JP2006255000A - Insertion part for endoscope and endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insertion part for an endoscope and an endoscope capable of efficiently removing the filth, etc. adhering to the outer surface of a plurality of observation optical systems, and specifically, capable of securing an excellent visual field for observation for an imaging means for special light which has to be received in a large quantity as much as possible, and sufficiently exhibiting the observation performance of a plurality of imaging units. <P>SOLUTION: The insertion part for the endoscope comprises an insertion part with the distal end part, a first imaging means for obtaining a first observation image, and a second imaging means for obtaining a second observation image. The insertion part also has a first objective optical system disposed in the distal end part for focusing the photography light coming into the first imaging means and a second objective optical system disposed in the distal end part for focusing the photography light coming into the second imaging means. The second objective optical system is disposed approximately at the center of the distal end part, and the first objective optical system is disposed in such a way that the first objective optical system has the optical axis on the outer peripheral side from the optical axis of the second objective optical system in the distal end part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an endoscope insertion portion that is inserted into a body cavity, and particularly to an endoscope having a plurality of observation optical systems.

  Conventionally, endoscopes are widely used in the medical field and the like. An endoscope, for example, observes an organ or the like in a body cavity by inserting an elongated insertion portion into the body cavity, and performs various treatments using a treatment instrument inserted into a treatment instrument insertion channel as necessary. Can be. A bending portion is provided at the distal end of the insertion portion, and the observation direction of the observation window at the distal end portion can be changed by operating the operation portion of the endoscope.

  In general, when an endoscope is inserted into a body cavity, body fluid, blood, dirt, etc. may adhere to the outer surface of the objective optical system and obstruct observation. A nozzle is provided. The outer surface of the objective optical system of the endoscope can ensure a clean observation field of view by, for example, jetting a cleaning liquid from an air / water supply nozzle or blowing air.

  The endoscope is used for observing the inside of a body cavity where natural light hardly enters. Therefore, in order to obtain photographing light captured from the observation window, the endoscope irradiates the body cavity with illumination light guided to a light guide or the like.

  For example, as described in Patent Document 1, an endoscope having a plurality of objective optical systems has been proposed. This endoscope has a plurality of imaging units, and is arranged at the distal end of the insertion portion so that the plurality of objective optical systems and the openings of the air / water supply nozzles are arranged on a substantially straight line.

In recent years, in addition to normal light observation that mainly irradiates body light with white light or RGB light by a frame sequential method to capture images in the body cavity that is almost the same as observation with the naked eye, a specific wavelength band has been set. By irradiating the body cavity with the image of the affected area and taking an image of the affected area, it is possible to identify a lesion site present in the affected area that is difficult to diagnose by normal light observation. For example, special light observation such as fluorescence observation There are endoscopes that can perform this.
Japanese Patent Laid-Open No. 06-154155

  Among special light observations performed in the body cavity, for example, in fluorescence observation, when a lesion site exists in the affected area, the amount of fluorescence emitted from the lesion site is very small, so fluorescence emitted from the lesion site is possible. It is necessary to receive as much light as possible. Therefore, in the objective optical system used in fluorescence observation, dirt or the like adheres to the outer surface due to the presence of mucous membranes, blood, and dirt in the optical axis direction, and the observation visual field is obstructed by folds in the body cavity, particularly in the intestine. In such a case, there is a possibility that the observation performance of, for example, a fluorescence imaging unit for special light observation cannot be sufficiently exhibited.

However, in the endoscope of Patent Document 1, there is no particular description about the arrangement of the objective optical system used for special light observation such as fluorescence observation, and there is a problem in accordance with the contents as described above.
In addition, a plurality of objective optical systems corresponding respectively to normal light and special light can be reliably cleaned with a cleaning liquid or air by an air / water supply nozzle even if mucous membrane, blood, filth, etc. in a body cavity adhere to each outer surface. It is desirable to be done.

  Therefore, the present invention has been made in view of the above circumstances, and it is possible to efficiently remove dirt and the like adhering to the outer surface of a plurality of observation optical systems, and in particular, it is necessary to receive light as much as possible. An object of the present invention is to provide an endoscope insertion section and an endoscope that can secure a good observation visual field for an imaging means for special light and that can sufficiently exhibit the observation performance of each imaging unit.

  In order to achieve the above object, an endoscope insertion portion and an endoscope according to the present invention include an insertion portion having a distal end portion, a first imaging means for obtaining a first observation image, and a second observation. An endoscope insertion portion having a second imaging means for obtaining an image, the first objective for condensing photographing light disposed at the distal end portion and incident on the first imaging means An optical system, and a second objective optical system that collects photographing light incident on the second imaging means, the first objective optical system, and the second objective optical system. In the objective optical system, the second objective optical system is disposed substantially at the center of the tip portion, and the first objective optical system is on the outer peripheral side of the tip portion with respect to the optical axis of the second objective optical system. Are arranged so as to have an optical axis.

  According to the endoscope of the present invention, it is possible to efficiently remove dirt and the like adhering to the outer surfaces of a plurality of observation optical systems, and particularly to an imaging unit for special light that needs to receive light as much as possible. It is possible to realize an endoscope insertion portion and an endoscope that can ensure a good observation field of view and sufficiently exhibit the observation performance of each imaging unit.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings.
First, the configuration of the endoscope system according to the present embodiment will be described with reference to FIG. FIG. 1 is an explanatory diagram schematically showing the configuration of an endoscope system according to the first embodiment of the present invention.

  As shown in FIG. 1, an endoscope system 1 according to the present invention includes an endoscope 2 that can perform normal light observation and fluorescence observation, and a light source device 3 that supplies illumination light to the endoscope 2 in the present embodiment. And a processor 4 as a signal processing device for performing signal processing on the endoscope 2 and a video signal output from the processor 4, whereby each endoscope image for normal observation or fluorescence observation is displayed. The monitor 5 to display, the air / water supply apparatus 6 which performs air / water supply, and the front water supply apparatus 6a which performs forward water supply are provided.

The endoscope 2 includes an elongated endoscope insertion portion (hereinafter simply referred to as an insertion portion) 11 so as to be easily inserted into a body cavity, an operation portion 12 connected to a proximal end of the insertion portion 11, And a universal cable 13 extending from the side of the operation unit 12. A connector 14 provided at the end of the universal cable 13 is detachably connected to the light source device 3.
Further, the insertion portion 11 of the endoscope 2 is operated from the hard distal end portion 15 formed at the distal end thereof, the bending portion 16 formed at the proximal end of the distal end portion 15, and the proximal end of the bending portion 16. And a flexible tube portion 17 having flexibility formed up to the portion 12.

A light guide 21 that transmits illumination light is inserted into the insertion portion 11. The light guide 21 is inserted into the universal cable 13 via the operation unit 12, and the base end portion 22 is connected to a light guide connector (not shown) protruding from the connector 14.
Further, the tip portion of the light guide 21 is fixed in the tip portion 15. Note that an illumination lens 25 of an illumination unit, which will be described later, which is an illumination optical system, is disposed at the distal end portion of the distal end portion 15, and illumination light is emitted from the light guide 21 via the illumination lens 25. A tip cover 24 is provided on the tip surface of the tip portion 15.

  In the present embodiment, the light guide 21 is branched, for example, in the operation unit 12, divided into two parts in the insertion unit 11, and inserted. The front end surfaces of the light guides 21 divided into two are respectively arranged in the vicinity of the back surfaces of the two illumination lenses 25 provided on the front end cover 24.

Further, a treatment instrument channel (also referred to as a forceps channel), which is a first conduit that allows a treatment instrument such as forceps to be inserted (not shown in FIG. 1), is provided in the insertion portion 11. The distal end of the treatment instrument channel is open at the distal end surface of the distal end cover 24.
The treatment instrument channel branches near the proximal end of the insertion portion 11, and one of the treatment instrument channels is inserted to a treatment instrument insertion port (not shown) provided in the operation portion 12. The other is communicated with the suction channel through the insertion portion 11 and the universal cable 13, and its base end is connected to a suction means (not shown) via the connector 14.

