JP2006192088A - 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, 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. In the distal end part of the endoscope, an insertion assistant band 10 is detachably attached to the distal end body 5 to surround the whole outer periphery of the distal end body 5 in the direction around the axis, and a guard part 11 is integrally formed with the insertion assistant band 10 to project and extend sideways from the outer periphery of the insertion assistant band 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 inserting a 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 a short rectum and literally curves in an S shape with a small radius of curvature in the sigmoid colon. In most cases, the portion that reaches the descending colon, and further transitions from the descending colon to the transverse colon is bent at 90 ° or more.

  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 bending portion formed at the distal end of the insertion portion is bent with a small radius of curvature by remote control, and the distal end of the insertion portion is hooked on the fold of the intestinal tract. One of the powerful insertion techniques is to make the intestinal tract shrink like an accordion by pulling it into a straight line, and then insert it deeply by repeating it appropriately.

In general, the distal end portion of the endoscope for inserting a large intestine inserted 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. And although there were many things which were provided with the tip hood which protrudes ahead from the outer edge of the tip face of the insertion part (for example, patent documents 1), in recent years many things which do not provide a tip hood are increasing (for example, Patent Document 2).
JP 10-248792 A JP2002-125915

  When performing the above insertion procedure with a conventional colonoscopy endoscope, when the distal end of the insertion portion is hooked on the fold of the intestinal tract and pulled toward the proximal side, the engagement between the distal end of the insertion portion and the fold slips off, In many cases, the insertion operation takes a long time because the insertion operation has to be performed again from the beginning.

  Therefore, the present invention makes it easy to smoothly and smoothly insert the insertion portion into the large intestine when the distal end of the insertion portion is hooked on the fold of the intestinal tract and pulled toward the proximal side to straighten the intestinal tract. An object of the present invention is to provide a distal end portion of an endoscope for large intestine insertion.

  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. At the distal end of the endoscope for large intestine insertion, an insertion assisting band that surrounds the outer periphery of the distal end main body in the direction around the axis is provided detachably with respect to the distal end main body. A hook-shaped portion extending in a protruding manner is integrally formed on the insertion assisting band.

  The insertion assisting band may be attached to the distal end body so that it does not protrude forward from the distal end surface of the distal end body, and the insertion assisting band is formed of an elastic material and is attached to the distal end body. And may be attached in a state of being tightened elastically. Moreover, the hook-shaped part may be formed in the full width of the insertion auxiliary band, and the hook-shaped part may be formed in a tapered shape in which the outer diameter gradually decreases toward the front side.

  Further, a plurality of hook-shaped portions may be formed at intervals in the axial direction of the auxiliary insertion band, and in that case, the outer diameter of the hook-shaped portion located at the rear of the plurality of hook-shaped portions gradually increases toward the rear side. The outer diameter of the hook-shaped part located in the front among the plurality of hook-shaped parts may be smaller than the outer diameter of the hook-shaped part positioned in the rear.

  In addition, a plurality of recesses may be formed in the bowl-shaped portion at intervals in the circumferential direction.

  According to the distal end portion of the endoscope for large intestine insertion of the present invention, the hook-shaped portion extending laterally from the outer peripheral portion is integrally formed on the insertion assisting band detachably attached to the distal end portion main body, so that the insertion portion When the tip of the hook is hooked on the fold of the intestinal tract and pulled toward the proximal side, the hooked portion is easily hooked to the fold and it is difficult to disengage from the fold, and the insertion portion is easily and smoothly inserted into the large intestine. be able to.

  At the distal end of the endoscope for large intestine insertion, where the observation window for capturing the optical image of the subject is arranged on the distal end surface of the distal end main body that constitutes the distal end of the insertion section, the outer periphery of the distal end main body is rotated around the axis around the entire circumference. An insertion auxiliary band that surrounds in the direction is provided to be detachable from the distal end body, and a hook-like portion that extends laterally from the outer peripheral portion of the insertion auxiliary band is formed integrally with the insertion auxiliary band.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 3 is an external view of the endoscope for inserting a large intestine. A 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.

