JPH01130120A - Rigid endoscope - Google Patents

Abstract

PURPOSE:To eliminate need for moving substantially and to allow an operator to observe in a comfortable position by providing the turning axis of an eye contact part parallel to the axis of an insertion part. CONSTITUTION:The turnable axis of the eye contact part 14 is formed in parallel with the insertion part 12. Therefore, the rotation of the eye contact part 14 is parallel to the axial direction of the insertion part 12. Since the part 14 is protrusively formed in the oblique direction and not perpendicular to the axial direction of the insertion part of the eye contact part 14, the eyes of an operator peeping through an eye contact cover need not move greatly. Thereby the endoscope is more easy-to-handle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rigid endoscope in which the axis of rotation of the eyepiece section is provided in a direction parallel to the axis of the insertion section.

[Prior Art] In recent years, endoscopes have been developed that allow observation of deep parts of the body without the need for incisions by inserting an elongated insertion section into the body, and can perform therapeutic procedures using treatment instruments as necessary. It has become widely used.

The above-mentioned endoscopes include flexible endoscopes with a flexible insertion section and rigid endoscopes with a rigid insertion section.

The above-mentioned rigid endoscope is restricted from being inserted in a direction close to a straight line, but on the other hand, it is more susceptible to sniping than a flexible endoscope. Furthermore, since a relay optical system can be used as an image guide, an observation image with high resolution can be obtained.

By the way, is the hardness mentioned above? ! To ensure that the surgeon always maintains an appropriate posture during mirror observation or treatment,
Conventional examples in which the eyepiece part is movable relative to the insertion part are disclosed in Japanese Utility Model Publication No. 38-27966 and West German Publication DE3,
441,130A17) <Yes.

The above-mentioned Japanese Utility Model Publication No. 38-27966 discloses, as shown in FIG. A reflection 116.7 is provided in each end 5 and optically coupled. Further, these reflecting mirrors 6°7 are housed in a rotating tube 8 extending in a direction perpendicular to the axis of the insertion portion 2, and this rotating tube 8
It is rotatable around the axial direction.

FIG. 7 shows a state in which the rigid endoscope tJt1 of FIG. 6 is inserted into the body wall 9 to observe, for example, the part indicated by 8.
FIG. 8 shows its plan view.

On the other hand, in the above-mentioned West German publication, the insertion part and the eyepiece are connected by a joint having a mirror, and even when the eyepiece is rotated, the mirror is interlocked with a gear provided in the joint, so that the insertion part and the eyepiece are always connected to each other. This allows the optical axis of the part to be connected.

In these two conventional examples, the rotation axis of the eyepiece section is perpendicular to the optical axis of the insertion section.

[Problems to be Solved by the Invention] For example, in the situation shown in FIG. If the operator is in a position where the surgeon is looking up from below and performs mirror viewing, the operator will have to assume a very uncomfortable posture.

In addition, in this conventional example, the eyepiece 4 is rotated as shown in FIG. 6, and from a state where the eyepiece 4 is aligned with the axial direction of the insertion section 2, the eyepiece 4 is rotated back and forth by 90 degrees, making it easy to use. If you try to set it in a position where it can be seen from the posture,
As shown in the figure, since the direction and position of the speculum are significantly different, the operator must change the position of the eyepiece 4a of the eyepiece 4 due to this rotation from the position 10a to 10a.
It had the disadvantage that it was difficult to use because it had to be moved to a position not indicated by 0b.

Incidentally, the conventional example of the West German publication also has similar drawbacks.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a rigid endoscopic 81 mirror that allows the observation direction to be changed and allows the operator to observe in a comfortable posture without forcing the operator to move significantly. purpose.

[Means and effects for solving the problem] In the present invention, in a rigid endoscope in which the eyepiece is rotatable with respect to the insertion portion, the rotation axis of the eyepiece is provided parallel to the axis of the insertion portion. This allows the surgeon to observe in a comfortable position without requiring significant movement.

[Example] Hereinafter, the present invention will be specifically described with reference to the drawings.

1 and 2 show a first embodiment of the present invention, FIG. 1 shows the structure of the first embodiment in a vertical sectional view, and FIG. 2 is a sectional view taken along the line AA' in FIG. 1. shows.

As shown in FIG. 1, a rigid endoscope 11 for treatment according to the first embodiment
is composed of an elongated insertion section 12, a large operation section 13 connected to the rear end of the insertion section 12, and an eyepiece section 14 protruding diagonally from the operation section 13.

The insertion portion 12 is covered with a mantle tube 15, and the mantle tube 15
A lens tube 17 housing an insertion section optical system 16 therein, a light guide fiber 18 for transmitting illumination light, and a channel pipe 20 forming a treatment instrument insertion channel 19 are inserted through the lens tube 17 .

