CN110736251A - operating room differential pressure automatic regulating system and method - Google Patents
operating room differential pressure automatic regulating system and method Download PDFInfo
- Publication number
- CN110736251A CN110736251A CN201911001311.9A CN201911001311A CN110736251A CN 110736251 A CN110736251 A CN 110736251A CN 201911001311 A CN201911001311 A CN 201911001311A CN 110736251 A CN110736251 A CN 110736251A
- Authority
- CN
- China
- Prior art keywords
- air
- operating room
- differential pressure
- pressure difference
- pressure
- 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.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Fluid Mechanics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses operating room pressure difference automatic regulating systems and methods, micro-pressure differential pressure sensors are connected inside and outside an operating room, the micro-pressure differential pressure sensors monitor the pressure difference inside and outside the operating room in real time, a remote control device analyzes and compares the pressure difference inside and outside the operating room with a set threshold value, if the pressure difference value is not within the range of the set threshold value, a regulating signal is sent to a purifying air conditioner automatic control cabinet remotely, the purifying air conditioner automatic control cabinet respectively controls the analog quantity electric regulating air valves on an air supply outlet and an air return outlet of a purifying air conditioner unit to work according to the control signal, the operating room pressure difference automatic control is realized, the system structure is simple, the air supply and air intake are monitored and automatically regulated in real time through the system, the stability of the operating room pressure difference is ensured, the control logic is simple, the reliability is high, and the system is suitable for.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to an operating room differential pressure automatic regulating system and a method.
Background
, the operation of the operating room is to reduce the interference and influence of clean corridors and clean corridors on the internal space of the operating room, and the pressure difference control is the most important and effective means for maintaining the cleanliness level of the operating room, reducing external pollution and preventing cross contamination.
(1) When the operating room is closed , the pollution of the surrounding environment is prevented from permeating into the clean room through the window gap.
(2) When the operating room is opened , sufficient air flow velocity is ensured, air flow into the operating room at the moment of opening and personnel entry is minimized, and the direction of the air flow is ensured so as to minimize the entering pollution.
When a patient with a virulent infectious disease is performing an operation in the negative pressure operating room, the pressure difference in the operating room needs to be kept relatively negative.
With the continuous development of operating rooms, the requirement on the cleaning technology of the operating rooms is continuously improved, the cleaning technology is to take the internal environment of the clean operating rooms as a controllable environment, important indexes of the cleaning level are the quantity of dust particles in the air, the control of the dust particles in the air is to be realized, important factors are the control of pressure difference of different cleaning levels, the pressure difference can only be displayed in the cleaning engineering at present and cannot be automatically controlled, if the pressure difference is in a problem, the cleanliness of the operating rooms is in a problem, bacteria in the operating rooms can exceed the standard, the infection rate of operations can be increased, -like the phenomenon that the pressure difference in the operating rooms is out of control, personnel in the operating rooms can not be adjusted, the operating rooms can only be stopped to be comprehensively debugged on site by means of professional technical engineers, the use efficiency of the operating rooms can be reduced, the operating cost of the operating rooms can be increased, and the infection.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide stable and reliable automatic operating room pressure difference adjusting systems and methods, and realize automatic control of operating room pressure difference.
In order to achieve the purpose, the invention adopts the technical scheme that:
automatic regulating system for operating room pressure difference comprises a micro-pressure differential pressure sensor, a remote control device and analog quantity electric regulating air valves respectively arranged on an air supply outlet and an air return inlet of a purifying air conditioning unit;
the micro-pressure differential pressure sensor is used for respectively measuring the pressure difference inside and outside the operating room, and transmitting a pressure difference signal to the remote control device for analysis and calculation, the remote control device remotely transmits an adjusting signal to the automatic purifying air conditioner control cabinet according to the comparison condition of the indoor and external pressure differences measured by the micro-pressure differential pressure sensor and a set threshold value, and the automatic purifying air conditioner control cabinet respectively controls the analog quantity electric adjusting air valves on the air supply outlet and the air return inlet of the purifying air conditioner unit to work according to the control signal, so that the purpose of automatically controlling the pressure difference of the operating room is realized.
