JP3218668B2 - Endoscope fluid supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid supply device for an endoscope used for cleaning an observation window provided at a distal end of an insertion portion of the endoscope.

[0002]

2. Description of the Related Art An endoscope is used to clean its observation window,
Further, a fluid supply device is used for cleaning the inside of a body cavity, further expanding the inside of the body cavity, and the like. This fluid supply device has a configuration in which a nozzle is provided at a position near an observation window at a distal end of an insertion portion, and a liquid such as a cleaning liquid or pressurized air is selectively supplied to the nozzle. In order to control the supply of liquid and pressurized air to the nozzle, a switching valve mechanism is provided in the main body operation unit, and this switching valve mechanism can be operated by a finger of the hand holding the main body operation unit. That is, a fluid flow path is connected to the nozzle, the fluid flow path is branched to form a liquid outflow path and an air outflow path, and the liquid outflow path and the air outflow path are connected to a liquid supply path connected to a liquid tank, and an air pump. Are connected to a switching valve mechanism provided in the main body operation unit together with an air supply path connected to a pressurized air supply source such as the above.

An air supply path and an air outflow path are connected to the switching valve mechanism to supply pressurized air to the nozzles, and a liquid outflow path is connected to the liquid supply path to supply liquid. A valve body for switching between a liquid supply state that can be supplied to the nozzle is provided, and an operation button is connected to the valve body for performing a switching operation of the valve body with a finger of a hand gripping the main body operation unit. . An air release path is provided for releasing pressurized air supplied to the air supply path from the valve body to the operation button to the atmosphere, and the air release path is opened as an air release port at a position where a finger of the operation button contacts. are doing.

The valve body is normally kept in an air supply state, but is made to communicate with the atmosphere through an air atmosphere opening from a pressurized air supply source. As a result, the air is released to the atmosphere. And the pressurized air supply source can be operated without load. When the air opening of the operation button is closed by a finger, the pressure in the air supply path increases, and pressurized air is ejected from the nozzle through the air supply path through the air outflow path and the fluid flow path. When the operation button is pressed, the valve body switches to the liquid supply state, and the liquid surface of the liquid tank is pressurized by the pressurized air supplied from the pressurized air supply source to the liquid tank. The liquid is ejected from the nozzle through the liquid outflow path and the fluid flow path sequentially.

[0005]

By the way, the above-mentioned switching valve mechanism comprises a valve casing having four ports including an air supply path, an air outflow path, a liquid supply path, and a liquid outflow path. Since it is necessary to provide a valve element for communicating and shutting off, the entire configuration of the switching valve mechanism is quite large, and the valve element and the valve casing must be formed of metal due to their properties. Since it is a heavy object, not only does it take up space in the main body operation section and hinder the miniaturization of the main body operation section, but also increases the burden of operations performed by gripping the main body operation section. Also, after using the endoscope, the entire device including the fluid supply device must be cleaned. However, since the switching valve mechanism is located only a distance from the nozzle by the length of the insertion portion, this switching operation is performed. It cannot be denied that the valve mechanism may directly or indirectly come into contact with body waste, and the flow path formed inside the switching valve mechanism is complicated, and the complicated flow path is cleaned. Washability, such as difficulty in cleaning
There is also a problem of poor maintainability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a convenient operation in which a switching operation is performed by a finger of a hand holding a main body operation unit. And control the open air
By providing a switching valve mechanism that controls the liquid feeding state at a position separated from the main unit operation section after being provided in the operation section, the main body operation section is reduced in weight and the burden on the operator is reduced, and the inside of the main body operation section is also reduced. Another object of the present invention is to provide a fluid supply device for an endoscope in which the space of the endoscope is saved and the flow path can be easily cleaned.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a tip provided at a distal end of an insertion portion of an endoscope.
And one end is connected to the nozzle, and the other end is
The air flow path connected to the pressurized air supply source and the pressurized air supply
Connected to a liquid supply tank where the liquid level is pressurized by the supply source
Liquid flow path and valve operation unit provided in the main unit operation unit of the endoscope
And a light source connection portion of the endoscope or the liquid supply portion therefrom.
A switching valve mechanism provided at a position on the side of the supply tank.
The flow path is connected to the pressurized air supply source through the valve operation section.
The liquid flow path passes through the switching valve mechanism, and
Connected to the liquid supply tank without the intervention of a valve operating section,
The valve operating section has a large
An air communication passage is provided, and this air communication passage can be opened and closed manually.
Function, and the pushing operation of the valve operating section is used as a switching signal.
The switching valve mechanism with the liquid supply tank and the nozzle.
It is characterized in that it is configured to be switched so as to communicate between them.

[0008]

[Action] A valve operating section is provided in the main body operating section of the endoscope .
Since the valve operating section has an atmosphere communication passage,
The same operation as the switching valve mechanism provided in the main body operation unit according to the prior art
By the operation, that is, by operating the finger of the hand holding the main body operation unit, the valve body of the switching valve mechanism is changed from the air supply state to the liquid supply state and from the liquid supply state by a signal from the valve operation unit. It can be switched to the air supply state. Since the valve operating section may be a means for generating a signal for switching the valve body of the switching valve mechanism, the structure of the valve operating section provided in the main body operating section is simplified, downsized, and lightweight. Be transformed into Therefore, the operability of the endoscope itself performed by holding the main body operation unit is improved. In addition, since the switching valve mechanism is provided at a position extremely far from the nozzle, there is no possibility that the switching valve mechanism will be soiled, and the entire fluid passage that is performed after the use of the endoscope can be extremely easily cleaned. It will be like that.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, FIG. 1 shows the entire configuration of an endoscope 1. As is apparent from FIG. 1, a main body operation unit 2 for an operator or the like performing the operation to hold and operate by hand. An insertion portion 3 connected to the main body operation portion 2 and inserted into a body cavity or the like; and a connector detachably connected to a light source device (a light source device and a processor in the case of an electronic endoscope) at a distal end. 4a
And a light guide flexible portion 4 provided with
As shown in FIG. 2, an illumination window 5 for illuminating the inside of the body cavity for observation, an observation window 6 for observing the inside of the body cavity and the like under this illumination, forceps and other treatment tools are provided on the distal end surface of the insertion section 3. A treatment tool lead-out port 7 for leading out is provided. Observation window 6
If the object is contaminated with dirt such as body fluid, a sufficient observation field of view cannot be obtained, so that the observation window 6 must be cleaned. In order to clean the observation window 6 and to clean the inside of the body cavity together with the observation window 6 and to inflate the body cavity, a nozzle 8 for supplying cleaning water or air is provided toward the observation window 6. I have. When the observation window 6 is contaminated, first, washing water is sprayed from the nozzle 8 toward the observation window 6 to wash away the dirt, and then, droplets adhered to the observation window 6 by supplying pressurized air. Is removed. Since this operation is appropriately performed during the operation of the endoscope, the configuration is such that the fluid supply operation can be performed in the main body operation unit 2 in consideration of the operability.

FIG. 3 shows the overall configuration of the fluid supply device. In the figure, reference numeral 10 denotes an air pump as a pressurized air supply source, 11 denotes a washing water tank,
0 is connected to an air supply pipe 12 and shown in FIG.
As described above, the inner pipe 1 through which the cleaning liquid flows
A connection pipe 13 composed of a double pipe of 3a and an outer pipe 13b through which air flows is provided, and the air supply pipe 12 and the connection pipe 13 are connected to a switching valve mechanism 14. Also,
Inside the endoscope 1, an air outflow path 15 and a washing water outflow path 16 are provided, and the air outflow path 15 and the washing water outflow path 16 are connected to the fluid flow path 1 near the insertion section 2.
The fluid path 17 is connected to the nozzle 8. The air outflow path 15 and the washing water outflow path 16
Is connected to the switching valve mechanism 14.

Of the inner pipe 13a and the outer pipe 13b constituting the air supply pipe 12 and the connection pipe 13, the air supply pipe 12
And the outer pipe 13b are always in communication with each other. When pressurized air is supplied from the air supply pipe 12, the inside of the cleaning water tank 11 is pressurized, and the cleaning water is supplied to the inner pipe 13a. Will be pumped. Therefore, the outer pipe 13b functions as a tank pressurizing flow path that pressurizes the washing water tank 11. The operation of the switching valve mechanism 14 causes the outer pipe 13b
And the air outflow path 15 are communicated with each other and the inner pipe 13a and the washing water outflow path 16 are shut off to supply air to the nozzle 8, and the outer pipe 13b and the air outflow path 1
5, and the communication between the inner pipe 13a and the washing water outflow passage 16 is established, and the nozzle 8 is switched to a washing water supply state in which washing water is supplied. However, the air supply pipe 12 is designed to be open to the atmosphere via the atmosphere open path 20. When the atmosphere open path 20 is open, no pressure is generated in the air supply pipe 12, and therefore, the switching valve Even when the mechanism 14 is in the air supply state, no air is supplied to the nozzle 8 and the cleaning water tank 11 is not pressurized. At the position of the connector 4a, the open-to-atmosphere path 20 is a double pipe together with the air outflow path 15. This can reduce the number of piping connections, but they may be connected via separate piping connections.

As described above, in this fluid supply apparatus, the air supply pipe 12 is open to the atmosphere where the open air path 20 is opened to the atmosphere, the air supply state where air is supplied to the nozzle 8, and the cleaning water is supplied to the nozzle 8. The state can be switched between three states, i.e., a state of supplying the cleaning water to be supplied to the apparatus 8. This switching is performed by manually operating the valve operation unit 21 provided in the main body operation unit 2. The operation of the valve operation unit 21 includes two modes, that is, opening and closing the open-to-atmosphere path 20 and switching operation of the switching valve mechanism 14. In order to be able to perform these two modes of operation with a single operating member, the valve operating section 21 slidably mounts a piston 23 in a casing 22 attached to the housing 2a of the main body operating section 2,
An operation button 24 operable with a finger is connected to the piston 23.

[0014] The piston 23 and the operation buttons 24 provided the atmosphere communication path 25, and air opening 25a is formed at a position to abut the fingers of the operating button 24, due to the finger
The atmosphere opening 25a can be opened and closed by manual operation . The casing 22 is connected to the open-to-atmosphere 20, and the piston 23 is acted on by a return spring 26. The open-to-atmosphere communication passage 25 provided in the piston 23 always communicates with the open-to-atmosphere 20. It has become. When the operation button 24 is pressed down against the return spring 26 with a finger, the communication between the atmosphere communication path 25 and the atmosphere open path 20 is cut off. However, the washing water outflow passage 16 is
It is not connected to the valve operating section 21. The piston 23 faces an oil chamber 27 formed in the casing 22.
Communicates with a hydraulic flow path 28, and the hydraulic flow path 28 communicates with a hydraulic pipe 29 connected to the switching valve mechanism 14.
Therefore, when the piston 23 is depressed, the pressure oil is supplied from the oil chamber 27 to the switching valve mechanism 14 via the hydraulic flow path 28 and the hydraulic pipe 29, and the switching valve mechanism 1 is supplied by the supply of the pressure oil.
The switching operation of No. 4 is performed.

FIG. 4 shows the switching valve mechanism 14 in an enlarged manner, and FIG. 5 shows a state in which the switching valve mechanism 14 is switched. In the figure, reference numeral 30 denotes a male coupling member, 31 denotes a female coupling member, and the male coupling member 30 is fixed to the connector 4a.
1 is detachably connected by a bayonet mechanism. An air supply pipe 1 is provided on the main body 30a of the male coupling member 30.
2, air outflow channel 15, washing water outflow channel 16 and hydraulic pipe 2
9 is connected. The female coupling member 31 is connected to the connection pipe 13. And the main body 30
a, a first air communication passage 33 for constantly communicating the air supply pipe 12 with the outer pipe 13 b of the connection pipe 13, and a valve chamber 32 for disconnecting the outer pipe 13 b from the air outflow path 15. A second air communication passage 34 is provided. A valve body 35 is slidably mounted in the valve chamber 32, and the valve body 35 is separated from and seated on a valve seat 36, whereby the inner pipe 1 is moved.
The communication between 3a and the washing water outflow passage 16 is interrupted.

The valve body 35 provided in the valve chamber 32 has
A valve section 35 in which an elastic member is attached to a ridge bulging outward at a position near the lower end of a cylindrical sliding section 35a having an open upper end.
b, and a spring receiving portion 35c is connected to a lower end portion of the valve portion 35b, and the valve portion 35b is normally moved by the urging force of the spring 37.
In this state, the inner pipe 13a and the washing water
Is shut off. When the valve body 35 is separated from the valve seat 36 against the urging force of the spring 37, the inner pipe 13a and the washing water outflow path 16 communicate with each other. In this communication state, communication holes 38a and 38b forming a bypass flow path are formed in the spring receiving portion 35c so that the spring 37 is not interposed in the flow path of the washing water.
A communication hole 38c is also formed in the inner pipe 13a, so that when the valve is opened, the inner pipe 13a is connected to the communication holes 38a and 38b, the valve chamber 32,
The communication with the washing water outflow passage 16 from the space inside the sliding portion 35a is sequentially performed through the communication holes 38c. Also, the second
The air communication passage 34 has a tank-side passage portion 34a opened to the outer tube 13b and, as shown in FIG. 6, an arc-shaped passage formed in an arc shape so as to change the direction by 90 ° from the tank-side passage portion 34a. And a pump-side passage portion 34c that opens to the arc-shaped passage portion 34b and has the other end communicating with the air outflow passage 15. A valve seat is provided between the tank-side passage portion 34a and the arc-shaped passage portion 34b. 39 are formed. And
The valve body 40 can be detached from the valve seat 39. When the valve body 40 is seated on the valve seat 39, the communication between the outer pipe 13b and the air outflow passage 15 is interrupted, and the valve seat 39 is opened. When they take off, they will communicate with each other. The valve body 40 is integrally provided with an operation rod 41, and the operation rod 41 is connected to an interlocking operation member 42. A spring 43 acts on the interlocking operation member 42, and the valve element 40 is always kept away from the valve seat 39 by the action of the spring 43.

The valve body 35 and the valve body 40 are displaced in conjunction with each other. Normally, the valve body 35 is seated on the valve seat 36 by the action of the springs 37 and 43 so that the inner pipe 13 is moved.
The communication between a and the washing water outflow passage 16 is cut off, and the valve body 40 is separated from the valve seat 39 so that the outer tube 13b and the air outflow passage 15 communicate with each other. In this state, when a pressure is generated in the air supply pipe 12, an air supply state in which air can be supplied to the nozzle 8 is established. When the valve body 35 is seated on the valve seat 36 against the spring 37 and the valve body 40 is separated from the valve seat 39 against the spring 43, the outer pipe 13b and the air outflow path 15
Between the inner pipe 13a and the washing water outflow passage 16
And the pressure is generated in the air supply pipe 12, the air pipe 12 is always in communication with the outer pipe 13 b through the first communication passage 33.
The inside is pressurized, and the cleaning water is supplied to the nozzle 8 by this pressure. Valve body 35, 40
Is provided on the main body 30a of the male coupling member 30 via the hydraulic flow path 28 and the hydraulic pipe 29 connected to the oil chamber 27 of the valve operating section 21 as described above, and the hydraulic pressure on which the interlocking operation member 42 faces When pressure oil is supplied to the working chamber 44,
It switches in conjunction with it. To this end, the operating rod 41 of the valve body 40 is connected to the interlocking operating member 42 as described above, and an operating finger 42a is provided continuously, and abuts on the upper end of the sliding portion 35a of the valve body 35. ing. Then, the operating finger 42
In a , a flow passage 45 through which the cleaning liquid flows while the valve body 35 is opened is formed.

The fluid supply device according to the present embodiment is configured as described above. However, when the valve operating section 21 is not operated, the hydraulic oil is not supplied to the hydraulic working chamber 44.
By the action of 43, the valve body 35 is seated on the valve seat 36, and the communication between the inner pipe 13a and the washing water outflow passage 16 is cut off.
Further, the valve body 40 is separated from the valve seat 39, and the outer pipe 13b and the air outflow passage 15 are in communication. However, the valve operating section 21
Since the air release port 25a formed in the operation button 24 is open, even if the air pump 10 is operated,
The air supplied from the air pump 10 is released to the atmosphere, no pressure is generated in the air supply pipe 12, and neither the cleaning water nor the air is ejected from the nozzle 8. Air pump 1
0 operates with no load.

When the air release port 25a of the operation button 24 constituting the valve operation section 21 is closed, the communication between the air supply pipe 12 and the atmosphere is cut off, and the pressure of the air supplied from the air pump 10 increases. As a result, the pressurized air from the air pump 10 is supplied to the air supply pipe 12, the first air passage 33, the outer pipe 13 b of the connection pipe 13, and the second air passage 3.
4, pressurized air is supplied to the air outflow path 15, and this pressurized air is supplied to the nozzle 8 through the fluid flow path 17,
The air supply state ejected from the nozzle 8 is set. In addition,
In this air supply state, the pressurized air is also supplied to the washing water tank 11, but the valve body 3 in the switching valve mechanism 14
Since the connection between the inner pipe 13a and the cleaning liquid pipe 19 is shut off by the operation of 5, the cleaning water is not supplied.

Next, when the operation button 24 of the valve operation section 21 is pushed in against the return spring 26, the pressure oil is supplied from the oil chamber 27 into the hydraulic operation chamber 44 via the hydraulic flow path 27 and the hydraulic pipe 28. Then, the interlocking operation member 42 is slid and displaced. As a result, the valve body 35 is seated on the valve seat 36 against the spring 37,
The valve body 40 is separated from the valve seat 39 against the spring 43, so that the space between the outer pipe 13b and the air outflow path 15 is shut off, and the connection between the inner pipe 13a and the washing water outflow path 16 is connected. That is, the air supply pipe 12 is connected to the outer pipe 13 b through the first air passage 33, and further, the sliding displacement of the piston 23 cuts off the connection between the atmosphere open path 20 and the atmosphere communication path 25. Then, a pressure is generated in the air supply pipe 12, and the liquid level of the cleaning water tank 11 is pressurized by the pressure, so that the cleaning water in the cleaning water tank 11 is supplied to the inner pipe 13a, the valve chamber 32, and the cleaning chamber. Wash water is ejected from the nozzle 8 through the water flow path 16 and the fluid flow path 17 in sequence, and the washing water is supplied. In this state, since the valve element 40 is seated on the valve seat 39, there is no possibility that pressurized air is supplied to the nozzle 8.

As described above, the valve operating section 21 is provided in the main body operating section 2, and by operating this valve operating section 21, the fluid supply device is opened to the atmosphere, the air supply state, and the cleaning water supply state. Since the two states can be switched, the convenience of the switching operation is maintained. Further, the main body operation section 2 is provided with a valve operation section 21 having a casing 22 having two ports of an open-to-atmosphere path 20 and a hydraulic flow path 28, and the switching valve mechanism 14 is connected to the connector 4 a of the light guide flexible section 4. Since it is mounted, the configuration of the fluid supply control mechanism provided in the main body operation unit 2 is extremely simplified, and the size and weight are reduced, which is extremely advantageous in reducing the size of the whole main body operation unit 2. In addition, the weight reduction of the main body operation unit 2 can reduce the burden on an operator or the like who performs the operation. In addition, the air outflow path 15 and the washing water flow path 16 which are in direct communication with the nozzle 8 pass through the valve operating section 21. Inside the endoscope 1, the fluid flow path 17 and the air outflow path 15 are provided.
In addition, since only the cleaning water flow path 16 is provided and does not have a complicated path such as a valve mechanism, the cleaning performance of the fluid flow path of the endoscope 1 is improved. Further, the switching valve mechanism 14 is provided on the connector 4a of the light guide flexible part 4, and since a long flow path is interposed between the nozzle 8 and the switching valve mechanism 14,
There is no risk that the switching valve mechanism 14 will be contaminated by body dirt or the like. Therefore, the switching valve mechanism 14 can be reused by simple washing.

FIG. 7 shows a second embodiment of the present invention . In this embodiment, a valve casing 71 is provided as a switching valve mechanism 70 mounted on the connector 4a of the light guide flexible portion 4. A spool valve 72 is slidably provided therein, and lands 72a, 72b and 72c are provided on the spool valve 72, and an air chamber 73 is provided between the lands 72a and 72b, and between the lands 72b and 72c. A washing water chamber 74 is formed. When the spool valve 72 is at the illustrated position, the air supply path 76 from the air pump 75 and the air outflow path 7 communicating with the nozzle 77 are provided.
8 communicate with each other through an air chamber 73, and
The washing water supply pipe 80 from the nozzle 9 and the washing water outflow passage 81 communicating with the nozzle 77 are at an air passage communicating position which is blocked by a land 72b. When the spool valve 72 slides from the illustrated position in the direction of the arrow and the land 72c is displaced to a position where the land 72c contacts the stepped portion 71a of the valve casing 71, the space between the air supply passage 76 and the air outflow passage 78 is established. The cleaning water supply pipe 80 and the cleaning water outflow passage 81 are cut off by the lands 72 a, and the cleaning water passage communicates with the cleaning water chamber 74 at a communication position.

Normally, the land 72a of the spool valve 72 is held at the air passage communicating position where the land 72a is in contact with the stepped portion 71a of the valve casing 71 by the action of the biasing force of the spring 82. Casing 71
When the pressurized air is supplied to the working chamber 83 formed between the cleaning chamber and the cleaning water passage, the working chamber 83 is switched to the washing water passage communicating position by the pressure. A valve operating section 85 for performing switching control in the switching valve mechanism 70 is provided in the main body operating section 2. The valve operating section 85 includes a valve member 87 slidably mounted on a casing 86 and an operation button 88 connected to the valve member 87. The operation button 88 can be operated by a finger. An air guide path 89 connected to an air pump 75 and a working air supply path 90 communicating with a working chamber 83 are connected to the casing 86. The valve member 87 is connected to the air guide path 89, the working air supply path 90, Exhibits the function of communicating and blocking between

Normally, the return air spring 91 acting on the valve member 87 causes the air guide passage 89 and the working air supply passage 90 to return.
In this state, the open air passage 9 formed from the valve member 87 toward the operation button 88 is closed.
2 and the air passage 89 communicate with each other.
Is opened at the upper end surface of the operation button 88 as an atmosphere opening port 92a. Then, when the operation button 88 is pressed down against the return spring 91, the air guide path 89 is opened to the atmosphere open path 9.
2, and communicates with the working air supply passage 90. As a result, pressurized air is supplied from the air guide passage 89 to the working chamber 82 via the working air supply passage 90, and the spool valve 72 is moved to the air passage communication position. From the washing water passage communication position. The air supply path 76 from the air pump 75 is always in communication with a portion of the washing water tank 79 above the liquid level.

This embodiment is constructed as described above, and the air sent from the air pump 75 to the air supply passage 76 is discharged from the air release passage 92 to the atmosphere unless the finger touches the operation button 88. It is kept open to the atmosphere, and no pressure is generated in the air supply path 76. Although the spool valve constituting the switching valve mechanism 70 is in the air passage communicating position, no pressure is generated in the air supply path 76, so that no pressurized air is supplied to the nozzle 77.

Next, when the air release port 92a formed on the operation button 88 is closed by a finger, pressure is generated in the air supply path 76, and pressurized air flows from the air supply path 76 to the air outflow path 78. The state is switched to the air supply state supplied to the nozzle 79 via the nozzle 79. Then, when the operation button 88 is depressed, the air guide passage 89 is cut off from the open air passage 92 and communicates with the working air supply passage 90. As a result, pressurized air supplied from the air pump 75 flows from the air guide passage 89 to the working air supply passage 9.
0 to the working chamber 83 in the valve casing 71, the spool valve 72 is switched to the washing water passage communicating position by this pressure, and the washing water supply pipe 80 is connected to the washing water chamber 7.
The washing water is supplied to the washing water outflow passage 81 via 4, and the washing water is jetted from the nozzle 77.

In each of the above-described embodiments, the fluid pressure is used as the switching signal of the switching valve mechanism by the valve operating section.
Although the valve element is configured to be switched by the action of the fluid pressure, the valve element in the switching valve mechanism is configured as an electromagnetic switching valve, the valve operating section is configured with switch means, and output from the switch means is provided. The solenoid of the electromagnetic switching valve may be configured to excite and demagnetize the solenoid of the electromagnetic switching valve by an electric signal to be transmitted. Also, a control cable is connected between the valve operating section and the valve body of the switching valve mechanism, and the control cable is pushed and pulled. By operating, it is also possible to configure so that the valve body is mechanically switched.

[0028]

The present invention is constructed as described above.
Switching operation is performed with the fingers of the hand holding the body operation unit
Convenience of operation is ensured, and the open air path is
After setting, the switching valve mechanism that controls the liquid sending state is operated by the main body
The main unit can be operated by providing
The body is lighter to reduce the burden on the surgeon,
Space saving inside the working area, and furthermore, easy cleaning of the flow path
And various other effects.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an endoscope.

FIG. 2 is an explanatory view showing a structure of a distal end face of an insertion portion of the endoscope.

FIG. 3 is a configuration explanatory view of a fluid supply device showing a first embodiment of the present invention.

FIG. 4 is a sectional view of a switching valve mechanism according to the first embodiment.

FIG. 5 is a sectional view of the switching valve mechanism showing an operation state different from that of FIG. 4;

FIG. 6 is an explanatory diagram of a configuration of a fluid passage at a position along line XX in FIG. 4;

FIG. 7 is an explanatory diagram of a configuration of a fluid supply device according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Endoscope 2 Main body operation part 3 Insertion part 4 Light guide flexible part 4a Connector 8 Nozzle 10,75 Air pump 11,79 Wash water tank 12,76 Air supply pipe 13 Connection piping 14,14 ', 70 Switching valve mechanism 15 Air Outflow path 16 Washing water outflow path 20, 92 Open air path 21, 85 Valve operation unit 23 Piston 24, 88 Operation button 27 Hydraulic flow path 29 Hydraulic piping 32 Valve chamber 35, 40 Valve body 42 Interlocking operation member

Claims (6)

(57) [Claims] 1. A nozzle provided at a distal end of an insertion portion of an endoscope.
And one end is connected to the nozzle, and the other end is
A air flow path connected to the
Liquid flow connected to a liquid supply tank where the liquid level is more pressurized
A passage, a valve operating part provided in the main body operating part of the endoscope, and a light source connecting part of the endoscope or the liquid supply terminal therefrom.
A switching valve mechanism provided at a position on the ink side, wherein the valve operating section is connected to the pressurized air supply source, the liquid flow path is provided via the switching valve mechanism, and the valve operation is performed.
Connected to the liquid supply tank without any intervening section, and the valve operating section communicates the pressurized air supply source with the atmosphere.
Air communication passage, and this air communication passage is opened manually.
The valve can be closed, and the switching operation is performed by using the pushing operation of the valve operation unit as a switching signal.
A valve mechanism communicates between the liquid supply tank and the nozzle
A fluid supply device for an endoscope, wherein the fluid supply device is configured to be switched so as to make the fluid supply. 2. The air flow path and the liquid flow path, respectively.
The pressurized air supply source via the switching valve mechanism.
And the air supply passage connected to the liquid supply tank.
Communicates with a passage branched from the air flow path, and
The liquid supply tank and the nozzle are linked by a valve changing mechanism.
When the air is passed, the switching valve mechanism supplies the pressurized air.
The source is disconnected from the valve operating section and the liquid supply is
The supply tank is pressurized with air.
The fluid supply device for an endoscope according to claim 1 . 3. The switching valve mechanism according to claim 1 , wherein
A valve body that communicates and shuts off between the supply tank and the nozzle
The valve element is always provided with the liquid supply tank.
Block between the nozzle and the nozzle, and disconnect from the valve operating section.
When a change signal is supplied, the liquid supply tank and the nozzle
And the communication between the
The fluid supply device for an endoscope according to claim 1 or 2 . 4. The valve body is of a fluid pressure type,
The switching valve mechanism changes the fluid pressure by the pushing operation of the valve operating section.
Configured to be applied to the valve body and the possible endoscopic fluid supply device of the 請 Motomeko 3 wherein you said. Wherein said valve body is of electromagnetically actuated, the valve operating portion comprises a switch means, you characterized in that it is configured to supply a driving signal to the valve body from the switching means 請 The fluid supply device for an endoscope according to claim 3. 6. The valve body is of a mechanically operated type, and the valve operating portion is connected to the valve body and includes displacement transmitting means for transmitting a displacement of the valve operating portion to the valve body. fluid supply device of the endoscope 請 Motomeko 3 wherein said.