JP2001228411A - Endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a front end optical adapter to the front end of an endoscope in the state of maintaining the deviation value in a rotating direction always constant in mounting the front end optical adapter. SOLUTION: When an adapter body 20 disposed at the front end optical adapter 2 is fitted to a front end member 11 disposed at the front end 10 of the endoscope, a positioning pin 21 projectingly disposed at the adapter body 20 engages into a positioning groove 32 formed at the front end member 11 and the movement in a rotating direction is regulated. An oblique part 12a formed at the free end of an elastic member 12 which is wound around the front end member 11 and is fixed at one end is pressed to the positioning pin 21 and is elastically deformed. The positioning pin 21 is fixed in the state of being pressed to the wall surface of the positioning groove 32 by the reaction thereof. Consequently, the deviation value in the rotating direction of the front end of the endoscope and the front end optical adapter is kept always constant without being affected by vibration, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope used by attaching a distal end optical adapter to a distal end portion of the endoscope.

[0002]

2. Description of the Related Art Conventionally, as an endoscope to which a tip optical adapter can be detachably attached to an endoscope end portion, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-31345, an adapter body is disclosed. An adapter attachment / detachment screw is provided, and a female screw at the inner diameter of the adapter attachment / detachment screw is screwed together with a male screw provided at the distal end of the endoscope. Generally, a positioning pin provided on a main body side of an endoscope is engaged with a positioning pin provided for positioning the endoscope and the distal end optical adapter.

Japanese Patent Application Laid-Open No. 6-130308 discloses a rotation regulating pin, an urging member for urging the rotation regulating pin, and a recess for locking the rotation regulating pin, instead of the positioning pin and the positioning groove. When the tip optical adapter is attached and detached, the rotation restricting pin is retracted, and when used after the tip optical adapter is attached, the rotation restricting pin is protruded by the urging force of the urging member. A technique for positioning the rotation direction between the endoscope and the endoscope is disclosed.

[0004]

However, Japanese Patent Application Laid-Open No. Hei 9-3
In Japanese Patent No. 1435, the movement in the axial direction can be restricted by tightening the mounting screw. However, there is a slight dimensional difference between the diameter of the positioning pin and the width of the positioning groove. It appears as a shift in the rotation direction between the optical adapter and the endoscope tip.

[0005] This displacement changes due to vibration or impact each time the tip optical adapter is attached / detached, or even after the tip optical adapter is attached. Therefore, as shown in FIG. α appears in the image.

On the other hand, in Japanese Unexamined Patent Publication No. Hei 6-130308, since the rotation restricting pin can be retracted and attached and detached at the time of attachment / detachment, the axial direction between the rotation restricting pin and the concave portion which is locked by the urging member at the time of use. Although it is possible to absorb even if there is a slight deviation in the positional relationship, there is a slight error between the diameter of the rotation regulating pin and the concave portion, and the deviation causes a deviation in the rotation direction, and The shift amount changes every time the device is mounted or under the influence of vibration after mounting.

When the amount of displacement in the rotation direction changes, for example, as disclosed in Japanese Patent Application Laid-Open No. H10-248806, when performing stereo length measurement using an endoscope, the amount of change in the measurement data calculation is calculated. Must be taken into account,
There are limits to obtaining more accurate measurement results.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an endoscope which can position the distal end optical adapter with respect to the endoscope distal end portion while always keeping the amount of displacement in the rotational direction constant. I have.

[0009]

In order to achieve the above object, an endoscope according to the present invention comprises an elastic member provided on one of a distal end portion of an endoscope and a distal end optical adapter mounted on the distal end portion of the endoscope. And a receiving portion for receiving the urging force from the elastic member is provided on the other side, and the rotational direction of the tip optical adapter is positioned by the urging force of the elastic member.

In such a configuration, an elastic member is disposed at one end of the endoscope or a distal end optical adapter attached to the distal end of the endoscope, and a receiving portion for receiving the elastic member is provided at the other end. Then, the distal end optical adapter is biased in the rotational direction by the biasing force of the elastic member to the distal end portion of the endoscope, and is positioned and fixed in such a manner that the displacement amount is always constant.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 16 show a first embodiment of the present invention. Here, FIG. 1 is a cross-sectional view showing a state in which a distal end optical adapter is attached to the endoscope distal end portion, FIG. 2 is a cross-sectional view of the endoscope distal end portion, and FIG. 3 is provided on the endoscope distal end portion and the distal end optical adapter. FIG. 4 is a sectional view of the tip optical adapter, and FIG. 5 is a sectional view taken along line VV of FIG.

As shown in FIG. 1, a distal end 10 of an endoscope 1 is provided.
, The tip optical adapter 2 is detachably attached. A mounting ring 68 is provided on the adapter body 20 provided at the base of the distal end optical adapter 2, and the mounting ring 68 is screwed around the distal end member 11 provided on the endoscope distal end portion 10. It is screwed into the screw portion 11a and fixed.

