JP2009089725A - Separate type endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separate type endoscope which enables the accurate and easier arraying of the distal end of an insertion tube into a sheath tip part. <P>SOLUTION: The separate type endoscope includes an endoscope sheath 21 having tube parts 28 and 29 which are inserted through a sheath body 22 with the tip parts thereof connected to the sheath tip part 23 and an engagement receiving part 51 provided at the sheath tip part 23, its main body 33 having the insertion tube 34 insertable through the sheath body 22, and a positioning member 48 to be disposed at the tip part of the insertion tube 34 having an engaging part 48 which is engaged with the engagement receiving part 51 to position the tip part of the insertion tube 34 with the sheath tip part 23 and a guide part 49 which is made slidable along the length of the tube parts 28 and 29 on the outer circumferential surfaces of the tube parts 28 and 29 while getting the positioning member 48 held relative to the tube parts 28 and 29 in the arrangement of making the engaging part 48 engageable with the engagement receiving part 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a separation type endoscope in which an endoscope sheath and an endoscope main body are combined.

  When using a separate endoscope, the insertion portion of the endoscope body is inserted from the proximal end side into the endoscope sheath, and the endoscope sheath is detachably attached to the endoscope body. ing. An observation window or the like is disposed at the distal end portion of the distal end portion of the endoscope sheath, and an imaging unit or the like corresponding to the distal end portion of the insertion portion is disposed behind the observation window. The insertion portion is inserted into the body cavity together with the endoscope sheath while being accommodated in the endoscope sheath, and observation with a separate endoscope is performed. In an ordinary endoscope, it is necessary to clean and disinfect the entire endoscope every time it is used in order to prevent infections and the like. On the other hand, in the separation type endoscope, it is possible to omit the cleaning and disinfection of the insertion portion by making the endoscope sheath an inexpensive configuration and disposing it after use.

Patent Document 1 discloses a cover-type endoscope. In this cover-type endoscope, an objective lens cover is disposed at a distal end cover as a sheath distal end portion, and an insertion portion objective lens is disposed behind the objective lens cover. For this purpose, the front end cover is provided with a front fitting portion and a rear fitting portion having a diameter larger than that of the front fitting portion in order in the axial direction behind the objective lens. Thus, the distal end portion of the insertion portion is inserted into the front fitting portion and fitted. Furthermore, a recess is formed in the front fitting portion, and a protrusion is formed on the outer peripheral surface of the distal end portion of the insertion portion. By fitting the protrusion in the recess portion, the distal end portion of the insertion portion is positioned with respect to the tip cover. And fixed. In addition, an inclined guide step is formed between the front fitting portion and the rear fitting portion, and when the distal end portion of the insertion portion is inserted into the front fitting portion, the insertion portion As the projections are guided, the insertion portion is rotated about its central axis, and the projections are aligned with the recesses in the circumferential direction.
JP 7-303598 A

  In the separation type endoscope, since the long insertion portion is inserted from the proximal end side into the long and thin endoscope sheath, the distal end portion of the insertion portion is inserted into the distal end portion of the sheath. Is difficult to place accurately and easily.

  In the cover-type endoscope of Patent Document 1, since the protrusion is aligned with the recess of the tip cover by guiding the protrusion of the insertion portion at the guide step of the tip cover, the recess and the protrusion are reliably aligned. Is difficult, the insertion resistance increases, and the insertion portion is twisted, which makes the insertion operation troublesome. For this reason, even with the cover-type endoscope of Patent Document 1, it is difficult to accurately and easily arrange the distal end portion of the insertion portion with respect to the sheath distal end portion.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a separation-type endoscope that can accurately and easily arrange the distal end portion of the insertion portion with respect to the sheath distal end portion. Is to provide.

  In the first embodiment of the present invention, the separable endoscope includes a cylindrical sheath body, a sheath tip provided at the tip of the sheath body, and a tube portion inserted through the sheath body. An endoscope sheath having a tube portion in which the distal end portion of the tube portion is connected to the sheath distal end portion, and an engagement receiving portion provided in the sheath distal end portion; An insertion portion that is insertable, an endoscope body having an insertion portion provided with an imaging portion at a distal end portion of the insertion portion, and a positioning member provided at the distal end portion of the insertion portion, An engagement portion that is engaged with the engagement receiving portion to position the distal end portion of the insertion portion with respect to the sheath distal end portion, and the positioning member is engaged with the engagement receiving portion with respect to the tube portion. The pipe on the outer peripheral surface of the pipe part while holding the joint part in an engageable arrangement Characterized by including longitudinally slidable guide section, a positioning member having, a.

  In the second embodiment of the present invention, in the separation type endoscope, the engaging portion is formed by the entire positioning member, and the engaging receiving portion is formed on the proximal end side of the sheath distal end portion. And an engaging recess into which the entirety of the positioning member is engaged.

  In a third embodiment of the present invention, in the separation type endoscope, the engaging portion has a tapered portion having a tapered shape whose diameter decreases from a proximal end side to a distal end side of the positioning member, and the engagement The receiving portion has a taper receiving portion having a tapered shape whose diameter decreases from the proximal end side to the distal end side of the sheath distal end portion, and the tapered portion is slidable in the taper receiving portion. And

  In a fourth embodiment of the present invention, in the separate endoscope, the positioning member has a first fitting portion, and the sheath distal end portion is fitted into the first fitting portion, and It has the 2nd fitting part which fixes the said positioning member with respect to a sheath front-end | tip part, It is characterized by the above-mentioned.

  In the fifth embodiment of the present invention, in the separation type endoscope, one of the first and second fitting portions has a claw portion, and the first and second fitting portions are provided. The other fitting part among the parts has a hole.

  In a sixth embodiment of the present invention, in the separation type endoscope, one of the first and second fitting portions has an elastic protrusion, and the first and second fittings are provided. The other fitting part in the joint part has a fitting concave part.

  In a seventh embodiment of the present invention, in the separation type endoscope, the guide portion has a guide surface portion having a shape corresponding to at least a part of an outer peripheral surface of the tube portion, and the first fitting portion is The second fitting portion is formed by the guide surface portion, and has a diameter-enlarged portion that is provided at a tip portion of the tube portion and has a larger diameter than other portions of the tube portion. To do.

  In the separation type endoscope according to the first embodiment of the present invention, when the distal end portion of the insertion portion is inserted into the sheath body, positioning is performed while the engagement receiving portion is engaged with the engagement portion. The member is moved from the proximal end side to the distal end side along the tube portion, and the engagement portion is engaged with the engagement receiving portion, whereby the distal end portion of the insertion portion is positioned with respect to the sheath distal end portion. The In this way, the distal end portion of the insertion portion can be accurately and easily disposed with respect to the sheath distal end portion.

  In the separation type endoscope according to the second embodiment of the present invention, since the entire positioning member is engaged with the engagement recess, the distal end portion of the insertion portion can be reliably positioned.

  In the separation type endoscope according to the third embodiment of the present invention, the taper portion is slid in the taper receiving portion, and the engaging portion is guided to the engagement receiving portion. For this reason, even if it is a case where the engaging part is arranged slightly deviated from the position where the engaging part can be engaged with the engaging receiving part, the engaging part is smoothly engaged with the engaging receiving part. Is possible.

  In the separation type endoscope according to the fourth embodiment of the present invention, it is possible to fix the distal end portion of the insertion portion to the sheath distal end portion by fixing the positioning member to the sheath distal end portion. .

  In the separation type endoscope according to the fifth embodiment of the present invention, the positioning member is fixed to the sheath distal end portion by fitting the claw portion into the hole portion.

  In the separation type endoscope according to the sixth embodiment of the present invention, the positioning member is fixed to the sheath distal end portion by elastically deforming the elastic projection portion and fitting it into the fitting recess.

  In the separation type endoscope according to the seventh embodiment of the present invention, the positioning member is fixed to the distal end portion of the sheath by fitting the guide surface portion to the enlarged diameter portion of the distal end portion of the tube portion. Thus, the structure of the positioning member can be simplified by using the guide surface portion used for guiding the positioning member also for fixing the positioning member.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show a first embodiment of the present invention.

  Referring to FIG. 1, an endoscope sheath 21 of a separation type endoscope has a thick disc-shaped sheath distal end portion 23. A transparent observation window 24 is disposed at the sheath distal end portion 23. Further, an air supply nozzle 25 and a water supply nozzle 26 directed to the observation window 24 are disposed on the distal end side of the sheath distal end portion 23, and a channel opening 27 is formed in the sheath distal end portion 23. A step is formed in the outer peripheral portion of the sheath distal end portion 23 over the entire circumference, and the proximal end side 23a of the sheath distal end portion 23 is smaller in diameter than the distal end side. The proximal end side 23 a of the sheath distal end portion 23 is covered with the distal end portion of a long and flexible cylindrical sheath body 22. The proximal end side 23 a of the sheath distal end portion 23 is connected to the distal end portions of a circular air supply tube 28, a water supply tube 29, and a channel tube 30 as a tube portion, and the air supply tube 28, the water supply tube 29. The channel tube 30 is connected to an air supply nozzle 25, a water supply nozzle 26, and a channel opening 27, respectively. The air supply tube 28, the water supply tube 29, and the channel tube 30 are inserted into the sheath body 22 and extend from the proximal end opening of the sheath body 22. A branch tube 31 extends from the channel tube 30 at the proximal end portion 22 a of the sheath body 22, and the branch tube 31 projects from the proximal end portion 22 a of the sheath body 22. It is connected to the inner end. The channel tube 30 is used for both suction and insertion of the treatment instrument.

  The endoscope main body 33 of the separation type endoscope has an elongated insertion portion 34 that is inserted into the sheath main body 22 of the endoscope sheath 21. In the insertion portion 34, a rigid distal end rigid portion 35, a bending portion 36 that is operated to bend, and a long and flexible flexible tube portion 37 are sequentially provided from the distal end side. Here, the distal end rigid portion 35 incorporates an imaging portion 38. The imaging unit 38 is formed of an illumination unit that generates illumination light and an imaging unit that captures an observation image. The proximal end portion of the insertion portion 34 is coupled to a sheath connection portion 39 to which the proximal end portion 22a of the sheath body 22 is detachably connected. The sheath connection portion 39 is provided with an air supply base 41, a water supply base 42, and a suction base 43 to which the air supply tube 28, the water supply tube 29, and the channel tube 30 of the endoscope sheath 21 are connected, respectively. Has been. An operation unit 44 is coupled to the proximal end portion of the sheath connection portion 39. The operation section 44 is provided with a bending operation knob 45 for operating the bending section 36 and various buttons 46 for operating an air supply operation, a water supply operation, a suction operation, and an imaging operation. A universal cord 47 extends from the operation unit 44, and the universal cord 47 is connected to various peripheral devices for air supply, water supply, suction, and imaging.

  With reference to FIG.2 and FIG.3, the structure for arrange | positioning the front-end | tip part of the insertion part 34 correctly and easily with respect to the sheath front-end | tip part 23 is demonstrated.

  A thick plate-like positioning member 48 oriented in a direction perpendicular to the longitudinal direction of the insertion portion 34 is connected to the distal end portion of the insertion portion 34 of the endoscope body 33. That is, an attachment hole 50 a is formed through the attachment portion 50 of the positioning member 48, and the insertion portion 34 is inserted into the attachment hole 50 a and fixed to the positioning member 48. The positioning member 48 includes an extending portion 49 that extends in a forked manner from the outer peripheral portion of the attachment portion 50 in the radial direction of the insertion portion 34. On the other hand, on the proximal end side of the sheath distal end portion 23 of the endoscope sheath 21, an engagement concave portion 51 is formed as an engagement receiving portion having substantially the same shape as the entire positioning member 48. By engaging the entire positioning member 48 as an engaging portion with the engaging recess 51, the distal end portion of the insertion portion 34 is positioned with respect to the sheath distal end portion 23, and the rear of the observation window 24 of the sheath distal end portion 23. The imaging unit 38 of the insertion unit 34 is appropriately arranged.

  Further, in the positioning member 48, first and second guide holes 52 a and 52 b as guide portions are penetrated in the longitudinal direction of the insertion portion 34 on the extending end side of the extending portion 49. In the cross section orthogonal to the longitudinal direction of the insertion portion 34, the surfaces defining the first and second guide holes 52a and 52b have circular shapes having substantially the same diameter as the outer peripheral surfaces of the air supply tube 28 and the water supply tube 29, respectively. The air supply tube 28 and the water supply tube 29 can be inserted into the first and second guide holes 52a and 52b, respectively. In the cross section perpendicular to the longitudinal direction of the insertion portion 34, the relative arrangement of the first guide hole 52 a and the second guide hole 52 b is relative to the air supply tube 28 and the water supply tube 29 at the sheath distal end portion 23. The relative arrangement of the first and second guide holes 52a and 52b and the overall shape of the positioning member 48 is determined by the engagement between the air supply tube 28 and the water supply tube 29 at the sheath distal end 23 and the engagement recess. This corresponds to a relative arrangement with the overall shape of 51. Here, with respect to the air supply tube 28, the water supply tube 29, and the channel tube 30, the relative arrangement of the sheath distal end portion 23 over the entire length of the sheath main body 22 in the sheath main body 22 by pulling the proximal end portions thereof It is possible to have substantially the same relative arrangement. By inserting the air supply tube 28 and the water supply tube 29 having such a relative arrangement into the first and second guide holes 52a and 52b as guide portions of the positioning member 48, respectively, the air supply tube 28 and the water supply tube 29 are inserted. On the other hand, the positioning member 48 can be held in an arrangement in which the entire positioning member 48 can be engaged with the engaging recess 51 of the sheath distal end portion 23. The positioning member 48 can slide in the longitudinal direction of the air supply tube 28 and the water supply tube 29 on the outer peripheral surfaces of the air supply tube 28 and the water supply tube 29 while maintaining such an arrangement.

  Next, a combination method of the separation type endoscope according to the present embodiment will be described.

  The first and first positioning members 48 connected to the distal end portion of the insertion portion 34 are respectively connected to the proximal end portions of the air supply tube 28 and the water supply tube 29 extending from the proximal end portion of the endoscope sheath 21. The second guide holes 52a and 52b are inserted. Then, by pulling the proximal ends of the air supply tube 28, the water supply tube 29, and the channel tube 30, the air supply tube 28, the water supply tube 29, and the channel tube 30 are placed in the sheath body 22 over the entire length of the sheath body 22. The relative arrangement is substantially the same as the relative arrangement at the tip portion 23. Subsequently, when the insertion portion 34 is pushed into the sheath body 22, the positioning member 48 is slid from the proximal end side to the distal end side along the air supply tube 28 and the water supply tube 29, and is inserted into the sheath body 22. The tip of the portion 34 is inserted. At this time, the positioning member 48 is held with respect to the water supply tube 29 and the air supply tube 28 so that the entire positioning member 48 can be engaged with the engagement recess 51 of the sheath distal end portion 23. Accordingly, when the insertion portion 34 is further pushed into the sheath body 22, the entire positioning member 48 is inserted into the engagement recess 51 of the sheath distal end portion 23 and engaged therewith. As a result, the distal end portion of the insertion portion 34 is positioned with respect to the sheath distal end portion 23, and the imaging unit 38 of the insertion portion 34 is appropriately disposed behind the observation window 24 of the sheath distal end portion 23. Thereafter, the base ends of the air supply tube 28, the water supply tube 29, and the channel tube 30 are connected to the air supply base 41, the water supply base 42, and the suction base 43 of the endoscope main body 33, and the base end portion of the sheath main body 22 is connected. Is connected to the sheath connecting portion 39 of the endoscope main body 33.

  Therefore, the separation type endoscope according to this embodiment has the following effects.

  In the separation type endoscope according to the present embodiment, when the distal end portion of the insertion portion 34 is inserted into the sheath main body 22, positioning is performed while the entire positioning member 48 is engaged with the engagement recess 51. The member 48 is moved from the proximal end side to the distal end side along the air supply tube 28 and the water supply tube 29, and the entire positioning member 48 is engaged with the engagement recess 51, so that the sheath distal end portion 23 is engaged. In contrast, the distal end portion of the insertion portion 34 is positioned. In this way, the distal end portion of the insertion portion 34 can be accurately and easily disposed with respect to the sheath distal end portion 23. In particular, since the entire positioning member 48 is engaged with the engaging recess 51, the distal end portion of the insertion portion 34 can be reliably positioned.

  FIG. 4 shows a second embodiment of the present invention.

  In the positioning member 48 of the present embodiment, a tapered portion 53 having a tapered shape whose diameter decreases from the proximal end side to the distal end side is formed on the distal end side peripheral portion of the positioning member 48. On the other hand, a taper receiving portion 54 having a tapered shape that is reduced in diameter from the proximal end side to the distal end side is formed at the proximal end peripheral edge portion of the engaging recess 51 of the sheath distal end portion 23. When the positioning member 48 is inserted into the engagement recess 51, the taper portion 53 is slid in the taper receiving portion 54, and the positioning member 48 is guided to the engagement recess 51. For this reason, even when the positioning member 48 is inserted with a slight displacement relative to the engaging recess 51, the positioning member 48 can be smoothly inserted into and engaged with the engaging recess 51. ing.

  FIG. 5 shows a third embodiment of the present invention.

  A pair of claw portions 55 project from the proximal end surface of the sheath distal end portion 23 of the present embodiment, and a pair of hole portions 56 are formed on the outer peripheral surface of the positioning member 48. When the positioning member 48 is engaged with the engaging recess 51 of the sheath distal end portion 23, the claw portion 55 is fitted into the hole portion 56, and the positioning member 48 is fixed to the sheath distal end portion 23. In this way, the distal end portion of the insertion portion 34 can be fixed to the sheath distal end portion 23.

  FIG. 6 shows a modification of the third embodiment of the present invention.

  In the present modification, a pair of claw portions 55 are projected from the proximal end surface of the positioning member 48, and a pair of hole portions 56 are formed on the inner peripheral surface of the engagement concave portion 51 of the sheath distal end portion 23. Even in this case, the distal end portion of the insertion portion 34 can be fixed to the sheath distal end portion 23.

  FIG. 7 shows a fourth embodiment of the present invention.

  A pair of elastic projections 57 having elasticity are disposed on the inner peripheral surface of the engaging recess 51 of the sheath distal end portion 23 of the present embodiment, and the outer surface of the elastic projection 57 is an elastic having a predetermined curvature R. A pressing surface is formed. On the other hand, a pair of fitting recesses 58 are formed on the outer peripheral surface of the positioning member 48, and the fitting recess 58 forms a V-groove extending in the circumferential direction and having a V-shaped cross section at the bottom. When the positioning member 48 is engaged with the engaging recess 51 of the sheath tip 23, the elastic protrusion 57 is compressed and deformed and fitted into the fitting recess 58, and the positioning member 48 is against the sheath tip 23. Is fixed. In this way, the distal end portion of the insertion portion 34 can be fixed to the sheath distal end portion 23.

  FIG. 8 shows a modification of the fourth embodiment of the present invention.

  In this modification, a pair of elastic protrusions 57 that form an elastic pressing surface are disposed on the outer peripheral surface of the positioning member 48, and a V-groove is formed on the inner peripheral surface of the engaging recess 51 of the sheath distal end portion 23. A pair of fitting recesses 58 to be formed is formed. Even in this case, the distal end portion of the insertion portion 34 can be fixed to the sheath distal end portion 23.

  9 and 10 show a fifth embodiment of the present invention.

  In the positioning member 48 of the present embodiment, in order to form a guide surface portion on the extended end portion side of the extended portion 49, a guide concave portion in addition to the first and second guide holes 52 a and 52 b is used as a guide portion. 59 extends in the longitudinal direction of the insertion portion 34. In the cross section orthogonal to the longitudinal direction of the insertion portion 34, the radii of the first and second guide holes 52a and 52b are slightly larger than the radii of the air supply tube 28 and the water supply tube 29, respectively. The surface defining the guide recess 59 has a ¼ circle shape with a radius of curvature slightly larger than the radius of the channel tube 30, and the channel tube 30 can be fitted into the guide recess 59. Further, the relative arrangement of the first guide hole 52 a, the second guide hole 52 b, and the guide recess 59 corresponds to the relative arrangement of the air supply tube 28, the water supply tube 29, and the channel tube 30 at the sheath distal end portion 23. In addition, the relative arrangement of the first and second guide holes 52a and 52b and the guide recess 59 and the overall shape of the positioning member 48 is such that the air supply tube 28, the water supply tube 29, and the channel tube 30 at the sheath distal end portion 23. Corresponds to the relative arrangement of the engagement recess 51 and the overall shape. In addition to inserting the air supply tube 28 and the water supply tube 29 into the first and second guide holes 52a and 52b, respectively, the channel tube 30 is fitted into the guide recess 59, so that the entire positioning member 48 is fitted to the sheath tip. The positioning member 48 is disposed on the outer circumferential surface of the air supply tube 28, the water supply tube 29, and the channel tube 30, while maintaining the disposition capable of engaging with the engagement recess 51 of the portion 23. The channel tube 30 is slidable in the longitudinal direction.

  At the tip of the air supply tube 28, the water supply tube 29, and the channel tube 30, a thin short cylindrical first to third diameter-expanding member having external elasticity is fitted and fixed, respectively, than the other parts. First to third enlarged diameter portions 61a, 61b, 61c having a large outer diameter are formed. The radii of the first to third enlarged diameter portions 61a, 61b, 61c are slightly larger than the radii of the first and second guide holes 52a, 52b and the curvature radius of the guide recess 59, respectively.

  Next, a combination method of the separation type endoscope according to the present embodiment will be described.

  When the insertion portion 34 is pushed into the sheath body 22, the positioning member 48 connected to the distal end portion of the insertion portion 34 moves from the proximal end side to the distal end side along the air supply tube 28, the water supply tube 29 and the channel tube 30. The distal end portion of the insertion portion 34 is inserted into the sheath body 22. Appropriate clearances are formed between the air supply tube 28, the water supply tube 29, and the channel tube 30, and the first guide hole 52a, the second guide hole 52b, and the guide recess 59, respectively. It becomes small and can insert the front-end | tip part of the insertion part 34 smoothly. When the positioning member 48 is inserted and engaged with the engaging recess 51 of the sheath distal end portion 23, the first to third diameter-expanded portions 61a of the distal ends of the air supply tube 28, the water supply tube 29, and the channel tube 30 are used. , 61b, 61c are fitted and fixed to the first and second guide holes 52a, 52b and the guide recess 59, respectively, and the positioning member 48 is fixed to the sheath distal end portion 23. Since the insertion resistance increases at the time of fitting, the insertion end position can be accurately grasped, and the insertion portion 34 is prevented from being pushed more than necessary. In this way, the distal end portion of the insertion portion 34 is fixed to the sheath distal end portion 23.

  Therefore, the separation type endoscope according to this embodiment has the following effects.

  In the separation type endoscope according to the present embodiment, the first and second guide holes 52 a and 52 b and the guide recess 59 used for guiding the positioning member 48 are also used for fixing the positioning member 48. The configuration can be simplified.

The perspective view which shows the separation type endoscope of 1st Embodiment of this invention. The perspective view which shows the front-end | tip part of the separation type endoscope of 1st Embodiment of this invention. 1 is a cross-sectional view illustrating a distal end portion of a separation type endoscope according to a first embodiment of the present invention. The perspective view which shows the front-end | tip part of the separation type endoscope of 2nd Embodiment of this invention. The perspective view which shows the front-end | tip part of the separation type endoscope of 3rd Embodiment of this invention. The perspective view which shows the front-end | tip part of the separation-type endoscope of the modification of 3rd Embodiment of this invention. The perspective view which shows the front-end | tip part of the separation type endoscope of 4th Embodiment of this invention. The perspective view which shows the front-end | tip part of the separation type endoscope of the modification of 4th Embodiment of this invention. The perspective view which shows the front-end | tip part of the separation type endoscope of 5th Embodiment of this invention. The transverse cross section which shows the tip part of the separation type endoscope of a 5th embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 21 ... Endoscope sheath, 22 ... Sheath main body, 23 ... Sheath tip part, 28, 29, 30 ... Tube part (28 ... Air supply tube, 29 ... Water supply tube, 30 ... Channel tube), 33 ... Endoscope main body , 34 ... insertion part, 38 ... imaging part, 48 ... positioning member; engaging part, 49 ... guide part, 51 ... engagement receiving part (engaging recess), 53 ... taper part, 54 ... taper receiving part, 55; 57; 52a, 52b, 59 ... 1st fitting part (55 ... nail | claw part, 57 ... elastic projection part, 52a ... guide surface part (1st guide hole), 52b ... guide surface part (2nd guide hole), 59 ... Guide surface portion (guide recess)), 56; 58; 61a, 61b, 61c ... Second fitting portion (56 ... hole, 58 ... fitting recess, 61a ... first enlarged diameter portion, 61b ... first 2 enlarged diameter parts, 61c ... 3rd enlarged diameter part).

Claims (10)

A tubular sheath body, a sheath tip provided at the tip of the sheath body, and a tube portion inserted through the sheath body, the tip of the tube portion being connected to the sheath tip. An endoscope sheath having a tube portion and an engagement receiving portion provided at the distal end portion of the sheath;
An endoscope body having an insertion portion that can be inserted into the sheath body, and an insertion portion provided with an imaging portion at a distal end portion of the insertion portion;
A positioning member provided at a distal end portion of the insertion portion, the engagement portion engaging with the engagement receiving portion to position the distal end portion of the insertion portion with respect to the sheath distal end portion, and the tube portion The guide member is slidable in the longitudinal direction of the tube portion on the outer peripheral surface of the tube portion while holding the positioning member in an arrangement in which the engagement portion can be engaged with the engagement receiving portion. A positioning member;
A separation-type endoscope characterized by comprising: The engaging portion is formed by the entire positioning member,
The engagement receiving portion has an engagement recess formed on the proximal end side of the sheath distal end portion and engaged with the entire positioning member.
The separation type endoscope according to claim 1, wherein: The engaging portion has a tapered portion having a tapered shape that decreases in diameter from the proximal end side to the distal end side of the positioning member;
The engagement receiving portion has a taper receiving portion having a tapered shape whose diameter is reduced from the proximal end side to the distal end side of the sheath distal end portion,
The tapered portion is slidable at the tapered receiving portion,
The separation type endoscope according to claim 1, wherein: The positioning member has a first fitting portion,
The sheath tip has a second fitting portion that is fitted to the first fitting portion and fixes the positioning member to the sheath tip.
The separation type endoscope according to claim 1, wherein: One of the first and second fitting portions has a claw portion,
The other fitting part of the first and second fitting parts has a hole,
The separation type endoscope according to claim 4 characterized by things. One of the first and second fitting portions has an elastic protrusion,
The other fitting part of the first and second fitting parts has a fitting recess.
The separation type endoscope according to claim 4 characterized by things. The guide portion has a guide surface portion having a shape corresponding to at least a part of the outer peripheral surface of the tube portion,
The first fitting portion is formed by the guide surface portion,
The second fitting portion has a diameter-enlarged portion that is provided at a distal end portion of the tube portion and has a larger diameter than other portions of the tube portion.
The separation type endoscope according to claim 4 characterized by things.   The endoscope sheath of the separation type endoscope according to any one of claims 1 to 7.   The endoscope main body of the separation type endoscope according to any one of claims 1 to 7.   The positioning member of the separation type endoscope according to any one of claims 1 to 7.

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