CN208492356U - U-shaped intelligent electric toothbrush - Google Patents

U-shaped intelligent electric toothbrush Download PDF

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Publication number
CN208492356U
CN208492356U CN201721340882.1U CN201721340882U CN208492356U CN 208492356 U CN208492356 U CN 208492356U CN 201721340882 U CN201721340882 U CN 201721340882U CN 208492356 U CN208492356 U CN 208492356U
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CN
China
Prior art keywords
bottle
paste storage
equipment
driver
storage bottle
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.)
Expired - Fee Related
Application number
CN201721340882.1U
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Chinese (zh)
Inventor
欧阳博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Huahangsheng Technology Co ltd
Original Assignee
Shenzhen Huahangsheng Technology Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority to CN201721340882.1U priority Critical patent/CN208492356U/en
Application granted granted Critical
Publication of CN208492356U publication Critical patent/CN208492356U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of U-shaped intelligent electric toothbrushes, including facing brush and driver;The facing brush is connect with detachable connection type with the driver, and connection is connected with the liquid guiding cavity of driver in the catheter of facing brush;The driver includes paste storage bottle and equipment accommodates bottle, and the paste storage bottle is accommodated bottle with equipment and is connected with detachable connection type;The liquid guiding cavity and pipette are equipped in the paste storage bottle, the inlet and liquid outlet of the liquid guiding cavity are located at the bottom end and top of the paste storage bottle, and connection is connected with the catheter in the liquid outlet on top;The vibrating motor is fixedly installed in equipment and accommodates on the inner wall of bottle, and the input terminal of the control circuit board and the power supply are conductively connected, and the output end of control circuit board and the electrodynamic pump and vibrating motor are conductively connected.The utility model extends brushing time, improves cleaning effect, reduces the damage to gum, improves the protection to tooth.

