JP3431339B2 - Endoscope conduit switching device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope conduit switching device for performing an air supply operation and a suction operation in an endoscope. 2. Description of the Related Art In an endoscope, in many cases, an air supply control valve for performing an air supply operation to a body cavity for inflating a body organ, and blood, secretions and other contaminants in the body cavity. And a suction operation valve for performing a suction operation for sucking and removing the liquid. Further, a forceps insertion port is provided for inserting a treatment tool for performing a treatment such as collecting tissue in a body cavity, and the forceps insertion port is usually closed to insert the treatment tool. Then, the forceps stopper which is opened thereby is attached. However, in the conventional endoscope, since the air supply operation valve, the suction operation valve, and the forceps insertion port are separately provided, the structure is complicated and the manufacturing cost is reduced. It was difficult to completely clean and disinfect after using the endoscope. Accordingly, the present invention provides an endoscope conduit switching device that can have a very simple structure, and can realize improved operability, drastically reduced manufacturing cost, and improved cleaning performance. The purpose is to provide. In order to achieve the above object, a pipe line switching device for an endoscope according to the present invention comprises an air supply pipe connected to an air supply device and a suction device connected to a suction device. By connecting the pipe and the cylinder to the cylinder body, connecting the base end of the channel opening at the distal end of the insertion section of the endoscope to the bottom of the cylinder body, and moving the piston body in the cylinder body in the axial direction, The connection state of the air supply pipe and the suction pipe to the channel is switched, and a forceps stopper that is normally closed and opened by inserting a treatment tool is formed at the head of the piston body, and the forceps stopper is formed. A passage for guiding the treatment tool inserted from the inside of the channel is formed in the piston body. An embodiment will be described with reference to the drawings. FIG. 5 shows an endoscope used for examination of the stomach and other digestive tracts. Reference numeral 2 denotes an operation unit, and reference numeral 3 denotes an insertion unit formed of a flexible tube. A distal end main body 5 containing an objective optical system and the like is connected to the distal end of the insertion section 3. The operation section 2 is provided with an air supply / suction switching operation valve 40 on the front side, and an eyepiece section 8 protrudes from an upper end thereof. A connector (not shown) that is detachably connected to the light source device is attached to a distal end of the connection flexible tube 9 connected to the operation unit 2. An air supply / suction / forceps channel 6 (hereinafter simply referred to as “channel 6”) that opens outward in the distal end body 5 is inserted from the operation section 2 into the insertion section 3. The base end of the channel 6 is connected to the bottom of the air supply / suction switching operation valve 40. Further, an air supply pipe 11 and a suction pipe 12 connected to an external air supply device and a suction device (not shown) are connected to the side surface of the air supply / suction switching operation valve 40 through the connection flexible tube 9. I have. FIG. 1 shows a standby state of the air supply / suction switching operation valve 40. A cylinder body 41 is provided in the operation section 2 and its mouth is open to the outside of the operation section 2.
The channel 6 is connected to the center axis position at the bottom of the cylinder 41, and the air supply pipe 11 and the suction pipe 12 are connected to the side of the cylinder 41. A leak hole 42 communicating with the atmosphere is formed in a side surface of the cylinder body 41. A metal or plastic piston body 43 is inserted into the cylinder body 41 so as to be able to advance and retreat in the axial direction. A shaft hole 45 (passage) extending over the entire length is provided at the axial position of the piston body 43. It is drilled through. An air supply pipe 11 is provided on the outer peripheral surface of the piston body 43.
A wide communication groove 46 communicating with the suction pipe 12 and the leak hole 42 is formed on the circumferential surface. A narrow circumferential groove 47 is formed on the hand side (mouth side) of the communication groove 46, and the communication hole 48 connects the circumferential groove 47 and the shaft hole 45. Before and after each groove 46, 47, a piston body 43 is provided.
An O-ring for sealing is mounted on the outer periphery of. The head of the piston body 43 projects outwardly from the mouth of the cylinder body 41.
An elastic operation button 50 made of, for example, rubber is attached. The protruding end of the operation button 50 is
3 is detachably attached to a flange-like portion 43a protruding from the protruding end of the cylinder 3, and the base of the operation button 50 is detachably attached to a flange-like portion 41a protruding from the mouth of the cylinder body 41. I have. The operation button 50 is formed in a hollow figure-eight cross section, and an air passage 51 communicating between the upper and lower chambers is formed between the operation button 50 and the piston body 43 at an intermediate portion thereof. . The operation button 50 is formed such that the thickness of the base half 50a near the cylinder body 41 is smaller than the thickness of the head half 50b. Therefore, the piston body 4
Operation button 50 in the direction in which
When the finger is pressed from the tip end side with a fingertip, the base half 50a is first crushed as shown in FIG. 2, and when the operation button 50 is further pressed, the head half 50b is crushed as shown in FIG. . When the pushing force of the fingertip is reduced, the head half 50b is first restored as shown in FIG. 2 by the elasticity of the operation button 50, and then the base half 50 as shown in FIG. The unit 50a restores. Reference numeral 52 denotes an operation button 5 for such an operation.
The head side half 5
0b is an air hole formed in the outer wall surface. 53
As shown in FIG. 3, when the head half 50b is crushed, it is a ventilation groove 53 for letting air in and out between the head half 50b and the base half 50a. A finger pad 54 for applying an operation finger is formed at the protruding end of the operation button 50. At the center of the finger pad 54, the finger pad 54 is always closed and opened when the treatment tool 100 is inserted. ”-Shaped slit is formed, and the portion is a so-called forceps stopper. In the embodiment apparatus thus formed, in the standby state, as shown in FIG. 1, air sent from the air supply pipe 11 into the cylinder body 41 passes through the communication groove 46, and the suction pipe. The air is sucked by the air outlet 12 and the difference between the air supply amount and the suction amount is sent out or sucked from the leak hole 42. Then, as shown in FIG.
4 at the base half of the operation button 50
When the piston body 43 is pushed down to the position where 0a is completely crushed, the circumferential groove 47 faces the opening of the air supply pipe 11, and the air supply pipe 11 is inserted into the shaft hole 45 through the circumferential groove 47 and the communication hole 48. The air is further supplied from the air supply pipe 11 to the distal end of the insertion portion through the channel 6. Atmosphere is sucked into the suction pipe 12 through the leak hole 42 and the communication groove 46. As shown in FIG. 3, when the piston body 43 is pushed in until the operation button 50 is completely crushed, the circumferential groove 47 faces the opening of the suction tube 12, and the circumferential groove 47 and the communication hole 48 are opened. Then, the suction tube 12 communicates with the shaft hole 45 via the channel 6, and suction is performed from the distal end of the insertion portion to the suction tube 12 through the channel 6. The air sent from the air supply pipe 11 into the cylinder body 41 is released to the atmosphere through the ventilation path 51, the ventilation groove 53, and the ventilation hole 52. As shown in FIG. 4, when the treatment tool 100 is inserted into the slit of the forceps plug 55 from the outside in the standby state, the treatment tool 100 pushes the slit open and is formed on the piston body 43. It is guided into the channel 6 through the shaft hole 45 and protrudes from the opening at the distal end of the insertion portion. After the endoscope inspection, the operation button 50 is removed from the cylinder body 41 and the piston body 43, the piston body 43 is pulled out from the cylinder body 41, and the inside of the cylinder body 41, the piston body 43 and the forceps stopper 55 are removed. Can be easily washed at the same time. According to the present invention, the operation of switching between air supply and suction can be performed by operating the piston body in the cylinder body in the axial direction, and the piston body is formed on the head of the piston body. Since the treatment tool can be inserted from the set forceps stopper, all operations can be performed with a single operation valve having a simple structure, and the overall structure can be extremely simplified, improving operability. In addition, the manufacturing cost can be significantly reduced, and it can be easily cleaned after use.

