CN106923778A - A kind of disposable hard endoscope casing tube camera lens and alignment lenses method - Google Patents
A kind of disposable hard endoscope casing tube camera lens and alignment lenses method Download PDFInfo
- Publication number
- CN106923778A CN106923778A CN201710278018.1A CN201710278018A CN106923778A CN 106923778 A CN106923778 A CN 106923778A CN 201710278018 A CN201710278018 A CN 201710278018A CN 106923778 A CN106923778 A CN 106923778A
- Authority
- CN
- China
- Prior art keywords
- photodetector
- stiffening ring
- camera lens
- rigid
- stopping means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00142—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with means for preventing contamination, e.g. by using a sanitary sheath
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
Abstract
The invention discloses a kind of disposable endoscope sleeve pipe camera lens and its alignment methods.The camera lens includes rigid head portion and flexible sleeve；The connection end of flexible sleeve is connected with rigid head portion, and its other end is the free-end of opening；1 is provided with inside head:The lens set of 1 printing opacity, forms closed front；Flexible sleeve connection end has the first stiffening ring, and its free-end has the second stiffening ring, first and second stopping means is provided with first and second stiffening ring；Flexible sleeve is used to be socketed in rigid endoscope outer surface；First and second stiffening ring, by first and second stopping means so that the position of lens set and rigid endoscope lens set key light overlapping of axles.Methods described, including cause that first stiffening ring keeps coaxial with the lens set by rigid head portion；First stiffening ring keeps coaxial with the second stiffening ring by first and second stopping means.Sleeve pipe camera lens and its alignment methods that the present invention is provided, it is possible to resolve existing endoscopy disinfection and imaging problem.
Description
Technical field
The invention belongs to medical instruments field, more particularly, to a kind of disposable hard endoscope casing tube camera lens and mirror
Head alignment methods.
Background technology
Rigid endoscope is widely used to clinical examination, and endoscope can enter in patient body during inspection.It is existing medical
Endoscope is reusable due to expensive, and to avoid the cross-infection between patient, every endoscope is being used
Have to pass through afterwards strictly and the disinfectant program of complexity, bring use cost and depreciable cost higher.
Therefore endoscope disposable sleeve is developed, and cross-infection is solved the problems, such as from source, and reduction is used
Cost.But the sleeve pipe for using at present, due to equipment matter printing opacity sex chromosome mosaicism, it is difficult to realize blur-free imaging.Although having technology (see public affairs
The number of opening is the Chinese patent of CN 1644176A) using the disposable sleeve of optical lens making front end closing, but lenses
And printing opacity problem registering with endoscope lens set, causes imaging distortion inaccurate, influences medical judgment, and clinic is few to be used.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of disposable hard endoscope casing tube
Camera lens extremely method for registering, its object is to by the rigid head portion of the camera lens set optical mirror slip group, and by limit
Position device carries out optical register with rigid endoscope, thus solves existing rigid endoscope sterilization sleeve pipe influence printing opacity or difficulty
With registration cause imaging effect it is not good, influence medical judgment technical problem.
To achieve the above object, according to one aspect of the present invention, there is provided a kind of disposable hard endoscope casing tube mirror
Head, including rigid head portion and flexible sleeve；The connection end of the flexible sleeve is connected with the rigid head portion, and its other end is to open
The free-end of mouth；
1 is provided with inside the head:The lens set of 1 printing opacity, forms closed front；
The flexible sleeve connection end has the first stiffening ring, and its free-end has the second stiffening ring, described first and the
First and second stopping means is provided with two stiffening rings；The flexible sleeve is used to be socketed in rigid endoscope outer surface；Institute
First and second stiffening ring is stated, by first and second stopping means so that the head is fixed, set in it 1:1 printing opacity
The position of lens set and rigid endoscope lens set key light overlapping of axles.
