JPH0630161Y2 - Air supply operation device for endoscope - Google Patents

Description

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

[Prior Art] This type of endoscope air supply operation device releases air supplied into a cylinder from a leak hole bored in a piston to the atmosphere during standby, and leaks air during air supply. The air is sent out to the air supply pipe connected to the cylinder by closing the air gap with a fingertip or the like.

However, in such a configuration, a small amount of air is sent out into the air supply pipe even during standby, so-called natural air supply is generated from the tip of the insertion portion, and the pressure in the body cavity of the patient is increased against the intention of the operator. There were inconveniences such as rising too much.

Therefore, conventionally, a thin umbrella-shaped flexible valve body attached to the outer peripheral portion of the piston and contacting the inner surface of the cylinder is provided in the air flow path between the leak hole and the air supply pipe, and this valve body is in standby. Has blocked the flow of air to the air supply pipe, and at the time of air supply, the leak hole is blocked and the air pressure in the cylinder that rises causes the valve element to open and air is sent out from the air supply pipe ( JP-A-59-11828).

[Problems to be solved by the invention] However, in the above-mentioned one, since the end portion of the thin umbrella-shaped valve body was in contact with the inner wall of the cylinder, when the piston is advanced and retracted in the cylinder by water supply operation or the like. In addition, the thin end of the valve body sometimes touches and damages the edge of the inlet of the air supply pipe that opens to the inner surface of the cylinder. If the end of the valve body is damaged, the leak hole and the air supply pipe communicate with each other even during standby, and natural air supply occurs. Further, in such a state, when the internal pressure of the body cavity is increased, an inconvenient situation has occurred in which the waste liquid in the body cavity flows back and is blown out from the leak hole.

The present invention solves such drawbacks of the prior art, and reliably blocks the flow of air to the air supply pipe during standby so that spontaneous air supply does not occur, and the air flows backward from the body cavity. It is an object of the present invention to provide an air supply operation device for an endoscope, which can prevent spouting of dirty liquid.

[Means for Solving the Problems] In order to achieve the above object, an endoscope air supply operation device of the present invention includes a cylinder and a piston inserted into the cylinder to operate the endoscope. And an air supply pipe for supplying air into the cylinder and an air supply pipe for sending air from the inside of the cylinder to the tip of the insertion portion of the endoscope are connected to the cylinder, and a leak hole communicating with the atmosphere is provided in the piston. By drilling, during standby, the air supplied from the air supply pipe into the cylinder is released into the atmosphere through the leak hole,
At the time of air supply, in the air supply operation device for an endoscope in which the air in the cylinder is sent out to the air supply pipe by closing the leak hole, the inlet of the air supply pipe is formed in the side wall portion of the cylinder. An annular groove is formed on the outer circumference of the piston facing the inlet, a communication hole for communicating the bottom of the groove with the leak hole is formed, and the cross-sectional shape is expanded to a substantially V shape. A valve body, which is shaped like a ring and is made of an annular elastic body as a whole, is crimped into the groove so as not to contact the inner wall of the cylinder.

[Operation] During standby, the valve element provided in the groove on the outer periphery of the piston closes the communication hole, and all the air that has entered the cylinder from the air supply pipe is released into the atmosphere through the leak hole. .
Even if there is a back flow of filthy liquid or the like through the air supply pipe, when the pressure on the air supply pipe side increases, the valve body is expanded by the pressure and strongly pressed against the wall surface of the concave groove.

During air supply, if the leak valve is closed with a fingertip or the like, the air in the cylinder is sent out into the air supply pipe while deforming the valve element, and air is supplied.

The valve body is always in the concave groove and does not contact the inner wall of the cylinder.

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

FIG. 1 shows an embodiment of the present invention, in which the left half is in a stationary state without pushing the piston 9 (standby state and air supply state), and the right half is in a state in which the piston 9 is pushed into the cylinder 2. (Water supply state) is shown.

In the figure, 1 is the operation unit main body. Reference numeral 2 is a cylinder fixed inside the operation portion main body 1 by a nut 3. 2a is a cylinder 2
Lid that closes the bottom of the. Reference numeral 4 is an O-ring for sealing. On the side wall of the cylinder 2, an air supply pipe 5 for supplying air into the cylinder 2 is connected near the bottom, and a water supply pipe 6 for supplying water is connected near the mouth. In addition, at the middle portion of the side wall of the cylinder 2, the inlet 7a of the air supply pipe 7 and the water supply pipe 8 which are open to the outside at the distal end (not shown) of the endoscope,
An opening 8a is formed.

A piston 9 is inserted in the cylinder 2 so as to be able to move back and forth. A finger pad 10 is screwed to the head of the piston 9 via a receiving plate 12, and the finger pad 10 and the piston 9 are constantly urged toward the outside of the cylinder 2 by a compression coil spring 11. ing. Reference numeral 24 denotes a stopper that prevents the piston 9 from coming out of the cylinder 2, and is formed as a part of a cover cylinder 25 screwed to the head of the cylinder 2. The piston 9 hits the stopper 24 and normally stands still in the state shown in the left half of FIG.

The piston 9 and the finger tip 10 are provided with a leak hole 13 communicating with the bottom of the piston 9 and the head portion of the finger tip 10 so that the inside of the cylinder 2 and the atmosphere can be communicated with each other through the leak hole 13. It is in communication.

On the outer circumference of the piston 9, four O-rings 14, 15, 1
Reference numerals 6 and 17 are mounted so as to seal the interior surface of the cylinder 2. The first O-ring 14 is attached to a rotary ring 21 rotatably fitted around the outer periphery of the piston 9 near the end thereof. Therefore, when the piston 9 is rotated about the axis, the rotary ring 21 does not rotate due to the frictional resistance between the first O-ring 14 and the inner wall of the cylinder 2, so that the V-shaped ring that rotates with the piston 9 rotates. The valve body 20 (described later) and the rotary ring 21 rotate relative to each other. Two
Reference numeral 2 denotes a retaining ring that is fitted into the piston 9 so that the rotary ring 21 does not come off from the piston 9.

The second O-ring 15 is mounted at a position between the air supply pipe 7 and the water supply pipe 8 in the stationary state. First and second
Between the O-rings 14 and 15 of the
On the outer peripheral surface of the piston 9 facing a, an annular groove 18 is formed.
Are formed. 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 in a tapered shape with an included angle of about 120 degrees.

In the groove 18, as shown in FIG. 2, a valve body 20 having a substantially V-shaped cross-sectional shape that expands outward and made of an annular elastic body (for example, made of silicon rubber) as a whole is provided. The groove 18 is mounted so as to come into pressure contact with the bottom portion and the wall portions on both side surfaces. The groove 18 is completely closed by the valve body 20 although it is light. Since the valve body 20 is completely accommodated in the groove 18 and has not traveled from the outer circumference of the piston 9, it does not always come into contact with the inner wall of the cylinder 2 and may be damaged by the inlet 7a of the air supply pipe. Never.

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

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

In the standby state, the air supplied from the air supply pipe 5 into the cylinder 2 is released into the atmosphere through the leak hole 13. At this time, the inside of the cylinder 2 and the air supply pipe 7 are closed by the first O-ring 14, and the communication hole 19 is lightly closed by the valve body 20. Therefore, all the air that has entered the cylinder 2 is released into the atmosphere through the leak holes 13, and spontaneous air supply does not occur.

Further, in this state, even if sewage or the like flows backward from the distal end side of the insertion portion of the endoscope through the air supply pipe 7, when the pressure on the air supply pipe 7 side is increased, the valve body 20 is caused by the pressure. It is pushed out and strongly pressed against the wall surface of the concave groove 18. Therefore, the backflow is completely blocked by the valve body 20.

To supply air, the outlet of the leak hole 13 may be blocked from the outside with a fingertip or the like. When the leak hole 13 is closed, there is no place for the air supplied from the air supply pipe 5 into the cylinder 2, and the air pressure inside the cylinder 2 rises. Then, the third
As shown in the drawing, the valve body 20 is pushed open by the atmospheric pressure, and the air in the cylinder 2 is sent out into the air supply pipe 7 through the communication hole 19. Then, the air passes through the air supply pipe 7 and is discharged from the tip of the insertion portion of the endoscope. This is the air supply state.

As shown in the right half of FIG. 1, when the piston 9 is pushed into the cylinder 2 with a fingertip, the water is supplied. In this state, the water supply pipe 6 and the water supply pipe 8 communicate with each other through the communication groove 23, and the water supplied from the water supply pipe 6 is sent to the water supply pipe 8. Then, the water passes through the water supply pipe 8 and is discharged from the tip of the insertion portion of the endoscope. At this time, the inlet 7a of the air supply pipe is closed by the second and third O-rings 15 and 16.

[Advantages of the Invention] According to the endoscope air supply operation device of the present invention, the substantially V-shaped valve body closes the communication hole communicating with the air supply pipe during standby, and the valve body is not attached to the inner wall of the cylinder or the like. Since it does not always contact and there is no risk of damage, it is possible to completely prevent the occurrence of natural air supply, and even if there is backflow of waste liquid from the air supply pipe side, the substantially V-shaped valve body pushes. Since it is expanded and strongly pressed against the wall surface of the concave groove, it is possible to completely prevent the spouting of the waste liquid.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a valve body of the embodiment, and FIG. 3 is a partially enlarged sectional view of the embodiment in an air supply state. 2 ... Cylinder, 5 ... Air supply pipe, 7 ... Air supply pipe, 7a ... Air supply pipe inlet, 9 ... Piston, 13 ... Leak hole, 14, 15, 1
6, 17 ... O-ring, 18 ... Recessed groove, 19 ... Communication hole, 20
… Valve disc.

Claims (1)

[Scope of utility model registration request] 1. A cylinder and a piston fitted in the cylinder are provided in an operation portion of the endoscope, an air supply pipe for supplying air into the cylinder, and a tip of an insertion portion of the endoscope from the inside of the cylinder. An air supply pipe for sending air to the cylinder is connected to the cylinder, and a leak hole communicating with the atmosphere is formed in the piston so that the air supplied from the air supply pipe into the cylinder passes through the leak hole during standby. In the air supply operation device of the endoscope, the air in the cylinder is sent out to the air supply pipe by closing the leak hole at the time of air supply. It is formed on the side wall of the cylinder, and an annular groove is formed on the outer periphery of the piston facing the inlet of the cylinder, and a communication hole that connects the bottom of the groove and the leak hole is formed. Spread out A substantially V-shaped valve body made of an annular elastic body as a whole is crimped into the concave groove so as not to contact the inner wall of the cylinder. .