WO2011016507A1

WO2011016507A1 - Endoscope

Info

Publication number: WO2011016507A1
Application number: PCT/JP2010/063261
Authority: WO
Inventors: 昌貴鮒田; 洋一芳賀; 忠雄松永; 尚樹森本; 昌徳水島
Original assignee: Funada Masaki; Haga Yoichi; Matsunaga Tadao; Morimoto Naoki; Mizushima Masanori
Priority date: 2009-08-07
Filing date: 2010-08-05
Publication date: 2011-02-10
Also published as: CN102469915A; JP2011036301A

Abstract

An endoscope which has a simple configuration so that the cost thereof does not increase, which can be easily switched between forward observation and backward observation without unnecessarily moving the entire endoscope while the endoscope is being inserted in the human body, and which is very easy to use. An insertion section (11) which is to be inserted into a human body is provided with: a shaft body (12) extending rectilinearly and having an objective lens (12a) provided to the tip side thereof; and an outer tube (20) in which the shaft body (12) is fitted so as to be movable forward and backward in the axial direction. An opening (21) through which the surroundings are observed through the objective lens (12a) is formed on the tip side of the outer tube (20). A reflecting mirror (22) is provided within the opening (21) on the tip side thereof. Moving the shaft body (12) in the forward and backward directions relative to the outer tube (20) enables two types of observation to be at least performed, said two types of observation being forward observation in which the objective lens (12a) is located at a position spaced from the reflecting mirror (22) and backward observation in which the objective lens (12a) is located close to the reflecting mirror (22) and the observation is performed through the reflecting mirror (22).

Description

Endoscope

The present invention relates to an endoscope in which an optical system is built in an elongated insertion portion to be inserted into a body, and an image inside the body is transmitted outside the body via a cable portion connected to the insertion portion, and in particular, an optical fiber bundle, a CCD, The present invention relates to an endoscope that obtains an image with an electronic image sensor such as a C-MOS.

Conventionally, the imaging part of this type of endoscope consists of an objective lens in a fiberscope and a fiber bundle that transmits an image formed by the objective lens, and an image is formed by an objective lens and an objective lens in an electronic scope. In a rigid mirror that is composed of one CCD element that converts an image into an electrical signal, a power supply line that drives the CCD, and a signal line that transmits a video signal and does not bend as a whole, an objective lens and an objective lens are generally used. It consists of a plurality of relay lenses that transmit the image formed in (1).

The insertion part was configured in an elongated shape with strength and thickness that can withstand moderate buckling load in the axial direction. The field of view at the distal end side of such an endoscope is limited to the forward view or the side view by adding a reflector or the like. It was necessary to tilt the rigid endoscope shaft itself. For this reason, there is a problem in that a blind spot is likely to occur in the observation range when there is a limit in the direction of travel or bending during insertion.

As a conventional technique that can solve such problems, for example, as disclosed in Patent Document 1, a cantilever in which a shape memory material is formed in a flat plate shape and a reflective surface are provided, and heating for heating the cantilever There is already known an endoscope that further includes means and can observe not only the front side but also the side of the insertion direction by switching the angle of the reflecting surface by heating the cantilever with a heater.

Further, as disclosed in Patent Document 2, a light irradiation unit is provided behind the convex rotating mirror to irradiate the side of the imaging device, and a side image can be captured, and convex rotation is performed. There is also an imaging device that can illuminate the front of the imaging device by providing a light irradiation unit in front of the body mirror and can capture a front image from a hole provided to include the rotation axis at the apex of the convex rotating mirror Already known.

Japanese Patent Laid-Open No. 11-337843 JP 2002-233494 A

However, the conventional technique described in Patent Document 1 described above has a problem in that a cantilever, a heater, and the like are required as means for switching the angle of the reflecting surface, which increases the number of parts and increases costs. Also, since the field of view that can be observed is limited to the side (90 degrees side from the axis) other than the front, it is possible to observe the rear side opposite to the tip side again without moving during insertion into the body. There was a problem that it was difficult to use.

