JP5653841B2 - Endoscope - Google Patents

Description

  The present invention relates to an endoscope provided with a conduit for ejecting or sucking fluid.

  The endoscope has an observation window for capturing the image light of the subject at the distal end of the insertion portion to be inserted into the subject, an illumination window for irradiating the subject with illumination light, and the observation window. A fluid ejection nozzle that ejects fluid (cleaning water or air) and a suction port. Conventionally, the observation window is generally provided at a position exposed from the distal end surface of the insertion portion, and the illumination window, the fluid ejection nozzle, and the suction port are arranged around the observation window. Since bodily fluids and dirt in the subject adhere to the surface of the observation window, cleaning water is ejected from the ejection port of the fluid ejection nozzle to remove dirt from the observation window, and air is further ejected to inject the surface of the observation window. Blow away the wash water. Further, when filth such as bodily fluids and mucous membranes or sewage containing filth stays in the observation range, the filth and sewage are sucked from the suction port and removed from the observation range.

  On the other hand, in the endoscope described in Patent Document 1, a water repellent treatment layer having high water repellency is provided on the surface of an observation window or the like. By providing this water-repellent treatment layer, hydrophilic filth adhesion is weakened so that no droplets of cleaning water remain.

JP 7-303600 A

  However, there are hydrophilic and hydrophobic soils such as body fluids and mucous membranes in the subject, and even if a water-repellent treatment layer is provided on the surface, adhesion of hydrophilic soils can be weakened. Adhesion cannot be weakened for hydrophobic soils. Furthermore, in endoscopy, observation may be performed by bringing an observation window close to the surface of the subject, and filth may also adhere to the fluid ejection nozzle and suction port located near the observation window. Even if the water-repellent treatment layer described in Patent Document 1 is provided on the fluid ejection nozzle and the suction port, there is a problem that there is dirt that cannot be weakened and the fluid ejection nozzle and the suction port are clogged. In addition, if the filth adheres firmly, it cannot be removed by washing, and the endoscope becomes unusable.

  The present invention has been made in view of the above problems, and provides an endoscope that prevents filth from adhering to a conduit for ejecting or sucking fluid, and can easily be peeled off even if filth adheres. The purpose is to provide.

  An endoscope of the present invention is provided at a distal end portion of an insertion portion to be inserted into a subject, an observation window for observing the inside of the subject, and an illumination window for irradiating illumination light into the subject And a pipe line for jetting or sucking fluid, and a minute protrusion formed so as to be spread on the inner wall surface of the pipe line at a predetermined interval. .

  The microprotrusions preferably have an outer diameter of 10 μm or more and 500 μm or less. Moreover, it is preferable that the said microprotrusion is formed in the ratio of the area in the said inner wall surface of 10% or more and 70% or less.

  Furthermore, the microprojections are preferably hemispherical. One of the microprojections and the inner wall surface is preferably made of a hydrophilic material and the other is made of a hydrophobic material.

  The conduit is preferably a fluid ejection nozzle for ejecting fluid. Alternatively, the conduit is preferably a treatment instrument insertion conduit that allows fluid to be sucked and a treatment instrument to be inserted.

  According to the endoscope of the present invention, the minute protrusions are formed so as to be spread at a predetermined interval on the inner wall surface of the pipe line for jetting or sucking the fluid, so that filth adheres to the pipe line. Can be easily removed even if filth adheres.

It is an external appearance perspective view of an electronic endoscope system. It is a perspective view which shows the structure of the front-end | tip part of an electronic endoscope. It is sectional drawing along the AA line of FIG. It is sectional drawing of a fluid injection nozzle periphery. It is explanatory drawing which shows the manufacturing method which manufactures a fluid injection nozzle. It is explanatory drawing which shows another manufacturing method which manufactures a fluid injection nozzle. It is sectional drawing along the BB line of FIG.

