of an elastic membrane member that can be expanded and contracted, and the inflatable body portion is removed from a cannula or the like. It is attached to the tip of an insertion member that is inserted into a predetermined affected area or observation target area through a constricted part of a body cavity, etc., and the expansion and contraction body part is inflated by pressurized fluid sent through the insertion member. The device can be placed inside a body cavity or the like by causing the inflatable body portion to become a deformed, inflatable inflatable body portion that expands partially when pressurized fluid is supplied thereto. , and is characterized in that an elastic protection portion is provided at the connecting portion of the deformed, inflatable, and deflated body to the insertion member to protect the root portion of the deformed and inflated body from bursting. It is something.

[Function] In this way, by deforming and bulging the inflatable body part so that a part of it bulges out greatly, it is possible to improve the indwelling property in the body, and also to prevent the deformation and bulge as described above. In the case where
A protective part made of an elastic member is provided at the root of the deformed, bulging, expanding and contracting body, which prevents the bulging side of the root from being locally stretched significantly and increasing stress. , it becomes possible to prevent inconveniences such as the expansion and contraction body section bursting.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIGS. 1 and 2 are diagrams showing how the cannula 2 is used as an insertion member equipped with a balloon 1 for indwelling in the body. As shown in the figure,
This cannula 2 is used together with a side-viewing duodenal endoscope 3, and the cannula 2 has a length more than twice as long as the insertion portion 3a of the endoscope 3. And, as shown in Figure 1,
With the insertion section 3a of the endoscope 3 inserted from the oral cavity M into the duodenum D of the patient P, the cannula 2 is inserted through the treatment instrument insertion port 4 provided in the operation section main body 3b of the endoscope 3. The treatment instrument is inserted into a predetermined affected area 7 through a stenosis path 6 from a treatment instrument lead-out portion 5 formed at the distal end of the insertion portion 3a.
In this state, the endoscope 3 is removed from the body cavity by inflating the balloon 1 as will be described later, thereby holding it so that it does not escape from the affected area 7. As a result, the balloon 1 at the distal end of the cannula 2 is placed in the affected area 7.

Therefore, by removing the aforementioned side-viewing endoscope 3 from the cannula 2 and inserting a direct-viewing endoscope into the cannula 2, this endoscope can be inserted into the affected area 7. I can do it. In other words, cannula 2 can be used as a guide even in areas where it is difficult to insert a direct-view biliary endoscope under normal conditions, such as the bile duct that opens at a large angle to the duodenum. By doing so, the biliary endoscope can be inserted smoothly.

As described above, the cannula 2 is used as a guide for an endoscope, and therefore, the distal end of the cannula 2 must be placed in the affected area 7 in an extremely stable state. For this purpose, the cannula 2 is formed entirely of a hollow flexible tube 10, as shown in FIG. A syringe 11 that pumps pressurized air into the balloon 1 from an air passage 10a formed in the flexible tube 10.
A syringe mounting part 12 for mounting the syringe is formed.

Next, the balloon 1, as shown in FIG.
It has an expanding and contracting body part 13 that can be deformed and expanded by forming an elastic membrane member made of silicone rubber or the like into a tube shape,
A relatively thick protective tube 14 similarly made of an elastic material such as silicone rubber is fixed to the inner surface of the proximal end of the inflatable body part 13 by means of adhesive or the like. The protective tube 14 is attached to a connecting ring 15 that is removably screwed onto the tip of the cannula 2, and is fixed with a winding thread 16 so that the inside is airtight. Here, the protective tube 14 is in a state of extending forward from the tip of the connecting ring 15 by a predetermined length. Further, the distal end portion of the inflatable body portion 13 is fitted into the distal end cap 17 and fixed in an airtight state by a winding thread 18. Between the connecting ring 15 and the tip cap 17, an inflatable body portion 1 is provided.
When pressurized air is supplied to 3, the expansion and contraction body part 13
A coil spring 19 is provided as a core material for deforming and expanding the coil spring 19, and both ends of the coil spring 19 are connected to soldering openings 15a and 17 formed in the connecting ring 15 and the tip cap 17, respectively.
It is fixed by soldering to a.

This embodiment is constructed as described above, and its operation will be explained next.

First, as shown in FIG. 1, the insertion section 3a of the side-viewing endoscope 3 is inserted into the duodenum D of the patient P through the oral cavity M. Then, the cannula 2 is inserted through the treatment instrument insertion port 4, and the treatment instrument is led out, with the balloon 1 for indwelling in the body provided at the distal end of the cannula 2 formed at the distal end of the insertion section 3a in a direction substantially perpendicular to its axis. It is made to protrude from the portion 5 and inserted into the stricture path 6 which opens at a large angle to the duodenum D. Here, since the coil spring 19 is attached to the inside of the balloon 1 and has a certain degree of stiffness, the expansion and contraction body portion of the balloon 1
Even if the guide and narrowing path 6 in the insertion section 3a are formed thin in order to facilitate the expansion of the guide and the narrowing path 6,
This improves the operability of insertion. In addition, the connecting part between balloon 1 and cannula 2 is protected by protective tube 1.
4, the aforementioned insertion section 3
The connection portion between the balloon 1 and the cannula 2 will not be bent and the strength of the base portion of the balloon 1 will not be reduced when the balloon 1 is inserted into the tube a or the narrowed path 6.

After the balloon 1 connected to the tip of the cannula 2 is guided into the affected area 7 from the stenosis path 6 as described above, the balloon 1 is introduced into the flexible tube 10 from the syringe 11 connected to the syringe attachment part 12 at the rear end of the cannula 2. By supplying pressurized air through the air supply path 10a, the inflation and deflation body portion 1 of the balloon 1 is
Expand 3. Here, the coil spring 19 provided in the inflatable body part 13 is swung in either direction depending on the internal shape of the affected area 7, so that the inflatable body part It becomes a deformed and expanded state in which a part of the body bulges out greatly. As a result, when the affected area 7 shrinks and pressurizing force is applied from the outside to the inflating/contracting body part 13, the reaction force will be concentrated on the bulging part mentioned above, so the balloon 1 will be placed on the stenosis path 6 side. There is no fear that it will be pushed back, and it will be kept in an extremely stable state within the affected area 7.

Next, the endoscope 3 is taken out of the patient P's body as shown in FIG. 2 while the inflatable body portion 13 is held in an inflated state. At this time, a tensile force is applied to the cannula 2, and a force is applied in the direction in which the inflatable body portion 13 extends, and in particular, the root portion on the bulging side tends to expand the most, but this region has no protection. Since the tube 14 is provided, there is no risk of the tube bursting due to increased stress. Then, the cannula 2 is inserted into a direct-viewing endoscope such as a biliary tract endoscope, and the endoscope is fitted into the cannula 2.
By inserting the endoscope into the body of the patient P using the guide as a guide, it becomes possible to easily insert the endoscope into a site where it is difficult to insert such a direct-viewing endoscope.

In addition, as shown in Fig. 6, the protective tube 1
Even if 4' is provided outside the expansion/contraction body part 13,
Needless to say, the same effect as described above can be obtained.

Next, FIG. 7 to FIG. 11 show a second embodiment of the present invention. By forming the portion thick, the base portion serves as the protection portion 22a. In addition, by changing the wall thickness of the inflatable body part 22 in the circumferential direction, when pressurized air is supplied to the inflatable body part 22, the thin part 22b of the inflatable body part 22 is The thick portion 22c is configured to expand and expand more than the thick portion 22c.

With this configuration, as in the first embodiment described above, the balloon can be indwelled in the body reliably, and the base of the inflation/deflation body 22 can be protected. There is no risk of rupture etc.

Here, in order to form this expansion/contraction body part 22, a mold 23 as shown in FIG. 10 is immersed in a silicone rubber solution bath 24 as shown in FIG. A skin is formed on the mold 23 with a thin wall on one side and a thick wall on the other side.
The part A may be immersed in the solution tank 24 again to form the part A thick.

In addition, in each of the above-mentioned embodiments, a cannula equipped with a balloon for indwelling in the body was configured as a guide for a biliary tract endoscope, but the cannula can also be configured to be inserted through a blood vessel, urethra, etc. You can also do it. In addition, in the second embodiment, a core material such as a coil spring 19 similar to that shown in the first embodiment is installed between the connecting ring 20 attached to both ends of the expansion/contraction body portion 22 and the tip cap 21. It may also be provided.

[Effects of the invention] As detailed above, the present invention is configured to deform and expand the inflatable body when pressurized fluid is supplied to the inflatable body. Since it has a structure in which a protective part is formed on the part, it is easy to indwell in the body, and operations such as guiding the endoscope can be performed smoothly, and there is no inconvenience that the inflatable body part may burst inside the body. Does not occur.

[Brief explanation of drawings]

Figures 1 and 2 show how the cannula with the indwelling balloon of the present invention attached is in use. Figure 1 is an explanatory diagram of the cannula inserted into the body together with the endoscope, and Figure 2 is Figures 3 and 4, which are explanatory diagrams showing the endoscope taken out of the body, show the first embodiment of the present invention. Figure 3 is a sectional view of the cannula fitted with a balloon, and Figure 4 The figure is a sectional view of the balloon, FIG. 5 is an explanatory view of the action, FIG. 6 is a sectional view similar to FIG. Fig. 7 is an external view of the balloon, Fig. 8 is a cross-sectional view of the inflatable body, Fig. 9 is a cross-sectional view of Fig. 8, and Fig. 10 is a cross-sectional view of the inflatable body. FIG. 11 is an explanatory diagram of the process for forming the expansion and contraction body portion. 1... Balloon for indwelling in the body, 2... Cannula, 3... Endoscope, 10... Flexible tube, 1
0a... Air supply path, 13... Inflatable body part, 14... Protection tube, 15, 20... Connection ring, 17,
21...Tip cap, 22...Inflatable body part, 22
a...Protective part, 22b...Thin wall part, 22c...Thick wall part.

Claims (1)

[Claims for Utility Model Registration] (1) It has an inflatable body part made of an elastic membrane member that can be expanded and contracted, and the inflatable body part is inserted into a predetermined affected area through a constricted part such as a body cavity made of a cannula or the like. Attached to the tip of the insertion member inserted into the observation target area,
In a balloon for indwelling in the body that can be placed inside a body cavity by inflating the inflatable body part with pressurized fluid sent through the insertion member, the inflatable body part is pressurized. The deformation is achieved by forming a deformed, inflatable, and deflated body that partially swells significantly when fluid is supplied, and by providing an elastic protection portion at the connection portion of the deformed, inflated, and deflated body to the insertion member. 1. A balloon for indwelling in the body, characterized in that the base portion of the inflatable and deflated body is configured to be protected from bursting. (2) When a pressurized fluid is supplied to the inflatable body by providing an expandable core material between the base and the tip inside the inflatable body, Utility model registration claim No. 1 characterized in that the inflatable body portion is configured to deform and expand.
The balloon for indwelling in the body as described in (1). (3) By forming the thickness of the inflatable body part to be non-uniform, the inflatable body part is configured to deform and swell when pressurized fluid is supplied to the inflatable body part. Scope of claim for utility model registration (1) characterized by
Balloon for indwelling in the body as described in . (4) Utility model registration claim No. (1) characterized in that the protection part is formed by attaching a protection tube to the inside or outside of the root part of the inflatable body part. Balloon for indwelling in the body as described in . (5) Utility model registration claim No. 1, characterized in that the protection portion is formed by forming the root portion of the expansion and contraction body portion to be thick.
The balloon for indwelling in the body as described in (1).