JP2006192091A - 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, capable of preventing a bending part from being easily disengaged from a fold of the intestinal tract when the intestinal tract is straightened by hooking the bending part on the fold of the intestinal tract and pulling the bending part up to the proximal side or twisting the bending part around the axis, and permitting the flexible insertion part to be easily and smoothly inserted into the large intestine. <P>SOLUTION: The insertion part of the endoscope to be inserted into the large intestine comprises the bending part 2 disposed at the distal end of the flexible insertion part attached to the outside by a flexible tube. One or a plurality of projecting lines 6 are formed on the outer surface of the bending part 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an insertion 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 the flexible insertion portion of the endoscope is inserted into the intestinal tract to some extent, the bending portion formed at the distal end of the flexible insertion portion is bent with a small radius of curvature by remote control, and the distal end portion is bent into the intestinal tract. The technique of hooking to the folds is performed.

  When the bending portion is hooked on the fold of the intestinal tract in this way, the flexible insertion portion is obtained by hooking the bending portion on the fold of the intestinal tract and pulling it toward the hand side or twisting it around the axis to straighten the intestinal tract. Can be inserted into the deep part of the large intestine relatively easily.

In general, an insertion portion of an endoscope for large intestine insertion that is inserted into the large intestine generally has a bending portion that can be bent by remote operation at the distal end portion of the flexible insertion portion that is sheathed by a flexible tube. The curved portion is provided with an elastic tubular member (for example, Patent Document 1).
JP-A-9-24020

  When performing the insertion procedure as described above with a conventional endoscope for large intestine insertion, if the bending portion is hooked on the fold of the intestinal tract and pulled toward the hand side or twisted around the axis, the relationship between the bending portion and the fold will occur. In many cases, the insertion slipped off and the insertion operation had to be re-executed from the beginning, and the insertion took a very long time.

  In view of this, the present invention makes it difficult to disengage the bending portion from the fold when the bending portion is hooked on the fold of the intestinal tract and pulled toward the hand side or twisted around the axis to linearize the intestinal tract. It is an object of the present invention to provide an insertion portion of an endoscope for large intestine insertion that can easily and smoothly insert a sex insertion portion into the large intestine.

  In order to achieve the above object, the insertion portion of the endoscope for large intestine insertion according to the present invention has a bending portion that can be bent by a remote operation at the distal end portion of the flexible insertion portion covered with a flexible tube. In the insertion part of the provided endoscope for large intestine, one or a plurality of ridges are formed to protrude on the outer surface of the bending part, and the bending part is covered with an elastic tubular member, The ridge may be formed integrally with the tubular member.

  Each ridge may be formed so as to protrude in the direction around the axis of the curved portion, and one or a plurality of such ridges may be provided at intervals in the axial direction of the curved portion, or each ridge may be curved. It may be formed so as to protrude in a direction parallel to the axis of the portion, and a plurality of such ridges may be provided at intervals in the direction around the axis of the curved portion.

  Further, the ridges protruding in the direction around the axis of the bending portion and the ridges protruding in the direction parallel to the axis of the bending portion may be formed protruding on the outer surface of the bending portion, or the ridges. May be formed so as to protrude spirally from the outer surface of the curved portion.

  Further, the ridges may be formed in a shape that is divided in the middle, and the ridges may be formed only in the vicinity of the tip of the bending portion or in the entire bending portion.

  According to the insertion portion of the endoscope for large intestine insertion of the present invention, by forming one or a plurality of ridges on the outer surface of the bending portion, the bending portion is hooked on the fold of the intestinal tract and pulled toward the proximal side or the axis line When performing an operation of twisting around to straighten the intestinal tract, the bending portion and the fold are hardly disengaged, and the flexible insertion portion can be easily and smoothly inserted into the large intestine.

  In the insertion portion of the endoscope for large intestine insertion provided with a bending portion that can be bent by remote operation at the distal end portion of the flexible insertion portion covered with a flexible tube, one piece on the outer surface of the bending portion or A plurality of ridges are formed to protrude.

