JP2004065316A - Endoscope instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endoscope which performs focusing by detecting a focus position through the use of a simple and inexpensive constitution, and which enables an operator to constantly perform manipulations while observing a bright and clear image focused on an electrode and the vicinity of the electrode. <P>SOLUTION: A resectoscope 1, which is attached to a cameral head 4, comprises a sheath 13 into which the electrode 14 is inserted and which can be inserted into a subject, and an insertion part 19 which is inserted into the sheath 13 and in which an observational optical system is to be housed. The electrode 14 is mounted by fixing an end to a slider 15, and the amount of the protrusion of the electrode 14 is varied depending to the movement of the slider 15. The amount of the protrusion is detected by a Hall element 28 which is arranged in the slider 15. The focusing of the imaging optical system of the camera head 4 is performed based on data on the detected protrusion, and control is performed so that an observation image focused on the vicinity of the electrode 14 can be constantly obtained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an imaging apparatus for an endoscope or an endoscope apparatus having an electronic endoscope unit having an optical system capable of moving forward and backward.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a so-called resectoscope as one of endoscope devices, and this resectscope is a high-frequency endoscope device configured to resect a lesion such as a prostate, an inner wall of a uterus, or an inner wall of a bladder. For example, those disclosed in Japanese Patent Application Laid-Open Nos. 60-149616 and 3-295550 are known.
[0003]
On the other hand, there has been known an electronic endoscope apparatus disclosed in Japanese Patent Application Laid-Open Nos. 10-179506 and 10-118007, in which an optical system is driven by a built-in actuator to perform focus adjustment. Also, there is an endoscope imaging apparatus disclosed in Japanese Patent Application Laid-Open No. 2001-46333, which can be connected to an eyepiece of an optical endoscope and can capture an endoscope image. Also, the focus adjustment of the optical system is possible.
[0004]
An endoscope autofocus mechanism disclosed in Japanese Patent Application Laid-Open No. 8-136732 measures a distance from the end of the endoscope to a part to be observed, and moves an objective optical system according to the measured value. Objective auto-focusing mechanism for an endoscope that performs automatic focusing by using an objective optical system that has a plurality of focusing zones with different focal lengths and moves an objective optical system so that the focusing zones overlap each other. It has system moving means.
[0005]
Further, in the endoscope apparatus disclosed in Japanese Patent Application Laid-Open No. H10-118008, the focus lens at the end of the endoscope is driven by focus under the control of the autofocus control apparatus. Focusing is performed by obtaining focus information of a subject based on image information captured by a video processor.
[0006]
Further, the endoscope device disclosed in Japanese Patent Application Laid-Open No. H10-165358 has an autofocus endoscope for automatically adjusting a focal length with a subject, and a variable focal length mechanism of the autofocus endoscope. The movable unit is controlled and driven by a focus control device, and performs focusing.
[0007]
Further, the in-vivo observation device disclosed in Japanese Patent Application Laid-Open No. H10-309258 discloses an in-body-cavity observation device that controls the drive amount of the magnification varying means and the bending means in accordance with the interest position detected by the interest position detection means. This is to obtain an appropriate observation image of the position portion.
[0008]
Further, the surgical / diagnostic imaging apparatus disclosed in Japanese Patent Application Laid-Open No. H11-501850 has a rotatable image sensor at a distal end, and in use, the image sensor and the support are disposable aseptic sheaths. And the distal end of the sheath is inserted into the patient through the incision.
[0009]
Further, the endoscope apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 63-78915 detects the opening angle of the diaphragm means and sets the focal length of the objective lens according to the numerical value of the detected opening angle.
[0010]
[Problems to be solved by the invention]
In the resectoscope disclosed in Japanese Patent Application Laid-Open No. 60-149616 and Japanese Patent Application Laid-Open No. 3-295550 described above, an electrode to which a high-frequency current is applied slides back and forth, so that the patient's prostate or the inner wall of the bladder. Although it is configured to perform such excision, in recent years, by combining an electronic endoscope or an endoscope imaging device that is becoming popular and the above-mentioned resectoscope, the resected state of the lesion by the electrodes is reduced. A device capable of observing an endoscope image on a monitor screen has been proposed. In an apparatus in which the electronic endoscope or the endoscope imaging apparatus is combined with the resectoscope, an inner end obtained by the electronic endoscope or the endoscope imaging apparatus over the entire range in which the electrodes slide. In order to achieve a deep depth of field such that the endoscope image is in focus, it is necessary to widen the angle of the endoscope optical system or to use an aperture. However, when these are employed, the following adverse effects occur.
[0011]
That is, if the angle of the endoscope optical system is widened so as to obtain a sufficient depth of field, the field of view of the endoscope image is considerably widened. For this reason, an extra portion, for example, the inner wall of the perfusion sheath, other than the resectable range by the resectscope, comes into the field of view. Then, the size of the electrode itself is reduced to the extent that the visual field range is widened, making it difficult to visually recognize the image. Also, the surgeon needs to make extra effort to confirm the resected part.
[0012]
On the other hand, if an optical stop that can obtain a sufficient depth of field is provided in the endoscope optical system, the brightness of the endoscope image obtained by the endoscope optical system naturally becomes dark. Generally, a resectoscope is manufactured with a small outer diameter for insertion into a patient's urethra. Therefore, it is difficult to say that the amount of light is not sufficient even when the endoscope optical system is not provided with a stop, and the installation of the stop further reduces the brightness of the endoscope image and makes it darker. Therefore, the operator needs to make extra effort for visual recognition in the body cavity.
[0013]
For this reason, in the resect scope, it is necessary to allow the image to be dark or to cause the focus to shift so as not to seriously affect the procedure. Alternatively, the sliding range of the electrode must be narrowed to a range that does not affect the focus, so that the amount of tissue that can be cut at one time must be reduced. For each of the above situations, the surgeon has required extra effort.
[0014]
In order to avoid the above-mentioned adverse effects, it is appropriate to make the electronic endoscope or the endoscope imaging apparatus autofocus. However, in order to configure an auto-focus mechanism based on an output signal from an image sensor as disclosed in JP-A-10-179506 and JP-A-10-118007, an autofocus mechanism for detecting a focus position is required. The focus unit had to be provided separately. As a method for detecting the focus position, various methods such as a method using an image contrast method and a method using a distance measurement have been conventionally disclosed. However, whichever method is adopted, an autofocus unit is added. This has inevitably made the system complicated and expensive.
