JP6210956B2 - Fixing structure of tubular member and endoscope vent - Google Patents

Description

  The present invention relates to a fixing structure of a tubular member that is inserted and fixed in a through hole provided in a partition wall that blocks the outside and an internal space, and an endoscope vent base having the fixing structure.

An endoscope mainly includes an insertion portion that is inserted into a body such as the stomach and the large intestine, an operation portion that is provided on the proximal end side of the insertion portion, and a universal cord that extends from a side portion of the operation portion. It is configured. An endoscope connector is provided at the base end of the universal cord.
In an endoscope, an operation part or an endoscope connector provided with a vent hole for supplying air into the endoscope such as an insertion part and an operation part at the time of water leakage inspection. is there.

  The vent is normally closed. At the time of the water leakage inspection, a pipe connection port extending from a water leakage inspection device that supplies gas is connected to the vent hole. The vent cap is opened from the closed state when the pipe connection port is connected. As a result, a watertight test can be performed by being pressurized by air supply. After completion of the watertight test, the pipe connection port is removed from the vent metal and becomes closed again.

  In addition, an external cap for opening the inside of the endoscope to the atmosphere is detachable from the vent hole. When the endoscope is sterilized, or when the endoscope is transported by aircraft, when the endoscope is left under negative pressure, the curved rubber that forms the outer periphery of the bending portion is expanded. To prevent it from bursting.

  Japanese Patent Application Laid-Open No. 2004-151561 discloses a vent hole provided in an endoscope connector. In this endoscope, the vent hole base is provided so as to protrude from the outer peripheral surface of the connector portion as a vent valve that communicates the internal through hole of the connector portion with the outside.

  Specifically, the vent cap is inserted through the small diameter part of the communication pipe provided with a male screw into the mounting hole provided in the thick outer wall of the connector part, and the fixing member is changed from the inner side of the connector to the small diameter part. After being screwed together, it is fixed by bonding.

In this way, it is possible to secure a strong fixing strength by inserting the thin diameter portion of the communication pipe into the attachment hole of the thick outer wall body of the connector portion and securing the fitting length after sufficient fixing. it can.

  On the other hand, there is a structure shown in FIG. In this vent cap 1, the small diameter portion 3 t of the cap body (corresponding to the vent cap of Patent Document 1) 3 is disposed in the mounting hole 2 h of the wall portion 2 w where the fitting length of the case body 2 is not sufficient. Then, the first nut 4 and the second nut 5 are screwed into the male screw 3m formed in the small diameter portion 3t, and the wall portion 2w is sandwiched and fixed from both.

  Reference numeral 7 in FIG. 1 is a rotation stopper. The rotation stopper 7 includes a rotation prevention surface 5f formed by cutting a part of the outer peripheral surface of the second nut 5, a contact plane 2f provided at a predetermined position near the attachment hole of the wall 2w, It consists of

Adhesive is applied to the female screw, and the second nut 5 is disposed on the inner surface side of the wall 2w. At this time, the rotation preventing surface 5f is disposed in contact with the contact flat surface 2f.
As a result, when the small-diameter portion 3t provided with the male screw 3m is rotated about the axis and the male screw 3m is screwed into the female screw of the second nut 5, the second nut 5 rotates in a rotating manner. This prevents the male screw 3m of the small diameter portion 3t from being smoothly engaged with the female screw of the second nut 5.
Reference numeral 8a is a shaft body, reference numeral 8b is a valve body, reference numeral 8c is a sliding member, reference numeral 8d is a rotating ring, and reference numeral 9 is a coil spring.

No. 2000-102508

  However, as described above, the external cap is attached to and detached from the vent hole base. When the cap is attached and when the cap is removed, torque acts on the vent hole from the rotated external cap.

  When attaching / detaching the external cap to / from the vent cap of Patent Document 1, the communication cap is secured with a sufficient fitting length and secured with a strong fixing strength. Is never rotated.

  On the other hand, in the vent 1 shown in FIG. 1, the wall portion 2 w of the case body 2 is thinner than the thickness of the outer wall body of Patent Document 1. For this reason, an adhesive fixing portion that integrally fixes the small diameter portion 3t having the male screw 3m and the first nut 4, or an adhesive that integrally fixes the thin diameter portion 3t and the second nut 5. If the fixing portion is destroyed by repeated attachment / detachment of the external cap, the base body 3 may be rotated by torque when the external cap is attached / detached. Then, when the base body 3 is rotated by the torque at the time of attaching / detaching the external cap, the watertightness between the base body 3 and the wall portion 2w of the case body 2 is impaired, and repair is required.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tubular member fixing structure that reliably prevents the base body from rotating due to torque when the external cap is attached and detached.

  The fixing structure of the tubular member of one aspect of the present invention includes a partition wall that blocks an internal space and the outside, a through hole that is provided in the partition wall and communicates the internal space and the outside, and A first exposed portion that is exposed to the outside, is formed with a first exposed portion; and a second exposed portion that is connected to the first exposed portion and is exposed to the inner space side from the through hole. A communication member provided with at least one flat surface on an outer peripheral surface portion of the first exposed portion, and a first male screw of the first exposed portion of the communication member, which is screwed into the first external screw and disposed on the outer side. A fastening member which can be moved forward and backward to the exposed portion, a bottom surface having a predetermined depth from the outer surface of the partition wall, a positioning hole having at least one positioning surface around the through hole, and a positioning hole disposed in the positioning hole. Formed in a predetermined thickness and placed in the positioning hole. An anti-rotation member having an outer fitting surface disposed in contact with the positioning surface and at least one inner fitting surface disposed in contact with a plane of the first exposed portion, and on the inner space side, A retaining member that is attached to the second exposed portion and restricts the communication member from slipping out of the through hole.

  According to the present invention, it is possible to realize a tubular member fixing structure that reliably prevents the base body from rotating due to torque when the external cap is attached / detached.

The figure explaining the example of composition of the vent cap provided in the operation part The figure explaining the endoscope which equips an operation part with a leak detection base The figure explaining the relationship between the base body of a leak detection base, and the case body of an operation part The figure explaining the base body of the vent base FIG. 5 is a cross-sectional view taken along line Y5-Y5 of FIG. 4 and illustrates a relationship between a rotation regulating surface formed on the externally exposed portion and an inner fitting surface of the rotation stopper member. The figure explaining the through-hole and positioning hole which are provided in the case body of an operation part The figure explaining the structure of a rotation stop member The figure explaining the assembly | attachment in the positioning hole of a rotation stop member The figure explaining the assembly which clamps and fixes a base body to a case body with two nuts FIG. 8B is a cross-sectional view taken along line Y8C-Y8C in FIG. 8B, illustrating a rotation stopper member housed in the positioning hole The figure explaining other structure of a rotation stopping member, and the positioning surface provided in the rotation control surface provided in the external exposure part corresponding to the rotation stopping member of another structure, and a positioning hole

Embodiments of the present invention will be described below with reference to the drawings.
In addition, each drawing used for the following description is shown schematically, and in order to show each component to the extent that it can be recognized on the drawing, the dimensional relationship and scale of each member are for each component. The scale is different, and the present invention is limited to the quantity of components, the shape of the components, the ratio of the sizes of the components, and the relative positional relationship of the components described in these drawings. It is not limited to.

An endoscope 10 shown in FIG. 2 is, for example, a nasopharyngeal mirror or a nephroscope, and is mainly configured by providing an insertion part 11, an operation part 12, and an eyepiece part 13. The eyepiece 13 is provided on the proximal end side of the operation unit 12.
Reference numeral 14 denotes a light guide, and the connection connector 14 c of the light guide 14 is detachable from a light guide connection port (not shown) provided on the side of the operation unit 12.

  The insertion portion 11 includes, in order from the distal end side, a rigid distal end portion 15, a bending portion 16 configured to bend in the vertical direction, and a flexible tube portion 17 that is a flexible tube body. It is configured.

  On the proximal end side of the flexible tube portion 17, a bend preventing portion 18 having a predetermined elastic force is provided. The bend preventing portion 18 is provided so as to cover the proximal end portion of the flexible tube portion 17 to prevent buckling of the flexible tube portion 17, and the flexible tube portion 17 and the distal end side of the operation portion 12. It is fixed to keep the water tight.

  The operation unit 12 is provided with a bending operation lever 19, a treatment instrument insertion port 20, a water leakage detection cap 30 that is a vent cap, and the like. The bending operation lever 19 is rotatable, and the bending portion 16 is bent in two directions, up and down, as a bending wire (not shown) is pulled and loosened as the lever 19 is rotated.

  Note that the endoscope 10 is not limited to a nasopharyngeal mirror or a renal ureteroscope, and may be any endoscope such as a portable endoscope provided with the water leak detection base 30 in the operation unit 12. .

As shown in FIG. 3, a base arrangement portion 23 that protrudes outward from the outer surface is provided on the distal end side of the case body 22 having a partition wall that constitutes the operation portion 12 of the endoscope 10. The water leakage detection base 30 is provided so as to protrude from the base arrangement part 23 of the case body 22 that shuts off the internal space and the outside.
Reference numeral 22h denotes a through-hole, which communicates the internal space of the operation unit 12 with the outside, and is disposed through a small-diameter portion 31b (described later) of the water leakage detection base 30. Reference numeral 23h denotes a positioning hole, which will be described later.

  The water leakage detection base 30 includes a base body 31 that is a tubular member attached to the base placement portion 23, a known rotating ring 32 provided in the base body 31, a sliding member 33, a valve body 34, a shaft body 35, a valve It mainly comprises a member 36, a holding member 37, and a coil spring 38.

  As shown in FIGS. 3 and 4, the base body 31 of the present embodiment is a stepped pipe having a large diameter portion 31 a and a small diameter portion 31 b and is a communication member. The base body 31 is provided with a stepped through hole 31h that communicates the inside and outside of the endoscope along the central axis.

The large-diameter portion 31a is configured as an air cap mounting portion to which an air cap is mounted. A cam pin 39 protrudes from the outer peripheral surface of the large diameter portion 31a.
The cam pin 39 is engaged with a cam groove of an air cap (not shown).

  The small-diameter portion 31b of the base body 31 is a fixed portion, and has an external exposed portion 31c and an in-space exposed portion 31d. The external exposed portion 31c is a first exposed portion, is provided on the large diameter portion 31a side, and is disposed on a part of the through hole 22h and outside without passing through the through hole 22h.

  In contrast, the in-space exposed portion 31d is a second exposed portion and is provided on the distal end side of the external exposed portion 31c, and is disposed in the internal space 12S of the operation portion 12 through the through hole 22h. .

  The external exposed portion 31c is formed with a first male screw 31cm, and the in-space exposed portion 31d is formed with a second male screw 31dm. In the present embodiment, the outer diameter of the external exposed portion 31c and the external diameter of the in-space exposed portion 31d are different from the external diameter of the externally exposed portion 31d.

  In the externally exposed portion 31c having the first male screw 31cm, a first nut 41, which is a fastening member having a female screw that is screwed into the first male screw 31cm, is disposed so as to be movable forward and backward in the axial direction.

On the other hand, in the space exposed portion 31d having the second male screw 31dm, a second nut 42, which is a retaining member having a female screw that is screwed into the second male screw 31dm, is disposed so as to be movable forward and backward in the axial direction. Is done.
Reference numeral 42f is a detent surface. The anti-rotation surface 42f is formed by cutting a part of the outer peripheral surface of the second nut 42. The anti-rotation surface 42f is disposed on the contact plane 23t. Moreover, the code | symbol 31e is an O-ring arrangement | positioning groove | channel, and is arrange | positioned in the through-hole 22h. An O-ring indicated by reference numeral 61 in FIG. 3 is provided in the O-ring arrangement groove 31e. The O-ring 61 maintains watertightness between the small diameter portion 31b and the through hole 22h.

  Reference numeral 31f is a rotation restricting surface. As shown in FIG. 5, the rotation restricting surface 31f is a cut-out plane provided by cutting away the side portion of the externally exposed portion 31c. An inner fitting surface 51 of the rotation stop member 50 indicated by a broken line is disposed in contact with the rotation restricting surface 31f. Reference numeral 52 denotes an outer fitting surface.

  As shown in FIGS. 3 and 6, the base mounting portion 23 is provided with an external plane 23 o and a plane in space 23 i which are the surfaces. A first nut 41 is disposed in contact with the outer plane 23o, and a second nut 42 is disposed in contact with the in-space plane 23i.

  A positioning hole 23h is provided in the external plane 23o. The positioning hole 23h is a hole in which the anti-rotation member 50 shown by the broken line is accommodated and has a bottom surface 23d having a predetermined depth from the external plane 23o. The positioning hole 23h is provided with a positioning surface 23f on which the outer fitting surface 52 of the rotation stop member 50 is disposed.

  The anti-rotation member 50 is a flat plate member having a predetermined plate thickness having a pair of parallel inner fitting surfaces 51 and an outer fitting surface 52 parallel to each inner fitting surface 51 as shown in FIG. It is a concave shape. The rotation stop member 50 is disposed in the positioning hole 23h, the inner fitting surface 51 abuts against the rotation regulating surface 31f formed on the external exposed portion 31c disposed in the through hole 22h, and the outer fitting surface 52 is It abuts on a positioning surface 23f indicated by a two-dot chain line.

When the base body 31 is assembled to the case body 22, the small-diameter portion 31b with the first nut 41 disposed at a predetermined position of the externally exposed portion 31c is contacted with the anti-rotation surface 42f via the through hole 22h. Leading to the vicinity of the second nut 42 arranged on the tangential plane 23t, the male screw 31dm of the exposed portion 31d in the space is screwed to the female screw of the second nut 42, and the rotation restricting surface 31f is in contact with the positioning surface 23f. Position and fix so as to face each other.

  As shown in FIG. 8A, the operator accommodates and arranges the rotation stop member 50 in the positioning hole 23h as indicated by a two-dot chain line arrow Y8A through a gap C between the first nut 41 and the outer flat surface 23o.

  Thereafter, the operator tightens the first nut 41 so as to move toward the base arrangement portion 23 as indicated by an arrow Y8B in FIG. 8B. As a result, the base body 31 is clamped and fixed to the base placement portion 23 by the two nuts 41 and 42, and the assembly of the base body 31 to the case body 22 is completed.

  In a state in which the base body 31 is assembled and fixed to the case body 22, the rotation stopper member 50 is accommodated and disposed in the positioning hole 23h. Contacts the positioning surface 23f, and the inner fitting surface 51 contacts the rotation restricting surface 31f.

  In a state in which the rotation stopper member 50 is accommodated in the positioning hole 23h, the rotation stopper member 50 rotates in the positioning hole 23h because the outer fitting surface 52 of the rotation stopper member 50 is in contact with the positioning surface 23f. That is definitely regulated. In addition, in a state where the rotation stopper member 50 is accommodated in the positioning hole 23h, the small diameter portion 31b is prevented from rotating by causing the inner fitting surface 51 of the rotation stopper member 50 to contact the rotation regulating surface 31f. Rotation in the positioning hole 23h integrally with the member 50 is reliably restricted.

  Therefore, for example, when an external cap is attached to the water leakage detection base 30, when an external cap (not shown) is removed from the water leakage detection base 30, the water leakage is caused by the torque acting on the water leakage detection base 30 from the rotated external cap. The problem that the base body 31 of the detection base 30 is rotated is solved. As a result, the occurrence of problems that impair the watertightness between the base body 31 and the case body 22 is greatly reduced.

  Further, by adding a procedure for accommodating and disposing the rotation stopper member 50 in the positioning hole 23h, in other words, the problem that the base body 31 is rotated without significantly changing the assembling procedure as compared with the conventional one is eliminated. be able to.

  In addition, the thickness dimension of the rotation stop member 50 is set smaller than the gap C. Further, the depth dimension of the positioning hole 23 h is equal to or larger than the thickness dimension of the rotation stopper member 50. That is, the rotation stop member 50 does not protrude from the external plane 23o in the state of being disposed in the positioning hole 23h.

  In the above-described embodiment, the rotation stopper member 50 has a pair of inner fitting surfaces 51 facing each other and an outer fitting surface 52 provided in parallel to the inner fitting surfaces 51. However, the rotation stop member 50 is not limited to the concave shape, but is U-shaped or a pair of inner fitting surfaces 51A intersect at an acute angle θ as shown in FIG. The fitting surface 52A may be a V-shaped rotation stop member 50A provided in parallel with the inner fitting surface 51A.

  In this configuration, the two rotation restricting surfaces 31fA on which the inner fitting surfaces 51A are disposed in contact with the external exposed portion 31c are formed so as to intersect at an acute angle θ. Then, the two positioning surfaces 23fB in which the outer fitting surface 52A is disposed in contact with the positioning hole 23hA are formed so as to intersect at an acute angle θ.

  According to this configuration, the problem that the base body 31 of the water leakage detection base 30 is rotated by the torque acting on the water leakage detection base 30 from the external cap that is rotated as described above is eliminated.

  Also, as shown in FIG. 9B, a rectangular rotation stop member 50B may be used. In the rotation stopping member 50B, the two long sides are the inner fitting surface 51B and the outer fitting surface 52B, respectively.

  In this configuration, one rotation restricting surface 31fB is formed in which the inner fitting surface 51B is disposed in contact with the external exposed portion 31c. Then, one positioning surface 23fB in which the outer fitting surface 52B is disposed in contact with the positioning hole 23h is provided at a predetermined position.

  In addition, as shown in FIG. 9C, the positioning hole 23h is formed by using the rotation stopper member 50C in which the length of the outer fitting surface 52B is set shorter than the length of the inner fitting surface 51B. Therefore, it is possible to prevent the operation unit 12 from becoming large.

  According to these configurations, the problem that the base body 31 of the water leakage detection base 30 is rotated by the torque acting on the water leakage detection base 30 from the external cap that is rotated in the same manner as described above is eliminated.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 ... Vent base 2 ... Case body 2f ... Contact plane 2h ... Mounting hole 2w ... Wall part
DESCRIPTION OF SYMBOLS 3 ... Base body 3m ... Male screw 3t ... Thin diameter part 4 ... 1st nut 5 ... 2nd nut 5f ... Anti-rotation surface 6 ... Adhesive 7 ... Anti-rotation 8a ... Shaft body 8b ... Valve body
8c ... sliding member 8d ... rotating ring 9 ... coil spring 10 ... endoscope
DESCRIPTION OF SYMBOLS 11 ... Insertion part 12 ... Operation part 12S ... Internal space 13 ... Eyepiece part 14 ... Light guide 14c ... Connection connector 15 ... Tip part 16 ... Bending part 17 ... Flexible pipe part
DESCRIPTION OF SYMBOLS 18 ... Bending prevention part 19 ... Bending operation lever 20 ... Treatment instrument insertion port 22 ... Case body
22h: Through hole 23 ... Base arrangement portion 23d ... Bottom 23f ... Positioning surface
23h ... Positioning hole 23i ... Space plane 23o ... External plane 23t ... Contact plane
30 ... Water leakage detection base 31 ... Base body 31a ... Large diameter part 31b ... Small diameter part
31c ... Externally exposed portion 31cm ... first male screw 31d ... exposed portion 31dm in space ... second male screw 31e ... ring groove 31f ... rotation restricting surface
31h ... Stepped through hole 32 ... Rotating ring 33 ... Sliding member 34 ... Valve element 35 ... Shaft body
36 ... Valve member 37 ... Holding member 38 ... Coil spring 39 ... Cam pin
41 ... 1st nut 42 ... 2nd nut 42f ... Anti-rotation surface 50 ... Anti-rotation member 51 ... Inner fitting surface 52 ... Outer fitting surface 61 ... O-ring

Claims (4)

A partition wall that shuts off the internal space and the outside;
A through hole that is provided in the partition wall and communicates the internal space with the outside;
A first external thread that is exposed to the outside from the through hole is formed, a first exposed portion that is connected to the first exposed portion, and a second exposed from the through hole to the inner space side. A communicating member having an exposed portion and provided with at least one flat surface on an outer peripheral surface portion of the first exposed portion;
A fastening member that is screwed into the first male screw of the first exposed portion of the communication member and is arranged on the outside side so as to freely advance and retreat to the first exposed portion;
A bottom surface having a predetermined depth from the outer surface of the partition wall, and a positioning hole having at least one positioning surface around the through hole;
It is formed with a predetermined thickness disposed in the positioning hole, and is disposed in contact with the outer fitting surface disposed in the positioning hole and disposed in contact with the positioning surface, and the plane of the first exposed portion. An anti-rotation member having at least one inner mating surface;
On the inner space side, a retaining member that is attached to the second exposed portion and restricts the communication member from slipping out to the outside of the through hole;
A fixing structure for a tubular member, comprising:   The tubular member fixing structure according to claim 1, wherein the retaining member is a nut screwed to a second male screw formed in the second exposed portion.   The tubular member fixing structure according to claim 2, wherein a thickness of the rotation stop member is equal to or less than a depth of the hole.   An endoscope vent having the tubular member fixing structure according to any one of claims 1 to 3.

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