JPH02286145A - Conduit line switching device - Google Patents

Abstract

PURPOSE:To simplify the decomposition and assembling of a conduit line switching member by relatively moving a cam pin along a cam groove when a pressing member is rotated, moving the pressing member in an axial direction and pulling off the conduit line switching member from the inside of a recessed part. CONSTITUTION:The cam pin 80 is engaged with the cam groove 82 provided on the inner peripheral surface of a pressing member 81. By rotating the pressing member 81, the cam pin 80 is relatively moved along the cam groove 82 and the pressing member 81 is moved upward. When the upper end of the pressing member 81 is abutted on a switching lever 83 fixed to a shaft body 61 by a screw, the switching lever 83 is moved upward and a cylindrical body 61, a fitting shaft 63 fitted to the shaft body 61 and a conduit line switching member 62 are pulled off from the inside of the recessed part 60 in the main body 57 of a switch part. At this time, since the conduit line switching member 62 is taper-shaped, an area adhered with the recessed part 60 can be enlarged and the separation is also facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe switching device, and particularly to a pipe switching device used for switching pipes in an endoscope.

[Conventional technology]

In recent years, ultrasonic endoscopes have been developed that are equipped with an ultrasonic probe at the distal end of the endoscope insertion section and are capable of obtaining ultrasonic tomographic images inside body cavities. In order to obtain good ultrasound tomographic images with this ultrasound endoscope, a balloon is installed at the tip of the endoscope insertion section, and liquid is pumped into the balloon to inflate it and bring the balloon into contact with the body cavity wall. It is necessary to scan the ultrasonic waves while the For this reason, a conduit for feeding liquid into the balloon is provided inside the endoscope insertion section. When sending liquid to this conduit, conventionally a syringe or the like was used to send the liquid through the liquid sending port provided in the operating section, which required the endoscope to be sent with one hand. There was a problem with bad sex.

Therefore, in order to solve this problem, a pipe switching device was installed in the middle of the water pipe that sends cleaning water to the observation window of the observation optical system, and one end of the balloon liquid delivery pipe was connected to this pipe switching device. This is proposed in Japanese Patent Application Laid-Open No. 82-275440. The above conduit switching device has a configuration as shown in factor 20, and the conduit switching member C, which is slidably fitted into the recess of the switching unit body a, is rotated by a cock d to switch the conduit. It looks like this.

[Problem to be solved by the invention]

However, in the conventional pipe switching device described above, when the user attempts to disassemble it for cleaning and disinfection, it is necessary to first remove the screw e, and then remove the cover f1 and the retaining ring g in sequence. There was a problem that disassembling and reassembling was troublesome.

The present invention has been made to solve these problems, and an object of the present invention is to provide a pipe switching device that allows a user to disassemble and assemble a container.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a switching part main body to which a plurality of conduits are connected, and a recess formed in the switching part main body and having a plurality of communication holes, each communicating with the conduit, on an inner circumferential surface thereof. a conduit switching member that is slidably fitted into the recess and selectively communicates at least two of the conduits through the communication hole; The holding member is provided with a holding member fixed in the recess, a cam groove provided on the inner circumferential surface of the holding member, and a pair of cam pins removably engaged with the cam groove.

[For production]

In the present invention, when the presser member is rotated, the cam pin moves relatively along the cam groove, and the presser member is moved in the axial direction to pull out the conduit switching member from the recess, making it easy to disassemble and reassemble the conduit switching section. can be done.

〔Example〕

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

1 to 17 show an embodiment in which the present invention is applied to an ultrasonic endoscope, and FIG. 1 is a diagram showing the overall configuration thereof. In the figure, 1 is an endoscope main body consisting of an insertion section 2 and an operating section 3, and a universal cord 4 having a connector section 5 at the end is connected to the operating section 3 of the endoscope main body 1. There is. On the other hand, at the tip of the insertion section 2, an ultrasonic probe 6 is provided inside a tip cover 7, and a balloon 8 is provided outside the tip cover 7. Inside the insertion section 2, an image guide 9, a light guide (not shown), a conduit 10 for cleaning the observation optical system, a conduit 11 for water supply inside the balloon, a conduit 12 for drainage inside the balloon, and a conduit 12 for inserting a treatment instrument are provided. A conduit 13 is provided. Note that an ultrasonic medium liquid such as liquid paraffin is sealed inside the tip cover 8.