In addition, in the conventional technique described in Patent Document 2 described above, a wide field of view up to 360 ° around the imaging device can be observed at one time, and the field of view of the peripheral part in the camera traveling direction can be covered. On the other hand, there is a problem that the observation range becomes wide and the aperture cannot be fully drawn, and observation omissions are likely to occur. In addition, the peripheral part of the camera traveling direction can be covered in a wide range, but there is a problem that the rear side opposite to the traveling direction as described above is difficult to use again without moving. .

The present invention has been made paying attention to the problems of the prior art as described above, and does not incur a high cost with a simple configuration, and without moving the entire body during insertion into the body. An object is to provide an easy-to-use endoscope that can be easily switched between observation and backward observation.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] In an endoscope in which an optical system is incorporated in an elongated insertion portion to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion connected to the insertion portion.
The insertion portion includes a shaft main body that is connected to the cable portion, extends linearly, and is provided with an objective lens on a distal end side, and an outer tube in which the shaft main body is fitted so as to be movable back and forth in the axial direction.
A part of the outer periphery on the distal end side of the outer tube is cut out in a range extending in a predetermined range in the axial direction and the circumferential direction, and an opening for observing the periphery from the objective lens of the shaft body is formed,
Provided on the tip side in the opening of the outer tube is a reflecting mirror that accommodates the axial rear in the field of view,
By front-back movement of the shaft main body with respect to the outer tube, the objective lens is observed forward at a position separated from the reflecting mirror, and the objective lens is located behind the reflecting mirror at a position close to the reflecting mirror. An endoscope characterized in that it can be switched at least for observation.

[2] In an endoscope in which an optical system is incorporated in an elongated insertion portion to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion connected to the insertion portion.
The insertion portion includes a shaft main body that is connected to the cable portion, extends linearly, and is provided with an objective lens on a distal end side, and an outer tube in which the shaft main body is fitted so as to be movable back and forth in the axial direction.
The outer tube is formed of a transparent material, and a reflecting mirror is provided on the distal end side of the outer tube to accommodate the rear in the axial direction in the field of view.
By front-back movement of the shaft main body with respect to the outer tube, the objective lens is observed forward at a position separated from the reflecting mirror, and the objective lens is located behind the reflecting mirror at a position close to the reflecting mirror. An endoscope characterized in that it can be switched at least for observation.

[3] In an endoscope in which an optical system is incorporated in an elongated insertion portion to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion connected to the insertion portion.
The insertion portion includes a shaft body that is connected to the cable portion and extends linearly, and an outer tube in which the shaft body is fitted so as to be movable back and forth along the axial direction.
A part of the outer periphery on the distal end side of the outer tube is cut out in a range extending in a predetermined range in the axial direction and in the circumferential direction, and an opening is formed. Provide an objective lens for observation,
Provided on the distal end side of the shaft body with a reflecting mirror that accommodates the front in the axial direction,
By the back-and-forth movement of the shaft main body with respect to the outer tube, the back observation at a position where the reflecting mirror is separated from the objective lens, and the front through the reflecting mirror at a position where the reflecting mirror is close to the objective lens An endoscope characterized in that it can be switched at least for observation.

[4] In an endoscope in which an optical system is incorporated in an elongated insertion portion to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion connected to the insertion portion.
The insertion portion includes a shaft body that is connected to the cable portion and extends linearly, and an outer tube in which the shaft body is fitted so as to be movable back and forth along the axial direction.
The outer tube is formed of a transparent material, and an objective lens is provided on the distal end side of the outer tube to observe the surroundings facing the rear in the axial direction.
Provided on the distal end side of the shaft body with a reflecting mirror that accommodates the front in the axial direction,
By the back-and-forth movement of the shaft main body with respect to the outer tube, the back observation at a position where the reflecting mirror is separated from the objective lens, and the front through the reflecting mirror at a position where the reflecting mirror is close to the objective lens An endoscope characterized in that it can be switched at least for observation.