And , the micro differential pressure sensor is a piezoresistive pressure sensor chip.
, it also includes operating room information panel for displaying the measured differential pressure value of the micro differential pressure sensor.
method for automatically regulating the differential pressure in operating room, comprising the following steps:
(1) the micro-pressure differential pressure sensor respectively measures the pressure difference inside and outside the operating room and sends a differential pressure signal to the remote control device for analysis and calculation;
(2) the remote control device compares the indoor and outdoor differential pressure value measured actually with a set threshold value, and if the actual differential pressure value is lower than the set threshold value, the remote control device sends a control signal to the automatic control cabinet of the air conditioner, adjusts the electric adjusting air valves on the air inlet and the air return inlet, and the control cabinet controls the increase of variable-frequency air supply quantity, increases the fresh air quantity and reduces the air return quantity; if the actual differential pressure value is higher than the set threshold value, the remote control device sends a control signal to the automatic control cabinet of the air conditioner, and the automatic control cabinet receives the signal and then controls the air supply quantity and the fresh air quantity to be reduced and the return air quantity to be increased until the indoor and outdoor differential pressure value obtained by the remote control device is within the range of the set threshold value.
And step , adjusting the electric adjusting air valves on the air supply outlet and the air return inlet according to the relation between the actual differential pressure value and the leakage air quantity as follows:
in the formula, △ L-leakage air volume, m3Per hour, S is the leakage area, square meter, △ P is the indoor and outdoor pressure difference value, Pa.
And , adjusting the opening of an electric adjusting valve on the air supply and return pipe or/and adjusting the rotating speed of a variable frequency fan to adjust the air supply quantity, the air return quantity and the fresh air quantity, and further adjusting the pressure difference of the operating room.
The invention connects micro-pressure differential pressure sensors inside and outside the operating room, monitors the pressure difference inside and outside the operating room in real time through the micro-pressure differential pressure sensors, analyzes and compares the pressure difference inside and outside the operating room with a set threshold through a remote control device, remotely sends an adjusting signal to the automatic control cabinet of the purifying air conditioner if the pressure difference is not within the range of the set threshold, and the automatic control cabinet of the purifying air conditioner respectively controls the analog quantity electric adjusting air valves on the air supply outlet and the air return outlet of the purifying air conditioner unit to work according to the control signal, thereby realizing the automatic control of the pressure difference in the operating room.
The control method is simple, the decompression is monitored through the micro-pressure differential pressure sensor, and finally the work of the electric adjusting air valves on the air supply outlet and the air return inlet is controlled through the automatic control cabinet of the air conditioner, so that the control logic is simple, the reliability is high, the practicability is high, and the method is suitable for being used by pushing in large quantities.
The pressure difference control is realized by giving a control signal by the automatic control cabinet of the air conditioner, real-time remote control is realized by the electric regulating valve, manual regulation is not needed, and the control is accurate and convenient. The operating room pressure difference is not only adjusted through the aperture of the electric adjusting valve on the air supply and return pipe, but also can be adjusted through adjusting the rotating speed of the variable frequency fan to adjust the air supply quantity, the return air quantity and the fresh air quantity, so that the pressure difference can be quickly adjusted, and the continuous stability of the operating room pressure difference is ensured.
The fans matched with the indoor unit of the air-conditioning purification unit all adopt variable frequency fans, and the adjustment of the rotating speed of the fans is realized through a frequency converter, so that the change of the air quantity is realized, an electric adjusting valve is also installed on an exhaust pipeline, and under an emergency state, the stability of pressure difference can be realized by controlling the exhaust air quantity, and the air-conditioning purification unit is safe and reliable.
Drawings
FIG. 1 is a flow chart of an automatic differential pressure adjustment method of the present invention;
fig. 2 is a control schematic of the present invention.
Detailed Description
The invention is described in further detail in with reference to specific examples, which are not intended to be limiting.
