JPS645893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a suction switching valve for an endoscope.

Recently, a method of treating an affected area within the body and vagina using an endoscope has become popular.
When performing this laser treatment, gas is continuously sent into the body cavity through the endoscope, so it is dangerous if the gas is not continuously sucked and exhausted at the same time.

However, as shown in Japanese Utility Model Publication No. 48-10704, conventional suction switching valves for endoscopes generally consist of a cylinder and a piston, and suction is achieved by pushing the piston against an urging force. It's getting old. Therefore, in order to continue suction, it was necessary to continue pushing the piston against the urging force. For this reason, the operator was forced to perform the suction operation, was easily fatigued, and had poor operability.

The present invention has been made focusing on the above circumstances,
The purpose is to provide a suction switching valve for an endoscope that can be fixed in a suction state and continue suctioning with a simple operation, has good operability, and is safe for the patient.

Hereinafter, each embodiment of the present invention will be described based on the drawings.

1 to 4 show a first embodiment of the present invention. Reference numeral 1 in FIG. 1 is an endoscope main body, and this endoscope main body 1 consists of an operating section 2 and an insertion section 3, and a cable 4 is led out from the operating section 2. Further, the endoscope main body 1 incorporates components necessary for an endoscope, such as a light guide, an image guide, and air/water supply pipes. Further, a suction conduit 5 is inserted into the endoscope main body 1 and extends over the insertion section 3, the operation section 2, and the cable 4. The proximal end side of the suction pipe line 5 is connected to a liquid storage container 6, and a suction pump 8 is connected to the liquid storage container 6 via a connecting pipe 7.

The operating section 2 is provided with a suction switching valve 9 inserted in the middle of the suction conduit 5. This suction switching valve 9 has a piston 11 slidably inserted into a bottomed cylindrical cylinder 10, and a lid body 13 having a port 12 is detachably attached to the open end of the cylinder 10. . The piston 11 is integrally provided with an operating rod 14 that penetrates through the opening 12 of the lid 13 and projects to the outside. A collar 15 is provided at the protruding tip of the operating rod 14. Also, this saliva 1
A coil spring 16 as a biasing member is interposed between the coil spring 5 and the lid body 13 so as to be wound around the operating rod 14 . This coil spring 16 is connected to the piston 1
1 is urged outward, and is made to stand by at an outer position where it hits the lid 13. Ring-shaped packings 17 and 18 are fixed to opposing surfaces of the lid 13 and the collar 15, respectively. Therefore, at the pushing position of the piston 11, the packing 1
7 and 18 are joined to each other to form a leak hole 19 which will be described later.
It constitutes a closing means for closing the opening to the outside. The piston 11 is formed with a leak hole 19 that opens into the bottom space inside the cylinder 10, and this leak hole 19 has a horizontal hole 20 that penetrates the operating rod 14.
It communicates with the outside via. Furthermore, the piston 11 is connected to the leak hole 19, and
A suction port 21 that opens on the circumferential surface of the piston 11 is formed. This suction port 21 is closed by the inner wall surface of the cylinder 10 when the piston 11 is in a standby state. Further, a guide groove 22 is formed on the circumferential surface of the piston 11 along the direction of movement thereof. A guide pin 23 protruding from the inner surface of the cylinder 10 is fitted into the guide groove 22 so that the piston 11 is moved linearly without rotating.

Furthermore, as shown in FIG. 2, a locking groove 24 is continuously formed in the upper end of the guide groove 22 along the lateral direction, and when the piston 11 is rotated at the position where the piston 11 is pushed in, the guide pin can be rotated. 23 into the locking groove 24 to constitute a locking means for locking the piston 11 in the pushed-in state. On the other hand, the inflow port 25 of the cylinder 10 is formed to correspond to the location where the suction port 21 is located when the piston 11 is pushed in. Note that the suction port 21 is also connected to the inlet port 2 when the guide pin 23 is fitted into the locking groove 24 and locked as shown in FIG.
It is formed in the shape of a horizontally elongated hole so as to continue communicating with 5. Further, the outlet 26 of the cylinder 10 is formed at the bottom of the cylinder 10. The inlet 25 is connected to the upstream side of the suction pipe 5, and the outlet 26 is connected to the downstream side of the suction pipe 5.

