JP2012090885A - Endoscope and cleaning nozzle for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope cleaning nozzle which can be easily positioned in a direction in which a fluid is stably jetted to an observation window when assembled.SOLUTION: The cleaning nozzle includes: a tubular portion 51 arranged on a cleaning nozzle 50 and having a flow path for allowing a fluid to flow thereinto from fluid paths 42, 43 arranged in an insertion portion 11 of an endoscope 2; a nozzle head 52 with a jetting port 55 for jetting the fluid to the observation window 34; a housing hole 38 to which the tubular portion 51 is inserted and fixed; and positioning means 54, 39 which are arranged on at least either the cleaning nozzle 50 or the housing hole 38, and regulate the position of the tubular portion 51 around a longitudinal axis so that the jetting port 55 of the nozzle head 52 can face a predetermined direction toward the observation window 34.

Description

  The present invention relates to an endoscope including an endoscope cleaning nozzle that supplies a fluid to the surface of an observation window for cleaning.

  As is well known, endoscopes widely used in the medical field have an elongated insertion portion that is inserted into a subject. In such an endoscope, an observation window is disposed at the distal end portion of the insertion portion.

  A cleaning nozzle is provided in the vicinity of the observation window at the tip to inject and clean the fluid to remove dirt that adheres to the surface of the observation window and impairs observation. There is.

  Such a cleaning nozzle is disclosed in Patent Document 1, for example. In Patent Document 1, there is provided an endoscope including a nozzle that is movable up and down by water pressure and strikes water obliquely from above toward the observation window in order to prevent the observation window from entering the field of view. It is disclosed.

JP-A-8-19512

  However, in the conventional endoscope described in Patent Document 1, since the nozzle (cleaning nozzle) is movable, the axis of the nozzle in the up and down direction is not defined, and water is directed toward the observation window. There are cases where the spray direction cannot be stably sprayed on the observation window for cleaning.

  In addition, some conventional cleaning nozzles are fixed by being inserted into the distal end of the insertion portion. For example, as shown in FIGS. 16 and 17, a conventional cleaning nozzle 100 is exposed on the outer surface of the distal end portion of an endoscope, and has a nozzle head 101 having an opening 102 that ejects fluid toward an observation window; It has a duct 103 extending from the nozzle head 101 and inserted into the tip.

  This conventional cleaning nozzle 100 has a configuration in which a cylindrical pipe line 103 is inserted into a tip portion and fixed by adhesion or screwing. In the cleaning nozzle 100 having such a configuration, the nozzle head 101 freely rotates around the axis of the pipe 103 when the pipe 103 is inserted into the distal end portion of the endoscope. There is a problem that it is difficult to position the opening 102 toward the center of the observation window.

  In addition, the conventional cleaning nozzle 100 is assembled in a direction in which cleaning water is stably sprayed to the observation window because the nozzle head 101 is displaced around the axis of the pipe line 103 at the time of adhesion or screwing to the tip. There was a problem that it was difficult.

  Therefore, the present invention has been made in view of the above circumstances, and provides an endoscope and an endoscope cleaning nozzle that can easily position a cleaning nozzle in a direction in which fluid is stably ejected to an observation window during assembly. For the purpose.

  An endoscope according to the present invention is an endoscope including a cleaning nozzle that ejects fluid toward the surface of an observation window disposed at a distal end portion of an insertion portion, the endoscope being disposed in the cleaning nozzle, A tubular portion provided with a flow path through which the fluid flows from a fluid path disposed in the insertion portion; a nozzle head provided continuously with the tubular portion and provided with a spout for ejecting the fluid to the observation window; An accommodation hole disposed at the distal end and fixed to the tubular portion by being inserted, and disposed in at least one of the cleaning nozzle and the accommodation hole, and the ejection port of the nozzle head is the observation And positioning means for defining a position around the longitudinal axis of the tubular portion so as to face a predetermined direction toward the window.

  The endoscope cleaning nozzle according to the present invention is an endoscope cleaning nozzle that jets and cleans a fluid toward the surface of an observation window disposed at the distal end portion of the endoscope, the distal end portion A tubular portion provided with a flow path through which the fluid flows from a fluid path disposed in the insertion portion of the endoscope, and connected to the tubular portion, to the observation window A nozzle head having a jet port for jetting fluid, and a position around the longitudinal axis of the tubular portion are arranged in the nozzle head so that the jet port faces a predetermined direction toward the observation window. And an indicator section.