  As shown in FIG. 1, an electronic endoscope system 10 includes an electronic endoscope 11, a processor device 12, a light source device 13, an air / water supply device 14, a suction pump 15, and the like. The air / water supply device 14 is built in the light source device 13 and is a well-known air supply device (pump or the like) 14a for supplying air, and a washing water tank that is provided outside the light source device 13 and stores washing water. 14b. The electronic endoscope 11 is connected to a flexible insertion portion 16 that is inserted into the body of a subject, an operation portion 17 that is connected to a proximal end portion of the insertion portion 16, a processor device 12, and a light source device 13. Connector 18, and a universal cord 19 that connects between the operation unit 17 and the connector 18. The connector 18 is a composite type connector to which the processor device 12, the light source device 13, and the air / water supply device 14 are connected.

  The insertion portion 16 is provided at the distal end thereof, and includes a distal end portion 16a having a built-in CCD type image sensor (see FIG. 3, hereinafter referred to as CCD) 39 as an imaging element for in-subject imaging, and a distal end portion 16a. It comprises a bendable bending portion 16b provided continuously at the base end, and a flexible flexible tube portion 16c provided continuously at the base end of the bending portion 16b. Hereinafter, the distal end side of the insertion portion 16 is simply referred to as “distal end side”, and the proximal end side of the insertion portion 16 is simply referred to as “proximal end side”.

  The processor device 12 is electrically connected to the light source device 13 and comprehensively controls the operation of the electronic endoscope system 10. The processor device 12 supplies power to the electronic endoscope 11 through the universal cord 19 and a transmission cable inserted into the insertion portion 16 and controls the drive of the CCD 39. In addition, the processor device 12 acquires an imaging signal output from the CCD 39 via a transmission cable, and performs various image processing to generate image data. The image data generated by the processor device 12 is displayed as an observation image on the monitor 20 connected to the processor device 12 by a cable.

  An air supply / water supply channel 21 (see FIG. 3) is arranged inside the insertion section 16 and the operation section 17, and the air supply / water supply channel 21 is provided with an air supply / water supply nozzle (provided at the distal end portion 16 a). It is connected to a fluid ejection nozzle 22 (see FIGS. 2 to 4). The air / water supply channel 21 is connected to the air / water supply device 14 through the universal cord 19.

  The operation unit 17 is provided with a treatment instrument inlet 23 through which various treatment instruments having an injection needle, a high-frequency knife and the like are inserted, an air supply / water supply button 24, an intake button 25, a bending operation knob 26, and the like. It has been. When the air supply operation is performed by the air supply / water supply button 24, the air generated by the air supply device 14a is sent to the air supply / water supply nozzle 22, and when the water supply operation is performed, the air pressure generated by the air supply device 14a is Wash water is sent from the wash water tank 14 b to the air / water feed nozzle 22. The air / water supply nozzle 22 selectively injects air and cleaning water supplied via the air / water supply channel 21.

  Further, a treatment instrument insertion channel 36 (see FIG. 7) described later is connected to the treatment instrument inlet 23. The treatment instrument inlet 23 is closed by a stopper (not shown) except when the treatment instrument is inserted. A suction passage 36a branches off from the treatment instrument insertion channel 36. The suction passage 36 a is connected to the suction button 25. A suction pump 15 is connected to the suction button 25 via a connecting tube 27. When the suction operation is performed by the suction button 25, suction is performed by the negative pressure generated by the suction pump 15, and when the blocking operation is performed, the negative pressure is blocked and the suction is stopped.

  When the bending operation knob 26 is operated, the bending portion 16b is bent in the vertical and horizontal directions by pushing and pulling the wire inserted in the insertion portion 16. Thereby, the front-end | tip part 16a is orientated in the desired direction in a body cavity.

