CN106667421B - A kind of fluid channel valve, fluid channel switching valve and endoscope - Google Patents
A kind of fluid channel valve, fluid channel switching valve and endoscope Download PDFInfo
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- CN106667421B CN106667421B CN201510757382.7A CN201510757382A CN106667421B CN 106667421 B CN106667421 B CN 106667421B CN 201510757382 A CN201510757382 A CN 201510757382A CN 106667421 B CN106667421 B CN 106667421B
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- valve
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Abstract
The invention discloses a kind of fluid channel valves, including valve bonnet, valve rod, valve plug；The valve bonnet accommodates the valve rod, different height is provided with fluid inlet and fluid outlet on the valve bonnet, the valve plug is fixedly arranged in the valve bonnet, and for the height of the valve plug between the fluid inlet and the fluid outlet, other positions of the valve bonnet are sealing state；The valve plug is looped around around the valve rod, the access that the valve plug can be made to communicate up and down is equipped between the valve rod, the end of the valve rod has a sealing, the valve rod can not be constituted sealing to the access by when external force, when the valve rod moves down under external force, the access is opened.Fluid channel valve mechanism of the invention is simple, easy to operate.The present invention also provides a kind of fluid channel switching valves comprising the fluid channel valve, and the endoscope using the fluid channel switching valve.
Description
Technical field
The present invention relates to field of mechanical technique more particularly to a kind of fluid channel valve, fluid channel switching valve, Yi Jiyi
Kind uses the endoscope of the valve.
Background technique
Endoscopic system is widely adopted in medical diagnosis.Endoscopic system in body cavity by being inserted into elongated insertion
Portion can observe endoceliac internal organs etc., as needed using the processing utensil being inserted into insertion channel, can carry out various
Treatment processing.Endoscope is additionally provided with cleaning, treatment for being disposed portion in body cavity, or expands body cavity and expand observation
The liquid feeding device of supplying gas in the visual field can be sent into water, medical fluid, air etc. into body cavity as needed.
It in the liquid feeding device of supplying gas of endoscope, requires to use a kind of fluid channel switch valve, for sending water and sending
Switch between gas, and do not bother to see me out water and it is unaspirated when close water out, gas exit passageway, valve needs are accurately controlled
Switch conveying to water, gas, and needs operating characteristics good, durable.There is the fluid channel of various structures to cut in the prior art
Valve is changed, but usually components are too many, structure is complicated, and cause operating characteristics bad, such as surround multiple sealing rings on valve rod,
So that frictional force is larger between valve rod and valve bonnet when operation, operation is after smoothness is bad or long-time operation, part stability
It is bad.
Summary of the invention
The present invention provides a kind of fluid channel valve, is realized with simple structure to access between fluid inlet and fluid outlet
Be open and shut off control；And fluid channel switching valve, for realizing cutting between three fluid channels by simple structure
It changes.The present invention also provides a kind of endoscope, aspirated and water sending system uses fluid channel switching valve of the invention, and realization is internally peeped
Mirror send the accurate control that water is supplied gas.
The technical scheme is that
A kind of fluid channel valve, including valve bonnet, valve rod, valve plug；
The valve bonnet accommodates the valve rod, and different height is provided with fluid inlet and fluid outlet on the valve bonnet, described
Valve plug is fixedly arranged in the valve bonnet, and the height of the valve plug is between the fluid inlet and the fluid outlet, the valve
Other positions of cover are sealing state；
The valve plug is looped around around the valve rod, and the valve plug or more can be made by being equipped between the valve rod
The end of the access communicated, the valve rod has a sealing, and the valve rod can not constituted the access by when external force
Sealing, when the valve rod moves down under external force, the access is opened.
