JPS6320532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an air supply operation device for an endoscope that can send nonflammable gas into a body cavity as necessary.

Generally, when a high-frequency treatment instrument is introduced into a body cavity through an endoscope channel and the affected area is treated with high-frequency waves, explosions occur from food residue in the large intestine, especially when the affected area is the large intestine. There is a risk of ignition of toxic gases, such as methane gas, resulting in an explosion. Therefore, when treating the affected area in the large intestine with high frequency waves, it is necessary to replace the explosive gas accumulated in the large intestine with nonflammable gas such as carbon dioxide.

For this reason, in conventional endoscopes, one end is connected to the operating section and the other end is connected to the supply device.The first conduit sends normal air to the universal cord, and the other end connects to the supply device. The operating section is provided with a first switching valve and a second switching valve. By operating the first switching valve, the first conduit is connected to the third conduit provided in the insertion section of the endoscope, and by operating the second switching valve, the first conduit is connected to the third conduit provided in the insertion section of the endoscope. The second pipe line was connected to the third pipe line, so that air or nonflammable gas could be selectively sent into the body cavity.

However, with such a configuration, the operating section must be provided with relatively large first and second switching valves, which may result in an increase in size and weight of the operating section, or the need to install two relatively large switching valves on the operating section. There were problems with operability, such as the presence of a switching valve, which could easily lead to operational errors. Further, by providing two conduits in the universal cord, the diameter of the universal cord increases, which causes problems such as difficulty in operating the endoscope while bending the universal cord.

This invention was made based on the above circumstances, and its purpose is to reduce the size and weight of the operating section without providing two switching valves in the operating section.
and the universal cord is provided with only one conduit, so that the conduit can be selectively used as a passage for air or nonflammable gas,
It is an object of the present invention to provide an air supply operation device for an endoscope that can improve operability.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 1 in FIG. 1 is an endoscope. In this endoscope 1, a rear end of an insertion section 3 is connected to an operation section 2, and a curved section 4 and a distal end forming section 5 are sequentially provided at the distal end of the insertion section 3. A universal cord 6 is connected to the operating section 2 at one end, and a plug 7 is installed at the other end of the universal cord 6. The plug 7 has an end tube 8 containing an end portion of a light guide fiber bundle (not shown) and an inlet body 9 protruding from the plug 7 . The plug 7 is detachably connected to a plug receiver 11 serving as an external connection port of the supply device 10. This plug receiver 11 has a receiving hole 1 into which the end pipe 8 is fitted.
2, and a discharge port 13 into which the inlet body 9 fits. Furthermore, the supply device 10 includes:
A power switch 14 and a changeover switch 15 for switching the supply of air and nonflammable gas as described later are provided, and a CO 2 cylinder 16 which is a nonflammable gas supply source is connected, and the air supply source is connected to a CO ₂ cylinder 16. An air supply pump 17 (shown in FIG. 2) is built-in.

The CO ₂ cylinder 16 and the air pump 17 are connected to various devices within the supply device 10 as shown in FIG. That is, the air pump 17
A first pipe line 18 is connected to the CO ₂ cylinder 16.
A second conduit 19 is connected to. 1st above
An electromagnetic four-port switching valve 20 is interposed between the conduit 18 and the second conduit 19. That is, the first pipe line 18 is connected to the normally open port of the switching valve 20, and the second pipe line 19 is connected to the normally closed port. Further, an electromagnetic two-port on-off valve 21 is interposed in the second conduit 19 with its normally closed port connected, and on the outflow side of this on-off valve 21, the first conduit 18 and the second The conduit 19 merges with the conduit 19, and this merged portion communicates with the discharge port 13. By connecting the air inlet body 9 to this discharge port 13, the first and second pipes 18 and 19 can be internally viewed via the third pipe line 22 built into the universal cord 6. It is connected to a fourth conduit 23 provided in the insertion section 3 of the mirror 1.

