JPH0416645Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an endoscope equipped with a treatment tool guide for guiding treatment tools such as catheters and forceps.

[Prior Art] In order to guide the tip of a treatment tool such as a catheter or forceps inserted through the treatment tool channel of an endoscope to a desired site in the body cavity, a storage chamber is formed at the tip of the insertion section, and this storage chamber is inserted into the treatment tool channel of an endoscope. A device is known in which a treatment instrument guide is provided in a chamber so that it can be raised and lowered. Furthermore, an objective lens and an illumination lens are provided at the distal end of the insertion section near the storage chamber. Then, the inside of the body cavity is illuminated with the illumination light emitted from this illumination lens,
The treatment instrument is guided to the target site while observing the inside of the body cavity through the objective lens.

It is desirable that the distal end of the insertion section has a small diameter in order to ease insertion, ease of operation, and reduce pain to the patient. On the other hand, one end of the treatment instrument guide is pivotally connected by a support shaft, and the other end is connected to an operating wire. If the distance between the support shaft and the connecting end of the operating wire is shortened, a large operating force will be required to raise the treatment instrument guide, so the distance must be increased. Then, the treatment instrument inductor must be made larger. If the treatment instrument guide is made larger and the distal end portion of the insertion portion is made smaller in diameter, it is inevitable that a portion of the treatment instrument guide protrudes from the storage chamber when the treatment instrument guide is erected.

[Problems to be solved by the invention] In this way, when the treatment instrument guide is erected, if a part of it protrudes from the accommodation chamber, the illumination emitted from the illumination lens at the protruding part Light may be reflected and the reflected light may enter the objective lens and cause flare, making observation difficult. In addition, especially when the insertion tube is inserted into a body cavity and liquid in the body cavity or cleaning liquid adheres to the objective lens or its vicinity, the optical path of the illumination light reflected by the treatment instrument guide will change due to the liquid. However, flare was likely to occur. This idea was developed based on the above circumstances, and its purpose was to prevent the illumination light emitted from the illumination lens from being reflected by the treatment instrument guide. An object of the present invention is to provide an endoscope that prevents the occurrence of flare.

[Means and effects for solving the problem] In order to solve the above problem, this invention provides an objective lens and an illumination lens at the distal end of the insertion section, and also houses a treatment tool guide so that it can be raised and lowered. In the endoscope, in which a treatment instrument guide is raised and lowered by pushing and pulling an operation wire, at least a portion of the treatment instrument guide that protrudes from the accommodation chamber when raised is Formed in a low reflection area where illumination light emitted from the illumination lens is unlikely to be reflected. Then, the light emitted from the illumination lens is prevented from being reflected by the treatment instrument guide and entering the objective lens.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings. FIG. 3 shows the distal end component 2 of the distal end of the insertion section 1 of the endoscope. The main body 3 forming the tip component 2 has a flat part 4, and this flat part 4 is exposed to the outside. In addition, an objective lens 5 is provided on the plane portion 4.
and an illumination lens 6 are provided along the axial direction, and a storage chamber 7 is opened on the side thereof, and a cleaning liquid is supplied to the base end side of the illumination lens 6 to connect the objective lens 5 and the illumination. A nozzle 8 is provided to eject water toward the lens 6.

As shown in FIG. 2, a lens group 12 held in a lens frame 11 through a prism 9 faces a portion of the main body 3 that faces the objective lens 5. As shown in FIG. A solid-state image sensor 13 is disposed facing the lens group 12, and signals input to the solid-state image sensor 13 are sent to a monitor (not shown) via a signal cable 14 connected to the solid-state image sensor 13. There is. Therefore, the light image incident on the objective lens 5 can be observed on the monitor. The tip of the light guide fiber 15 faces a portion of the main body 3 that faces the illumination lens 6. The base end of the light guide fiber 15 is connected to a light source unit (none of which is shown) via a universal cord connected to an operation section (not shown). Therefore, the illumination light output from this light source unit passes through the light guide fiber 15 and is emitted from the illumination lens 6 whose tip is opposed.