  As shown in FIGS. 2 and 3, the distal end portion 16 a includes a distal end portion main body 28, a cap-shaped distal end protective cap 29 attached to the distal end side of the distal end portion main body 28, an observation window 30, first and second. Illumination windows 31 and 32, a treatment instrument outlet 33 (suction port), and an air / water supply nozzle 22. In the distal end portion body 28, through holes 28 a to 28 c are formed along the axial direction of the insertion portion 16 to hold components such as an air / water supply nozzle 22, an objective lens unit 37 to be described later, and a treatment instrument insertion channel 36. ing. The rear end of the distal end portion main body 28 is connected to a bending piece 34 on the distal end side that constitutes the bending portion 16b.

  The tip protection cap 29 includes a tip plate portion 29 a that covers the tip side of the tip portion main body 28, and a cylindrical portion 29 b that covers the outer peripheral surface of the tip portion main body 28. An outer skin layer 35 covering the outer peripheral surface of the curved portion 16b extends to the distal end body 28, the distal end of the outer skin layer 35 and the rear end of the cylindrical portion 29b are brought into contact with each other, and the end portions are fixed with an adhesive or the like. .

  When viewed from the distal end side, the distal end plate portion 29 a has through holes 29 c to expose the observation window 30, the first and second illumination windows 31, 32, the air / water feeding nozzle 22, and the treatment instrument insertion channel 36. 29 g is formed. The illumination windows 31 and 32 are arranged at symmetrical positions with the observation window 30 in between.

  The observation window 30 is a state-of-the-art objective lens that constitutes the objective lens unit 37, and also serves as a cover glass. The optical system of the objective lens unit 37 including the observation window 30 is held by a lens barrel 38. The lens barrel 38 holds the proximal end side of the outer peripheral surface of the observation window 30. The observation window 30 is fitted in the through hole 29 c of the tip protection cap 29 at the tip end side of the outer peripheral surface. The lens barrel 38 is fitted in the through hole 28 a of the tip body 28 and attached so that the tip surface abuts against the tip plate portion 29 a of the tip protection cap 29.

  A CCD 39 is attached to the back of the objective lens unit 37. The CCD 39 is composed of, for example, an interline transfer type CCD, and a subject image captured by the optical system of the objective lens unit 37 is formed on the imaging surface. Note that the image sensor is not limited to the CCD 39 but may be a CMOS.

  The illumination windows 31 and 32 also serve as irradiation lenses, and irradiate illumination light from the light source device 13 to an observation site in the subject. In these illumination windows 31 and 32, the light guide (not shown) exit end faces the back side. The light guide is formed by bundling a number of optical fibers, fitting a base on the tip side, and covering the outer peripheral surface with a tube. The light guide passes through the insertion portion 16, the operation portion 17, the universal cord 19, and the connector 18, and guides the illumination light from the light source device 13 to the illumination windows 31 and 32.

  The air / water supply nozzle 22 is integrally formed with an injection cylinder portion 22a on the distal end side and a connection cylinder portion 22b on the proximal end side. The connecting cylinder portion 22 b is connected to the air / water supply channel 21 by being fitted to the outer peripheral surface on the front end side of the air / water supply channel 21. Further, the connecting cylinder part 22 b and the air / water supply channel 21 are fitted in the through hole 28 b of the tip end body 28. The injection cylinder portion 22 a is formed in a cylindrical shape that is smoothly bent from the connection cylinder portion 22 b to the injection port 22 c at the tip, and is exposed to the outside through the through hole 29 f of the tip protection cap 29.

  A plurality of minute protrusions 40 are formed on the inner wall surface 22 d of the air / water supply nozzle 22. As shown in FIG. 4, the minute protrusions 40 are formed so as to be spread in a staggered arrangement. The arrangement of the minute protrusions 40 is not limited to this, and it is only necessary that the minute protrusions 40 are arranged at a predetermined interval D1 on the inner wall surface 22d. Here, the “predetermined interval” includes that the minute protrusions 40 are arranged at substantially the predetermined interval D1. By arranging the minute projections 40 in this way, moisture tends to remain between the minute projections 40 on the inner wall surface 22d. The hydrophilic / hydrophobic filth is difficult to adhere to the inner wall surface 22d of the air / water supply nozzle 22, and even when the filth adheres, the attached filth is easily peeled off. The microprotrusions 40 are provided at least in a range from the tip of the inner wall surface 22d to 1 cm. However, the present invention is not limited to this, and the inner wall surface 22d may be provided on the entire surface from the distal end to the proximal end.

