JPH02119832A - Suction device for endoscope - Google Patents

Abstract

PURPOSE:To prevent generation of a burr and/or return in a cylinder internal surface sliding a piston by forming a device in a structure having two cylinders and slidably providing the piston, for connecting an upper stream side tube to or disconnecting it from a downstream side tube in a suction pipe line, in the second cylinder. CONSTITUTION:In a condition with a device not in operation, because the first tube 9 is disconnected from the second tube 10 by a piston 23, the atmospheric air is sucked by suction force, acting in the second tube 10, through a leak passage 24 of the piston 23. Accordingly, filth or the like in the body cavity is prevented from being sucked. For sucking the filth or the like in the body cavity to be removed, the leak path 24 is closed by finger pressing in a piston 23. Then the first tube 9 communicates with the second tube 10 through a communication hole 25 of the piston 23, so that suction force acts in the first tube 9 through the second tube 10, sucking the filth or the like in the body cavity to be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suction device for an endoscope that is operated to suction and remove mucus, dirt, blood, etc. from a body cavity.

(Prior Art) Generally, some endoscopes are provided with a suction line for suctioning and removing mucus, dirt, blood, and the like within a body cavity. This suction line usually consists of a first tube on the upstream side from the operating section of the endoscope to the distal end of the insertion section, and a second tube on the downstream side from the operating section to the connector connected to the end of the universal cord. The tube is divided into two tubes, and one end of each tube located inside the operating section is connected to a suction switching valve provided in the operating section. Suction can be performed by operating this suction switching valve.

The suction switching valve is formed of a cylinder and a piston slidably fitted in the cylinder in an airtight manner. A lateral hole is bored in the peripheral wall of the cylinder, and one end portions of two tubes forming the suction conduit are connected to the lateral hole. By operating the piston, the first tube and the second tube of the suction conduit can be brought into communication with each other or disconnected from each other.

(Problems to be Solved by the Invention) By the way, if a horizontal hole is drilled in the peripheral wall of the cylinder as described above in order to connect the tube of the suction conduit to the cylinder, burrs or burrs may occur at the mouth of the horizontal hole. is unavoidable. Since the cylinder of the suction switching valve has a fairly small diameter, it is not possible to effectively remove the burrs and burrs that have formed at the mouth of the horizontal hole on the inner circumferential surface of the cylinder.

If the piston and burrs are not completely removed, the piston and cylinder will be damaged during the piston pushing operation. Furthermore, since the inner surface of the cylinder is easily damaged when removing burrs and burrs, the airtightness may be impaired by the scratches.

Furthermore, in order to improve the airtightness between the cylinder and the piston, if a backing such as an O-ring is provided around the outer periphery of the piston, when the backing passes through the side hole when pushing the piston or attaching/detaching the piston, There was also the fact that the backing was easily damaged.

This invention was made based on the above-mentioned circumstances, and its purpose is to provide an inner wall that eliminates the need to drill a side hole for connecting a suction pipe in the peripheral wall on which the piston of the cylinder slides. An object of the present invention is to provide a suction device for an endoscope.

(Means and operations for solving the problems) In order to eliminate the above-mentioned problems, the present invention provides a first cylinder having an internal space that opens toward the outside of the endoscope; a second cylinder having an inner diameter smaller than the inner diameter and detachably fitting into the inner surface of the inner space of the first cylinder to separately form an airtight chamber in the inner space; A hollow piston that is slidably fitted into the piston, either an upstream or downstream tube of the suction line that is constantly connected to the inside of the piston, and a tube that is connected to the airtight chamber. the other tube of the suction conduit, and a position that is bored on the outer periphery of the piston and is closed facing the second cylinder by sliding of the piston, and a position that is opened facing the airtight chamber. and a communicating hole that moves between the holes.

With such a configuration, the second part on which the piston slides
Since it is not necessary to open a lateral hole for connecting the suction pipe to the inner circumferential surface of the second cylinder, there will be no burrs or burrs on the inner circumferential surface of the second cylinder.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 in FIG. 1 is an endoscope. This endoscope 1 consists of an insertion section 2 and an operating section 3, and a universal cord 5 having a connector 4 at its end is connected to the operating section 3. Further, the insertion section 2 is provided with an observation optical system 6, and this observation optical system 6 is optically connected to an eyepiece section 7 provided on the operation section 3.

On the other hand, a suction channel 8 is formed in the endoscope 1 . This suction conduit 8 includes a first tube 9 on the upstream side from the insertion section 2 to the operation section 3, and a second tube 10 on the downstream side from the operation section 3 to the connector 4 via the universal cord 5. It is formed from. The first tube 9
One end is connected to a suction switching valve 11 provided in the operating section 3, and the other end is open to the distal end 2a of the insertion section 2.