[0015]
The present invention has been made in view of the above-described problems, and performs focusing by detecting a focus position with a simpler and less expensive configuration than in the past, thereby using an electronic endoscope or an endoscope. The focus position of the observation optical system by the mirror imaging device can be adjusted, the depth of field is improved, and the surgeon always proceeds with the procedure while observing a bright and clear image focused on the electrode and its vicinity. It is an object of the present invention to provide an endoscope apparatus which makes it possible.
[0016]
[Means for Solving the Problems]
An endoscope apparatus according to the present invention includes a long insertion portion that can be inserted into a subject, a treatment unit protruding from a distal end portion of the insertion portion and capable of treating the subject, and the treatment provided in the insertion portion. An insertion path through which the means can be inserted, an observation optical system capable of observing an optical image, a focal position of the observation optical system, and a field changing means capable of changing a depth of field; Movement detecting means for detecting movement with respect to the insertion path, and the object position changing the focal position of the observation optical system and the depth of field according to the movement of the treatment means detected by the movement detecting means. And a field control unit capable of controlling the field changing unit. In the endoscope apparatus, the object field control unit is configured to control the field change unit in accordance with a movement amount of the treatment unit detected by the movement detection unit. Focus position of the observation optical system and Since the depth is changed, the observation optical system is focused on the treatment unit, and the depth of field is changed, the surgeon can always observe the focused image of the subject. .
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIGS. 1 to 6 relate to a first embodiment of the present invention, and FIG. 1 is a schematic diagram showing an overall configuration of an endoscope apparatus according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a detailed structure of a resectoscope constituting the endoscope apparatus of FIG. FIG. 3 is a cross-sectional view showing a magnetization state of a guide shaft portion of the resectoscope of FIG. FIG. 4 is a cross-sectional view illustrating a structure of a camera head included in the endoscope apparatus of FIG. FIG. 5 is a block diagram of a high-frequency power supply circuit that constitutes the endoscope apparatus of FIG. 1, and shows a configuration (monopolar) in which a counter electrode plate is required as an example. FIG. 6 is a block diagram of a processor device constituting the endoscope device of FIG.
[0018]
The endoscope device 81 of the first embodiment is detachably mounted on the resectoscope 1, the A-code 3 and the light guide cable 2 connected to the resect scope 1, and the resect scope 1. A camera head 4 which is an imaging device for an endoscope, a high-frequency power supply device 6 connected to the A code 3, a light source device 5 connected to the light guide cable 2, and a camera cable 4 connected to the camera head 4. And an observation monitor 10 connected to the processor device 8 via an electric signal cable 9, and an electric signal cable 11 connecting the high-frequency power supply device 6 and the processor device 8.
[0019]
As shown in FIG. 2, the resectoscope 1 includes an optical viewing tube 12, a hollow sheath 13 attached to an operation unit main body 17, an electrode 14 which is a treatment unit capable of treating a subject, and a moving operation unit. , The operation unit main body 17 having the water supply port 77, and the stopper 16.
[0020]
A hollow guide shaft 18 is provided between the operation unit main body 17 and the stopper 16 and is integrated. A long sheath 13 which is an insertion portion that can be inserted into a subject is connected to and fixed to the operation portion main body 17.
[0021]
The optical viewing tube 12 includes an insertion section 19 in which an observation optical system is housed, and an eyepiece section 20 constituting an observation optical system capable of observing an optical system image.
[0022]
The insertion section 19 is provided so as to pass through the inside of the guide shaft 18 and the inside of the sheath 13, and can be inserted into the subject together with the sheath 13. The eyepiece 20 is connected and fixed to the stopper 16, and the camera head 4 is detachably attached to the eyepiece 20.
[0023]
The sheath 13 is a long hollow insertion portion that can be inserted into a subject, and forms an insertion passage through which a current-carrying portion of the electrode 14 passes.
[0024]
A slider 15 for moving the electrode 14 is inserted through the guide shaft 18. The slider 15 is supported slidably back and forth along a guide shaft 18 between a stopper 16 and an operation portion main body 17, and the electrode 14 passing through the sheath 13 is moved by the reciprocal sliding. .
[0025]
The slider 15 is constantly urged by a spring joint 21 in a direction in which the slider 15 comes into contact with the operation section main body 17. The slider 15 is integrally provided with a finger hook 22 which is a handle of the operation unit, and the stopper 16 is provided with a finger hook 23. Can be slid in the direction in which it comes into contact with the stopper 16 against the urging force of the spring joint 21.
[0026]
The electrode 14 has a current-carrying part 25 at its end connected to and attached to the slider 15. The electrode 14 is inserted through the insertion passage in the operation part body 17 and the sheath 13, and protrudes from the distal end of the sheath 13. Be placed. Therefore, the amount of protrusion of the electrode 14 changes as the slider 15 moves.
[0027]
The slider 15 is provided with a connector 24, and the electrode 14 is electrically connected to a high-frequency output line 34 of the connector 24 via a conducting part 25 in the slider 15, which will be described later. That is, the A-code 3 is connected to the connector 24, and the electrode 14 is connected to the high-frequency output line 34 in the A-code 3 via the conducting part 25 and the contact pin 30 of the connector 24.
[0028]
A light guide connector 26 is provided on the eyepiece 20 of the optical viewing tube 12. The light guide connector 26 is connected to the light guide cable 2 through which the light guide fiber bundle is inserted. The light guide fiber bundle (not shown) is connected to the light guide fiber bundle (not shown) on the eyepiece section 20 side by the connector 26. The light guide fiber bundle is installed so as to extend inside the optical viewing tube 12 to the distal end of the insertion section 19.
[0029]
An eyepiece optical system 45 is built in the eyepiece unit 20, and a transmission optical system (for example, parallel to the light guide fiber bundle) from the eyepiece optical system 45 toward the distal end of the insertion unit 19 is provided. An image guide fiber bundle (not shown) is provided. Further, an objective optical system (not shown) is arranged at the distal end of the insertion section 19 so as to face the transmission optical system.