The mantle tube 15 has a rear end that forms the operating section 13 (
(Operation part) It is fitted into the front end of the main body 21 and fixed. The lens tube 17 inserted into the outer tube 15 is fitted into the fixing pipe 22 of the lens tube 17 and fixed. The rear end of this lens tube 17 extends to the inside of the main body 21 . Pipe 22 immediately in front of the front end surface of this lens tube 17
A cover glass 23 is fixed to the. This lens tube 1
The insertion section optical system 15 attached to the lens tube 7 is composed of an objective optical system near the front end of the lens tube 17, and a relay optical system that transmits an optical image produced by the objective optical system to the rear.

The insertion section optical system 16 is housed eccentrically from the central axis of the mantle tube 15 in the direction in which the eyepiece section 14 protrudes.

The light guide fiber 18 inserted adjacent to the lens tube 17 has its rear end side bent within the main body 21.
It extends to a base 24 that is screwed into the screw hole of the main body 21.

A channel pipe 20 eccentrically arranged on the opposite side (lower side) of the lens tube 17 communicates with a channel hole 26 provided in the main body 21, and is fixed to the main body 21 at the front end of the channel hole 26. There is. This channel hole 2
A cock 27 is connected to the rear end of the cock 6, and the channel 19 is opened by rotating the cock core 28 with a lever 29.
The rear end side can be opened and closed.

On the other hand, a cylindrical rotating body 31 is attached to the main body 21 on the opposite side (upper side) from the channel hole 26, with its front end interposed through an O-ring 32, and the rear end of this rotating body 31 is attached to the O-ring 32. 33, and is held down by a rotating body support member 34. This rotating body support member 34 is positioned on the main body 21 at the lower part in FIG. 1 with a set screw 35.

The rotating body 31 has thin notches on the inside of both ends, and O-rings 32 and 33 are housed inside each of these. Due to the frictional resistance, the rotating body 31 can freely rotate around the central axis 01 as a rotation axis.

The front end of an eyepiece main body 35 forming the eyepiece 14 is fixed to the rotating body 31 . Inside the eyepiece main body 35, an eyepiece tube 37 to which an eyepiece optical system 36 is attached.
is fixed to the eyepiece main body 35 via a lens tube fixing pipe 38. This eyepiece tube 37 is connected to the eyepiece main body 3
It is inserted through the central axis of 5. This eyepiece optical system 36 has two prisms 39 and 40 attached to its front end. A right-angle prism 40 is attached to the front end surface (incidence surface) of one prism 39.

The entrance surface of this right angle prism 40 is the insertion part optical system 1.
It is mounted so that it faces the last lens of No. 6 and their optical axes coincide. Further, the optical axis of the insertion section optical system 16 and the □ rotation axis of the rotation body 31 are made to coincide.

Therefore, the optical axis is changed in the perpendicular direction by the prism 40, and the optical axis is transmitted to the eyepiece optical system 36- in the eyepiece tube 37 through the prism 39 facing the prism 40 without deviation of the optical axis. .

An eyepiece attachment pipe 41 is screwed onto the rear end of the eyepiece body 35, and an eyepiece 42 having a conical outer shape is screwed onto the eyepiece attachment pipe 41. An eyepiece cover glass 43 is attached to the open rear end of the eyepiece attachment pipe 41.
You can observe it with the naked eye by bringing your eyes close to it.

By the way, the eyepiece section 14 is designed to be able to rotate around the rotation axis of the rotation body 31, for example, about ±120 degrees as shown in FIG. 2, that is, about 240 degrees as a total rotation angle. It is.

The operation of the first embodiment configured in this way will be explained below.

When performing internal observation using this first embodiment, the operator rotates the eyepiece 14 so that the operator can observe in a comfortable posture.

This rotation can be set to any angle within the range of ±120° from the state not shown in FIG. 1 to the state shown in FIG. 2. This rotation is in a direction parallel to the axial direction of the insertion section 12, and since the eyepiece section 14 protrudes not in a direction perpendicular to the axial direction of the insertion section 12 but in an oblique direction, the eyepiece Changing the position of the operator's eyes when looking through the cover glass 43 does not require significant movement. Therefore, even when the operator is set in a comfortable posture, it is not necessary to move the position of the eyes significantly, making it easy for the operator to use.

In addition, since the angle between the direction of the observing eye and the axial direction of the insertion section 12 is constant (therefore, when the direction of observation with the naked eye is 90 degrees or more with respect to the axial direction of the insertion section 12), In addition, since the observation direction does not turn to the side opposite to the distal end side of the insertion section 12), it is difficult to perform a treatment using a treatment instrument.

Incidentally, the rotational force of the rotating body 31 can be freely and variably set depending on the oblateness and hardness of the O-rings 32 and 33.

