JP2003245247A - Suction switching mechanism for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suction switching mechanism for endoscopes which can prevent excessive suction attributed to endo-therapy insertion channels. <P>SOLUTION: The suction switching mechanism for endoscopes is provided with a suction source, a communication space made to communicate with the suction source, a pair of treating instrument insertion channels, and a passage switching valve which is located in the communication space and accomplishes switching operations between two one-side communication positions at which the suction source is made to communicate with any one of the pair of treating instrument insertion channels. When the passage switching valve communicates with at least one of the pair of channels, a suction force adjusting passage is provided which makes the other endo-therapy channel than the one communicating with the suction source to communicate with the suction source in a communication area smaller than that in which the endo-therapy instrument insertion channel communicates with the suction source. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a suction switching mechanism for an endoscope.

[0002]

2. Description of the Related Art When performing suction with a medical endoscope, a negative pressure may directly act on a mucous membrane by accidentally sucking a body tissue that is not a suction target. At this time, if the suction force is large, the mucous membrane part may bleed or so-called suction octopus may occur. When bleeding occurs, it is difficult to diagnose the lesion site, and since suction octopus is difficult to distinguish from polyps, the examination is hindered in any case.

In particular, a so-called two-channel type endoscope is provided with two treatment instrument insertion channels that can also be used as suction channels, and a flow path switching valve that switches the communication state with the suction source between these two channels. In the mirror, it is desired that when the suction force of one of the channels is shut off by the flow path switching valve, the suction force acting on the other channel does not become excessive.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an endoscope suction switching mechanism capable of preventing excessive suction by a treatment instrument insertion channel.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a suction source; a communication space communicating with the suction source; a pair of treatment instrument insertion channels communicating with the communication space; and a suction source located in the communication space, with a pair of treatments. In a suction switching mechanism of an endoscope provided with a flow passage switching valve capable of performing switching operation to two one-sided communication states for switching and communicating with either one of the tool insertion channels, When at least one of them is in a communication state, the other treatment tool insertion channel different from the one treatment tool communication channel communicating with the suction source is connected to the one treatment tool insertion channel and the suction source. It is characterized in that it has a suction force adjusting flow path for communicating with the suction source with a communication area smaller than the area.

In the above-mentioned one-way communication state, when the communication area of one treatment instrument insertion channel completely communicating with the suction source and the suction source is 100, the other treatment instrument insertion channel communicates with the suction source. The area is preferably 5 to 10.

For example, the communication space has a cylindrical inner peripheral surface in which a pair of treatment instrument insertion channels open at different positions in the circumferential direction, and the flow path switching valve has a cylindrical outer peripheral surface having a cylindrical shape of the communication space. While being slidably in contact with the inner peripheral surface, the two one-sided communication states are rotated, and the recess formed on the inner peripheral surface of the communication space or the outer peripheral surface of the flow path switching valve is used as the suction force adjusting flow path. You can

In addition to the above two one-way communication states, the flow path switching valve may be able to be switched to a two-way communication state in which the suction source communicates with both of the pair of treatment instrument insertion channels.

[0009]

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 at the tip 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 22 (FIG. 3) that allows the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B to communicate with each other is provided in the treatment instrument insertion port projection 21.
(See reference) is formed, and the suction channel 23 is connected to the communication space 22. A suction cylinder 24 is provided in the middle of the suction channel 23, and the suction channel 23 is further opened to a suction nipple 25 (FIG. 2) extending from the suction cylinder 24 into the universal tube 14 and protruding from the connector 15. is doing. Suction nipple 25
A tube extending from a suction pump (suction source) 27 can be attached to and detached from the suction pump, 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 grip operation portion 11 is supported in the suction cylinder 24 so as to be able to move forward and backward. The suction channel 23 and the suction channel 23 on the side of the communication space 22 are blocked by the piston of the suction button 26, so that the communication space 22
Negative pressure does not act on. In this state, the suction button 26
The outside air is sucked through the opening formed at the top of the. On the other hand, when the suction button 26 is pressed while closing the top opening of the suction button 26, this interruption is released and a negative pressure acts on the communication space 22 side.

As shown in FIG. 3, the treatment instrument insertion port projection 21
The channel connection member 30 provided therein has a pair of hollow conduits (treatment instrument insertion channels) 31A, 3A that communicate with the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B.
1B is formed. Specifically, the hard relay tubes 32A and 32B fixed to the ends of the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B are connected to the channel connection member 30 via the fixing frame 33, and the relay tubes 32A and 32B. The flow path formed in the fixed frame 33 communicates with the hollow conduit 31A and the hollow conduit 31B. In addition, at the outlets of the hollow pipeline 31A and the hollow pipeline 31B,
Hollow cylindrical cap fixing members 34A, 34B are fixed, and cylindrical cap projections 35A, 35B are fixed to the respective cap fixing members 34A, 34B via screws.
The mouthpiece protrusions 35A and 35B substantially form the entrances of the treatment instrument insertion channels 20A and 20B, and the treatment instrument can be inserted into the respective treatment instrument insertion channels 20A and 20B. The cap fixing members 34A and 34B made of an insulating material and the rubber cover 36 are sandwiched between the cap projections 35A and 35B and the channel connecting member 30, and the channel made of a metal material is provided by these insulating members. The connecting member 30 has the treatment tool insertion port projection 21.
It is prevented from being exposed on the outer surface of the. Also, the protrusion 3
Forceps plugs 39A and 39B (FIG. 1) can be attached to and detached from 5A and 35B.

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 the pair of radial communication passages 4 that are open at different positions in the circumferential direction of the inner peripheral surface.
1A and 41B are formed. The radial communication passage 41A is in the hollow pipeline 31A, and the radial communication passage 41B is in the hollow pipeline 31A.
It communicates with B respectively. 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 42 continuous with the above.
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 connecting member 30, in the order from the upper end side, a snap ring engaging ring portion 44 (FIG. 5) in the circumferential direction, an annular mounting ring insertion restricting surface 45, O Ring 46
An O-ring holding groove 47 for holding is formed. When the channel connecting member 30 is attached to the treatment instrument insertion port protrusion 21 as shown in FIG. 5, the O-ring holding groove 47 is inserted to the inner peripheral side of the flange protrusion 37, and the treatment instrument insertion port protrusion 2
A space between 1 and the channel connection member 30 is liquid-tightly closed by an O-ring 46.

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 flow path 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 51 that is inserted into the valve member insertion space 42, and a valve member 51.
A knob 52 that is fixed to the valve member 51 and rotates integrally with the valve member 51,
A mounting ring 53 is provided between the valve member 51 and the knob 52. The valve member 51, the knob 52, and the mounting ring 53 are all synthetic resin molded products.

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. Around the tip of the small-diameter shaft portion 51b, a part of the outer peripheral surface is cut out to form a circumferential recessed portion 56, which has a non-circular cross-sectional shape. Also, the large diameter portion 51a
An O-ring holding groove 58 for holding the O-ring 57 is formed on the outer peripheral surface of the.

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. And 61 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 small diameter shaft portion 5 formed in a non-circular cross section.
It has a non-circular inner surface shape in which the tip end portion of 1b is fitted so as not to be relatively rotatable.

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. A rotation angle control projection 66 is provided on the inner peripheral surface of the through hole 65 so as to project therefrom. 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. In addition, the tubular portion 53
A rotation restricting protrusion 68 is provided on b in a direction opposite to 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 the endoscope is mounted. Six click protrusions 69 are formed at equal intervals in the circumferential direction around the hole 65. The six click protrusions 69 have the same shape. Further, on the disk-shaped portion 53c of the mounting ring 53c, on the outer edge side of the click convex portion 69,
Three rotational position indicators 70 are provided at equal intervals in the circumferential direction.

When assembling the suction flow passage 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 53c of the mounting ring 53c. At this time, as shown in FIG. 5, the compression coil spring 71 is previously inserted between the disc-shaped portion 53c of the mounting ring 53c and the large diameter portion 51a of the valve member 51.

Next, the disk-shaped portion 53 of the mounting ring 53c.
The knob 52 is provided on the side of the surface on which the click protrusion 69 is formed in
On the small diameter shaft portion 51b of the valve member 51.
Engage with the tip. 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 inserted.
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 restoring force for releasing the compression causes the valve member 51 to be attached downward in FIG. 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). That is, the urging force acts in the direction in which the click concave portion 61 on the knob 52 side and the click convex portion 69 of the mounting ring 53 are engaged, and the mounting ring 53 is caused by the engagement relationship between the click concave portion 61 and the click convex portion 69. Knob 52 and valve member 51 for
Is restricted (click stop). As described above, the coupled valve member 51 and knob 52 can move not only in the relative rotation with respect to the attachment ring 53 but also in the axial direction. The circumferential end surface of the click concave portion 61 gets over the click convex portion 69, the knob 52 is lifted from the mounting ring 53, and the click stop is released. Then, together 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.

The suction passage switching dial 50 sub-assembled as described above has 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 flow path switching valve 55 has a cylindrical outer peripheral surface having a diameter corresponding to the inner peripheral surface of the communication space 22, and the outer peripheral surface can be rotated by slidingly contacting the inner peripheral surface of the communication space 22. it can. The inner peripheral surface of the flow path switching valve 55 has a cylindrical surface shape that does not block the suction channel 23 at any rotation position (see FIGS. 3 and 5).

The valve member 51 having the flow path switching valve 55 has a constant rotation angle with respect to the channel connection member 30 (the rotation angle control projection 66 of the mounting ring 53 whose rotation is regulated is the circumferential recess 5).
The flow path switching valve 55 inserted into the communication space 22 is connected to the radial direction communication passage 41A in accordance with the rotation of the valve member 51. A position that does not face any of the directional communication passages 41B (both communication state: FIG. 7), a position that faces the radial communication passage 41A (one communication state: FIG. 8), and a position that faces the radial communication passage 41B ( One side communication state: Moved to FIG. 9). Valve member 51
3 is shown in FIGS. 7 to 9 by the above-mentioned click mechanism.
Locked in one pivot position. The flow path switching valve 5
5 is in any of the rotational positions of FIGS. 7-9,
An O-ring 5 is provided between the channel connecting member 30 and the valve member 51.
Since it is liquid-tightly closed by 7, the fluid sucked into the communication space 22 does not leak to the outside through the valve member insertion space 42.

Further, as shown in FIG. 3, FIG. 5, and FIG. 7 to FIG. 9, in the communication space 22 forming the inner peripheral surface of the cylinder, there is a position adjacent to the radial communication passage 41A and the radial communication passage 41B. , A pair of suction force adjusting recesses (suction force adjusting flow path) 80
A and 80B are formed. More specifically, the suction force adjusting recesses 80A and 80B are rotated at both sides of the passage switching valve 55 shown in FIGS. 8 and 9 at positions adjacent to the communication space 22 and the radial communication passages 41A and 41B, respectively. It is formed at a position corresponding to the edge.

In the above structure, in the two communication states of FIG. 7, since the flow passage switching valve 55 completely opens the radial communication passage 41A and the radial communication passage 41B, the suction channel 2
The suction force acts evenly on both the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B without blocking the negative pressure from 3. That is, the treatment instrument insertion channel 20
A suction work using both A and the treatment instrument insertion channel 20B is possible.

When one of the treatment instrument insertion channel 20A and the treatment instrument insertion channel 20B is used as a suction conduit and the treatment instrument is inserted in the other, the knob 52 is rotated to switch the flow path. The valve 55 is moved to the position shown in FIG. 8 or 9. For example, at the position shown in FIG. 8, the flow path switching valve 55 has the radial direction communication passage 41A, that is, the treatment instrument insertion channel 2
In order to close 0A almost, the suction operation is performed on the side of the other treatment tool insertion channel 20B that is in communication with the suction pump 27.

By the way, the inner surface of the communication space 22 is not a uniform cylindrical shape, but a suction force adjusting recess 80A is formed continuously with the radial communication passage 41A, and the flow path switching valve 55 is connected to one side in FIG. Radial communication passage 4 when locked in position
A slight gap is secured between 1A and the communication space 22 by the suction force adjusting recess 80A. In other words, the flow path switching valve 55 incompletely closes the radial communication passage 41A following the treatment instrument insertion channel 20A, and allows a slight fluid flow between the treatment instrument insertion channel 20A and the communication space 22. ing. With this incompletely closed treatment instrument insertion channel 20A, the treatment instrument insertion channel 20
It is possible to adjust the negative pressure on the B side. For example, if the body mucous membrane is mistakenly sucked during the suction operation through the treatment instrument insertion channel 20B, an excessive suction force may act in the state as it is, but the suction force adjusting recess 80
Since a small communication area with the suction pump 27 is secured on the side of the other treatment instrument insertion channel 20A by A, the negative pressure can be released to this treatment instrument insertion channel 20A side. Therefore, the treatment instrument insertion channel 20
Excessive suction does not occur in B, and it is possible to prevent damage to the mucous membrane in the body and generation of suction octopus.

If the communicating area of the suction force adjusting recessed portion 80A is excessively large, the suction force on the side of the treatment instrument insertion channel 20B decreases, and unnecessary fine suction is generated on the side of the treatment instrument insertion channel 20A. Conversely, the suction force adjusting recess 80
If the communication area of A is too small, it will not function as the above-mentioned negative pressure relief flow path. Therefore, the suction force adjusting recess 80
The communication area of A is set appropriately. Specifically, when the communication area (radial communication passage 41B) between the treatment instrument insertion channel 20B (hollow conduit 31B) and the suction pump 27 (communication space 22) is set to 100, the suction force adjusting concave portion 80A.
The communication area of is set to be 5 to 10.

Further, in the communication space 22, the radial communication passage 4 is provided.
Another suction force adjusting recess 80B is formed at a position adjacent to 1A. Therefore, as shown in FIG.
Similarly, when rotating the radial communication passage 41B to the closed position and performing suction using the treatment instrument insertion channel 20A,
The negative pressure of the treatment instrument passage channel 20A can be adjusted by the other treatment instrument passage channel 20B. That is, when the flow path switching valve 55 is in the one-way communication position in FIG. 9, a small amount of fluid can flow between the communication space 22 and the radial communication passage 41B by the suction force adjusting recessed portion 80B, and the treatment tool. When an excessive suction force may act on the insertion channel 20A side, negative pressure can be released to the treatment instrument insertion channel 20B side through the suction force adjusting recessed portion 80B. Similar to the suction force adjusting recess 80A, the treatment instrument insertion channel 20A (hollow conduit 31A)
When the communication area (radial communication passage 41A) between the suction pump 27 (communication space 22) and 100 is set to 100, the communication area of the suction force adjusting recess 80B is set to be 5 to 10.

As described above, in the endoscope of this embodiment,
Each treatment instrument insertion channel 20A and 20B (hollow conduit 3
1A and 31B) and the communication space 22 are formed with suction force adjusting recesses 80A and 80B having a communication area smaller than that of the radial communication passages 41A and 41B, and one of the treatment tool insertion channels communicated with the suction source. Since it is possible to release the negative pressure of the suction source to the treatment instrument insertion channel on the opposite side,
It is possible to avoid damage to the mucous membrane in the body due to excessive suction and the occurrence of suction octopus.

In the above embodiment, the suction force adjusting recesses 80A and 80B are formed on the inner peripheral surface side of the communication space 22, but a recess having the same function is formed on the flow path switching valve 55 side. Good. 10 to 12 show this other embodiment, and the inner peripheral surface of the communication space 22 has a cylindrical surface shape without a recess. On the other hand, suction force adjusting recesses (suction force adjusting flow paths) 81A and 81B are formed at both ends of the fan-shaped flow path switching valve 55 by cutting out a part of the outer peripheral surface. As shown in FIG. 11, when the flow path switching valve 55 is rotated to the one-sided communication position that closes the radial direction communication passage 41A, a small amount between the treatment instrument insertion channel 20A and the communication space 22 is generated by the suction force adjustment recess 81A. Fluid communication is possible. Conversely, when the flow path switching valve 55 is rotated to the one-side communication position that closes the radial communication path 41B as shown in FIG. 12, the suction force adjusting recess 81B causes the treatment tool insertion channel 20B and the communication space 22 to be separated. A small amount of fluid communication between them is possible. Specifically, each treatment instrument insertion channel 20A,
20B (hollow pipelines 31A, 31B) and suction pump 27
Area of communication with (communication space 22) (radial communication passage 41A,
41B) is set to 100, the corresponding communicating areas of the suction force adjusting recesses 81A and 81B are set to be 5 to 10. Therefore, similar to the above-described embodiment, the negative pressure can be released to the treatment instrument insertion channel opposite to the side completely communicated with the suction source among the pair of treatment instrument insertion channels to prevent excessive suction. .

