JPH0411688Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is capable of switching between a suction operation that suctions dirty liquid etc. from the body cavity and a water supply operation that pumps water and other liquids into the body cavity. Concerning pipe switching devices for endoscopes, this pipe switching device is particularly suitable for use in relatively small-diameter endoscopes that are used while filled with water, such as cystoscopes and cholangioscopes. It is related to the device.

[Prior art] For example, when observing the inside of the bladder through the urethra,
The water in the bladder is clear enough to not interfere with observation.
Once the organ is inflated by water supply, observation can be continued in good condition. If the water filling the organ becomes dirty due to bleeding during a biopsy, etc., by suctioning it and re-supplying the water,
Observation can be continued again.

Therefore, the endoscope used in this way is
A function that allows suction and water supply to be performed at will is required, and conventional endoscopes that satisfy this function have a suction channel and a water supply channel that open separately at the tip, and a separate water supply channel in the operation section. The device is connected to a suction switching valve and a water supply switching valve, respectively, and by switching these valves, suction or water can be selectively supplied from the tip.

[Problems to be solved by the invention] In the conventional endoscope pipe switching device described above, the suction channel and the water supply channel were provided independently and separately from each other, so the insertion part became thick and could not be inserted into the body cavity. It was not possible to insert the device deep into the body, and the operating section had two switching valves, making the operating section as large as a large-diameter endoscope, resulting in significantly poor operability. .

Therefore, in order to eliminate such drawbacks, the applicant proposed a method for selectively suctioning or supplying water from the tip of the insertion tube using one switching valve through one channel that opens at the tip of the insertion tube. The company first filed an application for a pipe switching device for an endoscope that enabled this (Japanese Patent Application No. 1981-81648).

This invention further improves the conduit switching device to provide an endoscope conduit switching device that has excellent insertion and operability as an endoscope and can perform suction and water supply at will. The purpose is to

[Means for Solving the Problems] In order to solve the above-mentioned problems, the endoscope pipe switching device according to the present invention is provided in the operation section of the endoscope and connected to the suction means and the water supply means. the switching valve, and one channel that opens at the tip of the insertion section and whose base end is connected to the switching valve, and selectively suctions or supplies water from the tip of the insertion section through the one channel. In the pipe switching device for an endoscope, the switching valve is provided with an operating button that can be rotated and pushed, and when the operating button is pushed in at the first rotational position, the channel is switched through the channel. It is characterized in that water is supplied and suction is performed by pressing the operation button at the second rotational position.

[Operation] If you place the operation button in the first position and press it,
Water is supplied from the tip of the insertion tube through the channel, and if you turn the operation button to the second position and push it in,
Suction is performed from the tip of the insertion section through the channel.

[Example] An example of the present invention will be described based on the drawings.

FIG. 2 is an overall schematic diagram of the endoscope channel switching device of the present invention, in which 1 is the operating section of the endoscope, and 2 is the insertion section. The operation unit 1 includes an external suction device (suction means) 3 and a water tank (water supply means) 4.
A switching valve 5 is provided which is connected to. From the water supply tank 4, water pressurized by a head under atmospheric pressure or by a pressure pump is supplied to the switching valve 5. 13 is a suction pipe that connects the suction device 3 and the switching valve 5, and 14 is a water supply pipe that connects the water tank 4 and the switching valve 5.

Reference numeral 6 denotes one channel that opens at the distal end 7 of the insertion section, and the base end of this channel 6 is connected to the switching valve 5.
It is connected to the. Further, a forceps insertion port 8 is formed near the lower end of the operating section 1 by branching from the middle of the channel 6 . 9 is a known forceps plug attached to the forceps insertion port 8.

FIG. 1 is an external perspective view of the switching valve 5, and FIG. 3 is a sectional view. Figure 3 is for ease of explanation.
Portions on different cross sections are illustrated on the same drawing, and the positional relationship of each portion in the rotational direction is illustrated in FIGS. 4 to 7.

In the figure, 11 is a cylinder fixed to the operating section 1, and a suction pipe 13 and a water supply pipe 14 are connected to each other from the outside. A relief 34 having a large inner diameter is formed on the bottom side of the cylinder 11, and the channel 6 is connected to the cylinder 11 through the relief 34. 12 is a vent hole that communicates the inside of the cylinder 11 with the atmosphere;
FIG. 5 shows their positional relationship.

A deformed piston 15 made of an elastic material such as synthetic rubber is inserted into the cylinder 11 so as to be movable forward and backward. This irregularly shaped piston 15 has seal portions 16a to 16 that are in close contact with the inner wall of the cylinder 11.
c, and two communication grooves 17a and 17b are formed between the inner wall of the cylinder 11 and the inner wall of the cylinder 11.
17c is a notch for reducing the contact area between the irregularly shaped piston 15 and the inner wall of the cylinder 11 to lower sliding resistance, and the upper end side of the irregularly shaped piston 15 is also provided with a notch as shown in FIG. A similar notch 17d is formed in.

A metal rod 18 is integrally fixed to the irregularly shaped piston 15, and by pushing in an operation button 19 screwed to the head of the rod 18, the irregularly shaped piston 15 is pushed into the cylinder 11.