The image guide 9 is connected from the distal end of the insertion section 2 to the operation section 3.
An objective lens 14 is provided on the incident end side, and an eyepiece lens 15 is provided on the exit end side. Further, one end of the observation optical system cleaning conduit 10 opens near the objective lens 14, and the other end branches into a cleaning water supply conduit 16 and an air supply conduit 17. One end of each of the intra-balloon water supply conduit 11 and the intra-balloon drainage conduit 12 opens inside the balloon 8, and the other end of the intra-balloon water supply conduit 11 is connected to the proximal end of the insertion section 2. The pipe switching section 18 is connected to the pipe switching section 18 provided therein. on the other hand,
The other end of the balloon drainage pipe 12 communicates with a suction pipe 20 via a suction switching valve 19 provided in the operating section 3 . One end of this suction conduit 20 is connected to a suction cap 21 provided on the connector portion 5 of the R-rated universal cord 4, and the other end communicates with the treatment instrument insertion conduit 13. In addition,
One end of the treatment instrument insertion conduit 13 opens at the distal end of the insertion section 2, and the other end communicates with a treatment instrument insertion port 22 provided in the operating section 3.

Further, the cleaning water supply pipe 16 is connected to the pipe switching section 18 similarly to the intra-balloon water supply pipe 11, and the air supply pipe 17 is connected to the connector of the universal cord 4 via the air/water supply switching valve 23. It is connected to air supply caps 24 and 25 provided in section 5. The pipe switching section 18 also includes a water supply pipe 2.
The other end of the water supply pipe 26 is connected to a water supply mouthpiece 27 provided on the connector portion 5 of the universal cord 4 via an air/water supply switching valve 23 . Note that the connector portion 5 is provided with an incident end 28 of a light guide connected to a light source device (not shown).

The configuration of the suction switching valve I9 is shown in FIG. 2. In the same figure, an attachment hole 30 is bored in the outer wall 3a of the operation section 3, and a cylinder 31 as a valve seat body is fitted into the attachment hole 30. The outer end of the cylinder 31 projects outward from the outer wall 3a, and a collar 32 is formed on the outer periphery of the inner end of the cylinder 31 to abut against the inner surface of the outer wall 3a.

A mounting ring 3 is attached to the outer periphery of the outer end of the cylinder 31.
3 is screwed in, and this installation is done by sandwiching the outer wall 3a between the ring 33 and the collar 32.
The cylinder 31 is fixed to the outer wall 3a. In addition,
A ring packing 34 is fitted between the inner peripheral surface of the mounting hole 30 and the outer peripheral surface of the cylinder 31 to maintain liquid tightness.

Further, a first connecting pipe 35 is provided at the inner end of the cylinder 31.
The suction source side conduit section 20a of the suction conduit 20 is connected through the suction conduit 20. Further, an opening 3G opening into the cylinder 31 is formed in the side wall of the cylinder 31, and a suction pipe 2 is connected to the opening 3B via a second connecting pipe 37.
No. 0 distal end side conduit portion 20b is connected.

Inside the cylinder 31, a first piston 3B and a second piston 39 for switching control are provided.

The first piston 38 is fitted inside the second piston 39. In addition, the first piston 38 and the second piston 39
are each biased upwardly by a spring 40.41, which abuts a sealing member 43 integrally formed on the piston mounting member 42. A cylinder seal member 44 and a piston mounting rubber 45 are also integrally molded on the piston mounting member 42, and the piston seal member 44 contacts the stepped portion of the second piston 39 to prevent the second piston 39 from being pulled out. In addition to preventing this, the position of the second piston 39 during standby is also regulated. The piston mounting rubber 45 is elastically fitted to the collar 33a of the mounting ring 33 to fix the first piston 38 and the second piston 39 to the cylinder 31.

Further, a stopper 47 for removing the first piston 38 is screwed into the upper part of the second piston 39, and prevents the first piston 38 from being removed above the second piston 39, and also prevents the first piston 38 from being removed above the second piston 39. It also serves as a butt.