[0030]
The slider 15 is provided with a hall element 28 which is movement detection means (operation part handle position detection means) for detecting the amount of projection movement of the electrode 14 by movement of the slider 15 at a fitting portion with the guide shaft 18. . On the other hand, as shown in FIG. 3, the outer peripheral portion of the guide shaft 18 is magnetized such that the region RN on the operation unit main body 17 side is magnetized to the N pole and the region RS on the stopper 16 side is S pole.
[0031]
The Hall element 28 is connected to the connector 24 side by a coaxial signal line 29 which is a shield line disposed in the slider 15, and is connected to the connector 24 via a contact pin 30 which is a contact having a shield grounded at the connector 24. 3 is connected to a coaxial signal line 31 (FIG. 5) which is a grounded shield line.
[0032]
When the slider 15 is moved back and forth by operating the finger rest 22 in the resectoscope 1, the protruding position of the electrode 14 with respect to the insertion portion 19 and the sheath 13 changes. The magnetized area of the guide shaft 18 is detected by the Hall element 28 in response to the movement of the electrode 14, and an electric signal indicating the projecting position of the electrode 14 is output.
[0033]
The camera head 4 includes an eyepiece mount 44 detachably attached to the eyepiece section 20 of the optical viewing tube 12 as shown in FIG. 4, and an eyepiece section 44 in the attached state as a component of a camera-side observation optical system. A cover glass 48 facing the eyepiece optical system 45, a mirror 49 disposed behind the cover glass 48 for reflecting light rays from the eyepiece optical system 45 toward the imaging optical system 50, and supported to be able to advance and retreat below the mirror 49. A lens frame 52, an imaging optical system 50 held by the lens frame 52, and an image sensor 51 disposed below the imaging optical system 50. A driving screw 54, which is a focus position changing unit and a field changing unit, is driven by a driving motor 53, and is electrically connected to the electric signal line 42 of the image sensor 51 and the driving motor 53. Line 43 is a camera cable 7 for inserting.
[0034]
In the camera head 4, the subject light incident from the eyepiece optical system 45 passes through the cover glass 48, is reflected by the mirror 49, and is imaged by the imaging optical system 50 on the image plane of the image sensor 51. . When the driving screw 54 is driven to rotate forward or backward by the driving motor 53, the lens frame 52 is driven forward and backward, and the focusing optical system 50 is driven.
[0035]
The high-frequency power supply device 6 has a monopolar configuration having a counter electrode plate 32 as shown in FIG. 5, and includes a power supply circuit 38A, a high-frequency output circuit 36, a control circuit 37, a transformer 35, and movement detection means. It has a certain slide position detection circuit 39, a return electrode plate 32 and a foot switch 33 connected to the outside of the high-frequency power supply device main body, and further has an A code 33, an electric signal cable 11, and a commercial power supply cord connected thereto.
[0036]
In the high-frequency power supply 6, the power supply circuit 38A to which the commercial power cord is connected supplies driving power to the high-frequency output circuit 36, the control circuit 37, the transformer 35, and the slide position detection circuit 39.
[0037]
The output signal line of the foot switch 33 is connected to the control circuit 37, and the high frequency output circuit 36 is controlled by the control circuit 37 based on the output signal of the foot switch 33. The output of the high-frequency output circuit 36 is connected to the primary side of the transformer 35. The secondary side of the transformer 35 is connected to a high-frequency output line 34 that passes through the inside of the A-code 3 connected to the slider 15 and a counter electrode plate 32.
[0038]
The slide position detection circuit 39 is connected to the coaxial signal line 31 passing through the A code 3, and the output signal line of the slide position detection circuit 39 is connected to the processor device 8 through the electric signal cable 11. You.
[0039]
As shown in FIG. 6, the processor unit 8 includes a power supply circuit 38B, an image sensor driving circuit / video signal processing circuit 40, and an optical system driving circuit as a focus position control unit for driving the driving motor 53 (FIG. 4). 41, and the camera cable 7 to the camera head 4, the electric signal cable 11 to the high-frequency power supply 6, the electric signal cable 9 to the observation monitor 10, and the commercial power cord are respectively connected. Have been.
[0040]
The power supply circuit 38B to which the commercial power cord is connected supplies drive power to the image pickup device drive circuit / video signal processing circuit 40 and the optical system drive circuit 41.
[0041]
The electric signal lines 42 and 43 through which the camera cable 7 is inserted are connected to an image sensor driving circuit / video signal processing circuit 40 and an optical system driving circuit 41, respectively. The output signals of the imaging element driving circuit / video signal processing circuit 40 and the optical system driving circuit 41 are output via the electric signal cable 11 or 9.
[0042]
Next, the operation of the endoscope device 81 according to the first embodiment having the above-described configuration will be described.
[0043]
First, the control circuit 37 causes the high-frequency output circuit 36 to output a high-frequency current by operating the foot switch 33 connected to the high-frequency power supply 6. The output voltage due to the current from the high-frequency output circuit 36 is transformed by the transformer 35, output from the high-frequency power supply 6, passed through the high-frequency output line 34 in the A-code 3, and further from the connector 24 of the resectoscope 1. It reaches the electrode 14 via the part 25. A high-frequency current flows from the electrode 14 to a patient's body tissue (not shown), and cauterization, ablation, coagulation, and the like of the patient's body tissue are performed. The high-frequency current that has flowed into the patient's body tissue returns to the high-frequency power supply device 6 through the return electrode plate 32 provided on the same patient's body surface.
[0044]
When performing the above-mentioned cauterization, resection, coagulation, etc. of the patient's body tissue, the surgeon places his / her finger on the finger hooks 22 and 23 of the resectoscope 1, slides the slider 15, moves the electrode 14 back and forth, and moves the electrode 14. Can expand the range of body tissue that can be treated, and cauterize, ablate, and coagulate the wide area. In this case, the range in which the electrode 14 can be moved back and forth is indicated by a moving range R0 in FIG.
[0045]
On the other hand, the illuminating light output from the light source device 5 is input to the resectoscope 1 from the light guide connector 26 via the light guide cable 2 and is inserted into the light guide fiber bundle (in the insertion portion 19 in the resect scope 1). (Not shown), and is emitted from the distal end of the insertion portion 19 to illuminate the inside of the patient's body cavity. The illuminating light illuminating the inside of the patient's body cavity is reflected by the tissue in the body cavity, transmitted through the objective optical and transmission optical systems (not shown) in the resectoscope 1 as endoscope optical image light, and is connected to the eyepiece optical system. It is emitted from 45. Then, an image is formed on the image forming surface of the image sensor 51 via the cover glass 48, the mirror 49, and the image forming optical system 50 in the camera head 4.
