JP3756776B2 - Endoscope - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope in which a nozzle for fluid ejection is provided in a tip body.
[0002]
[Prior art]
For example, in an endoscope for digestive organs, mucus or the like may adhere to the objective lens during an endoscopic examination, thereby obstructing the visual field. Therefore, the air supply / water supply pipe switching device provided in the operation part of the endoscope is operated, and air or cleaning is performed on the surface of the objective lens from the nozzle provided in the tip structure part via the air supply / water supply channel. Water is sprayed to remove adhered mucus and the like.
[0003]
A typical example is shown in Japanese Utility Model Laid-Open No. 2-88603. The configuration includes a cylinder embedded in the operation portion of the endoscope and a rigid piston that is inserted into the cylinder so as to be able to advance and retreat, and switches between air supply and water supply. The piston is detachably attached to the cylinder by a fitting member to be inserted. An air supply line and a water supply line from the gas supply source and the cleaning water supply source, and an air supply line and a water supply line communicating with the nozzle are connected to the cylinder.
[0004]
In an annular groove provided on the outer periphery of the piston, a packing made of a sealing elastic body is fitted, and a pipe line is formed by dividing a space between the cylinder and the piston.
[0005]
When the packing is mounted on the piston, the inner diameter is expanded using the elasticity of the packing, and the piston is mounted in the annular concave groove over the large diameter portion of the piston.
[0006]
[Problems to be solved by the invention]
However, since the pipe switching device for air / water feeding shown in Japanese Utility Model Publication No. 2-88603 has a packing in an annular groove provided in the piston, there is a gap between the packing and the groove. There is a tendency for dust or foreign matter to enter this gap.
[0007]
To remove the dirt that has entered the gap, the piston is removed from the air / water pipe switching device, immersed in the cleaning solution for a long time, rinsed in running water, and then the water remaining in the gap is dried. It took a lot of time and labor for cleaning, and it was a burden on the workers.
[0008]
In addition, in order to reduce the work time and labor, introducing an ultrasonic cleaning device, a drying device or the like has a problem that a lot of costs are generated.
[0009]
In addition, in the work of attaching the packing to the annular groove, when expanding the inner diameter of the packing, the packing is not damaged, or the packing does not touch the corner (edge) of the piston and damage the packing. Care must be taken to get over the multiple annular grooves, and care must be taken not to attach the packing to the piston when the packing is twisted. It was.
[0010]
The present invention has been made paying attention to the above circumstances, and the purpose of the present invention is to facilitate the work of eliminating the gap on the outer surface of the tip body, and to deteriorate even after long-term use. It is an object of the present invention to provide an endoscope that has excellent resistance, is easy to clean, and does not collect dirt easily.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided an endoscope in which a nozzle for fluid ejection is provided at a distal end body of the endoscope, wherein the nozzle is , It has a flow path inside, and the shape is different from the base side of the nozzle Including throat Nozzle body having a deformed portion, at least the tip body and the nozzle Body The gap formed by the deformed part of Cover the outer peripheral part at least over the deformed part of the nozzle body so that it fills the shape, and integrate with the nozzle body in advance before incorporating it into the tip body The tip body has an opening recess corresponding to at least a part of the outer shape of the nozzle support member, and the nozzle is detachably inserted into the opening recess. In addition to fixing, the outer surface of the distal end portion of the endoscope is constituted by at least the distal end portion main body and the nozzle support member.
Claim 2 is claimed in claim 1 The nozzle is Epoxy adhesive Formed by integrally molding the nozzle support member consisting of the nozzle body and the nozzle body It is characterized by being.
[0012]
[Action]
It is easy to eliminate the gap on the outer surface of the tip body. Moreover, since the nozzle support member is hard, it does not deteriorate even during long-term use, and has excellent resistance. Furthermore, since the surface of the nozzle support member is kept in the initial state, it is easy to clean and dirt is not easily collected. In addition, since a nozzle part with a gap filled in advance can be created and stocked at the time of repair, it is possible to omit the work of filling the gap in the nozzle deformed part during use. Moreover, there is no variation by an operator, and quality can be stabilized.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
1 to 4 show a first embodiment, FIG. 1 is a longitudinal side view of a pipeline switching device, FIG. 2 is an overall configuration diagram of an endoscope device, and FIG. 3 is an enlarged view of a part of a packing support member. FIG. As shown in FIG. 2, the endoscope 1 includes an operation unit 2. The operation part 2 is provided with a grip part 2a for holding it by hand. An insertion portion 3 and a universal cord 4 are connected to the operation portion 2.
[0015]
A connector 5 is provided at the end of the universal cord 4, and this connector 5 is connected to a light source device 6 that supplies illumination light. The insertion portion 3 is provided with a distal end constituting portion 9 via a bending portion 8 which is bent by an angle knob 7 provided in the operation portion 2, and the distal end constituting portion 9 has a forceps channel inserted in the insertion portion 3. An opening 9d is provided. The other opening of the forceps channel communicates with a forceps opening 10 provided in the operation section 2. Furthermore, the distal end configuration unit 9 is provided with an observation window 9b, a nozzle 9a that can supply air and water toward the observation window 9b, and an illumination window 9c for illuminating the observation object. .
[0016]
A forceps plug 11 is attached to the forceps opening 10 as necessary. The insertion portion 3 is provided with a bend preventing portion (not shown) for preventing breakage, and this bend preventing portion is covered with a bend preventing cover 12 provided at an end portion of the operation portion 2.
[0017]
The connector 5 of the universal cord 4 is connected to an air supply device 13, a water supply device 14, and a gas supply device 15, and is connected to a video processor 16 that processes video signals via a connection adapter 16a. . The video processor 16 has a monitor 17 for displaying a subject image based on a video signal subjected to signal processing, a VTR deck 18 for recording / reproducing the video signal, a video printer 19 for printing a subject by the video signal, and a large video signal recording unit. A video disk 20 or the like which is a storage device having a capacity is connected.