  Two imaging units are disposed inside the distal end portion 15. In the present embodiment, there are a normal light observation imaging unit (hereinafter referred to as a normal light imaging unit) 31A which is a first imaging means for normal light observation, and a second imaging means for special observation. A fluorescence observation imaging unit (hereinafter referred to as a fluorescence imaging unit) 31B is incorporated.

  In the present embodiment, the second imaging means is a fluorescence observation imaging unit capable of performing fluorescence observation, which is special observation. For example, a night vision observation imaging unit, an infrared observation imaging unit, or the like may be used. It is not particularly limited for fluorescence observation.

One ends of signal cables 38a and 38b are connected to the normal light imaging unit 31A and the fluorescence imaging unit 31B, respectively. The other ends of the signal cables 38 a and 38 b are inserted into the operation unit 12 and the universal cable 13, and are connected to a common signal cable 43 in a switchable manner on a relay board 42 provided in the connector 14.
The common signal cable 43 is connected to the processor 4 through the scope cable 44 connected to the connector 14.

In the processor 4, drive circuits 45a and 45b for driving the image pickup devices of the normal light image pickup unit 31A and the fluorescence image pickup unit 31B, respectively, and image pickup signals output from the two image pickup devices via the relay substrate 42, respectively. A signal processing circuit 46 that performs signal processing and a control circuit 47 that controls the operation state of the signal processing circuit 46 and the like are provided.
The operation unit 12 of the endoscope 2 includes control switches 48a and 48b, an air / water supply button 63, a bending operation knob (not shown), and a switch (not shown) for performing a tele / zoom operation of the normal light imaging unit 31A. (Also referred to as a tele / zoom button), a forward water supply button (not shown), and the treatment instrument insertion port (not shown).
These control switches 48a and 48b are connected to the control circuit 47 of the processor 4 via signal lines 49a and 49b, respectively. In the present embodiment, for example, the control switch 48a generates a signal instructing switching, and the control switch 48b generates, for example, a freeze instruction signal.

  In the relay board 42, for example, in response to an operation of the control switch 48a, one of the signal cables 38a and 38b connected to each image sensor is connected to the common signal cable 43, and the other signal cable is connected. A switching operation is performed so as to be connected to the signal cable 43.

Specifically, for example, when the control switch 48 a is operated, it is inserted into the scope cable 44 and switched to the relay board 42 via a switching signal line 49 c electrically connected to the control circuit 47. A signal is output. In the relay board 42 to which the switching signal line 49c is connected, the input terminal of the signal from the control circuit 47 is normally in the H (HIGH) level state, and the switching control terminal is pulled up. The signal cable 38a of the normal optical imaging unit 31A is connected to the common signal cable 43. Even in the start-up state, the switching control terminal is set to the H level. That is, the normal light observation state is set when the switching instruction operation is not performed.
In this state, when the user operates the control switch 48a, a control signal that causes the signal from the control circuit 47 to be L (LOW) level is applied to the input terminal of the relay board 42 via the switching signal line 49c. The terminal is pulled down, and in this state, the signal cable 38b of the fluorescence imaging unit 31B is connected to the common signal cable 43.

  Further, when the control switch 48a is operated, an H level signal is supplied to the switching control terminal, and the signal cable 38a of the normal optical imaging unit 31A is connected to the common signal cable 43.

As the control switch 48a is operated, the control circuit 47 also sends a control signal to the control circuit 58 in the light source device 3 via the control signal line 49d in the scope cable 44, and the control circuit 58 controls the control circuit 58. Control is made to generate normal observation light or excitation light for fluorescence observation according to the signal. Furthermore, the control circuit 47 controls the operation state of the signal processing circuit 46 so as to perform the operation corresponding to each imaging element of the normal light imaging unit 31A and the fluorescence imaging unit 31B.
The light source device 3 is arranged in the optical path of the lamp 51 that generates white light including the wavelength of the excitation light, the collimator lens 52 that converts the light from the lamp 51 into a parallel light beam, and is, for example, visible light A rotary filter 53 provided with an RGB filter in the circumferential direction that passes light in the wavelength bands of R (RED), G (GREEN), and B (BULUE) in the wavelength band (380 nm to 780 nm), and transmitted light of the rotary filter 53 And a condensing lens 54 that collects the light and emits the light to the base end portion 22 of the light guide 21.

Further, the rotary filter 53 provided with the RGB filter is provided with a filter for excitation light that passes excitation light in a wavelength band shorter than the wavelength band of visible light on the outer side in the circumferential direction. The rotary filter 53 is rotationally driven by a motor 55. Further, the motor 55 is attached to a rack 56, and can be moved in a direction perpendicular to the illumination optical axis as indicated by an arrow by a geared motor 57 meshing with the rack 56.
The geared motor 57 is controlled by a control circuit 58. The control circuit 58 is connected to the control circuit 47 of the processor 4 through the control signal line 49d, and performs a corresponding control operation by operating the control switch 48a.
Further, at the distal end portion 15, the jet outlet faces the outer surface of each objective lens (hereinafter also referred to as an observation lens) of the normal light imaging unit 31 </ b> A and the fluorescence imaging unit 31 </ b> B disposed on the distal end cover 24. Thus, an air / water supply nozzle 60 which is an air / water supply means is arranged.
As will be described later, the air / water supply nozzle 60 is connected to an air / water supply pipe 61 that is joined together at the tip side, and the proximal end side of the air / water supply pipe 61 is connected to the air / air supply line 61a. It branches to the water supply pipeline 61b.
The air supply pipe 61a and the water supply pipe 61b communicating with the air / water supply nozzle 60 are inserted to the connector 14 of the universal cable 13 and are connected to the air / water supply apparatus 6 including a pump (not shown) for supplying and supplying air. Is done.

  The air supply pipe 61a and the water supply pipe 61b are provided with the above-described air supply / water supply button 63 in the operation section 12 in the middle of the operation. Water is delivered.

  As a result, the air / water supply nozzle 60 sprays a gas such as air or a liquid such as distilled water on the outer surfaces of the objective lenses of the normal light imaging unit 31A and the fluorescence imaging unit 31B arranged in the ejection direction, Kimonos and the like are removed and washed to ensure a clean imaging and observation field of view.

Furthermore, in the insertion portion 11, a forward water supply channel (not shown in FIG. 1) that is a second conduit for supplying a liquid such as distilled water to a test site in the body cavity is provided. The front end of the front water supply channel is open at the front end surface of the front end cover 24.
This forward water supply channel is connected to the forward water supply device 6a, and a front water supply button (not shown) disposed in the operation unit 12 is interposed. When this forward water supply button is operated, a liquid such as distilled water is sprayed from the distal end surface of the insertion portion 11 toward the insertion direction into the body cavity. Thereby, the body fluid adhering to the test site in the body cavity can be washed. As shown in FIG. 1, a foot switch 6b is connected to a cable extending from the forward water supply device 6a, and the user can insert the foot switch 6b into the body cavity from the distal end surface of the insertion portion 11 by operating the foot switch 6b. A liquid such as distilled water can be sprayed in the direction.

As shown in FIGS. 2 to 4, the distal end cover 24 disposed at the distal end portion 15 of the insertion portion 11 includes an observation lens 31 a that is a first observation window of the normal light imaging unit 31 </ b> A, and a fluorescence imaging unit 31 </ b> B. An observation lens 31b that is the second observation window, two illumination lenses 25a and 25b that are illumination windows, an opening 26 of the treatment instrument channel, and an opening 27 of the front water supply channel are disposed. . Further, as described above, the air supply / water supply nozzle 60 is disposed in the distal end cover 24 so that the jet outlet 60a faces the observation lenses 31a and 31b.
2 and 3 are perspective views showing the distal end cover portion of the endoscope, and FIG. 4 is a plan view of the distal end cover as viewed from the front. The two observation lenses 31a and 31b are optical members.

