JP3091274B2 - Side-view electronic endoscope that can insert a treatment tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side-view type electronic endoscope into which a treatment tool can be inserted, and more particularly to a configuration of a side-view type electronic endoscope which guides a treatment tool led to a distal end portion toward a side of the endoscope. .

[0002]

2. Description of the Related Art A CCD (Charge Cou) which is a solid-state image sensor is used.
2. Description of the Related Art An electronic endoscope having a pled device at its distal end is well known. This electronic endoscope not only observes the state of the inside of an object to be observed, but also performs incision, biopsy, and recovery using various treatment tools such as forceps. And other measures have been taken.

FIG. 2 shows a structure of a distal end portion of a conventional side-view type electronic endoscope.
A forceps port 3, an observation window 4, an irradiation window (not shown), and the like, which are communicated with the treatment instrument insertion channel 2, are provided on a side surface of the endoscope distal end 1, not on a front side thereof. In the observation window 4,
The CCD 6 is connected via the optical lens 5. Therefore, it is possible to observe and treat a portion existing in a direction perpendicular to the insertion direction of the endoscope.

[0004] Also, on the side surface of the endoscope distal end 1,
As shown, the upright 7 that rotates in the direction of the forceps port 3 is
a, and a wire 8 connected to the operation unit is connected to the stand 7. Therefore, this wire 8
When the pulling operation is performed, the upright stand 7 is rotated, and the rotating upright stand 7 can raise the treatment tool 9 drawn out from the forceps port 3 to a predetermined position as shown by a chain line. Examples of the treatment tool 9 include biopsy forceps,
There are scissors forceps, a high-frequency knife, a high-frequency snare, a high-frequency hemostatic device, a cytodiagnosis brush, an injection needle, and the like. Various treatments are performed by bending the treatment tool 9 while observing the image formed by the CCD 6. Done.

[0005]

However, in the conventional endoscope, as shown in FIG. 2A, the inclination of the passage of the forceps port 3 communicating with the treatment instrument insertion channel 2 is increased by the presence of the CCD 6. Since the forceps port 3 cannot be taken and the forceps port 3 is formed to be gently inclined, there is a problem that the radius of curvature and the bending angle of the treatment tool 9 cannot be increased. That is, the observation window 4 to which the CCD 6 is connected and the forceps port 3 which is an exit passage of the treatment tool 9 must be arranged close to each other in view of performing a treatment while observing the affected part. The inclination of the forceps port 3 is determined in consideration of the above. However, conventionally, FIG.
As shown in FIG. 3, the CCD 6 is connected to the treatment instrument insertion channel 2.
Is disposed in an upper region of the endoscope, which is a passing region of
Due to the presence of the CD 6, the above-mentioned inclination was limited, and the radius of curvature and the bending angle of the treatment instrument 9 could not be increased.

The treatment area of the treatment tool 9 is related to how far the treatment tool 9 can be bent by the upright stand 7.
If the bending angle of the treatment tool 9 can be increased, the treatment area is also widened, and a user-friendly endoscope can be obtained. Further, if the treatment tool 9 can be bent with a large radius of curvature, there is an advantage that the load on the treatment tool 9 is reduced, the functional operation of the treatment tool 9 is not hindered, and the life is extended.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a side-view endoscope capable of inserting a treatment tool capable of increasing a radius of curvature and a bending angle of a treatment tool to be bent. To provide.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an observation window and a treatment tool on a side surface of a distal end portion of an endoscope.
An insertion channel outlet is juxtaposed, and the outlet is inserted through this observation window.
In a side-view type electronic endoscope for imaging an observation object with a solid-state imaging device , the solid-state imaging device is provided with an object with respect to the observation window.
Along with the lens system and optical path changing means,
It is arranged in series in the vertical direction, and its imaging surface is
On the side of the tip of the observation window and the outlet of the treatment instrument insertion channel
Almost perpendicular to the longitudinal direction of the tip
And the outlet passage of the treatment instrument insertion channel is curved in a direction substantially parallel to the imaging surface of the solid-state imaging device .

[0009]

According to the above construction, the solid-state imaging device is arranged perpendicular to the side surface of the outlet, so that the treatment instrument insertion channel can pass through the solid-state imaging device while avoiding the solid-state imaging device, and the exit passage has a large curvature. It becomes possible. Therefore, the treatment tool inserted into the outlet passage can be largely curved.

[0010]

FIG. 1 shows a configuration of a treatment instrument insertion type side-view type endoscope according to an embodiment, and FIG. 1 (a) shows an endoscope end portion with an observation window (left side) and an endoscope. FIG. 2B is a cross-sectional view of a main part taken along a forceps opening (right side), and FIG. 2B is a side cross-sectional view of the endoscope in FIG. As shown in the drawing, an observation window 11 is provided below the distal end portion 10, and a forceps port 12 is formed facing downward, and the lower surface of the forceps port 12 is an outlet side surface A. An objective lens 13 is connected to the observation window 11, and a CCD 15, which is a solid-state image sensor, is connected to the objective lens 13 via a prism 14. In the embodiment, the forceps port 12 functions as an exit passage of the treatment tool insertion channel 16, and the CCD 15 attached via the prism 14 has its element surface arranged perpendicular to the exit side surface A. Will be. Therefore, the observation window 11,
The optical axis of the objective lens 13 is bent 90 degrees by the prism 14, whereby an image of the object to be observed can be formed on the image area of the CCD 15.

In the embodiment, since the CCD 15 is provided perpendicularly to the exit side surface A, an empty area is formed at the upper right of the figure. Therefore, as shown in FIG. The forceps port 12 is connected to the treatment instrument insertion channel 16 in a direction substantially parallel to the element surface of the CCD 15 and is bent at a large bending angle.

As shown in FIG. 1 (b), an upright 18 is attached to the shaft pin 1 in the direction of the tip near the forceps port 12.
9, a wire 20 is attached to the stand 18, and by operating the wire 20, the stand 18 can be turned to the position of the chain line 100. Therefore, the treatment instrument 9 drawn out from the forceps port 12 can be raised up to the position indicated by the dashed line by the rotation of the raising stand 18. Although not shown, a forceps insertion port communicating with the treatment tool insertion channel 16 is provided in a support portion of the endoscope, and an operation portion provided in the support portion is provided with an upright stand 18 by the wire 20. An upright knob for operating is provided.

The embodiment has the above-described configuration. In the electronic endoscope, the treatment tool 9 for performing various treatments while observing the image of the inside of the body observed through the observation window 11 is connected to the treatment tool insertion channel 16. It is introduced into the forceps port 12 which is an exit passage through the port. In the forceps port 12, when the treatment tool 9 jumps out of the outlet of the forceps port 12, the user operates the upright knob to pull the upright table 18 to the position of the chain line 100. At this time, the treatment tool 9 is guided by the largely curved forceps port 12 and bends, so that the treatment tool 9 can be raised up to the position shown by the chain line in the figure. When FIG. 1B is compared with the conventional FIG. 2A, it is understood that the bending angle of the treatment tool 9 is significantly larger than the conventional one. If the bending is not performed to the end, the treatment tool 9 is bent with a large radius of curvature, so that no extra load is applied to the treatment tool 9 itself.

In the above embodiment, the cross-sectional shape of the forceps opening 12 may be a vertically long circular shape (an elliptical shape is also possible). In this case, there is an advantage that the radius of curvature and the bending angle of the treatment instrument 9 can be easily taken.

[0015]

As described above, according to the present invention,
Change the objective lens system and optical path of the solid-state image sensor to the observation window
With the means in series in a direction substantially perpendicular to the longitudinal direction of the tip
And its imaging surface is almost
Vertically and almost parallel to the longitudinal direction of the tip
In addition, since the exit passage of the treatment instrument insertion channel is formed to be curved substantially in parallel with the imaging surface , the exit passage can be largely curved, and therefore, the bending angle of the treatment instrument can be made large.

Further, since the load applied to the treatment instrument itself can be reduced, the life of the treatment instrument can be extended without impairing the function of the treatment instrument.

[Brief description of the drawings]

FIG. 1 is a view showing a configuration of a side-view type endoscope into which a treatment tool according to an embodiment of the present invention can be inserted, wherein FIG. It is a side sectional view of the endoscope of (a).

2A and 2B are diagrams showing a configuration of a distal end portion of a conventional electronic endoscope, in which FIG. 2A is a side cross-sectional view, and FIG.
FIG. 3 is a cross-sectional view of the endoscope taken along line BB.

[Explanation of symbols]

 1,10: tip, 2,16 ... treatment instrument insertion channel, 3,12 ... forceps port, 7, 18 ... stand, 9 ... treatment instrument, 14 ... prism, 15 ... CCD, A ... exit side surface.

Claims (1)

(57) [Claims] (1)Observation window and treatment tool on the side of the endoscope tip
An insertion channel outlet is juxtaposed, and the outlet is inserted through this observation window.
Image the observation object with a solid-state image sensorSide-view electronic endoscope
AtThe solid-state imaging device is connected to the observation window with an objective lens system and
Direction almost perpendicular to the longitudinal direction of the tip with the light path changing means
Are arranged in series and the imaging surface is
And the treatment tool insertion channel exit
Vertical and substantially parallel to the longitudinal direction of the tip
Attached to the above The exit passage of the treatment instrument insertion channel isSolid-state image sensor
Child imaging surfaceIt is characterized by being curved in the plane direction almost parallel to
Side-view type electronic endoscope into which a treatment tool can be inserted.