JP2010119569A - Nozzle mounting structure of endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To compatibly attain the improvement in working efficiency when mounting a nozzle, and the improvement in a retaining property of the nozzle in the mounted state, in a structure for mounting the fluid delivery nozzle to a nozzle support hole at the distal end of an insertion section of an endoscope. <P>SOLUTION: In this nozzle mounting structure of the endoscope, the fluid delivery nozzle includes: a head section having a fluid delivery outlet; the tubular insertion section extending from the head section and being inserted in the nozzle support hole; and an external-diameter protrusion section formed at a partial area in the axial direction of the tubular insertion section, protruding from the peripheral face of the tubular insertion section so that its diameter becomes larger than the internal diameter of the nozzle support hole and being inserted in the nozzle support hole along with the tubular insertion section. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mounting structure for a fluid delivery nozzle provided at the distal end of an insertion portion of an endoscope.

  An example of a nozzle mounting structure for the distal end of the insertion portion of the endoscope is shown in FIGS. FIG. 15 is a front view of the distal end of the insertion portion 10 of the endoscope. On the end surface of the distal end member 11 constituting the distal end of the insertion portion, an observation window 12, two illumination windows 13, and a forceps port 14 are provided. Is arranged. The forceps port 14 is an opening located at the tip of a forceps channel (not shown), and the observation window 12 and the illumination window 13 are optical members having translucency. As shown in FIGS. 17 and 18, an objective optical system 15 composed of a plurality of lens groups is provided behind the observation window 12 in the tip member 11. The subject light incident through the observation window 12 forms an image on the light receiving surface of the image sensor 16 by the objective optical system 15 and generates a photoelectrically converted image signal. In the case of an optical endoscope instead of an electronic endoscope using such an image sensor, an image guide is provided instead of the image sensor, and an image is observed via the eye guide via the image guide. Although not shown, a light guide that guides illumination light that continues from the light source device to the illumination window 13 is provided, and illumination light can be emitted toward the observation target through the illumination window 13.

  A water supply nozzle 20 and an air supply nozzle 21 are further provided at the distal end of the insertion portion 10. The water supply nozzle 20 functions as a washing water ejection port for removing dirt adhering to the observation window 12, and the water supply route is configured as follows. The tip member 11 is formed with a nozzle support hole 22 and an intermediate pipe portion (fluid flow passage) 23 that follows the nozzle support hole 22, and communicates with the intermediate pipe portion 23 to end the water supply pipe passage (fluid flow passage) 24. The part is fixed. The water supply conduit 24 is passed through the flexible tube portion of the endoscope and connected to a water supply device (not shown). The nozzle support hole 22 is a hole having a circular cross section having a larger inner diameter than the intermediate pipe line portion 23. As shown in FIG. 16, the water supply nozzle 20 has a cylindrical insertion portion 25 and a large-diameter head portion 26 positioned at one end portion (upper end portion) of the cylindrical insertion portion 25, and a side surface of the head portion 26. A flow path space 28 is formed which communicates from the water supply opening 27 provided to the other end (lower end) of the cylindrical insertion portion 25.

  The cylindrical insertion portion 25 of the water supply nozzle 20 has a diameter size that fits the nozzle support hole 22 of the tip member 11, and when the water supply nozzle 20 is attached, as shown by the arrow in FIG. A cylindrical insertion portion 25 is inserted into 22. As shown in FIG. 18, when the water supply nozzle 20 is inserted until the head portion 26 comes into contact with the end surface of the tip member 11, only the head portion 26 appears in the appearance. Then, the angle of the water supply nozzle 20 is adjusted as appropriate so that the water supply opening 27 correctly faces the center of the observation window 12. When mounting the water supply nozzle 20 as described above, an adhesive is applied to the inner surface of the nozzle support hole 22 or the outer surface of the cylindrical insertion portion 25, and the water supply nozzle 20 inserted into the nozzle support hole 22 is fixed to the tip member 11. Is done.

  Although detailed illustration is omitted, the air supply nozzle 21 is supported by the tip member 11 by the same structure as the water supply nozzle 20 and functions as an air supply outlet from the air supply device. The opening of the air supply nozzle 21 faces the observation window 12, and after the observation window 12 is washed by the washing water jet from the water supply nozzle 20, water droplets are blown off by the air supply from the air supply nozzle 21, thereby providing a good observation field of view. Can be secured. Further, the air supply from the air supply nozzle 21 can inflate an organ such as the stomach into which the endoscope is inserted.

As a nozzle mounting structure other than adhesion, Patent Document 1 describes a structure in which a nozzle is screwed to the distal end of an endoscope insertion portion. In Patent Document 2, the nozzle insertion portion is formed to have a larger diameter as a whole than the nozzle support hole formed at the distal end of the endoscope insertion portion, and the nozzle is fixed by press-fitting the insertion portion with the large diameter. The structure to be described is described (for example, FIG. 23).
Japanese Patent Laid-Open No. 11-197095 JP-A-8-215137

  With a nozzle mounting structure that uses only an adhesive, there is a risk that the nozzle may easily fall off due to peeling of the adhesive or a decrease in adhesive force due to poor adhesion during manufacturing, external impact, repeated cleaning, deterioration over time, etc. There is. In particular, in a medical endoscope that requires strict safety, there should be no dropout of the nozzle in use.

  In addition, the nozzle mounting structure by screwing in Patent Document 1 has a problem that the structure is complicated and it takes time and effort to install, and it is necessary to consider ensuring water tightness at the screw portion.

  Further, in the nozzle mounting structure of Patent Document 2, the entire insertion portion of the nozzle with respect to the nozzle support hole has a uniform outer diameter size, and frictional engagement between the outer peripheral surface of the insertion portion and the inner peripheral surface of the nozzle support hole This prevents the nozzle from coming off. In the case of such a retaining structure by frictional engagement of the entire opposite peripheral surface part, the effect of preventing the nozzle from dropping is enhanced by increasing the contact surface pressure by forming the insertion part to have a large diameter, but the insertion part is set to be too large Then, resistance when press-fitting the nozzle is large, and workability is deteriorated. On the other hand, if the outer diameter size of the insertion portion of the nozzle is set to be small in order to improve the insertion workability, the holding force in the press-fitted state is weakened and it is easy to drop off.

  It is an object of the present invention to provide a nozzle mounting structure that is excellent in both the mounting workability of a fluid delivery nozzle to the distal end of an insertion portion of an endoscope and the ability of preventing the nozzle from dropping in the mounted state.

  The present invention relates to a structure in which a nozzle for fluid delivery is inserted and supported in a nozzle support hole having a circular cross section formed in communication with a fluid flow passage at the distal end of an insertion portion of an endoscope. A cylindrical insertion portion that extends from the head and is inserted into the nozzle support hole, and is formed in a partial region in the axial direction of the cylindrical insertion portion. It protrudes from the outer peripheral surface so as to have a larger diameter than the inner diameter of the nozzle support hole, and has an outer diameter protruding portion inserted into the nozzle support hole together with the cylindrical insertion portion.

  By setting the outer diameter of the cylindrical insertion portion excluding the outer diameter protruding portion to be substantially the same as the inner diameter of the nozzle support hole, it is possible to obtain stable nozzle retention while reducing the insertion resistance when inserting the nozzle. it can.

  Moreover, a higher retaining effect can be obtained by causing the adhesive to flow into the protruding portion passage space formed by inserting the outer diameter protruding portion into the nozzle support hole.

  As an aspect of the outer diameter protruding portion provided in the nozzle, the cylindrical insertion portion can be surrounded in the circumferential direction, and the outer diameter size can be formed as an annular flange larger than the inner diameter size of the nozzle support hole.

  In this case, the annular flange preferably has a conical outer surface that gradually decreases in outer diameter size as it proceeds from the nozzle head side toward the tip end side of the cylindrical insertion portion. Thereby, it becomes easy to insert a nozzle with respect to a nozzle support hole, providing a large diameter annular flange. In addition, the surface of the annular flange facing the head side of the nozzle is an annular plane that is substantially orthogonal to the axis of the cylindrical insertion portion, or a conical inner surface that gradually increases in inner diameter size as it approaches the head. Thus, the effect of making it difficult to remove the nozzle after insertion can be obtained.

  Or you may comprise an annular flange as a fixed diameter protrusion part with the constant outer diameter size.

  As a different aspect of the outer diameter protrusion provided on the nozzle, a partial protrusion that exists only in a part in the circumferential direction of the cylindrical insertion portion can be used.

  In this case, the partial projection is provided with a partial projection by providing a tapered outer surface that gradually decreases the projection amount from the cylindrical insertion portion as it proceeds from the head side of the nozzle to the tip end side of the cylindrical insertion portion. It becomes easy to insert the nozzle into the nozzle support hole. Further, the surface of the partial projection facing the head side of the nozzle is gradually separated from the axis orthogonal plane substantially orthogonal to the axis of the cylindrical insertion portion or gradually from the outer peripheral surface of the cylindrical insertion portion as the head is approached. By using the tapered inner surface, an effect of making it difficult to remove the nozzle after insertion can be obtained.

  A plurality of partial protrusions may be provided at different positions in the circumferential direction of the cylindrical insertion portion.

  Further, in the aspect in which the nozzle includes the partial protrusion, it is preferable that the nozzle is inserted in the axial direction of the cylindrical insertion portion with respect to the nozzle support hole and then rotated in the circumferential direction so as to be retained. Thereby, a high retaining effect can be obtained.

  According to the present invention described above, the fluid delivery nozzle to be attached to the nozzle support hole at the distal end of the insertion portion of the endoscope is configured such that a part of the cylindrical insertion portion has a larger outer diameter than the other portion. With this configuration, it is possible to improve both the nozzle mounting workability with respect to the nozzle support hole and the nozzle falling-off preventing property in the mounted state.

  A first embodiment of a nozzle mounting structure to which the present invention is applied will be described with reference to FIGS. In addition, the insertion part 10 of the endoscope shown in FIGS. 1 and 2 is denoted by the same reference numerals for portions that are common to the portions described above in the prior art.

  The water supply nozzle (fluid delivery nozzle) 30 is formed of a material harder than the distal end member 11 of the endoscope insertion portion having the nozzle support hole 22. For example, the tip member 11 is made of synthetic resin, and the water supply nozzle 30 is made of metal. The water supply nozzle 30 includes a cylindrical insertion portion 31 having a constant outer diameter size and a large-diameter head portion 32 positioned at an end portion (upper end portion) of the cylindrical insertion portion 31. A flow path space 34 that communicates from the provided water supply opening (fluid delivery port) 33 to the other end (lower end) of the cylindrical insertion portion 31 is formed. A conical chamfered portion 35 is formed between the outer peripheral surface of the cylindrical insertion portion 31 and the distal end surface, and the outer diameter size is gradually reduced toward the distal end side.

  The water supply nozzle 30 is further formed with a retaining flange (outer diameter protruding portion, annular flange) 36 having an outer diameter larger than that of the cylindrical insertion portion 31 at an intermediate position in the axial direction of the cylindrical insertion portion 31. The retaining flange 36 is a projecting portion formed in an annular shape on the outer peripheral surface of the cylindrical insertion portion 31 so as to surround the cylindrical insertion portion 31 in the circumferential direction, as shown in FIG. 1 and FIG. The cross-sectional shape of the cylindrical insertion portion 31 in the axial direction is a wedge shape (triangular shape). More specifically, the retaining flange 36 rises from the outer peripheral surface of the cylindrical insertion portion 31 in an outer diameter direction (a direction substantially perpendicular to the axis of the cylindrical insertion portion 31) substantially perpendicularly to the head 32 side. A conical insertion guide surface (conical outer surface) 36b that gradually decreases the protruding amount in the outer diameter direction from the surface (annular plane) 36a and the axial orthogonal annular surface 36a side toward the distal end side of the cylindrical insertion portion 31. Have. The outer diameter size D1 of the cylindrical insertion portion 31 in the water supply nozzle 30 is substantially the same as the inner diameter size D3 of the circular nozzle support hole 22 in the tip member 11, and the outer diameter size D2 of the retaining flange 36 (more specifically, The outer diameter size of the boundary portion between the axial orthogonal annular surface 36a and the conical insertion guide surface 36b) is larger than the inner diameter size D3 of the nozzle support hole 22;

  When the water supply nozzle 30 is inserted into the nozzle support hole 22 as indicated by an arrow in FIG. 1, first, the distal end portion of the cylindrical insertion portion 31 enters the nozzle support hole 22. Since the cylindrical insertion portion 31 has substantially the same diameter as the nozzle support hole 22, the insertion resistance at this time is small. The cylindrical insertion portion 31 can be smoothly inserted without being caught by the opening edge portion E of the nozzle support hole 22 at the time of insertion due to the presence of the chamfered portion 35 formed on the distal end side.

  When the cylindrical insertion portion 31 is inserted to some extent, the retaining flange 36 reaches the opening of the nozzle support hole 22. Then, since the outer diameter size D 2 of the retaining flange 36 is larger than the inner diameter size D 3 of the nozzle support hole 22, the conical insertion guide surface 36 b of the retaining flange 36 contacts the opening edge portion E of the nozzle support hole 22. Stick. Here, since the water supply nozzle 30 is formed of a harder material than the tip member 11, when the water supply nozzle 30 is further pushed in the insertion direction, the conical insertion guide surface 36 b of the retaining flange 36 is formed in the nozzle support hole 22. The water supply nozzle 30 is press-fitted into the nozzle support hole 22 so as to expand the inner peripheral surface. Since the conical insertion guide surface 36b of the retaining flange 36 is a conical surface whose diameter decreases as it advances toward the distal end side of the cylindrical insertion portion 31, it can be smoothly press-fitted without being caught between the nozzle support holes 22. It can be carried out. The water supply nozzle 30 is inserted to a position where the head 32 abuts against the end surface of the tip member 11 as shown in FIG. As shown in an enlarged view in FIG. 3, in a state where the water supply nozzle 30 is press-fitted, a region through which the retaining flange 36 has passed is expanded in the nozzle support hole 22, and adhesion is made in the passage space of the retaining flange 36. Agent P flows in. The adhesive P can be injected after the water supply nozzle 30 is inserted. However, in consideration of workability, the inner peripheral surface of the nozzle support hole 22 and the cylindrical insertion portion 31 are inserted before the water supply nozzle 30 is inserted. It may be applied in advance to either or both of the outer peripheral surfaces.

  As described above, the water supply nozzle 30 attached in the nozzle support hole 22 has its claw-like retaining flange 36 hooked on the inner wall portion of the nozzle support hole 22, so that the dropout from the nozzle support hole 22 is restricted. Yes. Further, since the retaining flange 36 is engaged with the portion sealed with the adhesive P, the dropout is less likely to occur, and the water supply nozzle 30 can be firmly held. In particular, since it is the axis orthogonal ring-shaped surface 36a that faces the direction orthogonal to the axis of the cylindrical insertion portion 31 that hits the sealed portion by the adhesive P, the retaining effect is high. Note that even if the adhesive P is peeled off due to impact or vibration, the retaining flange 36 is kept in the hooked (press-fit) state with respect to the inner wall of the nozzle support hole 22, so that the water feeding nozzle 30 can be prevented from being accidentally dropped off. .

  As described above, the water supply nozzle 30 has a structure excellent in retainability in the state of being inserted into the nozzle support hole 22, and at the same time, can be easily inserted. In the structure in which the entire insertion portion of the nozzle is press-fitted with a large diameter as in Patent Document 2 described in the prior art, if the outer diameter of the insertion portion is too large, the insertion resistance becomes excessive and the assemblability deteriorates. However, according to the water supply nozzle of the present embodiment, even if the outer diameter size of the retaining flange 36 is increased to some extent, the formation region of the retaining flange 36 is a part of the cylindrical insertion portion 31, The resistance is small and the assembly is excellent. Further, the retaining flange 36 is guided by the conical insertion guide surface 36b having a tapered conical surface shape when being press-fitted into the nozzle support hole 22, so that it can be smoothly press-fitted without being caught.

  Next, different embodiments of the water blocking nozzle 30 retaining structure will be described. The retaining flange (outer diameter protruding portion, annular flange) 37 of the water supply nozzle 30 in the second embodiment shown in FIG. 5 is the conical insertion guide of the previous embodiment with respect to the conical insertion guide surface (conical outer surface) 37b. A conical retaining surface (conical inner surface) 37a that has the same shape as the surface 36b, but whose surface facing the head 32 has an inclination in the same direction as the conical insertion guide surface 37b (inclination angle is different). Is different. That is, the conical retaining surface 37 a is a conical inner surface that gradually increases in inner diameter size as it approaches the head 32 of the water supply nozzle 30. According to the retaining flange 37, a higher retaining effect can be obtained when the water supply nozzle 30 is inserted into the nozzle support hole 22.

  The retaining flange (outer diameter protruding portion, annular flange) 38 of the water supply nozzle 30 in the third embodiment shown in FIG. 6 is not a wedge-shaped cross-sectional shape like the retaining flanges 36 and 37 of the previous embodiments. It is formed as a constant-diameter protrusion having a constant outer diameter. More specifically, the retaining flange 38 is an axially orthogonal annular surface 38a, 38b whose surfaces in the front-rear direction of insertion are substantially orthogonal to the axis of the cylindrical insertion portion 31, and these axially orthogonal annular surfaces 38a, 38b are formed into cylinders. It has a rectangular cross-sectional shape connected by a constant-diameter cylindrical outer surface 38c in a direction parallel to the axis of the cylindrical insertion portion 31. The retaining flange 38 has a smaller outer diameter (amount of protrusion in the outer diameter direction) than the retaining flanges 36 and 37 having a tapered shape in order to suppress resistance during press-fitting into the nozzle support hole 22. Is set.

  In the first, second, and third embodiments described above, the retaining flanges 36, 37, and 38 are formed near the center of the cylindrical insertion portion 31 in the axial direction, but the formation position is limited to this. Instead, it can be provided at an arbitrary position. The fourth embodiment shown in FIG. 7 shows an example, and a retaining flange (outer diameter protruding portion, annular flange) 39 is formed at a position near the tip of the cylindrical insertion portion 31. The retaining flange 39 has the same cross-sectional shape as the retaining flange 36 of the first embodiment, but it is needless to say that other cross-sectional shapes can be selected. It is also possible to form a plurality of retaining flanges by changing the position in the axial direction of the cylindrical insertion portion 31.

  Further, in the above first to fourth embodiments, the retaining flanges 36, 37, 38 and 39 which are annular projecting portions over the entire circumferential direction of the cylindrical insertion portion 31 are provided. As shown in FIG. 10, it is also possible to provide a partial protrusion (prevention protrusion) that exists only in a part in the circumferential direction as a large-diameter portion on the cylindrical insertion portion 31 of the water supply nozzle 30.

  The retaining protrusion (outer diameter protrusion, partial protrusion) 40 provided on the water supply nozzle 30 of the fifth embodiment shown in FIG. 8 faces the head 32 and is orthogonal to the axis of the cylindrical insertion portion 31. The flat surface 40a and the taper insertion guide surface that gradually decreases the amount of protrusion in the outer diameter direction (approaching the outer peripheral surface of the cylindrical insertion portion 31) from the axis orthogonal plane 40a to the distal end side of the cylindrical insertion portion 31. (Tapered outer surface) 40b and a pair of tapered side surfaces (tapered outer surface) 40c which connect the axis orthogonal plane 40a and the tapered surface 40b and narrow each other as it protrudes in the outer diameter direction. Each tapered side surface 40c is inclined so as to gradually reduce the amount of protrusion in the outer diameter direction as it proceeds from the axis orthogonal plane 40a toward the distal end side of the cylindrical insertion portion 31 in the same manner as the tapered insertion guide surface 40b.

  The attachment method of the water supply nozzle 30 having the retaining protrusion 40 is shown in FIGS. 11 and 12 show a state in which the water supply nozzle 30 is inserted into the nozzle support hole 22 in the axial direction of the cylindrical insertion portion 31 until the head portion 32 comes into contact with the end surface of the tip member 11. The inner wall of the nozzle support hole 22 is expanded in the region where the retaining projection 40 has passed (the region where cross-hatching is applied to FIG. 11). When the water supply nozzle 30 is inserted in the axial direction, the retaining protrusion 40 can be smoothly press-fitted with a relatively small resistance due to the inclined shape of the tapered insertion guide surface 40b and the tapered side surface 40c. Subsequently, as shown in FIGS. 13 and 14, the water supply nozzle 30 in the inserted state is rotated in the nozzle support hole 22. Then, the retaining projection 40 changes the circumferential position with respect to the nozzle support hole 22, and the inner wall of the nozzle support hole 22 expands in the circumferential region where the retaining projection 40 passes at this time, as in the axial insertion. It is done. When the water supply nozzle 30 is rotated, the retaining protrusion 40 in the press-fitted state can be smoothly moved by the tapered shape of the tapered side surface 40c.

  By rotating the water supply nozzle 30 after insertion in the axial direction, as shown in FIG. 13, the axial orthogonal plane 40 a side (the direction of detachment from the nozzle support hole 22) of the retaining protrusion 40 is blocked by the flesh of the tip member 11. Since it is in a peeled state, the removal of the retaining protrusion 40 from the nozzle support hole 22 is restricted. Therefore, even if the retaining protrusion 40 is smaller than the annular flange, a high retaining effect can be obtained. Furthermore, by allowing the adhesive P (FIG. 14) to flow into the region through which the retaining protrusion 40 has passed during insertion and rotation of the water supply nozzle 30, the movement of the retaining protrusion 40 is restricted and a higher retaining effect is obtained. Can do. As in the first embodiment, the adhesive P can be injected after the water supply nozzle 30 is inserted. However, from the viewpoint of workability, prior to the insertion of the water supply nozzle 30, the adhesive P is formed in the nozzle support hole 22. It is good to apply in advance to either the inner peripheral surface, the outer peripheral surface of the cylindrical insertion portion 31, or both. In FIGS. 13 and 14, the water supply nozzle 30 is inserted and rotated about 90 degrees, but the size of the rotation angle can be arbitrarily set.

  A retaining protrusion (outer diameter protrusion, partial protrusion) 41 provided on the water supply nozzle 30 of the sixth embodiment shown in FIG. 9 is inserted into the stopper protrusion 40 in the same manner as the tapered insertion guide surface 40b and the pair of tapered side surfaces 40c. It has a guide surface (tapered outer surface) 41b and a pair of tapered side surfaces (tapered outer surface) 41c, and the surface facing toward the head 32 has an inclination in the same direction as the taper insertion guide surface 41b (inclination angle is different). A taper retaining surface (taper inner surface) 41a is formed. That is, the taper retaining surface 41a has an inclination that gradually separates from the outer peripheral surface of the cylindrical insertion portion 31 as it approaches the head portion 32 of the water supply nozzle 30, and according to the retaining projection 41 having this tapered retaining surface 41a, When the water supply nozzle 30 is inserted into the nozzle support hole 22, a higher retaining effect can be obtained.

  In the fifth and sixth embodiments shown in FIGS. 8 and 9, one retaining projection 40, 41 is formed at the approximate center in the axial direction of the cylindrical insertion portion 31. The number can be set arbitrarily. The water supply nozzle 30 of the seventh embodiment shown in FIG. 10 shows an example thereof, and two retaining protrusions (outer diameter protruding portions) are formed at different positions in the circumferential direction at positions near the distal end portion of the cylindrical insertion portion 31. , Partial protrusions) 42 are formed. The two retaining protrusions 42 have the same shape as the retaining protrusion 40 in FIG. 8, but it is of course possible to select other shapes. In FIG. 10, two retaining projections 42 are provided at substantially the same position in the axial direction of the cylindrical insertion portion 31, but two (or three or more) retaining projections are provided at different axial positions. It is also possible.

  Also in the water supply nozzle 30 of the sixth embodiment shown in FIG. 9 and the water supply nozzle 30 of the seventh embodiment shown in FIG. 10, as shown in FIGS. 11 to 14, the axial direction with respect to the nozzle support hole 22. After being inserted into the housing, it is prevented from coming off by rotating in the circumferential direction. By this rotation, the back of the retaining protrusions 41 and 42 (in the direction of detachment from the nozzle support hole 22) is blocked by the flesh of the tip member 11, and the retaining protrusions 41 and 42 are removed from the nozzle support hole 22. Is regulated.

  As described above, according to the nozzle mounting structure of each embodiment to which the present invention is applied, both the mounting workability of the water supply nozzle 30 and the drop-off preventing property in the mounting state are excellent. In addition, the nozzle support hole 22 on the endoscope insertion portion 10 side does not need to be specially modified, and has a structure that is simple and inexpensive.

  Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the illustrated embodiments, and can be improved and modified without departing from the gist of the invention. For example, in each embodiment, an example of application to the water supply nozzle 30 has been shown. However, the present invention can be widely applied as long as it is a fluid delivery nozzle. For example, the present invention can also be applied as a mounting structure of the air supply nozzle 21 in FIG. Is possible.

  In the water supply nozzle 30 of each embodiment, the maximum insertion position into the nozzle support hole 22 is regulated by the large-diameter head 32, but the tip of the cylindrical insertion portion 31 is located at the bottom of the nozzle support hole 22. The maximum insertion position of the nozzle may be regulated by a structure different from the embodiment, such as abutting. In this case, the head 32 does not need to have a larger diameter than the cylindrical insertion portion 31.

  Further, in the water supply nozzle 30 of each embodiment, the outer diameter protrusions (prevention flanges 36, 37, 38 and 39, prevention protrusions 40, 41, and 42) that protrude from the cylindrical insertion part 31 are provided to the nozzle support hole 22. However, these outer diameter protrusions may be inserted so as to scrape the inner wall of the nozzle support hole 22. Even in such an insertion mode with cutting, the water supply nozzle 30 is made to flow in the same manner as in the above-described embodiment by allowing the adhesive to flow into the space (the passing space of the outer diameter protrusion) cut by the outer diameter protrusion. Can be securely held.

  Further, in the water supply nozzle 30 of each embodiment, the outer diameter size D1 of the cylindrical insertion portion 31 is substantially the same as the inner diameter size D3 of the nozzle support hole 22, but does not hinder the mounting workability (the insertion resistance becomes too large). It is also possible to set a relationship of D1> D3 within a range. In this case, since the cylindrical insertion part 31 is also lightly press-fitted with respect to the nozzle support hole 22, the retainability of the water supply nozzle 30 can be improved.

The T1-T1 line in FIG. 15 shows a state before the water supply nozzle with a retaining flange (annular flange) of the first embodiment to which the present invention is applied is inserted into the nozzle support hole at the distal end of the insertion portion of the endoscope. It is sectional drawing of the insertion part vicinity of the endoscope of the position which follows. It is sectional drawing which shows the state which inserted the water supply nozzle with a retaining flange of FIG. 1 in the nozzle support hole. FIG. 3 is an enlarged cross-sectional view of the vicinity of a retaining flange in FIG. 2. It is a single-piece figure of the water supply nozzle with a retaining flange of 1st Embodiment in FIG. 1 thru | or 3, (A) is the perspective view seen from diagonally upward, (B) is the perspective view seen from diagonally downward, (C) FIG. 4 is a sectional view in the axial direction. FIG. 4 is a view showing a water supply nozzle of a second embodiment in which the shape of the retaining flange is different from FIG. 4, (A) is a perspective view seen from diagonally above, (B) is a perspective view seen from diagonally below, C) is a sectional view in the axial direction. 4 and 5 are views showing a water supply nozzle of a third embodiment in which the shape of the retaining flange is different, (A) is a perspective view seen from diagonally above, and (B) is a perspective view seen from diagonally below. FIG. 3C is a sectional view in the axial direction. It is the figure which showed the water supply nozzle of 4th Embodiment which varied the formation position of the retaining flange in an axial direction, (A) is the perspective view seen from diagonally upward, (B) is the perspective view seen from diagonally downward It is. It is the figure which showed the water supply nozzle of 5th Embodiment provided with the securing protrusion (partial protrusion) which exists partially in the circumferential direction instead of the annular retaining flange, and (A) is the perspective seen from diagonally upward FIG. 4B is a perspective view as seen from obliquely below with the circumferential angle changed. It is the figure which showed the water supply nozzle of 6th Embodiment from which the shape of a retaining protrusion differs from FIG. 8, (A) is a side view, (B) is the perspective view seen from diagonally downward, changing the angle of the circumferential direction. It is. FIG. 8 and FIG. 9 are views showing a water supply nozzle according to a seventh embodiment in which the number of retaining protrusions and the formation position in the axial direction are different, and (A) is a perspective view seen obliquely from above. ) Is a perspective view seen from obliquely below with the circumferential angle changed. FIG. 9 is a side view, partly in cross section, showing a state where the water supply nozzle with retaining protrusions of FIG. 8 is inserted in the axial direction with respect to the nozzle support hole. It is sectional drawing of the position which follows the T2-T2 line | wire of FIG. FIG. 12 is a side view, partly in section, showing a state where the water supply nozzle is rotated about 90 degrees from the state of FIG. 11. It is sectional drawing of the position which follows the T3-T3 line | wire of FIG. It is a front view which shows the front-end | tip of an endoscope insertion part. It is a single article perspective view which shows an example of the water supply nozzle attached to the front-end | tip of an insertion part by the conventional mounting structure. It is sectional drawing of the position along the T1-T1 line of FIG. 15 which shows the state before inserting the water supply nozzle of FIG. 16 in the nozzle support hole of the insertion part front-end | tip in the conventional nozzle mounting structure. It is sectional drawing of the position along the T1-T1 line of FIG. 15 which shows the state which inserted the water supply nozzle of FIG. 16 in the nozzle support hole of the insertion part front-end | tip in the conventional nozzle mounting structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Endoscope insertion part 11 Tip member 12 Observation window 13 Illumination window 14 Forceps port 15 Objective optical system 16 Imaging element 22 Nozzle support hole 23 Intermediate pipe line part (fluid flow path)
24 Water supply pipeline (fluid flow passage)
30 Water supply nozzle (fluid delivery nozzle)
31 Cylindrical insertion part 32 Head 33 Water supply opening (fluid delivery port)
34 Channel space 35 Chamfered portion 36 Stop flange (outer diameter protruding portion, annular flange)
36a Axis orthogonal plane (annular plane)
36b Conical insertion guide surface (conical outer surface)
37 Retaining flange (outside diameter protrusion, annular flange)
37a Conical retaining surface (conical inner surface)
37b Conical insertion guide surface (conical outer surface)
38 Retaining flange (outside diameter protrusion, annular flange)
38a 38b Axis orthogonal ring-shaped surface 38c Constant-diameter cylindrical outer surface 39 Retaining flange (outer diameter protrusion, annular flange)
40 Retaining protrusion (outside diameter protrusion, partial protrusion)
40a Axis orthogonal plane 40b Taper insertion guide surface (taper outer surface)
40c Tapered side surface (tapered outer surface)
41 Retaining protrusion (outside diameter protrusion, partial protrusion)
41a Taper retaining surface (taper inner surface)
41b Taper insertion guide surface (taper outer surface)
41c Tapered side surface (tapered outer surface)
42 Retaining protrusion (outside diameter protrusion, partial protrusion)
D1 Outer diameter size of cylindrical insertion portion of water supply nozzle D2 Outer diameter size of retaining flange of water supply nozzle D3 Inner diameter size of nozzle support hole E Open edge portion P of nozzle support hole Adhesive

Claims (14)

In a structure in which a nozzle for fluid delivery is inserted and supported with respect to a nozzle support hole having a circular cross section formed in communication with a fluid flow path at the distal end of an insertion portion of an endoscope,
The nozzle is
A head having a fluid delivery port;
A cylindrical insert extending from the head and inserted into the nozzle support hole;
It is formed in a partial region in the axial direction of the cylindrical insertion portion, protrudes from the outer peripheral surface of the cylindrical insertion portion so as to be larger in diameter than the inner diameter of the nozzle support hole, and together with the cylindrical insertion portion, the nozzle support hole An outer diameter protrusion inserted against the
An endoscope nozzle mounting structure characterized by comprising: 2. The endoscope nozzle mounting structure according to claim 1, wherein an outer diameter of the cylindrical insertion portion excluding the outer diameter protruding portion is substantially the same as an inner diameter of the nozzle support hole. Nozzle mounting structure. The endoscope mounting structure according to claim 1 or 2, wherein an adhesive is allowed to flow into a protruding portion passage space formed by inserting the outer diameter protruding portion into the nozzle support hole. Nozzle mounting structure. The endoscope nozzle mounting structure according to any one of claims 1 to 3, wherein the outer diameter protruding portion surrounds the cylindrical insertion portion in a circumferential direction, and an outer diameter size thereof is an inner diameter of the nozzle support hole. An endoscope nozzle mounting structure characterized by comprising an annular flange larger than the size. 5. The endoscope nozzle mounting structure according to claim 4, wherein the annular flange has a conical outer surface that gradually decreases in outer diameter size from the head side toward the distal end side of the cylindrical insertion portion. Endoscope nozzle mounting structure, characterized in that 6. The endoscope nozzle mounting structure according to claim 5, wherein a surface of the annular flange facing the head side is an annular flat surface substantially orthogonal to the axis of the cylindrical insertion portion. Endoscope nozzle mounting structure. 6. The endoscope nozzle mounting structure according to claim 5, wherein a surface of the annular flange facing the head side is a conical inner surface that gradually increases in inner diameter size as it approaches the head. Endoscope nozzle mounting structure. 5. The endoscope nozzle mounting structure according to claim 4, wherein the annular flange is a constant-diameter protruding portion having a constant outer diameter size. The endoscope nozzle mounting structure according to any one of claims 1 to 3, wherein the outer diameter protruding portion is a partial protrusion formed in a part of a circumferential direction of the cylindrical insertion portion. Endoscope nozzle mounting structure. 10. The endoscope nozzle mounting structure according to claim 9, wherein the partial projection is a taper that gradually reduces the amount of protrusion from the cylindrical insertion portion as it proceeds from the head side toward the distal end side of the cylindrical insertion portion. An endoscope nozzle mounting structure characterized by having an outer surface. The nozzle mounting structure for an endoscope according to claim 10, wherein a surface of the partial projection facing the head side is an axis orthogonal plane substantially orthogonal to the axis of the cylindrical insertion portion. Endoscope nozzle mounting structure. The nozzle mounting structure for an endoscope according to claim 10, wherein a surface of the partial projection facing the head side is a tapered inner surface that gradually separates from the outer peripheral surface of the cylindrical insertion portion as approaching the head. An endoscope nozzle mounting structure characterized by that. The endoscope nozzle mounting structure according to any one of claims 9 to 12, wherein a plurality of the partial protrusions are formed at different positions in the circumferential direction of the cylindrical insertion portion. Endoscope nozzle mounting structure. 14. The endoscope nozzle mounting structure according to claim 9, wherein the nozzle is inserted in the axial direction of the cylindrical insertion portion and then rotated in the circumferential direction with respect to the nozzle support hole. Endoscope nozzle mounting structure characterized in that it is in a retaining state.

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