JP5602001B2 - Endoscope and method of fixing skin to endoscope distal end - Google Patents

Description

  The present invention relates to an endoscope in which an outer skin is wound around and fixed to a distal end portion of an endoscope insertion portion.

  The insertion portion of the endoscope is covered with, for example, a rubber outer skin. At the distal end of the insertion portion, a distal end member that holds an imaging lens, an imaging element, and the like and is formed with an air / water feeding channel and a forceps channel is disposed, and the outer periphery thereof is covered with a skin to the vicinity of the distal end. A thread is wound around the end portion of the outer skin covering the tip member, and thereby the outer skin is fixed to the tip member. An adhesive is applied around the wound yarn, and the yarn is covered with the adhesive.

  However, since the part (wrapping part) covered with the adhesive has a slight rise, it becomes a burden on the patient when inserting the endoscope. For this reason, it has been attempted to form a deep groove in a portion corresponding to the winding portion of the tip member to eliminate the rise (see Patent Document 1). However, even with such a configuration, a slight step is generated at the boundary with the winding portion, and thus it cannot be said that the burden on the patient at the time of insertion is sufficiently reduced. On the other hand, in order to reduce a burden on a patient due to a step, there is also known a configuration in which a winding portion is tapered toward a distal end portion (see Patent Document 2).

JP 2002-102148 A JP 63-123011 A

  The configuration of Patent Literature 2 is more advantageous than the configuration of Patent Literature 1 in reducing the effect of steps. However, since it is necessary to wind the yarn from the base side toward the tip, if the winding portion is tapered toward the tip, the first winding is likely to be displaced toward the tip and wound. Work efficiency deteriorates.

  An object of the present invention is to reduce a burden on a patient due to a winding portion and improve a winding work efficiency in an endoscope in which a thread is wound around an outer skin and fixed to a distal end portion of an insertion portion.

  The endoscope of the present invention is formed along the outer peripheral surface of the distal end member that forms the distal end portion of the endoscope insertion portion, the outer skin that covers the outer side of the endoscope insertion portion, and the thread is wound around An outer skin mounting groove for fixing the terminal end of the outer skin, and the outer skin mounting groove has a positioning portion provided on the base side of the tip member and a taper portion provided on the tip side, and the width of the positioning portion is above the outer skin. It is characterized in that it is sized so that it can be wound more than once.

  The positioning portion is formed as a groove portion with respect to the flat portion or the tapered portion.

  The method of fixing the outer skin to the distal end of the endoscope insertion portion of the present invention is for fixing a terminal end portion of the outer skin of the endoscope insertion portion by winding a thread around the outer peripheral surface of the distal end member constituting the distal end portion of the endoscope. An outer skin mounting groove is formed, and in the outer skin mounting groove, a positioning portion is provided on the base side of the tip member and a taper portion is provided on the tip side, and at the positioning portion, one or more windings of the yarn are wound on the outer skin. .

  ADVANTAGE OF THE INVENTION According to this invention, in the endoscope which winds a thread | yarn around an outer skin and fixes to the front-end | tip part of an insertion part, while reducing the burden on the patient by a winding part, winding work efficiency can be improved.

It is sectional drawing of the endoscope front-end | tip part of 1st Embodiment. It is an enlarged view of the outer skin mounting groove of FIG. It is sectional drawing of the endoscope front-end | tip part of 2nd Embodiment. FIG. 4 is an enlarged view of the outer skin mounting groove of FIG. 3.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of the distal end of an endoscope insertion portion in the first embodiment of the present invention.

  The endoscope of the present embodiment is, for example, an electronic endoscope, and the distal end portion 10 holds the imaging element 11 and the imaging optical system 12 and is a distal end member 13 formed from a rigid material such as resin or ceramic. Consists of. The tip member 13 is provided with an air / water feed channel 14, a forceps channel 15, and the like, and the base of the tip member 13 is fitted into a node ring tube 16 connected to the bending piece. The node ring tube 16 and the bending piece are covered with a mesh tube 17, and the mesh tube 17 is covered with an outer skin 18 made of a rubber material or the like. The outer skin 18 also covers the vicinity of the distal end portion of the distal end member 13, and the end portion thereof is fixed to the distal end member 13.

  In the vicinity of the distal end portion of the distal end member 13, a skin mounting groove 19 is formed along the outer periphery. The outer skin mounting groove 19 includes a flat part (positioning part) 20 and a taper part 21, the flat part 20 is arranged on the base part side of the tip member 13, and the taper part 21 is arranged on the tip part side. The flat portion 20 is a region having a constant outer diameter along the axial direction of the endoscope, and the taper portion 21 is a region processed in a tapered shape from the flat portion 20 toward the tip.

  When the outer skin 18 is fixed to the tip member 13, the outer skin 18 is arranged so as to cover the outer skin mounting groove 19, and the thread 22 tapers from the base side of the flat portion 20 around the outer skin mounting groove 19 across the outer skin 18. 21 is wound around the tip side. When the winding of the yarn 22 is completed, the adhesive 23 is applied around the yarn 22, and the depression due to the outer skin mounting groove 19 is filled with the adhesive 23.