  The microprojections 40 are preferably formed in a hemispherical shape. Reference numeral R1 indicates the outer diameter (diameter) of the minute protrusion 40, and reference numeral H1 indicates the height of the minute protrusion 40. The outer diameter R1 and height H1 of the microprojections 40 are preferably 10 μm or more and 500 μm or less. Moreover, it is preferable that the fine protrusion 40 has an area ratio of 10% or more and 70% or less on the inner wall surface 22d. It is preferable that the predetermined interval D1 for arranging the microprojections 40 is larger than the outer diameter of the microprojections 40. The outer diameter R1 and the height H1 of the microprojections 40 may all be formed uniformly, or may be formed so as to have various dimensions within a range of 10 μm or more and 500 μm or less.

The air / water supply nozzle 22 is manufactured as follows, for example. First, as shown in FIG. 5A, a belt-like material 50 in which minute projections 52 are arranged so as to be spread on one side of a thin belt-like material main body 51 at a predetermined interval is formed. The belt-like material 50 is made of a resin having flexibility, and is formed integrally with the minute protrusions 52. The minute protrusion 52 corresponds to the minute protrusion 40 of the air / water supply nozzle 22.
In addition, it is preferable to form the strip | belt-shaped material main body 51 with hydrophilic resin, and to form the microprotrusion 52 with hydrophobic resin. As a result, in the air / water supply nozzle 22, the fine protrusions 40 are hydrophobic, and the other inner wall surface 22d is hydrophilic.

  Then, as shown in FIG. 5B, the belt-shaped material 50 is wound around the core material 55 with the surface on which the minute protrusions 52 are formed inside. The core material 55 is formed in accordance with the inner diameter and the bending state of the air / water supply nozzle 22. At this time, an adhesive is applied to a portion where the wound belt-like material 50 overlaps. After the adhesive is dried in the state of being wound around the core material 55 as described above, the core material 55 is pulled out to form a pipe-shaped air / water supply nozzle 22 bent from the belt-shaped material 50. Further, after that, a resin or the like is applied to the surface of the belt-like material 50 (the surface opposite to the surface on which the fine protrusions 52 are disposed) and cured, so that the air / water supply nozzle 22 has rigidity. May be.

  In addition, the manufacturing method of the air / water supply nozzle 22 is not limited to the above-described method. For example, as illustrated in FIG. 6, the air / water supply nozzle 22 includes two molded parts 56 and 57. These molded parts 56 and 57 may be bonded together. In this case, in the molded parts 56 and 57, the minute projections 40 are integrally formed on the surfaces 56a and 57a corresponding to the inner wall surface 22d of the air / water supply nozzle 22, and the molded parts 56 and 57a face each other. , 57 are pasted together. In addition, also when manufacturing the air / water supply nozzle 22 by this manufacturing method, it is preferable to make the microprotrusion 40 hydrophobic and the other inner wall surface 22d hydrophilic.

  As shown in FIG. 7, the treatment instrument insertion channel 36 (treatment instrument insertion conduit) is fitted into the through hole 28 c of the distal end portion body 28 and the through hole 29 g of the distal end cap 29, and the treatment instrument of the operation portion 17. It communicates with the inlet 23. The distal end side of the inner peripheral surface of the treatment instrument insertion channel 36 is a treatment instrument outlet 33, and various treatment instruments inserted from the treatment instrument inlet 23 into the treatment instrument insertion channel 36 have their distal ends at the treatment instrument outlet. 33 is exposed. In the treatment instrument insertion channel 36, filth and sewage are sucked from the treatment instrument outlet 33 by operating the suction button 25 described above.

