JPH08280607A - Pipeline switch gear for endoscope - Google Patents

Abstract

PURPOSE: To facilitate washing after use by simplifying a structure in a pipeline switch gear of an endoscope in which a piston body is rested at a specified intermediate part in a range of advancing or retraction thereof to let a fluid pipeline take one of a plurality of connection positions. CONSTITUTION: An energizing means 50 by which a piston body 15 operated to be forced into a cylinder body 10 is energized in the direction of pulling it out of the inside of the cylinder 10 is formed into a cylinder with elastic rubber or resin, and a weakly elastic part 50a which is squeezed initially when compressed axially and a strongly elastic part 50b with the elasticity thereof higher than that of the weakly elastic part 50a are formed integral on the energizing means 50 cylindrical so that the piston body 15 is positioned at an intermediate part when the weakly elastic part 50a is squeezed completely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope conduit switching device for switching the connection state of fluid conduits in an endoscope.

[0002]

2. Description of the Related Art Generally, a pipe line switching device for an endoscope is constructed by arranging a piston body in a cylinder body to which a fluid pipe line is connected so as to be able to advance and retreat in the axial direction. When the piston body is pushed into the cylinder body as much as possible, the connection state of the fluid pipeline is switched.

In such an endoscope duct switching device, a compression coil spring is attached to urge a piston body pushed into a cylinder body in a direction to pull it out of the cylinder body.

Further, in a more versatile endoscope conduit switching device, the fluid conduit is brought into one of a plurality of connected states by stopping the piston body at a predetermined intermediate portion of the advance / retreat range. There is one that I tried to become.

In such an endoscope pipe line switching device, compression coil springs are mounted in two stages, and the piston body is made stationary at an intermediate position where the spring force of the second stage spring begins to act. I am able to do it.

[0006]

However, if the coil springs are mounted in two stages as described above, the structure becomes complicated, so that cleaning and disinfection after use is not easy, and the parts cost and the assembly cost increase. .

Therefore, the present invention provides a structure for a conduit switching device for an endoscope in which the fluid conduit is brought into one of a plurality of connected states by stopping the piston body at a predetermined intermediate portion in the advance / retreat range. It is an object of the present invention to provide a conduit switching device for an endoscope that is simple and easy to clean after use.

[0008]

In order to achieve the above object, a conduit switching device for an endoscope of the present invention is a cylinder body to which the fluid conduit is connected for switching the connection state of the fluid conduit. Arrange the piston body in the axial direction so that it can move back and forth,
In a conduit switching device for an endoscope in which the fluid conduit is brought into one of a plurality of connected states by stopping the piston body at a predetermined intermediate portion of the advance / retreat range, it is pushed into the cylinder body. The urging means for urging the piston body in the direction of pulling out from the cylinder body is formed of a resilient rubber or plastic into a tubular shape, and the tubular urging means compresses in the axial direction. When a weak shot part that is crushed first and a strong shot part that is more elastic than the weak shot part are integrally formed, and when the weak shot part becomes completely crushed, the above It is characterized in that the position of the piston body is located at the predetermined intermediate portion.

The urging means may be detachable from the cylinder body and the piston body.

[0010]

Embodiments will be described with reference to the drawings. FIG. 2 shows the tip of the insertion portion of the endoscope, where 1 is the tip,
Reference numeral 2 indicates an observation window, and 3 indicates an observation visual field. Reference numeral 4 denotes a nozzle that opens toward the surface of the observation window 2, and an air supply pipe 5 to which air is sent and a water supply pipe 6 to which water is sent are connected to the nozzle 4 so as to communicate with each other. Reference numeral 7 denotes a jet nozzle that opens toward the observation direction and jets water, and a water jet pipe 8 for jetting water is connected to the jet nozzle.

FIG. 1 shows an operation valve provided in an operation section of an endoscope for switching a conduit. Reference numeral 9 denotes an outer wall of the operation portion, and a cylinder 10 is screwed and fixed inside the outer wall. Reference numerals 12 and 13 denote an air supply pipe and a water supply pipe connected to an external air supply / water supply device (not shown), and the cylinder 1
At 0, air is constantly sent from the air supply pipe 12 and water is sent from the water supply pipe 13.

Reference numerals 5, 6 and 8 are the air supply pipe, the water supply pipe and the water supply pipe for injection shown in FIG. 2, and these pipes pass through the inside of the insertion portion, and each end portion is on the cylinder 10 side. Connected to the department. Reference numeral 14 denotes a bottom lid that seals the bottom of the cylinder 10.

A piston 15 is inserted in the cylinder 10 so as to be movable back and forth. Four O's on the outer circumference of the piston 15
The rings 16, 17, 18, and 19 are mounted at intervals, and two communication grooves 20 and 21 are formed in the outer peripheral portion between them. In addition, a vent hole 22 penetrating the piston 15 is formed in the shaft portion of the piston 15.

The head of the piston 15 projects outward from the mouth of the cylinder 10, and an operation button body 50 formed of elastic or elastic rubber or plastic is attached to the projection. Has been.

The tip of the operation button body 50 is located at the piston 1
5 detachably engages with a flange-shaped portion 15a protrudingly provided on the projecting end of the cylinder 5, and the base portion of the operation button body 50 detachably engages with a flange-shaped portion 10a projecting at the mouth of the cylinder 10. Urging means for urging the piston 15 from the cylinder 10 in the pulling direction.