[5] The endoscope according to [1], [2], [3], or [4], wherein the distal end side of the outer tube is made of a hard material suitable for insertion.

[6] The reflective mirror has a mirror surface in any one of a plane, a concave curved surface, a convex curved surface, or a conical shape with respect to the axial direction [1], [2] , [3], [4] or [5].

[7] [1], [2], [3], [4], wherein the reflecting mirror is provided in a state inclined at a fixed angle with respect to a reference plane perpendicular to the axial direction. The endoscope according to [5] or [6].

[8] [1], [2], [3], [4], [5] characterized in that a front observation light source for irradiating the front in the axial direction is provided on the distal end side of the outer tube. ], [6] or the endoscope according to [7].

[9] [1], [2], [3], [4], [5], wherein a rear observation light source for irradiating the periphery of the position is provided in the middle of the outer tube , [6], [7] or [8].

[10] An antireflection member for preventing direct light irradiation from the rear observation light source to the reflecting mirror is provided at a front position of the rear observation light source of the outer tube [9]. The endoscope according to 1.

The present invention operates as follows.
In the endoscope described in [1], the elongated insertion portion to be inserted into the body includes a shaft main body provided with an objective lens on the distal end side, and an outer tube in which the shaft main body is fitted so as to be movable in the axial direction. The inside of the body can be observed through an opening formed by cutting out the outer periphery of the outer tube from the objective lens.

Here, by simply moving the shaft body back and forth with respect to the outer tube, the field of view observed from the objective lens can be easily switched in the front-rear direction without moving the outer tube.

That is, when the shaft body is moved rearward with respect to the outer tube and the objective lens is separated from the reflecting mirror on the tip side in the opening, the front observation can be performed as it is. On the other hand, when the shaft main body is moved toward the front with respect to the outer tube and the objective lens is brought close to the reflecting mirror, the rear observation can be performed through the reflecting mirror. Of course, it goes without saying that the observation between the front observation and the rear observation can be appropriately performed without any steps.

For example, as described in [6] above, the reflecting mirror may be a mirror surface having any shape of a plane, a concave curved surface, a convex curved surface, or a conical shape with respect to the rear in the axial direction. Here, in the case of a concave curved surface, it becomes possible to observe a local area with a high magnification. Further, in the case of a convex curved surface or a conical shape, the rear side can be observed in a wider range including its periphery.

Further, as described in [2] above, the outer tube may be formed of a transparent material, and a reflecting mirror may be provided on the distal end side of the outer tube so that the rear side in the axial direction is accommodated in the visual field. In such a case, it is possible to view through the outer periphery of the outer tube without providing an opening, and the field of view can be expanded without the view being blocked by a part of the outer periphery.

As described above, when the outer tube is formed of a transparent material, the mechanical strength becomes weak and bending or damage occurs during insertion, as described in the above [5], the distal end side of the outer tube is made of metal or the like. It is better to make it with a hard material with excellent strength.

Moreover, in the endoscope described in [1], an objective lens is provided in the shaft body and a reflecting mirror is provided in the outer tube. However, as in the endoscope described in [3] as an opposite aspect, You may comprise so that a reflecting mirror may be provided in a shaft main body and an objective lens may be provided in an outer tube.

Similarly, in the endoscope described in the above [2], an objective lens is provided in the shaft body and a reflecting mirror is provided in the outer tube. However, as an opposite aspect, as in the endoscope described in the above [4]. A reflection mirror may be provided on the shaft body, and an objective lens may be provided on the outer tube.

In addition, as described in [7] above, if the reflecting mirror is provided at a certain angle with respect to a reference plane perpendicular to the axial direction, not only the rear side but also the lateral side can be accommodated in the field of view. It becomes possible.