  The endoscope and endoscope cleaning nozzle of the present invention have an effect that the cleaning nozzle can be easily positioned in a direction in which fluid is stably ejected to the observation window during assembly.

The perspective view which concerns on the 1st Embodiment of this invention and shows the whole structure of an endoscope system. The top view which shows the structure of the front-end | tip part of an insertion part similarly FIG. 2 is a sectional view taken along line III-III in FIG. Front view showing the configuration of the endoscope cleaning nozzle The perspective view which shows the structure of the nozzle head of the washing nozzle for endoscopes similarly The bottom view showing the configuration of the endoscope cleaning nozzle The top view which shows the structure of the fitting hole part and fitting groove which are formed in the front end surface of a front-end | tip part similarly The perspective view for demonstrating the state which attaches the washing nozzle for endoscopes to a front-end | tip part similarly A side view showing composition of a washing nozzle for endoscopes concerning a 2nd embodiment of the present invention. Front view showing the configuration of the endoscope cleaning nozzle XI arrow view of FIG. 10 XII-XII sectional view of FIG. The top view which shows the structure of the fitting hole part formed in a front-end | tip part similarly A top view showing an observation window and a nozzle head according to a second embodiment of the present invention. The modification is shown, (a) is a front view showing the configuration of the endoscope cleaning nozzle, and (b) is an enlarged view of a circular portion. Front view showing the configuration of a conventional endoscope cleaning nozzle XVII-XVII sectional view of FIG.

  The endoscope cleaning nozzle according to the present invention will be described below. In the following description, the drawings based on each embodiment are schematic, and the relationship between the thickness and width of each part, the thickness ratio of each part, and the like are different from the actual ones. It should be noted that the drawings may include portions having different dimensional relationships and ratios between the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to the drawings. 1 to 8 relate to the first embodiment of the present invention, FIG. 1 is a perspective view showing the overall configuration of the endoscope system, FIG. 2 is a plan view showing the configuration of the distal end portion of the insertion portion, and FIG. 2 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a front view showing the configuration of the endoscope cleaning nozzle, FIG. 5 is a perspective view showing the configuration of the nozzle head of the endoscope cleaning nozzle, and FIG. FIG. 7 is a bottom view showing the configuration of the mirror cleaning nozzle, FIG. 7 is a plan view showing the configuration of the fitting hole and the fitting groove formed on the tip surface of the tip, and FIG. 8 is the tip of the endoscope cleaning nozzle. It is a perspective view for demonstrating the state assembled | attached to.

An endoscope system 1 shown in FIG. 1 includes an endoscope 2, a light source device 5, a video processor 6 that is a CCU (camera control unit), and a monitor 7, and the main part is configured. .
As shown in the drawing, the endoscope 2 includes an insertion portion 11 as an elongated hollow elongated member to be inserted into an observation target site, and an operation portion 12 connected to the proximal end portion of the insertion portion 11. The universal cable 13 extended from the side surface of the operation unit 12, the light source connector 14 provided at the extended end of the universal cable 13, and the electric cable 15 extending from the side of the light source connector 14 And an electrical connector 16 disposed at the extending end of the electrical cable 15. The light source connector 14 is detachably connected to the light source device 5. The electrical connector 16 is detachably connected to the video processor 6.

  The insertion portion 11 has a distal end portion 21 on the distal end side, and a bending portion 22 as a movable portion that can be bent is connected to a rear portion of the distal end portion 21. Further, a long and flexible flexible tube portion 23 formed of a soft tubular member is connected to the rear portion of the curved portion 22.

  The operation unit 12 is arranged in the vicinity of the operation unit main body 20 constituting the operation gripping unit, the folding unit 24 connected to the proximal end side of the flexible tube unit 23 of the insertion unit 11, and the folding unit 24. And a treatment instrument insertion port 25 serving as an opening of the insertion channel in the insertion portion 11.

  The operation unit body 20 is provided with a bending operation knob 26 for bending the bending portion 22 of the insertion unit 11 and is provided with switches 28 and 29 for various endoscope functions. ing. The bending operation knob 26 includes a UD bending operation knob 26a for bending the bending portion 22 in the vertical direction, and an RL bending operation knob 26b for bending the bending portion 22 in the left-right direction. Are superimposed. In addition, a release knob 27 that is operated when stopping / releasing the rotation of each of the bending operation knobs 26a and 26b is provided at the center of the RL bending operation knob 26b.