On the other hand, a connecting member 48 is screwed into the upper end of the first piston 38, and an operating button 49 made of hard plastic is fitted onto the upper surface of its outer end. The periphery of the operation button 49 is formed as a falling cylindrical wall 50, and this wall 50 enters inside the piston mounting member 45 when the first piston 38 and the second piston 39 are pushed in. , so as to abut against the upper surface of the sealing member 43.

Further, a plurality of leak holes 5L are formed above the walls of the first piston 38 and the second piston 39, and the first
When the piston 38 and the second piston 39 are on standby, they communicate with the outside air. Note that the side wall of the cylinder 31 is designed to prevent the second piston 39 and the cylinder 31 from rotating and the opening 52 provided below the wall of the second piston 39 and the cylinder opening 3B not matching during suction. A guide pin 53 is provided that protrudes from the inner wall surface of the second piston 39, and a flat surface 54 is formed along the axial direction on the peripheral surface of the second piston 39 corresponding to the guide pin 53. The pin 53 is engaged. In order to prevent the leak hole 51 from shifting when the first piston 38 and the second piston 39 rotate relative to each other, the upper part of the first piston 3B is formed into a square column shape as shown in FIG. By providing a large number of round holes 47a in 47, the angle can be adjusted. Note that a rubber ring 55 and an O-ring 56 are attached to the second piston 39.

Further, the upper part of the second piston 39 is larger than the lower part so that the guide pin 53 does not damage the rubber ring 55, and the flat surface 54 and the rubber ring 55 are made to be on the same plane. The cylinder 31 has an opening 36 communicating with the suction conduit 20 for suctioning the ultrasonic medium liquid, and is normally sealed by an O-ring 5B.

The suction switching valve 19 configured as described above is in a standby state when both the first piston 38 and the second piston 39 are not pushed in as shown in FIG. From the leak hole 5'l and "
The outside atmosphere is sucked through the suction pipe 20 and the opening 52 of the second piston 39 and the first piston 38 when only the first piston 38 is pushed in as shown in FIG.
Since the opening 52 of the piston 38 is aligned and the leak hole 51 is closed, the distal conduit 2 is inserted through the opening 38.
Suction is performed from 0b through the suction pipe line 20 via the connecting pipe 37. At this time, there is a possibility that suction may be performed from the outside, but the suction from the rubbing portion 38b between the first piston 38 and the second piston 39 is small. Also, the second
Since a sealing member 44 is provided at the abutting portion between the stepped portion of the piston 39 and the piston mounting member 42, there is no natural suction from this portion. The gap between the second piston 39 and the cylinder 31 is sealed by the close contact between the piston mounting rubber 45 and the outer wall 3a'.

Furthermore, when both the first piston 38 and the second piston 39 are pushed in as shown in FIG. The liquid is suctioned through the opening 36 from the suction side conduit 20a for suctioning the liquid. At this time, since the suction side conduit 20a is thinner than the distal side conduit 20b, the conduit resistance is large and the suction force is considered to be weaker than that of the distal side conduit 20b. Therefore, although it is considered that there is a lot of suction from the outside air, suction from the rubbing portion Ha is not performed because the peripheral wall portion 50 of the operation button 49 hits the sealing member 43. Also, the second piston 39
The suction from the gap between the cylinder 31 and the cylinder 31 is sealed as described above. Therefore, even if the pipe resistance is large, a larger amount of suction can be secured.

Next, the conduit switching section 18 will be explained. The conduit switching section 18 is constructed as shown in FIGS. 7 to 18, and the switching section main body 57 is attached and fixed to a support cylinder 58 in the operating section 3 using screws or the like. This switching section main body 57
As described above, one ends of the cleaning pipe lO, the intra-balloon water supply pipe 11, and the water supply pipe z6 are connected to the pipe 10, respectively. Further, the switching section main body 57 has an open end on the cover 59 side, and is formed with a circular recess 60 whose diameter tapers downwardly. This recess BO
A tapered conduit switching member B2 to which the tip of a shaft 61 passing through the cover 59 is attached is slidably fitted.