The third conduit 22 and the fourth conduit 23 are connected at the operating section 2 of the endoscope 1, and this section is provided with a switching mechanism 24, which will be described later.
As shown in FIG. 3, there is a reverse valve 2 that restricts the flow of fluid flowing into the pipe line 23 only in the direction of the arrow in the figure.
5a is interposed.

The switching mechanism 24 is constructed as shown in FIG. That is, an end tube 26 that opens on the outer surface of the operating section 2 and forms a leak hole 25 is connected to the end of the third conduit 22, and a tubular pusher body 27 is fitted into this end tube 26. There is. This pusher 27
The cover plate 3 is biased in the projecting direction by a spring 28 and is screwed onto an annular wall portion 29 formed on the operating portion 2 so as not to be pulled out from the end tube 26.
It is held by 0. In addition, the pusher 2
An actuating rod 31 is protruded from the actuating rod 7, and a first micro switch 32 is provided in the operating section 2, facing the actuating rod 31. This first microswitch 32 is electrically connected to a control circuit 33 provided within the supply device 10. The control circuit 33 is connected to the electromagnetic on-off valve 21 . When the first microswitch 32 is turned on by pressing the actuation rod 31, the signal is input to the control circuit 33. On the other hand, the supply device 10
When the changeover switch 15 provided in the gas switch 15 is switched to the nonflammable gas side, the changeover valve 20 is activated. When this switching valve 20 operates, the second micro switch 34 is activated by its operating shaft 20a.
is turned on, and a signal is input from this second microswitch 34 to the control circuit 33. When signals are input from the first and second microswitches 32 and 34 to the control circuit 33, a signal is output from the control circuit 33 to the on-off valve 21, and the on-off valve 21 is actuated by this signal. It's getting old.

Next, the operation of the above configuration will be explained. First, when the power switch 14 is turned on with the changeover switch 15 set to the air side, the air pump 17 is activated and compressed air is discharged into the first pipe line 18. The compressed air discharged into this first pipe line 18 passes through the normally open port of the switching valve 20 and enters the atmosphere from the leak hole 25 of the end pipe 26 connected to this end via the third pipe line 22. leaks to. Here, when the operator closes the leak hole 25 with his or her fingers, the compressed air that has flowed into the third conduit 22 is
flows into the fourth pipe line 23 connected to the pipe line 22 of
The liquid flows out from the distal end portion 5 of the insertion portion 3 where the open end of the insertion portion 3 is located. Note that by closing the leak hole 25 with your finger or the like, the pushing body 27 of the switching mechanism 24 is pressed, so the first micro switch 32 is turned on.
However, since the switching valve 20 is not operating at this time, no signal is output from the control circuit 33 to the on-off valve 21.

On the other hand, if it is desired to replace the inside of the body cavity with CO ₂ gas, the changeover switch 15 is switched to the nonflammable gas side. Simultaneously with the operation of the changeover switch 15, the changeover valve 20 is activated to close the first conduit 18, open the second conduit 19, and open the second conduit 19.
The micro switch 34 is turned on. At this time,
CO ₂ gas flows from the CO ₂ cylinder 16 into the second pipe line 19 and passes through the switching valve 20 .
If only the switching valve 20 is switched, the on-off valve 21 provided in front of the switching valve 20 shuts off the second pipe line 19, so the CO ₂ gas will not flow beyond the on-off valve 21. That is, CO ₂ gas flows through the third pipe 2
Leak hole 2 communicating with the second conduit 19 via 2
There is no leakage from 5. Next, when the operator presses the pushing body 27 of the switching mechanism 24 with his fingers to close the leak hole 25, the actuating rod 31 activates the first micro switch 32 by this operation.
Turn it on. Then, since the activation signals of the first and second microswitches 32 and 34 are input to the control circuit 33, a signal is output from the control circuit 33 to the on-off valve 21, and the on-off valve 21 is
is activated to release the second pipe line 19 from the blocked state. Therefore, the CO ₂ gas that has flowed from the CO ₂ cylinder 16 into the second conduit 19 flows through the third conduit 22 to the fourth conduit 23 and from this fourth conduit 23 into the body cavity. and replaces the inside of this body cavity with CO ₂ gas. At this time, if you lift a part of your finger from the leak hole 25 and slightly open the leak hole 25 while pressing the pusher 27, the CO ₂ gas will flow out from the leak hole 25, allowing the body cavity. It is possible to adjust the amount of CO ₂ gas sent into the system.

Note that this invention is not limited to the above embodiment,
For example, although the on-off valve 21 is operated when both the first and second microswitches 32 and 34 are turned on, the second microswitch 34 may be omitted, and only the first microswitch 32 is activated. It may be activated by a signal. Also, the second
If a micro switch 34 is provided, when this switch 34 is turned on, the air supply pump 1
If a circuit is provided to turn off the air pump 7, when the discharge side of the air pump 17 is closed by the switching valve 20, no load will be applied to the air pump 17.

Furthermore, as shown in FIG.
The CO ₂ cylinder 16 is connected to the pipe line 19 rather than the switching valve 20.
While an on-off valve 21 is provided on the side, the switching valve 20
The operation causes the second pipe line 19 to communicate with the third pipe line 22, and the first pipe line 18 communicates with the switching valve 2.
The air supply leak pipe 35 may be connected to the outflow side of the normally closed port of No. There is no need to put a load on 17.

In the other embodiment shown in FIG. 4, the same parts as in the above-mentioned embodiment are given the same symbols and the explanation thereof will be omitted.

As described above, according to the present invention, the endoscope and the supply device are connected through the third conduit, and the first conduit to which the air pump is connected is connected to the third conduit. Alternatively, the second pipe line connected to the nonflammable gas supply source can be selectively communicated via an on-off valve and a switching valve. Therefore, since the endoscope and the supply device are connected through only one third conduit, there is no need to provide two conduits in the universal cord as in the conventional case, which reduces the diameter of the universal cord. This makes it easier to operate the endoscope while bending this universal cord. In addition, since we were able to create a configuration that does not require the above-mentioned on-off valve and switching valve in the endoscope operating section, the operating section can be made smaller and lighter, which also improves the operability of the endoscope. will improve. In addition, when the leak hole is closed, a switch is turned on to open the on-off valve. Therefore, the feeling of air being delivered is transmitted to the finger closing the leak hole, and by slightly opening the leak hole, the amount of air being delivered (gas) can be delicately controlled, and the surgeon feels a sense of accomplishment when delivering air. It has advantages such as being able to be detected and giving consideration to patient safety (not over-inflating).

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a block diagram of a pipeline system showing fluid flow, FIG. 3 is an enlarged sectional view showing a switching mechanism, and FIG. FIG. 4 is a block diagram of a pipeline system showing another embodiment of the present invention. 1... Endoscope, 2... Operation section, 3... Insertion section,
6... Universal cord, 10... Supply device,
16... CO ₂ cylinder (nonflammable gas supply source), 17
...Air pump, 18...First pipe line, 19...
Second pipe line, 20... switching valve, 21... on-off valve,
22...Third pipe line, 23...Fourth pipe line, 24
...Switching mechanism, 25...Leak hole, 32...First
micro switch.

Claims (1)

[Claims] 1. A first pipe connected to an air supply pump, a second pipe connected to a nonflammable gas supply source, and a normally closed pipe provided in the second pipe. a supply device comprising an on-off valve that is open when activated, and a switching valve that selectively communicates either the first pipe line or the second pipe line with the external connection port body; a third conduit connected to the mouth body;
a leak hole means for communicating the third conduit with the atmosphere at the operating section; a fourth conduit having one end communicating with the third conduit and the other end opening to the outside of the distal end of the endoscope;
a switch that is turned on when the leak hole means is closed and slightly pushed in, and an endoscope connected to the supply device, and the switching valve connects the second pipe line to the outside An air supply operation device for an endoscope, characterized in that the opening/closing valve is opened by turning on the switch when communicating with the connection port body.