CN206248838U - For the safe detection system of environmental magnetic field of MR imaging apparatus - Google Patents
For the safe detection system of environmental magnetic field of MR imaging apparatus Download PDFInfo
- Publication number
- CN206248838U CN206248838U CN201621323774.9U CN201621323774U CN206248838U CN 206248838 U CN206248838 U CN 206248838U CN 201621323774 U CN201621323774 U CN 201621323774U CN 206248838 U CN206248838 U CN 206248838U
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- detection system
- magnetic
- safe detection
- environmental
- 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.)
- Active
Links
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The utility model provides a kind of safe detection system of environmental magnetic field for MR imaging apparatus, and the MR imaging apparatus are arranged in magnetic resonance imaging room, and the safe detection system of environmental magnetic field includes：Probe unit, it includes the multiple Magnetic Sensors being arranged in around the magnetic resonance imaging room, for detecting due to the magnetic field ANOMALOUS VARIATIONS that ferromagnetic object is caused near the magnetic resonance imaging room；Data acquisition memory cell, it is connected with the probe unit, for gathering and stores the sensing data of the multiple Magnetic Sensor；Alarm unit；Control unit, when magnetic field ANOMALOUS VARIATIONS is occurred in that around the probe unit detects the magnetic resonance imaging room, described control unit controls the data acquisition memory cell collection and storage sensing data now, and controls the alarm unit to send alarm.
Description
Technical field
The utility model is related to Medical Imaging, more particularly to a kind of environmental magnetic field peace for MR imaging apparatus
Full detection system.
Background technology
It is well known that person under inspection receives that various metal ornaments can not be carried when magnetic resonance imaging (MRI) is scanned, otherwise magnetic is total to
The image that shakes can be deteriorated, and can not especially carry heart heartstart, metal implant etc., can otherwise cause safety problem.
Many people (including medical personnel and security personnel) are ignorant to be, some common ferromagnetic objects in hospital also will
Away from the magnet of magnetic resonance equipment.Although nurse doctor reminds repeatedly, caution board is also posted on doorway, and some hospitals further provided with peace
Inspection search coil, detector gate, whole body double check is carried out to the patient to be scanned, but, on the one hand in news also
Can be the report seen and there is removable sick bed, wheelchair, dust catcher, oxygen cylinder, iron rod to be sucked into MRI magnets, engineering in fact
It is recurrent that mobile phone, coin in instrument, patient's pocket of teacher etc. are sucked into magnet, is not reported only；
On the other hand, the people of many hospitals do not know, in addition to the small ferromagnetic object such as hair fastener and intrauterine contraceptive loop, in the certain limit of magnet
It is inside to be not allow for what big ferromagnetic object (such as automobile, elevator, air-conditioner outdoor unit etc.) occurred, otherwise, MRI image can occur
Deformation or Quality Down.
To the first situation, can appreciate that the people that ferromagnetic material is endangered magnet is few after all, because magnetic field is invisible
, it only has an effect the material with ferromagnetic property, and problem is that its strength is difficult to experience for ordinary people；Generally there is iron
The reason for magnet suction magnet event is that carrier ignores or do not know the presence of magnetic field force amount；Current method is only limitted to respectively
Plant safety education, it is difficult to ensure the safety of equipment.
For second situation, due to that can not possibly set up enclosure wall outside magnet room, the caution board of many hospitals also is difficult to play
Effect, the security personnel even engineer of hospital also is difficult to find or recognize the safety problem that ferromagnetic object may bring close to magnet
And its influence to MRI image quality.The engineer for being more for example responsible for plant maintenance, can basis when second situation occurs
New environment carries out shimming to magnet, and its defect is such as oversize vehicle of magnet chamber outer space ground once environment becomes again
Drive away, so also need to shimming again, this can undoubtedly increase the equipment maintenance cost of hospital.
Utility model content
In view of this, it is necessary to for MR imaging apparatus provide a kind of security protection system, it is to avoid the occurrence of above-mentioned.