Specifically, when the distal end portion 15 is viewed from the distal end, an observation lens 31b is disposed substantially at the distal end surface of the substantially circular distal end cover 24, and the observation lens 31b is sandwiched between the observation lens 31b in FIG. An illumination lens 25a and an illumination lens 25b are arranged on the left and right as viewed toward the paper surface. Further, on the front end surface of the front end cover 24, toward the paper surface of FIG. 4, the opening 27 of the front water channel on the upper right side of the observation lens 31 b, the air / water supply nozzle 60 on the upper left side, the observation lens 31 a on the lower right side, and An opening 26 of the air / water supply channel is disposed on the lower left side.
Note that the arrangement of the observation lenses 31a and 31b, the openings 26 and 27, and the air / water supply nozzle 60 disposed on the tip cover 24 in the present embodiment will be described in detail later.

  Next, the internal configuration of the distal end portion of the insertion portion 11 of the endoscope 2 according to the present embodiment will be described based on FIGS. 5 is a sectional view of the distal end portion and the curved portion cut along the line AA in FIG. 4, FIG. 6 is a sectional view of the distal end portion cut along the line BB in FIG. Is a cross-sectional view showing a branched portion of the air / water supply conduit, FIG. 8 is a partial cross-sectional view of the tip section cut along the line CC in FIG. 4, and FIG. 9 is cut along the line DD in FIG. It is a fragmentary sectional view of the tip part.

  As shown in FIG. 5, a plurality of annular bending pieces 7 are rotatably connected to the bending portion 16 of the endoscope 2. Each bending piece 7 has four wire guards 7a fixed to the inner peripheral surface thereof by means such as welding. The four wire guards 7a are fixed to the inner peripheral surface of one bending piece 7 at positions shifted by approximately 90 ° around the insertion axis.

  Further, the plurality of bending pieces 7 are covered with a bending blade 9 in which a thin wire or the like is knitted in a cylindrical shape so as to cover the outer periphery thereof, and an outer skin 10 is provided on the bending blade 9 so as to keep water tightness. The bending portion 16 is formed by being covered.

  The outer skin 10 is coated so as to be integrated over the entire length of the insertion portion 11 including the distal end portion 15, the bending portion 16, and the flexible tube portion 17. It is fixed by the part 10a.

  Further, four bending operation wires 8 that are bending operation means extending from the bending portion 16 toward the proximal end are inserted into the insertion portion 11. These four bending operation wires 8 are respectively inserted into the insertion shafts by four fixing portions 18a (only one is shown in FIG. 5) of the fixing ring 18 provided in the tip portion 15. It is shifted and held around 90 ° around and is fixed so that the proximal end portion is inserted through each wire guard 7 a provided on the bending piece 7.

  In a state where the insertion axis of the bending portion 16 is substantially straight, it is held and fixed by each fixing portion 18a of the fixing ring 18 provided at the distal end portion 15, and is inserted into each wire guard 7a of each bending piece 7. The distal end portion 15 and each bending piece 7 are connected so that each bending operation wire 8 is substantially straight.

  Further, these bending operation wires 8 are provided in the operation section 12 (see FIG. 1) at the base end, and are connected to a bending operation mechanism (not shown) connected to the bending operation knob to be alternately pulled or relaxed. It is like that.

  The four bending operation wires 8 are pulled and loosened by predetermined operations of the bending operation knob, respectively, so that the bending portion 16 is bent in four directions. As will be described later, these four directions are four directions, up, down, left, and right of the endoscopic image displayed on the monitor 5 photographed by each of the imaging units 31A and 31B.

  Further, two bending operation wires 8 that are first bending operation means for operating the bending portion 16 in the up-down direction and two bending operation means that operate the bending portion 16 in the left-right direction. The bending operation wire 8 is paired with each other. That is, the two bending operation wires 8 respectively inserted and held in the two wire guards 7a in the direction corresponding to the vertical direction of the bending piece 7 in the bending portion 16 are the first bending operation means, and the bending portion 16 The two bending operation wires 8 respectively inserted and held in the two wire guards 7a in the direction corresponding to the left-right direction of the bending piece 7 are the second bending operation means.

  A cylindrical member 15a made of a hard metal and formed with a plurality of, seven holes in the present embodiment, and an annular shape that externally fits the outer peripheral portion on the proximal end side of the cylindrical member 15a. The reinforcing ring 15b is provided. In addition, the fixed ring 18 having the four fixed portions 18 a described above is inserted into the inner peripheral side of the reinforcing ring 15 b of the distal end portion 15. Further, the reinforcing ring 15b is connected to the bending piece 7 having the most proximal end portion.

  Of the seven holes formed in the columnar member 15a in the distal end portion 15, two hole portions form the distal end portions of the treatment instrument channel 19 and the front water supply channel 20, and the remaining five hole portions include the above-described portions. The normal light imaging unit 31A, the fluorescence imaging unit 31B, the air / water feeding nozzle 60, and two illumination lens units to be described later are arranged.

The treatment instrument channel 19 includes a substantially cylindrical tube member that is fitted into an opening 26 opened in a distal end cover 24 provided on the distal end surface of the distal end portion 15 and a hole of a columnar member 15a of the distal end portion 15. 19 a and a treatment instrument pipe line 19 b made of a flexible tube whose distal end portion covers the proximal end portion of the tube member 19 a and is connected and fixed by thread winding.
This treatment instrument pipe line 19b is inserted through the insertion portion 11, and its proximal end is opened at the operation portion 12 at the treatment instrument insertion port (not shown in FIG. 1) as described above.

Similarly, the front water supply channel 20 having the opening 27 in the distal end cover 24 includes a substantially cylindrical tube member 20a inserted into a hole of the columnar member 15a of the distal end portion 15, and a proximal end portion of the tube member 20a. It has a front water supply pipe 20b that is covered and fixed with a front end connected by thread winding.
This forward water supply conduit 20b is inserted through the insertion portion 11, the operation portion 12 and the universal cable 13 to the connector 14 and is connected to the forward water supply device 6a. As described above, the front water supply pipe 20b, which is the front water supply channel 20, is provided with a front water supply button (not shown) in the operation unit 12.

  As shown in FIG. 6, the air / water supply nozzle 60 is a tubular member bent into a substantially L shape, and the opening 60a on the distal end side faces the outer surface side of each observation lens 31a, 31b. The proximal end portion is inserted into the hole of the columnar member 15 a of the distal end portion 15.

  The distal end portion of the pipe member 62 is inserted into the proximal end side of the hole portion of the columnar member 15 a corresponding to the air / water feeding nozzle 60, and the air / water feeding conduit 61 is inserted into the proximal end portion of the pipe member 62. It is connected. The pipe member 62 and the air / water supply conduit 61 are connected and fixed by thread winding.

  As shown in FIG. 7, the air supply / water supply pipeline 61 is connected at its base end portion to the branch pipe 50, and the branch ends of the branch pipe 50 are the tip portions of the air supply pipe 61a and the water supply pipe 61b. Connected to each. As a result, the air / water supply conduit 61 communicates with the air / water supply conduit 61a and 61b. The pipes 61, 61a, 61b and the branch pipe 50 are connected and fixed by thread winding, and an adhesive or the like is applied around each connection part and the entire branch pipe 50 so that each connection part is airtight. (Watertight) retained.

  Of the seven holes formed in the cylindrical member 15a of the distal end portion 15, the illumination lens unit 23 is respectively inserted into the two holes from the distal end side, and the distal end portion of the light guide 21 is located at the proximal end portion. It is inserted. As shown in FIGS. 8 and 9, the illumination lens unit 23 includes a plurality of illumination lenses 25 and a holding frame 23 a that holds the illumination lenses 25. Note that the two illumination lens units 23 in the present embodiment have illumination lenses 25 a and 25 b that are the forefront of each illumination lens 25.

  The light guide 21 is covered with a cylindrical member 21a at the tip and covered with an outer skin 29 that bundles a plurality of fiber fibers. The base end portion of the cylindrical member 21 a is connected and fixed to a tube 28 whose tip portion is fixed with a bobbin, and a light guide 21 covered with an outer skin 29 is inserted into the tube 28.