Description

U-shaped intelligent electric toothbrush
Technical field
The utility model relates to electric toothbrush technology fields, and in particular to a kind of U-shaped intelligent electric toothbrush.
Background technique
Electric toothbrush is that brush head is made to rotate and vibrate to achieve the effect that clean one's teeth with high-speed motor.Electric toothbrush is close several The new product that year occurs has started a revolution of oral hygiene in foreign countries.Although electric toothbrush is in the application in China It does not popularize still, but someone predicts, it will become important a member in public health care product.Investigation display, electric toothbrush and common Toothbrush is compared, more scientific effective.Plaque can more be thoroughly removed, reduce gingivitis and bleeding gums, and is American-European at present The generally popular daily necessities of many countries.And electric toothbrush is by quickly rotating, and brush head is made to generate high-frequency vibration, moment is by toothpaste Subtle foam is resolved into, teeth space is deeply cleaned.At the same time, the trembling of bristle can promote the blood circulation in oral cavity, to gum group It is woven with unexpected massage effect.
There are three types of the motion modes of current electric toothbrush head: one is brush heads to do reciprocating linear motion, and one is works Rotary motion, there are also complete electric toothbrushes a kind of and there are two types of brush head.Existing electric toothbrush, using traditional toothbrush bristle, knot Closing motor oscillating makes toothpaste be more prone to produce foam, gos deep into the dirt of teeth space cleaning deeper.
But because tooth is there are three face when brushing teeth, need to be on the move when using existing above-mentioned electric toothbrush, Naturally relatively time-consuming, but be often no more than three seconds according to each position brushing time of personal habits, so that can not be thorough Clean the foreign matter in teeth space.In addition, different according to everyone use habit, the user having when brushing teeth is firmly larger, will On the tooth that bristle presses with strength, certain damage can be caused to gum softer bristle.
Utility model content
For the defects in the prior art, the utility model provides a kind of U-shaped intelligent electric toothbrush, when being brushed teeth with extending Between, cleaning effect is improved, the damage to gum is reduced, improves the protection to tooth.
The utility model provides a kind of U-shaped intelligent electric toothbrush, including facing brush and driver;The facing brush is with removable The connection type divided is connect with the driver, and connection is connected with the liquid guiding cavity of driver in the catheter of facing brush;It is described Driver includes paste storage bottle and equipment accommodates bottle, and the paste storage bottle and equipment accommodate bottle with detachable connection type It is connected;The liquid guiding cavity and pipette are equipped in the paste storage bottle, the inlet and liquid outlet of the liquid guiding cavity distinguish position In the bottom end and top of the paste storage bottle, and connection is connected with the catheter in the liquid outlet on top;The equipment is held Bottle of receiving is interior to be equipped with electrodynamic pump, foam maker, vibrating motor, power supply and control circuit board, the inlet tube of the electrodynamic pump and institute Pipette conducting connection is stated, connection is connected with the inlet of liquid guiding cavity by foam maker in the drain pipe of electrodynamic pump, and then makes Toothpaste fluid in paste storage bottle is successively expelled to institute by foam maker, liquid guiding cavity and catheter under the action of electrodynamic pump It states in facing brush;The vibrating motor be fixedly installed in equipment accommodate bottle inner wall on, the input terminal of the control circuit board with The power supply is conductively connected, and the output end of control circuit board and the electrodynamic pump and vibrating motor are conductively connected.
Preferably, the upper surface of described facing brush is equipped with upper occlusal crib compatible with upper row's tooth, sets below facing brush Have a lower occlusal crib compatible with lower row's tooth, and the both sides of upper occlusal crib and lower occlusal crib be equipped with it is multiple rows of for cleaning tooth The bristle of tooth;Be equipped with the catheter in the upper occlusal crib and in lower occlusal crib, and two catheters be equipped with it is multiple Drainage hole.After upper row's tooth and lower row's dental articulation are in corresponding upper occlusal crib and lower occlusal crib, multiple rows of bristle on both sides Dental surface and teeth crevice are cleaned and are massaged, and the toothpaste fluid of foam-like is constantly discharged in the drainage hole of catheter, Keep cleaning effect more preferable.