  The distal end body 5 is detachably provided with an insertion auxiliary band 10 that surrounds the outer periphery of the distal end main body 5 in the direction around the axis, and a hook-like portion 11 that spreads laterally from the outer peripheral portion of the insertion auxiliary band 10 is provided as an insertion auxiliary band. 10 is integrally formed to project.

  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.

  As shown in FIG. 2 which is a perspective view of a single unit, the insertion assisting band 10 is formed in an annular shape with an inner diameter dimension smaller than an outer diameter dimension of the distal end body 5 by using a rubber material or an elastic plastic material. It can be detachably attached to the outer peripheral portion of the tip body 5 by elastically deforming in the direction of expanding the diameter.

  The insertion assisting band 10 is integrally formed with a hook-shaped portion 11 that extends laterally from the outer periphery to the entire periphery, and the hook-shaped portion 11 of this embodiment is shown in cross-sectional shape in FIG. Thus, a smooth rounded curve is drawn from the insertion assisting band 10 and protrudes in a convex shape, for example, about 1 to 3 mm.

  Then, the insertion assisting band 10 in which such a hook-shaped portion 11 is formed elastically tightens the distal end portion main body 5 so that it does not protrude forward from the distal end surface 5 a of the distal end portion main body 5. It is attached.

  FIG. 4 shows a state where the large intestine insertion endoscope of the embodiment configured as described above is inserted into the large intestine. For example, in the curved portion of the intestinal tract, the hook-shaped portion 11 is formed on the inner wall of the intestinal tract. The bending portion 2 is bent at a position passing through the fold 100, and the hook-shaped portion 11 is engaged with the back surface portion of the fold 100.

  Then, as shown in FIG. 5, if the operation of pulling the insertion portion 1 toward the hand side is performed, the fold 100 engaging with the hook-like portion 11 is pulled toward the anus side, so that the intestinal tract contracts and becomes a straight state. Then, the insertion portion 1 can be pushed in and then inserted into the deep part of the large intestine by performing an appropriate rotation operation and the like.

  In such an operation, according to the present invention, when the hook-shaped portion 11 protruding from the insertion assisting band 10 is sufficiently hooked on the fold 100 and an operation of pulling the insertion portion 1 toward the hand side is performed, Since the joint cannot be removed easily, the intestinal tract can be quickly shortened to a straight state.

  FIG. 6 shows the distal end portion of the endoscope for large intestine insertion according to the second embodiment of the present invention, and the hook-shaped portion 11 is formed in the entire width of the insertion assisting band 10 so that the entire insertion assisting band 10 is apparently formed. In this example, the cross-sectional shape is circular as a whole. Even if comprised in this way, the effect similar to the 1st Example can be acquired.

  FIG. 7 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 portion of the bowl-shaped 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. The rear end wall of the bowl-shaped portion 11 protrudes from the surface of the insertion assisting band 10 so as to form a step and is easily caught on the fold 100 of the intestinal tract.

  FIG. 8 shows the distal end portion of an endoscope for large intestine insertion according to a fourth embodiment of the present invention, in which a bowl-shaped portion 11 having the same shape as that of the third embodiment is formed over the entire width of the insertion assisting band 10. Even with this configuration, the same effect as that of the third embodiment can be obtained.

  FIG. 9 shows the distal end portion of the endoscope for large intestine insertion according to the fifth embodiment of the present invention, in which a plurality of hook-shaped portions 11 are formed in parallel at intervals in the axial direction of the auxiliary insertion band 10. It is. With this configuration, the catching ability with respect to the fold 100 is further improved, and the protruding height of the hook-like portion 11 can be lowered to, for example, about 0.5 to 2 mm.

  FIG. 10 shows the distal end portion of the endoscope for large intestine insertion according to the sixth embodiment of the present invention. Similar to the fifth embodiment, a plurality of hooks are spaced apart in the axial direction of the insertion assisting band 10. The parts 11A and 11B are formed in parallel.

  However, in this embodiment, the flange portion 11A located at the front is formed in a tapered shape with a gradually decreasing outer diameter toward the front side, and the flange portion 11B positioned at the rear is a tapered shape with a gradually decreasing outer diameter toward the rear side. Is formed.