A kind of fluid channel switching valve, comprising:
Valve bonnet, valve rod, button, valve plug；
The valve bonnet accommodates the valve rod, the valve bonnet inner wall ring week is provided with step, sets from top to bottom on the valve bonnet
It is equipped with first outlet, first entrance, second outlet, second entrance, and the first outlet is located at the top of the step, it is described
First entrance, second outlet, second entrance are located at the lower section of the step；
Have a through-hole in the valve rod, the through-hole includes the longitudinal sections that upper end is connected with the button, and with it is described
The traversing section of longitudinal sections connection, the traversing section extend transversely through the valve rod, so that the inner cavity of the through-hole and the valve bonnet connects
It is logical；
The button is located at the top of the valve rod, is connected with the longitudinal sections of the through-hole, and the button is equipped with will
The aperture that the through-hole is connected with ambient atmosphere；
The outer wall of the valve rod is surrounded with the first sealing ring, gasket, the second sealing ring, first sealing from top to bottom
Circle, the second sealing ring are annular resilient object, and the height of first sealing ring is located at the button hereinafter, the first outlet
More than, and hermetic abut the inner wall of the valve bonnet；The height of the gasket is located at the first outlet hereinafter, described
It is more than rank；The gasket has cricoid sealing ring and bottom is integrally formed with the sealing ring, periphery extends obliquely upward
Leather cup；There are gaps between the sealing ring and the inner wall of the valve bonnet, and can be under button effect with the valve rod
It is displaced downwardly to and is sealed against with the step, the leather cup hermetic abuts the inner wall of the valve bonnet, and the edge of the leather cup holds
Easily deform under external force；The height of second sealing ring is located at the first entrance hereinafter, more than the second outlet,
And hermetic abut the inner wall of the valve bonnet；
The height of the traversing section of through-hole in the valve rod is located at the gasket hereinafter, more than second sealing ring,
So that the through-hole is connected to the first entrance；
The valve plug is embedded in the valve bonnet, and the height of the valve plug is in the second outlet hereinafter, described second enters
Mouthful or more, the valve plug is looped around around the valve rod, and the valve plug or more can be made by being equipped between the valve rod
The end of the access communicated, the valve rod has a sealing, and the valve rod can not lead to the valve plug by when external force
Road constitutes sealing, and when the valve rod moves down under the action of the button, the access is opened.
The invention has the advantages that the switching between three fluid channels is realized by simple structure, so that interior peep
Mirror, which can be controlled accurately, send water to supply gas, and operating characteristics is good, durable.
Detailed description of the invention
Fig. 1 is the diagrammatic cross-section of fluid channel valve of the present invention.
Fig. 2 is the schematic perspective view for the valve plug that fluid channel valve of the present invention uses.
Fig. 3 is the perspective exploded view of fluid channel switching valve first embodiment of the present invention.
Fig. 4 is the diagrammatic cross-section of fluid channel switching valve first embodiment of the present invention.
Fig. 5 is the diagrammatic cross-section of another state of fluid channel switching valve first embodiment of the present invention.
Fig. 6 is the embodiment schematic perspective view for the valve plug that fluid channel switching valve first embodiment of the present invention uses.
Fig. 7 is the stereochemical structure for another angle of valve plug embodiment that fluid channel switching valve first embodiment of the present invention uses
Schematic diagram.
Fig. 8 is the diagrammatic cross-section of the fluid channel switching valve of fluid channel switching valve second embodiment of the present invention.
Specific embodiment
Below in conjunction with the Figure of description in the present invention, the technical solution in invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the scope of protection of the invention.
As shown in Figure 1, fluid channel valve of the invention, including valve bonnet 101, valve rod 102, valve plug 103；
Valve bonnet 101 accommodates valve rod 102, and different height is provided with fluid inlet 104 and fluid outlet 105, valve on valve bonnet 101
Plug 103 is fixedly arranged in valve bonnet 101, the height of valve plug 103 between fluid inlet 104 and fluid outlet 105, valve bonnet 101
Other positions are sealing state；
Valve plug 103 is looped around around valve rod 102, and being equipped between valve rod 102 can be such that about 103 valve plug communicates
Access, the end of valve rod 102 has a sealing 106, and valve rod 102 is not close by that can constitute to the access when external force
Envelope, the access between fluid inlet 104 and fluid outlet 105 is cut off, when valve rod 102 moves down under external force, fluid
Access between entrance 104 and fluid outlet 105 is opened.
Valve plug 103 has and and can cooperatively form with valve rod 102 described with the lower section 107 of 106 close fit of sealing
The upper section 108 of access.