  On the inner wall surface 36 a of the treatment instrument insertion channel 36, a plurality of minute protrusions 41 are formed in the same manner as the inner wall surface 22 d of the air / water supply nozzle 22. The minute protrusions 41 are formed so as to be spread in a staggered arrangement. However, the present invention is not limited to this, and it is only necessary that the minute protrusions 41 are arranged at a predetermined interval D2 on the inner wall surface 36a. Here, the “predetermined interval” includes that the minute protrusions 41 are arranged at a substantially predetermined interval D2. This makes it difficult for filth to adhere to the inner wall surface 36a of the treatment instrument insertion channel 36, and even when filth adheres, the attached filth tends to peel off.

  The microprojections 41 of the treatment instrument insertion channel 36 are preferably formed in a hemispherical shape like the microprojections 40. Reference numeral R2 indicates the outer diameter (diameter) of the minute protrusion 41, and reference numeral H2 indicates the height of the minute protrusion 41. The outer diameter R2 and height H2 of the microprojections 41 are preferably 10 μm or more and 500 μm or less. Moreover, it is preferable that the fine protrusion 41 has an area ratio of 10% or more and 70% or less on the inner wall surface 36a. Furthermore, it is preferable that the predetermined distance D <b> 2 for arranging the microprojections 41 is larger than the outer diameter of the microprojections 41.

  When the treatment instrument insertion channel 36 is manufactured, as in the case of the air / water supply nozzle 22, a method of winding a strip-like material integrally formed with minute protrusions around a core material to form a pipe, It can be manufactured by a method in which two formed parts are bonded to each other. In the treatment instrument insertion channel 36, it is preferable that the microprojections 41 are hydrophobic and the other inner wall surface 36 a is hydrophilic, like the air / water supply nozzle 22. Further, when the treatment tool insertion channel 36 is formed by wrapping a belt-like material integrally formed with microprotrusions around the core material, the belt-like material body is formed of a hydrophilic resin in the same manner as the air / water supply nozzle 22. It is preferable to form the microprotrusions with a hydrophobic resin.

  When filth enters the air / water supply nozzle 22 or the treatment instrument insertion channel 36 during the endoscopic inspection using the electronic endoscope 11, as described above, the minute protrusions 40, 41 on the inner wall surfaces 22d, 36a. Since it is provided, it is difficult to adhere even if the soil is hydrophilic or hydrophobic. Furthermore, even if filth adheres to the inner wall surface 22d in the air / water feed nozzle 22, it is easy to peel off, and when fluid (air or washing water) is jetted during endoscopic examination, Often washed away by fluid. In addition, even in the treatment instrument insertion channel 36, even if filth adheres to the inner wall surface 36a, the treatment instrument insertion channel 36 is easily peeled off like the air supply / water supply channel 22, and is attached by passing the sucked moisture and air. Often filth is washed away.

  As described above, in the electronic endoscope 11, the air supply / water supply nozzle 22 and the treatment instrument insertion channel 36 are provided with the minute protrusions 40 and 41 on the inner wall surfaces 22d and 36a. Any filth is difficult to adhere, and even if filth adheres to the inner wall surfaces 22d and 36a, it is easy to peel off. Furthermore, even if filth remains on the inner wall surfaces 22d and 36a of the air / water feed nozzle 22 and the treatment instrument insertion channel 36 after the endoscopic examination, the filth is easily peeled off from the inner wall surfaces 22d and 36a. By washing, filth can be easily removed.