The automatic operating room pressure difference regulating system has micro pressure difference sensors connected to the inside and outside of the operating room, the outside being clean corridor or dirt corridor, analog electric regulating air valves installed to the air outlet and air return port of the air conditioner, and high performance silicon chip package for high static pressure resistance, high interference resistance, stability and reliability.
The micro-pressure differential pressure sensor is used for measuring the pressure difference inside and outside the operating room respectively, the micro-pressure differential pressure sensor can display the pressure difference value on a liquid crystal information panel of the operating room through analog quantity signals, and the information panel can display and set the required pressure difference value.
The remote control device remotely sends an adjusting signal to the automatic purifying air-conditioning control cabinet according to the comparison condition of the indoor and outdoor pressure differences measured by the micro-pressure differential pressure sensor and the set threshold value, and the automatic purifying air-conditioning control cabinet respectively controls the analog quantity electric adjusting air valves on the air supply outlet and the air return inlet of the purifying air-conditioning unit to work according to the control signal, so that the purpose of automatically controlling the pressure difference of the operating room is realized, and the effect of adjusting the indoor and outdoor pressure differences to accord with the set threshold value is achieved.
As shown in fig. 1 and 2, the differential pressure adjusting method of the present invention comprises:
respectively measuring the pressure difference inside and outside the operating room through a micro-pressure differential pressure sensor, and sending a differential pressure signal to a remote control device for analysis and calculation;
if the actual differential pressure value is lower than the set differential pressure value, the micro differential pressure sensor can provide electric signals for electric adjusting air valves on air supply and return ports of the automatic control cabinet of the air conditioner, so as to increase the air supply quantity and reduce the air return quantity, and meanwhile, the automatic control cabinet also provides control signals for a variable frequency air feeder and a variable frequency new air blower, so as to control the variable frequency new air blower to increase the air supply quantity and the new air quantity;
similarly, if the actual differential pressure value is higher than the set value, the automatic control cabinet can control and reduce the air supply quantity and the fresh air quantity and increase the return air quantity after receiving the signal, and the purpose of automatically controlling the differential pressure of the operating room can be realized through the precise matching of the pressure sensor, the air supply and return air electric adjusting air valve and the air conditioner automatic control cabinet.
The calculation relationship between the actual differential pressure value, the wind speed and the wind volume is as follows:
1. applying the bernoulli equation:
the pressure difference between the inside and the outside of the clean room is △ P1/2X 1.29V2
△ P in the formula is indoor and outdoor differential pressure value, Pa;
1.29-air Density, Kg/m3；
V is leakage wind speed, m/s.
2. From bernoulli's equation:
because △ L is S × V,
then:
formula III △ L-air leakage quantity, m3/h；
S-area of leakage, square meter.
And electric adjusting air valves on the air supply outlet and the air return inlet are adjusted according to the relation between the actual differential pressure value and the leakage air quantity, so that the differential pressure of the operating room is quickly adjusted, and the operation is quicker and more accurate.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (6)
- The operating room pressure difference automatic regulating system is characterized by comprising a micro pressure difference pressure sensor, a remote control device and analog quantity electric regulating air valves which are respectively arranged on an air supply outlet and an air return inlet of a purifying air conditioning unit;the micro-pressure differential pressure sensor is used for respectively measuring the pressure difference inside and outside the operating room, and transmitting a pressure difference signal to the remote control device for analysis and calculation, the remote control device remotely transmits an adjusting signal to the automatic purifying air conditioner control cabinet according to the comparison condition of the indoor and external pressure differences measured by the micro-pressure differential pressure sensor and a set threshold value, and the automatic purifying air conditioner control cabinet respectively controls the analog quantity electric adjusting air valves on the air supply outlet and the air return inlet of the purifying air conditioner unit to work according to the control signal, so that the purpose of automatically controlling the pressure difference of the operating room is realized.
- 2. An operating room pressure differential automatic adjustment system according to claim 1, characterized in that: the micro differential pressure sensor adopts a piezoresistive pressure sensor chip.
