JPH09220194A - Valve equipment for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable simple setting and detouching without using a C-ring and to enable to adjust connecting force at will between a piston part and a cylinder part. SOLUTION: In this vacuum valve equipment (to send air or water), to a cylinder main body 14, an engaging ditch 15 is attached. And at a piston part consists of a push button 17 and a piston 18, to the outer circle of a part fitting 16R of a supporter 16, a projection 20 to be engaged with the engaging ditch 15 is provided. The fitting part 16R is divided by a slit 21. Between the fitting part 16R and the piston 18, a push member 23 is provided. The push member 23 rotates by force of the piston 18 and causes deflection of the fitting part 16R outward or inward. With inward deflection, installation of the piston 18 is easy, while with outward deflection, the connecting force between the piston and cylinder parts is strong.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for an endoscope, and more particularly, to a suction valve, an air supply / intake device provided in an endoscope operating portion.
The present invention relates to a structure for attaching and detaching a valve device used as a water supply valve.

[0002]

2. Description of the Related Art An endoscope is provided with a means for sucking air, water, contents or the like from the body to be observed, and a means for supplying air or water (such as physiological saline) into the body to be observed. In order to operate these, valve devices such as a suction valve and an air / water supply valve are arranged.

FIG. 6 shows the structure of a conventional suction valve device. In the figure, in the endoscope operation section, a cylindrical cylinder main body 2 of a cylinder portion is attached to a case body 1, and an introduction pipe 3 and a discharge pipe 4 are connected to the lower side of the cylinder main body 2. An engagement groove 5 having an arc-shaped cross section is annularly formed on the inner circumference of the cylinder body 2 near the upper opening.

On the other hand, in the piston portion, a piston 6 and a push button 8 integrally joined to the piston 7 are movably supported by a support 6 so that the piston 7 is at a predetermined position.
A ring (shown in section) 9 is provided. A metal C ring 10 is disposed in the groove in the fitting portion 6R on the lower side of the support body 6. The C-ring 10 has a cut portion K as shown in FIG. 7, and is bent inward or outward due to the presence of the cut portion K.

According to the above construction, when the support body fitting portion 6R of the piston portion is pushed into the cylinder portion, the C ring 10 of the fitting portion 6R bends inward as shown in FIG. 6B. , Fit into the engagement groove 5 of the cylinder body 2. In this way, the piston portion can be attached to the cylinder portion with one touch, and conversely, the piston portion can be removed with one touch by pulling it while twisting it slightly.

[0006]

However, in the above-mentioned conventional valve device, a nurse or the like must remove the piston part from the cylinder part during cleaning, but this piston part may be difficult to remove. There was a problem. That is, the C ring 10 has the fitting portion 6
Since there is a gap with R, it is in an unstable position, and since it bends by shortening the distance K at one location, the bending method differs depending on the position of the outer circumference of the ring. Therefore, the operating force required to attach / detach the piston varies.
The piston part may be easy or difficult to remove.

It is also conceivable that the piston part may come off during operation of the valve device by a doctor or the like. That is, the operation button 8 is biased upward by the return spring 11 as shown in FIG. 6 (B), and in the case of an operator with a short finger, the operation button 8 is released at the lowest position. This operation button 8
Also, the piston 7 is returned vigorously, which may cause the piston portion to come off. Therefore, the size of the C-ring 10 and the like can be changed to further harden the coupling between the piston portion and the cylinder portion, but in this case, removal during cleaning becomes more difficult.

The present invention has been made in view of the above problems, and an object thereof is to enable one-touch attachment / detachment without using a C ring and to appropriately change the coupling strength between the piston portion and the cylinder portion. Another object of the present invention is to provide a valve device for an endoscope in which the piston part can be easily removed during cleaning and the possibility of popping out during operation can be eliminated.

[0009]

In order to achieve the above object, according to the present invention, a lead-in / out pipe is connected and arranged, and a cylinder portion having an engagement groove formed in the inner periphery thereof, and a cylinder portion which moves up and down in the cylinder portion. A piston that opens and closes the lead-in / out pipe, and a tubular body that supports the piston so that the piston can move up and down, and a protrusion that engages with the engagement groove of the cylinder portion is provided on the outer periphery thereof.
A slit for giving a bend to the protrusion is formed so as to be directed toward the center of the piston axis, and the piston support is rotated with the rotation of the piston and is in contact with the inner wall of the piston support. A pressing member arranged, and an uneven shape is provided between the pressing member and the piston support so that the amount of flexure of the piston support toward the outside changes depending on the rotational position of the pressing member. It is characterized by that.