As shown in FIGS. 1 and 4, a treatment instrument guide 16 having a substantially right-angled triangular side surface is accommodated in the accommodation chamber 7 formed in the main body 3, and one end of the treatment instrument guide 16 is connected to a support shaft 17. It is rotatably mounted.
An attachment hole 18 is formed at the other end of the treatment instrument guide 16, into which a wire stopper 21 fixed to the tip of the operating wire 19 is attached by swaging. The proximal end of the operating wire 19 is guided to the operating section, where it can be pushed and pulled using a forceps lifting knob (not shown). Therefore, when the operating wire 19 is pulled by operating the forceps raising knob, the treatment instrument guide 16 can be raised as shown in FIGS. 1 and 4, and the operating wire 19 can be raised as shown in FIGS. By pushing in, the raised treatment instrument guide 16 can be brought down. Furthermore, the treatment instrument guide 16
A slope 22 is formed on the surface. This slope 22 guides the treatment instrument sent from the treatment instrument introduction hole 23 shown in FIG. 1 and leads it out to the outside. Note that the introduction hole 23 communicates with a treatment instrument insertion hole provided in an operation section (not shown).

When the treatment instrument guide 16 is erected, the treatment instrument guide 16 protrudes from the accommodation chamber 7,
Moreover, the side part located on the illumination lens 6 side is
The low reflection portion 24 is formed so that light is less likely to be reflected than other portions. The means for forming the low reflection portion 24 may include roughening the surface of the portion, applying a paint that does not reflect light such as black, or applying other surface treatments to lower the reflectance. You can also do this.

When using the endoscope configured as described above, first, illumination light is emitted from the illumination lens 6 to illuminate the inside of the body cavity, and while observing the illuminated area through the objective lens 5, an operation (not shown) is performed. Insert the treatment instrument through the treatment instrument insertion hole in the section. Then, insert the distal end of the treatment instrument from the introduction hole 23 into the slope 2 of the treatment instrument guide 16.
2 and protrude to the outside. At this time, the protruding direction of the treatment instrument is controlled by raising the treatment instrument guide 16, and the treatment instrument is guided in a desired direction to perform a treatment such as tissue removal.

During such treatment operations, the treatment instrument guide 16
When raised and a part of it protrudes outside from the storage chamber 7, the illumination light emitted from the illumination lens 6 is reflected by the side of the protruding part located on the illumination lens 6 side and enters the objective lens 5. This may cause flare. However, the side surface of the treatment instrument guide 16 that protrudes from the accommodation chamber 7 and is located on the illumination lens 6 side is formed into a low reflection portion 24 that hardly reflects illumination light. Therefore, since the illumination light emitted from the illumination lens 6 is hardly reflected on the side surface of the treatment instrument guide 16, it is possible to prevent flare from occurring and making observation through the objective lens difficult.

Furthermore, if the low reflection part 24 is formed with a rough surface, it becomes difficult for liquid, especially cleaning water sprayed from the nozzle 8, to adhere to that part, and the optical path is changed by water droplets, causing flare. It can also be prevented.

Note that this invention is not limited to the above-mentioned example,
For example, the low reflection part formed on the treatment instrument guide is not only a part of the side surface, but also the entire side surface on the illumination lens side, or if the endoscope is not a side-viewing type but a direct-viewing type,
The entire surface within the field of view may be a low reflection portion.

[Effect of idea]

As described above, in this invention, at least the portion of the treatment instrument guide that protrudes from the accommodation chamber when raised is formed into a low reflection portion where illumination light emitted from the illumination lens is unlikely to be reflected. Therefore, since the illumination light emitted from the illumination lens is not reflected by the treatment instrument guide and enters the objective lens, causing flare, observation through the objective lens can be performed satisfactorily. can.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, and FIG. 1 is a sectional view of the distal end of the insertion section along the axial direction, FIG. 2 is a sectional view of different parts along the same axial direction, and FIG. Top view of the tip, Figure 4 is Figure 3-
FIG. 5 is an enlarged sectional view taken along the line and a perspective view of the treatment instrument guide. 1... Insertion section, 5... Objective lens, 6... Illumination lens, 7... Accommodation chamber, 16... Treatment instrument guide,
19... Operation wire, 24... Low reflection section.

Claims (1)

[Scope of utility model registration request] An objective lens and an illumination lens are provided at the distal end of the insertion section, and a storage chamber is formed in which a treatment tool guide is accommodated in a manner that the treatment tool guide can be raised and lowered. In the mirror, at least a portion of the treatment instrument guide that protrudes from the accommodation chamber when raised is formed into a low reflection portion that hardly reflects illumination light emitted from the illumination lens. Endoscope.