Endoscope and tip body

Abstract

An endoscope comprising a tip body which is located at the tip of an insertion part to be inserted into a subject, and a first built-in component and a second built-in component the respective tips of which are housed in the tip body, wherein the tip body has: a first housing part extending along a first direction along the longitudinal direction of the tip body and housing the tip of the first built-in component; a first opening being in communication with the first housing part, opening toward at least a second direction and mating with the tip of the first built-in component; a second housing part being in communication with the first housing part, extending along the first direction at a position displaced in a third direction perpendicular to the first and second directions and housing the tip of the second built-in component; and a second opening being in communication with the second housing part, opening toward at least the second direction and mating with the tip of the second built-in component. The second direction is perpendicular to the first direction. Thus, provided is the endoscope which has a reduced diameter of the tip body, allows the attachment / detachment of two or more built-in components one by one, and is resistant to deterioration over time.

Description

Technical Field

[0001] The present invention relates to an endoscope and a tip body.

Background Art

[0002] Conventionally, an endoscope including an imaging unit that images inside a subject and an illumination unit that irradiates illumination light inside the subject is known. At the tip of an insertion unit inserted into a subject, the imaging unit and the illumination unit are housed inside the tip body.

[0003] Patent Document 1 describes an endoscope in which an imaging unit and an illumination unit are arranged side by side vertically inside a tip body. By arranging the imaging unit and the illumination unit side by side vertically, there is no need to provide a wall between the space for housing the imaging unit and the space for housing the illumination unit, so the diameter of the tip body can be reduced.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] It is preferable that built-in components such as an imaging unit and an illumination unit can be individually attached and detached during repair. However, in a forward-viewing or side-viewing endoscope, since the tips of the imaging unit and the illumination unit are curved, when the imaging unit and the illumination unit are arranged side by side vertically, there is a problem that it becomes difficult to individually insert and remove the imaging unit and the illumination unit from the proximal end side.

[0006] The endoscope of Patent Document 1 has a lid assembled to the side surface of the tip body so as to cover the imaging unit and the illumination unit. In this configuration, although the built-in components can be individually attached and detached, the durability deteriorates due to the aging deterioration of the adhesive for adhering the lid.

[0007] The present invention has been made in view of the above, and an object thereof is to provide an endoscope and a distal end body that can reduce the diameter of the distal end body, can individually attach and detach two or more built-in objects one by one, and are less likely to deteriorate over time.

Means for Solving the Problems

[0008] In order to solve the above-described problems and achieve the object, an endoscope according to an aspect of the present invention includes a distal end body located at the distal end of an insertion portion inserted into a subject, and a first built-in object and a second built-in object each having a tip portion accommodated in the distal end body. The distal end body has a first accommodating portion that extends along a first direction along the longitudinal direction of the distal end body and accommodates the tip portion of the first built-in object, and a first opening that communicates with the first accommodating portion, opens at least in a second direction, and fits with the tip portion of the first built-in object. The distal end body also has a second accommodating portion that communicates with the first accommodating portion, extends along the first direction at a position shifted in a third direction orthogonal to the first direction and the second direction, and accommodates the tip portion of the second built-in object, and a second opening that communicates with the second accommodating portion, opens at least in the second direction, and fits with the tip portion of the second built-in object. The second direction is a direction orthogonal to the first direction.

[0009] Further, in the endoscope according to an aspect of the present invention, the first built-in object is an imaging unit that images a subject by converting light received from the outside on the distal end side into an image signal.

[0010] Further, in the endoscope according to an aspect of the present invention, the second built-in object is an illumination unit that irradiates illumination light toward the outside on the distal end side.

[0011] Further, in the endoscope according to an aspect of the present invention, the first opening is formed on the distal end side of the second opening and is separated from the second opening.

[0012] Further, in the endoscope according to an aspect of the present invention, the rear ends of the first built-in object and the second built-in object extend along the first direction at the same position in the third direction.

[0013] In addition, the endoscope according to one aspect of the present invention includes a treatment instrument lifting table that lifts the treatment instrument in the second direction, and the distal end main body extends along the first direction and has a treatment instrument insertion conduit through which the treatment instrument is inserted.