According to the above construction, the fitting portion provided with the projecting portion of the support body is bent inward due to the presence of the slot when this is mounted, and due to this bending, the projecting portion is engaged with the cylinder portion. Fitted in the groove, the piston part can be attached to the cylinder part with one touch. Then, when the piston is turned by the operation button or the like to rotate the pressing member, for example, the convex portion formed on the pressing member gradually presses the inner wall of the piston support. As a result, the support body bends outward, the engagement between the protrusion on the outer periphery of the support body and the engagement groove of the cylinder portion becomes strong, and the piston portion is firmly fixed to the cylinder portion.

On the other hand, if the piston is turned in the opposite direction to rotate the pressing member in the opposite direction, the pressing force becomes small and finally the free state is reached, and the piston part can be easily removed from the cylinder part. Become. As described above, according to the present invention, the operation force for attaching and detaching the piston portion can be appropriately changed depending on the rotational position of the pressing member, which facilitates removal during cleaning and prevents the piston portion from being easily removed during use. Can be

[0012]

1 to 3 show the configuration of a valve device for an endoscope according to a first example of the embodiment,
This is used as a suction valve, FIG. 1 shows a state after mounting, FIG. 2 shows a state before mounting, and FIG. 3 shows a cross-sectional view of the piston portion cut near the upper surface of the pressing member. First, as shown in FIGS. 1 and 2, a cylinder-shaped cylinder body (cylinder portion) 14 is attached to a case body 1 of an endoscope operation portion, and the cylinder body 14 includes a distal end portion of the endoscope. An introduction pipe 3 provided and a discharge pipe 4 connected to the suction device are attached. Thus, the engagement groove 15 having an arc-shaped cross section is formed in an annular shape in the inner periphery of the cylinder body 14 near the upper opening.

On the other hand, in the piston portion, a piston 18 in which a push button 17 is integrally connected to a support 16 is provided with a return spring 11
An O-ring (shown by a cut surface) 9 is provided on the piston 18 so as to be movable up and down. A tubular fitting portion 16 having a slightly smaller diameter is provided below the support body 16.
R is integrally provided, and the protrusion 2 is provided on the outer periphery of the fitting portion 16R.
0 is provided. Further, in the fitting portion 16R, a slit (cut) 21 is formed with a length from the lower end to a little above the protrusion 20 toward the piston shaft. That is, in this example, two slits 21 (four slits, six slits, etc.) are provided at intervals of 180 degrees, and the presence of the slits 21 causes the fitting portion having the protrusion 20 to be formed. A small amount of 16R will bend inward or outward.

Thus, in the apparatus, as shown in FIG. 1, the piston 1 is provided inside the fitting portion 16R of the support body 16.
8, the cap-shaped pressing member 23 is independently arranged. That is, the lower side of the push button 17 of the piston 18 is partially cut on both side surfaces of the cylinder as shown in FIG. 3, and the pressing member 23 has a width of both cut surfaces of the outer circumference of the piston 18. The rectangular engaging hole 24 is formed. Therefore, when the engagement hole 24 engages with the outer peripheral cut surface of the piston 18, the pressing member 23 rotates together with the piston 18. The pressing member 23 is restricted from moving in the vertical direction by the internal structure of the support member 16 and is prevented from moving up and down together with the piston 18.

Further, on the lower side of the outer periphery of the pressing member 23, arc-shaped convex portions 26 projecting toward the inner wall of the support body 16 (fitting portion 16R) are formed at two positions separated by 180 degrees. On the inner wall of the one-side fitting portion 16R, a gentle arc-shaped concave portion 27 (which may be tapered) is formed corresponding to the above-mentioned two convex portions 26.

