CN208893066U - A kind of multiple degrees of freedom locking positioning device of leg support - Google Patents
A kind of multiple degrees of freedom locking positioning device of leg support Download PDFInfo
- Publication number
- CN208893066U CN208893066U CN201721649647.2U CN201721649647U CN208893066U CN 208893066 U CN208893066 U CN 208893066U CN 201721649647 U CN201721649647 U CN 201721649647U CN 208893066 U CN208893066 U CN 208893066U
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- China
- Prior art keywords
- leg support
- locking
- terminal pad
- multiple degrees
- freedom
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Abstract
The utility model provides a kind of multiple degrees of freedom locking positioning device of leg support, including locking plate, leg support terminal pad, and locking sleeve, locking plate is mounted on leg support stock, locking plate includes the first tight lock part and the second tight lock part, limit hole is provided on first sticking department, limit hole is waist typed through hole, limit hole and locking axle sleeve are cooperatively connected, locking axle sleeve one end and adjusting I pin joint of bolt, the other end is socketed lock shaft, leg support connection disc side offers loose slot, lock shaft is flexibly connected with leg support terminal pad by bolt in the loose slot, locking sleeve one end and the second tight lock part cooperate, the other end and leg support terminal pad cooperate, fixed leg support above leg support terminal pad.The utility model leg support can multiple degrees of freedom adjust, and lock mode is easy to operate.
Description
Technical field
The utility model relates to the field of medical instrument technology, particularly relate to a kind of multiple degrees of freedom locking positioning dress of leg support
It sets.
Background technique
Leg support is the important medical instrument in lithotomy position operation, and traditional leg support is supported at patient's Tui popliteal, this
Leg support be easy to cause patient leg blood circulation disorder since bearing area is small, and can be to avoid this to the leg support of leg support
Kind secondary injury, therefore calf support leg support is more more and more universal.
The operating beds such as leg support attachment is used by being fixed on the side rail of operating bed two sides, for the ease of making
With operation bedside rail size is typically provided with following several specifications: section 30*10mm, 30*8mm, 25*10mm, 25*8mm, existing
The fixed form for having the fixed device of leg support is two kinds: first is that adjustable screw rod is fixed up and down, this fixed form can only be to longitudinal direction
It is fastened, can not be fastened to lateral, therefore be not fixed firmly, once the meeting that falls off is huge to patient's generation in surgical procedure
Injury；Second is that two-way adjusting screw is fixed, though this mode can fasten simultaneously transverse and longitudinal, and it is complicated for operation, tune need to be cooperated
Both direction is saved, and the pressure area that screw rod is fixed is small, it is fixed unstable, and be easy opposite side rail and cause irreversible damage.
The activity of existing lithotomy position leg support and lock mode are the cooperation of eccentric shaft and eccentric push rod, are rotated by eccentric wheel
Impulse stroke, hemisphere bearing activity or locking are opened by eccentric push rod by pressure, but in existing eccentric shaft structure
Mandril is simple integral type column, and this design has two: first is that when eccentric wheel rotates only to the tangential force of mandril
Can be by the counteracted by pressure of mandril itself rigidity and outside disc spring screw, therefore mandril is extremely easily damaged；Second is that since mandril is
The impulse stroke of rigid member, eccentric wheel is completely converted into the movement travel of mandril, so if not regulating mandril using preceding
Position, the rotation of handle is very difficult, and is easily damaged locking structure.
Leg support needs in leg support are adjusted according to different surgery situations, therefore the multiple degrees of freedom rotation of leg support is ten
Point it is necessary to, but multiple degrees of freedom rotation locking it is also cumbersome, need mostly each direction of motion to be locked respectively,
It is excessively complicated in surgical procedure, it is therefore desirable to which that one kind can make leg support multiple degrees of freedom adjust the locking knot for being convenient for lock operation again
Structure.
Leg support is succinct easy to operate not only for beauty as a kind of operation medical instrument, even more to surgical procedure
A kind of power-assisted, the existing most lever for adjusting oil of leg support is more, and complicated for operation, rivet or adjusting rod are exposed, very influences to perform the operation
Journey.