As shown in FIG. 4 and FIG.
8 is forward (leftward in FIG. 4) with respect to the adapter body 20
And is hooked in the middle of the adapter body 20. A retaining member 69 is attached to the front end of the adapter main body 20, and the retaining ring 69 prevents the attachment ring 68 from falling off. Retaining member 6
9 is screwed to the adapter body 20 and then its end is fixed to a recess 20a formed in the adapter body 20 by caulking.

The front optical adapter 2 is provided with a front frame 60, an intermediate frame 61, and a rear frame 62 in which an objective optical system lens and an illumination optical system lens are provided in order from the front to the rear. In addition, the adapter body 20 is integrally formed with the rear frame 62, and the front frame 60 and the intermediate frame 61 are fixedly secured via a fixing pin 63.

A gap 59 is formed on the joint surface between the front frame 60 and the intermediate frame 61 in order to obtain optical performance.
The joining surface between the front frame 60 and the intermediate frame 61 is a cylindrical member 64.
The cylindrical member 64 ensures the watertightness of the gap 59.

The cylindrical member 64 also has a function of preventing the fixing pin 63 from coming off. When the front frame 60 and the intermediate frame 61 are fixed by the fixing pin 63, the cylindrical member 64 must be fixed to the intermediate frame in advance. 61 is retracted to the proximal end side, and after the fixing pin 63 is attached, it is moved to the distal end side so that the front frame 60 and the intermediate frame 61
After covering the joint surface with the substrate, they are bonded.

On the other hand, as shown in FIG. 2, a groove 31 is formed in the outer periphery of the tip member 11 along the circumferential direction, and a positioning groove 32 having a predetermined depth as a receiving portion is formed along the axial direction. It is formed.

Further, as shown in FIG.
1 is formed in a D-shape in which a portion provided with the positioning groove 32 is cut out, while the inner peripheral surface of the adapter body 20 fitted to the tip member 11 is also a D-shape. Is formed.

An elastic member 12 formed by bending a flat plate having a substantially rectangular cross section and having elasticity is mounted in the groove 31. The elastic member 12 is not limited to a metal such as stainless steel, spring stainless steel, phosphor bronze, a superelastic alloy, or a resin such as ABS, methacryl, or polycarbonate, but may be another material.

One end of the elastic member 12 is fixed to the groove 31,
The other end is a free end, and an obliquely cut portion 12a is formed at the free end.
Project into the positioning groove 32.

The adapter body 2 of the tip optical adapter 2
At 0, the positioning pin 21 engaged in the positioning groove 32 formed in the tip member 11 is fixed in a state of protruding inward.

Next, the operation of the present embodiment having the above configuration will be described. An inner periphery of an adapter main body 20 provided at a rear portion of the distal end optical adapter 2;
Is formed in a D-shape that can be complemented with the outer periphery of the tip member 11 provided in the first member.

The adapter body 20 and the tip member 11
When this is further engaged, the positioning pin 21 protruding inward of the adapter body 20 is engaged with the positioning groove 32 formed at the end of the tip member 11, as shown in FIG. When the positioning pin 21 engages with the positioning groove 32 by a predetermined amount or more, the positioning pin 21 engages with the inclined portion 12a formed at one end of the elastic member 12, and then further engages. It retracts while being elastically deformed, and the reaction force urges the positioning pin 21 in one of the rotation directions.

The positioning pin 21 is constantly pressed and fixed in a fixed direction against the positioning groove 32 by the urging force of the elastic member 12, so that the displacement α (see FIG. 42) appearing on the image is It is always constant without being affected.

At the same time, the adapter body 20 of the tip optical adapter 2 is fitted to the tip member 11, and in this state, the mounting ring 68 provided on the adapter body 20 of the tip optical adapter 2 is rotated to The distal end optical adapter 2 is fixed to the distal end portion 10 of the endoscope by being screwed into a screw portion 11 a screwed around the outer periphery of the member 11.

As described above, according to the present embodiment, when the distal end optical adapter 2 is mounted on the endoscope distal end portion 10, the positioning pins 21 provided on the distal end optical adapter 2 are provided.
Is engaged in the positioning groove 32 formed in the endoscope distal end portion 10, the positioning pin 21 receives the urging force of the elastic member 12, and is pressed and fixed to the rotation direction side surface of the positioning groove 32. Therefore, since the distal end optical adapter 2 is always pressed against and fixed to the endoscope distal end portion 10 in a fixed direction, the shift amount α (see FIG. 42) appearing on the image is always constant.

As a result, it is not necessary to correct the displacement between the distal end optical adapter 2 and the endoscope distal end portion 10 in the image processing when measuring the object to be measured using the distal end optical adapter 2, and high accuracy is achieved. Measurement results can be obtained.

As shown in FIGS. 6 and 7, a retaining member 69 provided at the distal end of the tip optical adapter 2 for retaining the mounting ring 68 is screwed onto the adapter body 20. You may make it fix by the screw 70 inserted.

