JP2006192087A - Distal end part of endoscope to be inserted into large intestine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distal end part of an endoscope to be inserted into the large intestine to be hardly disengaged from a fold of the intestinal tract when the intestinal tract is straightened by hooking the distal end of an insertion part on the fold of the intestinal tract and pulling the distal end up to the hand side or twisting the distal end around the axis, permitting the insertion part to be easily and smoothly inserted into the large intestine. <P>SOLUTION: The distal end part of the endoscope to be inserted into the large intestine comprises an observation window 6 for taking in an optical image of a subject disposed on the distal end surface 5a of a distal end body 5 constituting the distal end of the insertion part 1, and a tube-like distal end hood 10 projecting forward from the outer edge of the distal end body 5. The distal end of the endoscope also comprises a plurality of projections 11 disposed at intervals in the direction around the axis of the distal end hood 10 on the outer peripheral surface of the distal end hood 10. Each projection 11 is such a shape that at least the rear surface part and the side surface part of the projection swell from the outer surface of the distal end hood 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a distal end portion of an endoscope for large intestine insertion.

  An endoscope for insertion of the large intestine is inserted into the large intestine from the subject's anus. When the large intestine is traced from the anus side, it passes through the short rectum and literally curves in a sigmoid shape with a small curvature radius in the sigmoid colon. In most cases, the lower colon is bent at 90 ° or more even at the portion from the lower colon to the transverse colon.

  In addition, parts other than the rectum are not fixed to the body wall, and the sigmoid colon and the like often expand and contract freely or change shape due to external force. It is difficult to insert the endoscope into the deep part of the large intestine simply by extending the back.

  Therefore, after inserting the insertion portion of the endoscope into the intestinal tract to some extent, the technique of bending the bending portion formed at the distal end of the insertion portion with a small curvature radius by remote control and hooking the distal end of the insertion portion on the fold of the intestinal tract Done.

  When the tip of the insertion part is hooked on the fold of the intestinal tract in this way, the operation of drawing the tip of the insertion part toward the proximal side and contracting the intestinal tract like an accordion to make it straight, and twisting the insertion part around the axis line By appropriately combining with the operation of rotating the large amount, the insertion portion can be inserted relatively easily into the deep part of the large intestine.

In general, the distal end portion of the endoscope for inserting a large intestine into the large intestine is generally provided with an observation window on the distal end surface of the insertion portion for capturing a light image of a subject in front of the insertion portion. A distal end hood that protrudes forward from the outer edge of the distal end surface of the insertion portion is provided (for example, Patent Document 1).
JP 10-248792 A

  However, when performing the above-described insertion procedure with a conventional endoscope for large intestine insertion, if the tip of the insertion section is hooked on the fold of the intestinal tract and pulled toward the hand side or twisted around the axis, In many cases, the engagement with the folds slipped and the insertion operation had to be repeated from the beginning, and the insertion took a very long time.

  Therefore, the present invention makes it difficult to disengage the distal end of the insertion portion from the fold when the distal end of the insertion portion is hooked on the fold of the intestinal tract and pulled toward the proximal side or twisted around the axis to straighten the intestinal tract. It is an object of the present invention to provide a distal end portion of an endoscope for large intestine insertion that can be easily and smoothly inserted into the large intestine.

  In order to achieve the above object, the distal end portion of the endoscope for large intestine insertion according to the present invention is provided with an observation window for capturing a light image of a subject on the distal end surface of the distal end main body constituting the distal end of the insertion portion. In addition, at the distal end portion of the endoscope for large intestine insertion in which a cylindrical distal end hood projects forward from the outer edge portion of the distal end portion main body, at least the rear surface portion and the side surface portion are disposed on the outer peripheral surface of the distal end hood. A plurality of protrusions having a shape raised from the outer peripheral surface of the front hood are projected at intervals in the direction around the axis of the tip hood.

  The tip hood may be formed of a transparent member, and a convex portion may protrude from the outer peripheral surface of the transparent tip hood, or the tip hood may be detachable from the tip body. . Moreover, the convex part may be formed integrally with the tip hood.

  In addition, the portion of the tip hood outer peripheral surface located at a position closer to the front than the convex portion may be formed in a tapered shape in which the outer diameter gradually decreases toward the front side, and the outer peripheral surface of the convex portion gradually increases toward the front side. You may form in the taper shape where an outer diameter becomes small.