Utility model content
The utility model is based at least one above-mentioned technical problem, and the multiple degrees of freedom locking for proposing a kind of leg support is fixed
Position device, the technical solution of the utility model are achieved in that
Including side rail folder, eccentric lock structure and leg support locking mechanism, the rail clip main body, adjustable when rail folder includes
Gripping block and handle assembly, side rail clip main body include the first clamping part, the second clamping part and third clamping part, third
Sliding slot is provided on clamping part, gripping block is slidably connected with sliding slot, and gripping block top is provided with the 4th clamping part, the 5th clamping
Portion is provided with backing plate slot on third clamping part, and backing plate slot is for placing backing plate.
Handle assembly includes adjusting screw rod, and side rail clip main body lower part is provided with threaded hole, and adjusting screw rod upper end passes through screw thread
Hole is fixedly connected with gripping block, and lower end is hinged with handle.
Preferably, backing plate slot is rectangle groove body, and depth 2mm, backing plate size is adapted to backing plate slot, with a thickness of 4mm,
Second clamping part and the 4th clamping part width are set as 10mm.
Preferably, backing plate is metal material, is fixedly installed with permanent magnet in backing plate slot.
Preferably, the first clamping part, the 5th clamping part inner wall are set as clinoplain.
Preferably, the first clamping part, the second clamping part, third clamping part and backing plate slot are integrally formed, the 4th clamping
Portion, the 5th clamping part are integrally formed.
Eccentric lock structure includes locking device, hemisphere bearing, eccentric shaft, eccentric push rod, and locking device is with opening
The adjustable U-shaped structure in gap, locking device include that the first sticking department, the second sticking department and bearing groove, hemisphere bearing are mounted on
In bearing groove, bearing support covers one end and is fixedly connected with hemisphere bearing, and the other end is fixedly connected with side rail folder；First sticking department with
Second sticking department is locked by disc spring pressing screw, and disc spring and disc spring pressing screw cooperate, and disc spring pressing screw is hollow structure,
It is internally provided with eccentric push rod, eccentric push rod upper end is slidably connected with eccentric shaft, lower end and the top being fixed in the second sticking department
Lid cooperation, the folding and locking of eccentric push rod and eccentric shaft cooperation control the first sticking department and the second sticking department.Eccentric push rod knot
It is hinged with connecting rod that structure is followed successively by top flat, connecting rod, pressure spring and tail top pillar, top flat from top to bottom.
Preferably, it is fixed with eccentric wheel on eccentric shaft, needle bearing is assembled on eccentric wheel, top flat upper surface is set as circular arc
Shape curved surface, the arc-shaped surface are slidably connected with needle bearing.
Preferably, the impulse stroke of eccentric wheel is 0.7mm.
Preferably, top cover, which is bolted with, adjusts bolt II, adjusts bolt II and eccentric push rod bottom cooperates, be used to adjust partially
Heart mandril impulse stroke.
Leg support locking mechanism includes locking plate, leg support terminal pad and locking sleeve, and locking plate is mounted on leg support stock
On, locking plate is with the adjustable cylindrical structure of opened gap comprising the first tight lock part and the second tight lock part, the first locking
Limit hole is provided in portion, limit hole is waist typed through hole, and limit hole and locking axle sleeve are cooperatively connected, locking axle sleeve one end and adjusting
I pin joint of bolt, the other end are socketed lock shaft, adjust bolt I and are connected with disc spring and regulation handle.Leg support connection disc side offers
Loose slot, lock shaft are flexibly connected with leg support terminal pad by bolt in loose slot, and the second tight lock part is provided with bellmouth, lock
Fixed cylinder one end and bellmouth cooperate, and the other end and leg support terminal pad cooperate, fixed leg support above leg support terminal pad.
Preferably, leg support fixed disk, leg support, leg support fixed disk, leg support terminal pad, locking are provided with above leg support terminal pad
Axis passes sequentially through bolt and is fixedly connected.
