JP2018117872A - Distal part structure of endoscope insertion section and endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distal part structure of an endoscope insertion section, the distal part structure allowing a pipe member to be securely fixed to a distal end body of the endoscope insertion section and which, at the time of repair, allowing the pipe member to be easily removed from the distal end body, and also provide an endoscope having such a distal part structure of an endoscope insertion section.SOLUTION: According to the present invention, a protrusion 106 of a clamp pipe 102 is engaged with a positioning groove 124 of a distal end body 48 to regulate the rotation of the clamp pipe 102 about a center axis with respect to a fitting hole 82. Further, according to the invention, a screw 132 is engaged with a screw receiving hole 108 of the clamp pipe 102 to regulate the position of the clamp pipe 102 in a direction of the center axis with respect to the fitting hole 82. The screw 132 is screwed into a screw hole 130 formed in the distal end body 48. The screw hole 130 is formed from the fitting hole 82 to an outer surface 48B of the distal end body 48.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a distal end structure of an endoscope insertion portion and an endoscope, and more particularly to a distal end structure of an endoscope insertion portion and an endoscope for fixing a pipe member to a distal end main body of the endoscope insertion portion. About.

  An endoscope insertion portion (hereinafter referred to as an insertion portion) is configured by connecting a flexible portion, a bending portion, and a distal end hard portion from the proximal end side toward the distal end side. In addition, a plurality of insertion members such as a treatment instrument insertion tube, a light guide, an air / water supply tube, an image guide, or a signal cable are inserted in the insertion portion, and the distal end side of these insertion members is hard at the distal end. It is fixed to the tip end body of the part.

  For example, a treatment instrument insertion tube, light guide, or air / water supply tube has a pipe or base fixed to each distal end, and the pipe or base is inserted into a mounting hole or a groove formed in the distal end body. To be fixed. In addition, a lens barrel holding an optical system is connected to the distal end side of the image guide, and an imaging optical system having a lens barrel holding the optical system is connected to the distal end side of the signal cable. These lens barrels are inserted into and fixed to the mounting holes or concave grooves of the tip body. Since the pipe, the base, and the lens barrel described above are all pipe-shaped members, the pipe, the base, and the lens barrel may be collectively referred to as a pipe member in the present specification.

  Patent Documents 1 and 2 disclose the distal end structure of an endoscope insertion portion for fixing the pipe member of the insertion member to the distal end portion main body of the distal end hard portion.

  In Patent Document 1, the distal end side of a forceps tube (corresponding to an insertion member) is fixed to a forceps hole (corresponding to a mounting hole) of a main body (corresponding to a distal end main body) of a distal end component (corresponding to a distal end hard portion). A tip structure is disclosed. Specifically, a hard part (corresponding to a pipe member) is formed on the distal end side of the forceps tube, and after the hard part is fitted into the forceps hole, the hard part is fixed to the main body with a set screw. The main body of Patent Document 1 has a screw hole penetrating from the forceps hole to the outer surface of the main body, and a set screw is screwed into the screw hole. According to Patent Document 1, by screwing a set screw into the hard part and pressing it against the hard part, the rotation around the central axis of the hard part with respect to the forceps hole and the position of the hard part in the central axis direction with respect to the forceps hole are regulated. Yes.

  On the other hand, in Patent Literature 2, a treatment instrument insertion pipe (corresponding to a pipe member) of a treatment instrument insertion channel (corresponding to a treatment instrument insertion tube) is fixed to a holding portion (corresponding to a distal end portion main body) of a distal end hard portion. A tip structure is disclosed. In the holding part of Patent Document 2, a groove is formed radially inward from the outer peripheral surface side, and the treatment instrument insertion pipe is inserted into the groove from the outside in the radial direction of the holding part. In addition, a protrusion is formed on the outer peripheral surface of the treatment instrument insertion pipe, and a recess into which the protrusion is fitted is provided at the groove bottom of the groove. That is, Patent Document 2 discloses a tip portion structure in which a treatment instrument insertion pipe is inserted into a concave groove from the outside in the radial direction of the holding portion, and a protrusion of the treatment instrument insertion pipe is fitted into the concave portion of the concave groove. . According to Patent Document 2, by fitting the protrusion into the concave portion, the rotation around the central axis of the treatment instrument insertion pipe with respect to the concave groove and the axial position of the treatment instrument insertion pipe with respect to the concave groove are regulated. .

  As described above, the conventional distal end structure of the endoscope insertion portion is such that the pipe member fixed to the distal end side of the insertion member is fixed to the distal end portion main body with a screw (see Patent Document 1), or the outer peripheral surface of the pipe member. In general, the pipe member is fixed to the tip body by engaging the convex portion formed in the concave portion of the concave groove (see Patent Document 2).

JP 2000-325297 A JP 2001-83436 A

  However, it is particularly difficult to increase the fixing strength in the rotational direction around the central axis of the pipe member with respect to the mounting hole in the tip portion structure as in Patent Document 1. In other words, in order to increase the fixing strength in the rotational direction, it is necessary to increase the screw tightening force (also referred to as axial force). However, if the screw tightening force is increased, the pipe member is deformed or damaged by the force. It is because it does. Due to such a problem, in the tip portion structure of Patent Document 1, it is difficult to increase the screw tightening force, and it is difficult to increase the fixing strength of the pipe member in the rotation direction. Therefore, in the front-end | tip part structure of patent document 1, when the force of the rotation direction was added to the pipe member, there existed a problem that a pipe member would rotate easily with respect to a mounting hole.

  On the other hand, the distal end structure of Patent Document 2 is a structure in which a treatment instrument insertion pipe is inserted into the groove from the outside in the radial direction of the holding section, and the protrusion of the treatment instrument insertion pipe is fitted into the recess of the groove. In other words, the distal end portion structure of Patent Document 2 inserts the treatment instrument insertion pipe into the concave groove by relatively moving the holding portion and the treatment instrument insertion pipe in a direction orthogonal to the axial direction of the treatment instrument insertion pipe. In this structure, the protrusion is fitted into the recess. In other words, the distal end structure of Patent Document 2 is configured so that the treatment instrument can be inserted from the holding section unless the holding section and the treatment instrument insertion pipe are relatively retracted in a direction orthogonal to the axial direction of the treatment instrument insertion pipe. The structure is such that the pipe cannot be removed.