As depicted in figs. 1 and 2, the upper section 108 of valve plug 103 has scraggly upper surface, has one to stop on valve rod 102
Stopper 109, after valve rod 102 moves down under external force, stopper section 109 is abutted with the upper surface, described scraggly
Upper surface constitutes a part of the access.
In some embodiments, the cooperation between sealing 106 and the lower section 107 of valve plug 103 is arranged to: working as sealing
After 106 move down certain distance with valve rod 102, the access is just opened.Specific structure can be, in 106 upper end of sealing or
The extended segment of one section with 103 close fit of valve plug is arranged in lower end, when valve rod 102 is moved down under external force so that the extended segment
When completely disengaging the close fit with valve plug 103, the access is just opened.
Referring to Fig. 3, Fig. 4, the fluid channel switching valve of first embodiment of the invention, comprising:
Valve bonnet 1, valve rod 2, button 3, valve plug 4；
Valve bonnet 1 accommodates valve rod 2,1 inner wall ring week of valve bonnet is provided with step 10, is provided with first from top to bottom on valve bonnet 1 and goes out
Mouth 6, first entrance 5, second outlet 8, second entrance 7, and first outlet 6 is located at the top of step 10, first entrance 5, second
Outlet 8, second entrance 7 are located at the lower section of step 10；
Have a through-hole 11 in valve rod 2, through-hole 11 includes the longitudinal sections 12 that upper end is connected with button 3, and with longitudinal sections 12
The traversing section 13 of connection, traversing section 13 extend transversely through valve rod 2, so that through-hole 11 is connected to the inner cavity of valve bonnet 1；
Button 3 is located at the top of valve rod 2, is connected with the longitudinal sections 12 of through-hole 11, and button 3 is equipped with by through-hole 11 and outside
The aperture 14 that boundary's atmosphere is connected；
The outer wall of valve rod 2 is surrounded with the first sealing ring 15, gasket 16, the second sealing ring 17, the first sealing from top to bottom
The 15, second sealing ring 17 of circle is annular resilient object, the height of the first sealing ring 15 be located at button 3 hereinafter, first outlet 6 with
On, and hermetic abut the inner wall of valve bonnet 1；The height of gasket 16 is located at first outlet 6 hereinafter, 10 or more step；Sealing
The leather cup 19 that pad 16 has cricoid sealing ring 18 and bottom and sealing ring 18 is integrally formed, periphery extends obliquely upward；Sealing
There are gaps between ring 18 and the inner wall of valve bonnet 1, and can be displaced downwardly under the effect of button 3 with valve rod 2 and seal against with step 10,
Leather cup 19 hermetic abuts the inner wall of valve bonnet 1, and the edge of leather cup 19 is easy to deform under external force；Second sealing ring 17
Height is located at first entrance 5 hereinafter, 8 or more second outlet, and hermetic abuts the inner wall of valve bonnet 1；
The height of the traversing section 13 of through-hole 11 in valve rod 2 is located at gasket 16 hereinafter, the second 17 or more sealing ring, so that
Through-hole 11 is connected to first entrance 5；
Valve plug 4 is embedded in valve bonnet 1, and the height of valve plug 4 is in second outlet 8 hereinafter, 7 or more second entrance, valve plug 4 are surround
Around valve rod 2, the access that about 4 valve plug can be made to communicate is equipped between valve rod 2, the end of valve rod 2 has one
Sealing 20, when valve rod 2 is not by external force, sealing 20 can constitute the access of valve plug 4 and seal, when valve rod 2 is being pressed
When moving down under the action of button 3, the access is opened.
Below with reference to Fig. 4 and Fig. 7, the course of work of fluid channel switching valve of the present invention is introduced.
One of fluid channel switching valve of the invention, can select to perform the following operation respectively: enter institute from first entrance 5
The first fluid for stating switching valve is discharged to the external world；Enter the first fluid of the switching valve from 6 row of first outlet from first entrance 5
Out；The second fluid for entering the switching valve from second entrance 7 is discharged from second outlet 8.
When first fluid enters the switching valve from first entrance 5, it is closed in the leather cup 19 and second of gasket 16
Between sealing ring 17, completely cut off with first outlet 6, second entrance 7 and second outlet 8, cross of the first fluid from through-hole 11
Enter longitudinal sections 12 to section 13, is discharged to the external world from the aperture 14 on button 3.The sealing 20 of 2 end of valve rod closes valve at this time
The access of about 4 plug, so that second entrance 7 is isolated with first entrance 5, first outlet 6, second outlet 8.