Preferably, connection, and the bottom of the facing brush is connected in the catheter in the upper occlusal crib and in lower occlusal crib End is equipped with to the inlet opening of upper occlusal crib and the catheter feed flow of lower occlusal crib, and magnet is equipped at the inlet opening.
Preferably, the fluid hole of the liquid guiding cavity is located at the top of the driver, and magnet is equipped at the fluid hole, and And the magnet at the magnet and fluid hole at the inlet opening is attracting, and then connects facing brush with driver.Pass through magnet phase Facing brush and driver are quickly connected and are split by the principle of suction, and connection and fractionation are very simple, are made more convenient to use.This Outside, inlet opening and fluid hole are just connected automatically after facing brush is connected with driver.
Preferably, the bottom wall of the paste storage bottle is adapted with the roof that the equipment accommodates bottle, and paste storage The roof that the bottom wall and equipment of bottle accommodate bottle is connected by a snap, and then so that paste storage bottle is accommodated bottle with equipment and connected to form ball The driver of body shape.The bottom wall of paste storage bottle firmly docks after being aligned with the roof that equipment accommodates bottle just to be made to snap connection, even It is simple to connect mode, when needing to split, paste storage bottle and equipment are firmly accommodated into bottle toward pulling open on the contrary.
Preferably, the paste storage bottle is equipped with liquid filling hole, and liquid filling hole is equipped with corresponding stopple.When toothpaste fluid is finished Afterwards, toothpaste fluid is added by bottoming hole.
Preferably, the pipette is hose, and the imbibition end of pipette is equipped with weight.When in use, paste storage The orientation of bottle constantly changes, in the liquid level of toothpaste fluid also constantly changing, the imbibition end of pipette under the action of weight, It is maintained at imbibition end at minimum liquid level, in the case where toothpaste fluid abundance, imbibition can be made during shaking End is maintained at liquid level, and hereinafter, avoiding electrodynamic pump, there is a situation where suctions.
Preferably, the pipette outside the bottle of the first sealing-plug and the paste storage bottle by being connected, the inlet tube It accommodates to be connected outside the bottle of bottle by the second sealing-plug and the equipment and connect, and after paste storage bottle is connected with equipment receiving bottle Make first sealing-plug and the second sealing-plug that connection be connected.It is close by first after paste storage bottle is connected with equipment receiving bottle Blocking and the second sealing-plug make pipette and the seamless conducting connection of inlet tube, solve leakproofness after pipette is connected with inlet tube Bad problem.
Preferably, it is additionally provided in the driver for the wireless charging receiving coil to the power source charges, the nothing Line charge electricity receiving coil and the input terminal of the control circuit board are conductively connected.Power supply is rechargeable lithium battary, by wireless Receiving coil charge to power source charges, does not need charging cable connection charging, makes to charge more convenient.
Preferably, the bottom that the equipment accommodates bottle is equipped with switch button, and the switch button is conductively connected in institute It states between control circuit board and power supply.
The beneficial effects of the utility model are embodied in:
The utility model provides a kind of U-shaped intelligent electric toothbrush, including facing brush and driver, the driver include tooth Cream holding bottle and equipment accommodate bottle.The facing brush is connect with detachable connection type with the driver, the same driving Device can be equipped with multiple facing brushes, and the big ting model of the facing brush of adult and child is different, different for the same family People using when only need replacing facing brush side and can be used, the detachable connection type of facing brush and driver makes replacement letter It is single, it is convenient.It is connected before use, facing brush is accommodated bottle with equipment with driver and paste storage bottle.Equipment accommodates in bottle Vibrating motor generates the bristle that vibration paints facing and generates vibration, and then cleans dental surface and teeth space.Facing brush will be upper It arranges tooth and lower row's tooth all covers, and upper