  According to the distal end portion of the endoscope for large intestine of the present invention, a plurality of convex portions having a shape in which at least the rear surface portion and the side surface portion rise from the outer peripheral surface of the distal end hood are formed around the axis of the distal end hood on the outer circumferential surface of the distal end hood. By projecting at an interval in the direction, the tip of the insertion part is hooked on the fold of the intestinal tract, and when the intestinal tract is straightened by pulling or rotating to the proximal side, the engagement with the fold is difficult to disengage. It can be easily and smoothly inserted into it.

  An observation window for capturing a light image of the subject is arranged on the distal end surface of the distal end main body constituting the distal end of the insertion portion, and a cylindrical distal end hood is projected forward from the outer edge portion of the distal end main body. At the distal end of the endoscope for large intestine insertion, on the outer peripheral surface of the distal end hood, a plurality of convex portions with at least a rear surface portion and a side surface portion protruding from the outer peripheral surface of the distal end hood are spaced apart in the direction around the axis of the distal end hood. Open and project.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is an external view of the endoscope for large intestine insertion. The bending portion 2 formed near the distal end of the flexible insertion portion 1 is operated by an operation knob in the operation portion 3 connected to the proximal end of the insertion portion 1. By operating 4, it can be bent at an arbitrary angle in an arbitrary direction as indicated by a two-dot chain line.

  The rigid short cylindrical tip body 5 connected to the tip of the bending portion 2 incorporates various functional elements such as an objective optical system and a solid-state imaging device. The tip portion is configured.

  A cylindrical tip hood 10 protrudes forward from the outer edge portion of the tip portion main body 5, and a plurality of convex portions 11 are arranged around the axis of the tip hood 10 on the outer peripheral surface of the tip hood 10. Projected at intervals.

  FIG. 1 shows the vicinity of the most distal portion of the insertion portion 1, and an observation window 6 for capturing a light image of a subject, an illumination window (not shown), and the like are arranged on the distal end surface 5 a of the distal end portion body 5. An endoscope can be observed in front of the insertion portion 1. V is an observation visual field range.

  The front end hood 10 formed in a cylindrical shape has a front half projecting forward from the front end surface 5 a of the front end portion main body 5, and a rear half is removably engaged with the outer peripheral portion of the front end portion main body 5. It has been stopped. As the locking structure, various known structures such as elastic tightening, screw engagement, or uneven fitting can be employed. However, the tip hood 10 may be configured not to be detached from the tip body 5.

  Such a tip hood 10 is formed of a transparent plastic material, and even if the tip hood 10 exists within the observation visual field range V, the tip hood 10 is transmitted through and the state of the far side of the tip hood 10 is observed. Can be observed with an endoscope.

  Only the portion of the convex portion 11 is formed in a shape that rises from the outer surface of the tip hood 10, and the height t of the raised portion is about 1 to 3 mm. In this embodiment, as shown in FIG. 4 showing the IV-IV cross section in FIG. 3 and FIG. 1 which is an external perspective view, the four convex portions 11 integrally formed with the tip hood 10 are For example, every 90 ° in the direction around the axis of the tip hood 10 is provided with a space between each other.

  However, the intervals between the plurality of convex portions 11 are not necessarily equal, and may be slightly displaced in the axial direction. Further, the number of convex portions 11 is not necessarily four, and may be eight or other numbers as shown in FIG. However, it is desirable that it is in the range of about 3 to 12 from practical use.

  FIG. 6 shows a state where the endoscope for large intestine insertion according to the embodiment configured as described above is inserted into the large intestine. For example, in the curved portion of the intestinal tract, the convex portion 11 passes through the fold 100. The bending portion 2 is bent at the position, and the convex portion 11 is engaged with the back surface portion of the fold 100.

  Then, as shown in FIG. 7, by appropriately performing an operation of pulling the insertion portion 1 toward the proximal side and an operation of twisting the insertion portion 1 about the axis, the fold 100 that engages the convex portion 11 is moved to the anal side. The intestinal tract can be shortened to a straight state by pulling it on, or the intestinal tract originally bent in a loop shape can be straightened, so that it can be inserted into the large intestine deeply by pushing the insertion portion 1 in succession. Can be easily performed.

  In such an operation, according to the present invention, the convex portion 11 protruding from the outer peripheral surface of the tip hood 10 is well hooked to the fold 100, and when the operation of pulling the insertion portion 1 toward the hand side is performed or the screw is twisted around the axis. Since the engagement with the pleats 100 cannot be easily disengaged when closed, the intestinal tract can be moved as desired.

  FIG. 8 shows the distal end portion of the endoscope for large intestine insertion according to the second embodiment of the present invention, and a portion 10a at a position closer to the convex portion 11 on the outer peripheral surface of the distal end hood 10 is gradually moved forward. It is formed in a tapered shape with a small outer diameter so that it can be smoothly inserted into the intestinal tract. The point that a plurality of convex portions 11 are formed in the direction around the axis of the tip hood 10 is the same as in the first embodiment, and the same applies to the following embodiments.

  FIG. 9 shows the distal end portion of the endoscope for large intestine insertion according to the third embodiment of the present invention, and the outer peripheral surface 11a of the convex portion 11 is formed in a tapered shape in which the outer diameter gradually decreases toward the front side. It can be smoothly inserted into the intestinal tract.

  In this embodiment, it cannot be said that the front side portion of the convex portion 11 is raised from the surface of the tip hood 10, but if the rear surface portion 11 b of the convex portion 11 is raised, the insertion portion 1. When it is difficult to disengage from the fold 100 when the operation of pulling the ridge to the hand side is performed, and the side surface portion of the convex portion 11 has a raised shape, the fold 100 is obtained when the insertion portion 1 is twisted around the axis. Is difficult to disengage. Therefore, the convex part 11 should just be the shape where the rear surface part 11b and the side surface part rose from the outer peripheral surface of the front-end | tip hood 10. FIG.

  FIG. 10 shows the distal end portion of the endoscope for large intestine insertion according to the fourth embodiment of the present invention. Compared with the first embodiment, the distal end hood 10 is extended to the front to extend the convex portion 11. Is within the observation visual field range V from the observation window 6. By configuring in this way, the convex portion 11 can be hooked accurately as aimed at the fold 100.

  FIG. 11 shows the distal end portion of the endoscope for large intestine insertion according to the fifth embodiment of the present invention. The distal end hood 10 is formed integrally with the distal end portion main body 5 from an opaque material. The present invention can be applied even to the tip portion having such a configuration.

It is side surface fragmentary sectional view of the front-end | tip part of the endoscope for large intestine insertion of the 1st Example of this invention. 1 is an external view showing an overall configuration of a large intestine insertion endoscope according to a first embodiment of the present invention. It is an external appearance perspective view of the front-end | tip part of the endoscope for large intestine insertion of the 1st Example of this invention. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1 of the distal end portion of the endoscope for large intestine insertion according to the first embodiment of the present invention. It is sectional drawing which shows the modification of the front-end | tip part of the endoscope for large intestine insertion of the 1st Example of this invention. It is a schematic diagram of the use condition of the endoscope for large intestine insertion of the 1st example of the present invention. It is a schematic diagram of the use condition of the endoscope for large intestine insertion of the 1st example of the present invention. It is side surface sectional drawing of the front-end | tip part of the endoscope for large intestine insertion of the 2nd Example of this invention. It is side surface sectional drawing of the front-end | tip part of the endoscope for large intestine insertion of the 3rd Example of this invention. It is side surface sectional drawing of the front-end | tip part of the endoscope for large intestine insertion of the 4th Example of this invention. It is side surface sectional drawing of the front-end | tip part of the endoscope for large intestine insertion of the 5th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 5 Tip part main body 5a Tip surface 6 Observation window 10 Tip hood 11 Convex part 100 Deflection

Claims (6)

An observation window for capturing a light image of a subject is arranged on the distal end surface of the distal end main body constituting the distal end of the insertion portion, and a cylindrical distal end hood projects forward from the outer edge portion of the distal end main body. At the distal end of the endoscope for inserted large intestine,
A plurality of convex portions having a shape in which at least a rear surface portion and a side surface portion swell from the outer peripheral surface of the tip hood are projected on the outer peripheral surface of the tip hood at intervals in the direction around the axis of the tip hood. The tip of the endoscope for large intestine insertion.   The distal end portion of the endoscope for large intestine insertion according to claim 1, wherein the distal end hood is formed of a transparent member, and the convex portion is projected from an outer peripheral surface of the transparent distal end hood.   The distal end portion of the endoscope for large intestine insertion according to claim 1 or 2, wherein the distal end hood is detachable from the distal end portion main body.   The distal end portion of the endoscope for large intestine insertion according to any one of claims 1 to 3, wherein the convex portion is formed integrally with the distal end hood.   The large intestine according to any one of claims 1 to 4, wherein a portion of the outer peripheral surface of the tip hood at a position closer to the front than the convex portion is formed in a tapered shape in which the outer diameter gradually decreases toward the front side. The tip of the insertion endoscope.   The distal end portion of the endoscope for large intestine insertion according to any one of claims 1 to 5, wherein an outer peripheral surface of the convex portion is formed in a tapered shape in which the outer diameter gradually decreases toward the front side.

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