JPH11244223A - Treating tool inserting channel of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a piecing accident, and improve durability even if a needle tip projecting puncture tool is inserted/extracted in a state of being still bending the curved part by forming the part positioned at least in the curved part out of a super elastic metallic pipe. SOLUTION: In a treating tool inserting channel 11, the part 11a on the tip side more than the connecting part 11d existing in the inserting part 1 is formed of a super elastic metallic pipe, and the part 11b on the hand side more than the connecting part 11d is formed of a flexible tube composed of a tetrafluoroethylene resin tube. In an ultrasonic endoscope formed in this way, since the part positioned in the curved part 2 of the treating tool inserting channel 11 is formed of a super elastic metallic pipe, even if a puncture tool of a needle projecting state from the tip is inserted into and extracted from the treating tool inserting channel 11 when the curved part 2 is put in a curved state, the needle tip does not stick in the treating tool inserting channel 11, so that a piecing accident of the treating tool inserting channel 11 is not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment instrument insertion channel inserted into an insertion portion of an endoscope.

[0002]

2. Description of the Related Art Generally, a treatment tool insertion channel of an endoscope is formed of a flexible tube such as an ethylene tetrafluoride resin tube. In particular, since a portion located in a bendable portion that can be bent by remote operation is repeatedly bent with a small radius of curvature, the use of a member other than a slippery flexible tube has not been considered.

[0003]

Various treatment tools are inserted into and removed from the treatment tool insertion channel of the endoscope. When performing treatment with an ultrasonic endoscope, a puncture device having a very long needle, for example, exceeding 4 cm, may be used.

[0004] When such a puncture device is inserted, if the curved portion is bent, the needle 10 attached to the tip of the puncture device 100 as shown in FIG.
1 may pierce the treatment tool insertion channel 11 in the curved portion 2 to make a hole. Treatment instrument insertion channel 1
If a hole is made in 1, water leaks into the endoscope, and heavy repair is required.

[0005] To prevent such a situation from occurring,
The needle 101 is retracted into the mantle tube 102 of the puncture device 100. However, after the needle 101 is once protruded from the treatment instrument insertion channel 11 as shown by A, when the endoscope is moved in the body cavity, the puncture tool 100 is inserted so as not to damage the body cavity. Channel 11
Retract inside. In such a case, since the needle 101 is often operated with the needle 101 protruding from the mantle tube 102, the above-described accident tends to occur.

[0006] Therefore, the present invention provides a treatment tool insertion channel for an endoscope having excellent durability that does not cause a perforation accident even when a puncture device with a protruding needle tip is inserted and removed with the bent portion being bent. The purpose is to provide.

[0007]

In order to achieve the above object, a treatment tool insertion channel of an endoscope according to the present invention has a distal end provided with a bendable bending portion provided at a distal end portion by remote control. In the treatment tool insertion channel of the endoscope inserted through the entire length of the section, at least a portion located in the curved portion is formed by a superelastic metal pipe.

[0008] The superelastic metal pipe may be connected to the flexible tube outside the curved portion. In this case, the outer periphery of the flexible tube is connected near the connection with the superelastic metal pipe. The reinforcing member may be spirally wound.

The superelastic metal pipe may have an outer diameter not exceeding the outer diameter of the flexible tube and an inner diameter larger than the inner diameter of the flexible tube.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an entire configuration of an ultrasonic endoscope, and an insertion portion 1 covered with a flexible tube is illustrated with a reduction ratio changed in the middle.

Bending part 2 connected to the tip of insertion part 1
Is bendable by an arbitrary angle in an arbitrary direction by a remote operation from an operation unit 3 connected to a base end portion of the insertion unit 1. Reference numeral 4 denotes a bending operation knob for performing the operation.

A distal end main body 5 containing an objective optical system for optical observation and an ultrasonic probe for ultrasonic tomographic observation is connected to the distal end side of the bending portion 2. It is observed through an eyepiece 6 projecting from 3.

A light guide connector 8 for receiving illumination light radiated from a light source lamp (not shown) is attached to a distal end of the first flexible connection pipe 7 connected to the operation section 3.

An ultrasonic signal connector 10 connected to an ultrasonic signal processing device (not shown) is attached to the distal end of the second flexible connection pipe 9 connected to the operation section 3.

FIGS. 2 and 3 are a plan view and a side view, respectively, of the vicinity of the distal end body 5, and the cross section of the curved portion 2 is shown. FIG. 4 is a cross-sectional view of the bending portion 2 in a state where the distal end main body 5 side is viewed from the bending portion 2.

The observation window 13 and the illumination window 14 for optical observation are
An air supply / water supply nozzle 15 is disposed near the observation window 13 on the slope formed on the tip end body 5 obliquely forward.

A treatment tool raising table 17 that is rotated around an axis 18 by an operation wire 16 that is remotely operated from the operation unit 3 is arranged alongside them, and a treatment tool raising table 17 is provided adjacent to the rear side. The outlet of the tool insertion channel 11 is arranged.

The ultrasonic probe 20 is disposed laterally on the front end portion of the distal end main body 5 and is connected to the ultrasonic device connector 10.
A signal cable 19 connecting between the first and second portions passes through the distal end portion main body 5 and further from the curved portion 2 to the inside of the insertion portion 1.

The bending portion 2 is composed of a number of articulation rings 21 rotatably connected by rivets and covered with a rubber tube 22. The bending portion 2 is pulled from the operation portion 3 side of the four operation wires 23. Bent in the direction of the operating wire 23.

Reference numerals 31 and 32 denote an air supply tube and a water supply tube, 33 denotes an image guide fiber bundle for transmitting an observation image, and 34 denotes a light guide fiber bundle for transmitting illumination light.

