CN107684488A - Selecting type muffler and the noise reduction earplug for including it - Google Patents
Selecting type muffler and the noise reduction earplug for including it Download PDFInfo
- Publication number
- CN107684488A CN107684488A CN201710919250.9A CN201710919250A CN107684488A CN 107684488 A CN107684488 A CN 107684488A CN 201710919250 A CN201710919250 A CN 201710919250A CN 107684488 A CN107684488 A CN 107684488A
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- China
- Prior art keywords
- chamber
- stopper
- conduction
- diameter
- conduction chamber
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/08—Protective devices for the ears internal, e.g. earplugs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/08—Protective devices for the ears internal, e.g. earplugs
- A61F11/085—Protective devices for the ears internal, e.g. earplugs including an inner channel
Abstract
The invention discloses a kind of selecting type muffler and the noise reduction earplug for including it, the remote ear end of cock body is provided with knob installation room, conduction chamber is offered in cock body, conduction chamber is placed in the rear side of knob installation room, it is cylinder or reverse taper to conduct chamber, the remote ear side wall of conduction chamber is provided with sound inlet, sound inlet connects with conduction chamber, conduction intracavitary plug is provided with stopper, stopper fits with conduction chamber, stopper is cylinder or cone, the nearly ear end of cock body is provided with tuning chamber, gag is covered on the end at the nearly ear end of cock body, tuning pad is fixed between gag and tuning chamber, enter sound switching knob and conduction intracavitary is rotatably connected in by knob installation room, the outer surface of stopper offers a groove run through vertically, the inner surface of groove and conduction chamber on the outer surface of stopper forms noise rejection chamber, sender is offered on gag.The present invention is while hazardous noise is completely cut off, in the range of partial sound intensity in need is maintained at and can rationally obtained by human ear by and can.
Description
Technical field
The present invention relates to the technical field of the muffler for filtering noise, more particularly to a kind of selecting type muffler
And include the noise reduction earplug of the selecting type muffler.
Background technology
The various requirements for hearing protection are more and more common in live and work at present, conventional various sponges, plastic cement ear
Plug can reduce the decibel value of various sound.Research and development have by said minuscule hole to reduce the penetrability of sound wave in the market at present, from
And reaching reduces medium-high frequency intensity of sound, but because of the diffraction characteristic of sound wave, for component frequency particularly Middle and low frequency noise
Reduction cannot be controlled effectively.
The content of the invention
The present invention is directed to problem and shortage existing for prior art, there is provided a kind of selecting type muffler and includes its drop
Make an uproar earplug, while hazardous noise is completely cut off, partial sound intensity in need is maintained at and can rationally obtained by human ear by and can
In the range of.
The present invention is that solve above-mentioned technical problem by following technical proposals：
The present invention provides a kind of selecting type muffler, and its feature is, it include a cock body, a stopper, a tuning pad,
One gag and one enters sound switching knob, and the remote ear end of the cock body is provided with knob installation room, conduction chamber is offered in the cock body,
The conduction chamber is placed in the rear side of knob installation room, the conduction chamber be a cylinder or reverse taper, the chamber that conducts
Sound inlet is offered on the wall of remote ear side, the sound inlet connects with the conduction chamber, and the conduction intracavitary plug is provided with the plug
Rod, the stopper fit with the conduction chamber, and the stopper is a cylinder or cone, and the nearly ear end of the cock body is provided with
Tuning chamber, the gag are covered on the end at the nearly ear end of the cock body, are fixed between the gag and the tuning chamber
State tuning pad, it is described enter sound switching knob room installed by the knob be rotatably connected in the conduction intracavitary, the appearance of the stopper
Face offers a groove run through vertically, and the inner surface of the groove on the outer surface of the stopper and the conduction chamber forms noise suppression
Only chamber, sender is offered on the gag.
It is preferred that it is described enter sound switching knob include a joystick knob, one installation sticking part and one enter sound rotary plunger, institute
The side for stating installation sticking part is fixed with the joystick knob, opposite side be fixed with it is described enter sound rotary plunger, it is described enter sound rotation
Rotary column plug is non-completely circular structure；
The joystick knob is placed on the outside of the end at the remote ear end of the cock body, the part installation of the installation sticking part
Knob installation is indoor, another part extends to the conduction intracavitary, another part of the installation sticking part with it is described
Conduction chamber wall be bonded completely, it is described enter sound rotary plunger side with it is described conduct chamber inwall be completely bonded, opposite side
The sound into the sound inlet is set to enter conduction intracavitary provided with gap.