  Of the seven holes of the cylindrical member 15a, one hole is fixed by a first observation optical system fixing means such as a screw, a screw, or an adhesive, as will be described later. The first observation optical system arrangement means in which the normal light observation unit 31A including the observation lens 31a, which is an observation optical system, is arranged, and the other one hole is, for example, a screw, a screw, The second observation optical system arrangement means is configured such that the fluorescence observation unit 31B including the observation lens 31b as the second observation optical system is arranged by the second observation optical system fixing means such as an adhesive. The other two illumination lens units each having the respective illumination lenses 25 that are the two illumination optical systems are fixedly arranged by first and second illumination optical system fixing means such as screws and adhesives, for example. One of the holes is first An illumination optical arrangement means and the other constitutes a second illumination optical disposition means.

  Of the seven holes, the hole in which the air / water supply means is arranged is, for example, an air / water supply in which the air supply nozzle 60 is fixedly arranged by a first air / water supply fixing means such as a screw or an adhesive. It constitutes an arrangement means. Further, of the seven holes, the hole in which the treatment instrument channel 19 that is the first endoscope channel is arranged constitutes a first endoscope channel arranging means, and the second inner tube is arranged. The hole in which the front water supply channel 20 which is an endoscope channel is arranged constitutes a second endoscope channel arrangement means. The treatment instrument channel 19 is fixedly disposed in one of the seven holes by a first endoscope conduit fixing means such as a screw or an adhesive, and the front water supply channel 20 is For example, the second endoscope pipe fixing means such as a screw or an adhesive is fixedly arranged in the other one hole.

  Returning to FIG. 6, the normal light imaging unit 31 </ b> A includes a lens unit 32, an imaging device 33 such as a CCD (Charge Coupled Device), a CMOS (Complementary Metal-Oxide Semiconductor), and a circuit board 34.

  The lens unit 32 includes first to fourth lens groups 32A to 32D and first to fourth lens frames 32a to 32d. In the present embodiment, the first lens group 32A including four objective lenses including the observation lens 31a is held by the first lens frame 32a, and the second lens 32B including one objective lens is the second lens frame. A third lens group 32C composed of two objective lenses is held on the third lens frame 32c, and a fourth lens group 32D composed of three objective lenses is held on the fourth lens frame 32d.

  The second lens frame 32b that holds the second lens 32B is a movable frame that can advance and retreat with respect to the photographing optical axis direction for zooming. The second lens frame 32b is provided with a driving means such as a motor or an actuator (not shown) provided in the normal optical imaging unit 31A when a zooming operation lever (not shown) provided in the operation unit 12 is operated by the user. Thus, the forward / backward movement with respect to the photographing optical axis direction is performed.

  The driving means for moving the second lens frame 32b forward and backward with respect to the photographing optical axis direction is supplied with a driving / stop signal by a signal line (not shown). This signal line is inserted from the normal optical imaging unit 31 </ b> A through the insertion unit 11 to the operation unit 12.

  The image pickup device 33 is provided with a cover lens 33a arranged in parallel with the base end side of the objective lens at the most base end of the fourth lens frame 32d on the light receiving surface side, and outputs an electric signal corresponding to the optical image to the circuit board 34. To do. The circuit board 34 has electrical components and wiring patterns, photoelectrically converts an optical image from the image sensor 33 into an electrical image signal, and outputs the image signal to a signal cable 38a. The circuit board 34 is connected to a plurality of signal lines of the signal cable 38a by means such as soldering.

  The cover lens 33a, the image sensor 33, the circuit board 34, and the tip end portion of the signal cable 38a are integrally covered with an insulating sealing resin or the like, and covered with a reinforcing annular portion 35a and an insulating tube 35b. ing.

  In addition, the signal cable 38a receives the image signal acquired by the imaging device 33 and the circuit board 34 of the normal light imaging unit 31A via the relay board 42 and the signal cable 43 of the connector 14 shown in FIG. The data is transmitted to the processing circuit 46.

  On the other hand, the fluorescence imaging unit 31B includes a lens unit 32, an imaging element 38 such as a CCD or a CMOS, and a circuit board 39, like the normal light imaging unit 31A.

  The lens unit 36 includes first and second lens groups 36A and 36B, and first and second lens frames 32a and 32b. In the present embodiment, the first lens group 36A composed of seven objective lenses including the observation lens 31b is held by the first lens frame 36a, and the second lens 36B is held by the second lens frame 36b. .

  The image pickup element 38 is provided with a cover lens 40 arranged in parallel on the base end side of the objective lens at the most base end of the second lens frame 36 b on the light receiving surface side, and outputs an electrical signal of an optical image to the circuit board 39. . This circuit board 39 has electrical components and wiring patterns as in the circuit board 34 of the normal optical imaging unit 31A, and a plurality of signal lines of the signal cable 38a are connected by means such as soldering, and the imaging element 38 The optical image is photoelectrically converted into an electrical image signal, and the image signal is output to the signal cable 38b.

  The cover lens 40, the image sensor 33, the circuit board 34, and the tip end portion of the signal cable 38a are each covered with an insulating sealing resin or the like, and covered with a reinforcing annular portion 37a and an insulating tube 37b. ing.

  In addition, the signal cable 38b performs signal processing of the processor 4 on the image signal acquired by the imaging element 38 and the circuit board 39 of the fluorescence imaging unit 31B via the relay board 42 and the signal cable 43 of the connector 14 shown in FIG. Transmit to circuit 46.

  The normal light imaging unit 31A and the fluorescence imaging unit 31B described above are respectively inserted into predetermined holes provided in the columnar member 15a of the distal end portion 15, and are fixing members that are observation optical system fixing means such as screws. It is firmly fixed together with 41a and 41b by an adhesive or the like.

  More specifically, as shown in FIG. 6, the normal light imaging unit 31A has a cylindrical member 15a and an outer peripheral portion of the third lens frame 32c of the objective lens unit 32 by a fixing member 41a which is a first observation optical system fixing means. It is fixed. On the other hand, in the fluorescence observation unit 31B, the outer peripheral portions of the cylindrical member 15a and the first lens frame 36a of the objective lens unit 36 are fixed by a fixing member 41b which is a second observation optical system fixing means.

  Note that the fixing members 41 a and 41 b that fix the imaging units 31 A and 31 B to the columnar member 15 a of the distal end portion 15 are shifted by a predetermined distance in the axial direction of the insertion portion 11. That is, the fixing members 41a and 41b are respectively located at positions where the third lens frame 32c of the normal light imaging unit 31A and the first lens frame 36a of the fluorescence imaging unit 31B are displaced in the insertion axis direction of the columnar member 15a of the tip portion 15. It is fixed. Thereby, since the fixing members 41a and 41b do not become a position which overlaps with an insertion-axis direction, the device which makes the front-end | tip part 15 into a small diameter is made.

  Further, in the present embodiment, the normal light imaging unit 31A includes a part of the third lens frame 32c (the maximum outer diameter part) except for the driving unit that moves the second lens frame 32b forward and backward in the optical axis direction. ) In the outer diameter direction (direction substantially orthogonal to the major axis) is the largest portion. On the other hand, the fluorescence observation unit 31B is a portion having the largest diameter in the outer diameter direction of a part (maximum outer diameter portion) of the first lens frame 36a.

  As can be seen from FIG. 6, the maximum outer diameter portion of the third lens frame 32c of the normal light imaging unit 31A and the maximum outer diameter portion of the first lens frame 36a of the fluorescence imaging unit 31B are the insertion axes of the insertion portion 11. The imaging units 31A and 31B are disposed on the columnar member 15a of the tip 15 so as not to overlap each other, that is, in a position shifted in the direction. Such an arrangement of the imaging units 31A and 31B is devised so that the distal end portion 15 has a small diameter.

  Further, in the present embodiment, the observation lens 31a that the normal light imaging unit 31A has at the tip thereof has a lens diameter (diameter) of the observation lens 31b that is arranged at the tip of the fluorescence imaging unit 31B. Has a larger diameter.

  Further, in each of the image pickup units 31A and 31B, the light receiving surfaces of the two image pickup devices 33 and 38 are orthogonal to the insertion axis of the insertion portion 11, and the horizontal transfer direction and the vertical transfer direction of the two image pickup devices 33 and 38 are set. Are set in the distal end portion 15 so as to match each other.