[Brief description of the drawings] FIG. 1 is a longitudinal sectional view of a standby state of an embodiment. FIG. 2 is a longitudinal sectional view of an air supply state of the embodiment. FIG. 3 is a longitudinal sectional view of a suction state of the embodiment. FIG. 4 is a longitudinal sectional view of the treatment tool used in the embodiment. FIG. 5 is a side view of the endoscope of the embodiment. [Explanation of symbols] 6 channels 11 Air pipe 12 suction tube 41 cylinder body 43 piston body 45 Shaft hole (passage) 55 forceps stopper 100 treatment tool

Claims (1)

(57) [Claims 1] An air supply pipe connected to an air supply device and a suction pipe connected to a suction device are connected to a cylinder body, and an opening is formed at the distal end of the insertion portion of the endoscope. The base end of the channel to be connected is connected to the bottom of the cylinder body, and the connection state of the air supply pipe and the suction pipe to the channel is switched by operating the piston body in the cylinder body in the axial direction . In the pipeline switching device of the endoscope, in the standby state where the piston body is not pushed in,
Are connected in a state where the suction pipe and the air supply pipe communicate with the outside air.
Between the two pipes and the above channel,
The state where the piston body is pushed into the specified air supply position
In the above, the air pipe and the channel communicate with each other.
The suction pipe communicates with the outside air, and the piston body
When pushed to the pull position, the suction tube
The air channel communicates with the outside air through the channel
A plunger plug that is normally closed and opened by inserting a treatment tool is formed on the head of the piston body, and the treatment tool inserted from the forceps plug is guided into the channel while being normally closed. Characterized in that a passage for the endoscope is formed in the piston body.