Quasistatic magnetic sensor technologies can be used to prevent the generation of above-mentioned two situations, it is possible to use quasistatic magnetic is sensed
Device perceives and finds environment in time in shield door and magnet chamber the periphery passageway of Magnetic Resonance (MR) Room/ MRI Room, vacant lot arrangement Magnetic Sensor network
The ANOMALOUS VARIATIONS in magnetic field, alerts so as to avoid the generation of above-mentioned two situations.
Quasistatic Magnetic Sensor can be using the economic amorphous wire Magnetic Sensor with wireless transmission function or sensitivity
Other Magnetic Sensors higher, such as giant magneto-resistance sensor etc., network facet can utilize existing wireless network card, Internet of Things net
The ready-made technologies such as pass, the security information system with hospital combines together.
The utility model provides a kind of safe detection system of environmental magnetic field for MR imaging apparatus, the magnetic resonance
Imaging device is arranged in magnetic resonance imaging room, and the safe detection system of environmental magnetic field includes：Probe unit, it includes arrangement
Multiple Magnetic Sensors around the magnetic resonance imaging room, for detecting because ferromagnetic object is near the magnetic resonance imaging room
And the magnetic field ANOMALOUS VARIATIONS for causing；Data acquisition memory cell, it is connected with the probe unit, for gathering and stores described
The sensing data of multiple Magnetic Sensors；Alarm unit；Control unit, when the probe unit detects the magnetic resonance imaging
When magnetic field ANOMALOUS VARIATIONS is occurred in that around room, described control unit controls the data acquisition memory cell collection and storage now
Sensing data, and control the alarm unit to send alarm.
In the safe detection system of environmental magnetic field that the utility model is provided, by arranging quasistatic magnetic around magnet chamber
Sensor, once detecting anomalous field change, has determined that ferromagnetic material is close to, and alarm can be triggered therewith, reminds hospital's prison
The security personnel and medical personnel for controlling room prevent ferromagnetic material being close to MR imaging apparatus, and the system can note down abnormal magnetic
Time, the place of field change, in order to carry out safety education to person liable afterwards.
Brief description of the drawings
Fig. 1 is the schematic diagram of the safe detection system of environmental magnetic field of an implementation method of the present utility model.
Fig. 2 is the exploded view of the probe unit in the safe detection system of environmental magnetic field of the present utility model.
Fig. 3 is the circuit block diagram of the probe unit in the safe detection system of environmental magnetic field of the present utility model.
Fig. 4 is the circuit block diagram of the data acquisition memory cell in the safe detection system of environmental magnetic field of the present utility model.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real to make those skilled in the art more fully understand the technical solution of the utility model
Mode is applied to be described in detail the safe detection system of environmental magnetic field that the utility model is provided.In the drawings, for phase
Same or suitable inscape, marks identical label.It is only below the safe detection system of environmental magnetic field of the present utility model
Preferred forms, the utility model is not limited in following structures.
【The safe detection system of environmental magnetic field】
Fig. 1 is the schematic diagram of the safe detection system of environmental magnetic field of an implementation method of the present utility model.
As shown in figure 1, the MR imaging apparatus including main magnet 100 are arranged in magnetic resonance imaging room (shown in rectangle frame)
Interior, the safe detection system of environmental magnetic field includes：Probe unit, it includes being arranged in the multiple magnetic sensing around magnetic resonance imaging room
Device 200 (in figure shown in five-pointed star), for detecting because ferromagnetic object becomes extremely near the magnetic field that magnetic resonance imaging room is caused
Change；Data acquisition memory cell 300, it is connected with probe unit, for gathering and stores the sensor of multiple Magnetic Sensors 200
Data；Alarm unit (not shown)；Control unit (not shown), occurs in that when probe unit is detected around magnetic resonance imaging room
During the ANOMALOUS VARIATIONS of magnetic field, control unit control data collection memory cell 300 is gathered and stores sensing data now, and is controlled
Alarm unit processed sends alarm.
Additionally, as shown in fig. 1, Magnetic Sensor 200 be arranged within 6 meters of magnet chamber external distance magnet vacant lot (or upstairs,
Downstairs room) and 10 meters of remote vacant lots of magnet chamber external distance magnet (or upstairs, downstairs).For example, probe unit is deposited with data acquisition
Can be wireless connection, or wired connection between storage unit 300.