It is preferred that the conduction chamber is reverse taper, the stopper is cone, and the cone gradient of the stopper is equal to described
Conduct the chamber cones gradient of chamber；Or the conduction chamber is cylinder, the stopper is cone；Or the conduction chamber
For cone, the stopper is cylinder；Or the conduction chamber and the stopper are cylinder.
It is preferred that the diameter of the middle part of the conduction chamber is less than or equal to the diameter at both ends, it is described to conduct in chamber
Between position a diameter of 0.5~4mm, a diameter of 0.5~4mm at the both ends of the conduction chamber, the length of the conduction chamber for 5~
25mm。
It is preferred that it is described conduction chamber middle part a diameter of 1.8mm, it is described conduction chamber both ends it is a diameter of
2mm, the length of the conduction chamber is 12mm.
It is preferred that the diameter of the conduction chamber is progressively reduced until along nearly ear end to remote ear extreme direction and reaches minimum diameter
Gradually increase again afterwards, the diameter of the conduction chamber are progressively reduced until that the length for reaching smallest diameter portion is more than or equal to the plug
The length of body.
It is preferred that the stopper is cone, the outside diameter of the stopper is 0.5~4mm, and the small end of the stopper is straight
Footpath is 0.5~4mm, and the length of the stopper is 1mm-25mm.
It is preferred that the outside diameter of the stopper is 2mm, the end diameter of the stopper is 1.7mm, the length of the stopper
Spend for 3.5mm.
It is preferred that the depth of the groove is 0.05~0.8mm.
It is preferred that a diameter of 3~10mm of the tuning chamber, the thickness of the tuning pad is 0.01~1mm, the tuning
The diameter of pad is less than or equal to the diameter of the tuning chamber.
It is preferred that the nearly ear end of the tuning chamber is fixed with vibrating diaphragm, remote ear end is fixed with the tuning pad, the vibrating diaphragm is
Vibrate thin slice.
The present invention also provides a kind of noise reduction earplug, and its feature is, it includes above-mentioned selecting type muffler and earplug
Body, the earplug body have one or more layers fin, and the nearly ear end of the selecting type muffler is inserted in the earplug body
Fill in hole, the internal diameter for filling in hole is less than the external diameter at the nearly ear end of the selecting type muffler.
It on the basis of common sense in the field is met, above-mentioned each optimum condition, can be combined, it is each preferably real to produce the present invention
Example.
The positive effect of the present invention is：
For the present invention while hazardous noise is completely cut off, partial sound intensity in need is maintained at by and can rationally can be by people
In the range of ear obtains.
Brief description of the drawings
Fig. 1 is the structure decomposition figure of the selecting type muffler of present pre-ferred embodiments.
Fig. 2 is the structural representation one of the selecting type muffler of present pre-ferred embodiments.
Fig. 3 is the structural representation two of the selecting type muffler of present pre-ferred embodiments.
Fig. 4 is the structural representation of the vibrating diaphragm of present pre-ferred embodiments.
Fig. 5 is the structural representation of the noise reduction earplug of present pre-ferred embodiments.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
As illustrated in fig. 1 and 2, the present embodiment provides a kind of selecting type muffler, by cock body 1, stopper 2, tuning pad 3, plug
Lid 4 and enter sound switching knob 5 and form.
The remote ear end of the cock body 1 is provided with knob installation room 101；Conduction chamber 102, the biography are offered in the cock body 1
Guide cavity 102 is placed in the rear side of the knob installation room 101, and the conduction chamber 102 is a cylinder or reverse taper；The conduction chamber
102 remote ear side wall is provided with sound inlet 104, and the sound inlet 104 connects with the conduction chamber 102；The conduction chamber 102
Interior plug is provided with the stopper 2, and the stopper 2 is a cylinder or cone；The nearly ear end of the cock body 1 is provided with tuning chamber 103；
The tuning chamber 103 is externally provided with gag 4；Tuning pad 3 is provided between the tuning chamber 103 and the gag 4；It is described enter sound switch
Knob installs room by the knob and is rotatably connected in the conduction intracavitary, and sender 401 is offered on the gag 4.
Wherein, it is described enter sound switching knob 5 include a joystick knob 501, one installation sticking part 502 and one enter sound column spinner
Plug 503, the side of the installation sticking part 502 is fixed with the joystick knob 501, opposite side be fixed with it is described enter sound column spinner
Plug 503.
The joystick knob 501 is arranged on the outside of the cock body 1；The rear side of joystick knob 501 is provided with installation fitting
Portion 502, a part for the installation sticking part 502 are arranged in knob installation room 101, and another part extends to the biography
In guide cavity 102；The installation sticking part 502 is bonded completely with chamber 102 wall of conducting, and prevents external sound through between the two
Gap is transmitted into the ear；The rear side of the installation sticking part 502 is additionally provided with into sound rotary plunger 503, it is described enter sound rotary plunger 503
For non-completely circular structure, it is described enter sound rotary plunger 503 side can be completely bonded with the inner surface of the conduction chamber 102, institute
The opposite side stated into sound rotary plunger 503 is provided with gap, and the gap enables the sound S2 into the sound inlet 104 to enter biography
In guide cavity 102.
As shown in figure 3, it is described enter sound rotary plunger 503 non-completely circular structure be semicylinder；When turn knob handle 501
Make to be bonded completely with the internal face of the conduction chamber 102 of the place angle of sound inlet 104 into the cylinder side of sound rotary plunger 503
When, then enter the sound S2 of the sound inlet 104 due to there is the cylinder stop into sound rotary plunger 503, cannot propagate into conduction
In chamber 102, also further it can not just be propagated into ear, such earplug will shield various frequency sound waves to greatest extent.
Above-mentioned conduction chamber 102, stopper 2 shape selection, be mainly based upon stopper 2 fill in conduction chamber 102 in after, can be tight
Closely connected conjunction；When meeting to be brought into close contact this condition, the conduction chamber 102 can be cylinder, and stopper 2 is cone；Or
The conduction chamber 102 can be cone, and stopper 2 is cylinder；Even, the conduction chamber 102 and stopper 2 are all cylinder
Body；Ensure after stopper 2 fills in conduction chamber 102, because of squeezing action, mutually can closely paste both walls in the axial direction
Close.
The both ends diameter of the conduction chamber 102 is slightly larger, a diameter of 0.5~4mm, preferably 2mm；In the conduction chamber 102
Between position diameter be less than or equal to both ends, preferably smaller than a diameter of 0.5~4mm, preferably 1.8mm；The length of the conduction chamber 102
For 5~25mm, preferably 12mm；The nearly ear end of conduction chamber 102 gradually decreases to remote ear end diameter, until minimum diameter is 1.7mm, should
Partial-length be more than or equal to cock body 2 length, preferably greater than cock body length 1mm, after reaching minimum diameter center, to remote ear end
Diameter gradually increases.
The stopper 2 is cone, and the outside diameter of the stopper 2 is 0.5~4mm, preferably 2mm；The stopper 2 it is small
Hold a diameter of 0.5~4mm, preferably 1.7mm；The length of the stopper 2 is 1~25mm, preferably 3.5mm；The appearance of the stopper 2
Face axially offers a half slot 201 run through along cone；The depth of the groove 201 is 0.05~0.8mm, preferably 0.1~
0.3mm。
The cone gradient of the stopper 2 is equal to the chamber cones gradient of the conduction chamber 102；The small end warp of the stopper 2
The big end plug of the conduction chamber 102 enters in the conduction chamber 102；The outer surface of stopper 2 and the interior table of the conduction chamber 102
Face, it is brought into close contact；The inner surface of groove 201 and the conduction chamber 102 on the outer surface of stopper 2 forms noise rejection chamber 6；Institute
State external sound wave S1 through the sound inlet 104 formed sound wave S2, by it is described enter sound rotary plunger 503 gap, subsequently into
The conduction chamber 102, forms sound wave S3；The sound wave S3 further propagates through the noise rejection chamber 6 into duct, due to making an uproar
Sound supression chamber 6 is more long and narrow, can be effectively to the noise in sound wave S3, and particularly middle low frequency noise is restrained, so as to shape
Into relatively soft sound wave S4.
Sound wave S4 enters the tuning chamber 103 immediately, and the nearly ear end or remote ear end of the tuning chamber 103 are provided with tuning pad 3,
It is preferred that nearly ear end；Popular PP, nylon, glass, carbon fiber nonwoven fabric or the netted material of in the market can be used in the tuning pad 3
Material, or even metal material, its external diameter are less than or equal to the internal diameter of the tuning chamber 103, and the tuning pad 3 filters the portion in sound wave S3
Divide senior middle school's low frequency noise, while by selecting in the market unlike material, density, it is different that thickness tuning is lined with pointedly filtering
Frequency；The outboard cover of the tuning pad 3 has the gag 4, and sender 401 is offered on the gag 4；Sound wave S4 is through the tune
After sound pad 3, the sender 401 is then passed through, sound wave S5 is formed and is finally passed in duct.