[0046]
The image pickup device 51 is driven by a drive signal output via an electric signal line 42 by an image pickup device driving circuit / video signal processing circuit 40 in the processor device 8 and forms an image on an image forming surface of the image pickup device 51. The obtained endoscope optical image is captured and converted into an electrical imaging signal. The electrical imaging signal is output to the imaging device driving circuit / video signal processing circuit 40 via the electrical signal line 42 again. The image sensor driving circuit / image signal processing circuit 40 converts the input image signal into an electric image signal, and outputs the image signal from the processor device 8 to the observation monitor 10 via the electric signal cable 9. Is done. An endoscopic image based on the input video signal is displayed on the screen of the observation monitor 10.
[0047]
By the above-described operation, the operator can cauterize, ablate, coagulate, etc. the patient's body tissue using the electrodes 14 while observing the endoscopic image on the screen of the observation monitor 10.
[0048]
Here, the focus position in the patient's body cavity and the depth of field in the observation scope of the resectoscope 1 and the camera head 4 of the endoscope device 81 will be described.
[0049]
In a state where the finger hook 22 of the resectoscope 1 is drawn closest to the stopper 16 side, the electrode 14 is located closest to the sheath 13 side of the movement range R0 shown in FIG. Then, the focus of the observation optical system of the resectoscope 1 and the camera head 4 is focused around the electrode 14 located at the position where the protrusion amount is small, and the depth of field is the depth of field S1 shown in FIG. It becomes.
[0050]
When the finger rest 22 of the resectoscope 1 is fully moved toward the operation unit main body 17, the electrode 14 is at the most protruding position in the movement range R0 in FIG. Then, the focus of the observation optical system of the resectoscope 1 and the camera head 4 is focused around the electrode 14 at the most protruding position, and the depth of field is relatively deep as shown in FIG. The depth is changed to S2. For these adjustments, the movement position of the slider 15 is detected by the hold element 28 embedded in the slider 15, the drive screw 54 is driven via the drive motor 53 based on the detection signal, and the imaging optical system 50 is moved forward and backward. It is automatically controlled by driving.
[0051]
That is, when the slider 15 moves, the Hall element 28 moves on the guide shaft 18 to detect the polarity of the magnetic force of the guide shaft 18, and the detection result is converted into an electric signal through the coaxial signal lines 29, 30, and 31. The signal is output to the slide position detection circuit 39 in the power supply device 6. Based on the input detection signal, for example, the slide position detection circuit 39 indicates a positive signal when the detection signal indicates the polarity “N”, and conversely, the detection signal indicates the polarity “S” based on the input detection signal. In this case, a negative voltage signal is output to the electric signal cable 11 outside the high frequency power supply 6. The output detection signal is input to the optical system drive circuit 41 in the processor device 8 via the electric signal cable 11. For example, when the input detection signal is positive, the optical system driving circuit 41 outputs a forward-biased motor driving voltage to the driving motor 53 via the electric signal line 43. On the other hand, when the input detection signal is negative, the optical system drive circuit 41 outputs a reverse-biased motor drive voltage to the drive motor 53 via the electric signal line 43.
[0052]
When the input drive voltage is reverse bias, for example, the drive motor 53 rotates in the reverse direction, and the lens frame 52 is moved by the drive screw 54 so that the depth of field of the resectoscope 1 is within the range. 2 is moved to a position in a range S1 close to the distal end of the sheath 13 shown in FIG. When the movement of the lens frame 52 to the position is completed, the lens frame 52 comes into contact with a stopper (not shown), and stops without moving any further.
[0053]
Conversely, when the drive voltage input to the drive motor 53 is a forward bias, the drive motor 53 rotates, for example, in the forward direction, and the lens frame 52 is driven by the The Zectoscope is moved so that the depth of field range is located in a range S2 shown in FIG. When the movement of the lens frame 52 to the position is completed, the lens frame 52 comes into contact with a stopper (not shown), and stops without moving any further.
[0054]
As described above, according to the endoscope apparatus 81 of the present embodiment, when the electrode 14 of the resectoscope 1 is at a position away from the distal end of the sheath 13, the depth of field of the observation optical system of the resectoscope 1 Is in the range S2, and when the electrode 14 is located near the distal end of the sheath 13, the observation optical system is automatically adjusted so that the depth of field of the resectoscope 1 is in the range S1. Therefore, at the time of use, the surgeon can always observe a clear image in which the electrode 14 is in focus without manually adjusting the focus of the optical system. Naturally, the position of the tissue in the body cavity where cauterization, resection, coagulation, or the like is to be performed by the electrode 14 is near the electrode 14, so that the tissue is always observed in a focused and clear image.
[0055]
In addition, since the eyepiece section 20 applied to the resectoscope 1 has a small depth of field, it is not necessary to widen the internal optical system or to configure an optical aperture, and it is possible to have an appropriate viewing angle. It is possible to obtain the brightest endoscope image. Further, since it is not necessary to additionally provide an image signal contrast detection circuit for autofocus or a special circuit or configuration for distance measurement, the system can be configured at low cost.
[0056]
In the endoscope 81 according to the first embodiment, the above-described operation and effect can be obtained by moving the lens frame 52 stepwise. If the range of the depth of field can be set to a plurality of in-focus positions, for example, the lens frame position disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 8-136683, unnatural changes in image in focusing can be reduced. . Further, if the position of the electrode 14, that is, the position of the slider 15 is detected not stepwise but continuously, and the lens frame 52 is continuously and linearly moved corresponding to each position, a continuous It is possible to obtain a continuous change in the focus position and a continuous change in the depth of field.
[0057]
Further, in the endoscope device 81 of the first embodiment, the position detection of the slider 15 along the guide shaft 18 is performed by the magnetic detection using the Hall element 28. However, the present invention is not limited to this configuration. It is also possible to apply a generally known sensor for detecting the position. For example, one that detects an electric resistance value that changes at the position of the slider 15 (for example, a variable resistor), one that uses an optical sensor that reads a marking displayed on the guide shaft 18, and the position of the slider 15 Various configurations having a configuration for detecting a change in the shape of the guide shaft 18 due to the above can be applied. Further, a configuration in which a rotation angle sensor is provided in the joint portion 55 of the spring joint 21 is also applicable.