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

  The structure of the bending portion 2 is, for example, a well-known structure in which a large number of node rings are connected with rivets so as to be rotatable. The curved portion 2 is covered with an elastic tubular member such as a rubber tube and pulled from the operation knob 4 side. It is bent and driven by an operating wire to be operated.

  Various functional elements such as an objective optical system and a solid-state image sensor are incorporated in a hard short cylindrical tip body 5 connected to the tip of the bending portion 2. Further, a plurality of ridges 6 are formed to protrude from the outer surface of the curved portion 2.

  FIG. 1 shows the vicinity of the most distal portion of the flexible insertion portion 1, and an observation window 7 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. Thus, the front of the flexible insertion portion 1 can be observed with an endoscope.

  The ridge 6 is formed of an elastic material by integral molding with the tubular member 8 that covers the curved portion 2, and has an arcuate cross-sectional shape around the axis of the curved portion 2 from the surface of the tubular member 8. It is formed in an annular shape protruding in a convex shape over the entire circumference.

  In this embodiment, three ridges 6 as described above are formed so as to protrude in parallel in the axial direction of the bending portion 2 at equal intervals. However, the interval between the plurality of ridges 6 is not necessarily equal, and it is sufficient that at least one ridge 6 is provided.

  FIG. 3 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 ridge 6 is a fold 100 on the inner wall of the intestinal tract. The bending portion 2 is bent at a position where it passes through the portion, and the ridge 6 is engaged with the fold 100.

  Then, as shown in FIG. 4, when the flexible insertion portion 1 is pulled toward the proximal side, the fold 100 that engages with the ridge 6 is pulled toward the anal side, so that the intestinal tract contracts and is straight. Therefore, the insertion into the deep part of the large intestine can be easily performed by pushing the flexible insertion portion 1 after performing an appropriate rotation operation or the like.

  In such an operation, in the present invention, when the protrusion 6 projecting from the outer peripheral surface of the bending portion 2 is well hooked to the fold 100 and the operation of pulling the flexible insertion portion 1 toward the hand side is performed, the fold is formed. Since the engagement with 100 is not easily disengaged, the intestinal tract can be quickly shortened to a straight state.

  FIG. 5 shows an insertion portion of the endoscope for large intestine insertion according to the second embodiment of the present invention, in which the ridge 6 is formed so as to protrude in a direction parallel to the axis of the bending portion 2, and is a VI-VI cross section in FIG. As shown in FIG. 6, eight such ridges 6 are provided at equal intervals in the direction around the axis of the bending portion 2. The intervals between the plurality of ridges 6 do not necessarily have to be equal. Further, it is sufficient that at least one ridge 6 is provided, and it is desirable that it is in a range of about 3 to 12 from a practical viewpoint.

  In the endoscope for large intestine insertion of the second embodiment configured as described above, the flexible insertion portion 1 is rotated around the axis while the ridge 6 is engaged with the fold 100 of the intestinal tract. Thus, the looped intestinal tract is rotated to be in a straight state, and after performing an appropriate pulling operation, etc., the flexible insertion portion 1 is pushed in to facilitate insertion into the deep intestine. It can be carried out.

  FIG. 7 shows a third embodiment of the present invention, in which a ridge 6 similar to that of the second embodiment is formed to protrude on the outer peripheral surface over the entire length of the curved portion 2. Even if comprised in this way, the effect similar to a 2nd Example can be acquired.

  FIG. 8 shows the insertion portion of the endoscope for large intestine insertion according to the fourth embodiment of the present invention. The protrusion 6A protrudes in the direction around the axis of the bending portion 2 and protrudes in the direction parallel to the axis of the bending portion 2. The protruding ridge 6B is formed so as to protrude from the outer surface of the curved portion 2. By comprising in this way, both shortening operation and rotation operation of an intestinal tract can be performed easily, and the insertion to the large intestine deep part can be performed easily.