[0014] In addition, in the endoscope according to one aspect of the present invention, the first built-in object is an imaging unit that images a subject by converting light received from the outside on the distal end side into an image signal, the second built-in object is an illumination unit that irradiates illumination light toward the outside on the distal end side, the first opening is formed on the distal end side of the second opening, and is spaced apart from the second opening.

[0015] In addition, in the endoscope according to one aspect of the present invention, the rear ends of the first built-in object and the second built-in object extend along the first direction at the same position in the third direction.

[0016] In addition, the endoscope according to one aspect of the present invention includes a treatment instrument lifting table that lifts the treatment instrument in the second direction, and the distal end main body extends along the first direction and has a treatment instrument insertion conduit through which the treatment instrument is inserted.

[0017] In addition, the distal end main body according to one aspect of the present invention is a distal end main body located at the distal end of the insertion portion of the endoscope inserted into the subject, extends along a first direction along the longitudinal direction of the distal end main body, and has a first accommodating portion that accommodates the distal end portion of the first built-in object, communicates with the first accommodating portion, opens at least in the second direction, and fits with the distal end portion of the first built-in object. a first opening; a second accommodating portion that communicates with the first accommodating portion, extends along the first direction at a position shifted in a third direction orthogonal to the first direction and the second direction, and accommodates the distal end portion of the second built-in object; and a second opening that communicates with the second accommodating portion, opens at least in the second direction, and fits with the distal end portion of the second built-in object, wherein the second direction is a direction orthogonal to the first direction.

Advantages of the Invention

[0018] According to the present invention, an endoscope capable of reducing the diameter of the distal end body, individually attaching and detaching two or more built-in components one by one, and being less likely to cause deterioration over time, and a distal end body can be realized.

Brief Description of the Drawings

[0019]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0020] Hereinafter, embodiments of the endoscope and the distal end body according to the present invention will be described with reference to the drawings. Note that the present invention is not limited by these embodiments. In the following embodiments, a perspective endoscope and a distal end body will be exemplified and described, but the present invention can be generally applied to perspective and side-view endoscopes and distal end bodies.

[0021] In the description of the drawings, the same or corresponding elements are appropriately denoted by the same reference numerals. Also, the drawings are schematic, and it should be noted that the dimensional relationships between elements, the ratios of the elements, etc. may differ from reality. There may also be parts where the dimensional relationships and ratios between the drawings are different from each other.

[0022] (Embodiment) 〔Configuration of Endoscope System〕 FIG. 1 is a diagram schematically showing an endoscope system according to an embodiment. The endoscope system 1 is a system that performs ultrasonic diagnosis inside a subject such as a human using an ultrasonic endoscope. As shown in FIG. 1, this endoscope system 1 includes an ultrasonic endoscope 2, an ultrasonic observation device 3, an endoscope observation device 4, a display device 5, and a light source device 6.

[0023] The ultrasonic endoscope 2 is provided with an ultrasonic vibrator at its distal end. This ultrasonic vibrator converts the electrical pulse signal received from the ultrasonic observation device 3 into an ultrasonic pulse and irradiates the subject, and also converts the ultrasonic echo reflected by the subject into an electrical echo signal expressed by a voltage change and then outputs it.

[0024] The ultrasonic endoscope 2 has an imaging optical system and an imaging element, and is inserted into the digestive tract (esophagus, stomach, duodenum, large intestine) or respiratory tract (trachea, bronchus) of a subject, and can image either the digestive tract or the respiratory tract. In addition, it is possible to image the surrounding organs (pancreas, gallbladder, bile duct, biliary tract, lymph nodes, mediastinal organs, blood vessels, etc.) using ultrasonic waves. The ultrasonic endoscope 2 also has a light guide for guiding illumination light irradiated to the subject during optical imaging. The distal end of this light guide reaches the distal end of the insertion portion of the ultrasonic endoscope 2 into the subject, while the proximal end is connected to a light source device 6 that generates illumination light.

[0025] As shown in FIG. 1, the ultrasonic endoscope 2 includes an insertion portion 21, an operation portion 22, a universal cord 23, and a connector 24.

