JPH02172435A - Air feed control device for endoscope - Google Patents

Abstract

PURPOSE:To prevent fixing of a valve body to block the reverse flow of contaminated liquid by a method wherein the one side wall surface of the recessed groove of a piston is formed in the piston rotatably around an axis, and a resilient ring is mounted to a member with which the side wall surface is formed. CONSTITUTION:When lines 5, 6, 7, and 8 for feeding air and water and the interior of a cylinder 2 are washed, a cover cylinder 25 is unfastened from the head port of a cylinder 2 for removal, and a piston 9 is pulled out from the cylinder 2. In this case, since the cover cylinder 25 and the piston 9 are compressed through the force of a compression coil spring 11, the piston 9 is rotated around an axis togetherwith the cover cylinder 25. Meanwhile, since a rotary ring 21 is not rotated due to friction resistance between a first O-ring 14 and the inner wall of the cylinder 2, a valve body 20 in a recessed groove 18 and the rotary ring 21 are relatively rotated. The one side wall surface of the recessed groove 18 is formed with the side wall of the rotary ring 21, and as a result, fixing between the valve body 20 and the recessed groove 18 can be prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of an air supply operation device for an endoscope that performs an air supply operation in an endoscope.

[Prior Art] This type of air supply operation device for an endoscope releases the air supplied into the cylinder to the atmosphere from a leak hole drilled in a piston when on standby, and when air is being supplied, the air is discharged from the leak hole. By covering it with your fingertips, air is sent out to the air pipe connected to the cylinder.

However, with such a configuration, a small amount of air is sent into the air pipe even during standby.

There are inconveniences such as so-called spontaneous air supply occurring from the tip of the insertion portion, and the pressure within the patient's body cavity rising too much against the operator's wishes.

Therefore, conventionally, a thin umbrella-shaped flexible valve body that is attached to the outer periphery of the piston and comes into contact with the inner surface of the cylinder is provided in the air flow path between the leak hole and the air pipe.

During standby, this valve body blocks the flow of air to the air pipe,
During air supply, the leak hole was blocked and the pressure inside the cylinder rose, causing a valve body to open and air to be sent out from the air supply pipe (Japanese Patent Laid-Open No. 59-1182).
Publication No. 8).

However, in the above-mentioned method, the end of the thin-walled umbrella-shaped valve body was in contact with the inner wall of the cylinder, so when the piston was moved back and forth within the cylinder by water supply operation, etc., the thin-walled end of the valve body was in contact with the inner wall of the cylinder. However, the edge of the inlet of the air pipe that opens into the inner surface of the cylinder could be touched and damaged. If the end of the valve body is damaged, the leak hole and the air supply pipe will communicate even during standby, resulting in natural air supply. In addition, in such a situation, when the pressure inside the body cavity increases, the sewage inside the body cavity flows back and blows out from the leak hole, which is an inconvenient situation.

Therefore, the present applicant formed a concave groove in the outer peripheral wall of the piston facing the inlet of the air pipe formed in the side wall of the cylinder.
A communication hole is formed to communicate the bottom of the groove and the leak hole, and when the communication hole is on standby, the gap between the communication hole and the air pipe is closed, and when the leak hole is closed, the elasticity is opened by the air pressure inside the cylinder. An endoscope air supply operating device was devised and filed earlier (Utility Model Application No. 63-45599
issue).

With this improvement, during standby, it is now possible to reliably block the flow of air to the air supply pipe, preventing spontaneous air supply from occurring, and also to prevent the squirting of dirty liquid flowing back from within the body cavity.

[Problem B to be solved by the invention] However, in the above-mentioned Utility Application No. 63-45599, while it is possible to completely stop the sewage flowing back from inside the body cavity with the valve body provided in the groove. However, there was a drawback that the valve body was stuck to the piston due to the dirty liquid, making it impossible to supply air normally.

This invention eliminates such drawbacks of the prior art.

In addition to preventing the generation of natural air and the spouting of backflow sewage,
It is an object of the present invention to provide an air supply operating device for an endoscope that can prevent a valve body that prevents backflow of dirty liquid from sticking and can always supply normal air.