[0058]
Further, the drive mechanism of the lens frame 52 is not limited to the drive motor 53 and the drive screw 54, and any known drive mechanism for an optical system can be used. It may be adopted.
[0059]
Next, an endoscope system as a modification of the endoscope device 81 of the first embodiment described above will be described with reference to FIGS. Note that the same control elements applied to the endoscope device 81 of the first embodiment will be described with the same reference numerals used in the description of the first embodiment.
FIG. 7 is a schematic diagram illustrating the entire configuration of an endoscope system according to the present modification. FIG. 8 is a block diagram of an autofocus control device included in the endoscope system according to the present modification.
[0060]
As shown in FIG. 7, an endoscope system 82 of this modification is a device in which another control unit or an endoscope is detachably connected to the endoscope device 81 of the first embodiment. is there.
[0061]
That is, in the endoscope system 82 of this modified example, the connection terminal 63 to which the electric signal cable 11 is detachably connected to the processor device 8 applied to the endoscope device 81 of the first embodiment. In addition, a connection terminal 64 for detachably connecting the electric signal cable 9 and a connection terminal 70 to which a video signal input terminal connector 69 can be connected are provided. The connection terminals 64 and 70 are terminals for outputting a video signal.
[0062]
In addition, the scope and endoscope connected to the light source device 5 and the processor device 8 are not limited to the scope 1, but may be a general electronic endoscope 65, an optical endoscope 66, and a camera. A combination of the heads 4B can also be connected.
[0063]
The electronic endoscope 65 is applied to, for example, an endoscope device 83 of a second embodiment described later, or described in Japanese Patent Application Laid-Open Nos. Hei 10-179506 and Hei 10-118007. The optical system focus adjustment drive mechanism as applied to the electronic endoscope apparatus disclosed in JP-A-2003-157421 is incorporated.
[0064]
In addition to the electric signal cable 11 of the high-frequency power supply 6, devices such as an autofocus control device 67, a treatment tool 73, and a special light source device 75, which will be described later, are detachably connected to the connection terminal 63 of the processor device 8. I can do it. All of the connectors to be attached and detached from the above devices are compatible with each other with respect to the connection terminal 63. The form of the signal input to the connection terminal 63 may be, for example, a simple positive or negative voltage signal as described above in the endoscope device 81 of the first embodiment.
[0065]
As shown in FIG. 8, the auto focus control device 67 is provided with a focus drive signal output terminal connector 68 connected to the connection terminal 63 and a video signal input terminal connector 69 connected to the connection terminal 70. I have.
[0066]
In the auto-focus control device 67, a video signal input terminal connector 69 is connected to a focus signal detection circuit 71, and an output of the focus signal detection circuit 71 is connected to a remote switch 72. Further, the output of the remote switch 72 is connected to the focus drive signal output terminal connector 68.
[0067]
The focus signal detection circuit 71 has, for example, a configuration like an autofocus control device of an endoscope device described in Japanese Patent Application Laid-Open No. H10-118008 and Japanese Patent Application Laid-Open No. H10-165358. Further, as in the case of the electronic endoscope apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 10-118007, contrast information of an endoscope image can be detected from a video signal.
[0068]
The treatment tool 73 is provided with a remote switch 72 having a switch portion 74, and the remote switch 72 has a focus drive signal output terminal connector 68 connected to the connection terminal 63 of the processor device 8, For example, it has a configuration like an optical endoscope disclosed in the above-mentioned JP-A-2001-46333. Note that a foot switch 76 having a switch section 74 may be mounted instead of the remote switch 72.
[0069]
The special light source device 75 is configured so that the operator can arbitrarily switch the illuminating light emitted from the light guide socket 60 to, for example, visible light, infrared light, or ultraviolet light. The special light source device 75 is provided with a focus drive signal output terminal connector 68 connected to the processor device 63.
[0070]
In the endoscope system 82 according to this modification having the above-described configuration, the focus drive signal output terminal connector 68 of the autofocus control device 67 is connected to the connection terminal 63 of the processor device 8, and the video signal input terminal connector 69. Are connected to the connection terminals 70 of the processor device 8, respectively, the focus signal detection circuit 71 of the autofocus control device 67 detects the focus state based on the input video signal, and based on the defocus state. The detection signal is output to the remote switch 72. The remote switch 72 outputs a focus drive signal to the processor device 8 based on the input detection signal. The focus drive signal is taken into an optical system drive circuit 41 (FIG. 6) built in the processor device 8, and a drive signal of a positive or negative voltage for a drive motor 53 built in the camera head is sent to the camera cable 7. Is output through The drive motor 53 is built in the camera head 4 of the resectoscope 1, the camera head 4B of the optical endoscope 66, the electronic endoscope 65, and the like, and drives the lens frame for holding the imaging optical system to move forward and backward. It is a motor.
[0071]
By connecting the autofocus control device 67 as described above, it is also possible to configure an electronic endoscope device having an autofocus function based on the contrast of a video signal or an imaging device for an endoscope. Note that the signal output from the connection terminal 70 of the processor device 8 and input to the focus signal detection circuit 71 of the autofocus control device 67 need not be limited to a video signal. The output signal of the imaging device as shown in the endoscope apparatus and the signalized signal of the position of the lens frame 52 may be input together.
[0072]
When the remote switch 72 of the treatment tool 73 or the focus drive signal output terminal connector 68 of the foot switch 76 is connected to the connection terminal 63 of the processor device 8, the operator operates the switch unit 74 so that the remote switch A positive or negative voltage signal is output to the focus drive signal output terminal connector 68 from the switch 72 or the foot switch 76. According to this configuration, the surgeon can operate the remote switch 72 or the foot switch 76 to adjust the focus of the camera head 4 of the resectoscope 1 and the electronic endoscope 65.
[0073]
When the focus drive signal output terminal connector 68 of the special light source device 75 is connected to the connection terminal 63 of the processor device 8, the special light source device 75 responds to switching of the illuminating light emitted from the light guide socket 60. Thus, positive and negative voltage signals are output from the focus drive signal output terminal connector 68. Generally, the focal length of the camera head 4 and the optical system of the electronic endoscope 65 varies depending on the wavelength of the illuminating light. For example, even if the focus is adjusted under visible illuminating light, switching the illuminating light to infrared light in that state causes a problem that the focus shifts. However, if the special light source device 75 as described above is applied, it is possible to adopt a mode in which the focus is automatically corrected according to the switching of the illuminating light. Therefore, the operator does not need to adjust the focus again, and the usability is improved.
