JP2002263062A - Treating instrument insertion tube for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treating instrument insertion tube of endoscopes which is so built as to secure the sufficient quantity of a perfusate even with a treating instrument inserted thereinto by ensuring the inner diameter of a channel positioned at a curved part. SOLUTION: In the treating instrument insertion tube 9 of an endoscope 1 which has a flexible tube 18 and a coil 19 wound spirally on the outer circumference of the tube 18, the inner diameter of the tube 18 at the part wound with the coil 19 is larger than that of a part wound with no coil 19 between both end parts of the coil 19 in the direction of the long axis of the tube 18.

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 tube for an endoscope, which is arranged in an endoscope and forms a channel (channel) for inserting a treatment instrument.

[0002]

2. Description of the Related Art Generally, an endoscope 1 is known in Japanese Utility Model Publication No. 59-36302, but as shown in FIG. 1, an insertion section 2, an operation section 3, and a distal end 2a of the insertion section 2. It comprises a bending section 4 disposed in the vicinity, a bending operation lever 5 disposed on the operation section 3, and the like. As shown in FIG. 2, a wire 6 connecting the bending portion 4 and the bending operation lever 5 is provided in the insertion portion 2.
, An image transmission system 7, an illumination light transmission system 8, and a treatment instrument insertion tube 9 forming a channel are inserted therein. One end of the treatment instrument insertion tube 9 is open at the distal end 2a of the insertion section 2,
The other end is open to a hand-side opening 10 on the operation unit 3.

[0003] As shown in FIG.
It is composed of a tube 11 made of resin and a metal coil 12 formed in a spiral shape. As shown in FIG. 3B, the tube 11 has an inner diameter D1 over its entire length and an outer diameter D2.
However, the outer diameter D3 at the distal end portion 11a corresponding to the curved portion 4 is formed smaller than the outer diameter D2 in order to make a space for winding the coil 12.
Then, as shown in FIG. 3A, the coil 12 has an outer diameter D3.
And wound around the outer periphery of the tube.

The inner diameter D4 of the coil 12 is slightly smaller than the outer diameter D3 of the distal end 11a of the tube 11. That is, D4
<D3, the coil 12 bites into the tube 11.

For this reason, as shown in FIG. 3 (a), the tube 11 at the distal end 11a with the coil 12 wound thereon is used.
Is smaller than the inner diameter D1 of the original material of the tube 11.

On the other hand, as shown in FIG. 4, a base 13 is attached to the proximal opening 10 of the endoscope 1. The base body 14 is open in three directions, and its base end side opening 14a
Is watertightly connected to the proximal opening 10. A rubber stopper 15 is attached to the distal end opening 14b. The water supply tube 16 is connected to the side opening 14c. A hole 15a is provided in the rubber stopper 15, and a treatment tool 17 is inserted into the hole 15a.

When the treatment instrument 17 is inserted through the hole 15a, the hole 15a
And the treatment tool 17 are in close contact with each other in a watertight manner. Treatment tool 17 has hole 15a
Through the proximal opening 10 and inserted into the treatment instrument insertion tube 9, and protrudes from the distal end 2 a of the insertion section 2.

[0008]

In general, endoscopes used particularly in the fields of urology and obstetrics and gynecology require a perfusion solution to be supplied into the body cavity to observe and treat the body cavity by inflating the body cavity. As shown in FIG. 4, the perfusate injected from the water supply tube 16 flows through the gap between the treatment tool 17 and the treatment tool insertion tube 9, and flows out of the distal end portion 2 a of the insertion section 2 into the body cavity.

Here, since the inner diameter D4 of the coil 12 is smaller than the outer diameter D3 of the distal end 11a of the tube 11 of the treatment instrument insertion tube 9, the thin distal end 11a of the tube 11, as shown in FIG. When the coil 12 is wound around the tube 11, the coil 11 tightens the tip 11a of the tube 11 so that the inner diameter of the tip 11a becomes D5 and the inner diameter D1 of the material of the tube 11.
Smaller than.

Therefore, the treatment tool 17 is connected to the distal end of the tube 11.
In the state of being inserted through 11a, there is a problem that the gap between the treatment tool 17 and the treatment tool insertion tube 9 becomes small at the distal end 11a around which the coil is wound, and a necessary amount of perfusate cannot be obtained. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to secure the inner diameter of a channel located at a position where a coil body is wound, thereby allowing a treatment tool to be inserted therethrough. Another object of the present invention is to provide a treatment tool insertion tube for an endoscope having a structure capable of ensuring a sufficient perfusate volume.