With the convex portion 26 and the concave portion 27, the free state is obtained at the position of FIG. 3A, but as shown in FIG. 3B, the pressing member 23 is rotated clockwise, for example. When moved, the convex portion 26 presses the concave portion 27, and as the rotational position of the convex portion 26 moves toward the end portion side of the concave portion 27, the fitting portion 16R moves outward with a greater force. Will be pushed to. The number of sets of the above-mentioned concavo-convex structure may be one set, or three or four sets.

The first example of the embodiment is constituted as described above,
At the time of mounting, when the fitting portion 16R is pushed into the cylinder body 14 while holding the support body 16 from the state of FIG.
6R is inserted into the cylinder body 14 while being bent inward together with the protrusion 20 due to the presence of the slot 21. At this time, the protrusion 20 is engaged with the engagement groove 15 of the cylinder body 14.
The piston portion can be attached to the cylinder portion by one-touch by fitting into.

When the push button 17 is rotated from the state shown in FIG. 3A, for example, in the clockwise direction (which may be the counterclockwise direction), the pressing member 23 also integrally rotates, as described above.
The convex portion 26 presses the end portion side of the concave portion 27 of the fitting portion 16R. As a result, the fitting portion 1 of the support body 16
6R bends slightly to the outside, and the connection between the projection 20 on the outer periphery of the fitting portion 16R and the engagement groove 15 of the cylinder body 14 becomes strong. This prevents the piston from popping out during use.

On the other hand, when the piston portion is to be removed for cleaning or the like, the push button 17 is rotated counterclockwise from the state shown in FIG. 3 (B), as shown in FIG. 3 (A).
The pressing state of the pressing member 23 against the inner wall of the fitting portion 16R is released. Then, if the support 16 is pulled up while being slightly twisted, the piston portion can be removed from the cylinder portion with one touch.

In this suction valve device, in the state shown in FIG. 1, the atmosphere is sucked toward the outlet pipe 4 side through the inside as indicated by the solid arrow 100. On the other hand, when the push button 17 is pressed, the inflow path of the atmosphere is closed by the piston 18 and the introduction tube 3 is opened, and the air or water in the observation target body is introduced from the distal end portion of the endoscope through the introduction tube 3. Etc. can be sucked.

FIGS. 4 and 5 show the configuration of a second example in which the present invention is applied to an air / water feeding valve device. FIG.
3, the cylinder body 30 is provided with an air supply inlet pipe 31 and an outlet pipe 32, a water inlet pipe 33 and a water outlet pipe 34, and an engagement groove 36 is formed in the inner periphery of the cylinder body 30 near the upper opening. Are formed in a ring shape. On the other hand, a push button 39 and a piston 40 are provided on the support member 38 of the piston portion so as to be movable up and down via the return spring 11, and the fitting portion 38R of this support member 38 has the same structure as in FIG. On the protrusion 4
3 is provided, and two slits 44 are formed.

Thus, in this case as well, the pressing member 45 is arranged inside the fitting portion 38R and between the piston 40. That is, as shown in FIG. 5, both sides of the intermediate portion of the piston 40 are partially face-cut, and in the pressing member 45, an elongated hole-like engagement hole 46 that contacts both cut surfaces of the outer periphery of the piston 40. Is formed. Therefore, when the engagement 46 engages with the outer peripheral cut surface of the piston 40, the pressing member 45 rotates together with the piston 40. The pressing member 45 is also restricted from moving in the vertical direction by the internal structure of the support 38, and is prevented from moving up and down together with the piston 40.

On the lower side of the outer periphery of the pressing member 45,
Arc-shaped convex portions 47 projecting toward the inner wall of the fitting portion 38R are formed at two positions separated by 180 degrees, while the inner wall of the fitting portion 38R has a gentle arc shape (may be a tapered shape). The concave portion 48 is formed. With such a configuration, the free state is obtained at the position of FIG.
As shown in (B), when the pressing member 45 is rotated clockwise, for example, the convex portion 47 presses the concave portion 48, and the rotation position of the convex portion 17 is the concave portion. 48
The fitting portion 38R is pushed outward with a greater force as it goes toward the end portion side.