[Means for Solving the Problems] In order to achieve the above object, an endoscope air supply operating device of the present invention operates a cylinder and a piston inserted into the cylinder to operate an endoscope. an air supply pipe provided in the section and supplying air into the cylinder;

An air supply pipe that sends air from inside the cylinder to the tip of the insertion section of the endoscope is connected to the cylinder, and an elastic seal ring that seals the fitting part between the piston and the cylinder and a leak hole that communicates with the atmosphere are connected to the piston. During standby, the air supplied from the air supply pipe into the cylinder is released into the atmosphere through the leak hole, and when air is being supplied, the air in the cylinder is blocked by blocking the leak hole. An endoscope air supply operating device configured to feed air into the trachea, wherein an inlet of the air tube is formed in a side wall of the cylinder, and an annular groove is formed on the outer periphery of a piston facing the inlet. A communicating hole is formed to communicate the bottom of the groove with the leak hole, and a valve body made of an annular elastic body is inserted into the groove so as not to contact the inner wall of the cylinder. In the press-fitted one, one side wall surface of the groove is formed to be rotatable about an axis relative to the piston, and the elastic seal ring is installed on a member forming the side wall surface.

[Operation] During standby, the valve body installed in the groove on the outer circumference of the piston closes the communication hole, and all air that enters the cylinder from the air supply pipe is released into the atmosphere through the leak hole. .

Even if there is a backflow of dirty liquid or the like through the air pipe, when the pressure on the air pipe side increases, the valve body is strongly pressed against the wall surface of the concave groove by that pressure and closes the communication hole.

During air supply, when the leak valve is closed with a fingertip or the like, the air inside the cylinder is sent into the air supply pipe while deforming the valve body, and air is supplied.

Furthermore, when the piston is rotated around the axis, the member forming one side wall of the groove does not rotate due to the frictional resistance between the elastic seal ring and the inner wall of the cylinder. and the valve body in the groove can be rotated relative to each other to prevent the valve body from sticking to the groove, and if the valve body and groove are stuck, the sticking can be released. can.

[Example] Examples will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, in which the left half is in a stationary state (standby state and air supply state) in which the piston 9 is not pushed in, and the right half is in a static state in which the piston 9 is not pushed into the cylinder 2. state (water supply state).

In the figure, 1 is the operating unit main body, 2 is a cylinder fixed to the inside of the operating unit main body l by a nut 3, and 2a is the cylinder 2.
4 is an O-ring for sealing. An air supply pipe 5 for supplying air into the cylinder 2 is connected near the bottom of the side wall of the cylinder 2, and a water supply pipe 6 for supplying water is connected to the side wall of the cylinder 2.
is connected near the mouth. In addition, in the middle part of the side wall of the cylinder 2, there are lower inlets a, 8a for an air supply pipe 7 and a water supply pipe 8 that open to the outside at the end (not shown) of the insertion part of the endoscope.
is formed with an opening.

A piston 9 is fitted into the cylinder z so that it can move forward and backward. A finger rest 10 is screwed onto the head of the piston 9 via a metal holder 12, and the finger rest 10 and the piston 9 are always attached toward the outside of the cylinder 2 by the compression coil spring 1. Forced. A stopper 24 prevents the piston 9 from being pulled out from the cylinder 2, and is formed as a part of a cover cylinder 25 screwed onto the head of the cylinder 2. The piston 9 collides with this stopper 24 and normally stands still in the state shown in the left half of FIG.

The piston 9 and the finger rest 10 are provided with a leak hole 13 that communicates with the bottom of the piston 9 and the head of the finger rest 10, and the inside of the cylinder 2 is connected to the atmosphere through this leak hole 13. It's communicating.