[0074]
As described above, according to the endoscope system 82 of the present modified example, various endoscopes other than the resectoscope 1 are provided by giving various compatibility to devices connectable to the connection terminal 63 of the processor device 8. With respect to the mirror system, measures can be taken to adjust the focus remotely or automatically.
[0075]
In addition, in addition to the special light source device 75, the treatment tool 73, and the foot switch 76, devices that can be connected to the connection terminal 63 of the processor device 8 include, for example, a communication terminal for telemedicine operation, There is an aperture position detection output terminal of a light source as disclosed in Japanese Utility Model Application Laid-Open No. 63-78915 described above.
[0076]
Further, the driving method based on the signal input to the connection terminal 63 of the processor device 8 in this modification is not limited to the focus driving of the observation optical system, but the zoom driving of the observation optical system, or the above-described Japanese Patent Application Laid-Open No. H10-309258. The present invention can also be applied to a view direction changing drive as disclosed in Japanese Patent Application Laid-Open No. 11-501850 and Japanese Patent Application Laid-Open No. 11-501850.
[0077]
《75》
For example, a zoom drive circuit of an observation optical system is built in the processor device 8, a connection terminal 63 is connected to a zoom signal output terminal connector of an auto zoom control device (not shown), and a connection terminal 70 is connected to the auto terminal. Connect the video signal input terminal connector to the zoom control device. The auto-zoom control device calculates a zoom ratio from the video signal so that the size of the endoscopic image on the monitor screen is always 100%, and outputs the zoom signal to the processor device 8. % Of the endoscope image can be displayed on the observation monitor 10. The zoom ratio can be calculated by monitoring the luminance of the uppermost line and the lowermost line of the image. In addition, the form of the control signal input to the connection terminal 63 needs to be shared in order to ensure compatibility.
[0078]
Next, an endoscope apparatus according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 9 is a diagram illustrating the entire configuration of the endoscope apparatus according to the second embodiment. FIG. 10 is a cross-sectional view showing a detailed structure of a resectoscope constituting the endoscope apparatus. FIG. 11 is a block diagram of a light source device constituting the endoscope device.
[0079]
Regarding the configuration of the endoscope device 83 of the second embodiment, only the components different from those of the endoscope device 81 of the first embodiment will be described by assigning new reference numerals, and The same components as those of the endoscope device 81 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0080]
As shown in FIG. 9, the endoscope device 83 of this embodiment includes a resect scope 91, an A-code 3 and a light guide cable 2 connected to the resect scope 91, and The high-frequency power supply 6 connected via the cord 3, the light source device 95 connected to the resect scope 91 via the light guide cable 2, and the light source device 95 connected via the electric signal cable 9 And an observation monitor 10 to be operated.
[0081]
As shown in FIG. 10, the resect scope 91 includes an electronic endoscope 56, a sheath 13 mounted on the operation section main body, the electrode 14, the slider 15, and the operation section main body 17.
[0082]
The electronic endoscope 56 includes three parts: an insertion portion 19 inserted into the sheath 13, a hollow guide shaft 57, and an endoscope main body 58.
[0083]
The operation section main body 17 is fixed to an end of the guide shaft portion 57, and the guide shaft portion 57 is inserted through the slider 15.
[0084]
The slider 15 has a structure similar to that of the first embodiment, and is supported so as to be reciprocally slidable between the operation unit main body 17 and the endoscope main body 58 along the guide shaft 57. Have been. A current-carrying portion 25 of the electrode 14 inserted through the insertion passage in the sheath 13 is fixedly supported on the slider 15, and a connector 24 for connecting an A-code 3 having a built-in lead wire to the electrode 14 is provided. Further, a finger hook 22 is provided. The spring joint 21 is arranged between the slider 15 and the endoscope main body 58.
[0085]
The electrode 14 is provided so as to protrude from the distal end of the sheath 13, and the protruding position from the distal end of the sheath 13 changes according to the sliding movement of the slider 15.
[0086]
A transmission optical system 47 is inserted into the guide shaft portion 57 along the light guide fiber bundle 27. The transmission optical system 47 is inserted through the insertion section 19 and is arranged to face an objective lens (not shown) arranged at the tip of the insertion section 19.
[0087]
The guide shaft 57 is provided with two Hall elements 28a and 28b, which are two movement detecting means. On the other hand, the slider 15 is provided with a magnet 59 as movement detection means. The lead wires of the Hall elements 28a and 28b are connected to a slide position detecting circuit 39 in an endoscope main body 58 described later via a light guide socket (not shown) in the guide shaft 57.
[0088]
The endoscope body 58 includes a light guide connector 26, a finger hook 23, a movable lens frame 52 for holding an imaging optical system 50, an imaging element 51, an electric signal line 42, and a sliding position. A detection circuit 39, an optical system drive circuit 41, a drive motor 53, and a drive screw 54 driven by the drive motor 53 and screwed to the lens frame 52 are provided. The imaging optical system 50 held by the lens frame 52 is disposed to face the end of the transmission optical system 47.
[0089]
The light guide cable 2 is connected to the light guide connector 26. A light guide fiber bundle 27 is provided in the light guide connector 26 in the same configuration as that of the resectoscope 1.
[0090]
The slide position detection circuit 39 is connected to lead wires of the Hall elements 28a and 28b, and the output signal of the slide position detection circuit 39 is input to the optical system drive circuit 41, and the output signal of the optical system drive circuit 41 As a result, the drive motor 53 is driven. A drive screw 54 screwed to the lens frame 52 is fixed to the output shaft of the drive motor 53. The lens frame 52 holds an imaging optical system 50. Therefore, when the drive motor 53 is driven to rotate, the imaging optical system 50 held by the lens frame 52 is driven forward and backward along the optical axis.
[0091]
An image sensor 51 is arranged at an optical image plane position of the image forming optical system 50, and a subject image captured via the objective optical system forms an image on the image forming surface of the image sensor 51.