  The light source device 5 supplies illumination light to the light guide (not shown) provided in the endoscope 2. That is, a light guide is disposed in the universal cable 13, the operation unit 12, and the insertion unit 11 of the endoscope 2 of the present embodiment, and the light source device 5 is connected to the distal end portion through the light guide. Illumination light is supplied to an illumination optical system, which will be described later, constituting the illumination window 21. This illumination light diverges by the illumination optical system and irradiates the test site.

  The video processor 6 converts the image data captured by the endoscope 2 into a video signal and displays it on the monitor 7. Further, the video processor 6 receives operation signals from the switches 29 disposed in the operation unit 12 of the endoscope 2, and controls the light source device 5 or drives a compressor (not shown) based on these signals. Or air is sent to a water supply tank (not shown) to supply air or water that is cleaning water in the water supply tank, physiological saline, or the like to the distal end portion 21 via the air supply / water supply channel of the insertion portion 11. A device for controlling water supply is also configured. The switches 28 are mechanical switches that are operated by the user during air / water feeding.

  On the distal end surface of the distal end portion 21, as shown in FIG. 2, a plurality of, here three, illumination windows 31, which are illumination optical systems, a channel opening 32 through which a treatment instrument and the like are led out, a front water supply channel opening 33, An observation window 34 that is an objective optical system, and an endoscope cleaning nozzle 50 that ejects liquid or gas (and gas-liquid mixed fluid) toward the surface of the observation window 34 are disposed. .

  Further, as shown in FIG. 3, a plurality of objective lenses 35 that are objective optical systems are arranged in parallel in the distal end portion 21, and a lens holding unit that holds the observation window 34 and the objective lens 35. A frame 36 is incorporated. An imaging unit 37 having an image sensor such as a CCD or CMOS is disposed behind the lens holding frame 36.

  The distal end portion 21 includes a distal end hard portion 40 of a metal block, and the distal end face 30 of the distal end hard portion 40 is covered with a resin distal end cover 30. A lens holding frame 36, an endoscope cleaning nozzle 50, and a fluid pipe 42 that is a metal pipe are inserted into the distal end hard portion 40 behind the endoscope cleaning nozzle. A tube 43 which is a fluid path constituting an air / water supply channel for supplying light source device fluid is connected to the base end portion of the fluid pipe 42. In addition, a tubular member 45 that covers the outer skin 44 of the insertion portion 11 is fitted on the proximal end of the distal end hard portion 40.

Here, the endoscope cleaning nozzle 50 according to the present embodiment will be described in detail below with reference to FIGS.
The endoscope cleaning nozzle 50 is formed of a metal such as stainless steel and is formed by a metal injection (MIM) manufacturing method, a die casting manufacturing method, machining, or the like. As shown in FIGS. A tubular portion 51 that is inserted into and fixed or pinned therein, and an external block-shaped nozzle head 52 that is connected to the tubular portion 51 and is exposed and disposed on the distal end surface of the distal end portion 21. It is configured. On one side of the nozzle head 52, a nozzle opening 55 of a fluid ejection port that ejects fluid toward the surface of the observation window 34 of the tip 21 is formed.

  A stepped portion 53 that protrudes in a substantially disc shape in the circumferential direction of the tubular portion 51 is formed at a boundary portion where the tubular portion 51 and the nozzle head 52 are joined, and a nozzle opening 55 is formed from a part of the outer periphery of the stepped portion 53. Convex protrusions 54 that project toward the opening surface of the nozzle and constitute the nozzle-side positioning means are formed. The protrusion 54 is formed on the lower surface portion of the nozzle head 52 that is positioned immediately below the periphery of the tubular portion 51 where the nozzle opening 55 of the nozzle head 52 is formed.

  As shown in FIG. 6, the projection 54 includes a first surface 54a parallel to the opening surface of the nozzle opening 55 and a second axis around the longitudinal axis of the tubular portion 51 different from the first surface 54a. It has the surface 54b and the 3rd surface 54c around the longitudinal axis of the tubular part 51 different from the 1st surface 54a and the 2nd surface 54b. Here, the protrusion 54 has a second surface 54b and a third surface 54c orthogonal to the first surface 54a, and the second surface 54b and the third surface 54c are parallel to each other. It has a shape with a smooth surface.