On the outer periphery of the piston 9, there are four O-rings 14, 15, 16, 17, which are elastic seal rings made of an elastic material.
is attached to form a seal with the inner surface of the cylinder 2. The first O-ring 14 is attached to a rotating ring 21 that is rotatably fitted to the outer periphery of the piston 9 near the end thereof. Therefore, when the piston 9 is rotated about the axis, the one-rotation ring 21 does not rotate due to the frictional resistance between the first O-ring 14 and the inner wall of the cylinder 2. The valve body 20 (described later) and the rotating ring 21 rotate relative to each other. Reference numeral 22 denotes a retaining ring fitted into the piston 9 to prevent the one-turn ring 21 from coming off the piston 9.

The second O-ring 15 connects the air pipe 7 and the water supply 1! when in a stationary state. Il? It is installed in a position between 8 and 8. 1st I! - An annular groove 18 is formed on the outer peripheral surface of the piston 9 facing the inlet lower a of the air pipe 7 between the second O-rings 14 and 15.

One side wall surface of the groove 18 is formed by the side surface of the rotating ring 21 described above. The bottom of the groove 18 and the leak hole 13 communicate with each other through a plurality of communication holes 19 . The bottom of the groove 18 is formed into a tapered shape with an included angle of about 120 degrees.

Inside the concave groove 18, as shown in FIG. but,
It is attached so as to come into pressure contact with the bottom of the groove 18 and the walls on both sides. The groove 18 is slightly but completely closed by the valve body 20. This valve body 20 is
Since it is completely housed in the concave groove 18 and does not protrude from the outer periphery of the piston 9, it does not always come into contact with the inner wall of the cylinder 2, and is not damaged by the inlet lower a of the air pipe.

The third O-ring 16 is provided between the water pipe 8 and the water supply pipe 6, and the O-ring 17 of vJ4 is provided near the mouth of the cylinder 2. And this third and fourth 0 ring 1
A communication groove 23 is formed on the outer circumferential surface of the piston 9 between 6 and 17.

Next, the operation of the above embodiment will be explained.

In the standby state, air supplied into the cylinder 2 from the air supply pipe 5 is discharged into the atmosphere through the leak hole 13. At this time, the space between the inside of the cylinder 2 and the air supply pipe 7 is closed with the first O-ring 14.

The communication hole 19 is lightly closed by a valve body 20. Therefore, all of the air that has entered the cylinder 2 is released into the atmosphere through the leak hole 13, and no natural air supply occurs.

Furthermore, in this state, even if dirty liquid or the like flows backward through the air pipe 7 from the end side of the insertion section of the endoscope, if the pressure on the air pipe 7 side increases, the valve body 20 will be moved by the pressure. It is pushed out and is strongly pressed against the wall surface of the groove 18. Therefore, backflow is completely prevented by the valve body 20.

To enter the air supply state, the outlet of the leak hole 13 can be blocked from the outside with a fingertip or the like. When the leak hole 13 is blocked, the air supplied from the air supply pipe 5 into the cylinder 2 has no place to go. The air pressure inside the cylinder 2 increases. Then, as shown in FIG. 3, the valve body 20 is pushed open by the atmospheric pressure, and the air in the cylinder 2 is sent out into the air pipe 7 through the communication hole 19. The air then passes through the air pipe 7 and is released from the tip of the insertion section of the endoscope. This is the air supply state.

As shown in the right half of Figure ff11, when the piston 9 is pushed into the cylinder 2 with a fingertip, the water supply state is established. In this state, the water supply pipe 6 and the water pipe 8 communicate with each other via the communication groove 23, and water supplied from the water supply pipe 6 is sent to the water pipe 8. Then, the water passes through the water pipe 8 and is discharged from the tip of the insertion section of the endoscope. At this time, 1 air pipe entry lower a
are closed by second and third O-rings 15,16.

After using the endoscope, the pipes 5 and 6 for air and water supply are
, 7.8, and when cleaning the inside of the cylinder 2, etc., loosen and remove the cover tube 25 from the head of the cylinder 2, and pull out the piston 9 from the cylinder 2. At this time, the compression coil spring 11 causes the cover tube to 25 stopper 24
Since the piston 9 and the piston 9 are in pressure contact with each other, the piston 9 rotates about the axis together with the cover cylinder 25.