Generally, the manufacturer of magnetic resonance equipment can provide the drawing of its MRI main magnets magnetic field influence area to hospital, right
The classification of regional can be divided according to the magnetic field size of main magnet influence area.Such as 5 gaussian line distribution map therein is
It is required that what the patient for carrying heart heartstart must not enter；If simultaneously for there is ferromagnetic material in each region (such as second
Situation) can have a negative impact to magnetic field also has detailed regulation and explanation, and these influences cause image quality decrease to I haven't seen you for ages.
In the safe detection system of environmental magnetic field of the present utility model, according to the explanation of each producer, with reference to the tool of hospital
Body situation, sets unattended enclosure wall around magnet chamber, prevents unexpected ferromagnetic material to be close to magnet, so as to ensure
The safety and picture quality of magnet.Once it was found that magnetic field exception, sensor will be by the guarantor of wired or wireless signal notice hospital
Peace and medical personnel take action, and then prevent harmful ferromagnetic object being close to magnet.
For example, sensor can use following scheme arrangement, the install sensor at the necessary channel towards magnet chamber；
In the building outer space ground install sensor near magnet chamber；Installation upstairs or the installation downstairs of magnet chamber sensing in magnet chamber
Device, forms three-dimensional without enclosure wall protective barrier.These sensors can be connected to each other by wireless network, and hospital security pipe
Reason system globe area is integrated.
Therefore, the safe detection system of environmental magnetic field of the present utility model also includes hospital's security system interface, environmental magnetic field
Safe detection system is connected via hospital's security system interface with Hospital safety management control system 400.When probe unit detection
When occurring in that magnetic field ANOMALOUS VARIATIONS around to magnetic resonance imaging room, control unit can be cured by hospital's security system interface notification
Institute safety management control system 400.
For example, control unit can control the display of Hospital safety management control system 400 to show that storage is deposited in data
Sensing data in storage unit 300.
Below, single is stored to the probe unit 200, data acquisition in the safe detection system of environmental magnetic field of the present utility model
Unit 300 is described in detail.
【Probe unit】
As described above, the probe unit 200 in the safe detection system of environmental magnetic field of the present utility model can be using accurate quiet
State Magnetic Sensor.Probe unit 200 is described in detail by taking amorphous wire Magnetic Sensor as an example below.
Fig. 2 is the exploded view of the probe unit 200 in the safe detection system of environmental magnetic field of the present utility model.
Reference picture 2, the outer shape of probe unit is in " drawing pin " shape.Probe unit internal structure includes pad 2, collision mat
Circle 3, light-passing board 4, solar panel 6, chassis 7, water proof ring 8, waterproof enclosure box 9, battery 10, magnetic switch 11, battery case
Lid 12, iron gasket 13 and magnet 14.
Pad 2, waterproof washer 3, light-passing board 4, solar panel 6 are fixed on chassis 7 by sunk screw 1 and 5.
When probe unit is disposed in subsurface, chassis 7 flushes with or slightly higher than ground with ground.Light-passing board can be by having
The materials such as machine glass are made, and can bear certain pressure.The presence of waterproof washer 3 allows that probe unit tackles sleet sky
Gas.
Protection pad 2 and metal coating chassis 7 that aluminium alloy or stainless steel are constituted can prevent from pin from stepping on being rolled with vehicle.Too
It is positive can cell panel 6 can be charged for battery 10, thus probe unit of the present utility model can work long hours and without independent
Power supply.
Magnetic switch 11 is arranged on the bottom of packaging cartridge 9 as power switch, is connected with power-supply controller of electric, when packaging cartridge bottom
When there is magnet in portion, tongue tube is in open state long, and after magnet is removed, tongue tube is in closed state long.
Fig. 3 is the circuit block diagram of probe unit of the present utility model.As shown in figure 3, being installed in packaging cartridge 9 (shown in dotted line)
There are power distribution controller 51, rechargeable battery 52, sensor circuit board 53, intelligence interface process plate 54 and ceramic antenna 55.