Preferably, eccentric shaft end is connected with shaft end set by positioning pin, and positioning pin one end has protrusion, the long boom end of leg support
Equipped with notch, it is preferred that the radian of notch is set as 180 °, the notch and the male cooperation, shaft end set and swing handle
It is fixedly connected by screw rod.
The operating bed leg support, including gas spring, gas spring one end are fixed on the side bottom Gui Jia, and the other end is fixed on
On leg support stock.
The beneficial effects of the utility model are: 1. pairs of patient's calf supports, prevent Bing Ren popliteal portion by secondary injury；2.
Detachable backing plate is set on side rail folder, realizes that the clamping element for different operation bedside rails is switched fast；3. rail folder in side adjusts letter
It is single, multiple clamping parts are set, and holding area is bigger, firm grip, and opposite side rail is avoided to damage；4. it is inclined that multistage linking is arranged
Heart mandril, top flat is hinged with connecting rod, effectively eliminates eccentric wheel to the tangential force of mandril, extends the mandril service life；5. eccentric push rod
Pressure spring is arranged in lower end, offsets eccentric wheel overtravel, prevents locking device from damaging；6. adjusting screw rod is arranged in mandril lower end, can hand
The dynamic effective travel for adjusting eccentric push rod, prevents locking device from damaging；7. leg support can multiple degrees of freedom adjust, and lock mode grasp
Make simple；8. overall structure is beautiful simple, easy to operate, no rivet or control-rod are exposed, influence surgical procedure.
Detailed description of the invention
It, below will be to attached drawing needed in description in order to illustrate more clearly of the technical solution in the utility model
It is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is side rail clamping structure schematic diagram；
Fig. 3 is eccentric lock structural schematic diagram；
Fig. 4 is eccentric push rod structural schematic diagram；
Fig. 5 is leg support locking mechanism schematic diagram；
Connection schematic diagram inside the leg support locking mechanism of the position Fig. 6；
Fig. 7 is swing handle structural schematic diagram；
Fig. 8 is swing handle schematic diagram；
Wherein, in Fig. 1: 10 press from both sides for side rail, and 20 be eccentric lock structure, and 30 be leg support locking mechanism, and 40 be swing handle
Structure, 50 be gas spring, and 60 be leg support；
In Fig. 2: 101 be side rail clip main body, and 102 be gripping block, and 103 be the first clamping part, and 104 be the second clamping part, 105
It is sliding slot for third clamping part, 106,107 be the 4th clamping part, and 108 be the 5th clamping part, and 109 be backing plate slot, and 110 be backing plate,
111 be adjusting screw rod, and 112 be handle, and 113 be permanent magnet, and 200 be bearing support set；
In Fig. 3: 201 be needle bearing, and 202 be hemisphere bearing, and 203 be eccentric shaft, and 204 be eccentric push rod, and 205 be first
Sticking department, 206 be the second sticking department, and 207 be bearing groove, and 208 be disc spring pressing screw, and 209 be disc spring, and 210 be top cover, 211
To adjust bolt II；
In Fig. 4: 212 be top flat, and 213 be connecting rod, and 214 be pressure spring, and 215 be tail top pillar；
In Fig. 5: 300 be limit hole, and 301 be locking plate, and 302 be leg support terminal pad, and 303 be locking sleeve, and 304 be first
Tight lock part, 305 be the second tight lock part, and 306 be regulation handle；
In Fig. 6: 307 is adjust bolt I, and 308 be locking axle sleeve, and 309 be lock shaft, and 310 be disc spring, and 311 be loose slot；
In Fig. 7: 401 be leg support stock, and 402 be notch, and 403 cover for shaft end, and 404 be positioning pin, and 405 be swing handle；
In Fig. 8: 408 be protrusion.
Specific embodiment
In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have
The utility model is further described in detail in body embodiment.It should be noted that in the absence of conflict, this Shen
The feature in embodiment and embodiment please can be combined with each other.
Many details are explained in the following description in order to fully understand the utility model, still, this is practical
Novel to be implemented using other than the one described here other modes, therefore, the protection scope of the utility model is simultaneously
It is not limited by the specific embodiments disclosed below.