Further, one end of the second tube 10 is connected to the suction switching valve 1.
1, and the other end communicates with a base 4a that is connected to a suction pump (not shown) provided on the connector 4.

The suction switching valve 11 is constructed as shown in FIGS. 2 and 3. That is, a mounting hole 12 is bored in the wall 3a of the operating section 3, and the first cylinder 1 is inserted into this mounting hole 12.
3 is inserted. This first cylinder 13 is connected to the wall 3
The operation part 3 has a bottomed cylindrical shape with one end that protrudes to the outside from a and is open, and a stepped part 14 that engages with the inner surface of the wall 3a is formed in the middle part of the outer peripheral wall, and the outer peripheral surface of the one end part A screw 15 is formed in the. The first cylinder 13 is fixed to the wall 3a by an annular stopper 16 screwed onto the screw 15. The stopper 16 has an upper flange 16a and a lower flange 16b having a larger diameter than the upper flange 16a, and has a rectangular cross section.
A lower flange 16b is joined to the outer surface of the wall 3a.

Further, at the bottom of the first cylinder 13, a first connecting pipe 17 is provided at a position offset from the center in the radial direction, and a second connecting pipe 18 is provided at the center in the radial direction. This second connecting pipe 18 consists of a large diameter part 18a and a small diameter part 18b, and an abutment step part 19 is formed at the boundary between these parts. and,
One end of the first tube 9 is connected to the first connecting pipe 17, and one end of the second tube 10 is connected to the small diameter portion 18b of the second connecting pipe 18. That is, one end of the first and second sub-tubes 9 and 10 is connected to the first cylinder 1.
It is connected to open at the bottom of 3. Further, a second cylinder 20 is fitted into the first cylinder 13. The second cylinder 20 has its outer circumferential surface hermetically joined to the inner circumferential surface of the first cylinder 13, thereby forming an airtight chamber 13a in the internal space of the first cylinder 13. A flange 21 having approximately the same diameter as the upper flange 16a of the stopper body 16 is formed at the upper end portion protruding from the cylinder 13, and an insertion hole 22 penetrating in the axial direction is bored in the center portion. A piston 23 is fitted into the insertion hole 22 so as to be vertically movable. A leak passage 24 extending over the entire axial length is bored in this piston 23,
A communication hole 25 communicating with the leak path 24 is provided in the middle of the peripheral wall. Further, the piston 23 has a concave portion 26 having a rectangular cross-section formed at one end projecting outward from the second cylinder 20 . The piston 23 is elastically held by a biasing member 27 made of an elastic material such as synthetic resin or rubber so that one end thereof protrudes from the second cylinder 20, as shown in FIG. That is, the biasing member 27 has a substantially skirt-like shape with open upper and lower surfaces, and has an annular flange 28 projecting radially inward at the upper end.
is formed, and a first annular groove 29 and a second annular groove are formed on the inner circumferential surface of the lower end.
An annular groove 30 is formed. And the biasing member 2
7 is the first. The second annular grooves 29 and 30 are removably fitted into the upper flange 16a of the stopper 16 and the flange 21 of the second cylinder 20, and the annular collar 28 is fitted into the recess 26 of the piston 23. Piston 2
It is provided so as to cover the outer peripheral surface of 3. therefore,
By removing the first annular groove 29 of the biasing member 27 from the upper flange 16a of the stopper 16, the piston 23 and the second cylinder 20 can be removed from the first cylinder 13 together with the biasing member 27. It looks like this.

Note that when the piston 23 is held by the biasing member 27 as shown in FIG. 2, the communication hole 25 formed in the piston 23 is located within the insertion hole 22 of the second cylinder 20 and is closed. At the same time, since the lower end portion is fitted into the second connecting tube 18, the first tube 9 and the second tube 10 are disconnected from each other. Further, as shown in FIG. 3, when the piston 23 is pushed against the restoring force of the biasing member 27 until its lower end surface abuts the abutment step 19 formed on the second connecting pipe 18, the above-mentioned Since the communication hole 25 is exposed and opened from the insertion hole 22 of the second cylinder 20,
The first tube 9 and the second tube 10 communicate with each other through the communication hole 25.

In the endoscope having such a configuration, the base 4 of the connector 4
When a suction pump (not shown) connected to a is activated, the first tube 9 and the second tube 10 are connected to each other when the suction switching valve 11 is not operated as shown in FIG.
Since the air is blocked by the piston 23, the suction force acting on the second tube 10 causes atmospheric air to be sucked in through the leak path 24 of the piston 23. therefore,
The dirt inside the body cavity will not be sucked out. To suction and remove dirt from the body cavity, as shown in FIG. 3, the leak passage 24 is closed with a finger and the piston 23 is pushed in. Then, the first tube 9 and the second tube 10 communicate with each other through the communication hole 25 of the piston 23, so that the suction force increases to the second tube.
This acts on the first tube 9 through the tube 10 to suction and remove dirt and the like in the body cavity.

The endoscope 1 used in this way has its suction pipe 8
Since the suction pipe 8 becomes contaminated with dirt and the like, the suction pipe 8 must be cleaned after use. In that case, the fourth
A cleaning device 31 as shown in the figure is used. This cleaning device 3
1 consists of a brush 32 and a cover 33 molded from a transparent elastic material such as flexible synthetic resin or rubber.

That is, the brush 32 is formed by providing an upper part 35 by providing brush bristles of a predetermined length at the tips of twisted wires 34.

The cover 33 has a cap shape with an open bottom, and the upper flange 1 of the stopper 16 is provided on the inner peripheral surface of the lower end.
6a is formed with a mounting groove 36 that is removably fitted, and a through hole 37 is bored at the top, through which the wire 34 of the brush 32 is inserted in an almost airtight state. . The height of the cover 33 is such that when the cover 33 is attached to the stopper 16, the height of the space formed by the cover 33 and the first cylinder 13 is the same as that of the upper part 35 of the brush 32. It is set to be longer than the length dimension.

Cleaning of the suction pipe line 8 using such a cleaning device 31 is performed as follows. First, after a sufficient amount of disinfectant is suctioned into the suction line 8 by a normal suction operation, air is sucked to drain the suction line 8, and then the suction pump is stopped. Next, the piston 2 together with the biasing member 27
3 and the second cylinder 20 from the first cylinder 13, the cover 33 with the brush 32 inserted therein is inserted into the opening of the first cylinder 13, that is, the flange 16a on the upper part of the stopper 16 in the mounting groove 36. Fit and install.

Once the cover 33 is attached, the cover 33 is transparent, so while looking inside, first insert the brush 32 from the first connecting tube 17 to the first tube 9 side, and insert the upper part 35 into the tip of the insertion section 2. After protruding from the surface 2a, place the tip of the insertion section 2 into the disinfectant solution. Here, operate the suction pump again, pull the brush 32 while sucking the disinfectant, and
Disinfect the tube 9 by brushing it.

At this time, the cover 33 is attached to the first cylinder 13, and the wire 34 of the brush 32 and the cover 33 are attached to the first cylinder 13.
Since the through hole 37 of No. 3 is almost airtight, disinfectant, dirt, etc. will not be scattered outside. Then, the user brushes the inside of the first tube 9 while observing the color of the disinfectant flowing inside the first cylinder 13 through the transparent cover 33.

After brushing the inside of the first tube 9 in this way, insert the upper part 35 of the brush 32 into the first tube 9.
and put it into the second tube 10. At this time, since the length of the upper part 35 of the brush 32 is shorter than the height of the space formed by the first cylinder 13 and the cover 33, the upper part 35 of the brush 32 can be moved to the first cylinder without removing the cover 33. can be transferred from the first tube 9 to the second tube 10, which is hygienic. If the brush 32 is passed through the second tube 10 in this way, this second tube 10
As with the first tube 9, brush the tube while flowing the disinfectant. When brushing the second tube 10, if the base 4a of the connector 4 and the suction pump are connected with a transparent hose, when the brush 32 is passed through the second tube 10, the upper part 35 of the brush 32 will be removed from the base 4a. It is possible to check whether it has protruded or not, and also to check the color of the disinfectant flowing through the second tube 10.

That is, according to the suction switching valve 11 configured as described above, one end of the first and second tubes 9 and 10 forming the upstream side and the downstream side of the suction pipe line 8 is opened at the bottom of the first cylinder 13. Therefore, when the brush 32 is inserted from the first cylinder 13 into each tube 9.10, the tip of the brush 32 can be inserted into the container without bending.

Note that when brushing the suction conduit 8 without using the cover 33, it is sufficient to stop the suction pump and perform only brushing without flowing the disinfectant.

Furthermore, since the piston 23 and the second cylinder 20 can be removed from the first cylinder 13, cleaning and disinfection of these sliding parts and the communication hole 25 formed in the piston 23 is easy and reliable. can be done.

By the way, in the suction switching valve 11, the suction pipe line 8
The first tube 9 and the second tube 10 forming the Since the configuration eliminates the need to drill a side hole for connecting the tubes 9 and 10, there will be no burrs or burrs on the inner surface of the second cylinder 20.Therefore, there is no need to remove burrs or burrs. Not only can this be omitted, but also damage to the piston 23 due to incomplete removal can be prevented.

In addition, by operating the piston 23, the suction pipe 8
In order to communicate the upstream tube 9 and the downstream tube 10 of the piston 23, a communication hole 25 (horizontal hole) must be formed in the piston 23, which prevents burrs or burrs from forming at the mouth of the communication hole 25. Inevitable. However, even if burrs or burrs occur at the mouth of the communication hole 25 formed in the piston 23, it is difficult to easily and reliably remove the burrs or burrs from the outer circumferential surface that makes sliding contact with the inner circumferential surface of the second cylinder 20. can. Therefore, the piston 23 has the communicating hole 2.
Even if holes 5 are drilled, there are various problems such as the burrs and burrs that are generated at that time are difficult to remove like the burrs and burrs that occur on the inner peripheral surface of the cylinder, and that they may damage the piston 23 and the second cylinder 20. I'm never invited.

FIG. 5 shows a second embodiment of the present invention, which differs from the first embodiment in the structure of the suction switching valve 11.

That is, the second embodiment shown in FIG.
The insertion hole 22 of the second cylinder 20, into which the cylinder 20 is inserted, is bored at an eccentric position of the second cylinder 20. Then, an annular flange 28 for holding the piston 23 formed on the biasing member 27 is made eccentric so as to correspond to the insertion hole 22, and a second connecting pipe is connected to one end of the second tube 10. 18 is also the above-mentioned piston 2 at the bottom of the first cylinder 13
3 and the corresponding eccentric position. Furthermore, a first connecting pipe 17 to which one end of the first tube 9 is connected was connected to the bottom of the first cylinder 13 at an angle with respect to the axis of the first cylinder 13 .

According to such a configuration, the first. Since there is no need to connect the second tube 9.10,
No burrs or burrs occur on the inner circumferential surface of the second cylinder 20.

Also, the second connecting pipe 18 is eccentrically connected to the first cylinder 1.
3, the first connection pipe 17 can be connected shifted in the direction of the center axis of the bottom of the first cylinder 13 compared to the first embodiment. The brush 32 can be easily inserted from the pipe 17 into the first tube 9, and the brush 32 can also be easily inserted because the first connecting pipe 17 is inclined.

(Effects of the Invention) As described above, the suction device of the present invention has a structure having two cylinders, a first cylinder and a second cylinder, and the second cylinder is connected to the upstream tube of the suction conduit. A piston is slidably provided to communicate with or disconnect from the downstream tube.

Therefore, it is possible to provide a configuration in which the tubes of the suction conduit do not need to be connected to the second cylinder on which the piston slides. In other words, since there is no need to drill side holes to connect each tube to the second cylinder, it is unnecessary to create burrs and burrs on the inner surface of the cylinder where the piston slides, which requires a lot of effort to remove. It is possible to prevent the piston and the cylinder from being damaged during the piston pushing operation due to incomplete removal.

Furthermore, since the second cylinder and piston can be removed from the first cylinder, there is an advantage that they can be easily cleaned and disinfected.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a schematic configuration diagram of an endoscope, FIG. 2 is a sectional view of a suction switching valve, and FIG. 3 is also in a suction state. FIG. 4 is an explanatory view when cleaning the suction pipe line, and FIG. 5 is a cross-sectional view of a suction switching valve showing a second embodiment of the present invention. 8... Suction pipe line, 9... First tube (upstream side)
, 10... Second tube (downstream side), 13... First cylinder, 13a... Airtight chamber, 20... Second cylinder, 23... Piston, 25... Communication Hole. Applicant's agent Patent attorney Jun Tsuboi Figure 5

Claims (1)

[Claims] a first cylinder having an internal space opened toward the outside of the endoscope; and a first cylinder having an inner diameter smaller than the inner diameter of the first cylinder and removably fitting into the inner surface of the inner space of the first cylinder. a second cylinder that separately forms an airtight chamber in the inner space; a hollow piston that is slidably fitted in the second cylinder in an airtight manner; and a suction that is constantly communicated with the inside of the piston. Either one of the tubes on the upstream side or the downstream side of the conduit, the other tube of the suction conduit connected to the airtight chamber, and the tube that is bored on the outer periphery of the piston, and the sliding of the piston causes the above-mentioned A suction device for an endoscope, comprising a communication hole that moves between a closed position facing the second cylinder and an open position facing the airtight chamber.