  In the above-described embodiment, the microprojections 40 and 41 are formed in a hemispherical shape. Moreover, in the said embodiment, although the microprotrusions 40 and 41 are formed in the inner wall surfaces 22d and 36a of the air supply / water supply nozzle 22 and the treatment instrument insertion channel 36, this invention is not limited to this, The inner wall surfaces 22d, 36a may be formed in an uneven shape. In this case, convex portions and concave portions having uniform dimensions may be formed at predetermined intervals, or may be formed into concave and convex shapes formed with concave portions and convex portions having various dimensions. Also good. Moreover, in the said embodiment, although the microprotrusions 40 and 41 of the air / water supply nozzle 22 and the treatment instrument insertion channel 36 are made hydrophobic, and the other inner wall surfaces 22d and 36a are made hydrophilic, the present invention is not limited to this. The microprotrusions may be hydrophilic and the other inner wall surfaces may be hydrophobic. Further, in this case, for example, the belt-like material body is formed of a hydrophobic resin, the minute protrusions are formed of a hydrophilic resin, and the air / water supply nozzle 22 and the treatment instrument insertion channel 36 are formed in the same manner as in the above embodiment. Form.

  In the above-described embodiment, an electronic endoscope for observing an image obtained by imaging the state of a subject using an image sensor has been described as an example. However, the present invention is not limited to this, and an optical image is used. The present invention can also be applied to an endoscope that employs a guide and observes the state of a subject.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated concretely, the content of this invention is not limited to these. In Example 1, the air / water supply nozzle 22 having the configuration of the first embodiment was clogged with small chopped pork liver as a paste material having the same particle size and viscosity as filth in the body. . Note that the paste material is not limited to this, and for example, a jam containing potato seeds may be used. As the air / water supply nozzle 22 used in the first embodiment, the inner diameter is 1 mm, the minute protrusion 40 is hemispherical, the outer diameter R1 of the minute protrusion 40 is 10 μm, and the minute protrusion 40 is disposed on the inner wall surface 22d. The ratio of the area to be made was 50%. Then, cleaning water was sent to the air / water supply nozzle 22 in a state where the paste material was clogged, and the discharge state of the paste material was examined. The liquid pressure fed into the air / water feeding nozzle 22 is a general liquid pressure fed into the air / water feeding nozzle 22 from the air / water feeding device.

  Except that the outer diameter R1 of the microprotrusions 40 was set to 100 μm, the air / water supply nozzle 22 was formed in the same configuration as in Example 1, and the discharge condition was checked by clogging the paste material under the same conditions.

  Except that the outer diameter R1 of the microprotrusions 40 was set to 200 μm, the air / water supply nozzle 22 was formed in the same configuration as in Example 1, and the discharge condition was checked by clogging the paste material under the same conditions.

  Except that the outer diameter R1 of the microprotrusions 40 was set to 500 μm, the air / water supply nozzle 22 was formed in the same configuration as in Example 1, and the discharge condition was checked by clogging the paste material under the same conditions.

  Except that the ratio of the area where the micro protrusions 40 are arranged on the inner wall surface 22d is 10%, the air / water supply nozzle 22 is formed in the same configuration as in the first embodiment, and the discharge condition is checked by clogging the paste material under the same conditions. It was.

  Except for 70% of the area where the fine protrusions 40 are arranged on the inner wall surface 22d, the air / water supply nozzle 22 is formed in the same configuration as in the first embodiment, and the discharge condition is checked by clogging the paste material under the same conditions. It was.

Except that the shape of the microprojections 40 was a quadrangular pyramid, the air / water supply nozzle 22 was formed in the same configuration as in Example 1, and the discharge state was examined by clogging the paste material under the same conditions.
[Comparative Example 1]
In Comparative Example 1, the air / water supply nozzle 22 was formed in the same configuration as in Example 1 except that the outer diameter of the microprojections 40 was 2 μm, and the paste material was clogged under the same conditions, and the discharge state was examined.
[Comparative Example 2]
Except that the outer diameter of the microprotrusions 40 was set to 700 μm, the air / water supply nozzle 22 was formed in the same configuration as in Example 1, and the discharge state was examined by clogging the paste material under the same conditions.
[Comparative Example 3]
Except that the ratio of the area where the minute protrusions 40 are arranged on the inner wall surface 22d is 5%, the air / water supply nozzle 22 is formed in the same configuration as in the first embodiment, and the discharge condition is checked by clogging the paste material under the same conditions. It was.
[Comparative Example 4]
Except for 80% of the area where the microprojections 40 are arranged on the inner wall surface 22d, the air / water feed nozzle 22 is formed with the same configuration as in Example 1, and the discharge condition is checked by clogging the paste material under the same conditions. It was.