  As shown in FIGS. 7 and 8, the tip cover 30 fixed to the tip hard portion 40 is formed with a fitting hole portion 38 constituting an accommodation hole portion into which the tubular portion is inserted and fixed. . The fitting hole 38 has a concave fitting groove 39 that constitutes positioning means on the distal end side from a part of the outer periphery of the circular hole toward the observation window 34.

  The cross-sectional shape of the fitting groove 39 includes a first surface 39a orthogonal to a line a connecting the center O1 of the observation window 34 and the center O2 of the fitting hole 38 as the wall surface of the tip cover 30, and the first surface 39a. A second surface 39b around the center O2 different from the first surface 39a, and a third surface 39c around the center O2 different from the first surface 39a and the second surface 39b. Here, the fitting groove 39 has a second surface 39b and a third surface 39c orthogonal to the first surface 39a, and the second surface 39b and the third surface 39c are It is formed from the wall surface of the tip cover 30 as a shape having parallel surfaces.

  The fitting hole portion 38 has a hole diameter dimension and a depth direction dimension that are substantially the same as the diameter dimension and the thickness dimension of the stepped portion 53 of the endoscope cleaning nozzle 50, and is substantially the same as the stepped portion 53. It is a part shape. Further, the fitting groove 39 has a groove portion shape that is substantially the same as the protrusion portion 54, with the outer shape and the dimension in the depth direction substantially matching the protrusion shape and thickness dimension of the protrusion portion 54.

  As described above, the tubular portion 51 is inserted into the distal end hard portion 40 from the fitting hole portion 38 formed in the distal end cover 30 when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21. Is done. At this time, in the endoscope cleaning nozzle 50, the outer peripheral surface of the stepped portion 53 is in surface contact with the inner peripheral surface forming the fitting hole portion 38 of the tip cover 30, and the first to third surfaces of the protruding portion 54. 54a to 54c are fitted so as to come into surface contact with the first to third surfaces 39a to 39c forming the fitting groove 39 facing each other, and are positioned in a predetermined direction.

  When the endoscope cleaning nozzle 50 is positioned in a predetermined direction as described above, the opening surface of the nozzle opening 55 provided in the nozzle head 52 is reliably positioned in a direction facing the center O1 of the observation window 34. It becomes a state. In other words, in the endoscope cleaning nozzle 50, the projection 54 is fitted into the fitting groove 39, so that the opening surface of the nozzle opening 55 is the center O1 of the observation window 34 and the center of the fitting hole 38. Arranged perpendicular to the line a connecting O2. Thereby, the jet direction of the fluid from the nozzle opening 55 is defined in the direction along the line a toward the center O1 of the observation window 34. The fluid ejected from the nozzle opening 55 defines the ejection direction along the line a.

  In the endoscope 2 of the present embodiment having such a configuration, when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21, the nozzle opening 55 that is a fluid ejection port is positioned at the center of the observation window 34. The position can be easily determined without adjusting the position toward O1, and the assemblability can be improved. As a result, the endoscope 2 has a configuration having a cleaning performance of the observation window 34 in which the fluid from the nozzle opening 55 of the endoscope cleaning nozzle 50 is reliably and stably ejected toward the observation window 34. Become.

  Further, as described above, the projection 54 of the endoscope cleaning nozzle 50 is provided in the vicinity of the nozzle opening 55 of the nozzle head 52 and is formed on the lower surface of the nozzle head 52 immediately below the nozzle opening 55. ing. With this configuration, when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21, the opening surface of the nozzle opening portion 55 is stably within a tolerance range in the direction facing the center O1 side of the observation window 34. There is an advantage that positioning can be performed.

  Further, as described above, the configuration in which the fitting hole 38 and the fitting groove 39 are formed in the tip cover 30 is exemplified, but of course, the thickness of the stepped portion 53 and the protruding portion 54 is increased and the depth direction is increased. The fitting hole 38 and the fitting groove 39 may be formed up to the metal tip hard part 40.

  In the present embodiment, the outer peripheral surface of the stepped portion 53 on the endoscope cleaning nozzle 50 side and the three surfaces of the first to third surfaces 54a to 54c of the projection 54 are the fitting holes of the tip cover 30. The configuration in which the attachment direction of the endoscope cleaning nozzle 50 to the distal end portion 21 is positioned by making surface contact with the inner peripheral surface of the portion 38 and the first to third surfaces 39a to 39c of the fitting groove 39, respectively. However, even if at least any two different surfaces are brought into surface contact, the positioning that defines the mounting direction of the endoscope cleaning nozzle 50 to the distal end portion 21 can be performed. Moreover, although each said surface 54a-54c, 39a-39c in drawing is made into a plane, it is not limited to this, Any surface, such as a curved surface, may be sufficient.