[0092]
The electric signal line 42 connected to the imaging element 51 passes through the light guide cable 2 via the light guide connector 26 and is connected to the light source device 95 (FIG. 11).
[0093]
The slide position detection circuit 39 is provided in the endoscope main body 58 as described above. Therefore, the slide position detection circuit 39 is not built in the high-frequency power supply 6 according to the present embodiment, so that there is no coaxial signal line 31 in the A code 3 of the high-frequency power supply 6 and the electric signal cable 11 is also connected. It has not been.
[0094]
As shown in FIG. 11, the light source device 95 includes a power supply circuit 38, a lamp 61, a condenser optical system 62, an image sensor driving circuit / video signal processing circuit 40, and a light guide cable. A light guide socket 60 to which the power supply 2 is connected is provided, and an electric signal cable 9 connected to the observation monitor 10 and a commercial power cord are connected.
[0095]
When the light guide cable 2 is attached to the light guide socket 60 of the light source device 95, the end face of the light guide fiber bundle 27 is optically connected to the lamp 61 and the condensing optical system 62. The electric signal line 42 from the image sensor 51 that has passed through the light guide cable 2 is connected to the image sensor drive circuit / video signal processing circuit 40 via a contact portion.
[0096]
The power supply line of the power supply circuit 38 connected to the commercial power supply is connected to the lamp 61 and the image sensor driving circuit / video signal processing circuit 40.
[0097]
Next, the operation of the endoscope device 83 according to the second embodiment having the above-described configuration will be described.
[0098]
The illuminating light emitted from the lamp 61 of the light source device 95 is condensed by the condensing optical system 62 and enters the light guide fiber bundle 27 in the light guide cable 2, and is connected to the light guide connector of the resect scope 91. The light passes through the light guide fiber bundle 27 in the resectoscope 91 through 26 and is emitted from the distal end of the insertion portion 19 to irradiate the inside of the patient's body cavity. The irradiated endoscope optical image of the tissue in the body cavity is formed on the image sensor 51 via the objective optical system (not shown), the transmission optical system 47, and the imaging optical system 50 in the electronic endoscope 56. I do.
[0099]
The image sensor 51 is driven by being supplied with a drive signal and power from the image sensor drive circuit / video signal processing circuit 40 in the light source device 95 via the electric signal line 42 and is driven. Is converted into an electric image signal by the image sensor 51, and the image signal is output to the image sensor driving circuit / image signal processing circuit 40 in the light source device 95 via the electric signal line. The image sensor driving circuit / image signal processing circuit 40 processes the input image signal and outputs an image signal to the observation monitor 10 via the electric signal cable 9. The subsequent operation is the same as that of the endoscope device 81 of the first embodiment.
[0100]
The electrode 14 moves in a movement range R0 (FIG. 10) by reciprocatingly sliding the slider 15. The Hall elements 28 a and 28 b detect the relative position of the slider 15 on the guide shaft portion 57 by detecting the magnetic force of the magnet 59. The detection signals output from the Hall elements 28a and 28b are input to a slide position detection circuit 39. The slide position detection circuit 39 and the optical system drive circuit 41 drive the drive motor 53 and the drive screw 54, and furthermore, the lens frame 52 forward and backward by the same operation as in the first embodiment, and the electrode 14 and the slider 15 , The focus position of the electronic endoscope 56 and the depth of field thereof are automatically switched between the range S1 and the range S2.
[0101]
As described above, also in the endoscope device 83 of the second embodiment, the same effect as in the case of the endoscope device 81 of the first embodiment can be obtained. In particular, in the endoscope device 83 of the second embodiment, the configuration of the processor device 8, the camera head 4, the camera cable 7, and the like is different from the endoscope device 81 of the first embodiment. Since it can be eliminated, there is an advantage that the configuration is simplified, no trouble is required in connection of equipment and preparation work, and the system can be configured at low cost. Further, since the electric signal line for detecting the position of the slider 15 does not need to be inserted through the A-code 3, the electromagnetic signal such as radiated electromagnetic noise of high-frequency current generated when the electric signal line is inserted through the A-code 3. There is also an advantage that there is no need to be affected, and there is less concern about malfunction or the like.
[0102]
Next, a modified example of the resectoscope 91 included in the endoscope device 83 according to the second embodiment will be described with reference to FIG.
[0103]
The resect scope 91A of this modified example is capable of changing the depth of field of the observation optical system according to the position of the slider 15. That is, in the electronic endoscope 56A of the resectoscope 91A of the present modified example, as shown in FIG. The stop amount of the automatic stop mechanism 102 as the changing means with respect to the imaging optical system 50 is controlled. Accordingly, the electronic endoscope 56A of the resectoscope 91A of the present modified example is different from the optical system drive circuit 41, the drive motor 53, and the drive of the electronic endoscope 56 of the resectoscope 91 applied to the second embodiment. The aperture control circuit 101 and the automatic aperture mechanism 102 are arranged in place of the screw 54, and the imaging optical system 50 is not driven forward and backward. Other than that, they have substantially the same configuration, and the same reference numerals are given to the same components in FIG.
[0104]
In the reject scope 91A of this modification, the automatic aperture mechanism 102 is driven by the aperture control circuit 101 in accordance with the positions of the electrode 14 and the slider 15, and the optical aperture amount of the imaging optical system 50 is changed. I have. The electrode 14 is driven during the range R0 shown in FIG. 12. When the electrode 14 is located farther than the sheath 13, the aperture is opened by the automatic aperture mechanism 102. The depth of field of the zectoscope 91A is set, for example, in the range of the depth of field S3. Conversely, when the position of the electrode 14 is closer to the sheath 13, the aperture is stopped down by the automatic stop mechanism 102, so that the depth of field of the rejects hoop 91 </ b> A is improved, and a wider range of the depth of field S 4. Become. In the state where the automatic aperture mechanism 102 is stopped down, the depth of field is improved and the amount of light incident on the image sensor 51 is reduced, so that the field farther than the sheath 13 is dark and hard to visually recognize. At this time, since what is actually visually recognized is the electrode 14 near the sheath 13 and the subject to be treated by the electrode 14, there is no trouble in observation.