The operation button body 50 is formed into a hollow cylindrical body having a substantially 8-shaped cross section, and the wall thickness of the head side portion 50a attached to the piston 15 is the base side portion. The head side portion 5 is formed to be thinner than 50b.
The elasticity of 0a is weaker than that of the base portion 50b. 51 is a hole for ventilation.

Therefore, the piston 15 is connected to the cylinder 10
When the operation button body 50 is pushed with a fingertip in the direction of pushing inward, the head side portion 50a having weak elasticity is crushed and the head side portion 50a is completely crushed as shown in FIG. Then, when the operation button body 50 is further pressed, as shown in FIG. 4, the strongly elastic base portion 50b is crushed.

When the pushing force of the fingertip is released, the elastic force of the operation button body 50 first restores the base portion 50b as shown in FIG. 3, and then the head portion as shown in FIG. The part 50a is restored.

On the inner surface of the hollow operation button body 50, stoppers 53, 54, 54 are provided at both upper and lower ends and an intermediate portion, respectively.
55 is formed, and in the center of the head portion of the operation button body 50, a leak hole 52 that is continuous with the vent hole 22 and opens to the outside atmosphere is formed.

The endoscope line switching device thus formed has the operation button body 50 in the standby state shown in FIG.
The piston 15 urged outward by the abutment contacts the stopper 54 at the lower end of the operation button body 50 so that the air supply pipe 12 and the air supply pipe 5 communicate with each other.

Therefore, if the leak hole 52 is closed with a fingertip, air is sent into the air supply pipe 5 to be in an air supply state. In the state where the leak hole 52 is opened as shown in FIG.
The air sent from the air supply pipe 12 is discharged into the external atmosphere from the leak hole 52.

As shown in FIG. 3, the leak hole 52 is closed and the operation button body 50 is pushed in.
When only a is completely crushed, the upper ends and the intermediate stoppers 53 and 55 come into contact with each other, and the water supply pipe 1 passes through the communication groove 20.
3 and the water pipe 6 communicate with each other, and water is sent to the water pipe 6,
Water will be sent.

Then, as shown in FIG. 4, when the entire operation button body 50 is further pushed in and the base portion 50b is also completely crushed, the stoppers 53 at the upper and lower ends,
Both 54 abut the intermediate stopper 55, the water supply pipe 13 and the jet water supply pipe 8 communicate with each other through the second communication groove 21, and water is sent to the jet water pipe 8 to wash the subject. Be seen.

After the end of the endoscopic examination, the piston 15 can be pulled out from the inside of the cylinder 10 by disengaging the operation button body 50 from the flange-shaped portion 10a of the cylinder 10.

Then, as shown in FIG. 5, the piston 15 can be thoroughly washed by turning up the operation button body 50 to the head side. Furthermore, if the operation button body 50 is removed from the piston 15, each part can be cleaned more reliably.

The present invention is not limited to the above embodiment, and the operation button body 50 has a strong elasticity on the head side portion 50a side and a weak elasticity on the base side portion 50b side. Alternatively, the operation button body 50 may have a shape other than the above.

Further, the conduit switching device for an endoscope of the present invention is applied to a switching operation device for only air and water supply, and an air supply state is established at an intermediate position shown in FIG. 3 and a pushing operation shown in FIG. Water may be supplied in this state, or the present invention may be applied to a switching operation device in which suction states are combined.

[0028]

According to the present invention, the urging means for urging the piston body is formed of rubber or plastic into a cylindrical shape, and when the cylindrical urging means is compressed in the axial direction. First, the weak crushing part that is crushed and the strong bulging part that is more elastic than the weak bulging part are integrally formed, and when the weak bulging part is completely crushed Since it is located in the middle part, the piston body can be stopped at the middle position during operation with one tubular member without using a coil spring, etc., so the structure is extremely simple and after use Can be reliably and easily washed, and the component cost and the assembly cost can be reduced.

If the urging means is detachably attached to the cylinder body and the piston body, cleaning after use can be performed more reliably and easily.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a standby state according to an embodiment.

FIG. 2 is a side view of the distal end of the endoscope insertion portion according to the embodiment.

FIG. 3 is a vertical cross-sectional view of a water supply state of the example.

FIG. 4 is a vertical cross-sectional view of a water supply state for cleaning an object according to the embodiment.

FIG. 5 is a perspective view of the removed piston side portion of the embodiment.

[Explanation of symbols]

 10 Cylinder 15 Piston 50 Operation Button Body (Biasing Means) 50a Head Side Part (Weak Repulsion Part) 50b Base Side Part (Strong Repulsion Part)

Claims (2)

[Claims] 1. A piston body is arranged axially in a cylinder body to which the fluid pipeline is connected in order to switch the connection state of the fluid pipeline, and the piston body is moved forward and backward in a predetermined intermediate portion of a forward and backward range. In a conduit switching device for an endoscope in which the fluid conduit is brought into one of a plurality of connected states by resting the piston body in a direction in which the piston body pushed into the cylinder body is pulled out from the cylinder body. The urging means for urging the elastic member is formed in a tubular shape from elastic rubber or plastic, and the tubular urging means has a weak elastic portion that is first crushed when compressed in the axial direction. , Integrally forming a strong resilient part that is more resilient than the weak resilient part, and when the weak resilient part is in a completely crushed state, the position of the piston body is at the predetermined intermediate part. Characterized by being located Pipeline switching device for endoscopes. 2. The conduit switching device for an endoscope according to claim 1, wherein the urging means is attachable to and detachable from the cylinder body and the piston body.