row's tooth and lower row's tooth are cleaned simultaneously, do not need to move back and forth Facing brush, is on the move.It is all the same to the scavenging period of every tooth, overcome that brushing time is short, and cleaning effect is paid no attention to The problem of thinking, to reduce the damage to gum, improves in addition, contact dynamics of the facing brush with tooth is controlled without user Protection to tooth.While brushing teeth, the toothpaste fluid in paste storage bottle is successively sent out by foam under the action of electrodynamic pump Raw device, liquid guiding cavity and catheter are expelled in the occlusal crib of the facing brush, are kept cleaning tooth more thorough, are reduced gum disease.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar Element or part are generally identified by similar appended drawing reference.In attached drawing, each element or part might not be according to actual ratios It draws.
Fig. 1 is the structural schematic diagram of the utility model;
Fig. 2 is the enlarged drawing in Fig. 1 at A.
In attached drawing, 1- facing brush, 2- driver, 3- occlusal crib, 4- bristle, 5- catheter, 6- liquid guiding cavity, 7- magnet, 8- Paste storage bottle, 9- equipment accommodate bottle, 10- stopple, 11- cooling gas check valve, 12- pipette, 13- buckle, 14- weight, 15- electricity Dynamic pump, 16- foam maker, 17- vibrating motor, 18- power supply, 19- control circuit board, 20- drain pipe, 21- inlet tube, 22- First sealing-plug, the second sealing-plug of 23-, 24- wireless charging receiving coil, 25- switch button, 26- drainage hole, the gap 27-
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solutions of the utility model.Following embodiment is only For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation Novel protection scope.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this reality The ordinary meaning understood with novel one of ordinary skill in the art.
As shown in Figure 1, present embodiments providing a kind of U-shaped intelligent electric toothbrush, including facing brush 1 and driver 2.Facing The upper surface of brush 1 is equipped with upper occlusal crib 3 compatible with upper row's tooth, is equipped with below facing brush 1 compatible with lower row's tooth Lower occlusal crib 3, and the both sides of upper occlusal crib 3 and lower occlusal crib 3 are equipped with multiple rows of bristle 4 for being used to clean tooth.Facing brush 1 It is connect with detachable connection type with driver 2, and the liquid guiding cavity 6 of the catheter 5 of facing brush 1 and driver 2 is connected and connects It connects.It is equipped with catheter 5 in upper occlusal crib 3 and in lower occlusal crib 3, and two catheters 5 are equipped with multiple drainage holes 26.It leads The fluid hole of sap cavity 6 is located at the top of driver 2, and magnet 7, and magnet 7 and fluid hole at inlet opening are equipped at fluid hole The magnet 7 at place is attracting, and then facing brush 1 and driver 2 is made to form detachable connection type.Pass through the attracting principle of magnet 7 By quickly connection and the fractionation of facing brush 1 and driver 2, connection and fractionation are very simple, make more convenient to use.In addition, facing Inlet opening and fluid hole are just connected automatically after brush 1 and driver 2 connect.
As depicted in figs. 1 and 2, driver 2 includes paste storage bottle 8 and equipment accommodates bottle 9, and paste storage bottle 8, which is equipped with, to be added Fluid apertures, and liquid filling hole is equipped with corresponding stopple.Paste storage bottle 8 is accommodated bottle 9 with equipment and is connected with detachable connection type. The bottom wall of paste storage bottle 8 is adapted with the roof that equipment accommodates bottle 9, and the bottom wall of paste storage bottle 8 and equipment accommodate bottle 9 Roof by 13 connection of buckle, and then so that paste storage bottle 8 and equipment is accommodated the connection of bottle 9 and form spherical driver 2.Tooth The bottom wall of cream holding bottle 8 firmly docks just after being aligned with the roof that equipment accommodates bottle 9 makes 13 connection of buckle, and connection type is simple, When needing to split, paste storage bottle 8 and equipment are firmly accommodated into bottle 9 toward pulling open on the contrary.The roof that equipment accommodates bottle 9 is set There is venthole, and venthole is equipped with cooling gas check valve 11, cooling gas check valve 11 passes through the inlet tube 21 of tube body and electrodynamic pump 15 Conducting connection.Buckle 13 is equipped with the gap 27 for making venthole and extraneous ventilation.It is equipped with liquid guiding cavity 6 in paste storage bottle 8 and inhales Liquid pipe 12, the inlet and liquid outlet of liquid guiding cavity 6 are located