  The subject images photographed by the respective imaging units 31A and 31B are displayed on the monitor 5 (see FIG. 1). The vertical direction of the monitor 5 is the vertical transfer direction of the CCD elements or CMOS elements of the respective imaging elements 33 and 38. The left and right directions coincide with the horizontal transfer direction of the CCD elements or CMOS elements of the image pickup elements 33 and 38. That is, the up / down / left / right directions of the endoscopic images taken by the imaging units 31 </ b> A and 31 </ b> B coincide with the up / down / left / right directions of the monitor 5.

The vertical and horizontal directions of the bending portion 16 of the insertion portion 11 are determined so as to correspond to the vertical and horizontal directions of the endoscopic image displayed on the monitor 5. That is, the four bending operation wires 8 inserted into the bending portion 16 are pulled and loosened by a predetermined operation of the bending operation knob provided in the operation portion 12 as described above, and the bending portion 16 is displayed on the monitor 5. It can be bent in four directions, up, down, left, and right, corresponding to the up, down, left, and right directions of the image.
That is, even if the observation with the normal light and the observation of the fluorescence are switched, the imaging units 31A, 31A, 31B, and 31B are arranged so that the endoscopic image displayed on the monitor 5 is always equal in the vertical and horizontal directions of the bending operation direction of the bending portion 16. In 31B, the installation direction in the distal end portion 15 is determined so that the horizontal transfer direction and the vertical transfer direction of the respective image sensors 33 and 38 coincide with each other.

  As a result, the bending portion 16 can be obtained without the user receiving an uncomfortable feeling in the vertical and horizontal directions of the endoscopic image displayed on the monitor 5 when the endoscopic image is switched between the observation image with normal light and the observation image with fluorescence. Can be bent in the vertical and horizontal directions.

  In the description to be described later, the up and down direction, which is the first direction, will be described as the up and down direction of the endoscopic image displayed on the monitor 5 and the up and down direction in which the bending portion 16 is bent. Further, in general, the monitor 5 is installed so that the vertical direction thereof substantially coincides with the vertical vertical direction. Furthermore, the left-right direction, which is the second direction substantially orthogonal to the up-down direction, is equal to the left-right direction of the endoscopic image displayed on the monitor 5 and the left-right direction in which the bending portion 16 is bent.

Here, the operation of the endoscope system 1 described above will be described.
As shown in FIG. 1, the user connects the connector 14 of the endoscope 2 to the light source device 3, connects one end of the scope cable 44 to the connector 14, and connects the other end of the scope cable 44 to the processor 4. Connect to. Further, the air supply pipe 61 a and the water supply pipe 61 b are connected to the air supply / water supply device 6.
And a user turns ON power switches, such as the light source device 3, and sets each to an operating state. At this time, the control circuits 47 and 58 of the processor 4 and the light source device 3 are in a state in which control signals and the like can be transmitted and received.
In the activated state, the relay board 42 is set so that the normal optical imaging unit 31A side is selected. The control circuit 47 performs a control operation for setting the normal light observation state. That is, the control circuit 47 sends a control signal to the control circuit 58 of the light source device 3 to set the illumination light supply state for normal light observation.

Further, the control circuit 47 controls the drive circuit 45a to be driven and sets the operation state of the signal processing circuit 46 to the normal light observation mode.
The user inserts the insertion portion 11 of the endoscope 2 into the body cavity and sets so that the affected part or the like to be diagnosed can be observed.
As described above, the light source device 3 is in a state of supplying illumination light for normal light observation. In this state, the rotary filter 53 is rotationally driven by the motor 55 in a state where the RGB filter is disposed in the illumination optical path. The light guide 21 is supplied with RGB illumination light in the order of frames. In synchronization with this, the drive circuit 45a outputs a drive signal, and illuminates the affected area in the body cavity of the patient via the illumination lenses 25a and 25b.

An illuminated subject such as an affected part passes through the lens unit 32 of the normal light imaging unit 31A, forms an image on the light receiving surface of the imaging element 33, and is subjected to photoelectric conversion. The image sensor 33 outputs a photoelectrically converted signal by applying a drive signal. This signal is input to the signal processing circuit 46 through the common signal cable 43 selected by the signal cable 38a and the relay board 42.
The signal input into the signal processing circuit 46 is A / D converted internally and then temporarily stored in the R, G, B memory.
Thereafter, the signals stored in the R, G, B memory are simultaneously read and synchronized into R, G, B signals, and further D / A converted into analog R, G, B signals, The color is displayed on the monitor 5.

The user turns on the control switch 48a when he wants to examine the affected part in more detail by fluorescent observation in addition to normal light observation. Then, the control circuit 47 receives this switching instruction signal, performs switching control of the relay substrate 42, and sets the light source device 3 to a supply state of excitation light for fluorescence observation via the control circuit 58.
The control circuit 47 controls the drive circuit 45b to the operating state and sets the signal processing circuit 46 to the fluorescence observation processing mode.
In this case, the control circuit 58 in the light source device 3 moves the rotary filter 53 in the direction orthogonal to the illumination optical path together with the motor 55 by the geared motor 57, and the excitation light filter is arranged in the illumination optical path. Like that.
In this state, the light from the lamp 51 is supplied to the light guide 21 through the light in the wavelength band near 400 to 450 nm, for example, by the excitation light filter. And this excitation light is irradiated to the affected part etc. in a body cavity through illumination lens 25a, 25b.

The affected part irradiated with the excitation light absorbs the excitation light when it is a cancer tissue, and emits stronger fluorescence than the normal tissue. The light of the part that emits fluorescence passes through the lens unit 36 of the fluorescence imaging unit 31B, forms an image on the light receiving surface of the imaging element 38, and is photoelectrically converted.
The image sensor 38 outputs a photoelectrically converted signal by applying a drive signal from the drive circuit 45b. In this case, the signal is amplified inside the image sensor 38 and output from the image sensor 38. This signal is input to the signal processing circuit 46 through the common signal cable 43 selected by the signal cable 38b and the relay board 42.
The signal input into the signal processing circuit 46 is A / D converted internally and then stored in, for example, the R, G, B memory simultaneously.

Thereafter, the signals stored in the R, G, B memory are simultaneously read and synchronized into R, G, B signals, and further D / A converted into analog R, G, B signals, The monitor 5 is displayed in monochrome.
Note that the level of the signal input into the signal processing circuit 46 may be compared with a plurality of threshold values, and the color to be assigned may be changed in accordance with the comparison result to display a pseudo color.
As described above, according to the present embodiment, since normal light observation and fluorescence observation can be performed, it is possible to realize an endoscope that can be more easily diagnosed than an endoscope that performs only normal light observation. Moreover, according to the present Example, since each imaging unit 31A, 31B is provided, a favorable normal light observation image and a fluorescence observation image are obtained.

Specifically, particularly when performing fluorescence imaging, it is necessary to capture weak light as compared with the case of normal observation, and it is desirable to have a high S / N. In this embodiment, an image having a low S / N is likely to be obtained. However, in the present embodiment, since the image pickup element 38 having high sensitivity to light is used for the image pickup element 33 for normal observation suitable for fluorescence imaging, the S A fluorescent image with good / N can be obtained.
In addition, by providing a switching relay board 42 so that only one of the two imaging units 31A and 31B is connected to the processor 4, the two imaging units 31A and 31B are always driven and The endoscope system 1 having a compact configuration can be formed as compared with the case where signal processing has to be performed.
Further, according to the present embodiment, it is possible to ensure a good observation field of view by setting a clean state by blowing gas and liquid on the outer surfaces of both observation lenses 31a and 31b with one air / water supply nozzle 60. Therefore, the diameter of the insertion portion 11 can be reduced, the pain given to the patient at the time of insertion can be reduced, and the applicable range of insertion can be expanded.

  In addition, the endoscope 2 of the present embodiment has the same external structure as an existing endoscope that includes only an imaging unit for normal light observation, and imaging for normal light observation via a scope cable 44. By connecting to an unillustrated processor that performs driving and signal processing for an existing endoscope having only a unit, it can also be used as an endoscope for normal light observation in the same manner as an existing endoscope. That is, the endoscope 2 can be used by being connected to an existing processor while maintaining the same compatibility as an existing endoscope having only an imaging unit for normal light observation.

  Here, the endoscope 2 of the present embodiment has various features (effects) due to the structure described below.