[0026] The insertion portion 21 is the portion inserted into the subject. As shown in FIG. 1, this insertion portion 21 is provided on the distal end side of the ultrasonic endoscope 2, and includes a rigid distal end body 211 that holds a convex ultrasonic vibrator 7, a bending tube 212 that bends in a bending direction orthogonal to the central axis, and a flexible insertion tube 213 having a central axis. The distal end body 211 is provided on the distal end side of the bending tube 212, the bending tube 212 is provided on the distal end side of the insertion tube 213, and the insertion tube 213 is provided on the distal end side of the operation portion 22. The configuration of the distal end of the insertion portion 21 and the configuration of the bending tube 212 will be described later.

[0027] The operation portion 22 is connected to the proximal end side of the insertion portion 21 and is the portion that receives various operations from an operator such as a doctor. As shown in FIG. 1, this operation portion 22 includes a bending knob 221 that receives a bending operation for bending the bending tube 212, and a plurality of operation members 222 for performing various operations. In addition, an instrument insertion port 223 that communicates with the instrument insertion passage and through which an instrument is inserted into the instrument insertion passage is formed in the operation portion 22.

[0028] The universal code 23 is a cable that extends from the operation unit 22 and in which a plurality of signal cables for transmitting various signals and an optical fiber or the like for transmitting illumination light supplied from the light source device 6 are arranged.

[0029] The connector 24 is provided at the tip of the universal code 23. The connector 24 includes a first connector portion 241 to which the ultrasonic cable 31 is connected, a second connector portion 242 to which the video cable 41 is connected, and a third connector portion 243 to which the optical fiber cable 61 is connected.

[0030] The ultrasonic observation device 3 is electrically connected to the ultrasonic endoscope 2 via the ultrasonic cable 31 (see FIG. 1), outputs a pulse signal to the ultrasonic endoscope 2 via the ultrasonic cable 31, and an echo signal is input from the ultrasonic endoscope 2. Then, the ultrasonic observation device 3 performs predetermined processing on the echo signal to generate an ultrasonic image.

[0031] The endoscope observation device 4 is electrically connected to the ultrasonic endoscope 2 via the video cable 41 (see FIG. 1), and inputs an image signal from the ultrasonic endoscope 2 via the video cable 41. Then, the endoscope observation device 4 performs predetermined processing on the image signal to generate an endoscope image.

[0032] The display device 5 is configured using a liquid crystal or an organic EL (Electro Luminescence), a projector, a CRT (Cathode Ray Tube), etc., and displays the ultrasonic image generated by the ultrasonic observation device 3, the endoscope image generated by the endoscope observation device 4, etc.

[0033] The light source device 6 is connected to the ultrasonic endoscope 2 via the optical fiber cable 61 (see FIG. 1), and supplies illumination light for illuminating the inside of the subject to the ultrasonic endoscope 2 via the optical fiber cable 61.

[0034] 〔Configuration of the tip of the insertion portion〕 Figure 2 is a view taken in the direction of arrow A in Figure 1. Figure 3 is a view taken in the direction of arrow B in Figure 2. Figure 4 is a view taken in the direction of arrow C in Figure 2. Hereinafter, the direction along the longitudinal direction of the tip body 211 is defined as the first direction D1, the direction orthogonal to the first direction is defined as the second direction D2, and the direction orthogonal to the first direction D1 and the second direction D2 is defined as the third direction D3.

[0035] As shown in FIGS. 2 to 4, on the tip body 211 located at the tip of the insertion portion 21, there are an imaging lens 101 that condenses light from the subject, an illumination lens 102 that irradiates illumination light into the subject, a treatment tool outlet 103 that projects a treatment tool such as forceps, a treatment tool lifting table 104 that lifts the treatment tool in the direction of the second direction D2, an air supply / water supply port 105 that discharges a gas such as air or a liquid such as water, a balloon water supply port 106 that sends a liquid such as water into the balloon, and a balloon suction port 107 that sucks a liquid such as water from inside the balloon.

[0036] 〔Configuration inside the tip body〕 Figure 5 is a cross-sectional view showing the configuration inside the tip body. As shown in Figure 5, inside the tip body 211, there are a signal cable 111 that transmits an image signal obtained by converting the light received by the imaging lens 101, a light guide 112 that transmits illumination light to the illumination lens 102, a channel tube 113 through which the treatment tool is inserted, a vibrator cable 114 that transmits signals to and from the ultrasonic vibrator 7, an air supply / water supply tube 115 that transmits a gas or a liquid to the air supply / water supply port 105, a balloon water supply tube 116 that transmits a liquid to the balloon water supply port 106, a balloon suction tube 117 that transmits the liquid sucked from the balloon suction port 107, a treatment tool lifting tube 118 through which the treatment tool lifting wire 119 is inserted, and a treatment tool lifting wire 119 that lifts the treatment tool lifting table in response to an operation on the operation unit 22.