This pipe switching member 62 is fitted into the shaft 6I.
3 with a connecting screw B4, and the pipe switching member 62
It can be easily replaced when it wears out.

In addition, between the fitting shaft 63 and the pipe switching member &2,
A anti-rotation bottle B5 is inserted.

The pipe switching member 62 and the fitting shaft B3 have a ninth
As shown in the figure, a T-shaped flow path is formed, and the shaft body 6
1, it is possible to selectively switch between the cleaning conduit lO and the intra-balloon water supply conduit 11. A support cylinder 6B is provided on the outside of the shaft body at, and passes through the cover 59 and fits into the switching section main body 57. □The support tube 66 allows the cover 5 to
9 and the switching section main body 57 are fixed, and the shaft body 81 and the support tube 6
B and between the support cylinder 6B and the cover 59 are O-rings 87. lsg is provided. Further, a sealing material B9 is also provided between the support tube 6B and the switching section main body 57 for the purpose of protection.

The structure for attaching the support tube 6B to the cover 59 is such that a part of the cover 59 is opened to form a cylindrical connection part 70, as shown in FIG. 1I. A projection 72 is provided at the upper end of the connecting portion 70 to fit into the groove 71 of the support tube B6 and to prevent rotation of the support tube 66. Also. Connection part 7
A flange portion 75 having a diameter larger than the inner diameter of an arm portion 74 provided on the engagement member 73 is formed on the upper end side portion of G. When the arm portion 74 is inserted from the side so as to enter and engage with the flange portion 75, the arm portion 74 can be arranged so as not to move in the vertical direction. Note that the cover 59 and the connecting portion 70 are integrally formed of an electrically insulating material such as plastic.

Further, a female thread 76 is carved on the inner surface of the engaging member 73, and a tightening ring 77 is screwed into the female thread 76. This tightening is such that the lower surface of the ring 77 abuts against the upper end 78 of the connecting portion 70. Also,
For tightening, there is a washer 79 at the bottom of the ring 17, and a support tube 6B is provided below it. As the ring 77 is tightened, the support tube 6 is tightened through the washer 79.
6 is pushed downward to compress the sealing material 69 and improve the sealing performance.

Further, a cam pin 80 is press-fitted into the outer surface of the engaging member 73. This cam pin 80 engages with a cam groove 82 provided on the inner peripheral surface of the presser member 81.
By rotating the cam pin 80, the cam pin 80 moves relatively along the cam groove 81, and the holding member 81 is moved upward. Then, the upper end of the presser member 81 is connected to the shaft body 61.
When the switching lever 83 comes into contact with the switching lever 83 screwed to the switch, the switching lever 83 moves upward and moves the fitting shaft 63 attached to the cylindrical body 81 and the shaft body 81 and the conduit switching member 62 into the recess 60 of the switching section main body 57. It is designed to be pulled out from the

At this time, since the conduit switching member 62 is formed in a tapered shape, the area of close contact with the recess 60 can be increased, and separation is also facilitated. Further, the pressing member 81 is the twelfth
As shown in the figure and Fig. 13, the lower end surface is not straight,
By forming a curve along the inclination of the cam groove 82 to follow the curve of the circumference of the cover 59, the height of the conduit switching section 7 can be reduced. Another advantage of using the cam groove 82 is that the cam pin 80 is not press-fitted at a position that bisects the circumference, but is press-fitted at an asymmetrical position, so that the cam pin 80 is not fitted into the cam groove 82 easily. This can be done in only one direction, and it is possible to prevent incorrect assembly of the conduit switching member 62 to the switching section main body 57.

14 and 15 show the structure of the tip of the insertion section, in which a forceps lifting wire 90 is bent and fixed to a forceps stand 91. Then, the bent part is the forceps stand 9.
A part of the edge of the plastic cover 92 is hollowed out so that it does not rub against the edge of the plastic cover 92 even when the bra cover 1 is completely raised. Furthermore, the light guide fiber 93 is shown in FIGS. 16 and 17.
As shown in the figure, the straight portion is fixed to the tip with a screw 94.