Power distribution controller 51 is used for the electric power distribution for being converted to solar panel 33 to battery 10.Sensor
Circuit board 53 includes the micro- magnetic probe 532 of oscillator 531, amorphous wire and amplifier 533.Intelligence interface process plate 54 turns including A/D
Parallel operation 541, single-chip microcomputer 542 and RFID 543.Ceramic antenna 55 and RFID 543 are close to below the chassis 7 of Fig. 2, battery envelope
The top of mounted box 9.
There is a dynamic threshold voltage in the program of single-chip microcomputer 542 of Intelligent treatment interface board 54, when environmental magnetic field occurs slowly
During change, single-chip microcomputer 542 can calculate dynamic threshold voltage corresponding with background magnetic field, for filtering the micro- magnetic probe of amorphous wire
Harmful effect or wrong report of 532 surrounding environment to sensor.
The parameter of the micro- magnetic probe 532 of amorphous wire is preferably as follows：
Operating voltage DC 9V ± 1V；Vehicle speed measurement scope：5~300Km/h；Detection radius：0~2M；Single probe work(
Consumption：≤ 120 milliwatts；Operating temperature：- 25~85 DEG C；Degree of protection：Higher than IP67；Body contours：Signal acquisition part Φ 90 ×
112 millimeters.
Whether there is ferromagnetic object in addition to except that can detect, the micro- magnetic probe 532 of amorphous wire can also perceive ferromagnetic
The translational speed of object, principle is explained as follows.
If setting up two micro- magnetic probes of amorphous wire, and two micro- magnetic spies of amorphous wire in the side of disturbance object of which movement
The distance of head is S, then have following relation：
V=S/t
Wherein, the time that t is spent by ferromagnetic object by two sensors.
In the case of known to S, can be to obtain the speed V that object is moved as long as measuring t.And then, can be according to this
Individual speed V, judges roughly the property of the ferromagnetic object.
In the utility model, the micro- magnetic probe 532 of amorphous wire uses Co-Fe-M-Si-B amorphous wire materials, its response speed
Less than 10 nanoseconds, (5 millimeters long, and 30 microns -100 microns thick, resistance to for sensitivity (Full-span output 1000mV or so) high, small volume
Burn into strong shock resistance.
In a word, the advantage of the micro- magnetic probe 532 of amorphous wire is a lot, including but not limited to：Small volume, simple installation, economy are resistance to
With；Can detect various ferromagnetic objects (sick bed, dust catcher, large, medium and small vehicle, electric vehicle and bicycle etc.)；Rate accuracy is high (multistage
It is adjustable), without fail to report wrong report etc.；Performance is outstanding in the presence of a harsh environment, can all weather operations；Can detect ferromagnetic object appearance,
Translational speed and quantity.
Referring again to Fig. 3, the change in its disturbance earth's magnetic field when the micro- detection of magnetic probe 532 ferromagnetic object of amorphous wire passes through.Shake
Device 531 is swung for encouraging amorphous wire, accelerates its response speed.Amplifier 533 is used to amplify the signal of the micro- magnetic probe 532 of amorphous wire
And send into A/D converter 541 and be changed into data signal into single-chip microcomputer 542.At 542 pairs of sensing datas of collection of single-chip microcomputer
Reason, by RFID 543 and ceramic antenna 55, sensing data is sent to data acquisition memory cell by single-chip microcomputer 542.
【Data acquisition memory cell】
Fig. 4 is the circuit block diagram of the data acquisition memory cell in the safe detection system of environmental magnetic field of the present utility model.
Reference picture 4, data acquisition memory cell 300 includes solar panel 49, electric power source distribution device 50, rechargeable battery
41st, antenna 42, packaging cartridge 43, wireless communication module 44, antenna 45.
Packaging cartridge 43 includes RFID 131, single-chip microcomputer 132, relay-operated controller interface 133, RS232 interfaces 134, USB
The interface 136 of interface 135 and 485.
Power distribution controller 10 is used for the electric power distribution for being converted to solar panel 49 to battery 41.