As shown in Fig. 1 ~ Fig. 8, the utility model includes side rail folder 10, eccentric lock structure 20 and leg support locking mechanism
30, as shown in Fig. 2, rail clip main body 101, adjustable gripping block 102 and handle assembly when rail folder 10 includes, side rail folder
Main body 101 is an integral molding structure comprising the first clamping part 103, the second clamping part 104 and third clamping part 105, the
Sliding slot 106 is provided on three clamping parts 105, gripping block 102 is slidably matched with sliding slot 106, and can slide in sliding slot 106, folder
Tight 102 upper end of block is provided with the 4th clamping part 107, the 5th clamping part 108, and above-mentioned five clamping parts form longitudinally adjustable folder
Tight device is provided with backing plate slot 109 on third clamping part, and backing plate slot is for placing backing plate 110, and the dismounting of backing plate 110 is for adjusting
Save the lateral dimension of clamping device.
Handle assembly includes adjusting screw rod 111, and rail clip main body 101 lower part in side is provided with threaded hole, 111 upper end of adjusting screw rod
It is fixedly connected across threaded hole with gripping block 102, the lifting of gripping block 102, adjusting screw rod is controlled by rotation adjusting screw rod 111
111 lower end is hinged with handle 112, and handle 112 can be adjusted to perpendicular or parallel with adjusting screw rod 111 as needed, prevents shadow
Ring surgical procedure.
Preferably, backing plate slot 109 is rectangular channel, is mounted therein with permanent magnet 113, and setting backing plate 110 is metal material, just
In the installation of backing plate 110.
Preferably, the depth that backing plate slot 109 is arranged is 2mm, and 110 size of backing plate is adapted to backing plate slot 109, and backing plate 110 is thick
Degree is 4mm, and the second clamping part 104 and 107 width of the 4th clamping part are set as 10mm, can adapt to 8mm and 10mm thickness simultaneously
Operation bedside rail.
Preferably, the first clamping part 103,108 inner wall of the 5th clamping part are set for clinoplain, convenient for operation bedside rail
Clamping and fastening.
As shown in Figure 2 and Figure 3, eccentric lock structure 20 includes locking device, hemisphere bearing 202, eccentric shaft 203, eccentric top
Bar 204, locking device are with the adjustable U-shaped structure of opened gap, and locking device is locked including the first sticking department 205, second
Portion 206 and bearing groove 207, hemisphere bearing 202 are mounted in bearing groove 207, and bearing support covers 200 one end and hemisphere bearing
202 are fixedly connected, and the other end is fixedly connected with side rail folder 10, the activity on bearing support set 200 of hemisphere bearing 202.First lock
Determine portion 205 and the second sticking department 206 to lock by disc spring pressing screw 208, disc spring 209 and disc spring pressing screw 208 cooperate, dish
Spring pressing screw 208 is hollow structure, is internally provided with eccentric push rod 204, and 204 upper end of eccentric push rod and eccentric shaft 203 slide
Connection, lower end cooperate with the top cover 210 being fixed in the second sticking department 206, and eccentric push rod 204 and the cooperation of eccentric shaft 203 control
The folding and locking of first sticking department 205 and the second sticking department 206, eccentric shaft 203 to applying pressure above eccentric push rod 204,
Eccentric push rod 204 is pressed downward top cover 210, so that gap between the second sticking department 206 and the first sticking department 205 is driven to open, half
Ball bearing 202 is in active state.
As shown in figure 4,204 structure of eccentric push rod be followed successively by from top to bottom top flat 212, connecting rod 213, pressure spring 214 and
Tail top pillar 215, top flat 212 and connecting rod 213 are hinged.In the eccentric lock structure of traditional leg support, eccentric push rod sets for integral type
Meter, mandril can not eliminate the tangential force of eccentric shaft, be easily damaged, in the utility model between top flat 212 and connecting rod 213
Articulated structure is set, effectively eliminates eccentric wheel to the tangential force of mandril, extends the service life of mandril, while eccentric push rod 204
Pressure spring 214 is arranged in lower end, offsets eccentric wheel overtravel, and operation is lighter, prevents the excessive damage locking structure of pressure.