When operator closes the aperture 14 on button 3, the first fluid entered from first entrance 5 can not be from small
Hole 14 is discharged to the external world, under Fluid pressure effect, squeezes the leather cup 19 of gasket 16, since leather cup 19 is easily to be deformed
Structure, therefore leather cup 19 of the first fluid after being deformed into the space of 19 top of leather cup, and be closed in the
Between one sealing ring 15 and the second sealing ring 17, it is discharged from first outlet 6.The sealing 20 of 2 end of valve rod closes valve plug 4 at this time
Upper and lower access, so that second entrance 7 is isolated with first entrance 5, first outlet 6, second outlet 8.
When operator closes the aperture 14 on button 3, and presses lower button 3, valve rod is moved down into position shown in Fig. 7
It sets, the first sealing ring 15 is still located on the top of first outlet 6, and the sealing ring 18 of sealing ring 16 is displaced downwardly to be supported with the sealing of step 10
Connect, the second sealing ring 17 is still located between first entrance 5 and second outlet 8, the sealing 20 of the end of valve rod 2 move down so that
The access that about 4 valve plug communicates is opened.First entrance 5 is isolated by sealing ring 18 and the second sealing ring 17 at this time, first fluid
Switching valve can not be discharged by first outlet 6, second outlet 8 or second entrance 7, can not be also discharged to by through-hole 11 outer
Boundary.At this point, second fluid enters switching valve from second entrance 7, the access through about 4 valve plug reaches second outlet 8, and by second
The isolation of sealing ring 17 is in the second sealing ring 17 hereinafter, being discharged from second outlet 8.
In conclusion fluid channel switching valve of the invention one of may be implemented to select to perform the following operation respectively: from
The first fluid that one entrance 5 enters the switching valve is discharged to the external world；Enter the first fluid of the switching valve from first entrance 5
It is discharged from first outlet 6；The second fluid for entering the switching valve from second entrance 7 is discharged from second outlet 8.
Referring to Fig. 6, as the one embodiment for the valve plug 4 that fluid channel switching valve of the present invention uses, the valve plug 4 has
The upper section 21 of the access can be cooperatively formed with valve rod 2, and can be with the lower section 22 of 20 close fit of sealing.The upper section 21
With scraggly upper surface, the lower section 22 has can be with the closed smooth contact surface abutted of sealing 22.Preferably,
As shown in Fig. 2, the contact surface has from top to bottom gradually expanding truncated cone-shaped structure, the sealing has to be adapted with it
Truncated cone-shaped structure.
As shown in figure 8, the fluid channel switching valve of second embodiment of the invention, with above-mentioned first embodiment difference
Be, the cooperation between the sealing 20 and the lower section 22 of valve plug 4 is arranged to: when sealing 20 with valve rod 2 in button 3
After moving down certain distance under effect, the access is just opened.Specific structure is that the sealing 20 has one section and the valve
Plug 4 inner wall close fit extended segment 23, when operator touch the button downwards 3 when, the sealing 20 is not immediately to valve plug 4
Depressurization, but when extended segment 23 is moved fully to leave valve plug 4, the sealing is just released from.Above structure is conducive to
Prevent operator when the first fluid for entering the switching valve from first entrance 5 is discharged from first outlet 6 in preparation, maloperation
Or force is excessive that button 3 is caused to move down sub-fraction, and using above-mentioned structure, even if the maloperation occurs, the
Channel between two entrances 7 and second outlet 8 is not opened immediately, and second fluid is prevented to be discharged from second outlet 8, so that
Fluid channel switching valve of the invention has better operability.
In some embodiments, it is abutted between the lower periphery of the button and the upper peripheral edge of the valve bonnet by a spring,
So that the button can set back automatically after being pressed and unclamping.
In some embodiments, the outer wall of the valve rod, is also surrounded at least one guide collar, and the guide collar is ring-type
There are gaps between non-resilient object, and the inner wall of the valve bonnet, for keeping the valve rod to slide up and down along the valve bonnet inner wall
When smoothness.
