JP2003220017A - Changeover dial for suction flow channels of endoscope and revolving dial structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the changeover dial for the suction channels of an endoscope, having a simple structure capable of being manufactured inexpensively. <P>SOLUTION: The changeover dial for the suction channels of the endoscope is equipped with an attaching member detachable to the opening part of a hollow space for connecting two treatment-tool insertion channels, a changeover operation member supporting the channel changeover valve for enabling a suction source to communicate with two treatment-tools insertion channels or cutting off the same from the treatment-tool insertion channels, the click recessed part and click projected part formed to one of the changeover operation member, which locks the changeover operation member at a plurality of different rotary positions and unlocks the same by the axial movement of the changeover operation member, and the attaching member and to the other one of them and an energizing member for energizing the changeover operation member in the locking direction of the click recessed part and the click projected part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a suction flow path switching dial and a rotating dial structure for an endoscope.

[0002]

2. Description of the Related Art An endoscope provided with two treatment instrument insertion channels that can also be used as suction channels, and a flow path switching means for switching the communication state with a suction source between the two channels. Are known. The flow path switching means is movable to a position where one channel is blocked from the suction source, a position where the other channel is blocked from the suction source, and a position where both channels are communicated with the suction source. A structure is known in which a valve is provided and the switching valve is rotated to the three positions by a dial provided on the outer surface of the endoscope. Conventionally, the rotation position of the dial for switching the suction passage is determined by a click mechanism including a click ball made of metal that can move forward and backward and a click hole that can be engaged with the click ball. However, it is desired to reduce the production cost by making the dial for switching the suction flow path a simpler structure.

Even for dials other than those for switching the suction flow path, it is desired that the click mechanism has a simple structure.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a suction flow path switching dial for an endoscope which has a simple click mechanism structure and can be obtained at low cost. Another object of the present invention is to provide a rotary dial structure which has a simple structure and can be manufactured at low cost.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an endoscope having a rotatable suction channel switching dial, which has a channel switching valve for connecting or blocking a suction source to each of the two treatment instrument insertion channels. The suction channel switching dial has the following structure. That is, the suction flow path switching dial of the present invention is a mounting member that is attachable / detachable to / from an opening of a hollow space that connects two treatment instrument insertion channels; a flow path switching valve is supported, and the mounting member is relatively rotatable and axially One of the switching operation member and the attachment member, one of the switching operation member and the other of the mounting members, the switching operation member being supported so as to be able to move back and forth; the switching operation member is locked at a plurality of different rotational positions, and the locking is released by axial movement of the switching operation member. And a biasing member that biases the switching operation member in the engaging direction of the click recess and the click projection.

In order to reduce the manufacturing cost, it is preferable that the switching operation member and the mounting member are molded products of synthetic resin, and the click concave portion and the click convex portion are formed in the molding process.

It is preferable that the switching operation member and the mounting member further include an index for displaying the rotational position of the switching operation member.

As a specific application example of the present invention, the attachment member is a bottomed ring body having a bottom portion that covers the opening of the hollow space connecting the two treatment instrument insertion channels, and the switching operation member is attached to the attachment member. The click concave portion and the click convex portion may be supported on the outer surface side of the member bottom portion and formed on the surfaces of the attachment member bottom portion and the switching operation member that face each other.

In this application example, a circular through hole is formed in the bottom portion of the annular mounting member, and the flow passage switching valve is provided on the inner surface side of the bottom portion of the mounting ring member and is different from the switching operation member. A non-circular cross-section provided on the shaft, wherein a valve member of the member is provided, and a shaft portion provided on the valve member is fitted in a through hole of the attachment member so as to be rotatable and slidable in the axial direction. It is preferable to have a structure in which is protruded from the through hole and is fixed to the switching operation member so as not to be relatively rotatable and integrally movable in the axial direction.

At this time, the urging member may be a compression spring arranged between the valve member and the bottom of the mounting member.

Further, it is preferable that the through-hole of the mounting member and the shaft portion of the valve member are provided with a rotation angle limiting portion for restricting the maximum rotation angle of the valve member.

From the viewpoint of cost reduction, it is preferable that the valve member is also a molded product of synthetic resin like the mounting member and the switching operation member.

According to another aspect of the present invention, there is provided a rotatable suction channel switching dial having a channel switching valve for connecting or disconnecting each of the two treatment instrument insertion channels and the suction source. In the endoscope, the suction flow path switching dial is attachable / detachable to / from an opening of a hollow space that connects two treatment instrument insertion channels, and has a bottom that covers the opening and a circular through hole that penetrates the bottom. A bottomed mounting ring having; a flow path switching valve located on the inner surface side of the endoscope with respect to the mounting ring, and a shaft portion fitted in a through hole of the mounting ring so as to be rotatable and axially advanceable and retractable. A valve member having: a switching operation member located on the outer surface side of the endoscope with respect to the mounting ring and fixed so as not to be rotatable relative to the shaft portion of the valve member and integrally movable in the axial direction; the switching operation member and the mounting ring A plurality of the switching operation members provided on the surfaces of the bottom facing each other A click concave portion and a click convex portion which are locked at different rotational positions and are unlocked by axial movement of the switching operation member with respect to the mounting ring; and the valve member disposed between the valve member and the mounting ring bottom portion. The switching operation member is urged in the engaging direction of the click concave portion and the click convex portion via the switching operation member;

In each of the above aspects, the suction flow path switching dial has the mounting member, the valve member, the switching operation member and the biasing member sub-assembled, and is clicked by the click concave portion and the click convex portion when the endoscope is not mounted. It is preferable that the mechanism is a combined body.

The present invention also relates to a rotary dial structure not limited to switching the suction flow path, and has a fixed ring having a bottom and a circular through hole at the bottom; and facing one of the front and back sides of the bottom of the fixed ring. A first rotating member having a shaft portion that is fitted in the through hole so as to be rotatable and movable in the axial direction; the shaft portion of the first rotating member faces the other of the front and back of the bottom portion of the fixed ring. A second rotating member which is fixed so as not to be relatively rotatable and integrally movable in the axial direction; a plurality of different second rotating members formed on the opposing surfaces of the second rotating member and the bottom of the fixed ring; A click concave portion and a click convex portion which are locked at a rotational position and are unlocked by axial movement of the second rotating member with respect to the fixed ring; and an arrangement between the first rotating member and the fixed ring bottom portion. The second rotary member is engaged with the click concave portion and the click convex portion via the first rotary member. It is characterized by having a; biasing member biases.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the appearance of the entire endoscope to which the present invention is applied. The endoscope includes a gripping operation unit 11 gripped by an endoscope operator, an insertion unit 12 inserted into an observation target, a connecting unit 13 connecting the insertion unit 12 and the gripping operation unit 11, and a gripping operation unit 11. It has a universal tube 14 extended from. The insertion portion 12 has a distal end portion 12.
a, a bending portion 12b that can be bent, and a flexible tube portion 12c having flexibility. The end of the universal tube 14 serves as a connector 15 that can be attached to and detached from a processor (not shown).

As shown in FIG. 2, two treatment instrument insertion channels 20A and 20B are arranged in the insertion portion 12, and the outlets of the treatment instrument insertion channels 20A and 20B are formed in the insertion portion 12a. Has been done. On the other hand, the treatment instrument insertion port projection 21 provided on the connecting portion 13 is formed with an inlet portion of the treatment instrument insertion channels 20A and 20B. A communication space (hollow space) 22 (see FIG. 3) that communicates the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B is formed in the treatment instrument insertion port projection 21.
A suction channel 23 is connected to the. A suction cylinder 24 is provided in the middle of the suction channel 23,
The suction channel 23 further extends from the suction cylinder 24 into the universal tube 14 and opens into a suction nipple 25 (FIG. 2) protruding from the connector 15. A tube extending from a suction pump (suction source) 27 can be attached to and detached from the suction nipple 25, and a negative pressure can be applied to the suction channel 23 by operating the suction pump. A suction button 26 projecting to the outer surface of the gripping operation unit 11 is supported in the suction cylinder 24 so as to be able to move forward and backward. When the suction button 26 is not pressed, suction on the side of the universal tube 14 sandwiching the suction cylinder 24 is performed. The suction channel 26 on the side of the channel 23 and the communication space 22 is blocked by the suction button 26, and a negative pressure does not act on the communication space 22. On the other hand, when the suction button 26 is pressed, this interruption is released and a negative pressure acts on the communication space 22 side.

As shown in FIG. 3, the treatment tool insertion port projection 21
The channel connection member 30 provided therein has a pair of hollow conduits 31A and 31B communicating with the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B. Specifically, a rigid relay tube 32 fixed to the ends of the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B.
A and 32B are connected to the channel connecting member 30 via the fixed frame 33, and the flow paths formed in the relay tubes 32A and 32B and the fixed frame 33 communicate with the hollow conduits 31A and 31B. . In addition, the hollow conduit 31A and the hollow conduit 3
Each of the outlet portions of 1B has a hollow cylindrical ferrule fixing member 3
4A and 34B are fixed, and each base fixing member 34
For A and 34B, a cylindrical base projection 35 is provided through a screw.
A and 35B are removable. Mouth protrusion 35A,
35B is substantially a treatment instrument insertion channel 20A, 20B
The outlet of each of the mouthpiece projections 35A,
A treatment tool (not shown) can be attached to and detached from 35B. A rubber cover 36 is sandwiched between the mouthpiece protrusions 35A and 35B and the channel connection member 30 so that the channel connection member 30 is not exposed to the outer surface of the treatment instrument insertion port protrusion 21.

The channel connecting member 30 is further provided with the above-mentioned communication space 22 between the hollow pipe line 31A and the hollow pipe line 31B.
Are formed. As shown in FIG. 3 and FIG. 5, the communication space 22 has a cylindrical inner peripheral surface, and a pair of hollow pipes 31A and 31B communicating with each other are provided at positions facing the inner peripheral surface. Radial communication passages 41A and 41B are formed. As shown in FIG. 5, the bottom of the communication space 22 has an opening penetrating the channel connecting member 30, and the suction channel 23 is connected to this opening.

As shown in FIGS. 4 and 5, the upper part of the communication space 22 in the channel connection member 30 is formed as a cylindrical projection protruding toward the outer surface of the endoscope, and the treatment tool insertion port projection 21 has a projection 21. A circular opening is formed so that the cylindrical protrusion projects outward. An annular flange protrusion 37 is formed at the edge of the circular opening.
A rotation restricting concave portion 38 is formed by cutting off a part of the outer edge portion of the.

The inside of the cylindrical protrusion of the channel connecting member 30 protruding from the treatment instrument insertion port protrusion 21 has a communication space 22.
Is a hollow valve member insertion space (hollow space) 42 continuous with. The valve member insertion space 42 has a larger inner diameter than the communication space 22, and an annular valve member insertion restriction surface 43 is formed between the communication space 22 and the valve member insertion space 42. Further, on the outer peripheral surface side of the cylindrical projection of the channel connection member 30, in the order from the upper end side, a snap ring engaging ring portion 44 (FIG. 4) in the circumferential direction, an annular mounting ring insertion restricting surface 45, O
An O-ring holding groove 47 for holding the ring 46 is formed. When the channel connecting member 30 is attached to the treatment tool insertion port projection 21 as shown in FIG.
Is inserted to the inner peripheral side of the flange convex portion 37, and the O-ring 4 is provided between the treatment instrument insertion port projection 21 and the channel connecting member 30.
It is liquid-tightly closed by 6.

When only the channel connecting member 30 is attached to the treatment instrument insertion port projection 21, the hollow conduit 31A is provided.
And the hollow pipe line 31B communicate with the communication space 22. A suction passage switching dial 50 for controlling a negative pressure action path to the treatment instrument insertion channels 20A and 20B can be attached to and detached from the channel connection member 30. As shown in FIGS. 5 and 6, the suction flow path switching dial 50 includes a valve member (first rotating member) that is inserted into the valve member insertion space 42.
51, a knob 52 fixed to the valve member 51 and rotating integrally with the valve member 51 (switching operation member, second rotating member) 52,
A mounting ring (mounting member, fixed ring) 53 located between the valve member 51 and the knob 52 is provided. Valve member 51, knob 5
Both 2 and the attachment ring 53 are molded articles of synthetic resin.

The valve member 51 has a large diameter portion 51a having a diameter corresponding to the inner diameter of the valve member insertion space 42 and a small diameter shaft portion 51b concentric with the large diameter portion 51a. A flow passage switching valve 55 having a fan-shaped cross section having a predetermined circumferential length is provided to project toward, and when the valve member 51 is inserted into the valve member insertion space 42, the flow passage switching valve 55 is connected to the communication space 22. Is located in. The outer peripheral surface of the flow path switching valve 55 is a cylindrical surface having a diameter corresponding to the inner peripheral surface of the communication space 22, and the inner peripheral surface has a shape that does not block the suction channel 23 (FIG. 3, FIG.
(See FIG. 5). Around the tip of the small diameter shaft portion 51b, a circumferential recess (rotation angle limiting portion) 56 is formed by cutting out a part of the outer peripheral surface, and has a non-circular cross-sectional shape. An O-ring holding groove 58 for holding the O-ring 57 is formed on the outer peripheral surface of the large diameter portion 51a.

The knob 52 is provided with a rotation restricting hole 60 on the lower surface side of the disk-shaped portion 52a facing the mounting ring 53, and four click recesses arranged at different positions in the circumferential direction around the rotation restricting hole 60. 61 (61-1 to 61-4) are formed. A screw hole 62 is formed on the inner side of the rotation restriction hole 60. The rotation restricting hole 60 has a non-circular inner surface shape in which the tip end of the small-diameter shaft portion 51b formed in the non-circular cross section is fitted so as not to be relatively rotatable. Of the four click recesses, the pair of click recesses 61-1 and 61-3 located at the radial opposite positions are more circumferential than the pair of click recesses 61-2 and 61-4 located at the radial opposite positions. The direction length is getting longer.

The mounting ring 53 is a concentric large and small cylindrical portion 53.
a, a ring-shaped bottomed body having a tubular portion 53b and a disc-shaped portion 53c forming the bottom of the tubular portion, and the disc-shaped portion 5
It has a circular through hole 65 penetrating the front and back of 3c and the cylindrical portion 53a having a small diameter. On the inner peripheral surface of the through hole 65, a rotation angle control protrusion (rotation angle limiting portion) 66 is provided in a protruding manner. On the other hand, a snap ring 67 is held on the inner peripheral surface of the outer cylindrical portion 53b of the mounting ring 53. The snap ring 67 is elastically deformable in the radial direction, and in the free state, the inner edge portion thereof projects beyond the inner peripheral surface of the tubular portion 53b.
Further, a rotation restricting projection 68 is provided on the cylindrical portion 53b in a direction opposite to the direction of the disc-shaped portion 53c.

As shown in FIG. 6, the disc-shaped portion 53c of the mounting ring 53 penetrates through the disc-shaped portion 53c on the side facing away from the cylindrical portions 53a and 53b, that is, on the outer surface side when mounted on the endoscope. Six click protrusions 69 (69-1 to 69-6) are formed at equal intervals in the circumferential direction around the hole 65. The six click protrusions 69 have the same shape.
Further, the disk-shaped portion 53c of the mounting ring 53 is provided with three rotational position indicators 70-1 to 70-3 on the outer edge side of the click convex portion 69 at equal intervals in the circumferential direction.

When assembling the suction flow path switching dial 50, first, the rotation angle control projection 66 is aligned with the mounting ring 53 so that the rotation angle control projection 66 is located in the circumferential recess 56, and the tip of the tubular portion 53a is aligned. The valve member 51 is inserted into the through hole 65 from the opening side.
The small-diameter shaft portion 51b is inserted. Then, the tip of the small diameter shaft portion 51 projects from the disc-shaped portion 53 c of the mounting ring 53.
At this time, as shown in FIG. 5, a compression coil spring (biasing member) 71 is inserted in advance between the disc-shaped portion 53c of the mounting ring 53 and the large diameter portion 51a of the valve member 51.

Subsequently, the disk-shaped portion 53c of the mounting ring 53
The knob 52 is mounted on the surface side of the click convex portion 69 formed therein, and the rotation regulating hole 60 is engaged with the tip of the small-diameter shaft portion 51b of the valve member 51. The rotation restricting hole 60 and the small-diameter shaft portion 51b have a non-circular cross-sectional shape, and by fitting them, the knob 52 and the valve member 51 are coupled so as not to rotate relative to each other.

Further, a screw 72 is inserted into a screw insertion hole 73 penetrating the valve member 51 in the axial direction, and the screw 72
Is screwed into a screw hole 62 provided in the knob 52. As shown in FIG. 5, when the screw 72 is screwed in all the way, the small-diameter shaft portion 5
The tip of 1b contacts the bottom of the rotation restricting hole 60, and the valve member 5
The 1 and the knob 52 cannot be moved relative to each other in the axial direction as well as the relative rotation.

In this state, the suction channel switching dial 50 is
The outer peripheral surface of the small-diameter shaft portion 51b is fitted to the inner peripheral surface of the through hole 65 so as to be rotatable and axially movable, and the combined body of the valve member 51 and the knob 52 rotates with respect to the mounting ring 53. It is movably and axially movably supported. The valve member 51
The maximum rotation angle of the combined body of the knob 52 and the knob 52 is limited by the contact between the both end surfaces of the circumferential recess 56 and the rotation angle control protrusion 66.

The compression coil spring 71 is compressed in the axial direction with the suction passage switching dial 50 assembled, and the valve member 51 is attached downward in FIG. 5 due to the restoring force to release the compression. Energize. The urging force is transmitted to the knob 52 via the valve member 51, and the knob 52 is urged in a direction approaching the attachment ring 53 (disk-shaped portion 53c).

The suction flow path switching dial 50 sub-assembled as described above is provided with the rotation restricting projection 6 provided on the mounting ring 53.
8 is attached to the channel connecting member 30 at an angular position where it engages with the rotation restricting recess 38 on the side of the treatment instrument insertion port projection 21. Due to the engagement of the rotation restricting projection 68 and the rotation restricting recess 38, the mounting ring 53 cannot rotate with respect to the treatment instrument insertion port projection 21. Further, the snap ring 67 provided on the inner peripheral surface of the attachment ring 53 engages with the snap ring engagement ring portion 44, so that the attachment ring 53 is attached to the channel connection member 30.
Is locked in the axial direction. Channel connecting member 30
The maximum insertion position of the attachment ring 53 with respect to is regulated by the attachment ring insertion regulation surface 45.

When the mounting ring 53 is attached to the channel connecting member 30, the large diameter portion 51a of the valve member 51 is as shown in FIG.
Is inserted in the valve member insertion space 42, and the flow path switching valve 55 is located in the communication space 22. The valve member 51 having the flow path switching valve 55 has a fixed rotation angle with respect to the channel connection member 30 (a rotation angle control protrusion 66 of the mounting ring 53 whose rotation is restricted).
Of the flow path switching valve 55 inserted into the communication space 22 in accordance with the rotation of the valve member 51. A position where neither the passage 41A nor the radial communication passage 41B is blocked (FIG. 7),
It is moved to a position that closes the radial communication passage 41A (FIG. 8) and a position that closes the radial communication passage 41B (FIG. 9). In the state of FIG. 7, the negative pressure from the suction channel 23 reaches both the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B, and in the state of FIG. 8, the negative pressure is the treatment instrument insertion channel 20.
A negative pressure is not applied to the treatment instrument insertion channel 20A extending only to B, and conversely in the state of FIG.
Negative pressure acts only on 0A, and the treatment instrument insertion channel 20B
Negative pressure does not act on. Therefore, in the state of FIG.
Treatment tool insertion channel 20A and treatment tool insertion channel 2
It is possible to perform suction work using both 0B and
In this state, one of the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B can be used as a suction conduit and the treatment instrument can be inserted into the other. Since the O-ring 57 closes the space between the channel connecting member 30 and the valve member 51 in a liquid-tight manner, the communication space 22
The fluid sucked in does not leak to the outside through the valve member insertion space 42.

The suction passage switching dial 50 has a click mechanism for locking the passage switching valve 55 at the three rotational positions shown in FIGS. 7 to 9. As described above, the valve member 5
1 is movable in the axial direction with respect to the mounting ring 53, and when the suction flow path switching dial 50 is mounted on the channel connecting member 30, the valve member 51 is compressed by the compression coil spring 71.
As a result, the lower surface of the large-diameter portion 51a has a valve member insertion regulation surface 43
Is urged in the direction of abutting against. And the valve member 51
The knob 52 coupled with the urging member urges the disc-shaped portion 52a in the direction of approaching the disc-shaped portion 53c of the mounting ring 53, that is, in the direction of engaging the click concave portion 61 formed in each disc-shaped portion with the click convex portion 69. Has been done. By engaging the click concave portion 61 and the click convex portion 69, rotation of the combined body of the valve member 51 and the knob 52 with respect to the mounting ring 53 is restricted.

More specifically, the circumferential lengths of the click concave portions 61-1 and 61-3 are the same as the click convex portions 69.
It corresponds to two (and the space between them), and two click protrusions 69 can be simultaneously engaged with each. On the other hand, the click recess 61-2 and the click recess 61-
The shape of 4 corresponds to the single click convex portion 69. First, when the click convex portion 69-1 and the click convex portion 69-2 are engaged with the long click concave portion 61-1, when the long click concave portion 61-1 and the click convex portion 69-2 are engaged with each other in the radial direction, the long click concave portion 61-1 is located. Two click convex portions 69-4 and a click convex portion 69-5 are engaged with 61-3, and a click convex portion 69-3 is clicked on the short click concave portion 61-2 and a click concave portion 61-4 is clicked. The convex portions 69-6 are engaged with each other. At this time, the flow path switching valve 55 is in the position shown in FIG. Each click projection 69
Since the engagement relationship between the click recess 61 and the click recess 61 is maintained by the biasing force of the compression coil spring 71, the valve member 51 and the knob 52.
Is restricted, and the flow path switching valve 55 maintains the position shown in FIG. That is, the state in which the suction valve is opened for both the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B is maintained. An index not shown is provided on the upper surface side (the surface opposite to the click recess 61) of the disk-shaped part 52a of the knob 52, and in this state, the index is located at the circumferential position corresponding to the rotational position index 70-1. is there. The endoscope user can confirm the state of the flow path switching valve 55 by looking at the index position.

To stop the suction in the treatment instrument insertion channel 20A, the knob 52 is rotated clockwise from the state shown in FIG. Since the click convex portion 69 and the click concave portion 61 are engaged with each other, resistance is applied to this rotation. However, when a force is still applied in the rotation direction, the circumferential end surface of the click concave portion 61 causes the click convex portion 69 to move. The knob 52 slightly moves in a direction away from the mounting ring 53 (upward in FIG. 5) in an attempt to get over the circumferential end surface. This knob 52
By the axial movement of the click convex portion 69 and the click concave portion 61, the locking is released and the knob 52 can be rotated. At this time, the valve member 51 along with the knob 52 moves in the axial direction while compressing the compression coil spring 71.

By rotating the knob 52, each click recess 6
When 1 reaches the position of the corresponding click convex portion 69, the valve member 51 and the knob 52 move downward in FIG. 5 by the urging force of the compression coil spring 71, and the click concave portion 61 again moves to the click convex portion 69. Engage. Specifically, FIG.
When the knob 52 is rotated by one step in the clockwise direction from the above state, the two click convex portions 69-2 and 69-3 engage with the long click concave portion 61-1 and the click concave portion 61-1 is engaged. Two click protrusions 69-5 and 69-6 are engaged with respect to -3. Further, the short click concave portion 61-2 has a click convex portion 69-4 and a click concave portion 6
The click convex portions 69-1 are engaged with 1-4, respectively. At this time, since the flow path switching valve 55 moves to the position shown in FIG. 8 and closes the radial communication passage 41A, the treatment tool insertion channel 2
No negative pressure is applied to 0A. Further, the index (not shown) provided on the knob 52 moves to the circumferential position corresponding to the rotational position index 70-3. By seeing this index position by the endoscope user, it can be seen that the suction force acts only on the treatment instrument insertion channel 20B side. The rotational positions of the valve member 51 and the knob 52 are held by the engagement relationship between the click concave portion 61 and the click convex portion 69.

On the contrary, when the negative pressure is stopped with respect to the treatment instrument insertion channel 20B, the knob 52 is rotated counterclockwise from the state shown in FIG. Similar to the above-described clockwise rotation, resistance is applied to the rotating operation of the knob 52, but when a certain amount of force is applied, the circumferential end surface of the click concave portion 61 gets over the click convex portion 69, and the knob 52 is attached to the mounting ring 53. Can be lifted from. And with the knob 52, the valve member 51
Also lifts while compressing the compression coil spring 71. When the knob 52 rotates by a predetermined angle, each click concave portion 61 reaches the position of the corresponding click convex portion 69 next, and the click concave portion 61 is engaged with the click convex portion 69 by the biasing force of the compression coil spring 71. Specifically, the two click protrusions 69-1 and 69-6 are engaged with the long click recess 61-1 and the two click protrusions 69-3 are engaged with the click recess 61-3. -3 and the click protrusion 69-4 engage with each other. Further, the click convex portion 69-2 engages with the short click concave portion 61-2, and the click convex portion 69-5 engages with the click concave portion 61-4. At this time, the flow path switching valve 5
5 moves to the position shown in FIG. 9 to close the radial communication passage 41B, and negative pressure is not applied to the treatment instrument insertion channel 20B. Further, an index (not shown) provided on the knob 52 moves to a circumferential position corresponding to the rotational position index 70-2, and by observing this index position, the treatment instrument insertion channel 20A
It can be seen that the suction force acts only on the side. The rotational positions of the valve member 51 and the knob 52 are held by the engagement relationship between the click concave portion 61 and the click convex portion 69.

If necessary, the circumferential edge of the click concave portion 61 or the click convex portion 69 is shaped so as to easily disengage the click concave portion 61 and the click convex portion 69 when the knob 52 is rotated. An inclined surface may be formed.

Suction channel switching dial 5 having the above structure
At 0, the click feeling is given to the knob 52 by the plurality of click concave portions 61 and the click convex portions 69 formed on the facing surfaces of the disk-shaped portions 52a and 53c of the knob 52 and the mounting ring 53, respectively. That is, since a click structure is directly formed on each of the knob 52, which is an operation member for switching the valve position, and the attachment ring 53 for attaching the knob 52 to the endoscope body, a click ball or the like is formed. No separate member is required. Therefore, the number of parts is small, the structure is simple, and easy assembly and low cost manufacturing are possible.

All the click mechanisms are provided on the suction channel switching dial 50 side, and the operation and accuracy of the click mechanism can be checked in the sub-assembly state of the suction channel switching dial 50. In other words, since there is no member related to the click mechanism on the endoscope body side, even if there is a problem with the click mechanism, it is only necessary to replace or adjust the sub-assembled suction flow path switching dial 50 side. Therefore, the manufacturing around the dial becomes easy and the maintainability is excellent.

The external appearance exposure member of the endoscope is made of a non-conductive material such as synthetic resin or rubber for the purpose of preventing electric shock during use of the high-frequency cautery treatment tool, and the suction channel switching dial 50. Also in the above, the knob 52 and the mounting ring 53 exposed on the outer surface of the treatment instrument insertion port projection 21 are molded articles of synthetic resin. Since the click concave portion 61 and the click convex portion 69 are the concave portion and the convex portion on the surface of the molded product, respectively, they can be formed in the molding process of the knob 52 and the mounting ring 53, and a conventional click mechanism using a click ball or the like. On the other hand, it is possible to reduce the substantial number of man-hours in manufacturing. In other words, since the click mechanism portion is provided on the member that needs to be a synthetic resin molded product in a form that can be formed in the molding process, it is possible to further reduce the cost because it does not take time and effort for manufacturing. Further, in the present embodiment, the valve member 51 located inside the endoscope is also made of synthetic resin, which is advantageous in terms of cost.

The present invention is not limited to the illustrated embodiments. For example, although the embodiment of the suction flow path switching dial of the endoscope has been described above, the rotary dial structure characterized by the present invention can be applied to a dial with a click mechanism for other purposes.

[0044]

As is apparent from the above, according to the present invention, it is possible to obtain a suction flow path switching dial and a rotary dial structure for an endoscope which are simple in structure and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is an external view of an endoscope having a suction channel switching dial to which the present invention is applied.

FIG. 2 is an internal structure diagram showing an outline of a fluid flow passage in the endoscope of FIG.

FIG. 3 is a cross-sectional view of a treatment instrument insertion port projection of the endoscope of FIG. 1 in a plane direction.

FIG. 4 is a plan view showing a state in which a flow path switching dial is removed from a treatment instrument insertion port projection.

FIG. 5 is a cross-sectional view in the vicinity of a suction flow path switching dial.

FIG. 6 is an exploded perspective view of a suction channel switching dial.

FIG. 7 is a diagram showing a state in which the flow path control valve communicates both the two treatment instrument insertion channels with the suction source.

FIG. 8 is a diagram showing a state in which the flow path control valve allows only one treatment tool insertion channel to communicate with the suction source.

FIG. 9 is a view showing a state in which the flow path control valve allows only the other treatment tool insertion channel to communicate with the suction source.

[Explanation of symbols]

11 Grip operation unit 12 Insert 13 Connection 14 universal tubes 15 connectors 20A 20B treatment instrument insertion channel 21 Treatment tool insertion port protrusion 22 Communication space (hollow space) 23 Suction channel 24 suction cylinder 25 suction nipples 26 Suction button 27 Suction pump (suction source) 30 channel connection member 31A 31B Hollow pipeline 32A 32B Relay tube 33 fixed frame 34A 34B Base fixing member 35A 35B Cap protrusion 36 rubber cover 37 Flange protrusion 38 Rotation restriction recess 41A 41B Radial communication passage 42 Valve member insertion space (hollow space) 43 Valve member insertion regulation surface 44 Snap ring engaging ring 45 Mounting ring insertion restriction surface 46 O-ring 47 O-ring holding groove 50 Suction channel switching dial 51 Valve member (first rotating member) 51a Large diameter part 51b Small diameter shaft 52 Knob (switching operation member, second rotating member) 52a disk-shaped part 53 Mounting ring (mounting member, fixed ring) 55 Flow path switching valve 53a 53b Cylindrical part 53c Disk-shaped part 56 Circumferential recess (rotation angle limiter) 57 O-ring 58 O-ring holding groove 60 rotation restriction hole 61 (61-1 to 61-4) Click recess 62 screw holes 65 through holes 66 Rotation angle control protrusion (rotation angle limiting part) 67 Snap ring 68 Rotation restriction protrusion 69 (69-1 to 69-6) Click convex part 70-1, 70-2, 70-3 Rotational position index 71 Compression coil spring (biasing member) 72 screws 73 screw insertion hole

Claims (12)

[Claims] 1. A suction source; two treatment instrument insertion channels;
And a suction flow channel switching dial that is rotatable and has a flow channel switching valve that connects or disconnects a suction source with each of the two treatment instrument insertion channels, and the suction flow channel switching dial. Is a mounting member that is attachable to and detachable from an opening of a hollow space that connects the two treatment instrument insertion channels; supports the flow path switching valve, and is supported by the mounting member so as to be rotatable relative to and axially advanceable and retractable. A switching operation member; a switching operation member and a click recess formed in one or the other of the mounting members, which locks the switching operation member at a plurality of different rotational positions and releases the locking by axial movement of the switching operation member. A suction flow path switching dial for an endoscope, comprising: a click convex portion; and a biasing member that biases the switching operation member in an engaging direction of the click concave portion and the click convex portion. 2. The suction flow path switching dial according to claim 1, wherein the switching operation member and the mounting member are molded products of synthetic resin, and the click concave portion and the click convex portion are formed in a molding step. Suction channel switching dial. 3. The suction passage switching dial according to claim 1, wherein the switching operation member and the attachment member further include an index for displaying a rotational position of the switching operation member. Switching dial. 4. The suction passage switching dial according to claim 1, wherein the attachment member is a bottomed ring body having a bottom portion that covers the opening of the hollow space, A suction flow path switching dial for an endoscope, wherein the operating member is supported on the outer surface side of the bottom portion of the mounting member, and the click concave portion and the click convex portion are formed on mutually opposing surfaces of the bottom portion of the mounting member and the switching operating member. 5. The suction passage switching dial according to claim 4, wherein a circular through hole penetrating the bottom portion of the annular mounting member; and the passage switching valve located on the inner surface side of the bottom portion of the mounting member. A valve member which is provided separately from the switching operation member; and a shaft portion provided on the valve member is fitted in the through hole so as to be rotatable and slidable in the axial direction, and the shaft. A suction flow path switching dial for an endoscope, in which a non-circular cross-section portion provided in the portion is fixed to the switching operation member so as not to be rotatable relative to the switching operation member and integrally movable in the axial direction. 6. The suction flow path switching dial according to claim 5, wherein the biasing member is a compression spring disposed between the valve member and the bottom portion of the mounting member. Switching dial. 7. The suction passage switching dial according to claim 6, wherein the through hole of the mounting member and the shaft portion of the valve member are
A suction flow path switching dial for an endoscope, in which a rotation angle limiting portion that restricts the maximum rotation angle of the valve member is formed. 8. The suction flow path switching dial according to claim 5, wherein the valve member is a synthetic resin molded product. 9. The suction channel switching dial according to claim 5, wherein the suction channel switching dial is sub-assembled with the attachment member, the valve member, the switching operation member, and the urging member. A suction flow path switching dial for an endoscope, which is a combined body in which a click mechanism including the click concave portion and the click convex portion functions when the endoscope is not attached. 10. A suction flow passage switching dial, which has a suction source; two treatment tool insertion channels; and a flow passage switching valve that connects or disconnects each of the two treatment tool insertion channels with the suction source. In the endoscope including ;, the suction channel switching dial is attachable to and detachable from an opening of a hollow space that connects the two treatment instrument insertion channels, and penetrates the bottom and a bottom that covers the opening. A bottomed mounting ring having a circular through hole; located on the inner surface side of the endoscope with respect to the mounting ring, and the flow path switching valve;
A valve member having a shaft portion that is rotatable in the through hole and is capable of moving forward and backward in the axial direction; is positioned on the outer surface side of the endoscope with respect to the mounting ring and is not rotatable relative to the shaft portion of the valve member. And a switching operation member that is fixed so as to be integrally movable in the axial direction; the switching operation member provided on the mutually opposing surfaces of the switching operation member and the mounting ring bottom portion is locked at a plurality of different rotational positions, and A click concave portion and a click convex portion that release the locking by axial movement of the switching operation member; and a switching concave member arranged between the valve member and the mounting ring bottom portion, and the switching operation member and the click concave portion via the valve member. A suction flow path switching dial for an endoscope, comprising: a biasing member that biases the click convex portion in an engaging direction. 11. The suction passage switching dial according to claim 10, wherein the attachment passage, the valve member, the switching operation member and the urging member are sub-assembled in the suction passage switching dial, and the suction passage switching dial is not attached to the endoscope. A suction flow path switching dial for an endoscope, which is a combined body in which a click mechanism including the click concave portion and the click convex portion functions in a state. 12. A fixed ring having a bottom and a circular through hole at the bottom; a shaft portion facing one of the front and back of the bottom portion of the fixed ring and fitted in the through hole so as to be rotatable and forward and backward in the axial direction. A first rotating member having a second rotating member that faces the other of the front and back of the bottom portion of the fixed ring, and the shaft portion of the first rotating member is fixed so as not to be relatively rotatable and integrally movable in the axial direction. A rotation member of the second rotation member, which is formed on the opposing surface of the second rotation member and the bottom of the fixed ring, locks the second rotation member at a plurality of different rotation positions, and fixes the second rotation member with respect to the fixed ring. A click concave portion and a click convex portion that release the locking by axial movement; and a second rotation that is arranged between the first rotating member and the fixed ring bottom portion, and that is provided through the first rotating member. A rotating diamond comprising a biasing member for biasing the member in the engagement direction of the click concave portion and the click convex portion. Le structure.