First, with reference to FIG. 10, the arrangement of the air / water supply nozzle 60 and the observation lenses 31a and 31b arranged in the tip cover 24 will be described in detail.
FIG. 10 is a front view showing the distal end surface of the distal end cover. In the following description, the center of the tip cover 24 is O ₀ , the center of the observation lens 31 a of the normal light imaging unit 31 A is O _1, and the center of the observation lens 31 b of the fluorescence imaging unit 31 B is O ₂ . Further, the centers of two illumination lenses 25a and 25b, which will be described later, are O ₃ and O ₄ , respectively, the center of the opening 26 of the treatment instrument channel 19 is O _5, and the center of the opening 27 of the front water supply channel 20 is O _{5. 6} . Further, the vertical line X of the curved portion 16 passing through the center O ₀ of the distal end surface of the distal end cover 24 is defined as a vertical line X, and the horizontal line Y is defined as a curved horizontal line. In the following description, the vertical line X in the present embodiment is a line equal to the vertical line.

  As described above, the air / water supply nozzle 60 is formed on the front end surface of the front end cover 24 as viewed from the paper surface of FIG. 10 so that the jet port 60a faces the observation lenses 31a and 31b of the fluorescence imaging unit 31B. It is arranged on the upper left side. The air / water supply nozzle 60 may be disposed on the upper right side of the front end surface of the front end cover 24 as viewed toward the paper surface of FIG. 10 so that the jet outlet 60a faces the observation lenses 31a and 31b. Good. At this time, the air / water supply nozzle 60 and the observation lenses 31a and 31b are arranged on the front end surface of the front end cover 24 so as to be aligned on a substantially straight line.

  In the present embodiment, the air / water supply nozzle 60 is disposed on the tip cover 24 so that gas / liquid such as distilled water or air ejected from the outlet 60a of the air / water supply nozzle 60 is ejected in the direction of the arrow line AR in the figure. It is disposed on the tip surface. The air / water supply nozzle 60 is jetted into the gas / liquid jet range A so that gas / liquid such as distilled water or air spreads from the jet outlet 60a. The arrow line AR is a line that is substantially perpendicular to the tip surface of the air / water supply nozzle 60 having the jet outlet 60a and passes through the center of the hole surface of the jet outlet 60a.

Described above, so as to intersect with the observation optical axis passing through the center O ₂ of the observation lens 31b on a line of arrows AR, installation direction about the axis of the air and water supply nozzle 60, i.e., the direction is determined to face the ejection port 60a ing. In other words, the jet outlet 60a of the air / water feed nozzle 60 is arranged such that the arrow line AR, which is the jet direction of gas-liquid such as distilled water or air, has a predetermined angle θ1 that is a first angle with respect to the vertical line X. The direction to face is decided.

On the other hand, the observation lens 31a of the normal optical imaging unit 31A has a distal end facing the paper surface of FIG. 10 so that the outer surface has at least a portion that intersects the arrow line AR when the distal end cover 24 is viewed from the distal end. The cover 24 is disposed on the lower right side of the front end surface. Also, the observation lens 31a has its center O ₁ is disposed on the distal end surface of the distal end cover 24 so as to be positioned on the lower side than the line of arrow line AR.

As described above, the air / water feeding nozzle 60 and the two observation lenses 31 a and 31 b are arranged in a substantially straight line on the distal end surface of the distal end cover 24.
In detail, a line a connecting the center _{O 2} of the observation lens 31b of the center _{O 1} and the fluorescence imaging unit 31B of the observation lens 31a of the normal light image pickup unit 31A has a predetermined angle θ2 with respect to the arrow line AR The tip cover 24 is slightly displaced downward when viewed from the tip surface side. In other words, a line b connecting the centers O ₁ of Anamen center the observation lens 31a of the spout 60a of the air and water supply nozzle 60, the end cover slightly with a predetermined angle θ3 with respect to the arrow line AR 24 Is shifted upward when viewed from the front end surface side.

Thereby, each position where each observation lens 31a, 31b is arrange | positioned at the front-end | tip cover 24 is determined, and the direction (arrow line AR direction) of the jet outlet 60a of the air / water supply nozzle 60 is determined according to it. Yes. Further, the angles θ2 and θ3 are set in such a range that the entire outer surface of the observation lens 31a is included in the range of the gas / liquid ejection range A from the air / water feeding nozzle 60.
The gas / liquid ejection range A of the air / water feeding nozzle 60 is set so as to include the entire outer surface of the observation lens 31b of the fluorescence imaging unit 31B when viewed from the distal end side of the distal end cover 24.
Further, as will be described later, the observation lens 31a having a lens diameter (a diameter that is an outer diameter) larger than the outer diameter of the observation lens 31b is provided on the distal end cover 24 farther from the air / water supply nozzle 60 than the observation lens 31b. It is arrange | positioned at the front end surface.

  Note that the front end cover 24 is bent in the vertical direction of the bending portion 16 with respect to the direction viewed from the front end surface side, that is, the vertical processed by the respective image pickup devices 33 and 38 included in the respective image pickup units 31A and 31B. An air / water supply nozzle 60 is provided at a position above the horizontal line Y that bisects the vertical direction of the transfer direction. In other words, the air / water supply nozzle 60 is disposed on the tip cover 24 away from the horizontal line Y in the direction opposite to the ejection direction (arrow line AR direction).

  Further, the front end cover 24 is in the left-right direction with respect to the direction seen from the front end surface side (the direction opposite to the left-right direction of the bending portion 16), that is, the respective image pickup elements included in the respective image pickup units 31A, 31B. On the vertical line X that bisects the left-right direction of the vertical transfer direction processed by 33, 38, there is a cross section in a direction perpendicular to the longitudinal axis (axis parallel to the insertion direction) of the air / water feeding nozzle 60 An air / water supply nozzle 60 is disposed so as not to cause the trouble.

  In the present embodiment, the air / water feeding nozzle 60 is located at the position of the tip surface of the tip cover 24 that is separated from the vertical line X by a predetermined distance when viewed from the tip surface side of the tip cover 24. It is arranged. That is, the air / water supply nozzle 60 has a longitudinal axis that is above the horizontal line Y that bisects the tip cover 24 in the vertical direction when viewed from the tip surface side of the tip cover 24 and the tip cover 24. Are arranged so as to exist at a position shifted to the left side from the vertical line X that bisects the left and right.

  As a result, the endoscope 2 according to the present embodiment substantially includes the air / water supply nozzle 60 provided on the distal end surface of the distal end cover 24, the observation lens 31a of the normal light imaging unit 31A, and the observation lens 31b of the fluorescence imaging unit 31B. When arranged on a straight line, the gas / liquid is sprayed on the outer surface of each of the observation lenses 31a and 31b by one air / water supply nozzle 60 to set it in a clean state so that a good observation field can be secured.

  In the present embodiment, as described above, the fluorescence observation is performed as described above, because the objective optical system adheres to the outer surface due to the presence of mucous membranes, blood, dirt, etc. in the optical axis direction. If the observation visual field is obstructed by the folds in the intestine, there is a possibility that the observation performance of the fluorescence imaging unit 31B cannot be exhibited sufficiently.

  Therefore, the observation lens 31b of the fluorescence imaging unit 31B is substantially at the center of the distal end cover 24, which is the distal end surface of the distal end portion 15 where mucous membranes, blood, dirt, etc. are difficult to adhere and the observation visual field is hardly obstructed by folds in the intestine. It is arranged.

  That is, the fluorescence imaging unit 31B including the objective lens unit 36 including the observation lens 31b is disposed in the approximate center of the distal end portion 15, and the normal light imaging unit 31A including the objective lens unit 32 including the observation lens 31a is used for the observation. The optical axis that is incident on the observation lens 31a is disposed on the outer peripheral side of the tip portion with respect to the optical axis that is incident on the lens 31b.

