JPH045133Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an endoscope suction line switching device that is inserted into the endoscope's suction line and switches the suction line. .

[Prior Art] A suction line switching device for this type of endoscope is generally composed of a cylinder body and a piston body for switching the line that is provided in the cylinder body so as to be able to move forward and backward, and in a standby state, the suction line switching device and It communicates with the outside air and sucks only the outside air, and during a suction operation, the suction device and the suction port at the tip of the insertion portion communicate with each other and suction is drawn from the suction port. Conventionally, such a suction pipe switching device, as shown in Japanese Patent Laid-Open No. 58-15834, has a communication path formed by cutting out the outer circumferential surface of the piston body, which is the fitting surface with the cylinder body. The communication passages were cut off from each other by the fitting surfaces of the cylinder body and the piston body.

[Problems to be Solved by the Invention] In this type of suction line switching device, in a standby state, the suction device sucks outside air through the suction line switching device. However, as mentioned above, in the conventional suction line switching device, the boundary between the communication passages formed in the piston body was shut off at the fitting part between the cylinder body and the piston body, so the shutoff was completely prevented. I couldn't do it. Therefore,
Even in the standby state, a small amount of suction is performed from the tip of the insertion tube through the gap in the fitting section, and the air in the body cavity gradually escapes during observation, resulting in a gap between the observation window at the tip of the insertion tube and the area to be observed. The disadvantage was that the distance between the two lenses changed, making it impossible to maintain good observation conditions.

Furthermore, when attempting to shorten the length of the device in order to improve operability, there was a drawback that the structure resulted in a structure in which outside air was sucked in during the suction operation, making it impossible to perform sufficient suction from within the body cavity.

This device eliminates such conventional drawbacks and prevents suction leakage from the tip of the insertion tube in the standby state.It is also easy to operate and ensures reliable suction from inside the body cavity without drawing in outside air during suction operation. An object of the present invention is to provide a suction line switching device for an endoscope that can perform the following steps.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the endoscope suction line switching device according to the present invention has the following features: a first pipe line connected to the suction device; A second pipe line that communicates with the suction port that opens at The first, second, and third conduits are open-connected to a cylinder body disposed in the operating section, and the first pipe is inserted into the piston body, which is fitted into the cylinder body so as to be freely retractable. and a second communication path that communicates the first and second pipelines at a position where the piston body is pushed into the cylinder body during a suction operation. and, when the piston body is provided with an inter-pipe sealing means for blocking between the first communication passage, the second communication passage and the second pipeline, and when the piston body is pushed into the cylinder body. 3rd above
The invention is characterized in that the third pipe line is provided with an outside air sealing means for sealing between the pipe line and the outside air.

[Operation] In the standby state, the first and third pipes communicate with each other via the first communication path, and outside air is sucked into the suction device. Since the first communication path, the second communication path, and the second pipe line are cut off by the inter-pipe sealing means, in this standby state, the first and second pipe lines The space between the suction ports is completely shut off, and no suction is performed from the suction port at the tip of the insertion tube.

Furthermore, during a suction operation, by pushing the piston body into the cylinder body, the first and second pipes communicate with each other via the second communication path, and suction is performed from the suction port at the tip of the insertion portion. Then, the space between the third pipe line and the outside air is sealed by the outside air sealing means so that outside air is not sucked in.

[Embodiment] An embodiment of the present invention will be described based on FIGS. 1 to 4.

FIG. 3 shows an endoscope equipped with the device of this embodiment, in which 1 is an insertion section, 2 is an operating section, 3 is a suction line switching device disposed in the operating section, and 4 is an endoscope equipped with the device of this embodiment.
is a connecting pipe (first pipe line) that communicates with the suction pipe switching device 3 and is connected to the external suction device 5;
Reference numeral 6 denotes a tube (second pipe line) connected from the suction line switching device 3 to the suction port 7 that opens at the distal end of the insertion section. 8 and 9 are a known forceps insertion port and an air/water supply switching device, respectively.

FIG. 1 is a plan sectional view of the suction pipe switching device 3, and FIG. 2 is a sectional view taken along the line 2-2. In the figure,
10 is a cylinder body fixed to the operating section 2;
This cylinder body 10 includes an outer cylinder body 10a fixed to the operating part 2 with a nut 11, an intermediate cylinder body 10b and an inner cylinder body 10 that are sequentially attached therein and integrally formed with each other by welding or the like.
The inner diameter of each of these cylinder bodies is the same size and coaxially formed. Further, a cover 12 is arranged to cover the tip of the cylinder body 10.
is screwed and fixed to the outer periphery of the tip of the outer cylinder body 10a. 13... is an O-ring for sealing.
The bottom of the cylinder body 10 is connected to the second conduit 6 that communicates with the suction port 7 at the tip of the insertion section, and the body of the cylinder body 10 is connected to the first conduit 6 that is connected to the suction device 5. The pipe lines 4 are connected to each other and communicate with the inside of the cylinder body 10. Further, a window 14 communicating with the outside air is bored in the cover 12, and a third conduit 15 is formed between the intermediate and inner cylinder bodies 10b and 10c in communication with the window 14. The third pipe line 15 communicates with the inside of the cylinder body 10 at a position facing the first pipe line 4.