That is, at the time of assembly, the screw 70 is screwed into the adapter body 20 in advance, and then the retaining member 69 is screwed to the adapter body 20. After that, a driver is inserted through a through hole 69 a having a diameter smaller than the diameter of the screw 70 formed in the retaining member 69, and the screw 7 is inserted.
0 to the outer peripheral direction, the head of the screw 70 is projected to the inner peripheral surface of the retaining member 69, and the head of the screw 70 is pressed against the inner peripheral surface of the retaining member 69, or the retaining member 69 is The retaining member 69 may be fixed so as not to rotate by rotating in the removing direction and engaging the screw portion with the screw 70.

Alternatively, as shown in FIG.
After the retaining member 69 is screwed into the through hole 0, the male screw 20b of the adapter body 20 is crushed through a through hole 69b formed in the retaining member 69, and the retaining member 69 is fixed by not rotating. You may do it.

Alternatively, as shown in FIG.
After the retaining member 69 is screwed into the adapter body 20, the end of the retaining member 69 may be fixed by caulking the concave portion 20 a formed in the adapter body 20. In this case,
By filling the recess 20a with an elastic member 71 such as rubber in advance or after caulking, it is possible to prevent the retaining member 69 from rattling.

Alternatively, as shown in FIGS. 10 and 11, after the retaining member 69 is screwed to the adapter main body 20, an end portion 69c of the retaining member 69 on which the inner peripheral thread is not screwed is screwed.
May be fixed to the adapter body 20 by caulking the adapter body 20.

Alternatively, as shown in FIGS. 12 to 14, the retaining member 69 may be attached and fixed to the adapter body 20 with one touch. That is, a protrusion 69d protruding toward the inner diameter side is formed on the front end surface of the retaining member 69, and one or a plurality of claws 69e capable of being elastically deformed in the radial direction by the positioning groove 32 are formed on the rear end surface. I do. A groove 20c is formed on the front end face of the adapter body 20 to engage with the projection 69d, and a recess 20d is formed on the outer periphery of the adapter body 20 for engaging the claw 69e.

When the retaining member 69 is attached to the adapter body 20 from the left side in FIG. 12 at the time of assembling the distal end optical adapter 2, the claw 69 e formed on the rear end surface of the retaining member 69 is turned on. It is elastically deformed and retracts in the outer diameter direction, and slides on the peripheral surface of the adapter body 20.

Then, the retaining member 69 is further moved, and the convex portion 69 formed on the distal end surface of the retaining member 69 is moved.
When d is fitted into the groove 20c formed on the front end face of the adapter body 20, the claw 69e formed on the rear end face is fitted into the recess 20d formed on the adapter body 20 and moves in the reciprocating direction. Is regulated, and at the same time, the retaining member 69
The protrusion 69d formed on the distal end surface of the adapter body is engaged with the groove 20c formed on the distal end surface of the adapter body 20 to restrict the movement in the rotation direction, and the retaining member 69 is fixed to the adapter body 20. You.

As shown in FIGS. 15 and 16, inside the distal end portion 10 of the endoscope, built-in components such as an image pickup device 76, a light guide 77 for illumination, etc. In order to protect from damage such as compression, the inside of the distal end member 11 may be filled with a reinforcing member 65 or a filler 66 having an effect of absorbing impact.

The filler 66 is preferably made of a material having flexibility, shock absorption, and electrical insulation, such as silicone rubber, silicone rubber-based adhesive, or foamable resin. Other materials may be used as long as they can be used.

(Second Embodiment) FIGS. 17 to 19 show a second embodiment of the present invention. Here, FIG. 17 is a cross-sectional view of the distal end portion of the endoscope, FIG. 18 is an enlarged view showing an engagement state between the distal end portion of the endoscope and a positioning pin provided on the distal end optical adapter, and FIG. FIG.

In the present embodiment, the elastic member 35 attached to the groove 31 formed in the circumferential direction of the distal end member 11 provided at the distal end portion of the endoscope has a resilient line having a substantially elliptical or substantially circular cross section. The elastic member 35 is formed by bending an elastic member (for example, a stainless steel wire for a spring or a piano wire). One end of the elastic member 35 is fixed to the groove 31 and the other end is a free end. A bent portion 35a is formed at the free end. The bent portion 35a faces the positioning groove 32 formed along the axial direction with its tip directed toward the bottom of the positioning groove 32.

When the distal end optical adapter is mounted on the endoscope distal end portion 10, the positioning pin 21 provided at the rear of the distal end optical adapter is engaged with the positioning groove 32 formed in the distal end member 11. , This positioning pin 21
Engages with a bent portion 35a formed at one end of the elastic member 35, and further engages with the elastic member 35.
The bent portion 35a is elastically deformed in the inserting direction of the positioning pin 21 while being retracted while being elastically deformed by being pressed.

The positioning pin 21 includes the elastic member 35 itself,
18 and the reaction force due to the elastic deformation of the bent portion 35a.
(B), as shown in FIG. 19, the positioning groove 32 is always pressed and fixed in a fixed direction. Therefore, the amount of displacement α in the rotation direction that appears in the image (see FIG. 42)
Is always constant without being affected by vibration or the like.