Antenna 12 receives the sensing data that the single-chip microcomputer 542 of the micro- magnetic probe 532 of amorphous wire sends.
Preferably, the setting height(from bottom) of packaging cartridge 43 is away from ground 5-10 meters, installed in the oblique dypass of road where probe unit
On other column or metope.The direction of the position of antenna 42 and probe unit and its road ahead composition is into 45 degree of angles.Compared to spy
The solar panel 6 of unit is surveyed, the solar panel 49 of data acquisition memory cell is much greater.
In addition, at the beginning of the single-chip microcomputer 132 in data acquisition memory cell can be input into setting system by wireless communication module 44
Beginning supplemental characteristic, it is also possible to wireless network of the data message to hospital is sent by antenna 45, into hospital's security management system
400。
Presence comprising ferromagnetic object and velocity information in transmitted data, therefore, in hospital's security management system
Can be displayed whether on display ferromagnetic object near and its translational speed information, staff can be sentenced accordingly
It is disconnected, determine the measure of next step.
Preferably, probe unit and data acquisition memory cell are powered with impulse form.With reduce single-chip microcomputer 542 and 132,
The power consumption of analog converting circuit 541 and wireless transmission and receiving circuit, because analog converting circuit 541 receives electricity with wireless transmission
The working time on road is less than the 1/5 of the whole working time, so turning off this part using power-supply controller of electric when the free time
Power supply can substantially reduce the power consumption of whole system.
In the safe detection system of environmental magnetic field that the utility model is provided, by arranging quasistatic magnetic around magnet chamber
Sensor, once detecting anomalous field change, has determined that ferromagnetic material is close to, and alarm can be triggered therewith, reminds hospital's prison
The security personnel and medical personnel for controlling room prevent ferromagnetic material being close to MR imaging apparatus.
As a result of with wireless transmission function and the micro- magnetic probe of economy amorphous wire high, can be conveniently and efficiently
While detecting ferromagnetic object, the protection to magnet chamber is realized at lower cost, without increasing more manpower and setting up
Many hardware facilities.
Embodiment of above is merely to illustrate that principle of the present utility model and the illustrative embodiments that use, but
The utility model is not limited thereto.For those skilled in the art, essence of the present utility model is not being departed from
In the case of god and essence, various changes and modifications can be made therein.These variations and modifications are also considered as protection of the present utility model
Scope.
Claims (10)
1. a kind of safe detection system of environmental magnetic field for MR imaging apparatus, the MR imaging apparatus are arranged in magnetic
In resonance image-forming room, it is characterised in that the safe detection system of environmental magnetic field includes：
Probe unit, it includes the multiple Magnetic Sensors being arranged in around the magnetic resonance imaging room, for detecting due to ferromagnetic
The magnetic field ANOMALOUS VARIATIONS that object is caused near the magnetic resonance imaging room；
Data acquisition memory cell, it is connected with the probe unit, for gathering and stores the biography of the multiple Magnetic Sensor
Sensor data；
Alarm unit；
Control unit, when magnetic field ANOMALOUS VARIATIONS is occurred in that around the probe unit detects the magnetic resonance imaging room, institute
State control unit and control the data acquisition memory cell collection and storage sensing data now, and control the alarm list
Unit sends alarm.
2. the safe detection system of environmental magnetic field according to claim 1, wherein, according to the master of the MR imaging apparatus
Magnets magnetic fields influence area distribution map arranges the multiple Magnetic Sensor.
3. the safe detection system of environmental magnetic field according to claim 1, wherein, the multiple Magnetic Sensor is arranged in and leads to
The subsurface of the necessary channel of the magnetic resonance imaging room, or it is disposed adjacent to the building outer space of the magnetic resonance imaging room
The subsurface on ground.
4. the safe detection system of environmental magnetic field according to Claims 2 or 3, wherein, the multiple Magnetic Sensor is accurate quiet
State Magnetic Sensor.
5. the safe detection system of environmental magnetic field according to claim 4, wherein, the quasistatic Magnetic Sensor is amorphous wire
High speed micro-magnetic sensor.