FIG. 18 shows a second embodiment of the present invention, in which a single pipe line 100 is used for air supply, water supply, and suction. In addition, the water supply pipe line 26, the air supply pipe line 17,
The confluence section 101 of the gas supply pipe line 102 is connected to the air and water supply switching valve 23.
It is approximately 50mm away from the center. Note that 103 is a gas supply button.

FIG. 19 is a sectional view of the air/water supply switching valve of the same embodiment,
Air is supplied to the cylinder 110 when the opening 112 of the operation button 1it is covered with a finger, and furthermore, in this state, the operation button 11
A piston 113 is attached that allows water to be supplied by pushing in the piston 113.

〔Effect of the invention〕

As explained above, the present invention includes a switching part main body to which a plurality of pipes are connected, a recessed part formed in the switching part main body and having a plurality of communication holes on the inner peripheral surface communicating with the pipes, respectively; a conduit switching member that is slidably fitted into the recess and selectively communicates at least two of the conduits through the communication hole; The holding member includes a holding member fixed to the holding member, a cam groove provided on the inner circumferential surface of the holding member, and a pair of cam pins detachably engaged with the cam groove. Therefore, when the holding member is rotated, the conduit switching member is naturally pulled out from the recess of the switching section main body, so that a conduit switching device that can be easily disassembled and reassembled can be provided.

[Brief explanation of drawings]

1 to 13 show an embodiment of the present invention, in which FIG. 1 is an overall configuration diagram of an ultrasonic endoscope, FIGS. 2 to 4 are sectional views of a suction switching valve, and FIG. 5 is a sectional view of a suction switching valve. A sectional view taken along the line A-A in FIG.
Fig. 6 is a sectional view taken along the line B-B in Fig. 2, Fig. 7 is a sectional view of the pipe switching device, Fig. 8 is a sectional view of Fig. 7 viewed from the right, and Fig. 9 is a sectional view of the pipe line. A horizontal sectional view of the switching member, FIG.
11 is a sectional view showing the mounting structure of the support tube 66, FIG. 12 is a developed view showing the shape of the cam groove, and FIG. 13 is a side view of the pipe switching device. , FIG. 14 is a sectional view showing the distal end of the insertion section, FIG. 15(a-) is a sectional view taken in the direction of arrow DD in FIG. 14, and FIG. 15(b) is a sectional view in the direction of arrow E shown in FIG. FIG. 16 is a cross-sectional view showing the vicinity of the output end of the light guide, FIG. 17 is a cross-sectional view taken along the line F-F in FIG. 16, and FIG. 18 is a second embodiment of the present invention. FIG. 19 is a schematic diagram of the endoscope, FIG. 19 is a sectional view of the air/water supply switching valve of the same embodiment, and FIG. 20 is a diagram showing a conventional pipe switching device. DESCRIPTION OF SYMBOLS 1...Ultrasonic endoscope, 2...Insertion part, 3...Operation part, 4...Universal cord, 6...Ultrasonic probe, 8...Balloon, IO... Observation optical system cleaning conduit, 11... In-balloon water supply conduit, 12... In-balloon drainage conduit, 13... Treatment instrument insertion conduit, 1G
... Clean water supply pipe, 17... Air supply pipe, 1.
・Pipe line switching unit, 19... Suction switching valve, 20... Suction line, 23... Air supply/water supply switching valve, 27... Water supply line, 57... Switching unit body, 62. ... Pipe switching member, 8
0...come pin, 8! ... Pressing member, 82 ... Cam groove, 83 ... Lever applicant's agent patent attorney ear piece
Jundai Figure 7a Figure Figure 7a. 2. Figure 2. Figure 2. Figure Procedure.

Claims (2)

[Claims] (1) A switching part main body to which a plurality of pipes are connected, a recess formed in the switching part main body and having a plurality of communication holes on the inner circumferential surface communicating with the pipes, and a slider that slides into the recess. a conduit switching member that freely fits and selectively communicates at least two of the conduits through the communication hole; and a presser member that fixes the conduit switching member within the recess. A conduit switching device comprising: a cam groove provided on the inner circumferential surface of the holding member; and a pair of cam pins removably engaged with the cam groove. (2) The conduit switching device according to claim 1, wherein the cam pin is provided at an asymmetrical position.