JP2009261477A - Endoscope distal end part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain electric insulation between a nozzle and a distal end part body and to prevent the nozzle from coming off the distal end part even when a metal nozzle is used. <P>SOLUTION: The endoscope distal end part comprises: a first insulation member 21 made of a resin which is formed into a cylinder so as to encircle an outer periphery of a base body 20a of a metal nozzle 20 at a distal end part where the metal nozzle 20, that a recessed part G is formed at a bend part between the base body 20a and a jet part 20b, is arranged and in which a through-hole 20D and an end part opening 20E are formed on a cylinder wall surface; and engagement bodies (22e, d) engaged with the through-hole 20D and the end part opening 20E. A second insulation member 22 made of a resin that is equipped with a projection part 22T for preventing the nozzle from coming off is provided at the tip of the engagement bodies. After the base body 20a of the nozzle 20 is placed inside the first insulation member 21, both insulation members are connected so that the projection 22T of the second insulation member 22 is placed toward the recessed part G, so that the nozzle is prevented from coming off the projection part 22T. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides an endoscope tip, particularly a tip of a nozzle provided for air supply / water supply to the observation window in order to remove and wash body fluid, blood, dirt, etc. adhering to the observation window. It relates to the mounting structure.

  FIG. 7 shows a configuration of a distal end surface of a conventional endoscope distal end portion (the following Patent Document 1). In the endoscope distal end portion 1, as shown in FIG. 7, irradiation windows 2a and 2b are shown. The observation window 3, the resin nozzle 4 and the treatment instrument insertion channel 5 are provided. A light guide disposed in an endoscope is connected to the irradiation windows 2a and 2b, an objective optical system and an image sensor are connected to the observation window 3, and light from the light source passes through the light guide. By irradiating the object to be observed from the irradiation windows 2 a and 2 b, the illuminated object to be observed can be observed through the observation window 3.

  In addition, an air / water pipe is connected to the nozzle 4, and air / water from an air / water supply device can be executed on the observation window 3. For example, when body fluid, mucus, blood, filth, or the like adheres to the observation window 3, the body fluid or the like is washed away with water supply, and then the observation window 3 can be dried by supplying air. The treatment instrument insertion channel 5 is connected to the forceps opening of the operation unit, and the treatment instrument is led out from the distal end portion 1 through the treatment instrument insertion channel 5, and various treatments are performed by the treatment instrument. .

  FIG. 8 shows the mounting structure of the nozzle 4. As shown in the drawing, the base of the resin nozzle 4 (on the outlet of the air / water supply pipe 7 provided in the metal main body 6 is shown. After the cylindrical portion 4a is fitted, a screw 8 is screwed and inserted through a screw hole 6a provided on the side surface of the main body 6, and the base end portion of the nozzle 4 is fixed with the screw 8, so that the nozzle 4 It is attached to part 1. In addition, the resin cap 9 is put on the distal end surface of the distal end portion 1 after the attachment.

According to such a configuration of the distal end portion of the endoscope, the nozzle 4 is made of resin, and the resin cap 9 is covered, so that a predetermined gap is formed between the outer surface member of the distal end portion 1 and the internal metal main body 6. As a result, safety in using the electrical treatment instrument used via the treatment instrument insertion channel 5 is ensured.
Japanese Patent Laid-Open No. 11-244222 JP 2001-258825 A

  By the way, in the conventional endoscope front-end | tip part 1, as above-mentioned, instead of making nozzle 4 resin, it is also performed using this metal nozzle, and in the case of this metal nozzle, Since the nozzle is formed by bending the metal tube, there is an advantage that the flow of fluid ejection for air / water feeding becomes smooth as compared with the resin nozzle 4. That is, as can be seen from the cross section of the nozzle 4 in FIG. 8, since the injection portion 4b is bent in a right angle direction from the base 4a, a vortex or the like is generated in the inner or outer region E inside the right angle bent portion. While the flow is somewhat disturbed, the metal nozzle bends the metal tube, so that the inside (surface) of the bent portion is also streamlined and the jet flow is smooth.

  On the other hand, when the nozzle 4 configured as shown in FIGS. 7 and 8 is made of metal, the electrical insulation between the nozzle and the metal main body 6 cannot be maintained. Therefore, when a metal nozzle is conventionally used, for example, a cylindrical insulating member is fixed to the outer periphery of the nozzle with an adhesive or the like so as to insulate between the nozzle (4) and the metal main body 6. The cylindrical insulating member is fixed to the main body 6 with screws.

  However, as described above, in the conventional configuration in which the cylindrical insulating member adhered and fixed to the outer periphery of the metal nozzle is screwed to the main body 6, when the fixing between the metal nozzle and the cylindrical insulating member is incomplete, There is a problem that the metal nozzle comes off from the cylindrical insulating member and falls off from the tip portion 1.

  In Patent Document 2, a support member made of an epoxy-based adhesive or the like is formed on the outer periphery of a metal nozzle, and pinned to the tip body through this support member. When a metal is adopted as the tip portion main body, a predetermined electrical insulation between the tip portion main body and the metal nozzle cannot be ensured.

  The present invention has been made in view of the above problems, and the object thereof is to maintain the electrical insulation between the nozzle and the tip body even when a metal nozzle is used, and to provide a tip of the nozzle. An object of the present invention is to provide a distal end portion of an endoscope that can be prevented from falling off from the portion.

In order to achieve the above object, the invention according to claim 1 is a nozzle for supplying air / water toward the observation window, and a concave portion is formed in a bent portion between the base body and the injection body. At the endoscope front end portion where the metal nozzle is disposed, the endoscope is disposed in a cylindrical shape so as to surround the outer periphery of the base body of the metal nozzle, and two nozzles for electrically separating the nozzle and the metal body at the front end portion An insulating member, wherein the two insulating members are coupled to each other in a structure that restricts movement in the axial direction, and one of the first and second insulating members is provided with the above-mentioned A protruding portion that protrudes toward the concave portion of the bent portion of the nozzle to prevent the nozzle from coming off is formed.
According to a second aspect of the present invention, a cylindrical member is used as the first insulating member, a through hole is formed in the cylindrical wall surface, and an end portion that communicates with the through hole and is smaller than the diameter of the through hole. An opening is formed, and a fitting body having a shape that fits into the through hole and the end opening is formed as the second insulating member, and the protrusion for preventing the nozzle from coming off is formed on the distal end side of the fitting body. It is characterized by.

  According to the above configuration, for example, the first insulating member formed in a cylindrical shape from a resin material and provided with a through hole and an end opening, and a fitting body having a shape fitted to the through hole and the end opening, And a second insulating member provided with a protrusion on the tip end side. When the second insulating member is fitted to the first insulating member and both are coupled, an electrical surrounding the outer periphery of the metal nozzle is performed. At the same time that the cylindrical body as the insulator is formed, the protrusion at the end of the second insulating member is disposed on the concave side of the bent portion of the metal nozzle, and this protrusion causes the nozzle to be electrically It is prevented from coming off from the cylindrical body which is an insulator. In other words, according to the present invention, the electrical insulation member is composed of two insulation members (insulation blocks), so that the protrusion for preventing removal is arranged in the concave portion of the nozzle.

  In addition, the fitting body of the first insulating member through-hole and the second insulating member has a structure in which movement in the axial direction is restricted with respect to each other in the cylindrical body constituted by the first and second insulating members, This prevents one of the first insulating member and the second insulating member from coming off the other and falling off the endoscope distal end.

  According to the endoscope distal end portion of the present invention, even when a metal nozzle is used, electrical insulation between the nozzle and the endoscope distal end main body is maintained, and the nozzle is detached from the distal end portion. Has the effect of completely preventing At the same time, there is an advantage that one of the two insulating members provided for disposing the protrusion for preventing the disengagement in the concave part of the bent portion of the metal nozzle does not fall off from the tip part alone.

  1 to 4 show the configuration of the endoscope distal end portion according to the first embodiment. As shown in FIG. 1, the endoscope 10 is disposed on the distal end surface of a metal main body 12. The cap 14 is arranged. For example, an objective optical system 16 having an observation window 15 is attached to the main body 12, and a solid-state imaging device (CCD) 18 is optically connected to the objective optical system 16 via a prism 17. Other configurations such as a window are the same as those of the tip portion described in FIG. A metal nozzle 20 that directs the injection port toward the observation window 15 is provided, and this nozzle 20 is fed to the main body 12 via a first insulating member 21 and a second insulating member 22. Connected / disposed to the air / water pipe 24.

  FIG. 2 shows an enlarged view of the nozzle 20 and the insulating members 21 and 22 (sectional view taken along the line II-II in FIG. 3A). The nozzle 20 is formed by bending a metal circular tube, and as shown in FIG. 3C, a circular tube base 20a and a tip side injection portion 20b formed in a horizontally long shape by crushing the circular tube. A concave portion (a concave portion recessed from the side surface position of the base body 20a) G is formed in a bent portion between the base body 20a and the injection section 20b.

3 and 4 show detailed configurations of the first insulating member 21 and the second insulating member 22, and as shown in each drawing, the first insulating member 21 is made of a resin material. The cylindrical body (ring-shaped body) has a circular (or square) through (fitting) hole 21D penetrating the wall surface of the cylindrical body, and an end opening 21E communicating with the through hole 21D. is formed, the opening width a ₁ of the cylinder circumferential direction of the end opening 21E is smaller than the diameter a ₂ of the through hole 21D.

  On the other hand, the second insulating member 22 is formed of a resin material and is a fitting body including a circular portion 22d that fits into the through hole 21D and a rectangular portion 22e that fits into the end opening 21E, and an inner surface thereof is a circle. The second insulating member 22 is fitted and coupled to the first insulating member 21 to form a complete electrically insulating cylindrical body that is in close contact with the outer periphery of the base body 20a of the nozzle 20. And the protrusion part 22T for preventing nozzle omission toward the inner side of a cylindrical body is formed in the front-end | tip (upper end part of a figure) of the square part 22e of this 2nd insulating member 22. As shown in FIG. That is, as shown in FIG. 2, the protrusion 22T protrudes toward the inside of a cylindrical body formed by coupling of the first and second insulating members 21 and 22, and the protrusion 22T is a nozzle. The nozzle 20 is prevented from falling off by being disposed in the concave portion G formed in the bent portion 20.

  The first embodiment is configured as described above. In assembling the nozzle portion, first, as shown in FIG. 3B, the bent portion recess G of the metal nozzle 20 is formed in the cylinder of the first insulating member 21. The base 20a is inserted in a state facing the through hole 21D and the end opening 21E, and the second insulating member is inserted into the through hole 21D and the end opening 21E of the first insulating member 21 as shown in FIG. The circular part 22d and the rectangular part 22e (fitting body) 22 are fitted together, and the first insulating member 21 and the second insulating member 22 are coupled. Then, the nozzle 20 surrounded by the first insulating member 21 and the second insulating member 22 is disposed at the distal end position of the air / water feeding pipe 24 of the distal end body 12 as shown in FIG. The outer peripheral surface of the first insulating member 21 is pressed and fixed with the screw 25 screwed and inserted from the screw hole 12a on the side surface of the twelve. In the above-described nozzle 20, the first insulating member 21 and the second insulating member 22 are joined and assembled, and the first and second insulating members 21 and 22 are fixed to the tip portion of the nozzle 20. Is used.

  In the tip portion 10 assembled in this way, the metal nozzle 20 is electrically insulated from the main body 12 by the cylindrical body in which the first insulating member 21 and the second insulating member 22 are combined. As shown in the above, since the protrusion 22T protrudes from the second insulating member 21 toward the bent portion recess G, the nozzle 20 extends axially from the cylindrical body constituted by the first and second insulating members 21 and 22. It will not fall out. That is, the protrusion 22T serves to maintain the fixed state of the nozzle 20 by the adhesive, and also serves to prevent the nozzle 20 from falling out of the cylinder even when the adhesive effect by the adhesive is lost.

Further, in the embodiment, the cylindrical first insulating member 21 is screwed, but the second portion 22d of the second insulating member 22 is fitted into the through hole 21D of the first insulating member 21 so that the second The insulating member 22 does not come off from the first insulating member 21 in the axial direction and does not fall off from the distal end portion 10. That is, according to the present invention, the first insulating member 21 and the second insulating member 22 are coupled in order to dispose the protrusion 22T for preventing slippage in the bent portion concave portion G of the nozzle 20. the case of simply combining the can, for example, the insulating member who does not screwed can also happen to fall off from the distal end portion 10, in the first embodiment, larger diameter a than the opening width a ₁ end opening 21E The movement of the first and second insulating members 21 and 22 in the cylindrical body axial direction is restricted by the coupling of the _two through holes 21D and the circular portion 22d, whereby the second insulating member 22 is It will not come off from the tip 10 alone.

  FIG. 5 shows the configuration of the second embodiment. As shown in the drawing, the second embodiment includes two first insulating members 27 and a second cylinder formed from a resin material in a semicylindrical shape. The insulating member 28 is joined to form a cylindrical body. The semi-cylindrical first insulating member 27 is provided with, for example, a square groove 27D at the center for each of the mating surfaces (cylindrical longitudinal cut surfaces) on both sides, and the other semi-cylindrical second insulating member 27 is provided. The member 28 is formed with a square protrusion 28d that fits into the groove 27D on each of the mating surfaces on both sides thereof. Further, a cut circle-shaped projection 28T (a shape obtained by linearly cutting the circle at a half or less portion) protruding inward is integrally formed at the tip (upper side in the drawing) of the second insulating member 28.

  According to the second embodiment, the protrusions 28d are fitted into the grooves 27D, and the first insulating member 27 and the second insulating member 28 are combined to surround the outer periphery of the base body 20a of the metal nozzle 20. A cylinder is formed. Moreover, the 1st and 2nd insulating members 27 and 28 which assembled | attached the nozzle 20 are attached to the front-end | tip part 10 by screwing the 1st insulating member 27 similarly to the case of FIG. Also in the second embodiment, as in the case of FIG. 2, the protruding portion 28 </ b> T is disposed in the bent portion concave portion G of the nozzle 20, thereby preventing the nozzle 20 from falling off.

  FIG. 6 shows the configuration of the third embodiment. In the third embodiment, the first insulating member 30 is a resin cylindrical body, and a resin pin-like body 31 is inserted and disposed in a hole 30D provided on the tip side (upper side) of the first insulating member 30. Thus, the tip of the pin-shaped body 31 serves as the protrusion 31T, and the protrusion 31T is disposed in the bent portion recess G of the nozzle 20. Such a configuration also prevents the nozzle 20 from falling off. In addition, although it is a reference example, it is also possible to employ a structure in which the pin-shaped body 31 is a metal pin and the metal pin does not contact the tip end body 12.

It is sectional drawing which shows the structure of the endoscope front-end | tip part which concerns on 1st Example of this invention. It is the II-II sectional view taken on the line of FIG. 3 (A) which shows the structure of the nozzle of 1st Example, and the 1st and 2nd insulating member. The structure of the nozzle of 1st Example and the 1st and 2nd insulating member is shown, A figure (A) is a top view, A figure (B) is a side view, A figure (C) is a front view. It is a perspective view which shows the structure of the 1st and 2nd insulation member of 1st Example. It is a perspective view which shows the structure of the 1st and 2nd insulation member of 2nd Example. It is sectional drawing which shows the structure of the nozzle of 1st Example, and the 1st and 2nd insulating member. It is a figure which shows the structure of the conventional endoscope front-end | tip part (tip surface). It is sectional drawing which shows the structure of the nozzle part of the conventional endoscope front-end | tip part.

Explanation of symbols

1, 10 ... End of endoscope, 3, 15 ... Observation window,
4 ... Nozzle, 4a, 20a ... Base,
6, 12 ... tip body, 8, 25 ... screw,
20 ... Metal nozzle 21, 27, 30 ... First insulating member,
21D ... through hole, 22d ... circular part,
22, 28, 31 ... second insulating member,
22T, 28T, 31T ... projection.

Claims (2)

In the tip of the endoscope for supplying air / water toward the observation window, in which a metal nozzle in which a concave portion is formed in a bent portion between the base body and the injection body is disposed,
Two insulating members arranged in a cylindrical shape so as to surround the outer periphery of the base body of the metal nozzle, and electrically separating the nozzle and the tip metal body, and the two insulating members are mutually connected Providing first and second insulating members coupled in a structure that restricts movement in the axial direction;
An endoscope distal end portion, wherein one of the first and second insulating members is formed with a protrusion that protrudes toward the concave portion of the bent portion of the nozzle to prevent the nozzle from coming off.   A cylindrical member is used as the first insulating member, a through hole is formed in the cylindrical wall surface, an end opening smaller than the diameter of the through hole is formed in communication with the through hole, and the second insulating member is formed. The insulating member is formed with a fitting body having a shape that fits into the through hole and the opening of the end portion, and the protrusion for preventing the nozzle from coming off is formed on the distal end side of the fitting body. Endoscope tip.

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