Also according to the configuration of the second example described above, the fitting portion 38R is pushed into the cylinder body 30 while being bent inward together with the protrusion 43 at the time of mounting, and the protrusion 43 is inserted into the cylinder body 30. The piston portion is attached to the cylinder portion by one-touch by fitting it into the engaging groove 36 of. Then, when the push button 39 is rotated, for example, in the clockwise direction from the state of FIG. 5A, the pressing member 45 is also integrally rotated, and the convex portion 47 thereof has the concave portion 4 of the fitting portion 38R.
The end side of 8 is pressed. As a result, the fitting portion 38R of the support body 38 bends slightly outward, and the protrusion 3 on the outer periphery thereof.
6 and the engagement groove 43 of the cylinder body 30 are firmly connected.

On the other hand, when the piston portion is removed for cleaning or the like, by rotating the push button 39 counterclockwise from the state shown in FIG. 5B, the pressing member 45 is pushed as shown in FIG. 5A. The pressed state of the fitting portion 38R against the inner wall due to is released. Therefore, if the support body 38 is pulled up while being slightly twisted, the piston portion can be easily removed from the cylinder portion.

In this air / water feeding valve device, in the state of FIG. 4, the air feeding inlet pipe 31 and the air outlet pipe 32 are opened, and air is fed to the distal end portion of the endoscope. On the other hand, when the push button 39 is pressed, the inlet pipe 31 and the outlet pipe 32 are closed, and the water supply inlet pipe 33 and the outlet pipe 34 are opened.
Water is thus supplied.

[0027]

As described above, according to the present invention,
A piston support body that is divided by slits and has a protrusion is fitted into a cylinder portion that has an engagement groove on the inner periphery, and a pressing force that rotates with the piston is provided between the piston support body and the piston. Since a member is provided and the piston support is bent outward by the rotation of the pressing member,
One-touch attachment / detachment is possible without using the C-ring.
Moreover, it is possible to change the coupling strength between the piston portion and the cylinder portion.

Therefore, by lowering the bonding strength during cleaning, the piston part can be easily removed, and by increasing the bonding strength during use, the possibility of jumping out during operation can be eliminated. Become.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a configuration of an endoscope valve (suction valve) device according to a first example of an embodiment.

FIG. 2 is a diagram showing a state before mounting a piston portion in the suction valve device of FIG.

3A and 3B are cross-sectional views of the piston portion of FIG. 1 taken in the vicinity of the upper surface of the pressing member, FIG. 3A being a free state of the pressing member, and FIG. 3B being a pressing state of the pressing member. .

FIG. 4 is a partial cross-sectional view showing the configuration of an air / water supply valve device according to a second example.

5A and 5B are cross-sectional views of the piston portion of FIG. 4 taken in the vicinity of the upper surface of the pressing member, FIG. 5A showing a free state of the pressing member, and FIG. 5B showing a pressing state of the pressing member. .

FIG. 6 is a partial cross-sectional view showing a configuration of a conventional endoscope valve (suction valve) device, in which FIG. 6A is a state before mounting and FIG.

FIG. 7 is a plan view showing the configuration of the C ring of FIG.

[Explanation of symbols]

 2, 14, 30 ... Cylinder body, 5, 15, 36 ... Engaging groove, 6, 16, 38 ... Supporting body, 7, 18, 40 ... Piston, 8, 17, 39 ... Push button, 10 ... C ring, 16R, 38R ... Fitting portion, 20, 43 ... Projection portion, 21, 44 ... Slotting, 23, 45 ... Pressing member, 24, 46 ... Engaging hole, 26, 47 ... Convex portion, 27, 48 ... Recessed portion Department.

Claims (1)

[Claims] 1. A cylinder portion having an inlet / outlet pipe connected thereto and having an engagement groove formed on the inner periphery thereof, a piston which moves up and down in the cylinder portion to open / close the inlet / outlet pipe, and the piston is vertically movable. It is a supported tubular body,
A protrusion that engages with the engagement groove of the cylinder portion is provided on the outer periphery of the piston, and a piston support body having a slit formed to allow the protrusion to bend is formed toward the center of the piston axis. A pressing member that is rotated with movement and that is arranged so as to come into contact with the inner wall of the piston support,
And an uneven shape is provided between the pressing member and the piston support so that the amount of flexure of the piston support toward the outside changes depending on the rotational position of the pressing member. Valve device for endoscopes.