Preferably, the disposable hard endoscope casing tube camera lens, the lens set of its head, its each eyeglass all has post
Shape part, the stylolitic part coordinates with rigid head portion inner surface.
Preferably, the disposable hard endoscope casing tube camera lens, its lens set includes 21:The convex lens of 1 printing opacity, institute
Convex lens lens transmission is stated more than or equal to 99%.
Preferably, the disposable hard endoscope casing tube camera lens, the stiffening ring of its lens set, first and second is coaxial
Set.
Preferably, the disposable hard endoscope casing tube camera lens, its first stopping means includes being arranged at the first rigidity
First and second photodetector at ring diameter two ends；Second stopping means includes being arranged at the second stiffening ring to diameter two
3rd and the 4th photodetector at end；Any one detectable and other three pieces of photoelectricity in first to fourth photodetector
The distance of detector.
Preferably, the disposable hard endoscope casing tube camera lens, its first to fourth photodetector is in same flat
In face, the primary optical axis that the plane passes through the lens set.
Preferably, the disposable hard endoscope casing tube camera lens, its photodetector is Nanoparticles Based Photodetectors.
According to another aspect of the present invention, there is provided a kind of alignment of the rigid endoscope sleeve pipe camera lens that present invention is provided
Method, comprises the following steps：
First stiffening ring keeps coaxial with the lens set by rigid head portion；
First stiffening ring keeps coaxial with the second stiffening ring by first and second stopping means.
Preferably, the alignment methods of the rigid endoscope sleeve pipe camera lens, its described first stiffening ring and the second stiffening ring
Keep coaxial by first and second stopping means, specially：
First stopping means includes being arranged at first and second photodetector at the first rigid ring diameter two ends；Institute
Stating the second stopping means includes being arranged at the 3rd and the 4th photodetector of the second stiffening ring to diameter two ends；Described first to
Any one detectable and other three pieces of distances of photodetector in 4th photodetector；
So that in first to fourth photodetector the distance between any two groups of photodetectors have with it is right
The distance between two groups of photodetectors of title property are identical.
Preferably, the alignment methods of the rigid endoscope sleeve pipe camera lens, at its described first to fourth photodetector
In in same plane, wherein first and the 3rd photodetector be located at homonymy, second with the 4th photodetector positioned at homonymy；
It is described so that in first to fourth photodetector the distance between any two groups of photodetectors have with it is right
The distance of two groups of photodetectors of title property is identical, specifically includes：
So that described first and the 3rd the distance between photodetector with second and the 4th between photodetector away from
From identical；And
So that described first and the 4th the distance between photodetector with second and the 3rd between photodetector away from
From identical.
In general, by the contemplated above technical scheme of the present invention compared with prior art, can obtain down and show
Beneficial effect：
, there is the technology that imaging effect is influenceed after can not being fully sealed or sealing in current rigid endoscope sleeve pipe camera lens
Problem, the rigid endoscope sleeve pipe camera lens that the present invention is provided, is closed by lens set to head so that enter subject's body
Internal endoscope is completely in isolation, prevents cross-infection.Pass through lens set and rigid head portion simultaneously, set and flexible pipe
The stiffening ring at two ends coordinates to solve the camera lens registration problems of lens set and endoscope, fundamentally improves image quality, from
And improve the accuracy of imaging.In sum, the disposable hard endoscope casing tube camera lens that the present invention is provided, relative to existing
Endoscope casing tube, sealing is tight, and isolation is thorough, and imaging effect has essential raising.
The method that the present invention is provided, may be such that sleeve pipe camera lens and endoscope head reliable registration, so as to ensure image quality.
Brief description of the drawings
Fig. 1 is the rigid endoscope sleeve pipe lens construction schematic diagram that the present invention is provided；
Fig. 2 is the rigid endoscope sleeve pipe alignment lenses method schematic diagram that the present invention is provided.