The present invention also provides a kind of endoscopes, have any one fluid channel switching valve of the invention.Stream of the invention
When body channel switching valve is applied in the endoscope, the plenum system of the first entrance connection endoscopic system, that is, even
The air pump for connecing the first entrance is continuously supplied into the first entrance；The second entrance connects endoscopic system
Send water system；Water is supplied gas and sent respectively to the first outlet and the second outlet into human body, in general endoscopic system,
The first outlet and the second outlet are merged into one outlet except the fluid channel switching valve, pass through a channel
It is connected to the head end of endoscope mirror body.Endoscope of the invention can make operator easily select to send water or supply gas to patient's body
It is interior.
Be provided for the embodiments of the invention above a kind of fluid channel valve, fluid channel switching valve and endoscope into
It has gone and has been discussed in detail, but the above embodiments are only used to help understand structure and its core concept of the invention, do not answered
It is interpreted as limitation of the present invention.Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in
Change or replacement, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of fluid channel valve, which is characterized in that including valve bonnet, valve rod, valve plug；
The valve bonnet accommodates the valve rod, and different height is provided with fluid inlet and fluid outlet, the valve plug on the valve bonnet
Be fixedly arranged in the valve bonnet, the height of the valve plug between the fluid inlet and the fluid outlet, the valve bonnet
Other positions are sealing state；
The valve plug is looped around around the valve rod, and being equipped between the valve rod can be such that the valve plug communicates up and down
Access, the end of the valve rod has a sealing, and the valve rod is not sealed by can constitute to the access when external force,
When the valve rod moves down under external force, the access is opened；The valve plug have can with the sealing is closed matches
The lower section of conjunction, and the upper section of the access can be cooperatively formed with the valve rod；The upper section of the valve plug has scraggly
Upper surface has a stopper section on the valve rod, after the valve rod moves down under external force, the stopper section and it is described on
Surface abuts, and the scraggly upper surface constitutes a part of the access.
2. fluid channel valve according to claim 1, which is characterized in that the lower section of the sealing and the valve plug it
Between cooperation be arranged to: after the sealing moves down certain distance with the valve rod, the access is just opened.
3. a kind of fluid channel switching valve characterized by comprising
Valve bonnet, valve rod, button, valve plug；
The valve bonnet accommodates the valve rod, the valve bonnet inner wall ring week is provided with step, is provided with from top to bottom on the valve bonnet
First outlet, first entrance, second outlet, second entrance, and the first outlet is located at the top of the step, described first
Entrance, second outlet, second entrance are located at the lower section of the step；
Have a through-hole in the valve rod, the through-hole includes the longitudinal sections that upper end is connected with the button, and with the longitudinal direction
The traversing section of Duan Liantong, the traversing section extend transversely through the valve rod, so that the through-hole is connected to the inner cavity of the valve bonnet；
The button is located at the top of the valve rod, is connected with the longitudinal sections of the through-hole, and the button is equipped with will be described
The aperture that through-hole is connected with ambient atmosphere；
The outer wall of the valve rod is surrounded with the first sealing ring, gasket, the second sealing ring from top to bottom, first sealing ring,
Second sealing ring is annular resilient object, the height of first sealing ring be located at the button hereinafter, the first outlet with
On, and hermetic abut the inner wall of the valve bonnet；The height of the gasket is located at the first outlet hereinafter, the step
More than；There is the gasket cricoid sealing ring and bottom and sealing ring integrated molding, periphery to extend obliquely upward
Leather cup；There are gaps between the sealing ring and the inner wall of the valve bonnet, and can be under button effect under the valve rod
It moves to and is sealed against with the step, the leather cup hermetic abuts the inner wall of the valve bonnet, and the edge of the leather cup is easy
It deforms under external force；The height of second sealing ring is located at the first entrance hereinafter, more than the second outlet, and
Hermetic abut the inner wall of the valve bonnet；
The height of the traversing section of through-hole in the valve rod is located at the gasket hereinafter, more than second sealing ring, so that
The through-hole is connected to the first entrance；
The valve plug is embedded in the valve bonnet, the height of the valve plug in the second outlet hereinafter, the second entrance with
On, the valve plug is looped around around the valve rod, and being equipped between the valve rod can be such that the valve plug communicates up and down
Access, the end of the valve rod has a sealing, and the valve rod is not by can access structure to the valve plug when external force
At sealing, when the valve rod moves down under the action of the button, the access is opened；
The valve plug has and and can cooperatively form the access with the valve rod with the lower section of the sealing close fit
Upper section；The upper section of the valve plug has scraggly upper surface, has a stopper section on the valve rod, when the valve rod exists
After moving down under external force, the stopper section is abutted with the upper surface, and the scraggly upper surface constitutes the access
A part.
4. fluid channel switching valve according to claim 3, which is characterized in that the lower periphery of the button and the valve bonnet
Upper peripheral edge between by a spring abut.
5. fluid channel switching valve according to claim 3, which is characterized in that the lower section of the sealing and the valve plug
Between cooperation be arranged to: after the sealing moves down certain distance under the action of the button with the valve rod, institute
Access is stated just to be opened.
6. fluid channel switching valve according to claim 3, which is characterized in that the lower section inner wall of the valve plug has from upper
Gradually expanding truncated cone-shaped structure is arrived down, the sealing has the truncated cone-shaped structure adaptable with it.
7. a kind of endoscope has a kind of such as fluid channel valve of any of claims 1-2.
8. a kind of endoscope has a kind of fluid channel switching valve as described in any one of claim 3-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510757382.7A CN106667421B (en) | 2015-11-10 | 2015-11-10 | A kind of fluid channel valve, fluid channel switching valve and endoscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510757382.7A CN106667421B (en) | 2015-11-10 | 2015-11-10 | A kind of fluid channel valve, fluid channel switching valve and endoscope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106667421A CN106667421A (en) | 2017-05-17 |
| CN106667421B true CN106667421B (en) | 2019-11-01 |
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| CN201510757382.7A Active CN106667421B (en) | 2015-11-10 | 2015-11-10 | A kind of fluid channel valve, fluid channel switching valve and endoscope |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018128762A1 (en) * | 2018-11-15 | 2020-05-20 | Olympus Winter & Ibe Gmbh | Medical instrument for endoscopic applications and device for regulating a rinsing liquid flow for a medical instrument |
| EP3979891A1 (en) | 2019-06-10 | 2022-04-13 | Boston Scientific Scimed, Inc. | Medical cleaning valve |
| CN110522396B (en) * | 2019-09-04 | 2021-11-16 | 重庆金山医疗技术研究院有限公司 | Medical endoscope and aqueous vapor diverter valve thereof |
| CN114233892B (en) * | 2022-02-24 | 2022-05-24 | 杭州莱恩瑟特医疗技术有限公司 | Gas-liquid switching valve and endoscope |
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| CN101371066A (en) * | 2006-01-17 | 2009-02-18 | 施雷德有限公司 | Gas injection valve with two positions of closure |
| CN104853667A (en) * | 2013-04-18 | 2015-08-19 | 奥林巴斯株式会社 | Endoscopic tube switching device, endoscope, and production method for endoscopic tube switching device |
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| CN1184221A (en) * | 1996-11-29 | 1998-06-10 | 张腾广 | Water-saving tap capable of being turned on or off through rotation, depressing and treading |
| JP2005245668A (en) * | 2004-03-03 | 2005-09-15 | Pentax Corp | Connector for cleaning water pipe of endoscope |
| JP5404569B2 (en) * | 2010-09-22 | 2014-02-05 | 富士フイルム株式会社 | Endoscope suction button |
| JP2013070702A (en) * | 2011-09-26 | 2013-04-22 | Fujifilm Corp | Fluid conduit switching device and endoscope |
| CN204293107U (en) * | 2014-11-20 | 2015-04-29 | 珠海迈德豪医用科技有限公司 | A kind of suction device of endoscope |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101371066A (en) * | 2006-01-17 | 2009-02-18 | 施雷德有限公司 | Gas injection valve with two positions of closure |
| CN104853667A (en) * | 2013-04-18 | 2015-08-19 | 奥林巴斯株式会社 | Endoscopic tube switching device, endoscope, and production method for endoscopic tube switching device |
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| CN106667421A (en) | 2017-05-17 |
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