[0037] 〔Configuration of the imaging unit〕 FIG. 6 is a diagram showing the configuration of the imaging unit. As shown in FIG. 6, the imaging unit 11, which is the first built-in component, includes an imaging lens 101 located at the tip, an imaging unit 121 including an imaging element that converts the light collected by the imaging lens 101 into an image signal, and a signal cable 111 that transmits the image signal generated by the imaging element to the endoscope observation device 4. The tip of the imaging unit 11 is housed inside the tip main body 211, and the imaging unit 11 images a subject by converting the light received from the outside on the tip side into an image signal. The symbol a in the figure will be described later (see the description of FIG. 14). Note that the imaging unit 121 may include optical elements such as lenses different from the imaging lens 101.

[0038] In the imaging unit 11, the direction of the axis Ax1 on the tip side having the imaging lens 101 is inclined with respect to the direction in which the signal cable 111 extends. More specifically, the rear end side of the imaging unit 121 extends along the first direction D1, and the tip side of the imaging unit 121 extends in the first direction D1 and the second direction D2. In other words, the imaging unit 121 is formed such that its axial direction bends in the middle.

[0039] 〔Configuration of Illumination Unit〕 FIG. 7 is a diagram showing the configuration of the illumination unit. As shown in FIG. 7, the illumination unit 12, which is the second built-in component, includes an illumination lens 102 located at the tip and an illumination unit 122 located on the proximal end side of the illumination lens 102. The illumination unit 122 includes a light guide 112 that transmits illumination light from the light source device 6. The tip of the illumination unit 12 is housed inside the tip main body 211, and irradiates illumination light toward the outside on the tip side. The symbols b and c in the figure will be described later (see the description of FIG. 14). Note that the illumination unit 122 may include a tube or a metal pipe that covers the light guide 112. Also, the illumination unit may not have a configuration including a light guide like the illumination unit 122. For example, the illumination unit may be composed of an LED (Light Emission Diode) and a wire that connects this LED and a power source.

[0040] In the illumination unit 12, the axial direction Ax2 on the tip side having the illumination lens 102 is inclined with respect to the direction in which the light guide 112 extends. More specifically, the rear end side of the illumination unit 122 extends along the first direction D1, and the front end side of the illumination unit 122 extends in the first direction D1 and the second direction D2. In other words, the illumination unit 122 is formed such that its axial direction bends midway.

[0041] 〔Configuration of the tip body〕 FIG. 8 is a cross-sectional view corresponding to the line E-E in FIG. 5. As shown in FIG. 8, in the tip body 211, an imaging housing portion 211a which is a first housing portion and an imaging opening 211b which is a first opening are formed.

[0042] The imaging housing portion 211a extends along the first direction D1 and houses the tip portion of the imaging unit 11.

[0043] The imaging opening 211b communicates with the imaging housing portion 211a and opens in the first direction D1 and the second direction D2. In other words, the imaging opening 211b opens at least in the second direction D2. Further, the tip portion of the imaging unit 11 is fitted into the imaging opening 211b.

[0044] FIG. 9 is a cross-sectional view corresponding to the line F-F in FIG. 5. As shown in FIG. 9, in the tip body 211, an illumination housing portion 211c which is a second housing portion and an illumination opening 211d which is a second opening are formed.

[0045] The illumination housing portion 211c communicates with the imaging housing portion 211a, extends along the first direction D1, and houses the tip portion of the illumination unit 12.

[0046] The illumination opening 211d communicates with the illumination housing portion 211c and opens in the first direction D1 and the second direction D2. In other words, the illumination opening 211d opens at least in the second direction D2. Further, the tip portion of the illumination unit 12 is fitted into the illumination opening 211d.

[0047] FIG. 10 is a view showing a part of the G arrow view of FIG. 8. As shown in FIG. 10, the imaging aperture 211b is formed on the tip side of the illumination aperture 211d and is spaced apart from the illumination aperture 211d.

