JPS6399831A - Pipeline change-over device of endoscope - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention switches between a suction line for sucking mucus and the like from a body cavity and a fluid injection line for injecting air, water, and other fluids into a body cavity. The present invention relates to a pipe switching device for an endoscope.

[Prior Art] When performing an examination or treatment inside a body cavity using an endoscope, it is necessary to suction and remove mucus, blood, medicinal solutions, etc. in the body cavity. Injecting air or non-flammable gas (carbon dioxide, nitrogen gas, etc.) into the body cavity to ensure
It is necessary to inject water, physiological saline, etc. to ensure a distance from the inner wall of the body cavity.

Therefore, conventionally, a suction conduit that communicates between a suction device and a suction port that opens into the insertion section of an endoscope, and a fluid injection tube that communicates between a fluid injection port and a fluid jet port that opens into the insertion section of an endoscope. A switching valve is provided in the middle of each pipeline, and each of these switching valves is operated by an operating section to perform suction and injection of fluid (for example, Japanese Utility Model Publication No. 47-34000). .

[Problems to be Solved by the Invention] Generally, when operating an endoscope, the left hand holds the operating section, and the right hand moves the insertion section forward and backward, inserts treatment tools, etc., and operates the imaging device. It is desirable to perform operations such as fluid injection with the fingertips of the left hand holding the operation part, and
Conventionally, the operating parts of endoscopes have been developed based on this idea.

However, in the conventional pipe switching device for an endoscope, the switching valve for the suction pipe and the switching valve for the fluid injection pipe are each separately provided in the operating section, as described above. However, it was difficult to place the operating section in a position where it could be easily operated with the fingertips of the left hand holding the operating section. As a result, either one of the switching valves (
In general, it is very difficult to operate the switching valve for the suction line (switching valve for the suction line) with the fingertips of the left hand, and as a result, the operation must be performed with the right hand, which can cause problems such as having to interrupt operations such as insertion, treatment, or imaging. There were operational shortcomings.

It is an object of the present invention to provide a conduit switching device for an endoscope that eliminates such conventional drawbacks and has good operability.

[Means for solving the problem] A suction line connecting a suction bag, ie, a suction port that opens to the insertion portion of the endoscope, and a fluid injection port and a fluid jet port that opens to the insertion portion of the endoscope. and a switching valve provided in the operation section of the endoscope and inserted between the suction pipe and the fluid injection pipe to switch the pipes. do.

[Function] By switching one switching valve, mucus and the like can be suctioned and removed from the suction port to the suction device, or water, air, or other fluid can be jetted into the body cavity from the fluid spout.

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

FIG. 1 shows a first embodiment of the invention.

1 is an operation part of the endoscope, 2 is an insertion part, a suction port 4 opens parallel to an observation window 3 provided at the tip of the insertion part 2, and a fluid jet port 5 opens toward the observation window 3. are doing. 6 is a suction device provided outside the endoscope, 7 is a fluid inlet for injecting air or nonflammable gas (carbon dioxide, nitrogen gas, etc.), and the suction device 6 and the fluid injection lower are made of, for example, a polyethylene tube. The suction port 4 and the fluid jet port 5 are connected to the suction port 4 and the fluid injection port 5 by a suction pipe line 8 and a fluid injection pipe line 9. A switching valve 10 for switching the pipes is inserted in the middle of the pipes 8, 9.

The switching valve 10 consists of a cylinder 11 that is fixedly installed in the operating part 1 and opens outward, and a piston 12 that is fitted into the cylinder 11 so as to be able to move forward and backward. The above polyethylene tubes (suction line 8, fluid injection line 9) are connected via connection pipes 13 (a, b, c, cl). Further, the piston 12 is provided with a through hole 12a that passes through the piston 12 in the axial direction and communicates the inside of the cylinder 11 with the outside air. Reference numeral 14 denotes a check valve that acts to prevent air, etc. from flowing backward through the fluid injection pipe line 9 from the distal end side of the insertion section, and reference numeral 15 indicates a forceps insertion port that sends forceps etc. to the distal end side of the insertion part through the suction pipe line 8. be.

The tip side portion 12b of the piston 12 has a narrow outer diameter and is loosely fitted into a stopper 16 screwed onto the tip of the cylinder 11.
are in contact with each other and are prevented from coming off from the cylinder 11. A bushing button 17 that comes into contact with the fingertip during operation is screwed onto the tip of the piston 12, and a coil spring 18 inserted between the bushing button 17 and the stopper 16 pushes the piston 12 out. It is energized toward the right side (in the ER1 diagram).

O-rings 19 (a, b, c, d) for sealing are installed in four circumferential grooves on the outer periphery of the piston 12, and the first and second O-rings 19a are located on the tip side.

A communication groove 20 is formed between 19b, and normally the suction device 6 communicates with the outside air via this communication groove 20 and a split yI21 formed at the tip of the cylinder 11, and the outside air is sucked through there. It is sucked into the device 6. The connecting pipe 13b that communicates with the suction port 4 is connected to the second and third O-rings 19b.
, 19c, and is completely cut off from other pipes.