In all of the figs, identical reference be used for represent identical element or structure, wherein：1 is head, and 11 are
Convex lens, 2 is flexible sleeve, and 21 is the first stiffening ring, and 211 is the first photodetector, and 212 is the second photodetector, 22
It is the second stiffening ring, 221 is the 3rd photodetector, and 222 is the 4th photodetector.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each implementation method
Not constituting conflict each other can just be mutually combined.
The disposable hard endoscope casing tube camera lens that the present invention is provided, as shown in figure 1, including rigid head portion 1 and flexible boot
Pipe 2；The connection end of the flexible sleeve 2 is connected with the rigid head portion 1, and its other end is the free-end of opening.
The front end of the head 1 is closed, and preferably using metal material, such as stainless steel is provided with 1 in it:The eyeglass of 1 printing opacity
Group, forms closed front.The lens set of the head 1, preferably its each eyeglass all have stylolitic part, the stylolitic part with
The inner surface of rigid head portion 1 coordinates.Stylolitic part can stabilized lenses group primary optical axis, it is convenient with punctual centering operation, especially in mirror
When piece exceedes a piece of, fixed with rigid head portion 1 by its stylolitic part between multiple eyeglasses, stabilization primary optical axis.
It is preferred that, lens set is constituted using two groups of convex lens 11, the eyeglass focal length is identical, and formation does not influence the height of imaging thoroughly
Photosystem.The light transmittance of the convex lens 11 is more than or equal to 99%.
The connection end of the flexible sleeve 2 has the first stiffening ring 21, and its free-end has the second stiffening ring 22, described first
First and second stopping means is provided with the second stiffening ring 22；The flexible sleeve 2 is used to be socketed in outside rigid endoscope
Surface, it is preferable that the stiffening ring of the lens set, first and second 21,22 is coaxially disposed.The flexible sleeve 2 preferably uses doctor
Level plastics are treated, first, second stiffening ring 21,22 preferably uses stainless steel, preferably 304S stainless steels.
First stopping means includes being arranged at first and second photodetector at the diameter two ends of the first stiffening ring 21
211、212；Second stopping means includes being arranged at the 3rd and the 4th photodetection of the second stiffening ring 22 to diameter two ends
Device 221,222；Any one detectable and other three pieces of distances of photodetector in first to fourth photodetector.It is excellent
Selection of land, first to fourth photodetector is in same plane, the primary optical axis that the plane passes through the lens set.
The photodetector is Nanoparticles Based Photodetectors, it is preferred to use ceramic nano material photodetector.
During work, described first and second stiffening ring 22, by first and second stopping means so that the head 1 is consolidated
Determine 1 for setting in the inner:The lens set of 1 printing opacity and the position of rigid endoscope lens set key light overlapping of axles.
Specifically, being aligned according to the alignment methods that the present invention is provided, following steps are specifically included：
First stiffening ring 21 keeps coaxial with the lens set by rigid head portion 1, i.e. the center of the first stiffening ring 21
Axle is identical with the central shaft of rigid head portion 1, similarly hereinafter；
First stiffening ring 21 keeps coaxial with the second stiffening ring 22 by first and second stopping means.
Preferred scheme：First stopping means includes being arranged at first and second light at the diameter two ends of the first stiffening ring 21
Electric explorer 211,212；Second stopping means includes being arranged at the second stiffening ring 22 to the 3rd and the 4th of diameter two ends
Photodetector 212,222；Any one detectable and other three pieces of photodetectors in first to fourth photodetector
Distance；Now first stiffening ring 21 keeps coaxial with the second stiffening ring 22 by first and second stopping means, specifically
For：So that the distance between any two groups of photodetectors have symmetry with it in first to fourth photodetector
The distance between two groups of photodetectors are identical.