  Further, the longitudinal axis of the air / water feeding nozzle 60 is above the horizontal line Y that bisects the tip cover 24 in the vertical direction, and a predetermined distance from the vertical line X that bisects the tip cover 24 in the left and right directions. Because of the deviation, the air / water supply conduit 61 communicating with the air / water supply nozzle 60 has four fixing portions 18a of the fixed ring 18 disposed in the distal end portion 15 when the insertion portion 11 is in a substantially straight state. Without being in contact with the four wire guards 7 a provided on each bending piece 7 disposed in the bending portion 16, the bending piece 16 is inserted substantially straight into the distal end portion 15 and the bending portion 16.

  Further, due to the arrangement of the air / water supply nozzle 60 described above, the air / water supply / pipe 61 is inserted into the four wire guards 7 a of the bending pieces 7 in the bending portion 16 and held by the four bending operation wires 8. Therefore, the movement of the bending operation wire 8 can be prevented from being hindered by pulling and loosening, and the bending operation wire 8 can be prevented from being deteriorated by rubbing.

  As a result, the endoscope 2 of the present embodiment can reduce the diameter of the insertion portion 11, particularly the distal end portion 15 and the bending portion 16, can reduce pain given to the patient during insertion, and can be inserted into the body cavity. The scope of application can be expanded.

  In general, the endoscope 2 is used by the user by matching the bending vertical direction of the bending portion 16 with the vertical direction. Therefore, a liquid such as distilled water ejected from the ejection port 60a of the air / water feeding nozzle 60 flows down downward from the ejection port 60a due to the influence of gravity.

  Further, when a gas or liquid such as distilled water or air is ejected from the ejection port 60a of the air / water feeding nozzle 60 and suction is performed by the treatment instrument channel 19, the treatment instrument channel 19 provided on the lower side of the distal end cover 24 is provided. Due to the suction force from the opening 26, the liquid or the gas receives a force attracted in the direction of the opening 26, and the flow changes to the curved lower side.

Such circumstances, the endoscope 2 of the present embodiment, the distal end surface of the distal end cover 24, the observation lens 31b of the fluorescent image pickup unit 31B is, the center O of the observation lens 31a of the center O ₂ and the normal light image pickup unit 31A ₁ is shifted by a predetermined angle θ2 toward the curved lower side of the curved portion 16 with respect to the arrow line AR, which is the ejection direction of a liquid such as distilled water ejected from the ejection port 60a of the air / water feeding nozzle 60. Has been.

  Therefore, the observation lens 31b located farther than the observation lens 31a from the air / water supply nozzle 60 on the distal end surface of the distal end cover 24 is liquid such as distilled water that has flowed down to the curved lower side than the ejection direction due to the influence of gravity. Are efficiently sprayed and washed in a clean state to ensure a good observation field. Furthermore, the observation lens 31b is similarly efficiently sprayed and washed in a clean state even in a gas or liquid such as distilled water or air whose flow changes to the lower side of the curve by suction. Is secured.

  Further, in the endoscope 2 inserted into the body cavity of the patient, dirt or the like is attached to the insertion portion 11. In particular, the front end surface of the front end cover 24 is a surface that is substantially perpendicular to the insertion direction, and dirt and the like are likely to adhere thereto. In particular, the observation lens 31a of the normal light imaging unit 31A and the observation lens 31b of the fluorescence imaging unit 31B need to surely wash the attached dirt and the like in order to secure their respective observation fields.

  Furthermore, the endoscope 2 has a higher frequency of observing the inside of the body cavity of a patient with normal light than with fluorescence observation, and is superior to normal light observation with respect to observation with the density of a tissue pigment by fluorescence observation. It is necessary to ensure a good observation field. That is, it is better for the endoscope to have a larger amount of light for photographing during normal light observation. Therefore, the normal light imaging unit 31A has an observation having a lens diameter (outer diameter) larger than the lens diameter (outer diameter) of the observation lens 31b that guides light incident on the fluorescence imaging unit 31B for imaging. Light for imaging is taken in from the lens 31a.

In other words, the observation lens 31a has a lens diameter (outer diameter) larger than that of the observation lens 31b, and condenses incident light on the imaging element 33 of the normal light imaging unit 31A provided on the imaging side of incident light. To do.
Further, gas liquid such as distilled water or air ejected from the ejection port 60a of the air / water feeding nozzle 60 spreads from the ejection port 60a toward the far side in the ejection direction.

  Due to such circumstances, as shown in FIG. 10, the endoscope 2 of the present embodiment has a lens diameter (outer diameter) rather than a lens diameter (outer diameter) of the observation lens 31b of the fluorescence imaging unit 31B. The observation lens 31a of the normal light imaging unit 31A having a large diameter is disposed at the position of the distal end surface of the distal end cover 24 on the far side from the air / water feeding nozzle 60. As described above, the entire outer surface of the observation lens 31a is included in the ejection range A of gas / liquid such as distilled water or air ejected from the ejection port 60a of the air / water feeding nozzle 60.

  As a result, the endoscope 2 has an ejection port 60a in which the observation lens 31a having a large lens diameter (outside diameter) to which body fluid, dirt, etc. are likely to adhere is disposed on the far side from the air / water feeding nozzle 60. The entire outer surface of the observation lens 31a can be reliably washed in the ejection range A in which gas-liquid such as distilled water or air ejected from the air spreads.

In the endoscope 2 according to the present embodiment, as described above, the air / water feeding nozzle 60, the observation lens 31a of the normal light imaging unit 31A, and the observation lens 31b of the fluorescence imaging unit 31B include the distal end cover 24 shown in FIG. Are arranged side by side on a substantially straight line. Further, on the arrow line AR, which is the direction of gas / liquid ejection, such as distilled water or air ejected from the ejection port 60a of the air / water feeding nozzle 60, other components are disposed on the distal end surface of the distal end cover 24. Absent.
That is, on the arrow line AR, no other component is disposed on the distal end surface of the distal end cover 24 from the observation lens 31b of the fluorescence imaging unit 31B.

  With such a configuration, the gas-liquid that has cleaned dirt and the like attached to the observation lenses 31a and 31b does not flow to other components, and the outer edge of the tip cover 24 faces the direction of the arrow line AR that is the ejection direction. Flowing into. As a result, the distal end surface of the distal end cover 24 of the endoscope 2 is surely washed when a gas / liquid jet such as distilled water or air from the air / water feeding nozzle 60 is ejected.

Next, with reference to FIG. 10 and FIG. 11, the arrangement of the two illumination lenses 25a and 25b disposed on the distal end cover 24, the opening 26 of the treatment instrument channel 19 and the opening 27 of the front water supply channel 20 is described in detail. explain.
As described above, the distal end surface of the distal end cover 24 is disposed at a curved left and right position so as to sandwich the observation lens 31b of the fluorescence imaging unit 31B in which the two illumination lenses 25a and 25b are disposed substantially at the center. The opening 26 of the instrument channel 19 is disposed at the lower left position of the observation lens 31b, and the opening 27 of the front water supply channel 20 is disposed at the upper right position of the observation lens 31b.

  Of these two illumination lenses 25a and 25b, the illumination lens 25a located far from the air / water supply nozzle 60 has a liquid or gas ejection range from the air / water supply nozzle 60 whose entire outer surface is located. The tip cover 24 is disposed on the tip surface so as to be included in A.

  That is, the endoscope 2 of the present embodiment has a plurality of, here two, illumination lenses 25a and 25b. The entire outer surface of the illumination lens 25a, which is at least one of the two two illumination lenses 25a and 25b, is included in the liquid or gas ejection range A ejected from the ejection port 60a of the air / water feeding nozzle 60. .

  Accordingly, at least one illumination lens 25a is reliably cleaned of adhering dirt and the like with the liquid or the gas. Therefore, attenuation of the amount of illumination light by the illumination lens 25a is prevented, and a sufficient amount of light can enter the imaging units 31A and 31B, and the observation performance of the endoscope 2 can be maintained.

  Further, as shown in FIG. 10, the opening 26 of the treatment instrument channel 19 and the opening 27 of the front water supply channel 20 are such that the entire hole surface thereof is gas such as distilled water or air from the outlet 60 a of the air / water supply nozzle 60. It is disposed on the distal end surface of the distal end cover 24 outside the area of the gas / liquid ejection range A, which is the range in which the liquid is ejected so as to diffuse.