[0105]
The following configuration is obtained based on each of the above-described embodiments or modifications thereof. That is,
(Supplementary Note 1) An endoscope optical system that is inserted into a patient's body cavity and transmits an optical image of tissue in the body cavity, and an imaging device that captures an optical image transmitted and formed by the endoscope optical system and converts the optical image into an electric signal. And, by reciprocating the operation unit handle, in the endoscope resect scope having a high-frequency output electrode for reciprocating in conjunction with the handle, cauterizing the patient's body tissue, ablation, coagulation, etc.
Depth of field in the patient's body cavity of the endoscope optical system, and / or a field position changing unit that changes a focus position;
Operating part handle position detecting means for detecting the position of the operating part handle,
Wherein the field position changing means changes the depth of field and / or the focus position of the endoscope optical system based on the detection result by the operation portion handle position detecting means. An endoscope resectoscope device characterized by the above-mentioned.
[0106]
(Supplementary note 2) The endoscope according to Supplementary note 1, wherein the endoscope optical system is separable into an insertion part to be inserted into a patient's body cavity and an imaging element imaging part including the imaging element. Mirror resectoscope device.
[0107]
(Supplementary Note 3) A long insertion portion that can be inserted into the subject,
Treatment means projecting from the distal end of the insertion portion and capable of treating the subject,
An insertion passage provided in the insertion portion and through which the treatment means can be inserted;
An observation optical system capable of observing an optical image,
Focus position changing means capable of changing the focus position of the observation optical system,
Movement detection means for detecting movement of the treatment means with respect to the insertion passage;
Focus position control means capable of controlling the focus position changing means so as to change the focus position of the observation optical system in accordance with the movement of the treatment means detected by the movement detection means;
An endoscope apparatus comprising:
[0108]
(Supplementary Note 4) The endoscope apparatus according to Supplementary Note 3, further comprising an operation unit configured to move the treatment unit with respect to the insertion passage.
[0109]
(Supplementary Note 5) The endoscope apparatus according to Supplementary Note 3, wherein the movement detection unit detects a protrusion of the treatment unit with respect to a distal end portion of the insertion unit.
[0110]
(Supplementary note 6) The endoscope apparatus according to supplementary note 4, wherein the movement detection unit detects an operation of the operation unit.
[0111]
【The invention's effect】
According to the present invention, an autofocus drive and / or an automatic iris drive of the endoscope apparatus are performed in accordance with the movement of the treatment means by a method which is simpler and cheaper than the conventional endoscope apparatus. The apparent depth of field of the observation optical system of the mirror device can be improved, and the operator can proceed with the procedure while always observing a bright and clear image focused on the treatment means. An endoscope device can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an overall configuration of an endoscope apparatus according to a first embodiment of the present invention.
FIG. 2 is a sectional view showing a detailed structure of a resectoscope constituting the endoscope apparatus of FIG. 1;
FIG. 3 is a sectional view showing a magnetized state of a guide shaft portion of the resectoscope of FIG. 2;
FIG. 4 is a sectional view showing a structure of a camera head constituting the endoscope apparatus of FIG. 1;
FIG. 5 is a block diagram of a high-frequency power supply circuit constituting the endoscope apparatus of FIG. 1;
FIG. 6 is a block diagram of a processor device constituting the endoscope device of FIG. 1;
FIG. 7 is a diagram showing an overall configuration of an endoscope system as a modified example of the endoscope apparatus according to the first embodiment of FIG. 1;
FIG. 8 is a block diagram of an autofocus control device included in the endoscope system according to the modified example of FIG. 7;
FIG. 9 is a diagram illustrating an overall configuration of an endoscope apparatus according to a second embodiment of the present invention.
FIG. 10 is a sectional view showing a detailed structure of a resectoscope constituting the endoscope apparatus of FIG. 9;
FIG. 11 is a block diagram of a light source device constituting the endoscope device of FIG. 9;
FIG. 12 is a cross-sectional view showing a structure of a modified example of a resectoscope in the endoscope apparatus according to the second embodiment of FIG. 9;
[Explanation of symbols]
13 ... sheath (insertion part, insertion passage)
14. Electrode (treatment means)
15 Slider (operation means)
19 ... Insertion part
39 slide position detection circuit (movement detection means)
41 ... Optical system drive circuit (focal position control means)
45 ... Eyepiece optical system (observation optical system)
46 Objective optical system (observation optical system)
47 ... Transmission optical system (observation optical system)
48 Cover glass (observation optical system)
49 Mirror (observation optical system)
50: Imaging optical system (observation optical system)
53 ... Drive motor (focal position changing means, field changing means)
54 Drive screw (focal position changing means, field changing means)
59: magnet (movement detecting means)
101 ... Aperture control circuit (field control means)
102 ... Automatic aperture mechanism (field changing means)

Claims (3)

A long insertion portion that can be inserted into the subject,
Treatment means projecting from the distal end of the insertion portion and capable of treating the subject,
An insertion passage provided in the insertion portion and through which the treatment means can be inserted;
An observation optical system capable of observing an optical image,
A focus position of the observation optical system, and a field changing unit that can change the depth of field,
Movement detection means for detecting movement of the treatment means with respect to the insertion passage;
Field control means capable of controlling the field changing means so as to change the focal position of the observation optical system and the depth of field according to the movement of the treatment means detected by the movement detecting means When,
An endoscope apparatus comprising: A long insertion portion that can be inserted into the subject,
Treatment means projecting from the distal end of the insertion portion and capable of treating the subject,
An insertion passage provided in the insertion portion, through which the treatment means can be inserted;
An observation optical system capable of observing an optical image,
Focus position changing means capable of changing the focus position of the observation optical system,
Movement detection means for detecting movement of the treatment means with respect to the insertion passage;
Focus position control means capable of controlling the focus position changing means so as to change the focus position of the observation optical system in accordance with the movement of the treatment means detected by the movement detection means;
An endoscope apparatus comprising: A long insertion portion that can be inserted into the subject,
Treatment means projecting from the distal end of the insertion portion and capable of treating the subject,
An insertion passage provided in the insertion portion and through which the treatment means can be inserted;
An observation optical system capable of observing an optical image,
Depth of field changing means capable of changing the depth of field of the observation optical system,
Movement detection means for detecting movement of the treatment means with respect to the insertion passage;
Depth of field control means capable of controlling the depth of field changing means to change the depth of field of the observation optical system according to the movement of the treatment means detected by the movement detection means,
An endoscope apparatus comprising:

Images