- 3. An operating room pressure differential automatic adjustment system according to claim 1, characterized in that: the operating room information panel is used for displaying the differential pressure value measured by the micro differential pressure sensor.
- 4, method for automatically adjusting differential pressure in operating room based on the system of claim 1, comprising the steps of:(1) the micro-pressure differential pressure sensor respectively measures the pressure difference inside and outside the operating room and sends a differential pressure signal to the remote control device for analysis and calculation;(2) the remote control device compares the indoor and outdoor differential pressure value measured actually with a set threshold value, and if the actual differential pressure value is lower than the set threshold value, the remote control device sends a control signal to the automatic control cabinet of the air conditioner, adjusts the electric adjusting air valves on the air inlet and the air return inlet, and the control cabinet controls the increase of variable-frequency air supply quantity, increases the fresh air quantity and reduces the air return quantity; if the actual differential pressure value is higher than the set threshold value, the remote control device sends a control signal to the automatic control cabinet of the air conditioner, and the automatic control cabinet receives the signal and then controls the air supply quantity and the fresh air quantity to be reduced and the return air quantity to be increased until the indoor and outdoor differential pressure value obtained by the remote control device is within the range of the set threshold value.
- 5. The automatic operating room pressure difference adjustment method according to claim 4, wherein: the relation between the actual differential pressure value and the leakage air quantity is as follows, and the electric adjusting air valves on the air supply outlet and the air return inlet are adjusted according to the relation between the actual differential pressure value and the leakage air quantity:
in the formula, △ L-leakage air volume, m3Per hour, S is the leakage area, square meter, △ P is the indoor and outdoor pressure difference value, Pa. - 6. The automatic operating room pressure difference adjustment method according to claim 4, wherein: the air supply quantity, the return air quantity and the fresh air quantity are adjusted by adjusting the opening of an electric adjusting valve on the air supply and return pipe or/and adjusting the rotating speed of the variable frequency fan, so that the differential pressure of the operating room is adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911001311.9A CN110736251A (en) | 2019-10-21 | 2019-10-21 | operating room differential pressure automatic regulating system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911001311.9A CN110736251A (en) | 2019-10-21 | 2019-10-21 | operating room differential pressure automatic regulating system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110736251A true CN110736251A (en) | 2020-01-31 |
Family
ID=69270674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911001311.9A Withdrawn CN110736251A (en) | 2019-10-21 | 2019-10-21 | operating room differential pressure automatic regulating system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110736251A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111694307A (en) * | 2020-06-17 | 2020-09-22 | 扬州大学 | Intelligent monitoring system of negative pressure transfer bin and control method thereof |
| CN112611092A (en) * | 2021-01-20 | 2021-04-06 | 广东恩胜科技有限公司 | Indoor air circulation allocation method, system, equipment and storage medium |
| CN112651196A (en) * | 2020-12-30 | 2021-04-13 | 苏州水木科能科技有限公司 | Pressure calculation method |
| CN114484815A (en) * | 2021-12-20 | 2022-05-13 | 彩虹显示器件股份有限公司 | System and method for controlling environment between TFT-LCD photoelectric glass forming |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007046850A (en) * | 2005-08-11 | 2007-02-22 | Shinryo Corp | Room pressure control system targeting two or more rooms |
| CN202166156U (en) * | 2010-12-24 | 2012-03-14 | 天津市龙川净化工程有限公司 | Cleaning air conditioner control system for clean operating room |
| CN102538129A (en) * | 2010-12-24 | 2012-07-04 | 天津市龙川净化工程有限公司 | Clean purification air-conditioning control method for operating room and application system thereof |