For example：Because first, second photodetector 211,212 is relative to primary optical axis axial symmetry, relative to the first rigidity
The center of circle Central Symmetry of ring 21；Because the three, the 4th photodetectors 221,222 are relative to primary optical axis axial symmetry, relative to and
Rigid ring center Central Symmetry；Therefore the 3rd photodetector 221 can be considered the first photodetector 211 in the second stiffening ring 22
The projection for being converted according to certain on product face and being come, the 4th photodetector 222 is considered as the second photodetector 212 in the second rigidity
The projection come according to same conversion also in plane；Therefore the 3rd, the 4th photodetector 221,222 is respectively with the one the second
Photodetector 211,212 has symmetry.
It is highly preferred that first to fourth photodetector 222 is in same plane, wherein first and the 3rd photoelectricity
Detector 221 is located at homonymy, second with the 4th photodetector 212,222 positioned at homonymy；
It is described so that in first to fourth photodetector the distance between any two groups of photodetectors have with it is right
The distance of two groups of photodetectors of title property is identical, specifically includes：
So that described first and the 3rd photodetector 211, the distance between 221 and second and the 4th photodetector
212nd, the distance between 222 is identical；And
So that described first and the 4th photodetector 211, the distance between 222 and second and the 3rd photodetector
212nd, the distance between 221 is identical.
Further, it is described so that first to when 21 and second 22 equal diameters of stiffening ring of the first stiffening ring
In four photodetectors the distance between any two groups of photodetectors with its have symmetry two groups of photodetectors away from
From identical, also include：
So that first and second photodetector 211, the distance between 212 and second and the 4th photodetector
212nd, the distance between 222 is identical.
It is below embodiment：
Embodiment 1
Disposable hard endoscope casing tube camera lens, is cylindric with what rigid endoscope coordinated, as shown in figure 1, including not
Rust steel head 1 and PE film casings 2：
The PE film casings, one end is connected for connection end with the stainless steel head 1, and the other end is the free-end of opening,
For being socketed rigid endoscope；Its two ends has diameter identical 304S stainless steel rings, i.e. first, second stiffening ring 21,22；Its
Described on two copper rings, in the plane by primary optical axis, be provided with two groups of nano photodetectors, i.e., first to fourth nanometer
Photodetector；The nano photodetectors, using ceramic nano material photodetector.First stiffening ring 21 and stainless steel
Head 1 is coaxially connected.
The front end of the head 1, it is built-in by two piece 1:The lens set of the composition of convex lens 11 of 1 printing opacity；In the convex lens 11
Portion has the thick stylolitic parts of 1mm, tightly coordinates with the inwall of head 1, so that closed front, it is ensured that rigid endoscope and subject
Physical environment isolation, and cause the stabilization of convex lens 11, two convex lens 11 have the primary optical axis that stabilization overlaps, conveniently match somebody with somebody
It is accurate.The focal length of the convex lens 11 is identical, and light transmittance is more than or equal to 99%.
The stainless steel head 1, first and second property core ring are coaxial, it is ensured that the lens set and first, second stiffening ring
22 is coaxial.
Embodiment 2
Disposable hard endoscope casing tube camera lens as described in Example 1, during socket rigid endoscope, as follows
Alignment：
First stiffening ring 21 remains coaxial with stainless steel head 1；
First stiffening ring 21 keeps coaxial with the second stiffening ring 22 in accordance with the following steps：
I.e. between the distance between first and second nano photodetectors and the 3rd and the 4th nano photodetectors
Apart from identical；
First and the 3rd the distance between nano photodetectors and second and the 4th between nano photodetectors away from
From identical；
First and the 4th the distance between nano photodetectors and second and the 4th between nano photodetectors away from
From identical；
When three groups of distances of the above are simultaneously identical, judge that the first stiffening ring 21 keeps coaxial with the second stiffening ring 22.
Coaxial condition more than meeting, that is, cause that the lens group of rigid head portion 1 is directed at completion with rigid endoscope.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, it is not used to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should include
Within protection scope of the present invention.