  With this configuration, if the insertion / removal operation into the intestinal tract is performed slowly, the hook-shaped portions 11A, 11B are hooked on the fold 100. Can be easily inserted and removed.

  In this embodiment, the outer diameter of the hook-shaped part 11A located at the front is formed smaller than the outer diameter of the hook-shaped part 11B located at the rear (that is, Da <Db). The hooks 11A and 11B with respect to the fold 100 are reduced.

  FIG. 11 is a cross-sectional view perpendicular to the axis of the auxiliary insertion band 10 of the seventh embodiment of the present invention, and a plurality of recesses 12 are formed in the outer peripheral portion of the bowl-shaped portion 11 with a circumferential interval. . This can be applied to the first to sixth embodiments. The number of recesses 12 is preferably in the range of about 3 to 12 in practice.

  By configuring in this way, the intestinal tract may be rotated by an operation of hooking the hook-shaped portion 11 on the fold 100 and twisting it around the axis, and insertion into the intestinal tract may be performed more easily.

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. It is a single-piece | unit perspective view of the insertion auxiliary | assistant band of 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 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 fragmentary sectional view of the front-end | tip part of the endoscope for large intestine insertion of the 2nd Example of this invention. It is a side surface fragmentary sectional view of the front-end | tip part of the endoscope for large intestine insertion of the 3rd Example of this invention. It is side surface partial 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 fragmentary sectional view of the front-end | tip part of the endoscope for large intestine insertion of the 5th Example of this invention. It is side surface fragmentary sectional drawing of the front-end | tip part of the endoscope for large intestine insertion of the 6th Example of this invention. It is sectional drawing perpendicular | vertical to the axis line of the insertion auxiliary | assistant band of 7th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 5 Front-end | tip part main body 5a Front end surface 6 Observation window 10 Insertion auxiliary band 11 Gutter-shaped part 12 Recessed part 100 Deflection

Claims (9)

In the distal end portion of the endoscope for large intestine insertion in which an observation window for capturing a light image of the subject is arranged on the distal end surface of the distal end portion main body constituting the distal end of the insertion portion,
An insertion assisting band that surrounds the outer periphery of the tip end body in the axial direction over the entire circumference is provided detachably with respect to the tip end body, and a hook-shaped portion that extends laterally from the outer periphery of the insertion assisting band is inserted into the insertion support band. A distal end portion of an endoscope for large intestine insertion, wherein the distal end portion is formed integrally with an auxiliary band.   The distal end portion of the endoscope for large intestine insertion according to claim 1, wherein the insertion assisting band is attached to the distal end portion main body so as not to protrude forward from the distal end surface of the distal end portion main body.   The distal end portion of the endoscope for large intestine insertion according to claim 1 or 2, wherein the insertion assisting band is formed of a resilient material and is attached in a state of being elastically tightened with respect to the distal end portion main body.   4. The distal end portion of the endoscope for large intestine insertion according to claim 1, wherein the hook-shaped portion is formed over the entire width of the auxiliary insertion band.   The distal end portion of the endoscope for large intestine insertion according to claim 1, 2, 3, or 4, wherein the flange-like portion is formed in a tapered shape in which the outer diameter gradually decreases toward the front side.   The distal end portion of the endoscope for large intestine insertion according to claim 1, wherein a plurality of the hook-like portions are formed at intervals in the axial direction of the insertion assisting band.   The distal end portion of the endoscope for large intestine insertion according to claim 6, wherein an outer diameter of the hook-shaped portion located rearward among the plurality of hook-shaped portions is formed to gradually become smaller rearward.   The distal end of the endoscope for large intestine insertion according to claim 6 or 7, wherein an outer diameter of a hook-shaped part positioned forward among the plurality of hook-shaped parts is smaller than an outer diameter of a hook-shaped part positioned rearward. Department.   The distal end portion of the endoscope for large intestine insertion according to any one of claims 1 to 8, wherein a plurality of concave portions are formed at intervals in the circumferential direction in the bowl-shaped portion.

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