  In Table 1 below, as the discharged state, the paste material remains very good (◎), almost no residue remains good (◯), and the paste material remains, but can be easily removed by washing and can be used ( (Triangle | delta), The adhesion result of a paste material is strong and washing | cleaning is difficult, and the evaluation result of unusable (x) is shown.

  As shown in Table 1, in the air / water supply nozzles 22 of Examples 1 to 4 in which the outer diameter R1 of the microprojections 40 is 10 μm, 100 μm, 200 μm, and 500 μm, all the evaluation results are usable or more, particularly In Example 2, it was very good. In contrast, Comparative Examples 1 and 2 in which the outer diameter R1 of the microprojection 40 was 2 μm and 700 μm were not usable. From the above, it was confirmed that the air supply / water supply nozzle 22 that hardly adheres dirt and easily peels off even if it adheres has an outer diameter of the microprojections 40 of 10 to 500 μm.

  Further, in Examples 1 to 4, in which the ratio of the area where the microprojections 40 are arranged on the inner wall surface 22d is 50%, in Example 5 in which 10% is used, and in Example 6 in which 70% is used, all the evaluation results are usable or more. was. On the other hand, the evaluation results were unusable in Comparative Examples 3 and 4 in which the ratio of the area on the inner wall surface 22d where the fine protrusions 40 were arranged was 5% and 80%. As described above, it is confirmed that the ratio of the area in which the minute projections 40 are arranged on the inner wall surface 22d of the air / water supply nozzle 22 is less than 10% and less than 70%. did.

  Furthermore, the evaluation result of Example 2 in which the microprojections 40 are hemispherical is very good, whereas the evaluation result of Example 7 in which the microprojections 40 are a quadrangular pyramid and other conditions are the same as in Example 2. Since the results remained usable, it was confirmed that the shape of the microprojections 40 is more effective when the shape is a hemisphere than the shape of a quadrangular pyramid.

DESCRIPTION OF SYMBOLS 10 Electronic endoscope system 11 Electronic endoscope 16 Insertion part 16a Tip part 21 Air supply / water supply channel 22 Air supply / water supply nozzle 22d, 36a Inner wall surface 30 Observation window 31, 32 Illumination window 36 Treatment instrument insertion channel 40, 41 Microprotrusions

Claims (7)

An observation window for observing the inside of the subject provided at the distal end of the insertion portion to be inserted into the subject;
An illumination window for irradiating illumination light into the subject;
A pipe line provided at the tip, for jetting or sucking fluid;
An endoscope comprising: microprojections formed so as to be spread on the inner wall surface of the duct at predetermined intervals.   The endoscope according to claim 1, wherein the minute protrusion has an outer diameter of 10 μm or more and 500 μm or less.   The endoscope according to claim 1 or 2, wherein the minute protrusions are formed at a ratio of the area of the inner wall surface of 10% or more and 70% or less.   The endoscope according to any one of claims 1 to 3, wherein the minute protrusion is hemispherical. The minute projections and the inner wall surface, one is made of hydrophilic material, the endoscope according to any one of claims 1 to 4, the other is to feature in that it consists of a hydrophobic material.   The endoscope according to any one of claims 1 to 5, wherein the conduit is a fluid ejection nozzle for ejecting fluid.   The endoscope according to any one of claims 1 to 5, wherein the conduit is a treatment instrument insertion conduit that allows a treatment instrument to be inserted while sucking a fluid.

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