Further, as described in [8], a front observation light source for irradiating the front in the axial direction may be provided on the distal end side of the outer tube. This makes it possible to obtain a bright and clear image during normal forward observation.

Further, as described in [9], a rear observation light source for irradiating the periphery of the position may be provided in the middle of the outer tube. As a result, it is possible to obtain a bright and clear image even during rearward observation.

Further, as described in [10] above, an antireflection member is provided at the front position of the rear observation light source of the outer tube to prevent direct light irradiation from the rear observation light source to the reflecting mirror. And good. Thereby, it becomes possible to obtain a clear image by preventing the reflection of light on the reflecting mirror.

According to the endoscope according to the present invention, since the relative positional relationship between the objective lens and the reflecting mirror changes due to the back-and-forth movement of the shaft main body with respect to the outer tube, the front observation and the rear observation are switched. Without incurring high costs, it is possible to perform at least two of the front observation and the rear observation without moving the entire body during insertion into the body, and the usability in the treatment can be improved.

It is a side view which expands and shows the insertion part inserted in a body among the endoscopes which concern on embodiment of this invention. It is a side view shown in the state where a shaft main part of an endoscope concerning an embodiment of the invention was removed from an outer tube. It is a side view showing the whole device except an outer tube among endoscopes concerning an embodiment of the invention. It is explanatory drawing which shows the state which observes ahead with the endoscope which concerns on embodiment of this invention. It is explanatory drawing which shows the state observed back with the endoscope which concerns on embodiment of this invention. It is explanatory drawing which shows typically the catheter replacement | exchange operation | work in endoscopic gastrostoma construction using the endoscope which concerns on embodiment of this invention. FIG. 7 is an explanatory view schematically showing a catheter replacement operation in an endoscopic gastrostomy construction that is a continuation of FIG. 6.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment that represents the present invention will be described based on the drawings.
1 to 6 show an embodiment of the present invention.
1 to 3 schematically show a schematic configuration of an endoscope 10 according to the present embodiment. FIG. 1 is an enlarged view of an elongated insertion portion 11 to be inserted into the body of the endoscope 10. FIG. 2 is a side view showing the shaft main body 12 of the insertion portion 11 removed from the outer tube 20, and FIG. 3 is a side view showing the entire apparatus connected to the shaft main body 12.

The endoscope 10 is a device that incorporates an optical system in an elongated insertion portion 11 that is inserted into the body, and transmits an image inside the body to the outside via a cable portion 13 connected to the insertion portion 11. The insertion portion 11 is connected to a cable portion 13 made of a bundle of optical fibers, extends linearly, and has a shaft main body 12 provided with an objective lens 12a on the distal end side. And an outer tube 20 to be provided.

The cable portion 13 is flexible so that it can be flexibly bent. However, the shaft body 12 connected to the distal end side of the cable portion 13 has rigidity that extends linearly and does not easily bend. The shaft body 12 may be configured by covering the tip side of the cable portion 13 with a thin tube made of stainless steel or synthetic resin over a predetermined length, for example. An objective lens 12 a made of a light transmissive material that transmits visible light is provided on the distal end side of the shaft body 12.

An observation lens 14 that can be seen in an enlarged state of an image transmitted by the internal optical fiber is connected to the base end of the cable portion 13. Further, instead of the observation lens 14, a monitor screen that displays an image may be connected. In addition, what is necessary is just to set the full length of the cable part 13 arbitrarily, but it is good to set the full length of the shaft main body 12 to 150 mm and an outer diameter to about 2.1 mm, for example.

The outer tube 20 shown in FIG. 1 is configured by covering a thin metal tube 20a made of stainless steel or the like with a thin cover tube 20b made of a transparent resin. The outer tube 20 is formed into a thin tube using a transparent material such as a transparent resin. Also good. In any configuration, the shaft body 12 is a member that is fitted inside the shaft body 12 so as to be movable back and forth along the axial direction. As a specific material of the cover tube 20b, a transparent resin used as a medical device such as silicone rubber or soft polyvinyl chloride is suitable.