On the other hand, the one-rotation ring 21 is connected to the first O-ring 14 and the cylinder 2.
Since it does not rotate due to the frictional resistance between it and the inner wall, the concave groove 1
The valve body 20 and the rotating ring 21 within the valve body 8 rotate relative to each other. Since one side wall surface of the groove 18 is formed by the side surface of the rotating ring 21, it is possible to prevent the valve body 20 and the groove 18 from sticking together. If the concave f11!18 is stuck, the sticking can be released.

Note that the piston 9 may be rotated by a method other than rotating the cover cylinder 25, such as by rotating the finger rest 1O.

4 and 5 show second and third embodiments of the present invention, which are different from the first embodiment described above.

The only difference is mainly the valve body. The other parts are cover tube 2
5 is composed of an outer synthetic resin part 25a and an inner insert metal part 25b, and has the same structure as the embodiment of St except that a washer 30 is installed between the flange of the cylinder 2 and the operating part l. ing. The main parts thereof are given the same reference numerals as in the first embodiment, and the explanation thereof will be omitted.

FIG. 4 shows an O-ring 31 made of an elastic material used as a valve body. It is installed in JlB, and its function and operation are the same as in the first embodiment described above.

FIG. 5 shows an elastic seal ring and a valve body integrally formed of rubber. 41 is an elastic seal ring that seals between the piston 9 and the cylinder 2;
The cylinder 2 is formed into a short, thin-walled cylindrical shape, and its ends are opened outward by the air pressure inside the cylinder 2. In this case, since the valve body 42 rotates together with the one-turn ring 21, when the piston 9 is rotated, the wall surface portion of the groove 18 formed by the piston 9 and the valve body 42 rotate relative to each other. This prevents sticking between them.

[Effects of the Invention] According to the air supply operating device for an endoscope of the present invention, when on standby, the valve body can close the communication hole leading to the air supply pipe to prevent the occurrence of natural air supply, and the valve body can prevent the occurrence of natural air supply. Even if there is a backflow of sewage from the valve, the valve body is strongly pressed against the wall of the groove, completely preventing the sewage from gushing out.Moreover, the backflow of sewage prevents the valve body from sticking. This has the excellent effect of preventing this by simply rotating the piston and ensuring normal air supply at all times.

[Brief explanation of the drawing]

261 is a sectional view of the first embodiment of the present invention, FIG. 2 is a perspective view of the valve body of the embodiment, and FIG. 3 is a partially enlarged sectional view of the embodiment in the air supply state. - Figure 5 is a sectional view of the second and third embodiments of the present invention. 2... Cylinder, 5... Air supply pipe, 7... Air supply pipe,
7a... Air pipe inlet, 9... Piston, 13...
leak hole. 14.41... Elastic seal ring, 18... Concave groove,
19...Communication hole, 20,31.42...Valve body.

Claims (1)

[Claims] A cylinder and a piston fitted into the cylinder are provided in the operation section of the endoscope, and an air supply pipe that supplies air into the cylinder and an insertion section of the endoscope from inside the cylinder are provided. An air supply pipe that sends air to the tip is connected to the cylinder, and the piston is provided with an elastic seal ring that seals the fitting part between the piston and the cylinder and a leak hole that communicates with the atmosphere.When on standby, the air supply pipe is connected to the cylinder. The air supplied into the cylinder is discharged into the atmosphere through the leak hole, and when air is supplied, the air in the cylinder is sent out to the air supply pipe by blocking the leak hole. The mirror air supply operating device includes an inlet of the air supply pipe formed in the side wall of the cylinder, an annular groove formed on the outer periphery of the piston facing the inlet, and a bottom of the groove and the A communication hole communicating with the leak hole is bored, and a valve body made of an annular elastic body is crimped into the groove so as not to contact the inner wall of the cylinder, wherein one of the grooves is An air supply operation device for an endoscope, characterized in that a side wall surface is formed to be rotatable about an axis relative to the piston, and the elastic seal ring is attached to a member forming the side wall surface.