As described above, in this embodiment, since the positioning pin 21 is pressed by the biasing force of both the elastic member 35 itself and the bent portion 35a, the positioning pin 21 is obtained by obtaining a larger biasing force. It can be pressed against the positioning groove 32.

(Third Embodiment) FIGS. 20 and 21 show a third embodiment of the present invention. Here, FIG. 20 is a cross-sectional view of the distal end portion of the endoscope, and FIG. 21 is an enlarged view of a portion XXI in FIG.
In the above-described second embodiment, one end of the elastic member 35 is a fixed end, the other end is a free end, and the bent portion 35a formed at the free end is formed. Both ends of an elastic member 36 formed by bending a shape-like member are free ends, and bent portions 36a are formed at both ends.

The elastic member 36 is inserted into the groove 31 formed on the outer periphery of the distal end member 11 provided on the distal end portion 10 of the endoscope.
When attached to the bend, bent portions 36 formed by bending at both ends
a with respect to the positioning groove 32 formed in the tip member 11.
The front end faces toward the bottom of the positioning groove 32.

When the distal end optical adapter is attached to the endoscope distal end portion 10, the positioning pin 21 provided at the rear of the distal end optical adapter is engaged with the positioning groove 32 formed in the distal end member 11. When the positioning pin 21 is inserted, the positioning pin 21 engages with the bent portions 36a formed at both ends of the elastic member 36. When the positioning pin 21 further engages, the elastic member 36 is pressed by the positioning pin 21 and retracts while being elastically deformed. The bent portions 36a formed at both ends are
Elastically deforms in the insertion direction.

The positioning pin 21 includes the elastic member 36 itself,
21 and the reaction force due to the elastic deformation of the both bent portions 36a, as shown in FIG. 21, the positioning groove 32 is positioned at substantially the center of the positioning groove 32. 42) can always be fixed in a constant state without being affected by vibration or the like.

(Fourth Embodiment) FIGS. 22 and 23 show a fourth embodiment of the present invention. Here, FIG. 22 is a cross-sectional view of the distal end portion of the endoscope, and FIG. 23 is an enlarged view of a part XXIII in FIG. In the present embodiment, both ends of an elastic member 37 formed by bending an elastic flat plate are used as free ends, and inclined portions 37a are formed at both ends.

The elastic member 37 is inserted into the groove 31 formed on the outer periphery of the distal end member 11 provided on the distal end portion 10 of the endoscope.
When attached to the slanted portion 37a formed at both ends,
It is made to protrude from the positioning groove 32 formed in the tip member 11.

When the distal end optical adapter is attached to the endoscope distal end portion 10, the positioning pin 21 provided at the rear portion of the distal end optical adapter is engaged with the positioning groove 32 formed in the distal end member 11. When the positioning pin 21 is inserted, the oblique portions 3 formed at both ends of the elastic member 37
When the elastic member 37 is engaged and further engaged, it is retracted while being elastically deformed by being pressed by the positioning pin 21.

As a result, the positioning pin 21 is positioned and fixed substantially at the center of the positioning groove 32 as shown in FIG. 23 by the reaction force due to the elastic deformation of the elastic member 36.
Therefore, the shift amount α (see FIG. 42) in the rotation direction between the endoscope distal end portion 10 and the distal end optical adapter, which appears on the image, is always constant.

(Fifth Embodiment) FIGS. 24 and 25 show a fifth embodiment of the present invention. Here, FIG. 24 is an enlarged view showing an engagement state between the endoscope distal end portion and the distal end optical adapter, and FIG. 25 is a cross-sectional view taken along the line XXV-XXV of FIG.

In the present embodiment, as shown in FIG. 25, the elastic member 38 mounted on the groove 31 provided around the distal end member 11 provided on the endoscope distal end portion 10 has one end thereof. Are hooked and fixed to the tip member 11, and the other end is a free end.

At the free end, a bent portion 38a is formed which is bent in the outer peripheral direction with respect to the tip member 11.

On the other hand, a concave portion serving as a receiving portion is provided at a position corresponding to the bent portion 38a formed at one end of the elastic member 38 of the adapter body 20 provided at the rear portion of the tip optical adapter 2 (see FIG. 15 and the like). 30 is cut out in a triangular shape. An attachment ring (see FIG. 15 and the like) is provided on the outer periphery of the main body 20 to be screwed to the outer periphery of the distal end member 11 provided on the endoscope distal end portion 10.

As shown in FIG. 24A, the elastic member 38
Is bent in the free end side when the end is fixed to the groove 31 of the tip member 11 and one end is fixed.
The reference numeral 8a is disposed slightly offset from the bottom 30a of the recess 30 formed at the rear end of the adapter body 20.

When attaching the distal end optical adapter 2 to the endoscope distal end portion 10, the adapter body 20 provided at the rear of the distal end optical adapter 2 is connected to the endoscope distal end portion 1
The fitting body (not shown) is fitted to the distal end member 11 provided in a predetermined position, and then an attachment ring (not shown) is screwed to the distal end member 11 to gradually bring the adapter body 20 and the distal end member 11 closer to each other. Since the bent portion 38a formed at the end of the elastic member 38 is disposed slightly shifted from the bottom 30a of the concave portion 30 formed in the adapter body 20, the bent portion 38a Abuts on the tapered surface of the concave portion 30, and as the fitting amount between the adapter body 20 and the distal end member 11 increases, the bent portion 38a moves toward the bottom 30a of the concave portion 38 as shown in FIG. Elastically deform.

Thereafter, using a mounting ring (not shown),
When the distal end optical adapter 2 is fixed to the endoscope distal end portion 10, the adapter main body 20 is fixed in a state where the adapter main body 20 is pressed against the distal end member 11 in the rotation direction by the reaction force due to the elastic deformation of the elastic member 38. As a result, the shift amount α (see FIG. 42) on the image, which is caused by the shift in the rotation direction between the distal end portion 10 and the distal end optical adapter 2, is always constant without being affected by vibration or the like.

(Sixth Embodiment) FIG. 26 shows a sixth embodiment of the present invention.
1 shows a cross-sectional view of an endoscope distal end portion according to the embodiment. In the present embodiment, a groove 31 formed in the distal end member 11 provided in the endoscope distal end portion 10 is formed relatively wide, and an elastic plate formed by bending a flat plate having elasticity is formed in the groove 31. The member 39 is wound in a screw shape at least one round or more, and one end of the elastic member 39 is fixed to the elastic member 11 and the other end is a free end. And the inclined portion 39 a faces the positioning groove 32.

When the distal end optical adapter is mounted on the endoscope distal end portion 10, the positioning pin 21 provided at the rear of the distal end optical adapter is engaged with the positioning groove 32 formed in the distal end member 11. When the positioning pin 21 is inserted, the oblique portion 3 formed at one end of the elastic member 39
When the elastic member 39 is engaged with and further engaged with the positioning member 9a, the elastic member 39 is retracted while being elastically deformed by being pressed by the positioning pin 21.

As a result, the positioning pin 21 is positioned and fixed while being pressed against one side of the positioning groove 32 by a reaction force due to the elastic deformation of the elastic member 39. Therefore, a shift amount α (see FIG. 42) in the rotation direction of the distal end optical adapter with respect to the endoscope distal end portion 10 that appears on the image is:
It is always constant without being affected by vibration.

At this time, since the elastic member 39 is wound in a screw shape, it is sufficiently long and can generate a stronger biasing force.
In contrast, the tip optical adapter can be fixed while being pressed in a certain rotation direction.

(Seventh Embodiment) FIGS. 27 and 28 show a seventh embodiment of the present invention. Here, FIG. 27 is a cross-sectional view of the distal end portion of the endoscope, and FIG. 28 is an enlarged view of a part XXVIII in FIG. In the present embodiment, the distal end member 1 of the endoscope distal end portion 10 is used.
1, a positioning groove 40 having a predetermined depth as a receiving portion is formed obliquely with respect to the axial direction.

One end of the elastic member 41 mounted in the groove 31 formed in the circumferential direction of the tip member 11 has one end.
1 and the other end is a free end, and this simply formed bent portion 41a faces the positioning groove 40 and extends along the inclination direction of the positioning groove 40.

When the distal end optical adapter is attached to the endoscope distal end portion 10, the positioning pin 21 provided at the rear portion of the distal end optical adapter is engaged with the positioning groove 40 formed in the distal end member 11. When the positioning pin 21 is inserted, the positioning pin 21 engages with a bent portion 41a formed at one end of the elastic member 41. When the positioning pin 21 further engages, the elastic member 41 is pressed by the positioning pin 21 and retracts while being elastically deformed. The bent portion 41a is elastically deformed in the insertion direction of the positioning pin 21.

The positioning pin 21 includes the elastic member 41 itself,
As shown in FIG. 28, the positioning pin 21 is pressed against the side surface of the positioning groove 40 by the reaction force due to the elastic deformation of the both bent portions 41a. The amount α (see FIG. 42) is fixed in a state where it is always constant without being affected by vibration or the like.

In this case, since the positioning groove 40 is formed obliquely to the axial direction, when the positioning pin 21 presses the bending portion 41a, the angle θ at which the bending portion 41a is bent is determined by the positioning groove. Is smaller than that formed along the axial direction.

As a result, plastic deformation (so-called settling) of the elastic member 41 is reduced, and the durability of the elastic member 41 can be improved accordingly.

(Eighth Embodiment) FIGS. 29 and 30 show an eighth embodiment of the present invention. Here, FIG.
FIG. 30 is a sectional view corresponding to (a), and FIG. 30 is an explanatory view of an elastic member. The elastic member 42 shown in the present embodiment is formed to be bent in a C-shape, and a U-shaped engaging portion 42a is formed to bend at one end.

The elastic member 42 is mounted in the groove 31 provided around the distal end member 11 provided at the distal end portion of the endoscope, and the end of the hook portion 42a abuts against the bottom surface of the groove 31. Have been.

In the portion of the adapter main body 20 provided on the distal end optical adapter, which fits with the distal end member 11, a hollow portion 31a of a similar shape slightly smaller than the engaging portion 42a of the elastic member 42 is fitted. Is formed.

When the adapter main body 20 is fitted to the distal end member 11, the hollow portion 31 a is formed by the engaging portion 42 of the elastic member 42.
a is slightly smaller than a.
While the endoscope 2a is elastically deformed, it acts as an urging force for pushing up the cut-out portion 31a formed on the adapter body 20, and the urging force causes the distal end optical adapter to be urged in the rotational direction with respect to the endoscope distal end portion. Pressed with.

As a result, not only is the distal end optical adapter always positioned at a fixed rotational position with respect to the endoscope distal end portion, but also the elastic member 42 directly attaches the adapter body 20 having a relatively large shape. Therefore, more stable urging force can be obtained.

(Ninth Embodiment) FIGS. 31 and 32 show a ninth embodiment of the present invention. Here, FIG. 31 is a sectional view of the distal end portion of the endoscope, and FIG. 32 is a sectional view taken along the line XXXII of FIG.
In the present embodiment, at least one cutout surface 11b in the vertical direction and at least one cutout surface 11b in the left and right direction are formed on the distal end surface of the distal end member 11 provided on the distal end portion 10 of the endoscope. The elastic members 43 are fixed to the surface 11b.

The rear end of the adapter body 20 provided on the distal end optical adapter 2 is connected to the distal end member 1 of the endoscope distal end portion 10.
When the mounting member 1 is mounted, the positioning pin 21 fixed to the adapter body 20 engages with the positioning groove 32 formed in the distal end member 11, and the movement in the rotation direction is restricted.

At this time, the elastic member 43 fixed to the notch surface 11b of the distal end member 11 is pressed against the inner wall surface of the adapter body 20 and is elastically deformed. It is urged vertically and horizontally.

As a result, the adapter body 20 is
3 is always pressed in a constant rotational direction by the urging force in the vertical and horizontal directions of the endoscope 3. It is fixed at a constant state without being affected.

(Tenth Embodiment) FIGS. 33 to 37 show a tenth embodiment of the present invention. Here, FIG. 33 is a cross-sectional view of the distal end portion of the endoscope, FIG. 34 is a cross-sectional view of XXXIV of FIG. 33, FIG. 35 is a cross-sectional view of XXXV of FIG. 34, FIG. FIG. 35 is an enlarged view of a main part of FIG. 34 according to another aspect.

In the present embodiment, a positioning groove 32 formed along the axial direction is formed at a position opposite to the axial circumference of the distal end member 11 of the endoscope distal end portion 10 so as to be formed obliquely with respect to the axial direction. And positioning pins 21, 44 engaged in the positioning grooves 32, 40.
Are disposed opposite to each other on the inner periphery of the adapter body 20 of the tip optical adapter.

The positioning pin 21 engaged in the positioning groove 32 is formed of an ordinary rigid body, while the positioning pin 21 engaged in the positioning groove 40 has elasticity.

The rear end of the adapter body 20 provided on the distal end optical adapter is connected to the distal end member 11 of the endoscope distal end portion 10.
, The positioning pins 21 and 44 fixed to the adapter main body 20 are engaged with the positioning grooves 32 and 40 formed in the distal end member 11, respectively.

At this time, the engagement between the positioning groove 32 and the positioning pin 21 restricts the movement of the endoscope distal end portion 10 and the distal end optical adapter in the rotational direction.

At the same time, the positioning pins 4
When the positioning pin 44 is engaged and the positioning pin 44 relatively moves in the positioning groove 40, the pressing force from the wall surface of the positioning groove 40 is reduced because the positioning groove 40 is formed obliquely with respect to the axial direction. Positioning groove 40 while receiving and elastically deforming
Move to the back of.

As a result, the reaction force due to the elastic deformation of the positioning pin 44 acts as an urging force,
Since the adapter main body 20 is always pressed and fixed in a fixed direction, the amount of displacement α (see FIG. 42) in the rotational direction between the distal end member 11 and the adapter main body 20 on the image is affected by vibration or the like. It is always constant without being affected.

As shown in FIG. 36, the positioning pins 4
Numeral 4 has a shaft portion 44a implanted in the adapter body 20 and an engaging portion 44b that engages with the positioning groove 40. When the material is relatively rigid, it is shown in FIG. Thus, a cross-shaped sliding portion 44c is formed on the head of the engaging portion 44b, and when the engaging portion 44b is engaged with the positioning groove 40, the engaging portion 44b is elastically deformed by the sliding portion 44c. You may make it do.

As shown in FIG. 13B, one of the shaft portion 44a and the engaging portion 44b may be made of an elastic body. For example,
By forming the shaft portion 44a of a superelastic alloy and forming the engaging portion 44b of a rigid material (eg, stainless steel), when the engaging portion 44b engages with the positioning groove 40, the shaft portion 44a is elastically deformed. Let it.

In this case, since the engaging portion 44b which engages with the positioning groove 40 has rigidity, the abrasion resistance when the positioning groove 40 and the positioning pin 44 are engaged is improved.
Alternatively, the shaft portion 44a may be formed of a material having rigidity, and the engaging portion 44b may be formed of a material having elasticity such as rubber or resin, and the engaging portion 44b may be formed of a material having elasticity. Then, the reaction force generated by the elastic deformation of the engaging portion 44b itself causes the adapter body 20 to move the endoscope distal end portion 10
Is pressed in a fixed rotational direction against the tip member 11 of the first embodiment.

Alternatively, the positioning pins 44 may have rigidity as a whole. In this case, as shown in FIG. 37, the shaft 44a of the positioning pin 44 is supported via the elastic member 45 in the hole 20e formed in the adapter body 20 where the shaft 44a is implanted. . As a result, at the time of engagement, the adapter body 20 is connected to the distal end member 1 of the endoscope distal end portion 10 by the reaction force generated by the elastic deformation of the elastic member 45.
Press 1

(Eleventh Embodiment) FIGS. 38 to 40 show an eleventh embodiment of the present invention. Here, FIG. 38 is a cross-sectional view showing a state in which the distal end optical adapter is fitted to the distal end portion of the endoscope, FIG. 39 is a cross-sectional view showing a mounted state of the endoscope distal end portion and the distal end optical adapter, and FIG. It is XXXX-XXXX sectional drawing.

In the present embodiment, positioning grooves 32 and 46 having a predetermined depth are formed at positions facing each other on the outer periphery of the distal end member 11 provided on the endoscope distal end portion 10.
Has one positioning groove 32 formed in the axial direction, and the other positioning groove 46 has an inclined surface 46a.

The adapter body 2 of the tip optical adapter 2
0 has a positioning pin 21 that engages with the positioning groove 32 and a protruding piece 47 is formed at a position facing the positioning pin 21. This projecting piece 4
7 is formed integrally with the adapter body 20 by cutting out both sides thereof.

Adapter body 20 of tip optical adapter 2
However, when a predetermined amount or more is fitted to the distal end member 11 provided in the endoscope distal end portion 10, the positioning groove 32 and the positioning pin 21 are engaged.
The movement of the distal end optical adapter 2 and the endoscope distal end portion 10 in the rotational direction is restricted, and at the same time, the projecting piece 47 formed on the adapter body 20 faces the positioning groove 46 formed on the distal end member 11. You.

The distal end member 11 of the adapter body 20
When the fitting amount with respect to increases, the protruding piece 47 comes into contact with the slope 46a of the positioning groove 46, and is pressed by the slope 46a to be elastically deformed.

As a result, the reaction force of the elastic deformation of the projecting piece 47 is used as an urging force, and the adapter body 2
Since 0 is always fixed in a state of being pressed in a fixed rotation direction, the shift amount α displayed on the image (see FIG. 42)
Is always constant without being affected by vibration or the like.

(Twelfth Embodiment) FIG. 41 is a sectional view of a fitting portion between an endoscope distal end portion and a distal end optical adapter according to a twelfth embodiment of the present invention.

In this embodiment, the notch surface 11b is provided at at least one position in the up-down direction and at least one position in the left-right direction of the distal end member 11 provided on the endoscope distal end portion 10.
On the other hand, an elastic member 48 is disposed on the inner periphery of the adapter main body 20 provided on the distal end optical adapter, which fits into the distal end member 11.

At a position corresponding to the cutout surface 11b of the elastic member 48, a curved portion 48a bent in the direction of the cutout surface 11b is formed.

When the adapter body 20 is mounted on the distal end member 11 provided at the distal end portion of the endoscope, the adapter body 20
Is engaged with a positioning groove 32 formed in the distal end member 11, and the movement in the rotation direction is regulated.

Also, the curved portion 48a formed on the elastic member 48 provided on the inner periphery of the adapter body 20 is pressed by the notch surface 11b of the tip member 11 and is elastically deformed. Urges the adapter body 20.

As a result, the adapter body 20 is
1 is always pressed and fixed in a fixed direction, so that the deviation amount α (see FIG. 42) displayed in an image is always constant without being affected by vibration or the like.

[Supplementary Notes] As described above, according to the present invention, the following configuration can be obtained. (1) An elastic member is arranged at the distal end portion of the endoscope, a receiving portion for receiving a biasing force from the elastic member is provided on the distal end optical adapter, and the rotational direction of the distal end optical adapter is positioned by the biasing force of the elastic member. It is characterized by the following.

(2) An elastic member is arranged on the distal end optical adapter, and a receiving portion for receiving the urging force from the elastic member is provided at the end of the endoscope, and the rotating direction of the distal end optical adapter is caused by the urging force of the elastic member. Is positioned.

(3) In (1) or (2), the distal end portion of the endoscope and the distal end optical adapter are fitted with a positioning pin provided on one side and a positioning groove provided on the other side, or have a cross section D. The approximate positional relationship is determined by the fitting in the mold shape, and the positioning is fixed by the urging force in the rotating direction by the elastic member.

