JP2540408Y2 - Endoscope treatment instrument raising device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for raising a treatment tool of an endoscope for remotely controlling a projecting direction of a treatment tool for an endoscope such as forceps.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional treatment instrument raising device for an endoscope.

[0003] An endoscopic treatment tool 52 such as a biopsy forceps or a tube is inserted through a treatment tool channel 51 inserted into a flexible elongated insertion portion 50, and the treatment tool 5 is inserted into the treatment instrument channel 51.
The second end protrudes outward from the front end 53 of the insertion section 50.

[0004] Reference numeral 60 denotes a treatment tool raising device, which is formed by a treatment tool raising table 61 and operation wires 66.

[0005] The treatment instrument raising table 61 has a treatment instrument channel 5
1 for raising the distal end of the treatment tool 52 having passed through the inside of the distal end portion 53, and the pin 6 is inserted into the distal end portion 53.
2 so as to be rotatable.

The operation wire 66 is for remotely operating the treatment instrument raising table 61, and is inserted into the insertion section 50 with its tip connected to the treatment instrument raising table 61, and is leftward in FIG. (Not shown).

[0007] The operation wire 66 is a tightly wound coil 67.
Both ends of the densely wound coil 67 are fixed to the distal end portion 53 and the operation section. Therefore, when the operation wire 66 is pulled from the operation section side, the treatment instrument raising table 61
Rotates upward.

As a result, the distal end portion of the treatment tool 52 projecting obliquely forward from the opening 57 of the distal end portion 53 is raised almost vertically.

[0009]

However, when the insertion portion 50 of the endoscope inserted into a body cavity or the like bends in a loop shape, the close-wound coil 67 in the insertion portion 50 also bends.

Then, the entire length of the close-wound coil 67 is extended, so that the operation wire 66 is drawn into the close-wound coil 67, and the treatment instrument raising table 61 is pulled up by the operation wire 66 and rises. Would.

Therefore, even if the treatment instrument raising table 61 is to be laid down as shown in FIG. 9, simply pushing the operation wire 66 will only cause the operation wire 66 to bend in the looped tightly wound coil 67. Therefore, the pressing force is not transmitted to the treatment tool raising table 61 and the treatment tool raising table 61 cannot be laid down.

Further, even if the insertion section 50 is straight, if the operating tool 66 is simply pushed in while the treatment instrument raising table 61 is raised, the insertion tool 50 may be temporarily raised due to frictional resistance in the tightly wound coil 67 or the like. The raised treatment instrument raising table 61 may not be restored.

As a result, in the conventional treatment instrument raising device for an endoscope, as shown in FIG.
In some cases, the distal end of the treatment instrument 52 inserted into the insertion portion 50 may be stuck to the treatment instrument raising table 61 and not protruded outward from the distal end portion 53 of the insertion portion 50.

This invention solves such a conventional drawback, and enables the treatment instrument raising table to lie down even when the insertion portion of the endoscope is bent, so that the treatment instrument can be reliably projected. Accordingly, it is an object of the present invention to provide a treatment instrument raising device for an endoscope which enables use of the endoscope under any circumstances.

[0015]

In order to achieve the above object, the present invention provides a treatment tool raising device for an endoscope, the treatment tool raising device being movably provided at the distal end of a flexible elongated insertion portion. The upper table and the distal end are connected to the treatment instrument raising table, and have an operation wire inserted through the insertion portion, and the operation wire raising table is moved by pulling the operation wire from the base end side. In a treatment instrument raising device for an endoscope in which a distal end portion of a treatment tool protruding outward from an inside of a distal end portion of an insertion portion is raised, the treatment instrument raising table is raised at a distal end portion of the insertion portion. It is characterized in that there is provided a raising table urging means for urging in a direction opposite to the upward direction.

[0016]

An embodiment will be described with reference to the drawings.

FIG. 1 is a side sectional view schematically showing a first embodiment of the present invention, FIG. 3 is an external perspective view thereof, and FIG. 4 is an entire endoscope to which this embodiment is applied. FIG.

As shown in FIG. 4, the endoscope is formed by connecting an elongated insertion section 10 to an operation section 1 having an eyepiece section 2.

Most of the insertion portion 10 is formed by an elongated flexible tube portion 11 made of a flexible material. The distal end portion of the flexible tube portion 11 is connected to a bending portion 12 that bends by remote operation from the operating portion 1, and the distal end portion of the bending portion 12 is connected to a distal end portion 13 having a built-in objective optical system or the like. Have been.