A piston body 16 is loosely inserted into the cylinder body 10 so as to be freely retractable. A finger pad 17 is provided at the tip of the tip to be pressed by the fingertip during suction operation.
is screwed and fixed, and its finger rest body 17 and cover 12
The piston body 16 is always urged in the direction in which it comes out of the cylinder body 10 (to the left in FIG. 1) by a coil spring 18 installed between the piston body 16 and the cylinder body 10.
Furthermore, since the step 16a formed on the piston body 16 is formed so as to come into contact with the cover 12, the piston body 16 does not come out of the cylinder body 10 and is normally in the position shown in FIG.

A communication groove (first communication path) 19 is provided on the outer periphery of the piston body 16 so as to communicate with the openings in the cylinder body 10 of the first and third conduits 4 and 15 in this standby state. The outside air flows from the window 14 to the third pipe line 15 to the first communication passage 19.
→It is sucked into the suction device 5 through the first conduit 4.

Further, as shown in FIG. 4, the finger rest body 17
When the piston body 16 is pushed fully into the cylinder body 10 by pressing , the bottom of the finger rest 17 comes into contact with the O-ring 20 attached to the bottom of the cover 12, and the space between the outside air and the window 14 is closed. On the other hand, the piston body 16 has a communication hole (second communication path) 21 that communicates the first and second pipes 4 and 6 in this state.
is formed. The communication between the first and second conduits 4 and 6 in this manner is the so-called suction operation state, and as shown in FIG. 4, the second conduit 6 → Second communication path 21 → first
Suction is applied to the suction device 5 through the conduit 4 .

A circumferential groove is formed on both sides of the first communication path 19 on the outer circumference of the piston body 16, and an O-ring (sealing means) 22 is installed in the groove.
An O-ring 23 is also placed on the outside of the opening of the second communication path 21.
is installed. These O-rings 22, 23
is formed of an elastic body such as silicone rubber, and is compressed and deformed between the cylinder body 10 and the piston body 16 and attached thereto. Therefore, even if high pressure or negative pressure is applied, the fitting surface between the cylinder body 10 and the piston body 16 is completely closed, and the O
The ring (sealing means) 22 blocks the first communication path 19 and the second communication path 21 and the second pipe line 6, and the O-ring 23 blocks the connection between the second communication path 21 and the outside air. It's blocked. 24 is a key groove formed linearly in the axial direction on the circumference of the piston body 16; 25;
is a rotation stopping pin that is provided to protrude from the cylinder body 10 into its keyway 24 and restricts the rotation of the piston body 16.

According to the above-described embodiment configured in this way, in the standby state shown in FIG. Both sides are closed by sealing means 22, and are completely cut off from the second communicating path 21 leading to the suction port 7 at the tip of the insertion section.
Therefore, no suction is performed from the suction port 7.

Furthermore, during the suction operation shown in FIG. Suction is performed from the suction port 7 through communication, and an O-ring 23 seals between the second communication path 21 and the outside air, and an O-ring 20 also seals between the third pipe line 15 and the outside air. It is completely cut off from the outside air, so no outside air is sucked in, and strong suction is performed from the suction port 7 at the tip of the insertion section.

[Effects of the invention] According to the endoscope suction line switching device of this invention, the first communication path and the second communication path and the second communication path and the second pipe line are cut off. Since the inter-pipe sealing means is provided, in the standby state, the suction port at the tip of the insertion tube and the suction device are completely cut off, preventing suction leakage from the suction port, and therefore, no leakage occurs within the body cavity. It has an excellent effect of keeping an appropriate amount of air and stably maintaining good observation conditions.

In addition, since the first and third pipes are opened at the same position in the axial direction of the cylinder body, the device can be made short and excellent operability can be obtained. Moreover, during suction operation, the third pipe Since the space between the channel and the outside air is sealed by the outside air sealing means, sufficient suction is performed from the suction port at the tip of the insertion tube without suctioning the outside air, and the structure for arranging the outside air sealing means is is easy and sealing is reliable.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of an embodiment of the present invention in a standby state, FIG. 2 is a cross-sectional view taken along the line 2, and FIG. 3 is a side view of an endoscope equipped with the suction line switching device of the embodiment. , FIG. 4 is a plan cross-sectional view during the suction operation of the embodiment. 2... Operation unit, 3... Suction pipe switching device, 4...
...First pipe line, 5... Suction device, 6... Second pipe line, 7... Suction port, 10... Cylinder body, 14...
... window, 15 ... third pipe line, 16 ... piston body, 19 ... first communication path, 21 ... second communication path, 22 ... sealing means.

Claims (1)

[Claims for Utility Model Registration] 1. A first pipe line connected to a suction device, a second pipe line communicating with a suction port opened at the tip of the insertion section, and a third pipe line communicating with outside air. Of these, the first
and a third pipe line are opened at equal positions in the axial direction of the cylinder body, and the first, second, and third pipe lines are open-connected to the cylinder body disposed in the operating section, and the pipe line is opened in the cylinder body. A piston body inserted into the piston body so as to be freely advanced and retractable is provided with a first communication path that communicates the first and third conduits when the piston body is in a standby position, and the piston body is pushed into the cylinder body during a suction operation. A second communication path that communicates the first and second pipes at a position is formed between the pipes, and the first communication path and the second communication path and the second pipe are separated from each other. A sealing means is provided on the piston body, and an outside air sealing means is provided on the third conduit for sealing between the third conduit and outside air when the piston body is pushed into the cylinder body. Characteristic endoscope suction line switching device. 2. The endoscope according to claim 1, wherein the inter-pipe sealing means is an elastic body that is compressively deformed and attached to the fitting portion between the cylinder body and the piston body. Suction pipe switching device.