[0018]
A switch 21 for operating the video processor 16 is provided in the operation unit 2. Further, the operation unit 2 is connected to a nozzle 9a that opens at the distal end configuration unit 9 of the insertion unit 3, and is configured to supply and supply air / water, a suction / water supply switching device 22, a suction operation device 23 for suction, and a CO. ₂ A gas feeding operation device 24 for pumping a gas such as an inert gas is provided. That is, the operation section 2 is provided with a pipe switching device which is a main part of the present invention.
[0019]
Next, the air / water supply switching device 22 shown in FIG. 1 will be described. The air / water supply switching device 22 includes a cylinder portion 25 and a piston portion 26. In FIG. 1, the piston portion 26 shows a natural state on the left side and a pushed-in state on the right side.
[0020]
A mounting hole 28 is formed in the casing 27 constituting the operation unit 2, and a cylinder part 25 is fixed to the mounting hole 28 by means described later, and a piston part 26 is detachably attached to the cylinder part 25. It is inserted.
[0021]
The cylinder part 25 has a substantially cylindrical cylinder 30 made of metal with a step, and a side wall of the cylinder 30 is a gas outlet communicating with the nozzle 9a in order from the opening side to the bottom side. An air supply line 31; an air supply line 32 that is a gas inlet that communicates with the air supply device 13; a water supply line 33 that is a liquid outlet that communicates with the nozzle 9a; and a liquid inlet that communicates with the water supply device 14. A water supply line 34 is provided.
[0022]
The air supply conduit 31, the air supply conduit 32, and the water supply conduit 33 protrude in the direction of the switch 21 provided in the operation unit 2, and the water supply conduit 34 protrudes in the direction of the insertion portion 3.
[0023]
A screw portion 35 is formed at the end of the cylinder 30 on the opening side, and a cap 36 is screwed into the screw portion 35 from the outside of the casing 27 of the operation portion 2 and is fixed to the casing 27. The base 36 has an upper flange 36 a and a lower flange 36 b, and the lower flange 36 b compresses an O-ring 38 inside an annular groove 37 formed on the inner peripheral surface of the mounting hole 28. Is sealed to prevent gas and liquid from entering the operation unit 2.
[0024]
The piston part 26 has a substantially cylindrical piston body 40 made of a material having rigidity such as metal or synthetic resin. The lower end of the communication passage 41 of the piston body 40 has an opening 42 that opens in the left-right direction. An annular upper abutment 43 and an annular lower abutment are formed at the opening edge of the opening 42. 44 is provided integrally. Furthermore, a projecting shaft portion 45 that projects downward coaxially is integrally provided at the lower end portion of the piston body 40.
[0025]
A first packing support member 46, which will be described later, is fitted on the outer periphery of the piston main body 40 above the upper contact portion 43, and a second packing, which will be described later, is fitted on the protruding shaft portion 45 below the lower contact portion 44. A support member 47 is fitted.
[0026]
A retaining cylinder 48 fitted to the outer periphery of the cylinder body 40 is fitted to the upper portion of the first packing support member 46. The retaining cylinder 48 is made of metal, and a flange portion 49 that is in contact with the end surface of the upper contact portion 43 is integrally provided at the lower end portion, and a screw portion 50 is formed on the inner peripheral surface of the upper end portion. .
[0027]
Further, a finger contact member 52 having a leak hole 51 is screwed and fixed to the screw portion 50 of the retaining cylinder 48. The material of the finger contact member 52 is formed of, for example, modified PPO, PSF, PET, or the like or FRP containing the same as a main component.
[0028]
A cylindrical piston receiving body 53 is fitted to the outside of the retaining cylinder 48. A piston stopper 54 is integrally provided at the lower end portion of the piston receiving body 53 and has a lower surface abutting against the opening end surface of the cylinder 30. The piston stopper 54 and the lower surface of the finger rest member 52 are integrally provided. An urging spring 55 made up of a coil spring is interposed therebetween. That is, the urging spring 55 urges the finger contact member 52 upward, and the piston stopper 54 of the piston receiver 53 abuts against the flange portion 49 of the retaining cylinder 48 in the natural state so that the piston body 40 is moved. Locked.
[0029]
Further, an insulating cover member 56 made of an elastic body, for example, silicon rubber, PVC, EBR or the like, or a mixture thereof is integrally provided on the outside of the piston receiver 53, and the cover member 56 has the base 36. A hook 57 is provided to engage with the upper flange 36a.
[0030]
The finger resting member 52 has an umbrella-like substantially rotating body shape, and the finger resting member 52 is always covered with a gap between the upper end portion of the covering member 56 both in a natural state and in a pushed state. Accordingly, even if liquid is applied to the outside of the finger contact member 52 from above and from the side, the liquid does not enter the inside. Moreover, even when a good conductor is used for the internal organs, it is safe because the finger is not touched directly.
[0031]
Next, the first packing support member 46 and the second packing support member 47 will be described in detail. The first packing support member 46 is divided into an upper member 46a and a lower member 46b having the same outer diameter, and these are formed in a cylindrical shape by a rigid material such as metal or synthetic resin.
[0032]
The upper member 46a and the lower member 46b have an inner diameter that closely fits to the outer peripheral surface of the piston body 40, and the packing 60 is integrated with the annular groove 61 in the outer peripheral portion of the upper member 46a without a gap. The seam is formed smoothly without a step. Similarly, the valve body 62 is formed integrally with the annular groove 63 without a gap on the outer peripheral portion of the lower member 46b, and the joint is smoothly formed without a step. The packing 60 and the valve body 62 are elastically in close contact with the inner peripheral surface of the cylinder 30.
[0033]
Further, the upper member 46a and the lower member 46b are fitted from the upper end side after an adhesive is applied to the outer peripheral surface of the piston body 40 at the time of assembly, and the lower end surface of the lower member 46b is brought into contact with the upper contact portion 43. Touch. Further, after the retaining cylinder 48 is fitted from the upper end side of the piston body 40, the finger resting member 52 is screwed into the screw portion 50 of the retaining cylinder 48, so that the upper member 46 a and the lower member 46 b are It is sandwiched between the abutting portion 43 and the flange portion 49 of the retaining cylinder 48 and bonded and fixed to the piston main body 40.
