JP3859489B2 - Endoscope with sheath - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the outer sheath is detachably covered on the flexible insertion portion so that the flexible insertion portion inserted into the body does not directly contact the sewage in the body, and only the outer sheath can be disposable. The present invention relates to an endoscope with a sheath sheath.
[0002]
[Prior art]
In an endoscope with an outer sheath, a channel (for example, a treatment instrument insertion channel) for passing a fluid, a treatment instrument, or the like is in contact with the sewage in the body and must be provided on the outer sheath side.
[0003]
Therefore, in a conventional endoscope with a sheath, for example, as disclosed in JP-A-1-244732, the flexible insertion portion penetrates in the longitudinal direction in the flexible insertion portion provided with an observation window at the tip. A treatment instrument insertion channel made of a flexible tube inserted and arranged in the outer sheath is passed through the guide pipe line of the flexible insertion portion and attached to the proximal end side of the guide pipe line. The base end of the treatment instrument insertion channel is connected to and fixed to the base member.
[0004]
[Problems to be solved by the invention]
In an endoscope, generally, when a flexible insertion portion is bent with a small radius of curvature or a bending portion formed at a distal end portion of the flexible insertion portion is bent, the flexible insertion portion is inserted into the flexible insertion portion. The treatment instrument insertion channel in which both ends are fixed is stretched in the flexible insertion portion, and other built-in items such as optical fiber bundles arranged alongside the treatment instrument insertion channel are damaged. May end up.
[0005]
In particular, in an endoscope with a sheath sheath having the above-described structure, a treatment instrument insertion channel on the sheath sheath side is inserted into a guide channel inserted through a flexible insertion portion of the endoscope. Since it has a heavy tube structure, if that portion is bent, a very strong tension force is generated and the optical fiber bundle or the like is easily damaged.
[0006]
Therefore, the present invention is not limited to the case where the double tube structure portion in which the channel on the outer sheath side is inserted into the guide conduit inserted through the flexible insertion portion of the endoscope may be bent with a small radius of curvature. It is an object of the present invention to provide an endoscope with a sheath sheath excellent in durability that does not generate a strong tension force that damages a built-in object.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, the endoscope with a sheath sheath according to the present invention opens into the flexible insertion portion having the observation window at the distal end, at the distal end side and the proximal end side of the flexible insertion portion. A guide duct is inserted and arranged, and one end opens at the distal end portion of the outer sheath in the outer sheath that is detachably covered by the flexible insertion portion in order to insulate the flexible insertion portion from the external environment. In an endoscope with a sheath sheath in which a flexible tube-like channel that is passed through the guide pipe line and drawn out from the base end of the guide pipe line is inserted, the endoscope is attached to the base end side of the guide pipe line. The base end portion of the channel is connected to the base member so as to be movable in the axial direction.
[0008]
In addition, this invention has a big effect, when the guide pipe line is arrange | positioned in the position displaced from the center axis line of the flexible insertion part.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
In FIG. 3, 10 is an endoscope, 20 is an outer sheath that is detachably covered by the flexible insertion portions 11, 12, and 13 of the endoscope 10, and 30 is a guide tube 17 of the endoscope 10 ( This is a suction adapter (a cap-like member) that is detachably attached to the proximal end side connection tube 17b of the guide pipe).
[0010]
The flexible insertion portions 11, 12, and 13 of the endoscope 10 include a distal end portion body 13 in which a bending portion 12 that is bent by remote operation is connected to the distal end of an elongated flexible tube 11, and an observation window 14 and the like are arranged. It is configured to be connected to the tip of the bending portion 12.
[0011]
A bending operation knob 16 or the like for remotely bending the bending portion 12 is disposed on the operation portion 15 connected to the proximal end of the flexible tube 11. By rotating the bending operation knob 16, the bending portion is operated. 12 is bent as indicated by a two-dot chain line.
[0012]
Inside the flexible tube 11 and the bending portion 12, a guide tube 17 made of, for example, a flexible polyethylene resin tube is inserted and disposed at a position deviated from the central axis, and the distal end opening 17a is formed at the distal end. The proximal end of the guide tube 17 formed in the body part 13 is in communication with a proximal-side connecting cylinder 17 b that protrudes from the operation part 15.
[0013]
A cover tube 21 formed in a thin cylindrical shape with a stretchable material such as a silicone rubber tube is detachably covered on the outer sheath 20 on the flexible tube 11 and the bending portion 12 of the endoscope 10. A tip cap 22 formed of a transparent member and fitted on the tip portion main body 13 is attached to the tip thereof in a watertight manner.
[0014]
The connecting ring 24 fixed to the base end of the cover tube 21 is detachable with respect to the connecting portion 19 between the operation portion 15 and the flexible tube 11, and the manual fixing screw 25 is tightened to the connecting portion 19. Can be arbitrarily fixed.
[0015]
In the cover cylinder 21, a treatment instrument insertion channel (also a suction tube) 23 made of, for example, a flexible tetrafluoroethylene resin tube is inserted and disposed over the entire length.