Preferably, it is fixed with eccentric wheel on eccentric shaft 203, assembles needle bearing 201,212 upper surface of top flat on eccentric wheel
It is set as arc-shaped surface, arc-shaped surface is slidably connected with needle bearing 201.
Preferably, the impulse stroke of eccentric wheel is 0.7mm.
Preferably, top cover, which is bolted with, adjusts bolt II 211, adjusts bolt II 211 and 204 bottom of eccentric push rod cooperates, lead to
Cross the impulse stroke that rotation adjusts II 211 controllable adjustable eccentric push rod 204 of bolt.
As shown in Fig. 5 ~ Fig. 7, leg support locking mechanism 30 includes locking plate 301, leg support terminal pad 302 and locking sleeve
303, locking plate 301 is mounted on leg support stock 401, and locking plate 301 is to pass through with the adjustable cylindrical structure of opened gap
The adjusting of opened gap can control locking mechanism fixed on leg support stock 401 and activity, and locking plate 301 includes the first locking
Portion 304 and the second tight lock part 305, limit hole 300 is provided on the first tight lock part 304, and limit hole 300 is waist typed through hole, limit
Hole 300 and locking axle sleeve 308 cooperate, and 308 one end of locking axle sleeve and adjusting I 307 pin joint of bolt, the other end are socketed lock shaft 309,
It adjusts I 307 other end of bolt and is connected with disc spring 310 and regulation handle 306.302 side of leg support terminal pad offers section as fan
The loose slot 311 of shape, lock shaft 309 are flexibly connected with leg support terminal pad 302 by bolt in loose slot 311, the second locking
Portion 305 is provided with bellmouth, and 303 one end of locking sleeve and bellmouth cooperate, and the other end and leg support terminal pad 302 cooperate, leg support
Leg support 60 is fixed above terminal pad 302.
Preferably, leg support fixed disk, leg support 60, leg support fixed disk, leg support terminal pad are provided with above leg support terminal pad 302
302, lock shaft 309 passes sequentially through bolt and is fixedly connected.
Above-mentioned leg support locking mechanism can make leg support realize that multiple degrees of freedom is adjusted: leg support locking mechanism can be in leg support stock along long
Bar slides axially, leg support terminal pad can be around lock shaft along the rotation of itself circumferencial direction, leg support terminal pad in sector movable slot
Axial rotation realizes that the multiple freedom degree foldings of a locking mechanism controls and locking, user of service can be according to specific needs of performing the operation
Leg support is adjusted to most suitable position.
As shown in Figure 7, Figure 8,203 end of eccentric shaft is connected with shaft end set 403,404 one end of positioning pin tool by positioning pin 404
There is protrusion 408,401 end of leg support stock is equipped with notch 402, it is preferred that the radian of notch 402 is set as 180 °, the notch
402 are fixedly connected with swing handle 405 by screw rod with raised 408 cooperation, shaft end set 403.Traditional leg support leg support stock
It is separately designed with swing handle, structure is complicated, and the control structure of eccentric shaft 203 is arranged in leg support stock 401 this programme, makes
Leg support structure is more beautiful, while matches the protrusion 408 being arranged in swing handle 405 with the notch 402 on leg support stock 401
It closes, the unlock and locking of leg support can be completed in operator's one hand twisting swing handle, easy to operate.
Preferably, the operating bed of the utility model is fixed on side with gas spring 50,50 one end of gas spring is provided in leg support
Rail presss from both sides 10 bottoms, and the other end is fixed on leg support stock 401, and gas spring 50 can easily move in power-assisted medical staff's surgical procedure
Patient leg to required position prevents patient by secondary injury without carrying patient leg off.
The technical solution of the utility model is had been described in detail above with reference to the accompanying drawings, the specific implementation process of the utility model is
It is such:
For side rail folder for leg support to be fixed on operation bedside rail, medical staff can be according to the specific ruler of operation bedside rail
It is very little, backing plate is placed or removes, side rail is placed in the first clamping part, the second clamping part, third clamping part, the 4th folder by rotational handle
It holds and is clamped between portion and the 5th clamping part.