Claims (10)
1. a kind of disposable hard endoscope casing tube camera lens, it is characterised in that including rigid head portion (1) and flexible sleeve (2)；Institute
The connection end for stating flexible sleeve (2) is connected with the rigid head portion (1), and its other end is the free-end of opening；
1 is provided with inside the head (1):The lens set of 1 printing opacity, forms closed front；
Flexible sleeve (2) connection end has the first stiffening ring (21), and its free-end has the second stiffening ring (22), described the
One and second is provided with first and second stopping means on stiffening ring (21,22)；The flexible sleeve (2) is for being socketed in hard
Endoscope exterior surface；Described first and second stiffening ring (21,22), by first and second stopping means so that the eyeglass
Organize the position with rigid endoscope lens set key light overlapping of axles.
2. hard endoscope casing tube camera lens as claimed in claim 1 disposable, it is characterised in that the eyeglass of the head (1)
Group, its each eyeglass all has stylolitic part, and the stylolitic part coordinates with rigid head portion (1) inner surface.
3. rigid endoscope sleeve pipe camera lens as claimed in claim 2, it is characterised in that the lens set includes 21:1 printing opacity
Convex lens (11), convex lens (11) the light passband be more than or equal to 99%.
4. rigid endoscope sleeve pipe camera lens as claimed in claim 1, it is characterised in that the lens set, first and second
Stiffening ring (21,22) is coaxially disposed.
5. rigid endoscope sleeve pipe camera lens as claimed in claim 4, it is characterised in that first stopping means includes setting
In first and second photodetector (211,212) at the first stiffening ring (21) diameter two ends；Second stopping means includes
It is arranged at the 3rd and the 4th photodetector (221,222) of the second stiffening ring (22) to diameter two ends；Described first to fourth
Any one detectable and other three pieces of distances of photodetector in photodetector.
6. rigid endoscope sleeve pipe camera lens as claimed in claim 5, it is characterised in that first to fourth photodetector
In same plane, the primary optical axis that the plane passes through the lens set.
7. rigid endoscope sleeve pipe camera lens as claimed in claim 5, it is characterised in that the photodetector is nano material
Photodetector.
8. alignment methods of the rigid endoscope sleeve pipe camera lens as described in claim 1 to 7 any one, it is characterised in that bag
Include following steps：
First stiffening ring (21) keeps coaxial with the lens set by rigid head portion (1)；
First stiffening ring (21) keeps coaxial with the second stiffening ring (22) by first and second stopping means.
9. alignment methods of rigid endoscope sleeve pipe camera lens as claimed in claim 8, it is characterised in that first stiffening ring
(21) keep coaxial by first and second stopping means with the second stiffening ring (22), specially：
First stopping means includes being arranged at first and second photodetector at the first stiffening ring (21) diameter two ends
(211、212)；Second stopping means includes being arranged at the 3rd and the 4th photoelectricity of the second stiffening ring (22) to diameter two ends
Detector (221,222)；Any one detectable and other three pieces of photodetectors in first to fourth photodetector
Distance；
So that the distance between any two groups of photodetectors have symmetry with it in first to fourth photodetector
The distance between two groups of photodetectors it is identical.