| CN105180356A (en) * | 2015-08-28 | 2015-12-23 | 深圳市尚荣医疗股份有限公司 | Fresh air volume and air quality management system for operation room, and adjustment method thereof |
| CN109724223A (en) * | 2019-03-04 | 2019-05-07 | 苏州沈氏净化设备有限公司 | A kind of air quality monitoring system and method |
-
2019
- 2019-10-21 CN CN201911001311.9A patent/CN110736251A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007046850A (en) * | 2005-08-11 | 2007-02-22 | Shinryo Corp | Room pressure control system targeting two or more rooms |
| CN202166156U (en) * | 2010-12-24 | 2012-03-14 | 天津市龙川净化工程有限公司 | Cleaning air conditioner control system for clean operating room |
| CN102538129A (en) * | 2010-12-24 | 2012-07-04 | 天津市龙川净化工程有限公司 | Clean purification air-conditioning control method for operating room and application system thereof |
| CN105180356A (en) * | 2015-08-28 | 2015-12-23 | 深圳市尚荣医疗股份有限公司 | Fresh air volume and air quality management system for operation room, and adjustment method thereof |
| CN109724223A (en) * | 2019-03-04 | 2019-05-07 | 苏州沈氏净化设备有限公司 | A kind of air quality monitoring system and method |
Non-Patent Citations (1)
| Title |
|---|
| 刘俊杰、赵歆治、王斌: "生物洁净室的负压控制", 《暖通空调HV&AC》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111694307A (en) * | 2020-06-17 | 2020-09-22 | 扬州大学 | Intelligent monitoring system of negative pressure transfer bin and control method thereof |
| CN112651196A (en) * | 2020-12-30 | 2021-04-13 | 苏州水木科能科技有限公司 | Pressure calculation method |
| CN112611092A (en) * | 2021-01-20 | 2021-04-06 | 广东恩胜科技有限公司 | Indoor air circulation allocation method, system, equipment and storage medium |
| CN114484815A (en) * | 2021-12-20 | 2022-05-13 | 彩虹显示器件股份有限公司 | System and method for controlling environment between TFT-LCD photoelectric glass forming |
| CN114484815B (en) * | 2021-12-20 | 2023-12-26 | 彩虹显示器件股份有限公司 | TFT-LCD photoelectric glass forming room environment control system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110736251A (en) | operating room differential pressure automatic regulating system and method | |
| CN206257781U (en) | A kind of laboratory multistage ventilated energy-saving control system | |
| CN106196505B (en) | A kind of intelligent control method of Fresh air handling units and the Fresh air handling units of application this method | |
| CN204165185U (en) | A kind of variable air volume control system of laboratory ventilation system | |
| US20130337737A1 (en) | Compressed gas cylinder cabinet with regulated exhaust control | |
| KR20200012175A (en) | Air conditioning system of negative pressure type special facility | |
| CN102716889B (en) | Control system and control method of surface air speed of fume hood | |
| CN215112904U (en) | Infectious ward area control system | |
| CN208866122U (en) | A kind of green intelligent laboratory ventilation system | |
| CN108302726A (en) | A kind of laboratory multistage ventilated energy-saving control system | |
| CN112113302A (en) | Dynamic control method and device for biological safety isolation environment | |
| CN106091158A (en) | A kind of bathroom air cleaner | |
| CN103673215A (en) | Automatic control device of building air conditioning system | |
| CN112815412A (en) | Device and method for controlling air output of clean area purification system | |
| CN209539612U (en) | Low temperature draught fan performance test system | |
| CN102101062B (en) | Aerosol microenvironment enclosed cabin for aerosol experiment | |
| CN205372937U (en) | Clean operation malleation control system of portion | |
| CN116126060A (en) | Adjusting device and adjusting method for environment of synthetic biology laboratory | |
| CN208620480U (en) | Indoor envirobnmental control system based on EM231 controller | |
| CN208025718U (en) | A kind of computer room temperature regulating system | |
| CN207455745U (en) | A kind of fresh air system for purifying PM2.5 | |
| CN205496247U (en) | Intelligent fume chamber that can remote control | |
| CN201912942U (en) | Aerosol microenvironment sealed cabin for aerosol experiment | |
| CN108036438A (en) | A kind of energy-saving fresh air system | |
| CN110206576A (en) | Regulating system, the method for a kind of underground coal mine intelligence air regulator and the intelligence air regulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200131 |