A diameter of 3~10mm of the tuning chamber 103, preferably 5.5mm；The thickness of the tuning pad 3 is 0.01~1mm,
It is preferred that 0.5mm；The diameter of tuning pad 3 is less than or equal to the diameter of tuning chamber 103.
As shown in figure 4, in order to further improve tuning quality, after tuning chamber 103 is interior except setting tuning pad 3, may be used also
At nearly ear end, one vibrating diaphragm 9 is set again；The vibrating diaphragm 9 for vibration thin slice, can be used PP, nylon, glass, carbon fiber nonwoven fabric or
Person's Web materials, or even metal material are made；Sound wave S4 first filters through tuning pad 3, forms sound wave S5, the sound wave is in tuning chamber
Propagated in 103, then be filtered into sound wave S6 via vibrating diaphragm 9, further refinement, be transmitted into the ear.
One end of the conduction chamber 102 is nearly ear end, and the other end of the conduction chamber 102 is remote ear end；The stopper 2
Big end is nearly ear end, and the small end of the stopper 2 is remote ear end；Accordingly even when stopper 2 loosens, come off out of conduction chamber 102,
Yet inside muffler, it will not lose because dropping.
Because noise rejection chamber 3 is slotted on its outer surface by the stopper 2 and formed, can be as needed, do
It is relatively thin, it is longer, high frequency noise can effectively be restrained, production technology is simpler, and manufacturing cost is relatively low.
As shown in figure 5, the present embodiment also provides a kind of noise reduction earplug, by 8 groups of above-mentioned selecting type muffler 7 and earplug body
Conjunction forms, and earplug body 8 has multilayer fin 801, can effectively be bonded duct, makes external sound wave can only be through selecting type muffler 7
After filtering, it can just be transmitted into the ear.
Although the foregoing describing the embodiment of the present invention, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
On the premise of principle and essence from the present invention, various changes or modifications can be made to these embodiments, but these are changed
Protection scope of the present invention is each fallen within modification.
Claims (12)
1. a kind of selecting type muffler, it is characterised in that it includes a cock body, a stopper, a tuning pad, a gag and one and entered
Sound switching knob, the remote ear end of the cock body are provided with knob installation room, conduction chamber are offered in the cock body, and the conduction chamber is put
Rear side in knob installation room, the conduction chamber be a cylinder or reverse taper, on the remote ear side wall for conducting chamber
Offer sound inlet, the sound inlet connect with the conduction chamber, and the conduction intracavitary plug is provided with the stopper, the stopper and
The conduction chamber fits, and the stopper is a cylinder or cone, and the nearly ear end of the cock body is provided with tuning chamber, the plug
The end at the nearly ear end of the cock body is covered on, the tuning pad is fixed between the gag and the tuning chamber, it is described
Enter sound switching knob and the conduction intracavitary is rotatably connected in by knob installation room, the outer surface of the stopper offers vertically
One groove run through, the inner surface of groove and the conduction chamber on the outer surface of the stopper form noise rejection chamber, the gag
On offer sender.
2. selecting type muffler as claimed in claim 1, it is characterised in that it is described enter sound switching knob include a knob hand
Handle, an installation sticking part and one enter sound rotary plunger, and the side of the installation sticking part is fixed with the joystick knob, opposite side
Be fixed with it is described enter sound rotary plunger, it is described enter sound rotary plunger be non-completely circular structure；
The joystick knob is placed on the outside of the end at the remote ear end of the cock body, and a part for the installation sticking part is arranged on institute
State knob installation interior, another part extends to the conduction intracavitary, another part of the installation sticking part and the conduction
The wall of chamber is bonded completely, it is described enter sound rotary plunger side with it is described conduction chamber inwall be completely bonded, opposite side is provided with
Gap makes the sound into the sound inlet enter conduction intracavitary.
3. selecting type muffler as claimed in claim 1, it is characterised in that the conduction chamber is reverse taper, the stopper
For cone, the cone gradient of the stopper is equal to the chamber cones gradient of the conduction chamber；Or the conduction chamber is cylinder
Body, the stopper are cone；Or the conduction chamber is cone, the stopper is cylinder；Or the conduction chamber
It is cylinder with the stopper.
4. selecting type muffler as claimed in claim 1, it is characterised in that the diameter of the middle part of the conduction chamber is small
In or equal to both ends diameter, it is described conduction chamber middle part a diameter of 0.5~4mm, it is described conduction chamber both ends it is straight
Footpath is 0.5~4mm, and the length of the conduction chamber is 5~25mm.
5. selecting type muffler as claimed in claim 4, it is characterised in that the diameter of the middle part of the conduction chamber
For 1.8mm, a diameter of 2mm at the both ends of the conduction chamber, the length of the conduction chamber is 12mm.
6. selecting type muffler as claimed in claim 4, it is characterised in that it is described conduction chamber diameter along nearly ear end to
Remote ear extreme direction, which is progressively reduced until, reaches gradually increase again after minimum diameter, and the diameter of the conduction chamber, which is progressively reduced until, to be reached
Length to smallest diameter portion is more than or equal to the length of the cock body.
7. selecting type muffler as claimed in claim 4, it is characterised in that the stopper is cone, the stopper
Outside diameter is 0.5~4mm, and the end diameter of the stopper is 0.5~4mm, and the length of the stopper is 1mm-25mm.
8. selecting type muffler as claimed in claim 7, it is characterised in that the outside diameter of the stopper is 2mm, described
The end diameter of stopper is 1.7mm, and the length of the stopper is 3.5mm.
9. selecting type muffler as claimed in claim 1, it is characterised in that the depth of the groove is 0.05~0.8mm.
10. selecting type muffler as claimed in claim 1, it is characterised in that a diameter of 3~10mm of the tuning chamber,
The thickness of the tuning pad is 0.01~1mm, and the diameter of the tuning pad is less than or equal to the diameter of the tuning chamber.
11. selecting type muffler as claimed in claim 1, it is characterised in that the nearly ear end of the tuning chamber, which is fixed with, to shake
Film, remote ear end are fixed with the tuning pad, and the vibrating diaphragm is vibration thin slice.
12. a kind of noise reduction earplug, it is characterised in that its selecting type for including as described in any one in claim 1-11 is disappeared
Sound device and earplug body, the earplug body have one or more layers fin, and the nearly ear end of the selecting type muffler is inserted in institute
Filling in hole for earplug body is stated, the internal diameter for filling in hole is less than the external diameter at the nearly ear end of the selecting type muffler.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710919250.9A CN107684488B (en) | 2017-09-30 | 2017-09-30 | Selectable muffler and noise reduction earplug comprising same |
| PCT/CN2017/108301 WO2019061638A1 (en) | 2017-09-30 | 2017-10-30 | Selective sound attenuation device and noise-cancelling earplug having same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710919250.9A CN107684488B (en) | 2017-09-30 | 2017-09-30 | Selectable muffler and noise reduction earplug comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107684488A true CN107684488A (en) | 2018-02-13 |
| CN107684488B CN107684488B (en) | 2023-08-25 |
Family
ID=61154106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710919250.9A Active CN107684488B (en) | 2017-09-30 | 2017-09-30 | Selectable muffler and noise reduction earplug comprising same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107684488B (en) |
| WO (1) | WO2019061638A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7439885B2 (en) | 2018-12-25 | 2024-02-28 | 株式会社Ｊｖｃケンウッド | Earplug |
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| CN106132364A (en) * | 2014-04-17 | 2016-11-16 | 蔡昇昊 | Earplug and the earplug assembly including it |
| CN105012073A (en) * | 2015-07-25 | 2015-11-04 | 鲁建辉 | Denoising earplug |
| CN206239601U (en) * | 2016-07-25 | 2017-06-13 | 珠海卓力声科技有限公司 | Earplug filters fuse and earplug |
| CN206370934U (en) * | 2016-12-30 | 2017-08-01 | 佳禾智能科技股份有限公司 | A kind of earplug of adjustable tonequality |
| CN107049602A (en) * | 2017-05-24 | 2017-08-18 | 孟祥力 | One kind filters earplug of making an uproar |
| CN208511328U (en) * | 2017-09-30 | 2019-02-19 | 江阴思安塑胶防护科技有限公司 | Selecting type muffler and noise reduction earplug including it |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7439885B2 (en) | 2018-12-25 | 2024-02-28 | 株式会社Ｊｖｃケンウッド | Earplug |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107684488B (en) | 2023-08-25 |
| WO2019061638A1 (en) | 2019-04-04 |
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