  Here, when repairing the distal end hard portion of the insertion portion, an operation of removing the pipe member from the distal end portion main body is performed.In this case, if the pipe member can be pulled out in the axial direction of the pipe member, the removal operation of the pipe member is performed. It becomes easy. However, since the protrusion of the treatment instrument insertion pipe is fitted in the recess of the concave groove, the distal end structure of Patent Document 2 is drawn out in the axial direction of the treatment instrument insertion pipe with respect to the holding portion. I can't. In other words, the distal end structure of Patent Document 2 is configured so that the treatment instrument insertion pipe is moved from the holding section unless the holding section and the treatment instrument insertion pipe are relatively retracted in the direction orthogonal to the axial direction of the treatment instrument insertion pipe. It cannot be removed. Therefore, the tip portion structure of Patent Document 2 has a problem that the pipe member cannot be easily detached from the tip portion main body at the time of repair.

  The present invention has been made in view of such circumstances, and the pipe member can be easily detached from the distal end portion main body at the time of repair while securely fixing the pipe member to the distal end main body of the endoscope insertion portion. It aims at providing the tip part structure of an endoscope insertion part, and an endoscope.

  In order to achieve the object of the present invention, the present invention is provided on the distal end side of a distal end main body provided on the distal end side of the endoscope insertion portion and the insertion member inserted in the endoscope insertion portion. A pipe member, an opening formed in the base end surface of the tip body, a mounting hole in which the pipe member is mounted, a rotation restricting portion that restricts rotation of the pipe member around the central axis with respect to the mounting hole, and a pipe to the mounting hole An axial direction restricting portion for restricting the position of the member in the central axis direction, and the rotation restricting portion is provided on the projecting portion provided on the outer peripheral surface of the pipe member and on the inner peripheral surface of the mounting hole. A positioning groove having a shape corresponding to the outer shape, and by engaging the protrusion and the positioning groove, the rotation around the central axis of the pipe member with respect to the mounting hole is regulated. The engagement hole provided on the outer peripheral surface of the member and the mounting hole A through hole formed from the peripheral surface to the outer surface of the tip body, and by inserting the shaft member through the through hole and engaging the shaft member with the engagement hole, the center of the pipe member with respect to the mounting hole Provided is a distal end structure of an endoscope insertion portion that regulates an axial position.

  According to the distal end structure of the endoscope insertion portion of the present invention, the protrusion is engaged with the positioning groove having a shape corresponding to the outer shape of the protrusion, thereby restricting the rotation of the pipe member around the central axis with respect to the mounting hole. Therefore, even if a rotational force is applied to the pipe member, it is possible to reliably prevent the pipe member from being displaced in the rotational direction with respect to the mounting portion. In addition, according to the present invention, the shaft member is engaged with the engagement hole of the pipe member, and the position of the pipe member in the central axis direction with respect to the mounting hole is regulated. In addition, it is possible to reliably prevent the pipe member from being displaced in the removal direction with respect to the mounting hole. In this case, since it is only necessary to engage the shaft member with the engagement hole, the position of the pipe member in the central axis direction with respect to the mounting hole can be regulated without applying a large axial force to the shaft member. Therefore, deformation or damage of the pipe member caused by applying a large axial force from the shaft member to the pipe member can be prevented. Furthermore, according to the present invention, when repairing the tip body, the pipe member can be pulled out from the mounting hole along the central axis simply by loosening the shaft member and retracting the shaft member from the engagement hole.

  Therefore, according to the present invention, the pipe member can be easily detached from the tip end body during repairing while the pipe member is securely fixed to the tip end body.

  In one aspect of the present invention, the pipe member is preferably provided on the distal end side of the insertion member through which the treatment tool is inserted into the insertion member.

  According to one aspect of the present invention, the pipe member of the insertion member through which the treatment tool is inserted can be reliably fixed to the distal end portion main body, and the pipe member can be easily detached from the distal end portion main body at the time of repair.

  In one aspect of the present invention, it is preferable that a mounting hole for a built-in object attached to the tip body is formed in the tip body, and the positioning groove communicates with the mounting hole.

  According to one aspect of the present invention, a part of the protrusion engaged with the positioning groove can be accommodated in the mounting hole. The diameter can be suppressed.

  In one embodiment of the present invention, the attachment hole is preferably an attachment hole for attaching the imaging optical system.

  According to one aspect of the present invention, a part of the protrusion engaged with the positioning groove can be accommodated in a dead space excluding a space where the imaging optical system is arranged in the space of the attachment hole.

  In one embodiment of the present invention, the through hole is preferably a screw hole, and the shaft member is preferably a screw screwed into the screw hole.

  According to one embodiment of the present invention, the screw can be easily engaged with the engagement hole by screwing the screw into the screw hole.

  In one aspect of the present invention, it is preferable that the shaft member is engaged with the engagement hole in a state where the engagement hole of the pipe member is filled with the sealant.

  According to one aspect of the present invention, the engagement force between the engagement hole and the shaft member can be increased by the sealant.

  One aspect of the present invention is provided with a conduction part that conducts the tip body and the pipe member, the conduction part has a conduction hole formed from the inner peripheral surface of the mounting hole to the outer surface of the tip part body, It is preferable to electrically connect the tip end body and the pipe member by arranging the conducting member through the conducting hole and bringing the conducting member into contact with the pipe member.

  According to the aspect of the present invention, the leading end body and the pipe member can be conducted by disposing the conducting member through the conducting hole of the leading end body and bringing the conducting member into contact with the pipe member. .

  In one aspect of the present invention, an annularly projecting flange portion is formed on the outer peripheral surface of the pipe member, and the conducting member contacts the proximal end side surface of the flange portion, so that the pipe member can be removed from the mounting hole. It is preferable to regulate.