  FIG. 9 shows the insertion part of the endoscope for large intestine insertion according to the fifth embodiment of the present invention, in which the ridges 6 are formed so as to project spirally from the outer surface of the bending part 2. Even if comprised in this way, the same effect can be acquired.

  FIG. 10 shows an insertion part of an endoscope for large intestine insertion according to a sixth embodiment of the present invention, in which a plurality of ridges 6 protruding in the direction around the axis of the bending part 2 are each divided in the middle. Is formed. Even if comprised in this way, both shortening operation and rotation operation of an intestinal tract can be performed easily, and insertion to a large intestine deep part can be performed easily.

  FIG. 11 shows an insertion portion of an endoscope for large intestine insertion according to a seventh embodiment of the present invention, in which a protruding strip 6A protruding in the direction around the axis of the bending portion 2 is formed in a shape divided in the middle. The protrusion 6B protruding in the direction parallel to the axis of the bending portion 2 is disposed at the dividing position. Even if comprised in this way, both shortening operation and rotation operation of an intestinal tract can be performed easily, and insertion to a large intestine deep part can be performed easily.

It is a side surface fragmentary sectional view of the insertion 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 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 a side surface fragmentary sectional view of the insertion part of the endoscope for large intestine insertion of the 2nd Example of this invention. It is VI-VI sectional drawing in FIG. 5 of the tubular member and convex strip of the insertion part of the endoscope for large intestine insertion of the 2nd Example of this invention. It is a side view of the insertion part of the endoscope for large intestine insertion of the 3rd Example of this invention. It is a side view of the insertion part of the endoscope for large intestine insertion of the 4th Example of this invention. It is a side view of the insertion part of the endoscope for large intestine insertion of the 5th Example of this invention. It is a side view of the insertion part of the endoscope for large intestine insertion of the 6th Example of this invention. It is a side view of the insertion part of the endoscope for large intestine insertion of the 7th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible insertion part 2 Bending part 5 Front-end | tip part main body 5a Front end surface 6,6A, 6B Projection 7 Observation window 8 Tubular member 100 Deflection

Claims (9)

In the insertion portion of the endoscope for large intestine insertion provided with a bending portion that can be bent by remote operation at the distal end portion of the flexible insertion portion covered with a flexible tube,
An insertion portion of an endoscope for large intestine insertion, wherein one or a plurality of ridges protrude from the outer surface of the bending portion.   2. The insertion portion of the endoscope for large intestine insertion according to claim 1, wherein the curved portion is covered with an elastic tube-shaped member, and the ridge is formed integrally with the tube-shaped member.   The large intestine insertion according to claim 1 or 2, wherein each of the ridges is formed so as to protrude in a direction around the axis of the curved portion, and one or a plurality of such ridges are provided at intervals in the axial direction of the curved portion. Endoscope insertion part.   The said each protruding item | line is projectingly formed in the direction parallel to the axis line of the said curved part, and one or more such protruding item | lines are provided in the surroundings direction of the axis line of the said curved part at intervals. The insertion part of the endoscope for large intestine insertion.   The protruding item | line which protruded and formed in the circumference direction of the axis of the said bending part and the protruding item | line protruding and formed in the direction parallel to the axis line of the said bending part are formed protrudingly on the outer surface of the said bending part. The insertion part of the endoscope for large intestine insertion.   The insertion part of the endoscope for large intestine insertion of Claim 1 or 2 with which the said protruding item | line is formed so that it may protrude helically from the outer surface of the said curved part.   The insertion portion of the endoscope for large intestine insertion according to any one of claims 1 to 6, wherein each of the ridges is formed in a shape divided in the middle.   The insertion portion of the endoscope for large intestine insertion according to any one of claims 1 to 7, wherein the protruding line is formed only in the vicinity of the distal end of the bending portion.   The insertion part of the endoscope for large intestine insertion according to any one of claims 1 to 7, wherein the convex line is formed on the entire curved part.

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