JPH0268025A - Endoscope - Google Patents

Abstract

PURPOSE:To surely and easily guide a treating equipment for an aimed part and to improve the insertability of the treating equipment by providing a guiding protrusion to partially contact with the treating equipment to be inserted through a channel and to regulate the diametral directional movement of the treating equipment for the channel for the inner surface of the channel. CONSTITUTION:When an inserting part 4 is inserted into a body cavity, and, for example, a sheath 10 of a laser probe is inserted from a treating equipment inserting port 7 after that, this can be derived from a treating equipment deriving port 8 of a tip composing part 3 through the inside of a channel 9 to the inside of the body cavity. The section shape of the edge part of the channel 9 at the side of an operation part 1 is a circular shape, and guiding protrusions 13,..., etc., are provided for the other part of the channel 9. Thus, the sheath 10 is guided in a desired direction along the respective guiding protrusions 13,..., etc., and the sheath 10 can be surely and easily guided to the aimed part. Consequently, even when the laser probe is used as the treating equipment for example, an affected part can be safely treated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscope with an improved channel structure.

[Conventional technology]

Conventionally, endoscopes have a channel in the insertion section for inserting treatment tools, and treatment tools such as biopsy forceps and laser probes can be inserted into this channel to allow treatment while observing the inside of the body cavity from the outside. There is something. At this time, in the endoscope shown in Japanese Patent Application Laid-Open No. 57-34825,
The inner diameter of the channel portion located inside the curved tube of the insertion tube (on the distal end side of the insertion tube) is larger than the inner diameter of the channel portion located inside the flexible tube of the insertion tube (on the rear end side of the insertion tube). Even if the inner diameter of the side channel is significantly larger than the outer diameter of the treatment instrument, the radius of curvature of the channel inside the curved tube becomes extremely small (
A treatment instrument can be easily inserted into this channel.

Furthermore, when using an endoscope to treat areas filled with opaque fluid, such as blood vessels or biliary tracts, in addition to inserting the treatment instrument into a channel provided in the insertion section, it is also necessary to insert the treatment instrument into a channel provided in the insertion section. Some devices allow treatment to be performed while maintaining the visual field by injecting a transparent liquid such as physiological saline into the body cavity through the gap between the two. At this time, it is necessary to be able to sufficiently inject the transparent liquid even when the treatment instrument is inserted into the channel. Therefore, in order to secure a flow path for the transparent liquid, as shown in FIG. 7, the inner diameter of the channel a is made significantly larger than the outer diameter of the treatment instrument.

[Problem to be solved by the invention]

However, in all of the conventional configurations described above, the inner diameter of channel a is significantly larger than the outer diameter of the treatment tool, so when the treatment tool is inserted into channel a to perform treatment, the treatment tool is inserted into channel a. There was a problem in that it moved in the radial direction, making it difficult to aim at the target area. As a result, the treatment instrument may not be reliably guided to the target site, creating a dangerous situation, especially when a laser probe is used as the treatment instrument. In addition, when injecting a transparent liquid through channel a, such as in a vascular endoscope or biliary endoscope, the transparent liquid released from channel a causes the treatment instrument to move further in the radial direction. This made it extremely difficult to insert the treatment instrument.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to be able to reliably and easily guide a treatment instrument to a target site and to improve the insertability of the treatment instrument. Our goal is to provide endoscopes.

[Means and effects for solving the problems] In order to solve the above problems, the present invention provides a method for partially contacting the inner surface of a channel provided in the insertion section along the longitudinal direction with a treatment tool inserted therein. A guide protrusion is provided to restrict the radial movement of the treatment instrument relative to the channel. Therefore, the treatment instrument is guided in the desired direction along the guide protrusion,
The operator can reliably and easily guide the treatment instrument to the target site.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 4 shows the entire endoscope, and 1 is an operating section. An insertion section 4 comprising a distal end component 3 provided at the distal end of a flexible tube 2 is connected to the distal end of the operating section 1, and an eyepiece section 5 is provided at the rear end. In addition, the operation section 1
A universal cord 6 is connected to the universal cord 6, and a connector (not shown) is connected to the tip of the universal cord 6. Further, the operating section 1 is provided with a treatment instrument insertion lower, and the distal end component 3 is provided with a treatment instrument outlet 8 (for example, a seventh
(see figure). The treatment instrument insertion lower and the treatment instrument outlet 8 are communicated via a channel 9. That is, a channel 9 is provided in the insertion section 4 along the longitudinal direction, and a sheath 10 of the laser probe as a device consisting of a treatment instrument insertion lower
(made of Teflon) is led out of the insertion section 4 through the treatment instrument outlet 8. The inner diameter of this channel 9 is significantly larger than the outer diameter of the sheath 10. Further, inside the insertion section 4, an image guide fiber 11 communicating with the eyepiece section 5 and a light guide fiber 12, 12 communicating with the universal cord 6 are provided.

As shown in FIG. 1, a plurality of guide protrusions 13 are integrally provided on the inner wall surface of the channel 9 excluding the end on the side of the operating section 1 toward the center of the channel 9. . In other words, the cross-sectional shape of the end of the channel 9 on the operating section 1 side is circular, but the guide protrusions 13 are provided in other parts. These guide protrusions 13... have appropriate elasticity, and their tips partially contact the outer peripheral surface of the sheath 10 inserted into the channel 9, causing them to be slightly elastically deformed. . In addition, the protrusion length of these guide protrusions 13... is the same as that of the sheath 1.
The dimensions are set appropriately so that there is no large resistance when inserting and removing the 0.

2 and 3 show the inside of the operating section 1, and 14 is an inner cylinder. A notch 15 is provided on the upper surface of the middle part of the inner cylinder 14, and a locking part 17 of a connecting block 16 is placed on the left and right edges of the notch 15.
and the connecting block 16 are fixed by a set screw 18. Therefore, the connecting block 16 has a set screw 18
Even if it becomes loose, it will not move relative to the inner cylinder 14 as much as possible. In addition, the rear end of the channel 9 is connected to the operation section 1.
This extends to the inside, and is fitted on the outside of the Taber base 19, and further the Taber tube 20 is fitted on the outside. Then, by screwing the presser member 21 fitted on the outside of the tapered pipe 20 into the outer periphery of one of the connection ports 22 of the connection block 16, the taper base 19 and the tapered pipe 20 are connected to each other.
The channel 9 is sandwiched between them, and the channel 9 is fluid-tightly connected to the connection block 16. At this time, the taper cap 19 is fixed to the connection block 16 by screwing and using an adhesive.
An adhesive reservoir 23 is provided between the connecting block 9 and the connecting block 16, and is filled with adhesive. therefore,
The taper cap 19 is more firmly fixed, and the liquid tightness between the taper cap 19 and the connection block 16 is improved.

On the other hand, a channel base 25 is connected to the other connection port 24 of the connection block 16.

That is, the locking groove 2 is provided on the upper surface of the rear end of the connection block 16.
6 is provided, and a locking protrusion 27 that engages with the locking groove 26 is provided on a portion of one end side of the channel cap 25.
is provided. Then, one end of the channel cap 25 is inserted into the insertion port 29 provided on the upper surface of the middle part of the exterior cylinder 28 that constitutes the outer shell of the operating section 1, and the insertion tip is inserted into the slanted surface of the connection block 16. Recess 3 provided in 30
1, and the locking protrusion 27 is engaged with the locking groove 26. Next, by screwing the fixing nut 32 fitted on the outer periphery of the other end of the channel cap 25 into the inner periphery of the insertion opening portion 29, the channel cap 25 is pressed against the connection block 16 via the hook portion 33 and fixed. ing. At this time, since the locking protrusion 27 of the channel cap 25 is engaged with the locking groove 26 of the connection block 16, rotation of the channel cap 25 is restricted. Also,
An O-ring 34 is provided between the end surface of the channel cap 25 and the inclined surface 30 of the connection block 16, and a protrusion 35 is provided on the peripheral edge of the end surface of the channel cap 25. Channel base 2 by 35
5 is pressed against the connection block 16, the O-ring 34
Even if it is crushed, it will not protrude in the outer diameter direction. Further, a spring washer 36 is provided between the fixing nut 32 and the hooking portion 33 of the channel cap 25, and the elastic biasing force of the spring washer 36 prevents the fixing nut 32 from loosening as much as possible. . The exterior cylinder 28 is made of plastic or the like, and its inner wall surface is provided with a plurality of ribs 37 along the longitudinal direction to increase its strength. Note that 38 is an O-ring for ensuring liquid tightness between the channel base 25 and the insertion opening portion 29.

Furthermore, a fitting recess 39 is provided at the other end of the channel cap 25, into which a bend preventing member 40 made of an elastic material such as rubber is removably fitted. This anti-bending member 40 prevents the sheath 10 of the laser probe, which has relatively low strength, from being bent and broken. Note that the inner surface of the other end of the channel cap 25 is formed into a Luer tapered shape so that a syringe or the like can be fitted therein.

Thus, in the endoscope having such a configuration, after the insertion portion 4 is inserted into the body cavity, for example, the sheath 10 of a laser probe is inserted from the treatment instrument insertion lower, and the sheath 10 of the laser probe is inserted through the channel 9 to form the distal end. The treatment instrument can be led out into the body cavity from the treatment instrument outlet 8 of the section 3 . At this time, the sheath 10 is guided out while slidingly contacting the tips of the guide protrusions 13 provided on the inner wall surface of the channel 9. Therefore, even if the inner diameter of the channel 9 is made significantly larger than the outer diameter of the sheath 10, Regardless, movement of the sheath 10 in the radial direction is restricted. In other words, the sheath 10 has each guide protrusion 1
3... in a desired direction, so that the sheath 10 can be reliably guided to the target area.

Therefore, even when using, for example, a laser probe as a treatment tool, the affected area can be safely treated.

FIG. 5 shows a second embodiment of the invention. In this embodiment, an insertion section 4 is formed by integrally molding a tube having a plurality of holes with a synthetic resin or the like, one of the holes is used as a channel 9, and the other holes are provided with an image guide fiber 1.
1. Built-in components such as light guide lights μ12, 12 are installed inside the channel 9, and a plurality of guide protrusions 13 are integrally provided on the inner wall surface of the channel 9. The other configurations are the same as those of the first embodiment, and the operations and effects are also the same.

FIG. 6 shows a third embodiment of the invention. Similar to the second embodiment, this embodiment also has two holes (one in the shape of a crescent).
The insertion part 4 is formed by integrally molding a tube with a synthetic resin or the like, and a crescent-shaped hole in the insertion part 4 is used as a channel 9, and a light guide fiber 12 is inserted into the other hole.
and an image guide fiber 11 are installed on a concentric axis,
Further, a guide protrusion 42 having an arcuate contact portion 41 is provided, which integrally projects from a part of the inner wall surface of the channel 9 toward the inner wall surface opposite thereto. The other configurations are the same as those of the first embodiment, and the operations and effects are also the same.

Note that the present invention is not limited to the above embodiments. For example, in the first embodiment, the channel and the channel cap are connected by a connecting block and the channel is used exclusively for inserting the treatment instrument, but instead of this connecting block, a three-way pipe joint that branches in three directions is used. In addition to inserting a treatment instrument into the channel, one of the connection ports may be used to perform air supply, liquid supply, or suction. Further, in addition to being provided over the entire length of the channel as in each of the above embodiments, the guide protrusion may be provided only on at least a portion of the tip side of the channel, or may be provided piecemeal along the longitudinal direction of the channel. good. Furthermore, when inserting a treatment instrument with a smaller outer diameter or when the protruding length of the guide protrusion is shortened, the tips of all guide protrusions do not always contact the treatment instrument, and the treatment instrument is Even if the treatment instrument is brought into contact only when it is about to swing, the treatment instrument can be guided in the desired direction.

In this case, the amount of supernatural power of the treatment tool can be particularly reduced. It goes without saying that various other modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As explained above, according to the present invention, since the guide protrusion is provided on the inner surface of the channel to restrict the radial movement of the treatment instrument inserted therein, the treatment instrument is guided in the desired direction along the guide protrusion. Therefore, the operator can easily aim and guide the treatment instrument toward the target area, and can perform the treatment easily and safely. In addition, when using a channel through which a treatment instrument can be inserted as well as through which a transparent liquid such as physiological saline can be injected into the body cavity, the treatment instrument can be inserted while ensuring the gap between each guide protrusion as a flow path for the transparent liquid. can be guided in the desired direction,
Moreover, it is possible to prevent the problem that the treatment instrument becomes easier to move in the radial direction due to the transparent liquid discharged from the channel. Furthermore, when performing a biopsy using biopsy forceps as a treatment tool or puncturing a hypodermic needle, even if the tip of the treatment tool is pressed against the mucosal wall in the body cavity, the treatment tool will not bend within the channel. Therefore, force can be effectively applied to the mucous membrane wall and the like.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a sectional view of the insertion section, FIG. 2 is a sectional view showing the schematic structure inside the operating section, and FIG. View from middle A side, 4th
The figure is a side view showing the entire endoscope, and FIG.
FIG. 6 is a sectional view of the insertion portion showing the third embodiment of the present invention.
FIG. 7 is a cross-sectional view of the insertion portion showing the embodiment, and FIG. 7 is a perspective view of the tip of the insertion portion showing the conventional example. 4... Insertion part, 9... Channel, 10... Sheath, 13.42... Guide protrusion. Applicant's Representative Patent Attorney Atsushi Tsuboi

Claims (1)

[Claims] In an endoscope in which a channel for passing at least a treatment instrument through the insertion portion is provided along the longitudinal direction, an inner surface of at least a portion of the distal end side of the channel is partially contacted with the treatment instrument inserted through the channel. An endoscope, characterized in that it is provided with a guide protrusion that restricts the radial movement of a treatment instrument with respect to the channel.