[0034]
The second packing support member 47 is also divided into an upper member 47a and a lower member 47b having the same outer diameter, which are made of a rigid material such as metal or synthetic resin, and the upper member 47a is cylindrical, and the lower member 47b. Is formed in a bottomed cylindrical shape.
[0035]
The upper member 47a and the lower member 47b have an inner diameter so as to be closely fitted to the outer peripheral surface of the protruding shaft portion 45 of the piston main body 40, and a packing 64 is formed in an annular groove on the outer peripheral portion of the upper member 47a. On the other hand, the packing 66 is integrally formed with the annular groove 67 on the outer peripheral portion of the lower member 47b without a gap, and the joint is smoothly formed without a step. The packings 64 and 66 are elastically in close contact with the inner peripheral surface of the cylinder 30.
[0036]
Also, the upper member 47a and the lower member 47b are fitted from the lower end side after applying an adhesive to the outer peripheral surface of the protruding shaft portion 45 of the piston body 40 at the time of assembly, and the upper end surface of the upper member 47a is lowered to the lower end. It abuts on the contact portion 44 and adheres and fixes to the protruding shaft portion 45.
[0037]
The packings 60, 64, 66 and the valve body 62 are made of rubber. As the rubber, for example, natural rubber or synthetic rubber can be used. As the synthetic rubber, silicon rubber, fluorine rubber, or acrylic rubber can be used. A synthetic resin may be used instead of rubber.
[0038]
Further, as a method for forming the packings 60, 64, 66 and the valve body 62 integrally with the annular grooves 61, 63, 65, 67 without gaps, for example, molding by press vulcanization or rubber lining is preferable. The packings 60, 64, 66 and the valve body 62 may be made of different materials or the same material.
[0039]
Further, the entire circumference of the annular contact surface of the upper member 46a in the flange portion 49 of the retaining cylinder 48 and the first packing support member 46, and the entire circumference of the annular contact surface of the upper member 46a and the lower member 46b. The inner circumferential surfaces of the upper member 46a and the lower member 46b and the entire circumference of the annular contact surface of the piston body 40 and the entire circumference of the annular contact surface of the lower member 46b and the upper contact portion 43 are respectively sealed. 68 is sealed without a gap.
[0040]
Similarly, the entire circumference of the annular contact surfaces of the upper member 47a and the lower contact portion 44 in the second packing support member 47, the entire circumference of the annular contact surfaces of the upper member 47a and the lower member 47b, and the upper member 47a. The entire circumference of the inner peripheral surface of the lower member 47b and the annular contact surface of the projecting shaft portion 45 is sealed without any gap by the sealing means 68, respectively.
[0041]
The sealing means 68 is formed as shown in FIG. 3 when the second packing support member 47 is described as an example. That is, the end surface 69 of the upper member 47 a and the end surface 70 of the lower member 47 b that constitute the second packing support member 47 are in contact with each other, but a minute gap 71 exists between the end surface 69 and the end surface 70. Further, a V-shaped concave portion 72 is formed on the outer side of the contact portion by tapered chamfered portions 69a and 70a formed when burrs or the like are removed. Preferably, the outer shapes of the upper member 47a and the lower member 47b are substantially the same.
[0042]
Sealing means 68 is injected into the gap 71 and the recess 72 and sealed without a gap. That is, the outer peripheral surface of the upper member 47a and the outer peripheral surface of the lower member 47b are formed so as to be smoothly connected without unevenness, and the recess 72 is also embedded so as to be smoothly connected to the outer peripheral surfaces of the upper member 47a and the lower member 47b without unevenness. It has been. Further, the sealing means 68 may be filled in the gap between the second packing support member 47 and the protruding shaft portion 45 of the piston body 40.
[0043]
As the sealing means 68, a filler, an adhesive, a brazing material, or the like is preferable. Silicon rubber can be used as the filler. As the adhesive, an epoxy adhesive, a urethane adhesive, or the like can be used. As the brazing material, solder or brazing can be used. Note that the sealing means 68 may be made of different materials depending on the sealing portion, or all may be made of the same material.
[0044]
Further, the sealing means 68 may be used to fix the piston body 40 and the upper member 46a and the lower member 46b constituting the first packing support member 46 together.
[0045]
Next, the operation of the endoscope channel switching device configured as described above will be described. In the natural state, the piston main body 40 is pushed up by the urging force of the urging spring 55, the gap between the water supply pipe 34 and the water supply pipe 33 is blocked by the seal portion 66 a of the packing 66, and is sent out from the water supply device 14. The flow of liquid from the water pipe 34 toward the water supply pipe 33 is blocked.
[0046]
Further, the gas sent from the air supply device 13 through the flow path in the cylinder 30 formed by the seal portion 64 a of the packing 64 and the seal portion 62 a of the valve body 62 is an opening 42 located on the side surface of the piston main body 40. And flows out from the leak hole 51 of the finger contact member 52 to the atmosphere.
[0047]
In a natural state, when the finger is attached to the leak hole 51 of the finger contact member 52 and closed, the valve element 62 is bent inward by the gas supply pressure from the air supply device 13 and sealed from the inner wall surface of the cylinder 30 to the seal portion 62a. Are separated. As a result, the gas flowing in from the air supply conduit 32 flows out of the air supply conduit 31 through the flow path in the cylinder 30 formed by the seal portion 64 a of the packing 64 and the seal portion 60 a of the packing 60.
[0048]
When the finger resting member 52 is pushed with a finger and the piston body 40 is pushed against the urging force of the urging spring 55 and the leak hole 51 is closed with a finger, the seal portion 62a of the valve element 62 is closed. Is pressed against the tapered surface 30a of the cylinder 30 and becomes airtight, and the gas is blocked from the flow path.
[0049]
On the other hand, the seal portion 66 a of the packing 66 moves to the large diameter portion 30 b of the cylinder 30, and a gap is formed between the inner wall surface of the cylinder 30. As a result, the liquid flowing in from the water supply pipe 34 passes through the flow path in the cylinder 30 formed by the seal portion 64 a and flows out from the water supply pipe 33.