[0012]

According to the first aspect of the present invention,
In a treatment instrument insertion tube for an endoscope having a flexible tube body and a coil body wound around the outer periphery of the tube body,
In the longitudinal axis direction of the tube body, at least between both ends of the coil body, the inner diameter of the tube body where the coil body is wound is a diameter larger than the inner diameter of the part where the coil body is not wound. It is characterized by having.

According to a second aspect of the present invention, there is provided a treatment instrument insertion tube for an endoscope having a flexible tube body and a coil body wound around the outer periphery of the tube body, wherein the coil body is wound. The inner diameter of the material of the above-mentioned tube body of the above-mentioned portion is made larger than the inner diameter of the portion where the above-mentioned coil body is not wound.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A treatment instrument insertion tube for an endoscope according to one embodiment of the present invention will be described with reference to FIG.

(Structure) In this embodiment, the treatment instrument insertion tube 9 of the endoscope 1 also includes a tube (body) 18 and a coil (body) 19, and as shown in FIG. The outer diameter D2 of the material 18 is the distal end portion 18a located at the bending portion 4 of the endoscope 1.
The same applies to The inside diameter of the material of the tube 18 is D1
However, the distal end portion 18a corresponding to the bending portion 4 of the endoscope 1
The inner diameter D6 of the tube 18 is formed larger than the inner diameter D1 in the other portions. Such a material of the tube 18 can be molded by a die using a core having the above dimensions.

The inner diameter D7 of the coil 19 is formed slightly smaller than the outer diameter D2 of the tube 18. For this reason,
The coil 19 is wound around the distal end portion 18a of the tube 11, and the coil 19 bites into the tube 11 as shown in FIG. 5A due to the dimensional relationship of D7 <D2. The inner diameter of the tube 18 around which the coil 19 is wound in the region of the distal end portion 18a is D1. Other configurations are the same as those described in the section of the related art.

(Operation) In this embodiment, since the inner diameter D7 of the coil 19 is smaller than the outer diameter D1 of the distal end 18a of the tube 18, when the coil 19 is wound around the tube 18, the distal end 18a
Is smaller than the inner diameter D6 at the time of initial molding due to the tightening force of the coil 19, but the inner diameter after winding the coil is substantially equal to the inner diameter D1 of the material of the tube 18, and the treatment tool 17 is
Even if it is inserted through 8a, the size of the gap between the treatment tool 17 and the tube 18 in the portion where the coil 19 is not wound becomes almost equal to the size.

(Effect) According to the present embodiment, the size of the gap between the treatment tool and the inner wall of the tube is ensured even in the portion where the coil 19 is wound, so that the amount of perfusate can be ensured.

The present invention is not limited to the above embodiments, but can be applied to other embodiments. For example, the inner diameter of the tube portion on which the coil is wound may be set to be larger than the inner diameter of the tube portion on which the coil is not wound.

[0020]

As described above, according to the present invention, at least between both ends of the coil body in the longitudinal axis direction of the tube body, the inner diameter of the tube body around which the coil body is wound However, since the diameter is equal to or larger than the inner diameter of the portion where the coil body is not wound, a sufficient amount of the perfusate through the channel can be secured even when the treatment instrument is inserted.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a configuration of a general endoscope.

FIG. 2 is a cross-sectional view of an insertion portion of the endoscope.

FIG. 3A is a longitudinal sectional view of a treatment instrument insertion tube of the endoscope, and FIG. 3B is a longitudinal sectional view of a tube material of the treatment instrument insertion tube.

FIG. 4 is a cross-sectional view showing the vicinity of a base near the hand of the endoscope.

5A is a longitudinal sectional view of a treatment instrument insertion tube of an endoscope according to an embodiment of the present invention, and FIG. 5B is a longitudinal sectional view of a tube material of the treatment instrument insertion tube.

[Explanation of symbols]

1 ... endoscope, 2 ... insertion part, 4 ... bending part, 17 ... treatment tool, 18 ...
Tube, 18a… Tip, 19… Coil, D1… Inner diameter, D2
... outer diameter, D6 ... inner diameter, D7 ... inner diameter.

Claims (2)

[Claims] 1. A treatment instrument insertion tube for an endoscope having a flexible tube body and a coil body wound around the outer periphery of the tube body, wherein at least the coil body in a longitudinal axis direction of the tube body Characterized in that the inner diameter of the tube at the portion where the coil is wound is greater than the inner diameter of the portion where the coil is not wound. tube. 2. A treatment instrument insertion tube for an endoscope having a flexible tube body and a coil body wound around the outer periphery of the tube body, wherein the tube body at a portion where the coil body is wound is provided. 2. The treatment instrument insertion tube for an endoscope according to claim 1, wherein an inner diameter of the material is larger than an inner diameter of a portion where the coil body is not wound.