  FIG. 2 is an enlarged view of the outer skin mounting groove 19 of FIG. The width of the flat portion 20 along the axial direction is such that the yarn 22 can be wound one or more turns from the top of the outer skin 18 in the flat portion 20. As shown in FIG. 2, in this embodiment, the width of the flat portion 20 is, for example, two turns of the yarn 22 (a width that allows two turns in consideration of the thickness of the outer skin 18). Moreover, when the width along the axial direction of the groove around which the yarn 22 is wound is L, the width of the yarn 22 wound around the flat portion 20 is, for example, 1/5 times L. It should be noted that the depth of the outer skin mounting groove 19 is set so that the thread 22 is sufficiently contained in the groove.

  As described above, according to the first embodiment, by providing the flat portion on the base side in the outer skin mounting groove having the tapered portion, the yarn can be wound on the flat portion, and the position of the yarn at the start of the winding. Deviation can be prevented. As a result, the winding operation can be made more efficient while adopting a tapered shape for the winding portion for fixing the outer skin.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is an enlarged cross-sectional view of the distal end of the endoscope insertion portion in the second embodiment, and FIG. 4 is an enlarged view of the outer skin mounting groove of the second embodiment shown in FIG.

  The second embodiment is different from the first embodiment in the shape of the positioning portion provided on the tip member, but the other configuration is the same as that of the first embodiment. Therefore, the same reference numerals are used for the same configurations as in the first embodiment, and the description thereof is omitted.

  A distal end member 25 is provided at the distal end portion 24 of the second embodiment, and an outer skin mounting groove 26 for fixing the end portion of the outer skin 18 is formed along the outer periphery of the distal end member 25. The outer skin mounting groove 26 has a base-side fixed groove portion (positioning portion) 27 and a tip-side taper portion 28.

  The tapered portion 28 is a region formed in a tapered shape toward the tip, like the tapered portion 21 of the first embodiment. On the other hand, the fixed groove portion 27 is formed as a groove having a depth d from the base side of the tapered portion 28. The axial width of the fixed groove portion 27 is set to a size that allows one or more turns in the fixed groove portion 27 when the yarn 22 is wound from above the outer skin 18.

  As shown in FIG. 4, in this embodiment, the width of the fixing groove 27 is, for example, two turns of the yarn 22 (a width that allows two turns in consideration of the thickness of the outer skin 18). When the width along the axial direction of the groove in which the yarn 22 is wound is L, the width of the yarn 22 wound in the fixed groove portion 27 is, for example, 1/5 times L.

  As described above, also in the second embodiment, the same effect as in the first embodiment can be obtained. In the second embodiment, since the positioning portion is a groove deeper than the taper portion, it is possible to more reliably prevent the yarn from shifting when starting the winding.

  In addition, in the conventional configuration in which the outer skin mounting groove is composed only of the tapered portion, a gap may be generated between the base side corner of the outer skin mounting groove and the outer skin due to the positional deviation of the thread, and fixing may become unstable. However, in this embodiment, since the yarn does not deviate from the positioning portion, the generation of such a gap can be prevented, and the outer skin can be more firmly fixed to the tip member.

  In addition, the shape of the fixed groove part of 2nd Embodiment is not limited to this embodiment, For example, the shape which has the curved shape and the bottom face with the inclination may be sufficient. In this embodiment, the electronic endoscope has been described as an example, but the present invention can also be applied to a fiberscope.

10, 24 Tip part 13, 25 Tip member 18 Skin 19, 26 Skin mounting groove 20 Flat part (positioning part)
21, 28 Tapered portion 22 Thread 23 Adhesive 27 Fixed groove portion (positioning portion)

Claims (4)

A tip member constituting the tip of the endoscope insertion portion;
An outer skin covering the outside of the endoscope insertion portion;
A skin mounting groove formed along the outer peripheral surface of the tip member and wound around a thread to fix the terminal portion of the skin;
Wherein a positioning portion provided on the base side and a tapered portion provided on the distal end side of the tip member to the outer skin attachment groove is provided, the width of the positioning portion, the size can be the yarn 1 wound or from the top of the outer skin An endoscope characterized by the above.   The endoscope according to claim 1, wherein the positioning portion is formed as a groove portion with respect to a flat portion or a tapered portion. Forming an outer skin mounting groove for fixing a terminal portion of the outer skin of the endoscope insertion portion by winding a thread around the outer peripheral surface of the distal end member constituting the distal end portion of the endoscope,
In the outer skin mounting groove, a positioning portion is provided on the base side of the tip member and a taper portion is provided on the tip side,
In the positioning part, the thread is wound one or more times from above the outer skin. The endoscope according to any one of claims 1 and 2, wherein the depth of the outer skin mounting groove is set to a depth at which the wound thread is accommodated in the outer skin mounting groove.

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