[0048] FIG. 11 is a cross-sectional view of the tip body corresponding to the D-D line of FIG. 2. As shown in FIG. 11, the illumination aperture 211d extends along the first direction D1 at a position shifted in the third direction D3.

[0049] Furthermore, the tip body 211 has a treatment tool insertion pipe 211e along which a channel tube 113 through which a treatment tool is inserted is arranged, a vibrator cable insertion pipe 211f in which a vibrator cable 114 is arranged, an air and water supply pipe 211g in which an air and water supply tube 115 is arranged, a balloon water supply pipe 211h in which a balloon water supply tube 116 is arranged, a balloon suction pipe 211i in which a balloon suction tube 117 is arranged, and a treatment tool lifting pipe 211j in which a treatment tool lifting tube 118 and a treatment tool lifting wire 119 are arranged.

[0050] Specifically, the treatment tool insertion pipe 211e and the vibrator cable insertion pipe 211f are arranged near the center line CL along the second direction D2 in the third direction D3. When the direction of the second direction D2 is regarded as up and down, they are arranged one above the other. Further, an illumination housing portion 211c and a treatment tool lifting pipe 211j are formed so as to sandwich the treatment tool insertion pipe 211e. As will be described later, the imaging housing portion 211a and the illumination housing portion 211c communicate with each other. The air and water supply pipe 211g is formed on the lower side on the same side as the side where the illumination housing portion 211c with respect to the treatment tool insertion pipe 211e is arranged in the third direction D3. Also, the balloon water supply pipe 211h and the balloon suction pipe 211i are formed on the lower side in the second direction D2, the same as the vibrator cable insertion pipe 211f.

[0051] 〔Detachment of Imaging Unit and Illumination Unit〕 Figures 12 and 13 are diagrams showing the state of attaching and detaching the imaging unit. To attach and detach the imaging unit 11, it is necessary to slide the tip of the imaging unit 11 in the second direction D2 so that the imaging unit 11 shown in Fig. 12 is in a state of being fitted into the imaging opening 211b of the tip body 211 and then becomes the state where the imaging unit 11 shown in Fig. 13 is removed.

[0052] Figures 14 and 15 are diagrams showing the state of attaching and detaching the lighting unit. To attach and detach the lighting unit 12, it is necessary to slide the tip of the lighting unit 12 in the second direction D2 so that the lighting unit 12 shown in Fig. 14 is in a state of being fitted into the lighting opening 211d of the tip body 211 and then becomes the state where the lighting unit 12 shown in Fig. 15 is removed.

[0053] 〔Positional relationship between the imaging housing part and the lighting housing part〕 Figures 16 and 17 are diagrams for explaining the positional relationship between the imaging unit and the lighting unit. Fig. 16 shows the positional relationship in the direction orthogonal to the first direction D1. Fig. 17 shows the positional relationship in the direction along the first direction D1. The ellipse A1 in Fig. 16 represents the region through which the imaging lens 101 passes on the plane orthogonal to the first direction D1 when the imaging unit 11 is attached and detached, and has the shape of the imaging lens 101 seen from the proximal end side in Fig. 17. Also, the circle A2 in Fig. 16 represents the cross-section of the lighting unit 122 on the plane orthogonal to the first direction D1, and has the shape of the lighting unit 122 seen from the proximal end side in Fig. 17. In other words, the ellipse A1 in Fig. 16 is a view obtained by projecting the imaging lens 101 onto the H-H line cross-section in Fig. 17 and seen from the proximal end side. The circle A2 in Fig. 16 is a view of the cross-section of the lighting unit 122 on the I-I line in Fig. 17 seen from the proximal end side. If the ellipse A1 and the circle A2 do not overlap, the imaging unit 11 can be individually attached and detached to the tip body 211 while the lighting unit 12 is assembled to the tip body 211. Hereinafter, the condition for the ellipse A1 and the circle A2 to be in contact will be described.

[0054] In FIG. 16, symbol a represents the diameter of the imaging lens 101. Symbol b represents the diameter of the illumination unit 122. Symbol α represents the displacement amount between the imaging unit 11 and the illumination unit 12 in the direction along the third direction D3. Symbol β represents the displacement amount between the imaging unit 11 and the illumination unit 12 in the direction along the second direction D2. With the center of the ellipse A1 being point O(0, 0), the center of the circle A2 being point P(α, β), and the contact point between the ellipse A1 and the circle A2 being point Q(x P , y P ). In FIG. 17, symbol c represents the length in the D2 direction from the upper end of the illumination lens 102 to the center of the light guide 112. Symbol d represents the length in the D2 direction from the upper end of the illumination lens 102 to the upper end of the imaging lens 101. Symbol θ is the angle formed by the first direction D1 and the surface on the tip side of the imaging lens 101.

[0055] As shown in FIG. 16, since the point Q located on the ellipse A1 is a point on the ellipse, it satisfies the following equation (1).

Equation

[0056] Also, since the point Q located on the circle A2 is also a point on the circle with its center at point P, it satisfies the following equation (2).

Equation

[0057] Furthermore, for the ellipse A1 and the circle A2 to be tangent at point Q, the tangent line of the ellipse A1 at point Q and the tangent line of the circle A2 at point Q must be the same straight line L. Therefore, the slopes of the tangent line of the ellipse A1 at point Q and the tangent line of the circle A2 at point Q are equal, and the following equation (3) holds.

Equation

[0058] As shown in FIG. 17, the sum asinθ / 2 + d of asinθ / 2 and d is equal to the sum c + β of c and β.

Equation

[0059] From the above, when the displacement amount between the imaging unit 11 and the illumination unit 12 in the direction along the third direction D3 is α or more satisfying Expressions (1) to (4), and the displacement amount between the imaging unit 11 and the illumination unit 12 in the direction along the second direction D2 is β or more satisfying Expressions (1) to (4), the imaging unit 11 can be individually attached to and detached from the distal end main body 211. In other words, when the displacement amount between the central axis of the imaging housing portion 211a and the central axis of the illumination housing portion 211c in the direction along the third direction D3 is α or more satisfying Expressions (1) to (4), and the displacement amount between the central axis of the imaging housing portion 211a and the central axis of the illumination housing portion 211c in the direction along the second direction D2 is β or more satisfying Expressions (1) to (4), the imaging unit 11 can be individually attached to and detached from the distal end main body 211. Further, according to the embodiment, since there is no wall between the imaging unit 11 and the illumination unit 12, the diameter of the distal end main body 211 is thin, and since the distal end main body 211 does not have a lid, the secular deterioration of the distal end main body 211 hardly occurs.

[0060] In the above-described embodiment, as shown in FIG. 5, an example in which the light guide 112 extends along the first direction D1 has been described, but the present invention is not limited thereto. FIG. 18 is a cross-sectional view showing the configuration inside the distal end main body. As shown in FIG. 18, the rear ends of the signal cable 111 and the light guide 112 may extend along the first direction D1 at the same position in the third direction D3.

[0061] The imaging opening 211b and the illumination opening 211d have been described as opening in the first direction D1 and the second direction D2, but they may be formed to open only in the second direction D2.

[0062] (Modification 1) FIG. 19 is a cross-sectional view showing the configuration inside the distal end body in the endoscope system according to Modification 1. As shown in FIG. 19, in the distal end body 211A, a housing portion for housing the signal cable 111, the two light guides 112Aa and the light guide 112Ab may be formed. In this way, even in a configuration having the two light guides 112Aa and the light guide 112Ab, by housing them in a communicating housing portion, the diameter of the distal end body 211A can be reduced.

[0063] (Modification 2) FIG. 20 is a cross-sectional view showing the configuration inside the distal end body in the endoscope system according to Modification 2. As shown in FIG. 20, in the distal end body 211B, a housing portion for housing the signal cable 111, the light guide 112, and the vibrator cable 114 may be formed. In this way, in the distal end body, a housing portion for housing the distal ends of three or more built-in objects may be formed. By housing the distal ends of more built-in objects in the housing portion, the wall between the built-in objects becomes unnecessary, and the diameter of the distal end body can be reduced.