[0050]
Here, the action of the packings 60 and 64.66 accompanying the movement of the piston body 40 will be described with reference to the packing 60 as shown in FIG. That is, when the piston main body 40 moves from the natural state to the pushed-in state (arrow direction) and when the piston main body 40 returns from the pushed-in state to the natural state, the seal portion 60a of the packing 60 It is in sliding contact with the inner surface and receives a force in a direction against the movement of the piston body 40. At this time, since the packing 60 is integrally formed in the annular groove 61 of the upper member 46a with no gap between the A interface 73 and the B interface 74, the natural packing outer shape 75 is deformed like the packing outer shape 76, and the A interface Although a compressive force is applied to 73 and a tensile force is applied to the B interface 74, there is no gap between the A interface 73 and the B interface 74 due to the adhesive action.
[0051]
This is the same action when the piston part 26 is attached to and detached from the cylinder part 25, and no gap is generated between the A interface 73 and the B interface 74. Due to the same action, there is no gap between the valve body 62 and the lower member 46b, the packing 64 and the upper member 47a, and the packing 66 and the lower member 47b during the operation of the piston body 40.
[0052]
In assembling the piston portion 26, the packing 60 and the valve body 62 are fixed to the first packing support member 46, and the packing 64 and packing 66 are fixed to the second packing support member 46 in advance. The packing 60, the valve body 62, the packing 64, and the packing 66 can be fitted to 40 without contacting.
[0053]
As explained above, according to 1st Embodiment, since a clearance gap does not generate | occur | produce in the insertion part to the cylinder part 25 which comprises a pipe line among the piston parts 26, the piston part 26 was extracted from the cylinder part 25. FIG. Even if dust in the atmosphere or dust generated by the human body adheres to the piston portion 26, it does not enter the piston portion 26 and can be easily cleaned. Further, since moisture does not enter the piston portion 26, drying is easy.
[0054]
In the assembly of the piston portion 26, the packing 60, the valve body 62, the packing 64, and the packing 66 do not come into contact with the piston main body 40, and are not damaged at the corners of the rigid body. Can do the work.
[0055]
FIG. 5 shows a second embodiment. This embodiment is a modification of the tip portion of the piston portion 26 of the first embodiment, and other configurations not shown are the same as those of the first embodiment. The packing support member 80 is formed in a bottomed cylindrical shape from a metal or a synthetic resin material, and has an inner diameter that fits closely to the protruding shaft portion 45 of the piston main body 40.
[0056]
On the outer periphery of the packing support member 80, packings 81 and 82 are integrally formed with no gaps with respect to the annular grooves 83 and 84, and the joints are smoothly formed without any step.
[0057]
Note that the upper member 46a and the lower member 46b constituting the first packing support member 46 in the first embodiment may be integrated as in the above embodiment, or the lower member 46b and the second packing support member 47 may be integrated. The upper member 47a may be integrated.
[0058]
The operation is the same as in the first embodiment. Since the number of parts is smaller than that of the first embodiment, the assembly is easy, and there are effects that the working time can be shortened and the labor of the worker can be reduced.
[0059]
FIG. 6 shows a third embodiment. This embodiment is a modification of the tip portion of the piston portion 26 of the first embodiment, and other configurations not shown are the same as those of the first embodiment. A packing support member 86 is provided on the protruding shaft 85 at the lower end of the piston body 40. The packing support member 86 is formed of a metal or a synthetic resin material in a bottomed cylindrical shape, and has an inner diameter that fits closely to the protruding shaft portion 85 of the piston main body 40.
[0060]
Packings 87 and 88 are formed integrally with the annular grooves 89 and 90 without any gaps on the outer peripheral portion of the piston main body 40 and the outer periphery of the packing support member 86, and the joints are smoothly formed without any step. Further, the packing support member 86 is fixed to the piston main body 40 with an adhesive, and the annular contact surface thereof is sealed by the sealing means 68 without any clearance.
[0061]
In addition, any one of the packing 60 and the valve body 62 in the first embodiment may be formed integrally with the piston main body 40 as shown in this embodiment, or the packing 60, the valve body 62, and the packing 64. , 66 may be formed integrally with the piston body 40.
[0062]
According to this embodiment, when adopting a method of forming the packing 87 on the piston body 40 using, for example, a mold, the lower end portion of the piston body 40 does not have an undercut shape. Becomes easier. Furthermore, since the number of parts is smaller than in the first embodiment, assembly is easy, and there are effects of shortening work time and reducing labor of the worker.
[0063]
FIG. 7 shows a fourth embodiment. This embodiment is a modification of the tip portion of the piston portion 26 of the second embodiment, and other configurations not shown are the same as those of the first embodiment. A packing support member 80 is provided on the protruding shaft portion 45 at the lower end of the piston body 40. The packing support member 80 is formed in a bottomed cylindrical shape from a metal or a synthetic resin material, and has an inner diameter that fits closely to the protruding shaft portion 45 of the piston body 40.
[0064]
A cylindrical packing 91 in which the packing 64 and the packing 66 in the first embodiment are integrally formed is formed integrally with the annular groove 92 on the outer peripheral portion of the packing support member 80 without a gap, and the joint is a step. It is formed smoothly. Seal portions 93 and 94 corresponding to the seal portions 64a and 66b of the first embodiment, which are convex portions, are integrally formed on both side edges of the packing 91, respectively.
[0065]
Further, the packing support member 80 is fixed to the piston main body 40 with an adhesive, and the annular contact surface thereof is sealed by the sealing means 68 without any gap. In addition, the packing 60 and the valve body 62 in the first embodiment may be integrally formed as shown in this embodiment, or the valve body 62 and the packing 64 may be integrally formed.
[0066]
According to this embodiment, the joint between the packing 91 and the packing support member 80 is reduced, and a gap due to separation of the joint due to an excessive external force or the like is less likely to occur. As a result, the service life of the piston portion 26 is extended.
[0067]
FIG. 8 shows a fifth embodiment and shows a longitudinal side view of the gas feeding operation device 24. This gas supply operation device 24 has basically the same structure as the air / water supply switching device 22 shown in FIG. 1, and the same components are assigned the same reference numerals and explanations thereof are omitted. The gas supply operation device 24 includes a cylinder part 100 and a piston part 101. The piston 101 has a natural state on the left side and a pressed state on the right side.