On the distal end side of the outer tube 20, an opening 21 for observing the periphery from the objective lens 12 a of the shaft body 12 is formed by cutting out a part of the outer periphery in a range extending in a predetermined range in the axial direction and the circumferential direction. ing. A reflecting mirror 22 is provided on the distal end side in the opening 21 so that the rear side in the axial direction can be accommodated. When the outer tube 20 is formed of a transparent material, the reflecting mirror 22 may be provided on the distal end side of the outer tube 20 without providing the opening 21 in particular.

The opening 21 is cut out in a wide range leaving a part of the outer periphery only in a straight line parallel to the axial direction, and a sufficiently wide field of view can be secured. The reflecting mirror 22 is disposed on the distal end side in the opening 21 with its central axis coinciding with the axial direction. Specifically, the reflecting mirror 22 is flat with respect to the rear in the axial direction. The mirror surface has a concave curved surface, a convex curved surface, or a conical shape. The mirror surface itself may be formed by vapor deposition or plating of a metal having a mirror effect, or the metal as a mirror material may be formed as it is in a predetermined surface shape.

As shown in FIGS. 4 and 5, the endoscope 10 is configured to perform forward observation at a rear position (see FIG. 4) in which the objective lens 12 a is separated from the reflecting mirror 22 by the back-and-forth movement of the shaft body 12 with respect to the outer tube 20. The objective lens 12a is configured to be switchable at least to a rear observation through the reflecting mirror 22 at a front position (see FIG. 5) close to the reflecting mirror 22. Here, a latch joint portion 15 is provided on the proximal end side of the shaft body 12, while a latch portion 23 is provided on the proximal end side of the outer tube 20.

The latch joint portion 15 and the latch portion 23 are combined with each other so that the shaft body 12 can be locked to the rear position (see FIG. 4) and the front position (see FIG. 5) with respect to the outer tube 20, respectively. is there. Specifically, for example, as in a well-known technique in a general ball-point pen knock mechanism, the latch joint portion 15 may be alternately protruded by pushing the latch joint portion 15 toward the outer tube 20 side with reference to the rear position (see FIG. 4). Any configuration that can perform an immersive operation is acceptable.

Further, a front observation light source 25 for irradiating the front in the axial direction is provided at the forefront of the outer tube 20. Specifically, the front observation light source 25 is configured by radially molding a plurality of chip LEDs in a forward direction inside a transparent resin molded into a bullet shape. The power supply to the front observation light source 25 may be connected by attaching a small battery that fits on the distal end side of the outer tube 20 or by extending the electric wire by mixing it with an optical fiber.

Furthermore, a rear observation light source 26 for irradiating the periphery of the position is provided at a position closer to the base end side than the opening 21 of the outer tube 20. Here, if the total length of the shaft body 12 is, for example, 150 mm, the distance from the front end side of the front observation light source 25 to the base end of the rear observation light source 26 is preferably set to about 30 to 50 mm.

The rear observation light source 26 is specifically configured by arranging a plurality of chip LEDs side by side in the entire circumferential direction on the outer periphery of the outer tube 20. The power supply to the rear observation light source 26 may be connected with a small battery that fits inside the outer tube 20 or may be connected by extending an electric wire mixed with an optical fiber.

At the front position of the rear observation light source 26 in the outer tube 20, an antireflection member 27 for preventing direct light irradiation from the rear observation light source 26 to the reflecting mirror 22 is provided. The antireflection member 27 may be anything as long as it prevents light from the rear observation light source 26 from being reflected directly on the reflecting mirror 22, but as a specific material, for example, a part of the metal thin tube 20a is projected. As another configuration example, when the entire outer tube 20 is formed of only a transparent resin, the resin material may be mixed with a black pigment.