In addition, a stopper 20 screwed onto the mouth of the cylinder 11 causes the irregularly shaped piston 15 to move into the cylinder 11.
I've learned not to let go from within. A coil spring 21 is interposed between the stopper 20 and the operation button 19, and the coil spring 21 urges the operation button 19, together with the irregularly shaped piston 15, outward. Therefore, when the operation button 19 is not pressed, the irregularly shaped piston 15
is always at the stopper 20 as shown in FIG.
It is stationary at the position where it touches.

The operation button 19 is formed with a lever 22 projecting laterally for rotating the operation button 19 and positioning the operation button 19 in its rotational direction. A claw 23 is formed at the lower part of the lever 22 to protrude inward. This claw 23 is formed to be rotatable within a circumferential groove 24 formed on the outer periphery of the mouth of the cylinder 11, and the rotation range of the operation button 19 is regulated by this circumferential groove 24. . Also, the circumferential groove 2
First and second guide grooves 25 and 26 are formed at both ends of the cylinder 11, and the lever 22 is inserted into one of the guide grooves 2.
Only when the operating button 19 is in position 5, 26 can the irregularly shaped piston 15 be pushed into the cylinder 11.

Figures 4 to 7 are - in Figure 3.
This is a sectional view taken along the line 1-2, showing a state in which the lever 22 is above the position of the first guide groove 25 (first position) and the operation button 19 is not pressed. As shown in these figures, in this state, the suction pipe 13 and the vent hole 12 communicate with each other via the first communication groove 17a, and the atmosphere is sucked through the vent hole 12. On the other hand, the entrance to channel 6 is
It is sealed by a deformed piston 15.

Therefore, neither water supply nor suction is performed from channel 6.

Note that when the lever 22 is rotated above the position of the second guide groove 26 (second position) and the operation button 19 is not pushed in, as shown in FIG. Suction pipe 13 and ventilation hole 1 via 17b
2 communicates with each other. Therefore, when the operation button 19 is not pressed, the atmosphere is sucked from the vent hole 12 and neither water supply nor suction is performed from the channel 6, regardless of whether the lever 22 is in the first or second position. .

FIG. 9 shows a state in which the lever 22 is located at the first position and the operation button 19 is pushed in, and FIG. 10 is a cross-sectional view taken along the line -1. In this state, the suction pipe 13
and the ventilation hole 12 communicate with each other, and air is sucked through the ventilation hole 12. On the other hand, the water supply pipe 14 and the channel 6 communicate with each other through the second communication groove 17b, and air flows from the tip of the insertion portion through the channel 6. Water gushes out.

FIG. 11 shows a state in which the lever 22 has been rotated to the second position and the operation button 19 has been pushed in, and FIG. 12 is a cross-sectional view taken along the line -2. In this state, the suction tube 13 and the channel 6 communicate with each other via the second communication groove 17b, and suction is performed from the distal end of the insertion portion through the channel 6. In this state, the suction pipe 13 and the ventilation hole 12 are not communicating with each other, and the water supply pipe 14 is sealed by the irregularly shaped piston 15.

[Effects of the invention] According to the pipe switching device for an endoscope of this invention, suction or water supply can be selectively performed through one channel, so the insertion section can be formed thin, and the switching This can be done with a single switching valve provided in the operating section, so operability is good and observation and diagnostic capabilities can be greatly improved. In addition, since suction and water supply can be switched by pressing the operation button in a single motion at different rotational positions, the structure of the switching device can be extremely simple, allowing the device to be made smaller in diameter and lighter in weight. It has excellent effects such as:

[Brief explanation of drawings]

Fig. 1 is an external perspective view of one embodiment of the present invention;
The figure is an overall schematic diagram of the embodiment, FIG. 3 is a longitudinal sectional view of the pipe switching device of the embodiment, and FIG. 4 is the -
5 is a - line sectional view, FIG. 6 is a - line sectional view, FIG. 7 is a - line sectional view, and FIG. 8 is a - line sectional view.
Figure 9 is a cross-sectional view of the state in which it has been rotated to the position shown in Figure 1.
Fig. 10 is a longitudinal cross-sectional view of the operation button in the pressed position, Fig. 10 is a cross-sectional view along the - line, and Fig. 11 is a cross-sectional view of
FIG. 12 is a vertical sectional view showing the operation button pressed in at the position shown in FIG. 1... Operation section, 2... Insertion section, 3... Aspirator,
4...Water tank, 5...Switching valve, 6...Channel, 7...Insertion section tip, 11...Cylinder, 1
3... Suction pipe, 14... Water supply pipe, 15... Irregular piston, 19... Operation button, 22... Lever, 23
...Claw, 24...Circumferential groove, 25, 26...Guide groove.

Claims (1)

[Scope of utility model registration request] comprising a switching valve provided in the operating section of the endoscope and connected to the suction means and the water supply means, and one channel that opens at the distal end of the insertion section and whose proximal end is connected to the switching valve, In the pipe switching device for an endoscope that allows selective suction or water supply from the distal end of the insertion section through the single channel, the switching valve is provided with an operation button that can be rotated and pushed. , an endoscope characterized in that when the operating button is pushed in at the first rotational position, water is fed through the channel, and when the operating button is pushed in at the second rotational position, suction is performed. Mirror pipe switching device.