[0068]
A gas communicated with a gas supply line 103 which is a gas inlet communicating with the gas supply device 15 and a nozzle 9a of the tip component 9 in order from the top on the side wall of a bottomed cylindrical cylinder 102 constituting the cylinder part 100. A gas supply line 104 serving as an outlet is provided.
[0069]
A second piston main body 106 that also serves as a packing support member is screwed and fixed to a lower end portion of the piston main body 105 constituting the piston portion 101. A packing support member 111 is fitted and fixed to the outer periphery of the piston main body 105, and the packing 107 having a seal portion 107a that is in sliding contact with the cylinder 102 is integrally formed with the annular groove 108 without a gap on the outer periphery of the packing support member 111. The seam is formed smoothly without a step.
[0070]
A packing 109 having a seal portion 109a slidably contacting the cylinder 102 is integrally formed on the outer periphery of the second piston main body 106 with no gap with respect to the annular groove 110, and the joint is smoothly formed without a step. .
[0071]
In the gas supply operation device 24, the piston body 105 and the finger contact member 52 are not provided with the leak hole 51 and the opening 42 communicating with the air supply / water supply switching device 22. It is separated from the outside by a packing 107 in a watertight and airtight manner.
[0072]
In the natural state, the packing 109 separates the gas supply line 103 and the gas supply line 104 in a watertight and airtight manner, and the two do not communicate with each other. In a state where the piston main body 105 is pushed in, the packing 109 moves downward from the gas feed pipe 104, and the gas feed pipe 103 and the gas feed pipe 104 are connected to the inner surface of the cylinder 102, the seal portion 107 a of the packing 107, and the packing 109. The fluid is formed by a fluid passage formed by the seal 109a. The gas delivered from the gas delivery device 15 is delivered from the nozzle 9a of the tip component 9 via the gas delivery operation device 24. Other operations are the same as those of the air / water supply switching device 22.
[0073]
According to this embodiment, since the piston main body 105 and the second piston main body 106 which is a packing support member are screwed together in addition to the same effects as those of the air / water supply switching device 22, the fixing is ensured and the bonding is performed. The fixing work becomes easier.
[0074]
According to the above-described embodiment of the present invention, the following configuration can be obtained.
1. In an endoscope channel switching device for switching a pipeline disposed in an endoscope, the piston is inserted into a piston body made of a rigid body. A packing support member made of a fixed rigid body, a packing made of an elastic body integrally formed with the packing support member and in close contact with the cylinder, and at least an outer side of a joint surface between the piston body and the packing support member An endoscope conduit switching device comprising sealing means for sealing without a gap.
[0075]
2. The endoscope channel switching device according to claim 1, comprising a plurality of the packings and packing support members.
[0076]
3. The endoscope channel switching device according to claim 1 or 2, wherein the packing support member is fitted to the piston body. 4). The endoscope channel switching device according to claim 2, wherein the packing support member is fitted from both ends of the piston body.
[0077]
5. The endoscope channel switching device according to claim 1 or 2, wherein the piston body has a communication path.
[0078]
6). The endoscope channel switching device according to claim 1 or 2, wherein at least one of the packings is a check valve that allows fluid to pass in one direction but not in the opposite direction.
[0079]
7). The endoscope channel switching device according to claim 1 or 2, wherein the packing support member is screwed into the piston body.
[0080]
8). The endoscope channel switching device according to claim 1 or 2, wherein the piston body also serves as a packing support member.
[0081]
9. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is an adhesive.
[0082]
10. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is a brazing material.
[0083]
11. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is wax.
[0084]
12 The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is solder.
[0085]
13. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is a sealing material.
[0086]
14 The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is rubber.
[0087]
15. The endoscope channel switching device according to claim 1 or 2, wherein the packing is made of rubber.
[0088]
16. The endoscope channel switching device according to claim 1 or 2, wherein the packing is made of synthetic resin.
[0089]
17. The endoscope channel switching device according to claim 1 or 2, wherein the packing support member is made of metal.
[0090]
18. The endoscope channel switching device according to claim 1 or 2, wherein the packing support member is made of synthetic resin.
[0091]
19. The endoscope channel switching device according to claim 1 or 2, wherein the packing support member is made of ceramic.
[0092]
20. The endoscope channel switching device according to claim 1 or 2, wherein the piston body is made of metal.
[0093]
21. The endoscope channel switching device according to claim 1 or 2, wherein the piston body is made of synthetic resin.
[0094]
22. The endoscope channel switching device according to claim 1 or 2, wherein the piston body is made of ceramic.
[0095]
23. The endoscope channel switching device according to claim 1 or 2, wherein the packing is made of natural rubber.
[0096]
24. The endoscope channel switching device according to claim 1 or 2, wherein the packing is made of silicon rubber.
[0097]
25. The endoscope channel switching device according to claim 1 or 2, wherein the packing is made of fluororubber.
[0098]
26. The endoscope channel switching device according to claim 1 or 2, wherein the packing is made of acrylic rubber.
[0099]
27. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is fusion.
[0100]
28. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is welding.
[0101]
29. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is an epoxy resin adhesive.
[0102]
30. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is an acrylic resin adhesive.
[0103]
31. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is a silicone rubber adhesive.
[0104]
32. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is a polyurethane rubber adhesive.
[0105]
33. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is a silicon rubber sealant.
[0106]
34. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is ultrasonic welding.
[0107]
35. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is heat sealing.
[0108]
36. The endoscope channel switching device according to claim 1 or 2, wherein the sealing means is a combination of two or more means of ultrasonic welding and thermal fusion.
[0109]
37. The endoscope channel switching device according to claim 1 or 2, wherein a material of the packing is a combination of two or more of natural rubber, silicon rubber, fluorine rubber, and acrylic rubber.
[0110]
38. The endoscope channel switching device according to claim 1 or 2, wherein a material of the packing support member is a combination of two or more of synthetic resin, metal, and ceramic.
[0111]
39. 6. The endoscope channel switching device according to claim 5, wherein the piston main body has a communication path that connects a plurality of channels that are connected to the cylinder and communicate with each other in the cylinder.
[0112]
40. The endoscope channel switching device according to claim 1 or 2, wherein the packing is provided integrally with a packing support member by rubber lining.
[0113]
41. The endoscope channel switching device according to claim 1 or 2, wherein the packing is formed integrally with an annular groove formed in an outer peripheral portion of the packing support member without a gap.
[0114]
42. In an endoscope air / water supply switching device that includes a cylinder and a piston that is inserted into the cylinder so as to be able to advance and retreat, and that switches a pipeline disposed in the endoscope, the piston is fixed to the piston body. The packing support member, the packing made of an elastic body integrally formed with the packing support member and in close contact with the cylinder, and at least the outer side of the joint surface between the piston body and the packing support member are sealed without gaps. An endoscopic air / water supply switching device comprising a sealing means.
[0115]
43. In an endoscope gas supply switching device that includes a cylinder and a piston that is inserted into the cylinder so as to be movable back and forth, and that switches a pipeline disposed in the endoscope, the piston is fixed to the piston body. A seal that seals at least the outer side of the joint surface between the piston main body and the packing support member without any gap, and a packing support member, a packing made of an elastic body integrally formed with the packing support member and in close contact with the cylinder. An endoscopic gas supply switching device comprising: a stop means.
[0116]
44. The endoscope channel switching device according to claim 5, wherein the communication path communicates between the inside and the outside of the cylinder.
[0117]
45. 3. The endoscope channel switching device according to claim 1 or 2, wherein the packing has a cylindrical shape and has seal portions formed of annular convex portions at both edge portions thereof.
[0118]
According to the above-described items 1 to 8, 39 to 44, when the piston main body advances and retracts, the packing slides and deforms with respect to the inner surface of the cylinder. The packing is formed integrally with the packing support member without any gap, and no gap is generated between the packing and the packing support member even if the packing is deformed. Since the packing support member and the piston main body are fixed and both are rigid bodies, even if an external force is applied by moving the piston up and down, the distance between the joint surfaces does not change, and no compression force or tensile force is applied to the sealing means. Therefore, the sealing means does not cause peeling.
[0119]
When assembling the piston part, the work of fixing the packing support member to the piston body is performed. The packing is attached to the piston main body via a packing support member made of a rigid body that is integrally formed, and does not contact the piston main body. When a force is applied to the packing support member during the operation, the packing support member is a rigid body, so that it does not deform and no force is applied to the packing.
[0120]
Accordingly, since no gap is generated in the piston body when the piston body moves back and forth, the dirt does not enter the inside of the piston body but adheres to the surface, and moisture does not enter the inside of the piston body. Therefore, the dirt adhering to the piston main body is only the outer surface, and can be easily cleaned and dried quickly. Therefore, the time and labor required for the cleaning work are reduced, and the burden on the operator is reduced. In addition, since the packing is not accidentally damaged when the piston portion is assembled, the work does not require skill and the work can be performed in a short time. Therefore, the time and labor required for the assembly work are reduced, and the burden on the operator is reduced.
[0121]
According to the ninth to twelfth, twenty-seventh to thirty-two, thirty-four, thirty-four, and thirty-fifth aspects, the packing support member and the piston main body are fixed to each other through the sealing means. Since the packing support member and the piston main body are fixed by the sealing means, the fixing strength between the packing support member and the piston main body can be increased. Furthermore, the sealing means can also serve as the fixing means.
[0122]
According to the thirteenth and thirty-third items, the sealing means maintains flexibility after being applied or filled on the joint surface between the packing support member and the piston body, and adheres to the packing support member and the piston body by a relatively weak binding force. ing. Therefore, the sealing means can be easily removed. For example, when the sealing means is applied excessively, it can be easily wiped off, and the assembled piston body is not wasted, which is economical.
[0123]
According to the fourteenth aspect, even if the packing support member or the piston main body is deformed and the gap between the joint surfaces is changed, the sealing means is greatly elastically deformed to follow the deformation of the joint surface. Even when the packing support member or the piston body is damaged, there is no gap in the joint surface, so dirt does not enter the inside of the piston body, so it can be easily cleaned and the air supply / water supply function should not be hindered. In this case, the piston body can be used as it is.
[0124]
According to the fifteenth aspect, when the piston main body is eccentric with respect to the cylinder and the distance between the piston main body and the cylinder is changed, the packing is highly flexible because the packing is highly flexible, and keeps contact with the cylinder, A seal between the piston body and the cylinder is maintained. Thereby, the pipeline switching is performed reliably.
[0125]
According to the sixteenth aspect, when a strong force is applied to the packing, the packing has a small deformation amount, the distance between the piston body and the cylinder is maintained, and the packing can be given high strength and high wear resistance. The volume of the pipe formed by the piston main body, the cylinder, and the packing does not change, and a fluid passage is secured.
[0126]
According to the seventeenth item, the packing support member can be given high strength, and the packing support member is hardly damaged.
[0127]
According to the eighteenth item, the packing support member can be reduced in weight.
[0128]
According to the nineteenth aspect, the packing support member can be provided with high rigidity and high wear resistance.
[0129]
According to the twentieth item, the piston main body can be given high strength. According to the twenty-first item, the piston body can be reduced in weight. According to the twenty-second item, the piston body can be provided with high rigidity and high wear resistance.
[0130]
According to the 23rd item, packing is made inexpensive. According to the 24th item, chemical resistance, heat resistance, aging resistance and cold resistance of the packing can be increased. According to the 25th item, chemical resistance, heat resistance, aging resistance and oil resistance of the packing can be increased. According to the twenty-sixth item, the heat resistance and oil resistance of the packing can be increased.
[0131]
According to the thirty-sixth aspect, when the kind or temperature of the fluid that contacts each sealing portion is different, the sealing means can be made of a material that does not easily deteriorate corresponding to each. According to the thirty-seventh aspect, when the kind or temperature of the fluid contacting each packing is different, each packing can be made of a material having a high sealing ability corresponding to each fluid. According to the thirty-eighth aspect, when the amount of force applied varies depending on the mounting position of each packing support member, the strength of each packing support member can be changed.