10. rigid endoscope sleeve pipe alignment lenses method as claimed in claim 9, it is characterised in that described first to fourth
Photodetector be in same plane in, wherein first and the 3rd photodetector (211,221) positioned at homonymy, second and the 4th
Photodetector (212,222) is positioned at homonymy；
It is described so that the distance between any two groups of photodetectors have symmetry with it in first to fourth photodetector
Two groups of photodetectors distance it is identical, specifically include：
So that described first and the 3rd the distance between photodetector (211,221) and second and the 4th photodetector
The distance between (212,222) are identical；And
So that described first and the 4th the distance between photodetector (211,222) and second and the 3rd photodetector
The distance between (212,221) are identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710278018.1A CN106923778B (en) | 2017-04-25 | 2017-04-25 | A kind of disposable hard endoscope casing tube camera lens and alignment lens method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710278018.1A CN106923778B (en) | 2017-04-25 | 2017-04-25 | A kind of disposable hard endoscope casing tube camera lens and alignment lens method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106923778A true CN106923778A (en) | 2017-07-07 |
| CN106923778B CN106923778B (en) | 2018-09-18 |
Family
ID=59438120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710278018.1A Expired - Fee Related CN106923778B (en) | 2017-04-25 | 2017-04-25 | A kind of disposable hard endoscope casing tube camera lens and alignment lens method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106923778B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4905082A (en) * | 1987-05-06 | 1990-02-27 | Olympus Optical Co., Ltd. | Rigid video endoscope having a detachable imaging unit |
| US5337734A (en) * | 1992-10-29 | 1994-08-16 | Advanced Polymers, Incorporated | Disposable sheath with optically transparent window formed continuously integral therewith |
| US5413092A (en) * | 1991-06-24 | 1995-05-09 | Xomed-Treace, Inc. | Sheath for endoscope |
| CN1644176A (en) * | 2005-01-25 | 2005-07-27 | 石靖 | Endoscope (hard mirror) medical sterilizing covers |
| CN102348404A (en) * | 2009-02-24 | 2012-02-08 | 威神斯扣普技术有限公司 | Disposable sheath for use with an imaging system |
| US20130211200A1 (en) * | 2009-12-04 | 2013-08-15 | James K. Brannon | Cannula Positioned Targeting Guide |
| CN105246392A (en) * | 2013-12-24 | 2016-01-13 | 奥林巴斯株式会社 | Endoscope sheath |
| CN105231979A (en) * | 2015-10-19 | 2016-01-13 | 珠海康弘发展有限公司 | Medical endoscope, inner and outer sheath kits and medical endoscope system |
| CN205107611U (en) * | 2015-10-27 | 2016-03-30 | 杭州微视医疗科技有限公司 | Disposable gastroscope insert tube |
| CN205107588U (en) * | 2015-10-27 | 2016-03-30 | 杭州微视医疗科技有限公司 | Disposable endoscope protecting sleeve |
-
2017
- 2017-04-25 CN CN201710278018.1A patent/CN106923778B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4905082A (en) * | 1987-05-06 | 1990-02-27 | Olympus Optical Co., Ltd. | Rigid video endoscope having a detachable imaging unit |
| US5413092A (en) * | 1991-06-24 | 1995-05-09 | Xomed-Treace, Inc. | Sheath for endoscope |
| US5337734A (en) * | 1992-10-29 | 1994-08-16 | Advanced Polymers, Incorporated | Disposable sheath with optically transparent window formed continuously integral therewith |
| CN1644176A (en) * | 2005-01-25 | 2005-07-27 | 石靖 | Endoscope (hard mirror) medical sterilizing covers |
| CN102348404A (en) * | 2009-02-24 | 2012-02-08 | 威神斯扣普技术有限公司 | Disposable sheath for use with an imaging system |
| US20130211200A1 (en) * | 2009-12-04 | 2013-08-15 | James K. Brannon | Cannula Positioned Targeting Guide |
| CN105246392A (en) * | 2013-12-24 | 2016-01-13 | 奥林巴斯株式会社 | Endoscope sheath |
| CN105231979A (en) * | 2015-10-19 | 2016-01-13 | 珠海康弘发展有限公司 | Medical endoscope, inner and outer sheath kits and medical endoscope system |
| CN205107611U (en) * | 2015-10-27 | 2016-03-30 | 杭州微视医疗科技有限公司 | Disposable gastroscope insert tube |
| CN205107588U (en) * | 2015-10-27 | 2016-03-30 | 杭州微视医疗科技有限公司 | Disposable endoscope protecting sleeve |
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| Publication number | Publication date |
|---|---|
| CN106923778B (en) | 2018-09-18 |
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Granted publication date: 20180918 Termination date: 20200425 |