Further, although the fluid injection pipe line 9 communicates with the fluid jet port 5 at the tip via the bottom of the cylinder 11, compared to the pipe line resistance of the through hole 12a formed in the piston 12, the cylinder i
Since the pipe resistance of the fluid injection pipe line 9 extending from the fluid injection port 5 to the fluid injection port 5 is significantly larger, all the air or nonflammable gas injected from the fluid injection lower part is discharged to the outside through the through hole 12a. Then, as shown by the two-dot chain line in FIG. 11, when the through hole 12a is closed with a fingertip, all the air and the like are ejected from the fluid ejection port 5 of the insertion portion.

FIG. 2 shows the state when the piston 12 is pushed into the cylinder 11 from the state shown in FIG.
On the other hand, the suction conduit 8 communicates through the communication groove 20, and mucus and the like are suctioned from the suction port 4 at the tip.

FIG. 3 shows a state in which the operating section 1 of the endoscope according to the above embodiment is held with the left hand, and as described above, switching between the suction line and the fluid injection line is performed using one switching valve 10. Therefore, the switching valve IO can be easily operated using only the index finger of the left hand holding the operating section 1.

FIG. 4 shows an embodiment in which the present invention is applied to an endoscope for biliary tract examination, bladder examination, or the like. In this embodiment, the piston 42 is not provided with a through hole, and the fluid injection lower is connected to a supply device such as water or saline, and the water or saline is supplied to the fluid spout hole 5 at the tip. It gushes out all the time. In this way, the inside of the biliary tract or the bladder can be observed without being constantly washed. Then, when the piston 42 is pushed in, suction is performed from the suction port 4 at the tip in exactly the same manner as in the case shown in FIG. Since the other parts are completely the same as those in FIG. 1, the same reference numerals are given to the drawings and explanations thereof will be omitted.

FIG. 5 shows a third embodiment of the present invention, in which a suction line 8 and a fluid injection line 9 are both connected to a cylinder 51 facing each other. Normally, the fluid injection conduit 9 communicates through the communication groove 50, and water etc. are always sent out to the fluid spout 5 at the tip, and the suction device 6 sucks outside air through the through hole 52a. .

When the piston 52 is pushed in, the suction pipe 8 is connected in a straight line through a communication hole 53 formed perpendicularly to the axis of the piston, and suction is performed from the suction port at the tip. 54
．． 55 is a bottle and a long groove that prevent the piston 52 from rotating. In this embodiment, when the piston 52 is pushed in, the suction pipe 8 communicates in a straight line, so the suction pipe 8
You can clean the inside of the tube by inserting a cleaning brush etc.

[Effects of the Invention] According to the pipe switching device for an endoscope of the present invention, the suction pipe and the fluid injection pipe can be switched with one switching valve, so the switching valve can be connected to an appropriate position on the operating section. By arranging it in this position, all pipe switching operations can be easily performed with the fingertips of the left hand holding the operating section.Moreover, the operating section is smaller and lighter, making it much easier to operate than before. improve. Furthermore, safety is improved because there is no risk of erroneous operation such as accidentally operating an adjacent valve, and the structure is simplified, resulting in cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a first embodiment of the present invention, Fig. 2 is a side sectional view showing the state in which the pipe line of the embodiment is switched, and Fig. 3 is an operation of an endoscope according to the embodiment. FIG. 4 is a side sectional view of the second embodiment of the present invention, and FIG. 5 is a side sectional view of the third embodiment of the present invention. ■...Operation part, 2...Insertion part, 4...Suction port, 5
... Fluid spout, 6... Suction device, 7... Fluid inlet, 8... Suction pipe line, 9... Fluid injection pipe line, lO
...Switching valve, 11.41.51...Cylinder, 12
,42.52...piston.

Claims (1)

[Claims] 1. A suction conduit that connects a suction device and a suction port that opens into the insertion section of an endoscope, and connects a fluid inlet and a fluid jet port that opens into the insertion section of the endoscope. and a switching valve provided in the operation section of the endoscope and inserted between the suction pipe and the fluid injection pipe to switch the pipes. Endoscope pipe switching device. 2. The pipe switching device for an endoscope according to claim 1, wherein the fluid is gas. 3. The pipe switching device for an endoscope according to claim 1, wherein the fluid is a liquid. 4. The above-mentioned switching valve consists of a cylinder and a piston fitted into the cylinder so that it can move forward and backward. Normally, both the suction pipe and the fluid injection pipe communicate with the outside air at the switching valve, and the fluid injection pipe By blocking the passage to the outside air, the fluid in the fluid injection pipe is ejected from the fluid jet port at the tip, and by pushing the piston into the cylinder, the fluid injection pipe is closed and the suction pipe is at the tip. A conduit switching device for an endoscope according to claim 1 or 2, which communicates with a suction port. 5. The switching valve is composed of a cylinder and a piston fitted into the cylinder so as to be able to move forward and backward, and normally the suction line communicates with the outside air at the switching valve, and the fluid injection line communicates with the fluid jet port at the tip. The endoscope according to claim 1 or 3, wherein the fluid is ejected and the piston is pushed into the cylinder, thereby closing the fluid injection line and communicating the suction line with the suction port at the tip. pipe switching device. 6. The endoscope pipe switching device according to claim 1, wherein the suction pipes communicate in a straight line in the switching valve.