Next, the operation of the suction switching valve 9 in the above embodiment will be explained.

First, as shown in FIG. 3, in a standby state in which the suction switching valve 9 is not operated, the suction port 21 of the piston 11 is closed by the inner wall surface of the cylinder 10, and the inlet port 25 is closed on the outer circumference of the piston 11. occluded by a surface. On the other hand, the outlet 26 is connected to the bottom space of the cylinder 10, the leak hole 19, and the side hole 2.
0, respectively, to the outside. Therefore, the suction action of the suction pump 8 only suctions the outside air through them, and no suction is performed from the distal end side of the insertion section 3.

Next, when suctioning dirt and mucus inside the body and vagina, the piston 11 is pushed into the cylinder 10 by pressing the collar 15 with a finger, as shown in FIG. Since the suction port 21 of the piston 11 faces and communicates with the inflow port 25, the inflow port 25 and the outflow port 26 communicate with each other through the leak hole 19 and the bottom space of the cylinder 10.
communicate with each other, so the suction conduit 5 is open over its entire length. Further, the packings 17 and 18 of the lid body 13 and the brim 15 are joined to each other to block the leak hole 19 from the outside and close it. Therefore, the suction force acts only on the suction conduit 5, and dirt, mucus, etc. in the body vagina can be suctioned from the distal end of the insertion section 3. In addition, the suctioned dirt and mucus should be stored in the liquid storage container 6.
and does not flow into the suction pump 8 side.
After that, if you release your finger from the collar 15, the coil spring 1
It is automatically restored by the urging force of 6 and returns to the standby position shown in FIG.

On the other hand, when a laser treatment device is introduced into the body cavity using an endoscope and the laser beam is irradiated to the affected area for treatment, continuous suction is required, such as when sending a large amount of gas into the body vagina. , operate as follows. That is, in the same manner as above, the piston 11 is pushed in by placing a finger on the collar 15, and at the end of the push-in, the piston 11 is rotated and the guide pin 2 is inserted into the locking groove 24.
It is locked by fitting 3. Thus, the piston 11 is held in that position and can continue to draw suction to ensure the suction state.
In addition, to release this, after rotating the piston 11 in the opposite direction to bring it into the exact same state as shown in FIG. Return to the state shown in Figure 3.

5 to 7 show a second embodiment of the present invention. Suction switching valve 30 of this embodiment
As in the previous embodiment, a piston 11 is slidably inserted into a cylinder 10 having an inlet 25 and an outlet 26, and a lid 13 having a passage 12 is provided at the open end of the cylinder 10. installed. The piston 11 is integrally provided with an operating rod 14. The piston 11 and the operating rod 14 are provided with a leak hole 31 that penetrates in the axial direction over the entire length thereof.
is formed. Furthermore, a cylindrical collar 33 having a ventilation hole 32 in the center is attached to the outer end of the operating rod 14. Further, a coil spring 16 as a biasing member is wound around the outer periphery of the operating rod 14, interposed between the lid body 13 and the collar 33. Further, a check valve 34 is provided at the outer end opening portion of the leak hole 31 to open and close the vent hole 32, and as will be described later, when the piston 11 is in the pushed-in position, the leak hole 34
1 constitutes a closing means for blocking the opening to the outside. That is, as shown in FIG. 7, the check valve 34 is a disk-shaped plate body 3 made of a flexible material, such as synthetic resin.
5, an annular groove 36 with a larger diameter is formed by the ventilation hole 32.
It is formed by cutting out a portion of the hole so that it can be joined to the periphery of the ventilation hole 32. When the inside of the leak 31 becomes negative pressure, it opens to open the vent hole 32. Furthermore, a hollow valve holder 37 is disposed concentrically within the cylinder 10 and is integrally attached and fixed to the bottom wall of the cylinder 10. This valve holder 37 pushes the check valve 34 and closes the vent hole 32 when the piston 11 is pushed in. Further, a hole 38 that opens into the bottom space of the cylinder 10 is formed at the bottom of the valve holder 37 . Further, a communication hole 39 is formed in the valve holder 37 so as to face the inflow port 25, so that when the piston 11 is pushed in, it corresponds to and communicates with the suction port 21. In addition, in the case of this embodiment, as in the above embodiment, a guide groove 22 and a locking groove 24 are formed in the piston 11, and a guide pin 23 is provided on the cylinder 10 side.