  According to one aspect of the present invention, since the conducting member contacts the proximal end side surface of the flange portion, it is possible to regulate the removal of the pipe member from the mounting hole.

  In one embodiment of the present invention, the proximal end side surface of the flange portion is formed on an inclined surface inclined toward the proximal end side of the pipe member, and the conducting member is pressed against the inclined surface in a direction perpendicular to the central axis of the pipe member. By doing so, it is preferable to urge the pipe member toward the tip side.

  According to one aspect of the present invention, the urging force directed toward the distal end side of the pipe member can be applied to the pipe member by pressing the conducting member against the proximal side surface of the flange portion.

  In one embodiment of the present invention, in the flange portion, the sealing agent filled between the outer peripheral surface on the distal end side than the flange portion of the pipe member and the mounting hole leaks to the proximal end side from the flange portion of the pipe member. It is preferable to regulate this.

  According to one aspect of the present invention, the sealing agent filled between the outer peripheral surface on the tip side of the flange portion of the pipe member and the mounting hole leaks to the base end side of the flange portion of the pipe member. Can be regulated.

  In one embodiment of the present invention, the conduction hole is a screw hole, and the conduction member is preferably a screw screwed into the screw hole.

  According to one embodiment of the present invention, a screw that is a conducting member can be easily disposed through a screw hole that is a conducting hole.

  In order to achieve the object of the present invention, the present invention provides an endoscope provided with the distal end structure of the endoscope insertion portion of the present invention.

  According to the endoscope of the present invention, the pipe member can be easily detached from the distal end portion main body at the time of repair while the pipe member is securely fixed to the distal end main body of the endoscope insertion portion.

  ADVANTAGE OF THE INVENTION According to this invention, a pipe member can be easily removed from a front-end | tip part main body at the time of repair, fixing a pipe member to the front-end | tip part main body of an endoscope insertion part reliably.

Overall configuration diagram of an endoscope to which the bending portion of the embodiment is applied The principal part expansion perspective view of the front-end | tip hard part of the endoscope shown in FIG. Sectional view of the tip hard part along the longitudinal axis of the insertion part The perspective view which looked at the tip hard part from the base end side of the tip hard part Back view of the hard tip from the base end side of the hard tip Side view of the hard tip Perspective view of the forceps pipe as seen from the tip side Side view of forceps pipe Front view of forceps pipe as seen from the tip side Sectional view of the tip structure with a forceps pipe installed in the mounting hole Perspective view of a forceps pipe having a rectangular recess in plan view

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an endoscope insertion portion distal end structure and an endoscope according to the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1 is an overall configuration diagram of an endoscope 10 to which a distal end structure of an endoscope insertion portion according to an embodiment of the present invention is applied.

  The endoscope 10 includes a hand operation unit 12 held by a practitioner, and an insertion unit 14 having a proximal end connected to the hand operation unit 12 and inserted into a body cavity. A proximal end portion of the universal cable 16 is connected to the hand operation portion 12, and a light guide connector 18 is provided at the distal end portion of the universal cable 16. The light guide connector 18 is connected to the light source device 20, whereby illumination light from the light source device 20 is sent to illumination windows 22 and 24 (see FIG. 2) described later. In addition, an electrical connector 26 is connected to the light guide connector 18 via a cable 25, and the electrical connector 26 is connected to the processor unit 28.

  The hand operating unit 12 is provided with an air / water supply button 30 operated by a practitioner, a suction button 32, and a shutter button 34, and a pair of angle knobs 36 and 38 are rotatably provided. . In addition, a forceps insertion portion 40 for inserting a treatment tool such as forceps is provided on the distal end side of the hand operation portion 12.

  The insertion portion 14 has a longitudinal axis A along the insertion direction of the insertion portion 14. Further, the insertion portion 14 is configured by connecting a flexible portion 42, a bending portion 44, and a distal end hard portion 46 from the proximal end portion of the hand operation portion 12 toward the distal end portion. The bending portion 44 is remotely bent by turning the angle knobs 36 and 38 of the hand operation portion 12. Thereby, the distal end hard portion 46 can be directed in a desired direction.

  FIG. 2 is an enlarged perspective view of a main part of the distal end hard portion 46 as viewed from the distal end side. FIG. 3 is a cross-sectional view of the distal end hard portion 46, and is a cross-sectional view along the longitudinal axis A of the insertion portion 14 shown in FIG.

  As shown in FIG. 3, the distal end hard portion 46 includes a distal end portion main body 48 and a cap 50 provided on the distal end side of the insertion portion 14 (see FIG. 1). The tip portion main body 48 is formed in a cylindrical shape by a conductive metal such as stainless steel and has a central axis B along the longitudinal axis A. The cap 50 is made of resin and is detachably provided on the distal end surface 52 of the distal end portion main body 48. The distal end main body 48 is covered with a cylindrical outer tube 54, and the distal end of the outer tube 54 is fixed to the distal end main body 48 by a string-like fixing member 56. The fixing member 56 is bonded to the outer tube 54 with an adhesive 58.

  As shown in FIG. 2, the front end surface 60 of the cap 50 has a through hole 64 in which the observation window 62 is disposed, the illumination windows 22 and 24, the air / water supply nozzle 66, the water jet nozzle 68, and the forceps port. 70 is provided.

  4 is a perspective view of the distal end hard portion 46 as viewed from the proximal end side of the distal end hard portion 46, and FIG. 5 is a rear view of the distal end rigid portion 46 as viewed from the proximal end side of the distal end rigid portion 46. FIG. 6 is a side view of the distal end hard portion 46. FIG. 6 shows a treatment instrument insertion tube 100 and a forceps pipe 102 described later.

  As shown in FIGS. 4 and 5, circular mounting holes 72, 74, 76, 78, 80, and 82 are formed in the distal end main body 48 of the distal rigid portion 46 so as to open to the proximal end surface 48 </ b> A of the distal end main body 48. The These mounting holes 72, 74, 76, 78, 80, 82 are through holes formed from the base end surface 48 </ b> A of the distal end portion main body 48 toward the distal end surface 52 (see FIG. 3) of the distal end portion main body 48.