[0064] Further effects and modifications can be easily derived by those skilled in the art. Therefore, a broader aspect of the present invention is not limited to the specific details and representative embodiments represented and described as above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Description of Reference Numerals

[0065] 1 Endoscope system 2 Ultrasonic endoscope 3 Ultrasonic observation device 4 Endoscope observation device 5 Display device 6 Light source device 7 Ultrasonic vibrator 11 Imaging unit 12 Lighting unit 21 Insertion portion 22 Operation portion 23 Universal cord 24 Connectors 31 Ultrasonic Cable 41 Video Cable 61 Optical Fiber Cable 101 Imaging Lens 102 Illumination Lens 103 Treatment Instrument Outlet 104 Treatment Instrument Lifting Platform 105 Air and Water Supply Port 106 Balloon Water Supply Port 107 Balloon Suction Port 111 Signal Cable 112, 112Aa, 112Ab Light Guide 113 Channel Tube 114 Vibrator Cable 115 Air and Water Supply Tube 116 Balloon Water Supply Tube 117 Balloon Suction Tube 118 Treatment Instrument Lifting Tube 119 Treatment Instrument Lifting Wire 121 Imaging Unit 122 Illumination Unit 211, 211A, 211B Tip Body 211a Imaging Accommodation Part 211b Imaging Opening 211c Illumination Accommodation Part 211d Illumination Opening 211e Treatment Instrument Insertion Pipeline 211f Vibrator Cable Insertion Pipeline 211g Air and Water Supply Pipeline 211h Balloon Water Supply Pipeline 211i Balloon Suction Pipeline 211j Treatment Instrument Lifting Pipeline 212 Curved Tube 213 Insertion Tube 221 Curving Knob 222 Operating Member 223 Treatment Instrument Insertion Port

Claims

1. A distal end body located at the distal end of an insertion portion to be inserted into a subject, a first built-in object and a second built-in object each having a respective distal end portion accommodated in the distal end body, comprising: the distal end body has, a first accommodation portion that extends along a first direction along the longitudinal direction of the distal end body and accommodates the distal end portion of the first built-in object; a first opening portion that communicates with the first accommodation portion, opens at least toward a second direction, and fits with the distal end portion of the first built-in object; a second accommodation portion that communicates with the first accommodation portion, extends along the first direction at a position shifted in a third direction orthogonal to the first direction and the second direction, and accommodates the distal end portion of the second built-in object; a second opening portion that communicates with the second accommodation portion, opens at least toward the second direction, and fits with the distal end portion of the second built-in object; and has, wherein the second direction is a direction orthogonal to the first direction, an endoscope.

2. The endoscope according to claim 1, wherein the first built-in object is an imaging unit that images a subject by converting light received from the outside on the distal end side into an image signal.

3. The endoscope according to claim 1, wherein the second built-in object is an illumination unit that irradiates illumination light toward the outside on the distal end side.

4. The first opening portion is, formed on the distal end side of the second opening portion, and is spaced apart from the second opening portion, the endoscope according to claim 1.

5. The endoscope according to claim 1, wherein the rear ends of the first built-in object and the second built-in object extend along the first direction at the same position in the third direction.

6. comprising a treatment instrument lifting table for lifting a treatment instrument toward the second direction, wherein the distal end body extends along the first direction and has a treatment instrument insertion conduit through which the treatment instrument is inserted, the endoscope according to claim 1.

7. The first built-in object is an imaging unit that images a subject by converting light received from the outside on the distal end side into an image signal, the second built-in object is an illumination unit that irradiates illumination light toward the outside on the distal end side, the first opening portion is formed on the distal end side of the second opening portion and is spaced apart from the second opening portion, the endoscope according to claim 1.

8. The endoscope according to claim 7, wherein the rear ends of the first built-in object and the second built-in object extend along the first direction at the same position in the third direction.

9. comprising a treatment instrument lifting table for lifting a treatment instrument toward the second direction, The endoscope according to claim 7, wherein the distal end body extends along the first direction and has a treatment instrument insertion conduit through which a treatment instrument is inserted.

10. A distal end body located at the distal end of an insertion portion of an endoscope inserted into a subject, extending along a first direction along the longitudinal direction of the distal end body, and having a first accommodating portion for accommodating a distal end portion of a first built-in object; a first opening portion that communicates with the first accommodating portion, opens at least in a second direction, and is fitted with the distal end portion of the first built-in object; a second accommodating portion that communicates with the first accommodating portion, extends along the first direction at a position shifted in a third direction orthogonal to the first direction and the second direction, and accommodates a distal end portion of a second built-in object; a second opening portion that communicates with the second accommodating portion, opens at least in the second direction, and is fitted with the distal end portion of the second built-in object; and having a distal end body, wherein the second direction is a direction orthogonal to the first direction.

Images