Next, the operation of the endoscope 10 according to the present embodiment will be described.
As shown in FIG. 4, an elongated insertion portion 11 to be inserted into the body of the endoscope 10 is fitted into a shaft main body 12 provided with an objective lens 12 a on the distal end side, and the shaft main body 12 is movable in the axial direction. The outer tube 20 is provided, and the inside of the body can be observed through the opening 21 in which the outer periphery of the outer tube 20 is cut out from the objective lens 12a. An image captured by the objective lens 12 a through the opening 21 is transmitted outside the body through the cable unit 13 and can be observed through the observation lens 14 (see FIG. 3) at the base end of the cable unit 13.

During such observation, the field of view observed from the objective lens 12a can be easily switched in the front-rear direction without moving the outer tube 20 simply by moving the shaft body 12 back and forth with respect to the outer tube 20. In FIG. 4, when the objective lens 12 a is at a rear position separated from the reflecting mirror 22, it is possible to observe the front irradiated with light by the front observation light source 25.

On the other hand, the locked state by the latch joint portion 15 and the latch portion 23 is released, and the shaft body 12 is moved forward relative to the outer tube 20 as shown in FIG. When approaching the reflecting mirror 22 on the distal end side, the rear side irradiated with light by the rear observation light source 26 can be observed through the reflecting mirror 22. Here, the light traveling forward from the rear observation light source 26 is blocked by the antireflection member 27, so that the reflection of light on the reflecting mirror 22 can be prevented and a clear image can be obtained. Of course, it goes without saying that the observation between the front observation and the rear observation can be appropriately performed without any steps.

Further, when the outer tube 20 is formed of a transparent material, and the reflecting mirror 22 is provided on the distal end side of the outer tube 20 so that the rear side in the axial direction can be accommodated in the field of view, the opening 21 is not provided. Visual recognition through the outer periphery of the outer tube 20 is possible, and the field of view can be expanded without being blocked by a part of the outer peripheral portion.

As the reflecting mirror 22, a mirror surface having any one of a flat surface, a concave curved surface, a convex curved surface, or a conical shape may be employed with respect to the rear in the axial direction. Here, in the case of a concave curved surface, it becomes possible to observe a local area with a high magnification. Further, in the case of a convex curved surface or a conical shape, the rear side can be observed in a wider range including its periphery. Further, a prism having the same function may be used instead of the reflecting mirror 22.

Further, the reflecting mirror 22 may be provided in a state of being inclined at a certain angle with respect to a reference plane perpendicular to the axial direction. As a result, not only the rear but also the side can be accommodated in the field of view. For example, if the inclination is set at a maximum of 45 degrees, a straight image can be seen. Note that the angle of the reflecting mirror 22 does not necessarily have to be constant, and may be freely variable by an operator from the outside. Here, as the variable means, it is conceivable to use, for example, pushing and pulling with a wire, inflation of a fine balloon, or the like.

If the endoscope 10 is used in this way, it is possible to easily perform a procedure of inserting a catheter percutaneously into the abdominal viscera. 6 and 7 schematically show a catheter exchange operation in an endoscopic gastrostomy performed for the purpose of supplementing nutrients, discharging body fluids, and the like. The outline will be described. First, as shown in FIG. 6A, the endoscope 10 is inserted into a new replacement catheter B. Next, as shown in FIG. 6B, the insertion portion 11 of the endoscope 10 is inserted into the stomach through the main lumen of the old catheter A.

Subsequently, as shown in FIG. 6C, the old catheter A is pulled out along the insertion portion 11 or the cable portion 13 along the endoscope 10. At this time, as shown in FIG. 7 (d), the old catheter A is divided and removed, and as shown in FIG. 7 (e), the replacement catheter B is directly attached to the stomach wall along the cable portion 13 or the insertion portion 11. Insert through. Finally, as shown in FIG. 7F, the endoscope 10 is removed. In this way, the catheter replacement operation can be easily performed.