  4 and 5, the mounting hole 72 is formed above the central axis B and faces the through hole 64 of the cap 50 shown in FIG. A lens barrel 84 is inserted into the mounting hole 72 as shown in FIG. An observation window 62 is fixed to the distal end side inside the lens barrel 84, and an optical system member 85 composed of a plurality of lenses is fixed to the proximal end side of the observation window 62 inside the lens barrel 84. The thus configured lens barrel 84 is inserted into the mounting hole 72 along the central axis B from the proximal end side of the distal end portion main body 48, and the distal end portion of the lens barrel 84 is inserted into the through hole 64 of the cap 50. As a result, the mounting hole 72 is fixed.

  Further, as shown in FIGS. 4 and 5, a recess 86 communicating with the mounting hole 72 is provided on the proximal end side of the mounting hole 72 of the distal end body 48. The recess 86 is formed inward in the radial direction from the outer peripheral surface side of the tip end body 48. As shown in FIG. 3, the concave portion 86 accommodates a prism 88 coupled to the base end portion of the lens barrel 84, an image sensor 90, and a substrate 92. In this embodiment, as an example of a built-in object of the present invention, an imaging optical system including a lens barrel 84, a prism 88, an imaging element 90, and a substrate 92 is illustrated. In addition, as an example of the mounting hole of the present invention to which the imaging optical system is mounted, a mounting hole 73 including a mounting hole 72 and a recess 86 is illustrated.

  The front end of the signal cable 94 is connected to the substrate 92. The base end portion of the signal cable 94 is inserted into the insertion portion 14, the hand operating portion 12, the universal cable 16, and the cable 25 of FIG. 1, extends to the electrical connector 26, and is connected to the processor unit 28. . Therefore, the observation image captured from the observation window 62 in FIG. 3 is formed on the light receiving surface of the image sensor 90 via the optical system member 85 and the prism 88 of the lens barrel 84. The observation image formed on the light receiving surface is converted into an electric signal by the image sensor 90, and then output to the processor unit 28 (see FIG. 1) via the signal cable 94 and converted into a video signal. As a result, the observation image is displayed on the monitor 96 connected to the processor unit 28. As the image sensor 90, a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor can be used.

  4 and 5, the mounting holes 74 and 76 are formed on the left and right sides of the mounting hole 72 above the central axis B. The mounting holes 74 and 76 are arranged so as to face the illumination windows 22 and 24 in FIG. 2, and a pipe member (not shown) provided at the tip of a light guide (not shown) as an insertion member is inserted and attached. Is done. The base end portion of the light guide is inserted through the insertion portion 14, the hand operating portion 12, and the universal cable 16 of FIG. 1 and extends to the light guide connector 18. Therefore, when the light guide connector 18 is connected to the light source device 20, the illumination light from the light source device 20 is transmitted to the illumination windows 22 and 24 in FIG. Is done.

  4 and 5, the mounting hole 78 is formed on the left side of the central axis B and below the mounting hole 74. The mounting hole 78 is disposed opposite to the air / water feeding nozzle 66 of FIG. 2, and a pipe member (not shown) provided at the tip of an air / water feeding tube (not shown) as an insertion member is inserted and attached. Is done. The proximal end portion of the air / water feeding tube is inserted into the insertion portion 14 and the hand operating portion 12 of FIG. 1 and communicated with a valve (not shown) that is opened / closed by an air / water feeding button 30. This valve is connected to an air / water supply connector 98 provided in the light guide connector 18 via a tube (not shown). An air / water supply device (not shown) is connected to the air / water supply connector 98, and air or liquid is supplied from the air / water supply device to the valve via the tube. Therefore, by operating the air / water supply button 30 to open the valve, air or liquid can be ejected from the air / water supply nozzle 66 of FIG. 2 toward the observation window 62.

  4 and 5, the mounting hole 80 is formed on the right side of the central axis B and below the mounting hole 76. The mounting hole 80 is disposed so as to face the water jet nozzle 68 of FIG. 2, and a pipe member (not shown) provided at the distal end portion of a water supply tube (not shown) as an insertion member is inserted and attached. The proximal end portion of the water supply tube is inserted into the insertion portion 14, the hand operating portion 12, and the universal cable 16 of FIG. 1 and is connected to a water supply connector 99 provided in the light guide connector 18. A water supply device (not shown) having a switch is connected to the water supply connector 99. By driving the water supply device with the switch, the liquid is supplied from the water supply device to the water jet nozzle 68 (see FIG. 2) via the water supply tube. Thereby, the liquid can be directly ejected from the water jet nozzle 68 toward the part to be inspected.

  4 and 5, the mounting hole 82 is formed below the central axis B and below the mounting hole 73 including the mounting hole 72 and the recess 86. The mounting hole 82 is disposed to face the forceps port 70 of FIG.

  As shown in FIG. 6, the forceps pipe 102 is inserted and attached to the attachment hole 82. The forceps pipe 102 is provided at the distal end portion of the treatment instrument insertion tube 100 which is an insertion member. In this embodiment, the mounting hole 82 is illustrated as an example of the mounting hole of the present invention, the treatment instrument insertion tube 100 is illustrated as an example of the insertion member of the present invention, and a forceps pipe is illustrated as an example of the pipe member of the present invention. 102 is illustrated. The forceps pipe 102 is made of conductive metal such as stainless steel.

  A proximal end portion of the treatment instrument insertion tube 100 is inserted into the insertion portion 14 of FIG. 1 and communicated with the forceps insertion portion 40 via a forceps channel (not shown) provided in the hand operation portion 12. Has been. Therefore, when a treatment tool such as a forceps or a high-frequency knife is inserted from the forceps insertion portion 40, the treatment tool is led out from the forceps port 70 of FIG. 2 via the treatment tool insertion tube 100 and the forceps pipe 102. The forceps channel is communicated with a suction valve (not shown) that is opened and closed by operating the suction button 32 in FIG. 1, and this suction valve is connected to a suction connector 105 provided in the light guide connector 18 with a tube ( (Not shown). Therefore, by connecting a suction pump (not shown) to the suction connector 105 and operating the suction button 32 to open the suction valve, the treatment tool insertion tube 100 and the forceps channel can remove residues or dirt from the forceps port 70. Can be sucked through.

  Hereinafter, the structure of the distal end portion of the endoscope insertion portion of the present invention will be described by taking as an example the structure for fixing the forceps pipe 102 to the mounting hole 82 of the distal end portion body 48.

  FIG. 7 is a perspective view of the forceps pipe 102 when the forceps pipe 102 is viewed from the distal end side, and FIG. 8 is a side view of the forceps pipe 102. FIG. 9 is a front view of the forceps pipe 102 when the forceps pipe 102 is viewed from the distal end side.

  The forceps pipe 102 has a central axis C, and the distal end portion of the treatment instrument insertion tube 100 (see FIG. 6) is sheathed on a cylindrical portion 102A on the proximal end side of the forceps pipe 102 in the direction of the central axis C. A presser pipe 104 is sheathed at the distal end of the treatment instrument insertion tube 100 sheathed on the cylindrical portion 102A as shown in FIG. Thereby, the connection portion between the treatment instrument insertion tube 100 and the forceps pipe 102 is protected by the presser pipe 104.

  Further, on the outer peripheral surface of the central portion of the forceps pipe 102 in the central axis C direction, a protrusion 106 provided outward in the radial direction of the forceps pipe 102 and a screw receiver having a circular shape in plan view provided inward in the radial direction. A hole 108 is provided. In the present embodiment, the screw receiving hole 108 is illustrated as an example of the engagement hole of the present invention.

  The protrusion 106 has an upper surface 110, left and right side surfaces 112 and 114, and a tip side surface 116, and the outer shape is formed in a rectangular parallelepiped shape.

  The screw receiving hole 108 is provided on the surface of a convex portion 122 formed on the outer peripheral surface of the forceps pipe 102 so as to project like a turret.

  The protruding portion 106 and the screw receiving hole 108 are provided at positions where the positions in the central axis C direction are the same, and are provided at positions where the circumferential positions around the central axis C are different from each other. That is, the protruding portion 106 and the screw receiving hole 108 are formed to be separated on the same circumference of the outer peripheral surface of the forceps pipe 102, but the protruding portion 106 and the screw receiving hole 108 are formed on different circumferences of the outer peripheral surface of the forceps pipe 102. It is also possible to form the screw receiving hole 108.

  As shown in FIGS. 4 and 5, a rectangular positioning groove 124 provided from the proximal end surface 48 </ b> A of the distal end portion body 48 toward the distal end side is provided on the inner peripheral surface of the mounting hole 82. The positioning groove 124 is formed outward in the radial direction of the mounting hole 82 and communicates with a recess 86 adjacent to the mounting hole 82. Further, the positioning groove 124 has a shape corresponding to the outer shape of the protruding portion 106 as described later. By engaging the protruding portion 106 of the forceps pipe 102 with the positioning groove 124, the engaging portion is configured as a rotation restricting portion of the present invention.

  That is, when the protrusion 106 is engaged with the positioning groove 124, as shown in FIGS. 3 and 5, the front end side surface 116 of the protrusion 106 is brought into contact with the front end side edge 125 that defines the positioning groove 124. The left and right side surfaces 112 and 114 of the protruding portion 106 in FIG. 7 are brought into contact with the left and right edge portions 126 and 128 in FIG. That is, the positioning groove 124 has a rectangular shape corresponding to the rectangular outer shape of the protruding portion 106. Thereby, the rotation around the central axis C of the forceps pipe 102 with respect to the mounting hole 82 is reliably restricted. Therefore, by engaging the protrusion 106 with the positioning groove 124, the rotation around the central axis C of the forceps pipe with respect to the mounting hole 82 is restricted.

  In this embodiment, as an example of the positioning groove of the present invention, the positioning groove 124 communicated with the recess 86 is illustrated. Thereby, as shown in FIG. 3, the upper portion including the upper surface 110 of the protruding portion 106 engaged with the positioning groove 124 can be stored in the dead space 87 of the concave portion 86. The dead space 87 is a space excluding the volume of the image pickup apparatus including the prism 88, the image pickup element 90, and the substrate 92 in the entire space of the recess 86. By storing and arranging the upper portion of the protruding portion 106 in such a dead space 87, it is possible to suppress an increase in the diameter of the distal end portion body 48 caused by providing the positioning groove 124 in the distal end portion body 48. The positioning groove of the present invention may be a positioning groove communicating with the other mounting holes 78 and 80 adjacent to the mounting hole 82. The positioning groove of the present invention may be a concave groove provided on the inner peripheral surface of the mounting hole and having a bottom. That is, the positioning groove of the present invention may be a concave groove having a bottom portion that does not communicate with other holes.

  As shown in FIGS. 4 and 5, the mounting hole 82 is provided with a screw hole 130 formed from the inner peripheral surface of the mounting hole 82 to the outer surface 48 </ b> B of the tip end body 48. As shown in FIG. 6, a screw 132 engaged with the screw receiving hole 108 of the forceps pipe 102 is screwed into the screw hole 130 so as to penetrate therethrough.

  Here, FIG. 10 is a cross-sectional view of the distal end structure showing a state where the forceps pipe 102 is mounted in the mounting hole 82.

  As shown in FIG. 10, when the screw 132 is screwed into the screw hole 130, the tip of the screw 132 protrudes from the screw hole 130 and engages with the screw receiving hole 108 of the forceps pipe 102. By engaging the screw 132 with the screw receiving hole 108, the engaging portion is configured as the axial direction restricting portion of the present invention.

  When the screw 132 is engaged with the screw receiving hole 108, the movement of the forceps pipe 102 in the direction of the central axis C with respect to the mounting hole 82 is reliably restricted. Therefore, by engaging the screw 132 with the screw receiving hole 108, the position of the forceps pipe in the central axis C direction with respect to the mounting hole 82 is regulated. The screw 132 is made of a conductive metal such as stainless steel in order to connect the forceps pipe 102 and the tip body 48.