[0132]
According to the forty-fifth aspect, a plurality of seal portions can be provided on the packing, and the assembly of the packing with the piston body is facilitated.
[0133]
In addition, a fluid ejection nozzle that can supply air or water toward an observation window or the like is provided at the distal end of an electronic endoscope having a solid-state image sensor or an endoscope having an image guide fiber. It has been.
[0134]
For example, Japanese Patent Laid-Open No. 3-165731 shows a conventional nozzle structure, in which a nozzle protective material made of epoxy resin is integrally formed on a nozzle by casting, and a screw is attached to a nozzle mounting hole provided in a tip component portion. It is fixed so that it can be attached and detached at the time of repair with a low-temperature curable rubber (silicon soft adhesive). However, the epoxy resin was not applied to the deformed portion of the nozzle mouth throat portion, and was only an unformed round pipe portion on the nozzle base side.
[0135]
Therefore, it is difficult to reliably pour the low-temperature curable rubber (silicone soft adhesive) into the deformed portion of the nozzle mouth throat portion without any gap, and since the fluidity is poor, it is difficult to confirm whether there is no gap.
[0136]
Also, the low-temperature curable rubber applied near the nozzle opening end is rubbed with a material harder than a brush or other low-temperature curable rubber, and the surface is dug to become a concave or rough surface. It was easy to deteriorate. Furthermore, dirt was accumulated in the deteriorated part, and it took time and effort to clean. In addition, there has been a problem that the quality of the workers is not stable even during repairs and shipments due to large variations among workers.
[0137]
Accordingly, in order to solve the above-described problem, the nozzle structure shown in FIGS. 9 to 11 was developed. 9 to 11 show a sixth embodiment, FIG. 9 is a longitudinal side view of the distal end configuration portion of the endoscope, FIG. 10 is a view taken in the direction of the arrow X in FIG. 9, and FIG. It is sectional drawing which follows the -Y line.
[0138]
The distal end configuration portion 120 of the endoscope has a distal end portion main body 121 made of metal or insulating plastic, and a connection hole 122 is formed in the proximal end portion of the distal end portion main body 121. A connection pipe 123 made of metal or plastic is inserted into 122 and is watertightly fixed with a hard adhesive 124 or the like. A fluid conduit 125 made of PTFE or the like extending to an operation portion (not shown) of the endoscope is fixed to the connecting tube 123 in a watertight manner by a thread-binding adhesive means 126.
[0139]
An opening recess 127 is provided at the tip of the tip body 121, and a nozzle 128 is fixed to the opening recess 127. That is, reference numeral 129 denotes a nozzle body made of a metal shaped pipe, and a nozzle support member 131 made of a hard insulating adhesive is provided on the outer periphery of the nozzle body 129 over the throat portion 130, for example, an epoxy adhesive. And the like are integrally formed by casting, so that a nozzle 128 is formed. The nozzle 128 is fitted and fixed to the opening recess 127.
[0140]
The casting integral molding of the nozzle support member 131 is molded in accordance with a predetermined molding die (not shown), and the shape thereof is the same as the opening concave portion 127 provided in the distal end portion main body 121. The inner diameter of the lower end protrusion 129 a of the nozzle body 129 of the nozzle 128 is formed to be substantially the same as the inner diameter of the connecting pipe 123.
[0141]
Moreover, the outer diameter of the lower end protruding portion 129a of the nozzle body 129 and the inner diameter of the lower end portion 127a of the opening recess 127 of the tip end body 121 are provided so as to be fitted. The nozzle 128 has a gap filled in the opening recess 127 with a silicon-based soft adhesive 132 and is fixed in a watertight manner. In addition, a side hole 134 is formed in the side surface portion 133 of the distal end portion main body 121, and a metal pin 136 having a slit is inserted into the concave portion 135 provided in the nozzle support member 131. The space of the side hole 134 after insertion is filled with a silicon-based soft adhesive 132 to prevent the pin 136 from coming off.
[0142]
In addition, after the nozzle 128 is watertightly fixed to the opening recess 127 with the silicon-based soft adhesive 132, as shown in FIG. 11, a slight gap is filled with the soft adhesive 132 without any gaps. .
[0143]
The silicon-based soft adhesive 132 is applied and dropped onto the outer periphery of the lower end protrusion 129a of the nozzle 128 and the outer periphery of the nozzle support member 131, which are formed by the molding die in the opening recess 127 of the tip body 121, and then the tip part A pin 136 is fitted into the recess 135 of the nozzle support member 131 from the side surface 133 and the side hole 134 of the main body 121, and is filled with a silicon-based soft adhesive 132 so that the pin 136 does not fall off. Next, as shown in FIG. 11, the gap is covered with a silicone-based soft adhesive 132 by repair coating of the nozzle 128 protruding from the tip end body 121. At the time of repair, the silicon adhesive 132 in the side hole 134 in the side surface 133 of the tip body 121 is taken out with a tool or the like, the pin 136 is taken out, and the nozzle 128 is taken out from the opening recess 127. Then, the inner surface of the opening recess 127 and the lower end portion 127a thereof is cleaned with a cleaning brush (not shown), and a new nozzle 128 is mounted in the order described above.
[0144]
As described above, since the nozzle 128 is pre-molded and the deformed portion can be cast and integrally formed with the nozzle support member 131 made of a hard insulating adhesive, there is no gap due to the variation of the operator, and the operation is simple. Moreover, the repair is easy, and the working time and labor can be reduced. In addition, since there is no deterioration due to the use of the adhesive part and no dirt is accumulated, the cleaning performance is excellent. Even after the nozzle 128 is removed, the step at the lower end portion 127a of the tip end body 121 is a tapered portion, so that the inside of the tip end portion body 121 is excellent in cleanability.
[0145]
In this embodiment, the outer surface of the tip constituent part is composed of a tip part main body 121, a nozzle main body 129 made of a deformed pipe, and a nozzle support member 131 made of a hard insulating adhesive. There is little damage and wear even in use.
