JPH0439851B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a suction control device for an endoscope, which is provided in an operating section of an insertion section and controls opening and closing of communication between a suction source and a forceps channel.

[Conventional technology]

In an endoscope that is equipped with a forceps channel extending from the operation section to the insertion section, so that treatment instruments such as forceps can be introduced into the body cavity, the forceps channel is used as a suction path to aspirate body fluids within the body cavity. There is something that can be done. However, conventional endoscopes
A forceps port for inserting forceps and a suction control device for performing a suction operation are separately provided in the operation section. As a result, the operation section becomes large and heavy, and the operability is poor, and both the forceps mouth and the suction control device must be cleaned, making maintenance management troublesome.

Therefore, as shown in Japanese Patent Application No. 61-190924, the present applicant has filed an application in which the operating section is provided with a main body that communicates with a suction source, and this main body is integrally provided with a forceps port that communicates with a forceps channel. has been done. However, as shown in FIG. 5, an inner tube c is provided inside an outer tube b connected to the forceps channel a, and this inner tube c faces the forceps channel a. Furthermore, a slide tube d that is slidable in the axial direction is provided on the outer periphery of the inner tube c, and by sliding the slide tube d in the axial direction, the forceps channel a and the suction source e are communicated with and shut off. I'm letting you do it. However, since this suction control device is not provided with a sealing mechanism at the sliding part f between the inner tube c and the slide tube d, a pressure difference occurs between the inside of the inner tube c and the outside of the suction control device. In other words, when a syringe h or the like is connected to the forceps port g to apply pressure during a suction operation or to send water through the forceps channel a,
There are disadvantages in that air and water enter and exit from the sliding portion f, reducing the suction ability and causing water leakage. In addition, in order to eliminate the above-mentioned inconvenience, as shown in FIG.
A sealing material i such as an O-ring is interposed between the two for sealing.

[Problem that the invention seeks to solve]

However, as mentioned above, if a sealing material is provided to prevent water leakage from the sliding portion f between the inner tube c and the slide tube d, the resistance of the sealing material will prevent the slide tube from sliding. This does not occur smoothly, which hinders the suction operation, and if it is not sealed, the suction capacity will be reduced and water leakage during water supply will be inevitable.

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide an endoscope that can securely seal without interfering with the sliding of the slide tube, and that can prevent a decrease in suction ability and liquid leakage. An object of the present invention is to provide a suction control device.

[Means and actions to solve the problem]

In this invention, an inner tube is provided within an outer tube that communicates with a suction source and one end is connected to a forceps channel, a slide tube that is slidable in the axial direction is provided on the outer periphery of the inner tube, and the slide tube is slidable in the axial direction. By moving the
In the valve mechanism provided on the inner periphery of the outer tube and the outer periphery of the slide tube to control opening and closing of communication between the suction source and the forceps channel, the sealing means of the sliding portion between the inner tube and the slide tube is connected to the inner periphery of the slide tube. It consists of a seal valve provided on one side of the tube and a slide tube, and a valve seat provided on the other.The seal valve and the valve seat are in contact with each other near both ends of the sliding section of the slide tube, and the slide tube is When located near both ends of the moving section, they abut and seal, preventing the seal valve from rubbing while the slide tube is sliding.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 2 shows an endoscope, which is equipped with an operating section 1. As shown in FIG. This operation section 1
Includes an eyepiece 2, an angle knob 3, and a suction control device 4.
are provided, and the insertion portion 5 is connected thereto. The distal end of the insertion portion 5 is formed into a curved portion 5a, and the curved portion 5a can be bent by the angle knob 3.

The suction control device 4 has an outer tube 6 as shown in FIG. This outer tube 6 is provided in the operating section 1, and one end protruding into the operating section 1 is connected to a forceps channel 8 via a connecting tube 7. Also,
A protruding strip 9 is formed on the inner peripheral surface of one end of the outer tube 6, a suction hole 11 communicating with a suction pump (not shown) is bored near the protruding strip 9, and a U-shaped cross section is provided at the other end. A flange 12 is formed.

An inner tube 13 is provided within the outer tube 6 with its lower end joined to the tapered portion 7a of the connecting tube 7.
The lower end of this inner tube 13 is formed into a skirt shape,
There, there is a forceps channel 8 inside the inner tube 13.
A first through hole 15 is bored through which the space 14 between the outer circumferential surface of the inner tube 13 and the inner circumferential surface of the outer tube 6 communicate with each other.

A slide tube 16 is slidably fitted onto the inner tube 13. The first slide tube 16
A first sealing material 17 is provided at the lower end in the figure, and a second sealing material 18 is provided at the upper end. Further, the slide tube 16 is formed with a large diameter portion 19 from the middle portion to the upper end side, and a short tube 21 is formed at this upper end.
is connected, and this short pipe 21 and the large diameter part 1
A lever 22 is held and fixed by the upper end surface of 9.

A flange 12 formed at the upper end of the outer tube 16
One end of the first attachment pipe 23 is connected to the base as a base. A second through hole 24 is formed in the peripheral wall of the attachment tube 23, and the end of the lever 22 projects from the second through hole 24. Lever 2
An operation knob 25 is provided at the protruding end of the 2.
Further, one end portion of a second attachment tube 26, which also serves as a base, is fitted onto the upper end of the inner tube 13. Then, the first and second attachment pipes 23, 2
A forceps plug 27 is attached to the other end of 6. This forceps stopper 27 consists of a main body 28 and a lid 29 made of an elastic material such as rubber. That is, the main body 28
is in the shape of a short tube, and a first groove 31 formed on the inner circumferential surface of one end thereof is fitted into a collar 23a formed at the upper end of the first attachment tube 23. Further, a first valve portion 32 in the form of a thin film is provided in the middle of the main body 28 in the axial direction. The first valve part 32 has a closed lower end and is formed into a cylindrical shape with an outer dimension smaller than the inner diameter of the second attachment pipe 23, and has a valve at its lower end that is normally closed in an airtight state. 1 slit 33 is cut. Further, a tapered portion 34 is formed on the inner circumferential surface of the first valve portion 32 so that the inner diameter gradually decreases toward the first slit 33. The first valve portion 32 is connected to the second attachment pipe 2.
It is inserted in 6.

The lid body 29 is connected to the main body 28 by a flexible connecting member 35, and a protrusion 36 formed on the lower end of the outer peripheral surface is connected to a second protrusion 36 formed on the upper inner peripheral surface of the main body 28. The main body 28 is elastically fitted into the groove 37 of the main body 28, and a flange 38 formed at the upper end is brought into contact with the upper end surface of the main body 28, so that the main body 28 can be freely attached and detached. A concave second valve portion 39 is formed on the lid body 39, and the inner diameter of a forceps plug 27 for inserting a treatment tool (not shown) is formed on the lower side of the second valve portion 39. An insertion hole 41 is formed. A second slit 42, which is normally closed airtight, is cut in the second valve portion 39. This second slit 42 is formed in a tapered shape whose width decreases from the upper surface side to the lower surface side of the second valve portion 39, and the maximum width dimension D of one end located on the upper surface side is the same as that of the insertion hole 42. The minimum width dimension located on the lower surface side is the same as the inner diameter d of the insertion hole 41.

A seal valve 43 made of an elastic body is provided on the upper inner circumferential surface of the short tube 21 which is integrally fixed to the slide tube 16, and a collar 44 is provided protruding from the lower inner circumferential surface. The second attachment pipe 26, which is integrally fixed to the inner pipe 13, is provided with a recess 58 that forms a valve seat 57 on both sides of the seal valve 43. The seal valve 43 and the valve seat 57 are in a positional relationship such that they come into contact when the slide tube 16 is fully slid on both sides. Also, a stopper 45 is externally fitted and fixed to the collar 44 and the middle part of the inner tube 13.
A spring 46 is provided between the two. and,
This spring 46 urges the slide tube 16 in the upward direction as shown in the right half of FIG. When the slide tube 16 is biased in the upward direction, the first sealing material 17 provided at the lower end thereof is in contact with the protrusion 9 provided on the inner circumferential surface of the outer tube 16 . Therefore, in this state, the suction hole 11 communicates with the outside air via the space 14 and the second through hole 24, so the suction pump communicating with the suction hole 11 sucks outside air as indicated by the arrow in the figure. . At this time, since the seal valve 43 and the valve seat 57 are in contact with each other to form a seal between the inner tube 13 and the slide tube 16, even if water is supplied at a higher pressure than the forceps plug 27, leakage will not occur from here to the outside. Never. Furthermore, if the slide tube 16 is pushed in using the lever 22 as shown in the left half of FIG.
The first sealing material 18 comes into contact with the opening edge of the outer tube 6, and the first sealing material 17 and the protruding strip 9 come out of contact with each other. As a result, the communication state between the second through hole 24 and the space 14 is cut off, and the space 14 and the forceps channel 8 are communicated with each other, so that the suction force of the suction pump is transferred between the space 14 and the first through hole. It is adapted to act on the forceps channel 8 via 15. At this time, since the seal valve 43 and the valve seat 57 are in contact with each other to form a seal between the inner tube 13 and the slide tube 16, outside air is sucked in from here, reducing the suction force against the body. Never. Also,
Since the seal valve 43 can also serve as a seal valve at both sliding ends of the slide tube, the number of parts is reduced, and the structure is simple and inexpensive.

Furthermore, a fourth sealing material 47 is provided on the second attachment tube 26 to maintain airtightness between the second attachment tube 26 and the first attachment tube 23 .

In the forceps plug 27 having such a structure, in order to insert a treatment instrument such as forceps (not shown) into the forceps channel 8, the tip of the treatment instrument is pressed against the upper surface of the second valve portion 39 of the lid body 29. . And the lid body 29
By pushing open the second slit 42 of the second valve part 39 of the main body 28 and pushing open the first slit 33 of the first valve part 32 of the main body 28 through the insertion hole 41, the treatment instrument can be removed from the inner tube 13. Forceps channel 8
can be inserted into the Further, in order to remove the treatment instrument inserted through the forceps channel 8, it is sufficient to pull it out against the elastic force of the first and second valve sections 32 and 39.

By the way, the second slit 42 of the second valve portion 39 has a minimum width dimension that is equal to the insertion hole 4 of the lid body 29.
It is the same as the inner diameter dimension d of 1, and the maximum dimension D is the insertion hole 4.
It is sufficiently larger than the inner diameter dimension d of No. 1. and,
The outer dimensions of the treatment instrument used are smaller than the inner diameter dimensions of the insertion hole 41. Therefore, when the treatment tool is inserted into and removed from the forceps channel 8, the second slit 42 of the second valve part 39 is not forcibly pushed open, so that cracks occur in the second valve part 39. will be prevented.

Note that the sealing means for the sliding portion between the inner tube 13 and the slide tube 16 is not limited to the above-mentioned one embodiment, but is similar to the fourth embodiment.
It may be configured as shown in the figure. That is, a valve seat 57a is provided at the upper end of the short tube 21 fixed to the slide tube 16, and a seal valve 43 is provided on the second attachment tube 26 facing the valve seat 57a. At a position where the slide tube 16 has completely slid in the upward direction, the seal valve 43 and the valve seat 57a come into contact with each other. Further, a valve seat 57b is provided on the shoulder at the lower end of the inner tube 13, and the first sealing material 17 comes into contact with the valve seat 57b when the slide tube 16 is fully slid downward. . Further, in this embodiment, the biasing spring 46
is a through hole 5 whose upper end abuts an upper stopper 55 provided on the short tube 21 and whose lower end is fixed inside the outer tube 6.
6a is abutted against a lower stopper 56 having a diameter of 6a.

According to this embodiment, since the seal valve 43 does not protrude in the inner diameter direction, there are few irregularities between the seal valve 43 and the inner pipe 13, and there is an advantage that every corner can be easily cleaned during cleaning.

〔Effect of the invention〕

As explained above, according to the present invention, a seal can be ensured between the slide tube and the inner tube without interfering with the sliding movement of the slide tube, thereby preventing a decrease in suction capacity and liquid leakage during liquid feeding. The effect is that it can be resolved without sacrificing sexuality.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is a vertical side view of the suction control device, FIG. 2 is a front view of the entire endoscope, and FIG. 3 is a view of the forceps plug. A plan view, FIG. 4 is a longitudinal sectional side view of a suction control device showing another embodiment of the present invention, and FIGS. 5 and 6 are longitudinal sectional side views of a conventional suction control device. 6... Outer tube, 8... Forceps channel, 13...
Inner pipe, 16...Slide pipe, 43...Seal valve,
57...Benza.

Claims (1)

[Claims] 1. An outer tube that communicates with the suction source and has one end connected to the forceps channel, an inner tube that is fixed within the outer tube facing the forceps channel, and an inner tube that is fitted onto the outer periphery of the inner tube so as to be slidable in the axial direction. By sliding this slide tube in the axial direction, valve mechanisms provided on the inner periphery of the outer tube and the outer periphery of the slide tube are opened and closed, thereby controlling the opening and closing of communication between the suction source and the forceps channel. In the suction control device for an endoscope, the sealing means for the sliding portion between the inner tube and the slide tube includes a seal valve provided on one of the inner tube and the slide tube and a valve seat provided on the other. A suction control device for an endoscope, characterized in that the seal valve and the valve seat are in contact with each other near both ends of a sliding section of the tube.