JP2558172Y2 - Endoscope air supply device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope air supply device.

[0002]

2. Description of the Related Art Generally, an air supply device for an endoscope is connected to a bottom end of a cylinder by connecting a base end side of an air supply pipe inserted into the insertion portion to eject air from a distal end of the insertion portion. A piston for performing a pneumatic operation is detachably inserted into the cylinder.

[0003] A check valve for preventing backflow of air from the distal end side of the insertion portion to the cylinder side and a cap for closing the inner end opening of the piston are provided detachably with respect to the piston. .

[0004]

[Problems to be Solved by the Invention] In order to prevent infection through the endoscope, after the endoscope is used, not only the outer surface of the endoscope but also a piston and the like for performing an air supply operation. It needs to be thoroughly washed.

Therefore, in the conventional endoscope having the above-described air supply device, the piston is removed from the cylinder after use, and the check valve and the cap are removed from the piston to clean them and the piston. .

However, removing the very small check valve and the cap from the piston is very troublesome, and there is a disadvantage that the removed check valve is often lost.

Accordingly, the present invention provides an endoscope air supply device in which the check valve and the cap can be easily removed from the piston when cleaning the piston, and the removed check valve is less likely to be lost. Aim.

[0008]

In order to achieve the above-mentioned object, an air supply device for an endoscope according to the present invention includes an air supply pipe inserted into the insertion portion to blow air from a distal end of the insertion portion. The bottom end of the cylinder is connected to the bottom of the cylinder, and a piston for performing an air supply operation is removably inserted into the cylinder, and the flow of air from the cylinder side to the air supply line side is prevented. The endoscope is provided with a check valve for preventing backflow of air from the air supply pipe side to the cylinder side and a cap for closing the inner end opening of the piston, which is detachably provided to the piston. In the air device,
The check valve and the cap are integrally formed of an elastic material.

[0009]

An embodiment will be described with reference to the drawings. In FIG. 2, reference numeral 2 denotes an operation unit of the endoscope, and the insertion unit 3 and the flexible connection tube 4 are connected. A connector 6 connected to the light source device 5 is provided at the tip of the flexible connection tube 4.

Reference numeral 8 denotes a water storage tank, the inside of which is pressurized by an air supply pump 9 provided in the light source device 5. Air and water are sent out from the air guide pipe 11 and the water guide pipe 12 by the pressurized pressure. .

The operation unit 2 is provided with a switching valve device 20 for performing an air / water supply operation. An air supply line 21 and a water supply line 22 for supplying air and water to the switching valve device 20 are provided. Is connected to the switching valve device 20 and is passed through the flexible connecting pipe 4. Then, the air supply line 21 and the water supply line 22
At the end of the connector 6, the air guide pipe 11 and the water guide pipe 12
And are detachably connected.

Further, an air supply pipe 2 passed through the insertion portion 3 to eject air and water from the opening at the tip of the insertion portion 3.
3 and the water supply line 24 are connected to the switching valve device 20. FIG. 1 shows the switching valve device 20, showing different states in the left half and the right half.

The cylinder 30 fixed to the operating portion 2 by the fixing nut 28 so as to open outward is formed so that the inner diameter becomes smaller in four steps toward the bottom. Are formed on the slope. 29 is an O-ring for sealing.

The water supply line 22, the water supply line 24, and the air supply line 2 are arranged on the slope of the cylinder 30 in this order from the mouth side.
1 is connected, and the air supply duct 23 is connected to the bottom of the cylinder 30.

When the cleaning brush is inserted from the openings of the conduits 21 to 24 into the opening at the tip of the insertion portion 3 and the opening on the connector 6 side, all the openings of the conduits 21 to 24 are closed by the cylinder 30. This is to make it possible to visually insert the brush inside. The pipes 21 to 24 connect the tubes 21a to 24a forming the pipes to the cylinder 30 via metal pipes 21b to 24b.

A piston 32 whose outer diameter is changed in four steps according to the inner diameter of the cylinder 30 is slidably fitted in the cylinder 30, and a seal O is provided on the sliding surface with the cylinder 30. A ring is attached.

A through hole 34 is formed in the piston 32 at the center axis position.
Holes and grooves 36, 37, 38, 39, 4 for ventilation or water passage
0 is formed. The ventilation hole 36 communicates with the internal through hole 34.

At the inner end of the piston 32, an elastic rubber check valve cap 42 is detachably attached so as to close the end opening of the through hole 34. As shown in FIG. 3, the check valve-equipped cap 42
A cap 42a for closing an end opening of the through hole 34 and a thin check valve 42b are integrally formed. A flange 42c protruding inward is formed in a constricted portion at the inner end of the piston 32. It is fixed to the piston 32 by being hooked.

The check valve 42b is a V-shaped annular body whose cross section is inwardly convex, and as shown in FIG.
The wall of the piston 32 located inside the
The check valve 42b covers the periphery of the vent 44.

Reference numeral 46 denotes an operation button operated by a fingertip.
It is screwed into the head of the piston 32. A leak hole 47 formed in the operation button 46 communicates coaxially with the through hole 34 of the piston 32.

In order to prevent the piston 32 from falling out of the cylinder 30 by a certain amount or more, a stopper tube 48 is detachably screwed and attached to the outer edge of the cylinder 30. A compression coil spring 49 is interposed between the compression coil spring 49 and the compression coil spring 49.

Therefore, the piston 32 and the operation button 46 are urged outward so as to protrude from the cylinder 30. In the standby state, the large-diameter portion end face 3 of the piston 32
2b is stationary at a position where it comes into contact with the flange portion 48a of the stopper tube 48.

In the normal standby state shown on the left half side of FIG. 1, the air supply device for the endoscope thus configured has a piston 32 between the water supply line 22 and the water supply line 24.
The space between the air supply line 21 and the air supply line 23 is not closed by the piston 32.

However, since the pipe resistance of the leak hole 47 and the through-hole 34 is extremely small as compared with the rubber elasticity of the check valve 42b, all the air sent from the air supply pipe 21 into the air supply cylinder 31 is not changed. The air is discharged from the leak hole 47 to the atmosphere, the communication hole 37 is closed by the check valve 42b, and no air is sent into the air supply duct 23.

If the air pressure in the body cavity into which the insertion portion 3 is inserted is high and air tries to flow backward from the air supply line 23 toward the cylinder 30, the air flow is controlled by the check valve 42 b. Will be blocked.

When the leak hole 47 of the operation button 46 is closed with a fingertip, the air released from the leak hole 47 to the atmosphere has no place to go and the air pressure in the through hole 34 rises. Air is sent out to the air supply duct 23 and is sent to the tip of the insertion portion 3. At this time, FIG.
As shown in the left half of the figure, the check valve 42b is elastically deformed and opened by the pressure difference between the inside and outside of the valve.

When the operation button 46 is pushed in while the leak hole 47 is closed with a fingertip, as shown in the right half of FIG.
2a is pressed against the bottom tapered surface of the cylinder 30,
The inlet of the air supply duct 23 is completely closed.

Therefore, the air in the air supply line 21 has no escape place completely, and high pressure is applied to the water in the water storage tank 8. Further, the water supply pipe 22 and the water supply pipe 24 communicate with each other through water flow grooves 39 and 40 formed on the outer periphery of the piston 32.

Therefore, the water pushed out from the water storage tank 8 by air pressure is sent out from the water supply line 22 into the water supply line 24, and is sent to the tip of the insertion portion 3. When the endoscope inspection is completed, the piston 32 can be pulled out of the cylinder 30 by loosening and removing the stopper tube 48 from the cylinder 30.

When cleaning the through hole 34 and the vent hole 44 of the piston 32, the cap 42 with a check valve can be elastically deformed and removed from the piston 32. The valve 42b is always integrated even during such attaching / detaching work and in a state where it is detached from the piston 32.

The present invention is not limited to the above embodiment. For example, as shown in FIG. 4, a cylindrical cylinder 30 whose inner diameter does not change in the middle is used, and With the connection positions different, a water supply pipe 24 heading toward the insertion section 3 is provided at the opening of the cylinder 30 and an air supply pipe 23 is provided at the bottom of the cylinder 30. You may apply to various things, such as the switching valve apparatus made easy.

[0032]

According to the air supply device for an endoscope of the present invention, the check valve and the cap that are attached to and detached from the piston are integrally formed, so that the check valve and the cap are separated from the piston when cleaning the piston. It has an excellent effect that the check valve can be easily removed as a single unit, and there is almost no risk of losing the removed check valve.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a switching valve device according to an embodiment of the present invention.

FIG. 2 is an overall schematic diagram of the air / water supply device of the endoscope according to the embodiment of the present invention;

FIG. 3 is a half sectional view of the cap with a check valve according to the embodiment of the present invention;

FIG. 4 is a longitudinal sectional view of a switching valve device according to a second embodiment of the present invention.

[Explanation of symbols]

 3 Insertion Section 20 Switching Valve Device 21 Air Supply Line 23 Air Supply Line 30 Cylinder 32 Piston 42 Cap with Check Valve 42a Cap 42b Check Valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiki Ito 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Optical Industry Co., Ltd. (72) Shinichi Matsuno 2-36 Maenocho, Itabashi-ku, Tokyo 9 Asahi Optical Industry Co., Ltd.

Claims (1)

(57) [Scope of request for utility model registration] An air supply pipe inserted into the insertion section is connected to a bottom end of a cylinder to blow air from a tip of the insertion section, and a through hole for ventilation is formed in an axial direction.
A piston for performing an air supply operation is detachably fitted into the cylinder, and the flow of air from the cylinder side to the air supply line side is not blocked and the air flow from the air supply line side to the cylinder side. In an air supply device for an endoscope provided with a check valve for preventing a backflow of air going, an inner end opening of a through hole formed in the piston is closed.
And a check valve for the endoscope formed integrally with an elastic material and provided detachably with respect to the piston .