Figures 3 and 4 show the hard internal structure of the second embodiment of the present invention.
51 is shown.

In the second embodiment, a rotating body 53 is attached to the eyepiece main body 52 so as to be rotatable in the axial direction (parallel to the direction) of the insertion section 12, as in the first embodiment.

A right-angle prism 54 (corresponding to the right-angle prism 40 in the first embodiment) is attached to the rotating body 53 so as to face the optical system of the insertion section, and further to align with the optical axis changed to the right-angle direction by the right-angle prism 54. The lens 55 is attached. The cylindrical protrusion 53A of the rotary body 53 to which the lens 55 is attached serves as a member for attaching the eyepiece 14, and the protrusion 53A has a connecting portion 52A at the front end of the eyepiece main body 52.
is fitted externally and is rotatably mounted. This connection part 52
Although the axial direction of A is perpendicular to the axis of the insertion portion 12, the rear side of this connecting portion 52A is made to be diagonal to the axis of the insertion portion 12, as in the first embodiment. be. Thus, the optical image is transmitted through the lens 55 to the eyepiece optical system side, which is provided with the prism 39 facing the lens 55.

A connecting portion 52A fitted onto the cylindrical protruding portion 53A of the rotating body 53 has pins 57, 57 for preventing removal from the protruding portion 53.
3A, and the eyepiece 14 side is rotated around the optical axis of the lens 54 (that is, 1Nl of the protrusion 53A) as shown by the symbol C in FIGS. 3 and 4. It is movable.

Further, in the protruding portion 53A, a circumferential groove is formed in a portion that fits into the connecting portion 52A, and a watertight O-ring 59 is housed therein.

The central axis of the entrance surface of the rectangular prism 54 coincides with the output optical axis of the insertion section optical system and the rotational axis of the rotating body 53, and the central axis of the output surface of this prism 54 coincides with the central axis of the protrusion 53A. Accordingly, even with the rotation of the rotating body 53 and the rotation of the eyepiece 14, the optical image by the insertion optical system can be transmitted to the eyepiece optical system without shifting the optical axis.

The other configurations are the same as in the first embodiment.

According to this second embodiment, similarly to the first embodiment, the rotating body 5
3, the observation direction from the eyepiece 14 can be changed, and since the eyepiece main body 52 is also rotatable as shown by C, the observation direction etc. can be changed over a wide range.

FIG. 5 shows a rigid endoscope according to the third embodiment of the present invention! i61 is shown.

Above 1st. In the second embodiment, the eyepiece part 12 has a structure that projects obliquely with respect to the axial direction of the insertion part 12, whereas in the third embodiment, the eyepiece part 12 projects in a direction perpendicular to the rotating body 53. An eyepiece is formed by a first eyepiece 62A and a second eyepiece 62B which is rotatably attached to the eyepiece 62A in a right-angled direction (indicated by an arrow). Note that due to the rotation of the rotating body 53, the first eyepiece 628 moves in the direction of arrow B.
As shown, it is rotatable in the direction perpendicular to the page.

The rest of the structure is the same as that of the first embodiment or the second embodiment.

Note that the present invention is not limited to what has been described above, and for example, in FIG. 5, the first eyepiece 62A and the second eyepiece 62B are
It is also possible to use a connected L-shaped eyepiece (not rotatable).

Further, although each of the above-described embodiments discloses a rigid endoscope through which a treatment instrument can be passed, a structure without a treatment instrument channel may be used. Moreover, it is not limited to a direct view type, but may also be a perspective view type or a side view type.

[Effects of the Invention] As described above, according to the present invention, since the eyepiece part can be rotated in a direction parallel to the axis of the insertion part,
The operator can observe in a comfortable position without having to move significantly.

[Brief explanation of the drawing]

1 and 2 relate to the first embodiment of the present invention, FIG. 1 is a 1af 1 side view showing the structure of the first embodiment, and FIG.
3 is a partially cutaway side view of the second embodiment of the present invention, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is the third embodiment of the present invention. A side view of the embodiment, FIG. 6 is a schematic side view of the conventional example, FIG. 7 is a schematic side view showing the conventional example shown in FIG. 6 in use, and FIG. 8 is a schematic plan view of FIG. 7. It is a diagram. 11... Rigid endoscope for treatment 12... Insertion section 13... Operation section 14...
- Eyepiece section 16... Insertion section optical system 18...
Light guide fiber 21...(operation part) main body 31...rotating body 32.3
3...0 ring 36'...eyepiece optical system Fig. 3 Fig. 4 Fig. 6 A-100

Claims (1)

[Claims] What is claimed is: 1. A rigid endoscope whose eyepiece is rotatable with respect to an insertion section, wherein the rotatable shaft is formed parallel to the insertion section.