Returning to FIG. 1, the treatment tool insertion channel 11
Is inserted and arranged over the entire length of the insertion portion 1,
The entrance is located inside the forceps stopper 12 which is arranged obliquely upward at the lower part of the operation unit 3, and the exit is located on the distal end body 5 as described above.

In the treatment tool insertion channel 11, a portion 11a on the front side of the connecting portion 11d in the insertion portion 1 is formed by a superelastic metal pipe, and a portion 11b on the hand side of the connecting portion 11d is a tetrafluoroethylene resin. It is formed by a flexible tube made of a tube or the like.

The superelastic metal pipe 11a is made of, for example, Ti
-Ni (titanium-nickel) type, which bends with a light force and has a very high elastic limit, so that when it is disposed in the bending portion 2 of the endoscope, the bending portion 2 does not break. It can bend following the bend.

FIG. 5 shows a connecting portion A between the superelastic metal pipe portion 11a and the flexible tube portion 11b. The thin superelastic metal pipe portion 11a is formed of a flexible tube having an inner diameter equal to that of the superelastic metal pipe portion 11a. It is press-fitted and bonded into the portion 11b and connected.

In the ultrasonic endoscope thus configured, since the portion of the treatment instrument insertion channel 11 located inside the curved portion 2 is formed by a superelastic metal pipe, the curved portion 2 is bent. In this state, even if the puncture device with the needle protruding from the distal end is inserted into and removed from the treatment tool insertion channel 11, the needle tip does not pierce the treatment device insertion channel 11, and a hole in the treatment tool insertion channel 11 may be perforated. Does not occur.

When the vicinity of the connecting portion 11d of the treatment instrument insertion channel 11 is bent, the flexible tube portion 11b is sharply bent and broken near the connecting portion 11d, so that it is shown in FIG. As described above, the coil 11c made of a thin metal wire having a spring property may be spirally wound from the connecting portion 11d to the flexible tube portion 11b.

Since the superelastic metal pipe portion 11a needs to be thinner than the flexible tube portion 11b, as shown in FIG. 7, the outer diameter of the superelastic metal pipe portion 11a is If the inner diameter of the superelastic metal pipe portion 11a is made larger than the inner diameter of the flexible tube portion 11b within a range not exceeding the outer diameter of the portion 11b, the passage of the treatment instrument through the bending portion 2 can be improved. . 11
e is the super-elastic metal pipe 11a and the flexible tube 1
1b.

In the above embodiment, the superelastic metal pipe 11a is connected to the distal end body 5 so as to be connected.
Although the connecting portion 11d is located near the rear end of the curved portion 2,
In the treatment tool insertion channel 11 of the present invention, at least a portion located inside the curved portion 2 may be formed of a superelastic metal pipe.

The outer surface of the superelastic metal pipe portion 11a may be covered with any member. The present invention is not limited to the treatment instrument insertion channel of the ultrasonic endoscope, and can be widely applied to the treatment instrument insertion channel of a general endoscope.

[0030]

According to the present invention, at least a portion of the treatment instrument insertion channel located in the curved portion is formed of a superelastic metal pipe, so that the needle can be inserted from the distal end while the curved portion remains bent. Even if the puncture tool with the protruding portion is inserted into the treatment tool insertion channel, the needle tip does not pierce the treatment tool insertion channel, so that a perforated accident can be completely prevented.

[Brief description of the drawings]

FIG. 1 is an external view showing an overall configuration of an ultrasonic endoscope according to an embodiment of the present invention.

FIG. 2 is a plan view of a distal end portion of the ultrasonic endoscope showing a part of an embodiment of the present invention in a cross section.

FIG. 3 is a side view of a distal end portion of the ultrasonic endoscope showing a part of an embodiment of the present invention in a cross section.

FIG. 4 is a cross-sectional view of the bending portion of the ultrasonic endoscope according to the embodiment of the present invention, when the distal end side is viewed from the bending portion side.

FIG. 5 is a side sectional view of a connecting portion of the treatment tool insertion channel according to the embodiment of the present invention.

FIG. 6 shows a second example of the connecting portion of the treatment tool insertion channel of the present invention.
FIG. 4 is a side sectional view of the embodiment of FIG.

FIG. 7 is a third view of the connecting portion of the treatment tool insertion channel according to the present invention.
FIG. 4 is a side sectional view of the embodiment of FIG.

FIG. 8 is a schematic side view showing a state where a puncture device is inserted into and removed from the treatment instrument insertion channel in a state where the bending portion of the endoscope is bent.

[Description of Signs] 1 Insertion section 2 Bending section 11 Treatment instrument insertion channel 11a Superelastic metal pipe section 11b Flexible tube section 11d Connecting section

Claims (4)

[Claims] 1. A treatment tool insertion channel for an endoscope, wherein a bending portion which is bendable by remote control is inserted through the entire length into an insertion portion of the endoscope provided at a distal end portion thereof.
A treatment instrument insertion channel for an endoscope, wherein at least a portion located in the curved portion is formed by a superelastic metal pipe. 2. The treatment tool insertion channel for an endoscope according to claim 1, wherein the superelastic metal pipe is connected to a flexible tube outside the bending portion. 3. The treatment tool insertion channel for an endoscope according to claim 2, wherein a reinforcing member is spirally wound around the outer periphery of the flexible tube in the vicinity of a connection portion with the superelastic metal pipe. 4. The superelastic metal pipe is formed with an outer diameter not exceeding the outer diameter of the flexible tube and an inner diameter larger than the inner diameter of the flexible tube.
The treatment tool insertion channel of the endoscope according to the above.