[0146]
Alternatively, the nozzle support member 131 may cover the entire outer surface of the nozzle body 129, and the tip body 121 and the nozzle support member 131 may be configured. By making both of them insulative, the distal end configuration portion of the endoscope is completely insulated.
[0147]
According to the embodiment described above, the following configuration is obtained.
[0148]
1. In an endoscope in which a nozzle for fluid ejection is provided at the distal end main body of the endoscope, the nozzle includes a nozzle main body having a flow path therein and a hard nozzle support member that covers at least a part of the outer surface of the nozzle main body. The tip body has an opening recess corresponding to the outer shape of at least a part of the nozzle support member, the nozzle is detachably inserted and fixed in the opening recess, and the outer surface of the tip of the endoscope is fixed. An endoscope composed of a tip body and a nozzle body and a nozzle support member or a tip body and a nozzle support member.
[0149]
2. The endoscope according to claim 1, wherein the nozzle support member is made of resin.
[0150]
3. The endoscope according to claim 2, wherein the nozzle support member is fixed to the nozzle body without a gap.
[0151]
4). The endoscope according to claim 3, wherein the nozzle support member is integrally formed with the nozzle body.
[0152]
5. The endoscope according to claim 1, wherein at least the opening concave portion of the tip body is made of resin.
[0153]
6). The endoscope according to claim 1, wherein the space between the tip body and the nozzle is filled with a filler.
[0154]
7). The endoscope according to claim 6, wherein the filler is a soft resin.
[0155]
8). The endoscope according to claim 7, wherein the filler is a silicon-based adhesive.
[0156]
9. The endoscope according to claim 1, wherein the nozzle support member and the distal end main body are each provided with an insertion hole for the retaining member or an insertion recess for the retaining member, and the retaining member is inserted into both.
[0157]
According to the 1st term, the operation | work which eliminates the clearance gap of the outer surface of a front-end | tip part main body becomes easy. Moreover, since the nozzle support member is hard, it does not deteriorate even during long-term use, and has excellent resistance. Moreover, since the surface of the nozzle support member is kept in the initial state, it is easy to clean and dirt is not easily collected. In addition, since a nozzle part with a gap filled in advance can be created and stocked at the time of repair, it is possible to omit the work of filling the gap in the nozzle deformed part during use. Moreover, there is no variation by an operator, and quality can be stabilized.
[0158]
According to the second item, since the nozzle support member is made of resin, the insulation and shape of the nozzle can be arbitrarily formed.
[0159]
According to the third item, since the nozzle support member is fixed to the nozzle body without any gaps, no dirt enters between the nozzle support member and the nozzle body.
[0160]
According to the fourth aspect, since the nozzle support member is integrally formed with the nozzle body, there is no gap, dirt is not entered, and the nozzle support member can be easily formed.
[0161]
According to the fifth aspect, at least the opening concave portion of the distal end portion main body is made of resin, so that the shape can be arbitrarily formed.
[0162]
According to the sixth item, since the space between the tip body and the nozzle is filled with the filler, no dirt enters.
[0163]
According to the seventh item, since the filler is a soft resin, the repair is easy.
[0164]
According to the eighth item, since the filler is a silicon adhesive, it has chemical resistance.
[0165]
According to the ninth aspect, the nozzle support member and the tip body are each provided with an insertion hole for the retaining member or an insertion recessed portion for the retaining member, and the retaining member is inserted into both, so that the retaining member can be securely removed. A stop effect can be obtained and downsizing can be achieved.
[0166]
【The invention's effect】
As described above, the present invention has the following effects.
[0167]
a. It is easy to eliminate the gap on the outer surface of the tip body.
[0168]
b. Since the nozzle support member is hard, it does not deteriorate even during long-term use and has excellent resistance.
[0169]
c. Since the surface of the nozzle support member is kept in the initial state, it is easy to clean and dirt is not easily collected.
[0170]
d. A nozzle part with a gap filled in advance can be created and stocked at the time of repair, so that the work of filling the gap in the nozzle deformed part during use can be omitted.
[0171]
e. There is no variation among workers, and quality can be stabilized.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of an endoscope duct switching device showing a first embodiment of the present invention.
FIG. 2 is a configuration diagram of the entire endoscope apparatus according to the embodiment.
FIG. 3 is an enlarged vertical side view showing a part of the packing support member of the embodiment.
FIG. 4 is an enlarged vertical side view showing a part of the packing according to the embodiment.
FIG. 5 is an enlarged vertical side view showing a part of a packing support member according to a second embodiment of the present invention.
FIG. 6 is an enlarged vertical side view showing a part of a packing support member according to a third embodiment of the present invention.
FIG. 7 is an enlarged vertical side view showing a part of a packing support member according to a fourth embodiment of the present invention.
FIG. 8 is a longitudinal side view of an endoscope duct switching device showing a fifth embodiment of the present invention.
FIG. 9 is a longitudinal side view of a distal end constituting portion of an endoscope showing a sixth embodiment of the present invention.
10 is a view as seen from an arrow X direction in FIG. 9;
11 is a cross-sectional view taken along line YY in FIG.
[Explanation of symbols]
121 ... tip body
127 ... Opening recess
128 ... Nozzle
129 ... Nozzle body
131 ... Nozzle support member

Claims (2)

In an endoscope in which a nozzle for fluid ejection is provided on the distal end body of the endoscope,
Wherein the nozzle is formed internally has a flow passage, and a nozzle body having a profile portion comprising a base side and a throat which different shapes of the nozzle, at least the distal end section body and the profiled portion of the nozzle body It consists of a hard nozzle support member that is formed integrally with the nozzle body in advance before it is incorporated into the tip body so as to fill the gap, covering at least the outer peripheral part of the deformed part of the nozzle body. ,
The tip body has an opening recess corresponding to the outer shape of at least a part of the nozzle support member;
The endoscope is characterized in that the nozzle is detachably inserted and fixed in the opening recess, and the outer surface of the distal end portion of the endoscope is composed of at least the distal end portion main body and the nozzle support member. The endoscope according to claim 1 , wherein the nozzle is formed by integrally molding the nozzle support member made of an epoxy adhesive into the nozzle body by casting .

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