A treatment instrument channel 31 such as a biopsy forceps for penetrating a treatment tool 30 for an endoscope is inserted into the insertion section 10 over the entire length of the insertion section. Is communicated with a treatment instrument guiding chamber 15 formed in the distal end portion 13.

The treatment tool guiding chamber 15 has a treatment tool window 15a that opens laterally, and a treatment tool raising table 21 is mounted below the treatment tool window 15a.

As shown in FIG. 1, the treatment instrument raising table 21
Is rotatably supported by the tip portion 13 by a pin 22. And, in this treatment instrument raising table 21,
The distal end 24a of the operation wire 24 of the treatment instrument raising device 20 is connected.

The operation wire 24 is for pushing and pulling the treatment instrument raising table 21 by remote control. The operation wire 24 passes through the insertion section 10 and has a proximal end 24 b side formed on the operation section 1. It is connected to the operation lever 25 of the raising device 20.

The operation wire 24 is inserted into a tightly wound coil 27 in which a thin stainless steel wire is wound tightly so as to be able to advance and retreat. The close-wound coil 27 is inserted into the insertion portion 10 over the entire length, and both ends thereof are fixed to the rigid distal end portion 13 and the rigid portion of the operation portion 1.

The treatment instrument raising device 20 is further provided with a coil spring 28 (raising table urging means). The winding portion 28a of the coil spring 28 is wound around the pin 22, and a base portion 28b extending to one side from the winding portion 28a is inserted into the hole 16 formed in the distal end portion 13,
The urging portion 28c extending to the other side is engaged with the treatment instrument raising table 21.

In this manner, the treatment instrument raising table 21 is urged by the urging portion 28c of the coil spring 28 in the direction opposite to the raising direction (arrow B).

When the insertion section 10 draws a loop in a body cavity or the like during use of the endoscope, the close-wound coil 27 is curved, and as a result, its entire length is extended. Then, the operation wire 24 is retracted into the close-wound coil 27, and the treatment instrument raising table 21 is raised.

However, when the operating lever 25 is rotated in the direction opposite to the arrow A in FIG. 4 to apply a slight pushing force to the operating wire 24, the pushing force and the urging force of the coil spring 28 act in the same direction. Then, the treatment tool raising table 21 is rotated in the direction opposite to the raising direction (arrow B), and as a result, the treatment tool raising table 21 is restored to the original non-raised state.

In this state, when the treatment instrument 30 is inserted into the treatment instrument channel 31, the distal end of the treatment instrument 30 is moved to the treatment instrument window 1.
5a.

Then, when the operation lever 25 is rotated in the direction of arrow A in FIG. 4 and the operation wire 24 is pulled from the base end 24b side, the operation wire 24 moves inside the densely wound coil 27 to the left in the figure. As shown by a two-dot chain line in FIG. 1, the treatment tool raising table 21 rotates toward the treatment tool window 15a.

As a result, as shown in FIGS. 3 and 4, the distal end of the treatment tool 30 which has been slightly inclined and protruded from the treatment tool window 15a as shown in FIGS. And protrudes substantially vertically from the treatment instrument window 15a.

In FIG. 3, reference numeral 18 denotes an observation window for observing the inside of a body cavity, and 19 denotes an illumination window for illuminating an observation portion.

As shown in FIG. 2, a coil spring 28 is formed by an elastic body 29 made of an elastic synthetic resin film or the like.
If the outer surface of the coil spring 28 is covered, even if the coil spring 28 breaks in any way, the fragments will not come off and fall into the body cavity of the patient, thus improving the safety of the endoscopic examination. Can be secured.

FIG. 5 is a side sectional view showing a second embodiment of the present invention. This embodiment differs from the first embodiment only in that a coil spring 40 for compression is used instead of the coil spring 28, and the coil spring 40 is loosely wound around the operation wire 24, and the coil spring 40
Are in contact with the rear wall of the distal end portion 13 and the surface of the treatment instrument raising stand 21.

As a result, the coil spring 40 urges the treatment instrument raising table 21 in the direction opposite to the raising direction B with the rear wall of the distal end portion 13 as a fulcrum.

FIG. 6 is a side sectional view showing the third embodiment. This embodiment is different from the first embodiment only in that a coil spring 41 for tension is used instead of the coil spring 28.

The coil spring 41 is interposed between the bottom wall of the distal end portion 13 and the treatment instrument raising stand 21, and both ends thereof are fixed to the bottom wall of the distal end portion 13 and the back surface of the treatment instrument raising stand 21. . Thereby, with the bottom wall of the tip portion 13 as a fulcrum,
Coil spring 41 raises treatment instrument raising table 21 in direction B
And pull in the opposite direction.

FIG. 7 is a side sectional view showing a fourth embodiment. In this embodiment, the coil spring 28 of the first embodiment is used.
Instead, a plate-shaped superelastic spring 42 made of a superelastic alloy such as a nickel titanium alloy was used.

The proximal end portion of the superelastic spring 42 is inserted into a slit 17 formed in the rear wall of the distal end portion 13, and the distal end portion is fixed to the back surface of the treatment instrument raising stand 21 with a stud 43. I have.

Thus, when pulled in the raising direction B by the operation wire 24, the superelastic spring 42 urges the treatment instrument raising table 21 in the direction opposite to the raising direction B.

The superelastic spring 42 used here has remarkably high elasticity, and maintains its elasticity without being plastically deformed even after repeated use for a long period of time, and has excellent durability.

As shown in FIG. 8, the super elastic spring 42 is made of an elastic body 49 made of an elastic synthetic resin film or the like.
If the super elastic spring 42 is broken in any way, the fragments will not come off and fall into the body cavity of the patient, so that the safety of the endoscopic examination can be improved. Nature can be secured.

If the coil spring 28 of the first embodiment is formed of a superelastic alloy similar to the superelastic spring 42 of the fourth embodiment, a large elasticity can be obtained even if the number of turns of the winding portion 28a is reduced. Obtainable. Therefore, by reducing the number of turns of the winding portion 28a to one, the coil spring 28 can be reduced in size, and as a result, the coil spring 28 can be attached to the treatment instrument raising stand 21 in a small space. Further, if a certain degree of elasticity can be obtained, the winding portion 28a may be omitted.

In each of the above embodiments, the operation wire 24
Although the endoscope using the close-wound coil 27 as the guide has been described, the same effect can be obtained in an endoscope using no close-wound coil 27.

The treatment tool raising table 21 is not limited to the one that rotates around the pin 22, and may be one that slides back and forth along the bottom wall of the treatment tool guiding chamber 15.

[0046]

According to the treatment instrument raising device of the endoscope of the present invention, the raising table urging means urges the treatment tool raising table in a direction opposite to the raising direction to raise the treatment tool raising table. Since the instrument is restored to the state before the upper operation, the treatment tool can be reliably projected from the distal end of the insertion section, and as a result, an excellent effect that the endoscope can be reliably used in any situation. There is.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

FIG. 2 is a partial enlarged cross-sectional view of the first embodiment of the present invention.

FIG. 3 is an external perspective view of the first embodiment of the present invention.

FIG. 4 is a schematic view of an endoscope to which the first embodiment of the present invention is applied.

FIG. 5 is a side sectional view of a second embodiment of the present invention.

FIG. 6 is a side sectional view of a third embodiment of the present invention.

FIG. 7 is a side sectional view of a fourth embodiment of the present invention.

FIG. 8 is a partial enlarged sectional view of a fourth embodiment of the present invention.

FIG. 9 is a side sectional view of a conventional example.

FIG. 10 is a side sectional view of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 insertion portion 13 distal end portion 20 treatment tool raising device 21 treatment tool raising table 24 operation wire 28 coil spring (raising table urging means) 30 treatment tools 40, 41 coil spring (raising table pressing means) 42 superelastic spring (raising) Upper stand urging means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noboru Ujiie Asahi Kogaku Kogyo Co., Ltd. 2-36-9 Maenocho, Itabashi-ku, Tokyo (56) References Hirai 2-91504 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A treatment instrument raising table movably provided at a distal end of a flexible elongated insertion section, and an operation wire having a distal end connected to the treatment instrument raising table and inserted through the insertion section. An endoscope having a distal end portion of a treatment instrument protruding outward from the distal end portion of the insertion portion by moving the treatment instrument raising table by pulling the operation wire from a proximal end side; of the treatment instrument raising device, the distal end of the insertion portion, the treatment instrument elevator the elevator direction opposite elevator biasing means for constantly urging the the treatment instrument
A treatment instrument raising device for an endoscope, wherein the treatment tool raising device is provided so as not to contact with the endoscope.