  More specifically, as shown in FIG. 11, the opening 26 of the treatment instrument channel 19 extends along an arrow line AR indicating a jet direction of gas liquid such as distilled water or air from the jet outlet 60a of the air / water feed nozzle 60. It is a region on the lower side of the tip surface of the tip cover 24 that is divided into two, and is disposed in a region B on the tip surface of the tip cover 24 that does not include the gas-liquid ejection range A.

  The opening 27 of the front water supply channel 20 is a region above the tip surface of the tip cover 24 that bisects along the arrow line AR, and the tip surface of the tip cover 24 does not include the gas-liquid ejection range A. In the region C.

In other words, each of the openings 26 and 27 is disposed on the tip surface of the tip cover 24 at a position that is substantially symmetric with respect to the arrow line AR that indicates the ejection direction of gas-liquid such as distilled water or air. That is, the position where the center O ₆ of the center O ₅ and the opening 27 of the opening 26 is spaced a predetermined distance, each opening 26 and 27 is disposed on the distal end surface of the distal end cover 24.

  As described above, in the endoscope 2 according to the present embodiment, the opening 26 of the treatment instrument channel 19 and the opening 27 of the front water supply channel 20 are located at the distal end surface of the distal end cover 24. Since it is disposed outside the region of the liquid ejection range A, gas liquid such as distilled water or air ejected from the air / water feeding nozzle 60 can be prevented from flowing into the openings 26 and 27.

  Thereby, gas-liquid such as distilled water or air ejected from the air / water feeding nozzle 60 is surely sprayed to the observation lens 31b of the far-side fluorescent imaging unit 31B. As a result, the observation lens 31b of the fluorescence imaging unit 31B is reliably and efficiently sprayed with gas and liquid, washed in a clean state, and a good observation field is ensured.

Further, the openings 26 and 27 are disposed on the distal end surface of the distal end cover 24 so that the respective centers O ₅ and O ₆ are separated from each other by a predetermined distance. Accordingly, when the endoscope 2 ejects a liquid such as distilled water from the opening 27 of the front water supply channel 20 while performing the suction operation from the opening 26 by the treatment instrument channel 19, the suction force to the opening 26 is obtained. The liquid can be ejected toward the affected part in the body cavity without being affected by the above. That is, the endoscope 2 according to the present embodiment is configured such that the ejection direction of the liquid ejected from the opening 27 is not disturbed by the suction from the opening 26.

  The endoscope 2 of the present embodiment having the various features (effects) described above includes an air / water supply nozzle 60 provided on the distal end surface of the distal end cover 24, an observation lens 31a of the normal light imaging unit 31A, and a fluorescence imaging unit 31B. When the observation lens 31b is arranged on a substantially straight line, a single air / water supply nozzle 60 sprays gas and liquid on the outer surfaces of the observation lenses 31a and 31b to set them in a clean state to ensure a good observation field. I can do it.

  Furthermore, in the endoscope 2 according to the present embodiment, the observation lens 31b of the fluorescence imaging unit 31B is less likely to have mucous membranes, blood, dirt, and the like attached thereto, and the observation field of view is not easily obstructed by the folds in the intestine. By being arranged at the approximate center of the distal end surface of the distal end portion 15 which is the surface, mucous membrane, blood, filth, etc., compared to the observation lens 31a of the normal light imaging unit 31A disposed on the outer peripheral side of the distal end surface And the observation visual field due to the folds in the intestine can be prevented, and in particular, the observation performance of the fluorescence imaging unit 31B can be sufficiently exhibited.

The special light observation may be not only fluorescence observation but also an enlargement optical system having an enlargement magnification (desirably, an enlargement ratio of 100 times or more) at a histological observation level including cells and glandular structures.
It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the invention.

It is explanatory drawing which showed the endoscope system schematically. It is a perspective view which shows the front-end | tip cover of an endoscope. It is a perspective view which shows the front-end | tip cover of an endoscope. It is the top view which looked at the front-end | tip cover from the front. It is sectional drawing of the front-end | tip part and curved part cut along the AA line of FIG. It is sectional drawing of the front-end | tip part cut | disconnected along the BB line of FIG. It is sectional drawing which shows the branch part of an air / water supply pipeline. It is sectional drawing of the front-end | tip part cut | disconnected along CC line of FIG. It is sectional drawing of the front-end | tip part cut | disconnected along the DD line | wire of FIG. It is the top view which looked at the front-end | tip cover from the front. It is the top view which looked at the front-end | tip cover from the front.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Endoscope system, 2 ... Endoscope, 3 ... Light source device, 4 ... Processor, 5 ... Monitor, 6 ... Air / water supply device, 7a ... Wire Guard, 7 ... Bending piece, 8 ... Bending operation wire, 9 ... Bending blade, 10 ... Outer skin, 10a ... Adhesion part, 11 ... Insertion part, 12 ... Operation part , 13 ... Universal cable, 14 ... Connector, 15 ... Tip, 15a ... Cylindrical member, 15b ... Reinforcement ring, 16 ... Curved part, 17 ... Flexible tube part , 18a: fixing portion, 18 ... fixing ring, 19 ... treatment instrument channel, 19b ... treatment instrument conduit, 19a ... pipe member, 20 ... forward water supply channel, 20b ... Front water supply pipe, 20a ... pipe member, 21 ... light guide, 21a ... cylindrical member, 22 ... End portion, 23a ... holding frame, 23 ... illumination lens unit, 24 ... tip cover, 24 ... tip cover, 25, 25a, 25b ... illumination lens, 26, 27 ... opening Part, 28 ... tube, 29 ... outer skin, 30 ... curved blade, 31a, 31b ... observation lens, 31A ... imaging unit for normal light observation, 31B ... imaging unit for fluorescence observation 32B ... objective lens, 32 ... lens unit, 32a-32d ... lens frame, 32A-32D ... lens group, 33a ... cover lens, 33, 38 ... imaging element, 34 ... Circuit board, 35b ... Insulating tube, 35a ... Reinforcement ring part, 40 ... Cover lens, 36 ... Lens unit, 36a, 36b ... Lens frame, 36A, 36B ..Le 36, lens unit, 38a, 38b ... signal cable, 38c ... signal line, 38 ... image sensor, 39 ... circuit board, 42 ... relay board, 43 ... Signal cable, 44 ... scope cable, 45a, 45b ... drive circuit, 46 ... signal processing circuit, 47, 58 ... control circuit, 48a, 48b ... control switch, 49a ... Signal line 49c ... Switching signal line 49d ... Control signal line 50 ... Branch tube 51 ... Lamp 52 ... Collimator lens 53 ... Rotary filter 54 ... Condensing lens, 55, 57 ... motor, 56 ... rack, 58 ... control circuit, 60a ... jet port, 60 ... air / water nozzle, 60a ... opening, 61a ..Air supply pipes, 61 ... Air supply / water supply pipes Road, 61b ... Water supply pipeline, 62 ... Pipe member, 63 ... Air / water supply button, A ... Blowout range, AR ... Arrow line
Agent Patent Attorney Susumu Ito

Claims (5)

An endoscope insertion portion having an insertion portion having a distal end portion, a first imaging means for obtaining a first observation image, and a second imaging means for obtaining a second observation image. ,
A first objective optical system that is disposed at the distal end and collects photographing light incident on the first imaging means;
A second objective optical system that is arranged at the tip and collects the photographic light incident on the second imaging means;
In the first objective optical system and the second objective optical system, the second objective optical system is disposed substantially at the center of the tip, and the first objective optical system is the second objective optical system. An endoscope insertion portion, wherein the endoscope insertion portion is disposed so as to have an optical axis on an outer peripheral side of the distal end portion with respect to the optical axis.   The first imaging means is for obtaining a normal light observation image as a first observation image, and the second imaging means is for obtaining a special light observation image as a second observation image. The endoscope insertion portion according to claim 1, wherein the insertion portion is an endoscope.   The endoscope insertion unit according to claim 2, wherein the special light observation image is a fluorescence observation image.   The endoscope according to any one of claims 1 to 3, wherein one of the first optical system and the second optical system is an optical system having a higher magnification than the other. Insertion part. The endoscope provided with the insertion part for endoscopes in any one of Claims 1-4.

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