(Second Embodiment)
Next, a second embodiment according to the endoscope 2 of the present invention will be described below based on FIGS. FIGS. 9 to 13 relate to the second embodiment of the present invention, FIG. 9 is a side view showing the configuration of the endoscope cleaning nozzle, and FIG. 10 shows the configuration of the endoscope cleaning nozzle. FIG. 11 is a cross-sectional view taken along the line XI of FIG. 10, FIG. 12 is a cross-sectional view taken along the line XII-XII of FIG. 10, and FIG. 13 is a plan view showing the configuration of the fitting hole formed at the tip.
Moreover, in the following description, the same code | symbol is used about the component of the endoscope 2 of 1st Embodiment mentioned above, and detailed description of these components is abbreviate | omitted.

  Here, the endoscope cleaning nozzle 50 is exemplified by a configuration in which an injection molded product obtained by mixing stainless metal powder and a resin binder is processed and molded by a metal injection (MIM) manufacturing method for degreasing / sintering. As will be described, of course, it may be formed by die casting, machining, or the like.

  As shown in FIGS. 9 and 10, the tubular portion 51 of the endoscope cleaning nozzle 50 according to the present embodiment includes a pinning recess 56 for fixing to the distal end hard portion 40 at the outer peripheral portion, and a mold. A recess 57 is formed in which an injection port serving as a gate of a material at the time of injection molding is disposed in a flat portion.

As shown in FIGS. 11 and 12, the tubular portion 51 has an outer shape that is not a perfect circle but an asymmetric shape with respect to a line segment passing through the center.
Specifically, the tubular portion 51 includes a first surface 51a parallel to the opening surface of the nozzle opening 55 of the nozzle head 52, and a second surface 51b around a longitudinal axis different from the first surface 51a. And a third surface 51c around a longitudinal axis different from the first surface 51a and the second surface 51b. Here, the tubular portion 51 is such that the first surface 51a and the second surface 51b are parallel to each other, and the third surface 51c is relative to the first surface 51a and the second surface 51b. It has a cross-sectional shape that is orthogonal to the longitudinal direction and the other surfaces are curved.

  In addition, the endoscope cleaning nozzle 50 has an elongated flat shape in which the hole cross section gradually changes from a substantially circular shape to an elliptical shape, and both end portions are arc-shaped from the tubular portion 51 toward the nozzle head 52. A flow path 60 that is continuously and smoothly deformed without a step is formed inside.

As shown in FIG. 13, the tubular portion 51 is inserted into the distal end cover 30 and the distal end rigid portion 40 in accordance with the cross-sectional shape orthogonal to the longitudinal axis of the tubular portion 51 of the endoscope cleaning nozzle 50 described above. A fitting hole 61 is formed.
The cross-sectional shape orthogonal to the hole axis of the fitting hole 61 is a first wall orthogonal to a line b connecting the center O1 of the observation window 34 and the center O3 of the tubular portion 51 as the wall surfaces of the tip cover 30 and the tip hard portion 40. The first surface 61a, the second surface 61b in the plane around the longitudinal axis different from the first surface 61a, and the first surface 61a and the second surface 61b in the first axis around the longitudinal axis different from each other. 3 surfaces 61c. In addition, the fitting hole part 61 here is a surface in which the first surface 61a and the second surface 61b are parallel, and the third surface 61c is formed on the first surface 61a and the second surface 61b. The distal end cover 30 and the distal end hard portion 40 are formed by the wall surfaces of the distal end cover 30 and the distal end rigid portion 40 so as to have a cross-sectional shape perpendicular to the hole axis that is substantially the same shape as the curved tubular portion 51. Yes.

  And the fitting hole part 61 is formed in the above-mentioned cross-sectional shape over the full length of the depth dimension of the front-end | tip hard part 40 by which the washing | cleaning nozzle 50 for endoscopes is penetrated and arrange | positioned. That is, the fitting hole 61 formed in the distal end hard portion 40 from the distal end cover 30 is a hole having substantially the same shape as the outer shape of the tubular portion 51 of the endoscope cleaning nozzle 50.

  With the configuration as described above, the tubular portion 51 is inserted into the distal end hard portion 40 from the fitting hole portion 61 formed in the distal end cover 30 when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21. And pinned. At this time, the endoscope cleaning nozzle 50 is in surface contact with the inner surface of the distal end cover 30 and the distal end hard portion 40 that form the fitting hole portion 61 facing the outer surface of the tubular portion 51. That is, the endoscope cleaning nozzle 50 is in surface contact with the first to third surfaces 61a to 61c that form the fitting hole portions 61 that the first to third surfaces 51a to 51c of the tubular portion 51 face each other. Are fitted and positioned in a predetermined direction.

  Also in the present embodiment, the endoscope cleaning nozzle 50 is positioned in a direction in which the opening surface of the nozzle opening 55 provided in the nozzle head 52 faces the center O1 of the observation window 34. In other words, in the endoscope cleaning nozzle 50, the tubular portion 51 is fitted into the fitting hole portion 61, so that the opening surface of the nozzle opening 55 is the center O 1 of the observation window 34 and the flow path of the tubular portion 51. It is arranged orthogonal to a line b connecting 60 centers O3. Thereby, the jet direction of the fluid from the nozzle opening 55 is defined in the direction along the line b toward the center O1 of the observation window 34.

  Even with such a configuration, the endoscope 2 according to the present embodiment can be cleaned when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21 as in the first embodiment. The tubular portion 51 of the nozzle 50 serves as nozzle-side positioning means, and the fitting hole portion 61 set in a cross-sectional shape that matches the cross-sectional shape of the tubular portion 51 serves as a positioning means on the distal end portion 21 side, which is a nozzle serving as a jet outlet. The opening 55 is easily positioned without adjusting the position toward the center O1 of the observation window 34, and the assembling property is improved.

  In addition, although the cross-sectional shape mentioned above of the fitting hole part 61 is preferably formed in the full length of the depth dimension in which the endoscope cleaning nozzle 50 is inserted and arranged in the distal end hard part 40, the first As described in the embodiment, when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21, the opening surface of the nozzle opening 55 falls within the tolerance range in the direction facing the center O1 side of the observation window 34. It is sufficient if stable positioning can be performed. Therefore, the cross-sectional shape of the fitting hole 61 that matches the cross-sectional shape of the tubular portion 51 of the endoscope cleaning nozzle 50 is formed only on the tip cover 30 or only near the end surfaces of the tip cover 30 and the tip hard portion 40. Also good.

(Third embodiment)
Next, a third embodiment according to the endoscope 2 of the present invention will be described below with reference to FIGS. 14 and 15. 14 and 15 relate to a third embodiment of the present invention, FIG. 14 is a plan view showing an observation window and a nozzle head, FIG. 15 shows a modification, and (a) is for an endoscope. The front view which shows the structure of a washing nozzle is shown, (b) is an enlarged view of a circle part.
Also in the following description, the same reference numerals are used for the components of the endoscope 2 of the first embodiment described above, and detailed description of these components is omitted.

  In the present embodiment, as shown in FIG. 14, the positioning is performed at the center of the upper surface of the nozzle head 52 so that the nozzle opening 55 of the endoscope cleaning nozzle 50 faces the center O1 side of the observation window 34. A linear indicator portion 52a serving as a means is provided. The indicator portion 52 a is a line in a direction orthogonal to the opening surface of the ejection port 55 of the nozzle head 52. That is, the axis alignment can be easily performed when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21 so that the direction in which the fluid is ejected from the nozzle opening 55 is directed toward the center O1 of the observation window 34. It becomes like this.

  The linear indicator portion 52a may be formed by painting on the upper surface of the nozzle head 52, or when the endoscope cleaning nozzle 50 is molded by a metal injection (MIM) manufacturing method, the parting line (on the mold matching surface) As the generated linear streaks, the mold may be divided so as to be positioned at the center of the upper surface of the nozzle head 52.

  Furthermore, as shown in FIG. 15, it is good also as the parameter | index part 52b projected straightly along the center of the upper surface of the nozzle head 52. As shown in FIG. Such a convex indicator portion 52b can be formed by performing a metal injection (MIM) manufacturing method, a die casting manufacturing method, machining, or the like on the endoscope cleaning nozzle 50.

  Even with such a configuration, the endoscope 2 according to the present embodiment is linear or convex when the endoscope cleaning nozzle 50 is assembled to the distal end portion 21 as in the above embodiments. By adjusting the nozzle head 52 around the axis of the tubular portion 51 so that the center O1 of the observation window 34 is positioned on the extended line of the indicator portions 52a and 52b, positioning can be easily performed in a predetermined direction, and assemblability is improved. It becomes the composition to do.

  Although the tubular portion 51 here is not illustrated, it has a perfect circular tube shape, and the nozzle head 52 rotates around the axis of the tubular portion 51 before being fixed to the distal end portion 21. It has become. Moreover, you may form index part 52a, 52b in the nozzle head 52 of the washing | cleaning nozzle 50 for endoscopes of each embodiment mentioned above.

  The invention described in the above embodiment is not limited to the embodiment and modifications, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the stated problem can be solved and the stated effect can be obtained, this constituent requirement is deleted. The structure can be extracted as an invention.

DESCRIPTION OF SYMBOLS 1 ... Endoscope system 2 ... Endoscope 5 ... Light source device 6 ... Video processor 7 ... Monitor 11 ... Insertion part 21 ... Tip part 22 ... Bending part 25 ... Treatment instrument insertion port 30 ... Tip cover 34 ... Observation window 35 ... Objective lens 37 ... Imaging unit 38 ... Fitting hole 39 ... Fitting groove 39a, 51a, 54a, 61a ... First surface 39b, 51b, 54b, 61b ... Second surface 39c, 51c, 54c, 61c ... First 3 surface 40 ... hard tip portion 42 ... fluid pipe 43 ... tube 50 ... endoscope cleaning nozzle 51 ... tubular portion 52 ... nozzle head 52a ... indicator portion 52a, 52b ... indicator portion 52b ... indicator portion 53 ... step portion 54 ... Projection 55 ... Nozzle opening 61 ... Fitting hole

Claims (9)

An endoscope comprising a cleaning nozzle that ejects fluid toward the surface of an observation window disposed at the distal end of the insertion portion,
A tubular portion that is disposed in the cleaning nozzle and includes a flow path through which the fluid flows from a fluid path disposed in the insertion portion;
A nozzle head provided continuously with the tubular portion, and provided with a spout for ejecting the fluid to the observation window;
An accommodation hole which is disposed at the distal end and is fixed by inserting and fitting the tubular portion;
A position around the longitudinal axis of the tubular portion is defined so that the nozzle is disposed in at least one of the cleaning nozzle and the receiving hole and the nozzle outlet of the nozzle head faces a predetermined direction toward the observation window. Positioning means;
An endoscope comprising:   In a state where the tubular portion is inserted into the receiving hole, at least two surfaces in different surfaces provided in the cleaning nozzle and at least two surfaces in different surfaces of the tip portion forming the receiving hole are The endoscope according to claim 1, wherein the positioning unit is configured so as to face each other and face each other.   The positioning means is formed by a projection part formed at a boundary part where the tubular part and the nozzle head are joined and projecting from a part of the outer periphery of the tubular part and a fitting groove into which the projection part formed in the housing part fits. The endoscope according to claim 1, wherein the endoscope is configured.   The positioning means has a cross-sectional shape orthogonal to the longitudinal axis asymmetrical to a line segment passing through the center of the tubular portion, and the hole cross-section orthogonal to the hole axis of the receiving hole portion is substantially matched with the cross-sectional shape of the tubular portion. The endoscope according to claim 1, wherein the endoscope is configured.   The endoscope according to any one of claims 1 to 4, wherein the positioning means is arranged in a portion directly below the ejection port.   The endoscope according to any one of claims 1 to 5, wherein an indicator portion is disposed on the nozzle head so that the jet port faces the predetermined direction.   The endoscope according to claim 6, wherein the linear or convex indicator portion is disposed at the center of the upper surface of the nozzle head. An endoscope cleaning nozzle that jets and cleans fluid toward the observation window surface disposed at the distal end of the endoscope,
A tubular portion provided with a flow path through which the fluid flows from a fluid path disposed and fixed to the distal end portion and disposed in the insertion portion of the endoscope;
A nozzle head provided continuously with the tubular portion, and provided with a spout for ejecting the fluid to the observation window;
An indicator portion that is disposed in the nozzle head and defines a position around the longitudinal axis of the tubular portion such that the jet port faces a predetermined direction toward the observation window;
An endoscope cleaning nozzle comprising:   The endoscope cleaning nozzle according to claim 8, wherein the linear or convex indicator portion is disposed at the center of the upper surface of the nozzle head.

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