(4) In (3), the elastic member is characterized in that its cross section is substantially rectangular, substantially elliptical, or substantially circular.

(5) In (3) or (4), it is possible to switch between full screen display and partial screen display by exchanging the tip optical adapter.

(6) In (5), the endoscope side is constituted by an optical system capable of full-screen display, and the tip optical adapter side is constituted by an optical system capable of partial-screen display.

(7) In (6), the tip optical adapter uses two parallel optical systems.

[0107]

As described above, according to the present invention,
When the distal end optical adapter is mounted on the distal end of the endoscope, the distal end optical adapter is always urged in the rotational direction by the urging force of the elastic member, so that the endoscope and the distal end optical adapter are rotated. The amount of deviation in the direction is always constant without being affected by vibration or the like. Therefore, it is not necessary to consider the amount of change in deviation in calculation of measurement data, and a highly accurate measurement result can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a distal end optical adapter is attached to a distal end portion of an endoscope according to a first embodiment.

FIG. 2 is a cross-sectional view of the distal end portion of the endoscope.

FIG. 3 is an enlarged view showing an engagement state between the endoscope distal end portion and a positioning pin provided on the distal end optical adapter.

FIG. 4 is a sectional view of the tip optical adapter.

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

FIG. 6 is a cross-sectional view corresponding to FIG. 4 according to another embodiment.

7 is a sectional view taken along the line VII-VII of FIG. 6;

FIG. 8 is a sectional view corresponding to FIG. 4 according to another embodiment.

FIG. 9 is a sectional view corresponding to FIG. 4 according to still another embodiment;

FIG. 10 is a cross-sectional view corresponding to FIG.

FIG. 11 is an enlarged view of a main part of FIG. 10;

FIG. 12 is a sectional view corresponding to FIG. 4 according to still another embodiment of the present invention;

FIG. 13 is a left front view of FIG. 12;

14 is a sectional view taken along the line XIV-XIV in FIG.

FIG. 15 is a sectional view corresponding to FIG. 1 according to another embodiment.

FIG. 16 is a cross-sectional view taken along the line XVI-XVI of FIG.

FIG. 17 is a sectional view of an endoscope distal end portion according to a second embodiment.

FIG. 18 is an enlarged view showing the state of engagement between the distal end portion of the endoscope and a positioning pin provided on the distal end optical adapter.

19 is an enlarged view of a portion XIX in FIG. 18;

FIG. 20 is a sectional view of an endoscope tip according to a third embodiment;

FIG. 21 is an enlarged view of a portion XXI of FIG. 20;

FIG. 22 is a sectional view of a distal end portion of an endoscope according to a fourth embodiment.

FIG. 23 is an enlarged view of a portion XXIII of FIG. 22;

FIG. 24 is an enlarged view showing an engagement state between the distal end portion of the endoscope and the distal end optical adapter according to the fifth embodiment.

FIG. 25 is a sectional view taken along the line XXV-XXV of FIG. 24 (b).

FIG. 26 is a sectional view of an endoscope distal end portion according to a sixth embodiment.

FIG. 27 is a sectional view of an endoscope tip according to a seventh embodiment;

FIG. 28 is an enlarged view of a section XXVIII of FIG. 27;

FIG. 29 is a sectional view corresponding to FIG. 2A according to the eighth embodiment;

FIG. 30 is an explanatory view of the same elastic member.

FIG. 31 is a sectional view of an endoscope tip according to a ninth embodiment;

FIG. 32 is a sectional view taken along the line XXXII of FIG. 31;

FIG. 33 is a sectional view of an endoscope distal end portion according to a tenth embodiment.

FIG. 34 is a sectional view taken along the line XXXIV of FIG. 33;

35 is a sectional view taken along the line XXXV in FIG.

FIG. 36 is a perspective view showing an aspect of the positioning pin.

FIG. 37 is an enlarged view of a main part of FIG. 34 according to another embodiment of the present invention;

FIG. 38 is a cross-sectional view showing a state in which the distal end optical adapter is fitted to the distal end portion of the endoscope according to the eleventh embodiment.

FIG. 39 is a cross-sectional view showing a state in which the distal end portion of the endoscope and the distal end optical adapter are mounted.

40 is a sectional view taken along the line XXXX-XXXX in FIG. 39.

FIG. 41 is a sectional view of a fitting portion between a distal end portion of an endoscope and a distal end optical adapter according to a twelfth embodiment;

FIG. 42 is an explanatory diagram showing a shift amount displayed on an image.

[Explanation of symbols]

2 tip optical adapter 10 endoscope tip 11, 12, 35-39, 41, 42, 43-45, 4
8,71 elastic member 30 concave portion (receiving portion) 32,40 positioning groove (receiving portion)

Claims (1)

[Claims] 1. An elastic member is disposed at one of an endoscope distal end portion and a distal end optical adapter attached to the endoscope distal end portion, and a receiving portion receiving an urging force from the elastic member is provided at the other end. An endoscope, wherein a rotation direction of the distal end optical adapter is positioned by an urging force of the elastic member.