[0016]
The distal end of the treatment instrument insertion channel 23 is connected to the distal end cap 22 so as to open to the outer surface at the distal end surface of the distal end cap 22, and the proximal end portion 23 a extends backward through the connecting ring 24. .
[0017]
The treatment instrument insertion channel 23 can be inserted into and removed from the guide tube 17 of the endoscope 10 over its entire length, and the proximal end portion 23a of the treatment instrument insertion channel 23 is inserted into the guide tube 17 from the distal opening 17a side. The connection tube 17b can be pulled out.
[0018]
FIG. 1 shows a use state in which an outer sheath 20 is put on the flexible insertion portions 11, 12, and 13 of the endoscope 10, and a suction adapter 30 is attached to the proximal end side connection tube 17 b of the guide tube 17. Thus, the manual fixing screw 25 is tightened to fix the connecting ring 24 to the connecting portion 19.
[0019]
As a result, the flexible insertion portions 11, 12, 13 of the endoscope 10 are insulated from the external environment by the outer sheath 20, the cover tube 21 is elastically stretched in the axial direction, and the distal end cap 22 is the distal end main body. 13 is in close contact with the tip surface.
[0020]
The suction adapter 30 has a suction base 32 to which a suction tube (not shown) is connected protruding from the side surface of the connection base 31 that is detachable with respect to the proximal end side connection cylinder 17b. A forceps plug 34 is attached to the outer end portion of the treatment instrument insertion base 33.
[0021]
The proximal end portion 23a of the treatment instrument insertion channel 23 extending from the proximal end side connection tube 17b of the guide tube 17 is movable forward and backward in the axial direction to a treatment instrument insertion hole 33a formed through the treatment instrument insertion base 33 in the axial position. The sealing O-ring 35 that is inserted and inserted into the treatment tool insertion base 33 and the connection base 31 is lightly applied to the outer peripheral surface of the proximal end portion 23 a of the treatment instrument insertion channel 23. It is in close contact and seals the part.
[0022]
With such a configuration, the treatment tool can be inserted into and removed from the treatment tool insertion channel 23 from the forceps plug 34 via the treatment tool insertion hole 33a, and a suction tube is attached to the suction base 32 as necessary. Suction can be performed via the insertion channel 23.
[0023]
The proximal end portion 23a of the treatment instrument insertion channel 23 is only lightly tightened by the O-ring 35 and is movable in the axial direction within the treatment instrument insertion hole 33a. Therefore, as shown in FIG. When the bending operation is performed and a load is applied to the treatment instrument insertion channel 23, the treatment instrument insertion channel 23 moves in the axial direction and the load is absorbed.
[0024]
As a result, in the flexible tube 11 and the bending portion 12, no strong tension is generated in the double tube structure portion in which the treatment instrument insertion channel 23 is passed through the guide tube 17, such as an optical fiber bundle or the like. There is little risk of damaging other built-in items.
[0025]
In addition, this invention is not limited to the said Example, For example, the channel of a double pipe structure may be an air supply channel, a water supply channel, etc.
[0026]
【The invention's effect】
According to the present invention, the base end of the channel disposed on the outer sheath side and passed through the guide conduit is connected to the base member attached to the proximal end portion of the guide conduit disposed on the flexible insertion portion side. By connecting the portions so as to be movable in the axial direction, the double tube structure portion in which the channel on the outer sheath side is inserted into the guide conduit inserted through the flexible insertion portion is bent with a small radius of curvature. Then, the channel moves in the axial direction in the guide pipe line, so that a strong tension force that damages other built-in objects is not generated.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an endoscope with a sheath sheath according to an embodiment of the present invention.
FIG. 2 is a side cross-sectional view of the endoscope with a sheath according to the embodiment of the present invention in a bent state.
FIG. 3 is a partial cross-sectional side view of the endoscope with a sheath sheath according to the embodiment of the present invention in a ready state for use.
[Explanation of symbols]
10 Endoscope 11 Flexible tube (flexible insertion part)
12 Curved part (flexible insertion part)
13 Tip body (flexible insertion part)
14 Observation window 15 Operation unit 17 Guide tube (guide pipe)
17a distal end opening 17b proximal end side connecting tube 20 outer sheath 21 cover tube 23 treatment instrument insertion channel 23a proximal end portion 30 suction adapter (cap-shaped member)
33a Treatment tool insertion hole 35 O-ring

Claims (2)

A guide conduit that opens on the distal end side and the proximal end side of the flexible insertion portion is inserted and disposed in the flexible insertion portion provided with an observation window at the distal end. In the outer sheath that is detachably covered by the flexible insertion portion for insulation, one end is opened at the distal end portion of the outer sheath and the other end is passed through the guide conduit. In an endoscope with a sheath sheath in which a flexible tubular channel pulled out from the proximal end of the sheath is disposed,
An endoscope with an outer sheath, wherein a base end portion of the channel is movably connected in an axial direction to a cap-like member attached to the base end side of the guide pipe. The endoscope with a sheath sheath according to claim 1, wherein the guide duct is disposed at a position displaced from a central axis of the flexible insertion portion.

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