Due to the effect of disc spring pressing screw and disc spring, the first sticking department and the second sticking department are in impaction state, therefore
Hemisphere bearing is in the lock state, and drives eccentric shaft turns when medical staff twists swing handle, eccentric shaft drives eccentric push rod
The first sticking department and the second sticking department are pressed off downwards, hemisphere bearing is in active state at this time, and medical staff can be according to specific need
Adjust the position of leg support, the locking of eccentric shaft return back leg.Medical staff can be according to hand rotation pressure and bearing activity
Effect adjusts the adjusting bolt II on top cover.
After leg support is adjusted to suitable position, by rotating regulation handle, gap is contracted between the first tight lock part and the second tight lock part
Small, leg support is fixed on leg support stock, while locking axle sleeve pulls lock shaft, i.e. locking plate, locking sleeve and leg support terminal pad
Between lock, Convenient table restitope is set.
Through the above technical solutions, the utility model holding area is big, more stable, surgical procedure is safer；It adapts to not
With operation bedside rail, adjust simple；Eccentric push rod is designed using multistage, is eliminated eccentric wheel to the tangential force of mandril, is extended leg support
Service life；Pressure spring is arranged in eccentric push rod lower end, offsets eccentric wheel overtravel, prevents locking device from damaging；Mandril lower end is set
Adjusting screw rod is set, different users is suitble to use；Leg support can multiple degrees of freedom adjust, and lock mode is easy to operate；Architectonic beauty
It sees succinctly, easy to operate, structure is simple, avoids influencing surgical procedure.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of multiple degrees of freedom locking positioning device of leg support, including locking plate, leg support terminal pad and locking sleeve, described
Locking plate is mounted on leg support stock, which is characterized in that the locking plate be with the adjustable cylindrical structure of opened gap,
Including the first tight lock part and the second tight lock part, limit hole is provided on first tight lock part, the limit hole is waist typed through hole,
The limit hole and locking axle sleeve are cooperatively connected, described locking axle sleeve one end and adjusting I pin joint of bolt, other end socket locking
Axis, the leg support connection disc side offer loose slot, and the lock shaft is logical with the leg support terminal pad in the loose slot
Bolt flexible connection is crossed, described locking sleeve one end and second tight lock part cooperate, and the other end is matched with the leg support terminal pad
It closes, fixed leg support above the leg support terminal pad.
2. the multiple degrees of freedom locking positioning device of leg support according to claim 1, which is characterized in that second tight lock part
It is provided with the bellmouth that section is truncated conical shape, described locking sleeve one end is set as tapered surface and bellmouth cooperates, the other end
Disc side cooperation is connect with the leg support for arc-shaped surface.
3. the multiple degrees of freedom locking positioning device of leg support according to claim 1 or 2, which is characterized in that the leg support connects
It connects and is provided with leg support fixed disk above disk, the leg support, leg support fixed disk, leg support terminal pad, lock shaft pass sequentially through bolt company
It connects.
4. the multiple degrees of freedom locking positioning device of leg support according to claim 1 or 2, which is characterized in that the adjusting spiral shell
Bolt I is connected with disc spring and regulation handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721649647.2U CN208893066U (en) | 2017-12-01 | 2017-12-01 | A kind of multiple degrees of freedom locking positioning device of leg support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721649647.2U CN208893066U (en) | 2017-12-01 | 2017-12-01 | A kind of multiple degrees of freedom locking positioning device of leg support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208893066U true CN208893066U (en) | 2019-05-24 |
Family
ID=66564749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721649647.2U Expired - Fee Related CN208893066U (en) | 2017-12-01 | 2017-12-01 | A kind of multiple degrees of freedom locking positioning device of leg support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208893066U (en) |
-
2017
- 2017-12-01 CN CN201721649647.2U patent/CN208893066U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190524 Termination date: 20211201 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |