JP4475732B2 - The tip of a side-viewing endoscope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a distal end portion of a side-view type endoscope in which an observation window is provided on a side surface of a distal end portion of an insertion portion.
[0002]
[Prior art]
In a side-view type endoscope, generally, one side surface of a distal end portion body provided at the distal end of an insertion portion is formed in a flat cut shape, and an observation window and an illumination window are arranged side by side on the plane portion. Has been placed.
[0003]
[Problems to be solved by the invention]
However, when the observation window is arranged in the plane portion formed on the side surface of the distal end portion of the insertion portion, for example, when passing the esophagus to insert the endoscope into the stomach, the observation window Tends to be in close contact with the esophageal mucosa surface.
[0004]
As a result, the surgeon cannot grasp the state around the distal end of the insertion portion of the endoscope, and there is a concern that the endoscope may be inserted by intuition and cause perforation or bleeding. . This is not limited to the esophagus and can always occur while a side-viewing endoscope is being inserted into a thin tubular organ.
[0005]
Accordingly, an object of the present invention is to provide a distal end portion of a side-viewing endoscope in which a field of view is always ensured even while passing through a thin tubular organ so that an operator can grasp an insertion state. And
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the distal end portion of the side-viewing endoscope of the present invention has a distal end portion of the side-viewing endoscope in which an observation window and an illumination window are arranged on the side surface of the distal end portion of the insertion portion. The cross-sectional shape perpendicular to the axis of the distal end portion of the insertion portion is formed in a concave shape, and the surface of the observation window is disposed in the concave portion.
[0007]
In addition, a concave portion whose entire circumference is surrounded by a bank-like portion may be formed on the side surface of the distal end portion of the insertion portion, and the surface of the observation window may be disposed in the concave portion, and the height is about the same as the bank-like portion. The surface of the illumination window may be arranged.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the invention will be described with reference to the drawings.
FIG. 2 is a plan view of the distal end portion of the side-view type endoscope, and FIG. 3 is a side cross-sectional view (III-III cross-sectional view in FIG. 2).
[0009]
In the figure, reference numeral 1 denotes a tip body made of a metal such as stainless steel, for example, and is connected to the tip of a bending portion 2 formed at the tip portion of a flexible endoscope insertion portion. Reference numeral 3 denotes a flexible rubber tube that covers the curved portion 2.
[0010]
The tip portion main body 1 is formed in a shape in which one side surface of a round bar-shaped material is partly flattened, and an observation window 4, an illumination window 5, and a treatment instrument protrusion 8 are provided on the flat portion 21. ing.
[0011]
The tip main body 1 is made of a resilient elastic material such as fluorine rubber so that the portions other than the observation window 4, the illumination window 5, and the treatment instrument protrusion 8 are not exposed. Covered by a cap 30.
[0012]
A treatment instrument raising piece 9 that is rocked by remote operation is accommodated inside the treatment instrument protrusion 8, and a distal end opening of a treatment instrument insertion channel (not shown) is disposed in the back thereof.
[0013]
As shown in FIG. 3, a light distribution lens 13 made of a concave lens for spreading the illumination light is joined to the illumination window 5 so as to be substantially the same surface as the flat portion 21, and just inside the light distribution lens 13. The exit end of the illumination light guide fiber bundle 14 is disposed.
[0014]
A cover lens 15 of the observation optical system is joined to the observation window 4 so as to be substantially the same surface as the flat portion 21, and a prism 16 that bends the observation optical axis at a right angle is disposed immediately inside the cover lens 15. Behind the prism 16, objective lenses 18 are arranged in a lens frame 17.
[0015]
Then, an image receiving surface of a solid-state image pickup device 19 made of, for example, a charge coupled device (CCD) is arranged at an object imaging position by the objective lens 18..., And a signal cable 20 extends backward therefrom.
[0016]
The front end of the air supply passage 25 and the front end of the water supply passage 26 are opened on the slope that follows the rear end of the flat surface portion 21 of the tip body 1, and the air supply passage 25 and the water supply passage 26 include an air supply pipe. 23 and the water pipe 24 are connected from the rear. The air supply passage 25 and the water supply passage 26 communicate with a nozzle 37 formed in the tip cap 30 toward the observation window 4.
[0017]
On the inner peripheral surface on the rear end opening side of the front end cap 30 formed in a cap shape, a circumferential projection 32 is formed protruding inward. On the other hand, a circumferential groove 7 is formed on the outer peripheral surface of the circular cross-section portion behind the illumination window 5, the observation window 4, and the like in the distal end main body 1.
[0018]
The distal end cap 30 is attached from the front side so as to cover the distal end portion main body 1 while being spread, and the distal end cap 30 is fitted into the circumferential groove 7 so that the distal end cap 30 is fitted to the distal end portion main body 1. It is fixed so that it cannot be removed.
[0019]
Further, as shown in FIG. 3, the distal end surface portion of the distal end portion main body 1 is formed with a concave portion 11 having a V-shaped cross section viewed from the side and opening in the direction of the flat portion 21. A convex portion 33 formed on the inner surface portion on the head side of the cap 30 is fitted into the concave portion 11 of the distal end portion main body 1 and locked. However, the tip cap 30 may be formed of a hard member and mechanically fixed to the tip portion main body 1.
[0020]
As shown in FIG. 4, which is a perspective view of the distal end portion of the side-view type endoscope, and FIG. 1 illustrating the II cross section (cross section perpendicular to the axis) in FIG. Both side portions are formed in a bank shape protruding from the flat portion 21 of the tip body 1 (bank portion 40), and the flat portion 21 of the tip portion body 1 is a recess sandwiched between the bank portions 40. Yes. In addition, since the plane part 21 is dented from the slope part adjacent to the back, the plane part 21 is a recessed part by which only the front end side was open | released.
[0021]
As a result, when the distal end portion of the side-viewing endoscope passes through a thin luminal organ such as the esophagus, the bank-like portion 40 contacts the mucosal surface as shown in FIG. The contact ensures a distance between the mucosal surface and the observation window 4, so that the field of view is always secured and the operator can grasp the surrounding state, and the side-viewing type internal view toward the stomach The tip of the mirror can be inserted safely.
[0022]
Further, as a side effect of the configuration as in this embodiment, as shown in FIG. 4, the air and water ejected from the nozzle 37 are guided by the bank-like portion 40 so as not to diffuse outward and are observed. The surface of the window 4 can be effectively cleaned.
[0023]
6, the first reference example of the side-viewing endoscope of the present invention shows a tip, in addition to the configuration of the real施例above, the bank-shaped portion 40 of the comparable height The tip-side bank-like portion 40 a is also formed on the tip portion of the tip cap 30. By comprising in this way, the plane part 21 turns into a recessed part surrounded by the perimeter, and space is ensured reliably between the observation window 4 and a mucous membrane surface.
[0024]
FIG. 7 shows the distal end portion of the side-view type endoscope of the second reference example of the present invention. In addition to the configuration of the first reference example described above, the surface of the illumination window 5 is observed on the observation window 4. It is formed so as to be higher than the surface of the rim and at the same height as the tip side bank 40a .
[0025]
【The invention's effect】
According to the present invention, a tube having a thin distal end portion of a side-viewing endoscope is formed by forming a cross-sectional shape perpendicular to the axis of the distal end portion of the insertion portion into a concave shape and disposing the surface of the observation window in the concave portion. The field of view is always secured even while passing through the hollow organ, so that the operator can grasp the insertion state, and the insertion operation can be performed safely.
[Brief description of the drawings]
FIG. 1 is a front sectional view (II sectional view in FIG. 3) of a distal end portion of a side-view type endoscope according to a first embodiment of the present invention.
FIG. 2 is a plan view of a distal end portion of the side-view type endoscope according to the first embodiment of the present invention.
FIG. 3 is a side cross-sectional view (III-III cross-sectional view in FIG. 2) of the distal end portion of the side-view type endoscope according to the first embodiment of the present invention.
FIG. 4 is a perspective view of the distal end portion of the side-view type endoscope according to the first embodiment of the present invention.
FIG. 5 is a schematic view showing a state in which the distal end portion of the side-view type endoscope according to the first embodiment of the present invention passes through a tubular organ.
FIG. 6 is a side cross-sectional view of the distal end portion of the side-view type endoscope according to the first reference example of the present invention.
FIG. 7 is a side sectional view of a distal end portion of a side-view type endoscope according to a second reference example of the present invention.
[Explanation of symbols]
1 Tip Body 4 Observation Window 5 Illumination Window 21
30 Tip cap 40 Bank-like portion 40a Tip-side bank-like portion

Claims (1)

At the distal end portion of the side-view type endoscope in which the observation window and the illumination window are arranged on the side surface of the distal end portion of the insertion portion,
The cross-sectional shape perpendicular to the axis of the distal end portion of the insertion portion is formed in a concave shape that is continuous to the leading end, and each of the surface of the observation window and the illumination window is arranged in a plane portion corresponding to the bottom surface of the recess, A nozzle for ejecting water toward the surface of the observation window is arranged forward on the rear end side of the recess ,
The distal end portion of the side-view type endoscope, wherein the side wall portion of the concave portion is formed by raising the outer wall portion of the distal end portion of the insertion portion in a bank shape .

Images