The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and the present invention can be changed or added without departing from the scope of the present invention. Included in the invention. For example, in the above-described embodiment, the example in which the earscope is improved as the endoscope 10 has been described. However, the present invention is not limited to such a medical endoscope, and includes piping, various machines, and the like. It may be applied to the internal inspection.

Further, when the outer tube 20 is formed of a transparent material, the mechanical strength is weakened, and when the outer tube 20 is bent or damaged during insertion, the tip side of the outer tube 20 is made of a hard material having excellent strength such as metal. good. Further, not only a fiberscope that projects an image with a bundle of optical fibers, but also an electronic scope in which a small electronic imaging device (CCD) or an electronic imaging device (CCD) such as a CMOS is arranged on the distal end side of the scope.

Furthermore, as another embodiment, in the case where the above-described small electronic image pickup device (CCD) is used, the electronic image pickup device (CCD) and the objective lens 12a in the opening 21 cut out in the outer tube 20 are used. A reflecting mirror 22 that accommodates the front in the axial direction in the field of view may be provided on the distal end side of the shaft body 12 while being provided on the distal end side so as to face the rear in the axial direction.

That is, in the endoscope 10 described above, the objective lens 12a is provided on the shaft body 12, and the reflecting mirror 22 is provided on the outer tube 20, but as a reverse aspect, the reflecting mirror 22 is provided on the shaft body 12 and the outer tube is provided. 20, the objective lens 12a and an electronic image pickup device (not shown) are provided. Here, when the outer tube 20 is formed of a transparent material, it is not necessary to provide the opening 21 in the outer tube 20 as described above, and the objective lens 12a and the electron facing the rear side in the axial direction as it is on the distal end side of the outer tube 20. An imaging element (CCD) may be provided.

According to the configuration of such another embodiment, the back observation at the position where the reflecting mirror 22 is separated from the objective lens 12a by the longitudinal movement of the shaft body 12 with respect to the outer tube 20, and the reflecting mirror 22 is the objective lens 12a. It is possible to perform at least switching between forward observation through the reflecting mirror 22 at a position close to. Of course, observation at an intermediate position between the backward observation and the forward observation can be appropriately performed.

The endoscope according to the present invention is particularly excellent for use in endoscopic gastrostomy.

DESCRIPTION OF SYMBOLS 10 ... Endoscope 11 ... Insertion part 12 ... Shaft body 12a ... Objective lens 13 ... Cable part 14 ... Observation lens 15 ... Latch joint part 20 ... Outer tube 20a ... Metal thin tube 20b ... Cover tube 21 ... Opening part 22 ... Reflector 23 ... Latch part 25 ... Light source for front observation 26 ... Light source for rear observation 27 ... Antireflection member