The present invention is not limited to the illustrated embodiment. For example, in the illustrated embodiment, the suction flow path switching dial 50 is used as the operation member for moving and locking the flow path switching valve 55, but the suction flow path switching dial 5 is used.
An operation member having a structure different from 0 may be used.

[0037]

As is apparent from the above, according to the present invention, it is possible to obtain a suction switching mechanism for an endoscope capable of preventing excessive suction by the treatment instrument insertion channel.

[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 opens both of the two treatment instrument insertion channels.

FIG. 8 is a diagram showing a state in which the flow path control valve closes one treatment tool insertion channel.

FIG. 9 is a view showing a state in which the flow path control valve closes the other treatment tool insertion channel.

FIG. 10 is a view showing a state in which the flow path control valve opens both of the two treatment instrument insertion channels in the different embodiment of the present invention.

FIG. 11 is a view showing a state in which the flow path control valve closes one treatment tool insertion channel in a different embodiment of the present invention.

FIG. 12 is a view showing a state in which the flow path control valve closes the other treatment tool insertion channel in the different embodiment of the present invention.

[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 23 Suction channel 24 suction cylinder 25 suction nipples 26 Suction button 27 Suction pump (suction source) 30 channel connection member 31A 31B Hollow conduit (treatment instrument insertion channel) 32A 32B Relay tube 41A 41B Radial communication passage 50 Suction channel switching dial 51 valve member 52 knob 53 Mounting ring 55 Flow path switching valve 61 click recess 69 click convex 70 Rotational position index 80A 80B Suction force adjustment recess (suction force adjustment flow path) 81A 81B Suction force adjustment recess (suction force adjustment flow path)

Claims (4)

[Claims] 1. A suction source; a communication space communicating with the suction source; a pair of treatment instrument insertion channels communicating with the communication space; and a suction source located in the communication space, the pair of treatment instrument passages being inserted through the suction source. A flow path switching valve capable of switching operation to two one-side communication states in which one of the channels is switched and communicated;
In a suction switching mechanism for an endoscope including: one of the treatment instrument communication channels communicating with a suction source when the flow path switching valve is in at least one of the two one-way communication states. And a suction force adjusting flow path for communicating the other treatment tool insertion channel different from the above with the suction source with a communication area smaller than the communication area between the one treatment tool insertion channel and the suction source. Suction switching mechanism for endoscopes. 2. The suction switching mechanism for an endoscope according to claim 1, wherein when the communication area between the one treatment instrument insertion channel and the suction source is 100, the small communication area is 5
The suction switching mechanism of the endoscope which is -10. 3. The suction switching mechanism for an endoscope according to claim 1, wherein the communication space has a cylindrical inner peripheral surface in which the pair of treatment instrument insertion channels open at different positions in the circumferential direction. The flow path switching valve has a cylindrical outer peripheral surface that is in sliding contact with the cylindrical inner peripheral surface of the communication space, and is rotatable along the inner peripheral surface of the communication space into the two one-way communication states. The suction switching mechanism for an endoscope, wherein the suction force adjusting flow path is composed of a recess formed in the inner peripheral surface of the communication space or the outer peripheral surface of the flow path switching valve. 4. The suction switching mechanism for an endoscope according to claim 1, wherein the flow path switching valve causes the suction source to communicate with both of the pair of treatment instrument insertion channels. A suction switching mechanism for endoscopes that can switch to both communicating states.