Therefore, in this embodiment, in the standby state shown in FIG.
are each closed by a piston 11. On the other hand, the outflow port 26 communicates with the outside via the bottom space of the cylinder 10, the hole 38, the hollow part 37a of the valve holder 37, the leak hole 31, the open check valve 34, and the vent hole 32. Only outside air is sucked by the suction action, and suction is not performed from the distal end side of the insertion section 3.

When suctioning dirt and mucus within the body cavity, the piston 11 is pushed into the cylinder 10 by pressing the collar 33 with a finger, as shown in FIG. However,
The suction hole 21 and the communication hole 39 are aligned with the inflow port 25 so that the inflow port 25 communicates with the outflow port 26 .
Further, the valve holder 37 pushes up the check valve 34 and closes the vent hole 32. That is, the suction conduit 5 is cut off from communicating with the outside, and the suction conduit 5 is opened over its entire length. Therefore, the suction force of the suction pump 8 acts only on the suction conduit 5, making it possible to suction dirt, mucus, etc. inside the body and vagina. Furthermore, after this,
When the finger is released from the collar 33, the state shown in FIG. 5 is automatically restored as in the previous embodiment.

On the other hand, if it is desired to continue the suction operation, the piston 11 is pushed in to the state shown in FIG. 6 in the same manner as described above, and then the piston 11 is rotated to fit the guide pin 23 into the locking groove 24 and lock it. However, piston 1
1 is held in its suction position and can continue suctioning. To release this, the piston 11 is rotated in the opposite direction to return to the state shown in FIG. 6, and when the finger is released, the state shown in FIG. 5 is automatically returned.

8 to 10 show a third embodiment of the present invention. This embodiment has almost the same structure as the first embodiment, but the guide means and locking means for the piston 11 are different. In addition, the same reference numerals are given to the parts having the same structure, and the explanation thereof will be omitted. That is, in this third embodiment, a rotating pin 41 is provided on the inner surface of the lid body 13 facing the operating rod 14, and a first rotating pin 41 is provided on the circumferential surface of the operating rod 14 opposite to this rotating pin 41.
A locking guide groove 42 as shown in Figure 0 is formed. The pivot pin 41 has one end pivotally attached to the lid body 13 and extends downward along the axial direction of the operating rod 14, and a locking end 43 consisting of the extending tip.
is bent and protrudes toward the locking guide groove 42 of the operating rod 14, and is inserted into the locking guide groove 42. Furthermore, the locking end 43 is urged to elastically protrude toward the locking guide groove 42 by the elasticity of the pivot pin 41 itself. Therefore, the locking end 43
always slides along the bottom surface of the locking guide groove 42.
In addition, the locking guide groove 42 forms a loop symmetrically as shown in FIG. are formed sequentially.
The rear end 45b of the drop guide groove 45 is formed deeper than the tip 44a of the moving groove 44, and the drop portion 46 is deeper than the tip 45a of the drop guide groove 45.
is more deeply formed. Further, the rear end 47b of the return groove 47 is formed deeper than the depressed portion 46. Furthermore, the tip 4 of the return groove 47
A rear end (base end) 44b of the moving groove 44 is formed deeper than 7a. The moving groove 44 and the falling guide groove 45 are arranged in opposite directions, as shown in FIG. There is. The locking end 43 of the rotation pin 41 is configured to fall into either the rear end 44b of the moving groove 44 or the depressed portion 46 and to be locked therein.

Next, the operation of this third embodiment will be explained. The locking end 43 of the rotation pin 41 in the normal standby position
is locked to the rear end 44b of the moving groove 44. Therefore, first, a normal suction operation for temporary suction is performed by lightly pushing the operation rod 14 of the piston 11. That is, when the piston 11 is pushed in, the packings 17 and 18 join together to close the leak hole 19, and are in the position corresponding to the above-mentioned FIG. . In addition, in this pushed-in position, the locking end 43 of the rotation pin 41 is inserted into the movement groove 44.
However, it does not reach the drop guide groove 45 and stops in the middle of the movement groove 44. Therefore, when the finger is released from the operating rod 14 of the piston 11, the piston 11 returns to the rear end 44b of the moving groove 44 and is locked thereto, thereby regulating the standby position of the piston 11.

Next, if continuous suction is desired, the packings 17 and 18 are pushed in even more forcefully from the pushing position against their elasticity. As a result, the locking end 43 of the rotation pin 41 climbs over the tip 44a of the moving groove 44 and falls into the falling guide groove 45, and cannot return to the moving groove 44. Therefore, the operation lever 1 of the piston 11
4, as the piston 11 returns to its upward position, the locking end 43 of the pivot pin 41 is guided to the falling part 46 along the falling guide groove 45, as shown in FIG. It falls into the depressed portion 46 and is locked. As a result, the piston 11 is held in the pushed-in state as shown in FIG. In other words, the suction state is maintained.

Moreover, when canceling this continuous suction state, the piston 11 is similarly pushed strongly against the elastic force of the packings 17 and 18. However, the rotation pin 41
The locking end 43 immediately falls into the return groove 47,
The engagement with the depressed portion 46 is released. Then, when you release your finger, the piston 11 returns due to its biasing force, so as the piston 11 returns, the locking end 43 of the pivot pin 41 returns along the return groove 47, and the rear end of the moving groove 44 44b and returns to the original standby state.

As explained above, since the suction switching valve of the present invention is provided with a releasable locking means that fixes the piston in the suction state with a simple operation, suction can be performed continuously even if the hand is released. Therefore, there is no fatigue for the operator when performing the operation continuously, and there is no need to take care of the operator. In other words, the operability can be greatly improved. Furthermore, since continuous suction can be performed easily and reliably, there is no need to worry about excessive air supply into the patient's body, and the device can be used with peace of mind, and its safety can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the entire endoscope showing a first embodiment of the present invention, FIG. 2 is a perspective view of a piston in the same embodiment, and FIG. 3 is a sectional view of a suction switching valve in the same embodiment. Fig. 4 is a sectional view of the suction switching valve in operation in the same embodiment, Fig. 5 is a sectional view of the suction switching valve in the second embodiment of the present invention, and Fig. 6 is a sectional view of the suction switching valve in operation in the same embodiment. 7 is a bottom view of the valve body in the suction switching valve of the same embodiment, FIG. 8 is a sectional view of the suction switching valve in the third embodiment of the present invention, and FIG. 9 is the same implementation. FIG. 10, which is a sectional view during operation in the example, is a developed view of the locking guide groove in the same example. DESCRIPTION OF SYMBOLS 1... Endoscope main body, 5... Suction pipe line, 8... Suction pump, 9... Suction switching valve, 10... Cylinder, 11...
Piston, 14... Operating rod, 17... Packing, 1
8... Packing, 19... Leak hole, 21... Suction port, 22... Guide groove, 23... Guide pin, 24... Locking groove, 25... Inflow port, 26... Outlet port, 30... Suction switching valve, 31... Leak hole , 34... check valve, 37...
Valve holder, 41... Rotating pin, 42... Locking guide groove, 4
3... Locking end, 44... Moving groove, 45... Falling guide groove, 46... Falling portion, 47... Return groove.

Claims (1)

[Scope of Claims] 1. A cylinder that is inserted in the middle of a suction pipe and has an inlet that communicates with the upstream side of the suction pipe and an outlet that communicates with the downstream side of the suction pipe; and this cylinder. It has a leak hole that is slidably inserted into the hole and communicates with the outside, closes the inlet side in the outward waiting position, communicates the outlet with the leak hole, and connects the inlet and outlet in the pushed position. A piston configured to communicate with each other, a biasing member that biases the piston toward a standby position, a releasable locking means that can lock the piston in the pushed-in position, and a releasable locking means that locks the piston in the pushed-in position. 1. A suction switching valve for an endoscope, comprising a closing means for blocking an opening of a leak hole to the outside.