JPH0199526A - Suction controller for endoscope - Google Patents

Abstract

PURPOSE:To prevent the lowering in sucking capability and leakage of liquid without hindrance to a sliding tube with secured sealing by a method wherein, a sliding tube is provided freely slidably to an axial direction on the outer periphery of an inner tube, and when a sliding tube comes to the vicinity of both ends of a sliding section, a sealing while being abutted against each other is performed. CONSTITUTION:A sliding tube 16 is fit on an inner tube 13. On the lower end part of the sliding tube 16, a first sealing member 17 is provided, while a second sealing member 18 provided on the upper end part. In the state the sliding tube 16 is energized upward, the first sealing member 17 located on the lower end of the tube 16 is abutted against a protrusion 9 provided on the inner periphery surface of an outer tube 6. Accordingly, under this state, a sucking hole 11 communicates with ambient air through a void 14 and a second hole 24, and a sucking pump communicating with the sucking hole 11 sucks-in the ambient air. Since a sealing valve 43 and a valve seat 57 are in contacted state, a water never leaks to outside from said place even when the water is fed under high pressure from a forceps 27.

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 operation 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 to allow treatment instruments such as forceps to 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, in a conventional endoscope, a forceps port for inserting forceps into the operating section and a suction control device for performing a suction operation are separately provided.

As a result, the operation section becomes large and heavy, and the operability is poor.Moreover, both the forceps mouth and the suction control device must be cleaned, making maintenance management troublesome.

Therefore, as shown in Japanese Patent Application No. Sho 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 opening 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 connected to the forceps channel a, and this inner tube C faces the forceps channel a. Also,
On the outer periphery of the inner tube C, there is a slide tube d that is slidable in the axial direction.
is provided, and by moving this slide tube d in the axial direction, the forceps channel a and the suction source e are communicated with and cut off from each other.

However, this suction control device has an inner pipe C and a slide pipe d.
Since there is no sealing mechanism in the sliding part f between the When a syringe or the like is connected to the forceps port k to apply pressure in order to supply water, air and water may enter and exit from the sliding part f, reducing the suction ability or causing the water supply to leak. be. Furthermore, in order to eliminate the above-mentioned disadvantages, as shown in FIG. 6, a sealing material i such as an O-ring is interposed between the inner tube C and the slide tube d for sealing.

[Problems to be Solved by the Invention] However, as described above, when 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 seal Due to the resistance of the material, the slide tube does not slide smoothly, which hinders suction operation.
Also, if it is not sealed, a decrease in suction capacity 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 effects for solving the problem] This invention provides an inner tube within an outer tube that communicates with a suction source and connects one end to a forceps channel, and a slide tube that is slidable in the axial direction around the outer circumference of the inner tube. and by sliding this slide tube in the axial direction, a valve mechanism provided on the inner periphery of the outer tube and the outer periphery of the slide tube opens and closes, thereby controlling the opening and closing of the communication between the suction source and the forceps channel. The sealing means for the sliding portion of the tube and the slide tube consists of a seal valve provided on one of the inner tube and the slide tube and a valve seat provided on the other, and the seal means is provided near both ends of the sliding section of the slide tube. The seal valve and the valve seat are configured so that they come into contact with each other, and when the slide pipe is located near both ends of the sliding section, they come into contact and seal, thereby preventing the seal valve from rubbing while the slide pipe is sliding. be.

〔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 is provided with an eyepiece section 2, an angle knob 3, a suction control device 4, and
The insertion section 5 is connected. The distal end of the insertion portion 5 is formed into a curved portion 5a, and this 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.
is connected. Further, a protruding strip 9 is formed on the inner peripheral surface of one end of the outer tube 6, a suction hole 11 that communicates with a suction pump (not shown) is bored near the protruding strip 9, and the other end has a U-shaped cross section. A shaped 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 the inner tube 13 is formed into a skirt shape, and the forceps channel 8 inside the inner tube 13 communicates with the space 14 between the outer circumferential surface of the inner tube 13 and the inner circumferential surface of the outer tube 6. A first through hole 15 is bored.

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

One end of a tube 23 is connected to the flange 12 formed at the upper end of the outer tube 16 for a first attachment as a base.

For this attachment, an M2 through hole 24 is formed in the peripheral wall of the tube 23, and the end of the lever 22 protrudes from this second through hole 24. An operating knob 25 is provided at the protruding end of the lever 22.

Further, at the upper end of the inner tube 13, a second cap also serves as a base.
One end of the tube 26 is fitted onto the outside.

In the first and second attachments, a forceps plug 27 is provided at the other end of the tube 23.26. 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 has a short tubular shape, and the first groove 31 formed on the inner circumferential surface of one end of the main body 28 is fitted into the collar 23a formed at the upper end of the tube 23 for the first attachment. There is.

In addition, a thin film-like first
A valve portion 32 is provided. The first valve part 32 is closed at its lower end, and is formed into a cylindrical shape whose outer dimension is smaller than the inner diameter of the pipe 23, and whose lower end is normally closed in an airtight manner. A first slit 33 has been cut. Further, a tapered portion 34 is formed on the inner circumferential surface of the first valve portion 32 so that the inner diameter thereof gradually decreases toward the first slit 33 . The first valve portion 32 is inserted into the pipe 26 at the second attachment point.

The lid body 29 is connected to the main body 28 by a flexible connecting member 35, and a protrusion 36 formed at the lower end of the outer peripheral surface is connected to a second groove formed at the upper inner peripheral surface of the main body 28. The collar 3 is elastically fitted to the collar 3 and formed at the upper end.
8 is in contact with the upper end surface of the main body 28 and is detachably provided. A concave second valve portion 39 is formed on the lid body 29, and an inner diameter hole of the forceps plug 27 for inserting a treatment instrument (not shown) is provided on the lower side of the second valve portion 39. 4
2 is cut off. 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 part 39, and the maximum width of one end located on the upper surface side is the same as that of the insertion hole. The minimum width dimension located on the lower surface side is larger than the diameter of the insertion hole 41 and is the same as the inner diameter d of the insertion hole 41.

Note that the short tube 21 is fixed integrally with the slide tube 16.
A seal valve 43 made of an elastic body is provided on the upper inner circumferential surface, and a collar 44 is provided protruding from the lower inner circumferential surface. In addition, a second attachment integrally fixed to the inner pipe 13 has a recess 5 in the pipe 26 that forms a valve seat 57 on both sides of the seal valve 43.
8 is provided. The seal valve 43 and valve seat 57 are
The positional relationship is such that the slide tubes 16 come into contact when they have completely slid to both sides. Moreover, the above-mentioned collar 44 and the above-mentioned inner pipe 1
A spring 46 is provided between the stopper 45 and a stopper 45 which is externally fitted and fixed to the middle part of 3. Since the spring 46 causes the slide tube 16 to move as shown in FIG. Therefore, in that state, the suction hole 1
1 communicates with the outside air through 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, when the slide tube 16 is pushed in as shown in the left half of FIG. The contact between the sealing material 17 and the protruding strip 9 is removed. 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 15. The forceps channel 8 is adapted to act on the forceps channel 8 through the forceps channel 8. 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, the outside atmosphere is sucked in from here, and the suction force against the body is reduced. There's nothing to do. In addition, the seal valve 43
Since the seal valve can also be used 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.

Further, the second attachment is to the pipe 26, and the first sealing material is the fourth sealing material 4 which maintains the seal between the tube 23.
7 is provided.

In the forceps plug 27 having such a structure, in order to insert a treatment tool such as forceps (not shown) into the forceps channel 8, the tip of the treatment tool must be pressed against the upper surface of the second valve portion 39 of the lid body 29. . Then, by pushing open the second slit 42 of the second valve part 39 of the lid body 29 and pushing open the first slit 33 of the first valve part 32 of the main body 28 through the insertion hole 41, the procedure is as follows. - A tool can be inserted into the forceps channel 8 from the inner tube 13. 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 portions 32, 39.

By the way, the minimum width of the second slit 42 of the second valve part 39 is the same as the inner diameter d of the insertion hole 41 of the lid 29, and the maximum width is the same as the inner diameter d of the insertion hole 41. It's big enough in comparison. The outer dimensions of the treatment instrument are smaller than the inner diameter of the insertion hole 41. Therefore, when the treatment instrument 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 one embodiment described above, and may be configured as shown in FIG. 4. That is, a valve seat 57a is provided at the upper end of the short pipe 21 fixed to the slide pipe 16, and this valve seat 57
The second mounting opposite to a is provided with a seal valve 43 on the pipe 26. Then, 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 at the position where the slide tube 16 is completely slid downward, the first sealing material 17 is attached to the valve seat 57b.
b. Further, in this embodiment', the upper end of the biasing spring 46 contacts an upper stopper 55 provided on the short tube 21, and the lower end contacts a lower stopper 56 having a through hole 56a fixed inside the outer tube 6. It is in contact.

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 the drawing]

Figures 1 to 3 show an embodiment of this invention.
Fig. 1 is a vertical side view of the suction control device, Fig. 2 is a front view of the entire endoscope, Fig. 3 is a plan view of the forceps plug, and Fig. 4 is a suction control device showing another embodiment of the present invention. Longitudinal side view of, No. 5
6 and 6 are longitudinal sectional side views of a conventional suction control device. 6... Outer tube, 8... Forceps channel, 13... Inner tube, 16... Slide tube, 43... Seal valve, 57
···valve seat. Applicant's agent Patent attorney Atsushi Tsuboi Figure 1 Figure 2

Claims (1)

[Claims] an outer tube communicating with a suction source and having one end connected to the forceps channel; an inner tube fixed within the outer tube facing the forceps channel; and an inner tube fitted into the outer circumference 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, wherein the seal valve and the valve seat are in contact with each other near both ends of a sliding section.