at the bottom end and top of paste storage bottle 8, and the liquid out on top Mouth is connected with the conducting of catheter 5.Pipette 12 is hose, and the imbibition end of pipette 12 is equipped with weight 14.When in use, tooth The orientation of cream holding bottle 8 constantly changes, in the liquid level of toothpaste fluid also constantly changing, the imbibition end of pipette 12 is in weight Under the action of 14, it is maintained at imbibition end at minimum liquid level, in the case where toothpaste fluid abundance, even if during shaking Also imbibition end can be made to be maintained at liquid level, and hereinafter, avoiding electrodynamic pump 15, there is a situation where suctions.Equipment, which accommodates, is equipped with electrodynamic pump in bottle 9 15, foam maker 16, vibrating motor 17, power supply 18 and control circuit board 19, vibrating motor 17 are fixedly installed in equipment receiving On the inner wall of bottle 9, the input terminal and power supply 18 of control circuit board 19 are conductively connected, the output end and electrodynamic pump of control circuit board 19 15 and vibrating motor 17 be conductively connected.Inlet tube 21 and pipette 12 conducting of electrodynamic pump 15 connect, the drain pipe of electrodynamic pump 15 20 are connected connection with the inlet of liquid guiding cavity 6 by foam maker 16, and then make the toothpaste fluid in paste storage bottle 8 electronic It is successively expelled in facing brush 1 by foam maker 16, liquid guiding cavity 6 and catheter 5 under the action of pump 15.Electrodynamic pump 15 passes through Cooling gas check valve 11 and pipette 12 suck toothpaste fluid and air simultaneously, facilitate toothpaste fluid after mixing in electrodynamic pump 15 Form foam-like.For pipette 12 by being connected outside the first sealing-plug 22 and the bottle of paste storage bottle 8, inlet tube 21 is close by second Blocking 23 and equipment are accommodated to be connected outside the bottle of bottle 9 and connect, and paste storage bottle 8 and equipment accommodate make after the connection of bottle 9 it is first close Blocking 22 and the conducting connection of the second sealing-plug 23.After paste storage bottle 8 and equipment accommodate the connection of bottle 9, pass through the first sealing-plug 22 Connect pipette 12 and the seamless conducting of inlet tube 21 with the second sealing-plug 23, after solving pipette 12 and the connection of inlet tube 21 The problem of poor sealing.The wireless charging receiving coil 24 for charging to power supply 18, wireless charging are additionally provided in driver 2 Receiving coil 24 and the input terminal of control circuit board 19 are conductively connected.Power supply 18 is rechargeable lithium battary, passes through wireless charging Receiving coil 24 charges to power supply 18, does not need charging cable connection charging, makes to charge more convenient.The bottom of equipment receiving bottle 9 Equipped with switch button 25, and switch button 25 is conductively connected between control circuit board 19 and power supply 18.
Bristle 4 is made of antibacterial environment protection silica gel in the present embodiment, rationally designs soft brush according to human teeth's structure and shape Hair 4.The stopple 10 on paste storage bottle 8 is opened, toothpaste fluid is injected into rear cover tieholen plug 10 in paste storage bottle 8, by facing brush 1 It is put into mouth, upper row's tooth and lower row's tooth bite in upper occlusal crib 3 accordingly and in lower occlusal crib 3.Click switch button 25, on the one hand, vibrating motor 17 works and bristle 4 is driven to vibrate, to clean to dental surface and teeth space, while right Gingiva tissue is massaged.Another aspect toothpaste fluid and air are mixed into electrodynamic pump 15 by the even action of electrodynamic pump 15 And entered in foam maker 16 by drain pipe 20.Foam maker 16 is cylindrical body, and is distributed in cylindrical body very much Pore, when the toothpaste fluid of toothpaste fluid and air by these pore back generation foam-like in foam maker 16.Foam-like Toothpaste fluid be expelled in the occlusal crib 3 of facing brush 1 by liquid guiding cavity 6 and catheter 5.To the toothpaste fluid and bristle of foam-like 4 pairs of upper row's teeth and lower row's tooth clean simultaneously, do not need to move back and forth facing brush 1, be on the move.To every tooth The scavenging period of tooth is all the same, overcomes that brushing time is short, the undesirable problem of cleaning effect, in addition, facing brush 1 and tooth Contact dynamics is controlled without user, to reduce the damage to gum, improves the protection to tooth.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System;Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced;And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.

Claims (10)

1. a kind of U-shaped intelligent electric toothbrush, it is characterised in that: including facing brush and driver;The facing brush is with detachable Connection type is connect with the driver, and connection is connected with the liquid guiding cavity of driver in the catheter of facing brush;The driving Device includes paste storage bottle and equipment accommodates bottle, and the paste storage bottle and equipment accommodate bottle with detachable connection type phase Even;The liquid guiding cavity and pipette are equipped in the paste storage bottle, the inlet and liquid outlet of the liquid guiding cavity are located at The bottom end and top of the paste storage bottle, and connection is connected with the catheter in the liquid outlet on top;The equipment accommodates Bottle in be equipped with electrodynamic pump, foam maker, vibrating motor, power supply and control circuit board, the inlet tube of the electrodynamic pump with it is described Pipette conducting connection, connection is connected with the inlet of liquid guiding cavity by foam maker in the drain pipe of electrodynamic pump, and then makes tooth Toothpaste fluid in cream holding bottle is successively expelled to by foam maker, liquid guiding cavity and catheter described under the action of electrodynamic pump In facing brush;The vibrating motor is fixedly installed in equipment and accommodates on the inner wall of bottle, the input terminal of the control circuit board and institute It states power supply conductive connection, the output end of control circuit board and the electrodynamic pump and vibrating motor is conductively connected.
2. U-shaped intelligent electric toothbrush according to claim 1, it is characterised in that: the upper surface of described facing brush be equipped with it is upper The compatible upper occlusal crib of tooth is arranged, lower occlusal crib compatible with lower row's tooth, and upper occlusion are equipped with below facing brush The both sides of slot and lower occlusal crib are equipped with multiple rows of for cleaning the bristle of tooth;It is all provided in the upper occlusal crib and in lower occlusal crib There is the catheter, and two catheters are equipped with multiple drainage holes.
3. U-shaped intelligent electric toothbrush according to claim 2, it is characterised in that: in the upper occlusal crib and lower occlusal crib Connection is connected in interior catheter, and the bottom end of the facing brush is equipped with to the catheter feed flow of upper occlusal crib and lower occlusal crib Inlet opening, and magnet is equipped at the inlet opening.
4. U-shaped intelligent electric toothbrush according to claim 3, it is characterised in that: the fluid hole of the liquid guiding cavity is located at institute The top of driver is stated, magnet, and the magnet phase at the magnet and fluid hole at the inlet opening are equipped at the fluid hole It inhales, and then connects facing brush with driver.
5. U-shaped intelligent electric toothbrush according to claim 1, it is characterised in that: the bottom wall of the paste storage bottle and institute The roof for stating equipment receiving bottle is adapted, and the roof of the bottom wall of paste storage bottle and equipment receiving bottle is connected by a snap, And then so that paste storage bottle is accommodated bottle with equipment and connect to form spherical driver.
6. U-shaped intelligent electric toothbrush according to claim 1, it is characterised in that: the paste storage bottle is equipped with liquid filling hole, And liquid filling hole is equipped with corresponding stopple.
7. U-shaped intelligent electric toothbrush according to claim 1, it is characterised in that: the pipette is hose, and imbibition The imbibition end of pipe is equipped with weight.
8. U-shaped intelligent electric toothbrush according to claim 1, it is characterised in that: the pipette passes through the first sealing-plug It is connected with outside the bottle of the paste storage bottle, the inlet tube is accommodated by the second sealing-plug and the equipment and is connected outside the bottle of bottle Connection, and paste storage bottle and equipment accommodate and are connected first sealing-plug and the second sealing-plug after bottle connect to connect.
9. U-shaped intelligent electric toothbrush according to claim 1, it is characterised in that: be additionally provided in the driver for The wireless charging receiving coil of the power source charges, the wireless charging receiving coil and the input terminal of the control circuit board are led Electrical connection.
10. U-shaped intelligent electric toothbrush according to claim 1, it is characterised in that: the bottom that the equipment accommodates bottle is equipped with Switch button, and the switch button is conductively connected between the control circuit board and power supply.
CN201721340882.1U 2017-10-16 2017-10-16 U-shaped intelligent electric toothbrush Expired - Fee Related CN208492356U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721340882.1U CN208492356U (en) 2017-10-16 2017-10-16 U-shaped intelligent electric toothbrush

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721340882.1U CN208492356U (en) 2017-10-16 2017-10-16 U-shaped intelligent electric toothbrush

Publications (1)

Publication Number Publication Date
CN208492356U true CN208492356U (en) 2019-02-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721340882.1U Expired - Fee Related CN208492356U (en) 2017-10-16 2017-10-16 U-shaped intelligent electric toothbrush

Country Status (1)

Country Link
CN (1) CN208492356U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111265323A (en) * 2020-04-03 2020-06-12 河南科技大学 Intelligence robot of brushing teeth based on papanicolaou method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111265323A (en) * 2020-04-03 2020-06-12 河南科技大学 Intelligence robot of brushing teeth based on papanicolaou method

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20190215

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CF01 Termination of patent right due to non-payment of annual fee