  In this embodiment, the screw hole 130 is illustrated as an example of the through hole of the present invention, and the screw 132 screwed into the screw hole 130 is illustrated as an example of the shaft member of the present invention. Thereby, the screw 132 that is the shaft member can be disposed through the screw hole 130 that is the through hole without dropping. Further, the screw 132 can be easily engaged with the screw receiving hole 108 by screwing the screw 132 into the screw hole 130.

  The through hole of the present invention is configured as a through hole, the shaft member of the present invention is configured by a cylindrical member such as a pin, the cylindrical member is disposed through the through hole, and the cylindrical member is engaged with the screw receiving hole 108. You may let them.

  On the other hand, a concave groove 134 is formed in the mounting hole 82 around the screw hole 130 on the inner peripheral surface of the mounting hole 82. The concave groove 134 is a groove that accommodates the convex portion 122 of the forceps pipe 102, and is formed outward in the radial direction of the mounting hole 82. When the protruding portion 106 is engaged with the positioning groove 124, the convex portion 122 is accommodated in the concave groove 134. That is, when the protrusion 106 is engaged with the positioning groove 124, the screw hole 130 and the screw receiving hole 108 are positioned. Thereby, the screw 132 can be reliably engaged with the screw receiving hole 108.

  Next, a procedure for fixing the forceps pipe 102 to the mounting hole 82 will be described.

  As shown in FIG. 6, first, in the insertion direction of the forceps pipe 102 with respect to the mounting hole 82 (the direction of the central axis C of the forceps pipe 102), the protruding portion 106 of the forceps pipe 102 is aligned with the positioning groove 124 of the mounting hole 82. The screw receiving hole 108 of the forceps pipe 102 is aligned with the screw hole 130 of 82, and the forceps pipe 102 is inserted into the mounting hole 82 along the central axis C of the forceps pipe 102. Thereby, since the protrusion part 106 engages with the positioning groove | channel 124, rotation around the central axis C of the forceps pipe 102 with respect to the mounting hole 82 is controlled. At this time, the convex portion 122 of the forceps pipe 102 is accommodated in the concave groove 134 of the mounting hole 82, and the screw hole 130 and the screw receiving hole 108 are positioned.

  Next, the screw 132 screwed into the screw hole 130 is screwed toward the forceps pipe 102 to engage the screw 132 with the screw receiving hole 108. Thereby, the position of the forceps pipe 102 in the central axis C direction with respect to the mounting hole 82 is regulated.

  According to the distal end structure of the endoscope insertion portion of the present embodiment, the center of the forceps pipe 102 with respect to the mounting hole 82 is obtained by engaging the protrusion 106 with the positioning groove 124 having a shape corresponding to the outer shape of the protrusion 106. Rotation around axis C was restricted. Thereby, even if a force in the rotational direction acts on the forceps pipe 102, it is possible to reliably prevent the forceps pipe 102 from being displaced in the rotational direction with respect to the mounting hole 82.

  Further, according to the distal end structure of the endoscope insertion portion of the present embodiment, the screw 132 is engaged with the screw receiving hole 108 of the forceps pipe 102, and the position of the forceps pipe 102 in the direction of the central axis C with respect to the mounting hole 82. Regulated. Thereby, even if a force in the removal direction acts on the forceps pipe 102, the forceps pipe 102 can be reliably prevented from being displaced in the removal direction with respect to the mounting hole 82.

  Therefore, according to the distal end portion structure of the endoscope insertion portion of the present embodiment, the forceps pipe 102 can be reliably fixed to the distal end portion main body 48. In this case, since it is only necessary to engage the screw 132 with the screw receiving hole 108, the position of the forceps pipe 102 in the direction of the central axis C with respect to the mounting hole 82 can be regulated without applying a large axial force to the screw 132. . Therefore, deformation or damage of the forceps pipe 102 caused by applying a large axial force from the screw 132 to the forceps pipe 102 can be prevented.

  When repairing the tip body 48, the forceps pipe 102 can be pulled out from the mounting hole 82 along the central axis C by simply loosening the screw 132 and retracting the screw 132 from the screw receiving hole 108.

  Therefore, according to the distal end structure of the endoscope insertion portion of the present embodiment, the forceps pipe 102 can be easily detached from the distal end portion body 48 at the time of repair.

  As described above, according to the distal end structure of the endoscope insertion portion of the present embodiment, the forceps pipe 102 is securely fixed to the distal end portion main body 48, and at the time of repair, the forceps pipe 102 is easily detached from the distal end portion main body 48. be able to.

  By the way, it is preferable to engage the screw 132 with the screw receiving hole 108 in a state in which the screw receiving hole 108 is filled with the loosening prevention sealant in order to increase the engaging force between the screw receiving hole 108 and the screw 132.

  On the other hand, since the loosening prevention sealant is generally an insulator, when the screw receiving hole 108 is filled with the loosening prevention sealant, the forceps pipe 102 and the tip body 48 are electrically connected via the screw 132. It becomes difficult to make. In the field of endoscopes, a design that improves EMC (Electro-Magnetic-Compatibility) characteristics and the like is generally performed by ensuring conductivity between the pipe member of the insertion member and the tip body. ing. Therefore, when the screw receiving hole 108 is filled with a sealing agent for preventing the loosening of the insulator, the conductivity between the forceps pipe 102 and the tip body 48 is separated from the screw 132 engaged with the screw receiving hole 108. It is necessary to separately provide a conduction portion for ensuring the above.

  In this embodiment, as the conducting member of the present invention constituting the conducting part, a screw 140 made of metal such as stainless steel is illustrated as shown in FIG. 6, and the screw 140 is screwed as a conducting hole constituting the conducting part. The screw hole 142 is illustrated. Thereby, the screw 140 which is a conduction member can be easily penetrated and disposed in the screw hole 142 which is a conduction hole. A conductive member such as a pin may be applied instead of the screw 140, and a through hole may be applied instead of the screw hole 142.

  Below, the structure of the conduction | electrical_connection part which consists of the screw | thread 140 and the screw hole 142 is demonstrated.

  As shown in FIGS. 4 and 6, the screw hole 142 is formed from the inner peripheral surface of the mounting hole 82 to the outer surface 48 </ b> B of the tip end body 48. Further, the screw hole 142 is formed on the distal end side of the distal end body 48 with respect to the screw hole 130. Further, the screw hole 142 is formed in a direction orthogonal to the central axis C of the forceps pipe 102 attached to the attachment hole 82.

  On the other hand, an annularly projecting flange portion 103 is formed on the outer peripheral surface of the cylindrical portion 102B on the distal end side of the forceps pipe 102. The flange portion 103 is formed to protrude outward in the radial direction of the forceps pipe 102 along the circumferential direction perpendicular to the central axis C on the outer peripheral surface of the cylindrical portion 102B. When the forceps pipe 102 is inserted into the mounting hole 82, the outer peripheral surface of the flange portion 103 contacts the inner peripheral surface of the mounting hole 82.

  Further, when the screw 140 penetrating the screw hole 142 is screwed into the mounting hole 82, the screw 140 comes into contact with the proximal end side surface 103 </ b> A of the flange portion 103. As a result, the forceps pipe 102 and the tip body 48 are electrically connected via the screw 140, and the movement of the forceps pipe 102 in the removal direction with respect to the mounting hole 82 is restricted by the screw 140.

  By the way, when the forceps pipe 102 is fixed to the mounting hole 82, in order to ensure airtightness between the forceps pipe 102 and the mounting hole 82, the cylindrical portion 102 </ b> B on the distal end side of the flange portion 103 of the forceps pipe 102. It is preferable to fill an airtight sealant between the outer peripheral surface and the mounting hole 82. The hermetic sealant is filled by inserting the forceps pipe 102 into the mounting hole 82 in a state where it is applied to the outer peripheral surface of the cylindrical portion 102 </ b> B on the tip side of the flange portion 103. The airtight sealant is also generally an insulator.

  Here, the forceps pipe 102 is provided with a structure in which the airtight sealant does not adhere to the screw 140 at the conduction portion that secures the conduction between the forceps pipe 102 and the tip body 48 by passing the screw 140 through the screw hole 142. There is a need. For this reason, the aforementioned flange portion 103 is provided on the outer peripheral surface of the forceps pipe 102. That is, since the outer peripheral surface of the flange portion 103 is in contact with the inner peripheral surface of the mounting hole 82, the flange portion 103 functions as a weir and prevents the airtight sealant from leaking from the flange portion 103 to the proximal end side. be able to. Therefore, it is possible to prevent the airtight sealant from adhering to the screw 140.

  Further, it is necessary to prevent the loosening-preventing sealing agent filled in the screw receiving hole 108 from leaking out from the screw receiving hole 108 and adhering to the screw 140. Therefore, the screw receiving hole 108 as an example of the engagement hole of the present invention is configured as a concave portion having a circular shape in plan view as shown in FIG. Thereby, it is possible to suppress leakage of the loosening prevention sealing agent from the screw receiving hole 108. Note that the shape of the engagement hole of the present invention is not limited to a circular recess in plan view.

  FIG. 11 is a perspective view of a forceps pipe 102 having a recess 144 having a rectangular shape in plan view, which is another example of the engagement hole of the present invention. Even in the case of the concave portion 144 having a rectangular shape in plan view, it is possible to prevent the loosening prevention sealing agent filled in the concave portion 144 from leaking out of the concave portion 144. In this case, a sealing agent for preventing loosening leaks from the recess 144 toward the screw 140 by forming the inner wall 144A on the front end side among the four inner walls defining the recess 144 higher than the other walls. This can be further suppressed.

  On the other hand, the forceps pipe 102 shown in FIG. 7 has an annular tip surface 102C. As shown in FIG. 3, the distal end surface 102 </ b> C is abutted against an annular abutting surface 146 formed at the distal end of the mounting hole 82, and the forceps pipe 102 is fixed to the mounting hole 82 in this state. Here, when a gap is generated between the abutment surface 146 of the mounting hole 82 and the distal end surface 102C of the forceps pipe 102, dirt enters from the gap, and the gap between the mounting hole 82 and the forceps pipe 102 becomes dirty. Cause accumulation.

  In order to solve such a problem, it is necessary to fix the forceps pipe 102 to the mounting hole 82 in a state where the distal end surface 102C of the forceps pipe 102 is firmly abutted against the abutting surface 148 of the mounting hole 82. .

  Therefore, the distal end structure of the endoscope insertion portion according to the embodiment has an inclined surface in which the proximal end side surface 103A of the flange portion 103 is inclined from the outer periphery of the flange portion 103 to the proximal end side as shown in the enlarged view of the main part in FIG. It is configured as. Further, as described above, the screw hole 142 is formed in a direction orthogonal to the central axis C of the forceps pipe 102 attached to the attachment hole 82. Therefore, the screw 140 screwed into the screw hole 142 is pressed against the base end side surface 103 </ b> A from the direction of the arrow D perpendicular to the central axis C of the forceps pipe 102. As a result, the forceps pipe 102 is urged toward the distal end side indicated by the arrow E of the forceps pipe 102 and is fixed to the mounting hole 82 in a state where the distal end surface 102C of the forceps pipe 102 is firmly abutted against the abutting surface 146. The Therefore, with such a configuration, there is no gap between the abutment surface 146 of the mounting hole 82 and the distal end face 102C of the forceps pipe 102, and therefore it is possible to prevent dirt from entering through the gap.

  Further, as shown in FIG. 10, an annular abutting surface 148 that abuts the front end side surface 103 </ b> B of the flange portion 103 may be formed on the inner peripheral surface of the mounting hole 82. As described above, the screw 140 is pressed against the proximal side surface 103A and the forceps pipe 102 is urged toward the distal end side of the forceps pipe 102, whereby the distal side surface 103B of the flange portion 103 is firmly abutted against the abutting surface 148. be able to. Thereby, it can prevent reliably that the sealing compound for airtightness leaks from the flange part 103 to the base end side.

  In the distal end structure of the endoscope insertion portion of the embodiment, even if the screw 132 is loosened and the restriction of the position of the forceps pipe 102 in the central axis C direction by the screw 132 is released, the distal end portion of the screw 140 is Since it is in contact with the base end side surface 103A of the flange portion 103, the forceps pipe 102 can be prevented from falling off.

  In the present embodiment described above, the structure for fixing the forceps pipe 102 to the mounting hole 82 of the distal end portion main body 48 is described as an example of the distal end portion structure of the endoscope insertion portion of the present invention. It is not a thing. For example, the structure of fixing the pipe member of the light guide to the mounting holes 74, 76, the structure of fixing the pipe member of the air / water feeding tube to the mounting hole 78, or the structure of fixing the pipe member of the water feeding tube to the mounting hole 80 of the present invention. You may apply the front-end | tip part structure of an endoscope insertion part.

DESCRIPTION OF SYMBOLS 10 Endoscope 12 Hand operation part 14 Insertion part 16 Universal cable 18 Light guide connector 20 Light source device 22 Illumination window 24 Illumination window 25 Cable 26 Electrical connector 28 Processor unit 30 Air supply / water supply button 32 Suction button 34 Shutter button 36 Angle knob 38 Angle knob 40 Forceps insertion portion 42 Flexible portion 44 Bending portion 46 Tip rigid portion 48 Tip portion main body 48A Base end surface 48B Outer surface 50 Cap 52 Tip surface 54 Skin tube 56 Fixing member 58 Adhesive 60 Tip surface 62 Observation window 64 Through hole 66 Feeding Air supply nozzle 68 Water jet nozzle 70 Forceps port 72 Mounting hole 73 Mounting hole 74 Mounting hole 76 Mounting hole 78 Mounting hole 80 Mounting hole 82 Mounting hole 84 Lens tube 85 Optical system member 86 Recess 86A Wall 86B Step 87 Dead space 88 Prism 90 imaging Element 92 Substrate 94 Signal cable 96 Monitor 98 Air / water supply connector 99 Water supply connector 100 Treatment instrument insertion tube 102 Forceps pipe 102A Cylindrical portion 102B Cylindrical portion 102C Tip surface 103 Flange portion 103A Base end side surface 103B Tip side surface 104 Presser pipe 105 Suction connector 106 Protruding portion 108 Screw receiving hole 110 Upper surface 112 Side surface 114 Side surface 116 Tip side surface 122 Convex portion 124 Positioning groove 126 Edge portion 128 Edge portion 130 Screw hole 132 Screw 134 Recessed groove 140 Screw 142 Screw hole 144 Recessed portion 144A Inner wall surface 146 Surface 148 Abutting surface

Claims (12)

A distal end body provided on the distal end side of the endoscope insertion portion;
A pipe member provided on the distal end side of the insertion member inserted into the endoscope insertion portion;
An opening formed in the proximal end surface of the distal end portion main body, in which the pipe member is mounted; and
A rotation restricting portion for restricting rotation around the central axis of the pipe member with respect to the mounting hole;
An axial direction restricting portion for restricting the position of the pipe member in the central axial direction relative to the mounting hole;
With
The rotation restricting portion has a protrusion provided on the outer peripheral surface of the pipe member, and a positioning groove provided on the inner peripheral surface of the mounting hole and having a shape corresponding to the outer shape of the protrusion, By engaging the protrusion and the positioning groove, the rotation around the central axis of the pipe member relative to the mounting hole is restricted,
The axial direction restricting portion includes an engagement hole provided in an outer peripheral surface of the pipe member, and a through hole formed from an inner peripheral surface of the mounting hole to an outer surface of the tip end body, and the through hole The shaft member is disposed through the shaft member, and the shaft member is engaged with the engagement hole, thereby restricting the position of the pipe member in the central axis direction with respect to the mounting hole.
End tip structure of the endoscope insertion part. The pipe member is provided on a distal end side of the insertion member through which a treatment tool is inserted into the insertion member.
The distal end structure of the endoscope insertion portion according to claim 1. The tip body has a built-in attachment hole attached to the tip body,
The positioning groove communicates with the mounting hole.
The distal end structure of the endoscope insertion portion according to claim 1 or 2. The mounting hole is a mounting hole for mounting an imaging optical system.
The distal end structure of the endoscope insertion portion according to claim 3. The through hole is a screw hole, and the shaft member is a screw screwed into the screw hole.
The distal end structure of the endoscope insertion portion according to any one of claims 1 to 4. The shaft member is engaged with the engagement hole in a state where the engagement hole of the pipe member is filled with a sealant.
The distal end structure of the endoscope insertion portion according to any one of claims 1 to 5. A conduction part for conducting the tip body and the pipe member;
The conduction part has a conduction hole formed from an inner peripheral surface of the mounting hole to an outer surface of the tip body, and a conduction member is disposed through the conduction hole so that the conduction member is the pipe member. To bring the tip body and the pipe member into conduction,
The distal end structure of the endoscope insertion portion according to claim 6. On the outer peripheral surface of the pipe member, a flange portion protruding in an annular shape is formed,
The conducting member regulates the disconnection of the pipe member with respect to the mounting hole by contacting a proximal end side surface of the flange portion.
The distal end structure of the endoscope insertion portion according to claim 7. The base end side surface of the flange portion is formed on an inclined surface inclined to the base end side of the pipe member,
The conducting member urges the pipe member toward the tip side by being pressed against the inclined surface in a direction orthogonal to the central axis of the pipe member.
The distal end structure of the endoscope insertion portion according to claim 8. In the flange portion, the sealing agent filled between the outer peripheral surface on the distal end side of the flange portion of the pipe member and the mounting hole leaks to the proximal end side of the flange portion of the pipe member. To regulate the
The tip part structure of the endoscope insertion part according to claim 8 or 9. The conduction hole is a screw hole, and the conduction member is a screw screwed into the screw hole.
The distal end structure of the endoscope insertion portion according to any one of claims 7 to 10.   An endoscope comprising the distal end structure of the endoscope insertion portion according to any one of claims 1 to 11.

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