Claims

In an endoscope (10) in which an optical system is incorporated in an elongated insertion portion (11) to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion (13) connected to the insertion portion (11).
The insertion portion (11) is connected to the cable portion (13), extends linearly, and has a shaft main body (12) provided with an objective lens (12a) on the distal end side, and the shaft main body (12) extends along the axial direction. And an outer tube (20) that is fitted so as to be movable back and forth,
A part of the outer periphery on the distal end side of the outer tube (20) is cut out in a range extending in a predetermined range in the axial direction and the circumferential direction, and the periphery is observed from the objective lens (12a) of the shaft body (12). Forming an opening (21);
Provided on the distal end side in the opening (21) of the outer tube (20) is a reflecting mirror (22) that accommodates the axial rear in the field of view,
When the shaft main body (12) is moved back and forth with respect to the outer tube (20), the objective lens (12a) is forwardly observed at a position separated from the reflecting mirror (22), and the objective lens (12a) is reflected. An endoscope (10) characterized in that it can be switched at least to a rear observation through the reflecting mirror (22) at a position close to the mirror (22).
In an endoscope (10) in which an optical system is incorporated in an elongated insertion portion (11) to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion (13) connected to the insertion portion (11).
The insertion portion (11) is connected to the cable portion (13), extends linearly, and has a shaft main body (12) provided with an objective lens (12a) on the distal end side, and the shaft main body (12) extends along the axial direction. And an outer tube (20) that is fitted so as to be movable back and forth,
The outer tube (20) is formed of a transparent material, and a reflecting mirror (22) that accommodates the rear in the axial direction in the field of view is provided on the distal end side of the outer tube (20).
When the shaft main body (12) is moved back and forth with respect to the outer tube (20), the objective lens (12a) is forwardly observed at a position separated from the reflecting mirror (22), and the objective lens (12a) is reflected. An endoscope (10) characterized in that it can be switched at least to a rear observation through the reflecting mirror (22) at a position close to the mirror (22).
In an endoscope (10) in which an optical system is incorporated in an elongated insertion portion (11) to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion (13) connected to the insertion portion (11).
The insertion portion (11) includes a shaft main body (12) extending in a straight line and connected to the cable portion (13), and an outer tube (20) in which the shaft main body (12) is fitted so as to be movable back and forth in the axial direction. )
A part of the outer periphery on the distal end side of the outer tube (20) is cut out in a range extending in a predetermined range in the axial direction and the circumferential direction to form an opening (21), and the distal end side in the opening (21) In addition, an objective lens (12a) for observing the surroundings facing the rear in the axial direction is provided,
A reflecting mirror (22) is provided on the distal end side of the shaft body (12) to accommodate the front in the axial direction in the field of view,
Backward observation at a position where the reflecting mirror (22) is separated from the objective lens (12a) by the back-and-forth movement of the shaft body (12) relative to the outer tube (20), and the reflecting mirror (22) is the objective. An endoscope (10) characterized in that at least switching between forward observation through the reflecting mirror (22) at a position close to the lens (12a) is possible.
In an endoscope (10) in which an optical system is incorporated in an elongated insertion portion (11) to be inserted into the body, and an image inside the body is transmitted outside the body via a cable portion (13) connected to the insertion portion (11).
The insertion portion (11) includes a shaft main body (12) extending in a straight line and connected to the cable portion (13), and an outer tube (20) in which the shaft main body (12) is fitted so as to be movable back and forth in the axial direction. )
The outer tube (20) is formed of a transparent material, and an objective lens (12a) for observing the periphery is provided on the distal end side of the outer tube (20).
A reflecting mirror (22) is provided on the distal end side of the shaft body (12) to accommodate the front in the axial direction in the field of view,
Backward observation at a position where the reflecting mirror (22) is separated from the objective lens (12a) by the back-and-forth movement of the shaft body (12) relative to the outer tube (20), and the reflecting mirror (22) is the objective. An endoscope (10) characterized in that at least switching between forward observation through the reflecting mirror (22) at a position close to the lens (12a) is possible.
The endoscope (10) according to claim 1, 2, 3, or 4, wherein a distal end side of the outer tube (20) is made of a hard material suitable for insertion.
The said reflecting mirror (22) has a mirror surface in any shape of a plane, a concave curved surface, a convex curved surface, or a cone shape with respect to an axial direction. The endoscope (10) according to 4 or 5.
The said reflecting mirror (22) is provided in the state inclined in a fixed angle with respect to the reference plane perpendicular | vertical to an axial direction, The 1, 2, 3, 4, 5 or 6 characterized by the above-mentioned. Endoscope (10).
The front observation light source (25) for irradiating the front in the axial direction is provided on the distal end side of the outer tube (20). The endoscope (10) described in 1.
The back observation light source (26) for irradiating the circumference | surroundings of the said position was provided in the middle of the said outer tube (20), The 1, 2, 3, 4, 5, 6, 7 or characterized by the above-mentioned 8. The endoscope (10) according to 8.
An antireflection member (27) for preventing direct light irradiation from the rear observation light source (26) to the reflecting mirror (22) at a front position of the rear observation light source (26) of the outer tube (20). The endoscope (10) according to claim 9, wherein the endoscope (10) is provided.