JP2003310541A - Conduit changeover operating valve for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conduit changeover operating valve for an endoscope in which operability in an endoscope operating part is improved by miniaturizing and lightening the conduit changeover operating valve for the endoscope provided with a plurality of seal means on a piston body. <P>SOLUTION: In the conduit changeover operating valve for the endoscope in which a piston body 20 is equipped with a plurality of seal means 31 and 32 for respectively sealing a gap between a fluid supply port 15 and a fluid feed-out port 17 and a gap between both the openings 15 and 17 and the mouth of a cylinder body 12 when not communicating the openings 15 and 17. A seal member 30 is provided while being integrally formed with the plurality of seal means 31 and 32 and composed of an elastic material, and the seal member 30 is mounted on the piston body 20. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope conduit switching valve for switching conduits for supplying air and water to an endoscope.

[0002]

2. Description of the Related Art Among endoscopic examinations of various parts of the human body, for example, in examinations for the biliary tract, urology or gynecology, physiological saline is circulated through an endoscope through an endoscope. Endoscopic observation is performed in water.

Therefore, in such an endoscopic examination, the water supply operation valve arranged in the operation section is always in the water supply state (standby state), and the operation of stopping the water supply is performed when it is necessary to take a picture. Be seen.

The water supply operation valve for performing such operation is
Generally, at least one of a water supply port and a water supply port that are opened in the cylinder body is formed on a side surface of the cylinder body, and by moving the piston body forward and backward in the cylinder body, a space between the water supply port and the water supply port is formed. The communication state is configured to switch.

In order to prevent a leak between both openings and a water leak from the mouth of the cylinder body when the water feed port and the water feed port are not communicated with each other, between the water feed port and the water feed port and between them and the mouth of the cylinder body. A plurality of sealing means, such as O-rings, which respectively seal between the two, are attached to the piston body at intervals.

[0006]

However, if a plurality of sealing means are attached to the piston body with a space therebetween, the size of the apparatus is increased and the operability of the endoscope operating portion is increased. It becomes a factor to decrease.

In view of the above, the present invention can improve the operability of the endoscope operating section by realizing the downsizing and weight reduction of the endoscope channel switching operation valve in which a plurality of sealing means are provided in the piston body. An object of the present invention is to provide a conduit switching operation valve for an endoscope that can be used.

[0008]

In order to achieve the above object, the conduit switching operation valve for an endoscope according to the present invention has at least one of a fluid supply port and a fluid delivery port which are opened in the cylinder body and which has a cylinder body. It is formed on the side surface and configured to switch the communication state between the fluid supply port and the fluid delivery port by moving the piston body back and forth in the axial direction in the cylinder body. A plurality of sealing means for respectively sealing between the openings when they are not communicated with each other and between the openings and the mouth of the cylinder body. A seal member made of an elastic material, which is integrally formed with the seal means, is provided, and the seal member is attached to the piston body.

A plurality of sealing means are side-face seals which are in close contact with the inner wall surface of the cylinder body along the edge of one of the fluid supply port and the fluid delivery port which is formed on the side surface of the cylinder body. It may include a means and a circumferential seal means that is in close contact with the inner circumferential surface of the cylinder body over the entire circumference.

Further, the sealing member may be formed in a substantially cylindrical shape as a whole, and a plurality of sealing means may be formed on the outer surface thereof, and the plurality of sealing means may form a gap therebetween. If they are arranged adjacent to each other, the size can be further reduced.

It should be noted that rotation restricting means for preventing the piston body from rotating around the axis in the cylinder body may be provided. Further, in the standby state in which the piston body is not operated, the fluid supply port and the fluid delivery port are in communication with each other, and the operation of pushing the piston body closes the space between the fluid supply port and the fluid delivery port. It may be one.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 4 shows the operation unit 1 of the endoscope.

The lower half portion of the operating portion 1 is a grip portion 1a, and the base end of the insertion portion 2 is connected to the lower end thereof. A bending operation lever 3 is arranged on the side surface of the upper half of the operation unit 1,
The water supply operation valve 10 arranged on the front surface is in a water supply state during standby when the operation button 11 is not pushed in, and the water supply is stopped by pushing the operation button 11.

FIG. 1 shows the water supply stopped state in which the operation button 11 of the water supply operation valve 10 is pushed in, and FIG. 2 shows the standby state. Cylinder body 12 arranged in the operation unit 1
Is fixed to the operation unit 1 by a fixing nut 13 in a state where the mouth opens to the outer surface of the operation unit 1.

A water supply port 15 (fluid supply port) formed on the side wall of the cylinder body 12 is connected to a water supply pipe 15a through which water is supplied, and a water supply port formed on the bottom of the cylinder body 12 is formed. A water supply pipe 17a leading to the tip of the insertion portion 2 is connected to 17 (fluid outlet).

A piston body 20 is arranged in the cylinder body 12 so as to be movable back and forth in the axial direction. Piston body 20
Positioning pin 2 attached to the side of the
0a engages with the linear groove 12a formed in the mouth portion of the cylinder body 12, whereby the piston body 20
Are positioned in the cylinder body 12 in the rotational direction.

An insulating cover 22a made of an electrically insulating plastic having a claw that can be engaged with and disengaged from the fixed nut 13 is provided on the outer peripheral surface of the piston receiving cylinder 22 arranged so as to surround the protruding end side half of the piston body 20. But piston receiving tube 2
2 is integrally formed.

A button seat 24, which is a mounting seat for the operation button 11, is screwed and connected to the projecting end of the piston body 20, and a compression coil spring is provided between the button seat 24 and the bottom surface of the piston receiving cylinder 22. The return spring 25 is disposed so as to be sandwiched. Reference numeral 26 is an index cylinder fitted in the axial position of the operation button 11.

In this way, these (operation button 1
1, piston receiving cylinder 22, button seat 24, return spring 2
5, the index cylinder 26) and the piston body 20 and the like constitute a piston unit (A shown in FIG. 3),
The piston body 20 is in a state of being urged outward (in a direction projecting from the mouth of the cylinder body 12) by the return spring 25 inside the cylinder body 12.

At a position near the rear end of the piston body 20 located inside the cylinder body 12, the piston body 20 is in close contact with the inner peripheral surface of the cylinder body 12 over the entire circumference, and the mouth opening of the cylinder body 12, the water supply port 15, and the feed port. Circumferential seal portion 31 that seals between water inlet 17 and water inlet 17 when in the water supply state shown in FIG.
A seal member 30 having an inner wall surface of the cylinder body 12 and a side surface seal portion 32 that closely contacts with the inner surface of the cylinder body 12 is attached along the edge portion of 5.

The circumferential seal portion 31 and the side surface seal portion 32 are made of an elastic material such as silicone rubber or the like, and are formed in a substantially cylindrical shape as a whole as a seal member 30.
The water supply operation valve 10 can be downsized, and the operation unit 1 can be downsized and lightened.

The seal member 30 includes a piston unit A.
As shown in FIG. 3, a collar-shaped circumferential seal portion 31 that makes a round around the outer surface near the lower end thereof and a side surface seal portion 32 that protrudes to the outer surface in a so-called "navel" shape are almost open. They are arranged adjacent to each other (or partially overlapping each other).

Then, the cylindrical portion 30a of the seal member 30.
Is fitted into a circumferential groove portion 20b formed in the piston body 20, and a positioning protrusion 30b (FIG. 1) is formed so as to project inward from the cylindrical portion 30a for positioning the seal member 30 with respect to the piston body 20. , See FIG. 2)
Is a positioning hole 20 formed at the bottom of the circumferential groove 20b.
It is designed to fit in c. As a result, the side surface seal portion 32 is always positioned so as to surround the edge portion of the water supply port 15 during standby.

In the endoscope line switching valve of the embodiment thus constructed, the piston body 20 is located closer to the mouth of the cylinder body 12 than the water supply port 15 as shown in FIG. Evacuated, water supply port 15 and water supply port 1
Water is sent from the water supply port 15 to the water supply port 17 in communication with the water supply port 7, and water leakage to the mouth side of the cylinder body 12 is blocked by the circumferential seal portion 31.

When the operation button 11 is pushed in as shown in FIG. 1, the side seal portion 32 closes the water supply port 15 and the circumferential seal portion 31 closes the water supply port 17, and the water supply port is closed. A leak between the water supply port 15 and the water supply port 17 is prevented by both the circumferential seal portion 31 and the side surface seal portion 32, and the water supply is stopped.

At the same time, water leakage from the water supply port 15 to the mouth side of the cylinder body 12 is prevented by the side surface seal portion 32,
Leakage between the water supply port 17 and the mouth side of the cylinder body 12 is prevented by the circumferential seal portion 31.

The present invention is not limited to the above-mentioned embodiment, and for example, the standby state may be a state in which the water supply is stopped, or the present invention may be applied to the air supply operation device of the endoscope or the air supply / water supply. It can be applied to operating devices.

[0028]

According to the present invention, a plurality of sealing means are provided for sealing between the fluid supply port and the fluid delivery port when not communicating with each other, and between the openings and the mouth of the cylinder body. In a conduit switching operation valve for an endoscope provided on a piston body, a sealing member made of an elastic material integrally forming the plurality of sealing means is provided, and the sealing member is attached to the piston body. This makes it possible to reduce the size and weight of the conduit switching operation valve and improve the operability of the endoscope operation section.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which water supply is stopped in a conduit switching operation valve of an endoscope according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a water supply state of the endoscope according to the embodiment of the present invention when the pipe path switching operation valve is on standby.

FIG. 3 is a composite view of a vertical sectional view and a perspective view of a piston unit according to an embodiment of the present invention.

FIG. 4 is a side view of the operation portion of the endoscope according to the embodiment of the present invention.

[Explanation of symbols]

10 Water supply operation valve 11 operation buttons 12 cylinder body 15 Water supply port (fluid supply port) 17 Water inlet (fluid outlet) 30 Seal member 30a cylindrical part 31 Circumferential seal part (seal means) 32 Side seal part (seal means)

Claims (6)

[Claims] 1. At least one of a fluid supply port and a fluid delivery port opened in a cylinder body is formed on a side surface of the cylinder body, and the piston body is moved forward and backward in the cylinder body, whereby the fluid supply is performed. It is configured to switch the communication state between the mouth and the fluid delivery port,
The piston body is provided with a plurality of sealing means for sealing between the openings when the fluid supply port and the fluid delivery port are not in communication with each other and between the openings and the mouth of the cylinder body. In the duct line switching operation valve for an endoscope, a seal member made of an elastic material integrally formed with the plurality of seal means is provided, and the seal member is attached to the piston body. Pipeline switching valve for endoscopes. 2. A plurality of sealing means are annularly formed on an inner wall surface of the cylinder body along an edge of one of the fluid supply port and the fluid delivery port formed on the side surface of the cylinder body. 2. The conduit switching operation valve for an endoscope according to claim 1, further comprising: a side sealing means that is in close contact with the inner peripheral surface of the cylinder body; 3. A pipe line switching operation for an endoscope according to claim 1, wherein said sealing member is formed in a substantially cylindrical shape as a whole, and said plurality of sealing means are formed on an outer surface thereof. valve. 4. A conduit switching operation valve for an endoscope according to claim 1, wherein the plurality of sealing means are arranged adjacent to each other with almost no gap between them. 5. A pipe line switching operation for an endoscope according to claim 1, wherein rotation regulating means is provided for preventing the piston body from rotating around the axis in the cylinder body. valve. 6. The fluid supply port and the fluid delivery port communicate with each other in a standby state where the piston body is not operated, and the fluid supply port and the fluid are communicated by pushing in the piston body. The conduit switching operation valve for an endoscope according to claim 1, 2, 3, 4, or 5, wherein a space between the delivery port and the delivery port is closed.