6. the safe detection system of environmental magnetic field according to claim 1, also including hospital's security system interface, the environment
The safe detection system in magnetic field is connected via hospital's security system interface with Hospital safety management control system,
Wherein, when magnetic field ANOMALOUS VARIATIONS is occurred in that around the probe unit detects the magnetic resonance imaging room, the control
Unit processed is by Hospital safety management control system described in hospital's security system interface notification.
7. the safe detection system of environmental magnetic field according to claim 6, wherein, described control unit controls hospital's peace
The sensing data of the display display storage of full management control system in the data storage cell.
8. the safe detection system of environmental magnetic field according to claim 5, wherein, the amorphous wire high speed micro-magnetic sensor bag
Include：Solar panel and the transparency protected pad above solar panel, when the amorphous wire high speed micro-magnetic sensor
When being disposed in subsurface, the transparency protected pad and the solar panel flush with or slightly higher than ground with ground.
9. the safe detection system of environmental magnetic field according to claim 8, wherein, the probe unit and the data acquisition
Memory cell is powered with impulse form.
10. the safe detection system of environmental magnetic field according to claim 7, wherein, the sensing data includes representing institute
State the appearance of ferromagnetic object and the information of speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621323774.9U CN206248838U (en) | 2016-12-05 | 2016-12-05 | For the safe detection system of environmental magnetic field of MR imaging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621323774.9U CN206248838U (en) | 2016-12-05 | 2016-12-05 | For the safe detection system of environmental magnetic field of MR imaging apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206248838U true CN206248838U (en) | 2017-06-13 |
Family
ID=59005115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621323774.9U Active CN206248838U (en) | 2016-12-05 | 2016-12-05 | For the safe detection system of environmental magnetic field of MR imaging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206248838U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023044294A1 (en) * | 2021-09-17 | 2023-03-23 | Iradimed Corporation | Ferromagnetic detector and threat analysis |
-
2016
- 2016-12-05 CN CN201621323774.9U patent/CN206248838U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023044294A1 (en) * | 2021-09-17 | 2023-03-23 | Iradimed Corporation | Ferromagnetic detector and threat analysis |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103142219B (en) | Unrestraint type vital sign monitoring mattress | |
| US6885302B2 (en) | Magnetic field sensing for tamper identification | |
| CN102982653B (en) | Human body falling monitoring method and device based on acceleration and height information | |
| US20190154863A1 (en) | Door assembly for an mri room | |
| CN206975232U (en) | A kind of detector gate with temp sensing function | |
| CN102626312B (en) | Fall detection method and device and wearable device | |
| EP2146224A2 (en) | Magnetic Body Detector | |
| CN206248838U (en) | For the safe detection system of environmental magnetic field of MR imaging apparatus | |
| CN102348015B (en) | Burglarproof alarming handset for radioactive sources | |
| CN105607141A (en) | Metal security check door with movable detection function | |
| CN206606499U (en) | The intelligent medicine box of medication information can be obtained | |
| CN108759957A (en) | A kind of combustible gas metering arrangement based on no magnetic technology | |
| CN205541310U (en) | Portable radiation sound and light warning device | |
| CN109186444A (en) | A kind of detection device and detection method of weighing scale platform limit distance | |
| CN108133558A (en) | Low-power consumption displacement detection alarming device | |
| CN209015417U (en) | Road monitoring apparatus based on Internet of Things | |
| CN206002949U (en) | A kind of intelligent plant work attendance automatic control system | |
| CN203193795U (en) | Monitoring circuit based on vibration sensor | |
| CN204856659U (en) | Flow of personnel volume measuring device | |
| CN211719186U (en) | Infrared temperature measurement elevator advertisement display | |
| CN201096891Y (en) | Gamma radioactivity safety detection device | |
| CN106200595A (en) | A kind of novel plant work attendance energy-saving control system | |
| CN207627869U (en) | A kind of physical examinations system | |
| CN208769765U (en) | A kind of juvenile's volume temperature morning checking device | |
| CN112764079A (en) | Personal dose detection device for radioactive source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |