JPH054806Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a contrast medium tube, a cannulation tube, and other treatment instruments that are inserted through an endoscope such as a duodenoscope.

[Prior Art] Various treatment tools are inserted into an endoscope through a treatment tool insertion channel provided in its insertion portion. For example, a treatment tool such as a cannulation tube is inserted through the duodenoscope and inserted into the bile duct or pancreatic duct via the papilla. Here, since the papilla opens into the cavity wall of the body cavity, the structure of the rigid distal end of the insertion section of the endoscope inserted along the cavity is such that, together with the illumination window and the observation window, the Generally, a so-called side view type is used, in which a portion is provided on the side of the hard tip portion.

Therefore, the treatment tool main body inserted into the insertion section of the treatment tool needs to be made of a flexible material,
Furthermore, this treatment instrument must also have a small diameter because it is inserted into a narrow orifice such as a nipple. When inserting such a treatment instrument into a stenosis as described above, the angle portion is operated to position the treatment instrument lead-out portion in the rigid tip portion to a position directly facing the opening portion, and the treatment tool provided in the rigid tip portion is placed in a position directly facing the opening. By operating the instrument stand, etc., the tip of the treatment instrument is sequentially paid out while controlling the posture of the treatment instrument so that the protruding part from the treatment instrument lead-out part of the treatment instrument main body faces the opening into which it is inserted. and then perform the insert operation.

[Problems to be solved by the invention] By the way, the treatment instrument main body is made of a small diameter and flexible member, and it is made to protrude by a certain length from the treatment instrument lead-out part, and is inserted into the insertion target. You must aim at the opening.
Moreover, in order to insert the treatment instrument into an extremely narrow opening, such as the aforementioned nipple, which has a large angle with respect to the insertion direction of the insertion section in the cavity wall portion of the cavity, it is necessary to use a treatment instrument stand. Simply bending the tip of the tool body may not be sufficient to control its direction. For this reason, before actually inserting the treatment instrument into the insertion channel, the distal end of the treatment instrument body is manually squeezed to give it a bending tendency.

However, if the treatment instrument is inserted into the treatment instrument insertion channel in such a bent state, not only may the operability of the insertion operation within the treatment instrument insertion channel become poor, but also
The part that was bent while being inserted into the treatment instrument insertion channel may be restored, etc.
It may not be possible to obtain a sufficient bending angle, and furthermore, twisting may occur during insertion, and the main body of the treatment instrument may be bent in a direction different from the intended direction at the position of the treatment instrument stand. Because of this, there are drawbacks such as worsening of its sniping ability.

The present invention was developed in view of the above points, and its purpose is to ensure that when the main body of the treatment instrument is protruded from the rigid distal end of the insertion section of the endoscope, it is directed in the desired direction. An object of the present invention is to provide an endoscopic treatment tool that can be bent toward the end.

[Means for solving the problems] In order to solve the above-mentioned problems, the present invention has the following features:
A flexible tube-shaped treatment instrument that is inserted through a treatment instrument insertion passage of a side-viewing endoscope and guided out from the treatment instrument insertion passage in a bent state at a predetermined angle. A shape memory member is attached to the distal end portion of the treatment instrument main body, which restores the memorized shape bent in the direction in which the treatment instrument main body is inserted when the temperature reaches body temperature or slightly higher than the body temperature, and The present invention is characterized in that a mark that is displayed in the direction of bending by the shape memory member is formed on the distal end portion of the treatment instrument main body.

[Function] By configuring as described above, when the treatment instrument is guided into the body through the treatment instrument insertion channel of the endoscope, it is always bent in a constant state, and the endoscope is bent in a constant state. Even if the insertion section of the speculum opens into the body cavity into which it is inserted, at a certain angle with respect to the insertion direction of the insertion section, and the opening is narrow, the main body of the treatment instrument The ability to target the portion into which the tip portion should be inserted becomes extremely good.

The shape memory member is designed to recover its memorized shape when the temperature reaches or slightly higher than body temperature. When it is made to protrude into the body cavity from the lead-out part, it reliably recovers the memorized shape. When the endoscope is inserted into the body cavity, the part where the hard tip is located becomes hot due to the heat from the illumination light.
For example, it is possible to increase the transformation temperature to 40°C or higher.

Furthermore, since a mark indicating the direction in which the treatment tool will be bent by the shape-memory member is provided at the tip of the treatment tool body, even if the treatment tool is twisted or otherwise displaced while being inserted along the treatment tool insertion passage, the direction can be adjusted before the treatment tool assumes its memorized shape by leaving it slightly protruding from the treatment tool insertion passage.

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

As shown in FIG. 5, the endoscope is configured by connecting an insertion portion 2 for insertion into a body cavity to a main body operation portion 1.
The majority of the portion from the connecting side to the catheter is a flexible section 2a, to which an angle section 2b is connected, and further to the tip of the angle section 2b a hard tip section 2c is connected. The insertion section 2 is inserted through the oral cavity, nasal cavity, etc., and the hard tip section 2
c can be guided to the desired site for observation and treatment.

For example, as shown in FIG. 3, when a contrast agent or the like is supplied from a cavity wall A in a body cavity through a papilla B into an organ C such as a bile duct or pancreatic duct, the fourth As shown in the figure, an illumination window 3 and an observation window 4 are formed on the side of the rigid tip portion 2c, and a treatment instrument lead-out portion 5 is also formed. Further, a treatment instrument insertion channel (not shown) is formed between the treatment instrument lead-out section 5 and the treatment instrument insertion section 6 attached to the connecting portion between the insertion section 2 and the main body operation section 1.

Then, in order to inject a medical solution such as a contrast medium into the organ C from the aforementioned nipple B, a contrast medium tube,
Treatment tools 10 such as cannulation tubes, etc.
is inserted into the treatment instrument insertion channel from the treatment instrument insertion section 6 described above, and its distal end portion can be made to protrude from the treatment instrument delivery section 5, as is clear from FIG. In order to control the direction of the distal end portion of this treatment instrument 10,
A treatment instrument stand 7 is installed inside the treatment instrument lead-out section 5, and by operating the treatment instrument stand 7, the bending angle of the distal end portion of the treatment instrument 10 can be changed. It's getting old.

As shown in FIG. 1, the treatment instrument 10 has a main body tube 11 constituting a treatment instrument main body formed of a small diameter tube made of fluororesin or the like, and the proximal end of the main body tube 11 A connection part 13 for connecting a liquid supply means 12 for supplying a liquid such as a contrast agent is connected to the part. Further, the distal end portion 11a of the main body tube 11 is designed so that when the temperature exceeds a certain level, the portion that protrudes from the treatment instrument lead-out portion 5 is bent as shown by the two-dot chain line in the same figure. A shape memory alloy ring 14 having a memorized C-shaped cross section is attached. As is clear from FIG. 2, the shape memory alloy ring 14 is designed to be inserted into the main body tube 11. In order to fix the ring 14, a constricted part 15, which is normally formed in the vicinity of the tip of the main body tube 11 to prevent it from coming off from the affected area, is used. It is maintained so as not to deviate from 11. Furthermore, main body tube 1
A colored mark 16 is attached in the axial direction of the outer surface of the tip portion 11a of 1, which faces inward in the bending direction.

The present embodiment is configured as described above, and the rigid distal end portion 2c of the insertion portion 2 is guided to a position facing the nipple B in the cavity A, and in this state, the main body tube of the treatment instrument 10 is inserted. 11 is inserted into the treatment instrument insertion channel from the treatment instrument insertion portion 6, and is made to protrude from the treatment instrument lead-out portion 5 provided on the side of the rigid distal end portion 2c. Here, main tube 1
A shape memory alloy ring 14 is attached to the tip portion 11a of 1.
The ring 14 is installed in a straight state so that the part to which the ring 14 is attached can be smoothly guided from the treatment instrument insertion section 6 to the treatment instrument outlet section 5 via the treatment instrument insertion channel.

In this way, the main body tube 11 of the treatment instrument 10
By operating the treatment instrument stand 7 in a state in which the treatment instrument stand-up table 7 is exposed from the treatment instrument lead-out portion 5, the distal end portion 11a of the main body tube 11 is bent at a predetermined angle. Then, when the part of the main body tube 11 on which the shape memory alloy ring 14 is attached is made to protrude from the treatment instrument lead-out part 5, this shape memory alloy ring 14
is heated to its transformation temperature, and its thermoelasticity restores it to its memorized bent state. Here, if the memorized shape by the shape memory alloy ring 14 is made to match the angle θ of the nipple B with respect to the cavity wall A (see FIG. 3), the treatment instrument lead-out portion 5 provided on the hard tip portion 2c can be When placed at a predetermined position with respect to B, the distal end portion 11a of the main body tube 11 of the treatment instrument 10 can be reliably directed toward the nipple B, and its aiming performance is significantly improved.

As mentioned above, in order to reliably aim the tip of the main body tube 11 at the nipple B, the main body tube 11 must be inserted with the main body tube 11 facing in a certain direction.
Mark 16 is attached to the tip of the
The directionality can be confirmed using this mark 16 as a reference. Here, since the shape memory member 14 is guided out for a predetermined length from the relatively narrow treatment instrument lead-out section 5, once it has recovered its memory shape, it is almost impossible to adjust its directionality, and in severe cases , there is a risk that it may bend in the direction of the treatment instrument elevator 7 and become entangled with the treatment instrument elevator 7 and its operating wires. However, if the mark 16 is
1a, when the main body tube 11 is slightly protruded from the treatment instrument lead-out portion 5, this mark 16 immediately enters the observation field of the endoscope 1, so the bending direction is shifted. , the orientation can be reliably adjusted before restoring the memorized shape. Furthermore, even if the main body tube 11 is twisted during the insertion of the treatment instrument through the channel, the distal end portion 11a of the main body tube 11 may be slightly peeked out from the treatment instrument lead-out portion 5, and the mark 16 can be seen through the observation window 4. By twisting the main body tube 11 in the opposite direction while visually checking the position, the main body tube 11 can be returned to the correct orientation.

Here, it is preferable that the transformation to the memorized shape in the shape memory alloy ring 14 described above occurs at body temperature, that is, about 35 to 37°C. However, when the endoscope is inserted into the body, the temperature in the body cavity will rise due to the heat of the illumination light, so a shape memory alloy with a transformation temperature of 40° C. or higher may be used.
In addition, this shape memory alloy ring is attached to the main body tube 1.
1, or a strip-shaped shape memory alloy may be attached to or embedded in the main body tube 11. Furthermore, a shape memory resin may be used as the shape memory member, and this shape memory resin may be embedded in the tube. It is also possible to form it into a shape and connect it to the tip of the main body tube 11.

[Effects of the invention] As explained above, according to the invention, a shape memory member is provided at the tip of the treatment instrument body, and when the temperature reaches body temperature or slightly higher than body temperature, the tip becomes bent. Since the treatment instrument is configured so that it recovers to a normal state, when it is made to protrude from the hard tip portion of the insertion section, it can be reliably bent in a desired direction, and the target portion of the treatment instrument body to be inserted can be targeted easily. In addition, since the memorized shape is a bent shape, if the direction of the treatment instrument is deviated, it will not be possible to protrude from the insertion path of the treatment instrument. Sometimes it is not possible to ensure accurate aiming, but since there is a mark on the tip of the treatment instrument,
This provides various effects such as being able to reliably and easily and accurately adjust the direction of the treatment instrument main body before it takes on a memorized shape.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is an external view of the treatment instrument, and Figure 2 is the − of Figure 1.
FIG. 3 is an enlarged cross-sectional view, FIG. 3 is an explanatory diagram of the operation of the treatment instrument, FIG. 4 is an external view of the rigid distal end portion of the endoscope, and FIG. 5 is an overall configuration diagram of the endoscope. DESCRIPTION OF SYMBOLS 1... Main body operation part, 2... Insertion part, 10... Treatment instrument, 11... Main body tube, 11a... Tip part, 14... Shape memory alloy ring, 16... Mark.

Claims (1)

[Scope of utility model registration request] A flexible tube-shaped member of a treatment instrument that is inserted through a treatment instrument insertion passage of a side-viewing endoscope and guided out from the treatment instrument insertion passage in a bent state at a predetermined angle. A shape memory member is attached to the distal end portion of the treatment instrument body, which restores the memorized shape bent in the direction in which the treatment instrument body is inserted when the temperature reaches or slightly higher than the body temperature, and the shape memory member 1. A treatment instrument for an endoscope, characterized in that a mark is formed on a distal end portion of the treatment instrument main body to indicate a direction in which the member bends the instrument.