CN113567900A - Magnetic resonance superconducting magnet Internet of things system - Google Patents
Magnetic resonance superconducting magnet Internet of things system Download PDFInfo
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- CN113567900A CN113567900A CN202110854623.5A CN202110854623A CN113567900A CN 113567900 A CN113567900 A CN 113567900A CN 202110854623 A CN202110854623 A CN 202110854623A CN 113567900 A CN113567900 A CN 113567900A
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- 230000006855 networking Effects 0.000 claims abstract 2
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- 239000001307 helium Substances 0.000 claims description 10
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
- G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention relates to the technical field of magnetic resonance, in particular to a magnetic resonance superconducting magnet internet of things system. A magnetic resonance superconducting magnet thing networking system, includes superconducting magnet, its characterized in that: the signal output end of the superconducting magnet is connected with the signal input end of the superconducting magnet monitoring module, and the signal output end of the superconducting magnet monitoring module is connected with the monitoring platform through the industrial gateway; the monitoring platform is respectively connected with the hospital equipment department and the equipment manufacturer. Compared with the prior art, the magnetic resonance superconducting magnet Internet of things system is provided, the running state of a magnet is tracked, data are acquired, the running state of the magnet is uploaded to a server through a wired or wireless network and compared and analyzed, if the parameter of the magnet exceeds a threshold value, the system automatically gives an alarm, sends the alarm to relevant responsible personnel (equipment managers, operators, after-sales engineers and the like) in a short message mode and generates a work order, and assigns the engineers to maintain and track.
Description
Technical Field
The invention relates to the technical field of magnetic resonance, in particular to a magnetic resonance superconducting magnet internet of things system.
Background
The nuclear magnetic resonance imaging is a new latest medical imaging technology for imaging by using a magnetic resonance principle, and has excellent diagnostic functions on brain, thyroid, liver, gallbladder, spleen, kidney, pancreas, adrenal gland, uterus, ovary, prostate and other solid organs as well as heart and great vessels. Compared with other auxiliary examination means, nuclear magnetic resonance has the advantages of multiple imaging parameters, high scanning speed, high tissue resolution, clearer images and the like, can help doctors to 'see' early-stage lesions which are not easy to detect, and becomes a tool for early-stage screening of tumors, heart diseases and cerebrovascular diseases. Since nuclear magnetic resonance is magnetic field imaging, it is not harmful to human body and is very safe because of no radioactivity.
Magnetic resonance imaging requires the provision of a relatively high magnetic field, the higher the magnetic field the higher the image resolution ratio, the high field strength being provided primarily by the superconducting magnet. Superconducting magnet refers to an electromagnet formed as a coil at low temperature with a second type of superconductor having a high transition temperature and a particularly high critical magnetic field. The superconducting magnet has no joule heat loss when stably running, and the point is particularly outstanding for the magnet needing to obtain a direct-current strong magnetic field in a larger space, so that a large amount of energy can be saved, the required excitation power is low, and huge water supply and purification equipment like a conventional magnet is not needed. Superconducting materials can have very high current densities, so that superconducting magnets are small and lightweight, and can more easily meet special requirements regarding high homogeneity or high magnetic field gradients. And the superconducting switch is switched on, so that the superconducting magnet works in a continuous current state, and an extremely stable magnetic field can be obtained.
In order to maintain the superconducting state of the magnet, the magnet coils need to be soaked in ultralow-temperature liquid helium with the temperature of 4.2K, and each magnet contains 1000L-2000L of liquid helium. The refrigerator of the magnet low-temperature system needs 24 hours to run uninterruptedly to provide cold energy and maintain zero volatilization of liquid helium. If shutdown or abnormal magnet parameters occur, liquid helium volatilizes or the magnet is quenched, so that great loss is brought, and therefore the running state (temperature, pressure, liquid level, compressor state and the like) of the magnet needs to be monitored and collected in real time. The traditional mode is for adopting artifical point to examine the mode, looks over magnet operating condition and carries out manual record every day, and this mode is passive record mode, and is inefficient, consume the manpower, and can't discover the trouble the very first time.
Disclosure of Invention
The invention provides a magnetic resonance superconducting magnet Internet of things system for overcoming the defects of the prior art, wherein the magnetic resonance superconducting magnet Internet of things system is used for tracking the running state of a magnet and acquiring data, and uploading the data to a server through a wired or wireless network for comparative analysis.
In order to achieve the purpose, the magnetic resonance superconducting magnet internet of things system comprises a superconducting magnet and is characterized in that: the signal output end of the superconducting magnet is connected with the signal input end of the superconducting magnet monitoring module, and the signal output end of the superconducting magnet monitoring module is connected with the monitoring platform through the industrial gateway; the monitoring platform is respectively connected with the hospital equipment department and the equipment manufacturer.
The monitoring platform is connected with the mobile terminal through a wireless network.
The superconducting magnet is provided with at least 1 superconducting magnet.
The mobile terminal is one or more of a mobile phone terminal and a PC terminal.
The work of the monitoring platform comprises real-time monitoring, data acquisition, recording and parameter display on a screen.
The data collected by the monitoring platform comprise the temperature of the parts of 4K Cold, 50K Shield, 50K Unisock and 50K Bore and the liquid helium level value of the superconducting magnet.
The superconducting magnet monitoring module comprises a pressure measuring and controlling unit, an EIS heating unit, a compressor state measuring unit, an emergency quench controlling unit and a network serial port.
The pressure measuring and controlling unit measures the pressure of the superconducting magnet in real time and performs feedback control to ensure that the pressure of the superconducting magnet is stabilized at 1950-2150 Pa; the EIS heating unit heats an EIS switch heater of the superconducting magnet every day to eliminate induced current, so that the interference of an external magnetic field on a main magnetic field of the magnet is reduced; the compressor state measuring unit detects the running state of the compressor, and if the compressor is in a closed state, the indicator light and the buzzer are turned on; the emergency quench control unit is used in an emergency state, and at the moment, the switch is pressed, the magnet quenches, and the magnetic field disappears; the network serial port is a communication interface and is used for uploading the magnet monitoring data.
The specific working process is as follows:
(1) the monitoring platform acquires data through the superconducting magnet monitoring module;
(2) after data are collected, calculating an actual temperature value according to a fitting formula;
(3) when data are collected, comparing the collected data with the data collected in the previous 5 times, if the data are all in a set reasonable range, considering the data to be real and effective, and otherwise, considering the data to be invalid, and carrying out secondary collection;
(4) if the data is not in the set reasonable range, the monitoring platform can carry out warning, alarming and fault processing according to the type of the data and send the information to the hospital equipment department and equipment manufacturers;
(5) and processing according to the data exception by related personnel.
The warning is vbat; the alarms are 4K cold, 50K instant, 50K shield, 50K bore, liquid _ level1 and liquid _ level 2; the failures are prh, vin, erdu, Stress.
Compared with the prior art, the magnetic resonance superconducting magnet Internet of things system provided by the invention has the advantages that the running state of a magnet is tracked and data is acquired, the magnet is uploaded to a server through a wired or wireless network and is compared and analyzed, if the magnet parameter exceeds a threshold value, the system automatically alarms, and sends the magnet parameter to relevant responsible personnel (equipment managers, operators, after-sales engineers and the like) in a short message mode to generate a work order, and the engineers are assigned to maintain and track.
Drawings
FIG. 1 is a block diagram of a system according to the present invention.
Fig. 2 is a screenshot of an equipment profile window.
Fig. 3 is a screenshot of the real-time operating state of the superconducting magnet.
Fig. 4 is a summary screenshot of the alarm information.
FIG. 5 is a summary screenshot of work order progress.
Fig. 6 is a screenshot of an alarm message.
Referring to fig. 1, 1 is a superconducting magnet, 2 is a superconducting magnet monitoring module, 3 is an industrial gateway, 4 is a monitoring platform, 5 is a hospital equipment department, 6 is an equipment manufacturer, and 7 is a mobile terminal.
Detailed Description
The invention is further illustrated below with reference to the accompanying drawings.
As shown in fig. 1 to 6, a signal output end of a superconducting magnet 1 is connected to a signal input end of a superconducting magnet monitoring module 2, and a signal output end of the superconducting magnet monitoring module 2 is connected to a monitoring platform 4 through an industrial gateway 3; the monitoring platform 4 is respectively connected with a hospital equipment department 5 and an equipment manufacturer 6.
The monitoring platform 4 is connected with the mobile terminal 7 through a wireless network.
The superconducting magnet 1 is provided with at least 1 piece.
The mobile terminal 7 is one or more of a mobile phone and a PC terminal.
The operation of the monitoring platform 4 includes real-time monitoring, data acquisition, recording and displaying parameters on a screen.
The data collected by the monitoring platform 4 comprises 4K Cold, 50K Shield, 50K Unisock and 50K Bore part temperature and the liquid helium level value of the superconducting magnet 1.
The superconducting magnet monitoring module 2 comprises a pressure measuring and controlling unit, an EIS heating unit, a compressor state measuring unit, an emergency quench controlling unit and a network serial port.
The pressure measuring and controlling unit measures the pressure of the superconducting magnet 1 in real time and performs feedback control to ensure that the pressure of the superconducting magnet 1 is stabilized at 1950 and 2150 Pa; the EIS heating unit heats an EIS switch heater of the superconducting magnet 1 every day to eliminate induced current, so that the interference of an external magnetic field on a main magnetic field of the magnet is reduced; the compressor state measuring unit detects the running state of the compressor, and if the compressor is in a closed state, the indicator light and the buzzer are turned on; the emergency quench control unit is used in an emergency state, and the switch is pressed at the moment, so that the magnet quenches and the magnetic field disappears; the network serial port is a communication interface and is used for uploading the magnet monitoring data.
The specific working process is as follows:
(1) the monitoring platform acquires data through the superconducting magnet monitoring module;
(2) after data are collected, calculating an actual temperature value according to a fitting formula;
(3) when data are collected, comparing the collected data with the data collected in the previous 5 times, if the data are all in a set reasonable range, considering the data to be real and effective, and otherwise, considering the data to be invalid, and carrying out secondary collection;
(4) if the data is not in the set reasonable range, the monitoring platform can carry out warning, alarming and fault processing according to the type of the data and send the information to the hospital equipment department and equipment manufacturers;
(5) and processing according to the data exception by related personnel.
Warning is vbat; the alarms are 4K cold, 50K instant, 50K shield, 50K bore, liquid _ level1 and liquid _ level 2; the failures are prh, vin, erdu, Stress.
The invention provides a superconducting magnet Internet of things system which comprises a superconducting magnet monitoring system, an industrial gateway, a platform monitoring part, a mobile terminal monitoring part and the like.
The monitoring platform 4 carries out real-time monitoring, data acquisition and recording on the running state of the superconducting magnet 1 and displays key parameters on a screen, and the monitoring platform mainly acquires and records the temperature of parts such as 4K Cold, 50K Shield, 50K Unisock, 50K Bore and the like and the liquid helium level of the magnet. The coil of the superconducting magnet 1 works at the extremely low temperature of 4.2K, and the data acquisition difficulty is mainly the accuracy and effectiveness of the acquisition of the temperature, the pressure and the liquid helium level of the magnet in the low-temperature state; according to the invention, a thermometer used by a superconducting magnet 1 is calibrated according to a temperature interval, a formula is fitted, a relevant program is compiled, and an actual temperature value is calculated according to the fitting formula during collection; the magnetic pressure acquisition uses a special magnetic resonance pressure sensor, so that the interference of a strong magnetic field to the sensor is avoided; the magnet liquid level is collected and the liquid level is measured by using a self-made superconducting liquid level meter of the moonlight, and the output current precision of the monitoring system is 0.2mA when the liquid level is measured, so that the accuracy of liquid helium liquid level measurement is realized. When the superconducting magnet breaks down, all parameters of the superconducting magnet are in a continuous change process, the acquired data are compared with the data acquired in the previous 5 times when the data are acquired according to the characteristics, if the data are all in a set reasonable range, the data are considered to be real and effective, otherwise, the data are considered to be invalid, and secondary acquisition is carried out. In order to avoid the interference of a magnetic field or potential difference to the magnet, the superconducting magnet pressure sensor, the temperature sensor and the liquid level meter are well insulated from the magnet when being installed, meanwhile, signals collected in the magnet are transmitted and filtered by the filtering plate, and the filtering plate and the superconducting magnet are monitored and grounded.
When the parameters exceed the threshold value, the magnet monitoring system gives an alarm, and the indicator light and the buzzer are turned on, so that equipment operation or management personnel can process the parameters in time. The magnet monitoring is also provided with a pressure measuring and controlling unit, an EIS heating unit, a compressor state measuring unit, an emergency quench controlling unit, a network serial port and the like. The pressure measuring and controlling unit measures the pressure of the magnet in real time and performs feedback control to ensure that the pressure of the magnet is stabilized at 1950-2150 Pa. The EIS heating unit heats the magnet EIS switch heater every day to eliminate induced current, so that the interference of an external magnetic field on a main magnetic field of the magnet is reduced. The compressor state measuring unit detects the running state (on/off) of the compressor, and if the compressor is in the off state, the indicator light and the buzzer are turned on. The emergency quench control unit is used in an emergency state, and when the switch is pressed, the magnet quenches and the magnetic field disappears. The network serial port is a communication interface and is used for uploading the magnet monitoring data.
The industrial gateway 3 communicates with the superconducting magnet 1 monitoring system, collects 12 parameters thereof, and transmits data to the platform monitoring and mobile terminal monitoring through a mobile network or an optical fiber. The 12 parameters are shown in the table. The alarm divides twelve collected parameter alarm signals into three types of alarms, alarms and faults, wherein the alarms are vbat, 4K cold, 50K neutral, 50K shield, 50K bore, liquid _ level1 and liquid _ level2 faults are as follows: prh, vin, erdu, Stress. As shown in table 1, a parameter table is collected for the alarm system.
TABLE 1
| Serial number | Parameter name | (Code) | |
| 1 | 4K cold head | 4K cold | |
| 2 | 50K cold head | 50k cold | |
| 3 | 50K neck | 50k unisock | |
| 4 | 50K outer shield | 50k shield | |
| 5 | 50K inner panel temperature | 50k bore | |
| 6 | | liquid_level1 | |
| 7 | |
liquid_level2 | |
| 8 | Pressure of magnet | prh | |
| 9 | Terminal voltage of | vbat | |
| 10 | Terminal voltage of switch power supply | vin | |
| 11 | Emergency quench unit status | erdu | |
| 12 | Compressor state | Stress |
The monitoring platform 4 monitors and stores the data returned by the industrial gateway 3, and has the following functions:
firstly, a data billboard: the content is mainly a data information overall situation board, and the client situation, the equipment profile, the equipment alarm profile, the equipment historical state information and the equipment historical alarm information can be known.
II, information management: the information management includes customer information management, device information management, and parameter information management. The client information management is a user information management window under the platform client, is used for managing clients under the flag, knowing the client condition, the equipment number, the information and other conditions, and can modify and delete (only delete logically) the user. The equipment information management is a client equipment information management window of the platform, is used for managing client equipment under the flag, can add, modify, delete and derive the equipment information of the client, can inquire the equipment information and position the client equipment. The parameter information management is a parameter information management window reported by the client equipment of the platform, is used for managing parameters reported by the client equipment under the flag, can add, modify, delete and derive the equipment parameter information of the client, and can inquire the equipment reported parameter information according to the set inquiry information.
Thirdly, alarm management: the alarm management comprises alarm rules, alarm management and work order management. The alarm rule sets a management window for the equipment alarm rule information, is used for setting the rule of reporting the alarm by the equipment, can add, modify, delete and export the equipment information of the client, and can inquire the equipment reporting parameter information according to the set inquiry information. The alarm management is an equipment alarm information management window which is used for managing the alarm information of the equipment, inquiring and exporting the alarm information, and also can manually dispatch the alarm which is not set to automatically generate the work order. The work order management is an equipment work order information management window which is used for managing the work order information of the equipment and inquiring and exporting the work order information, a work order processor can manually receive the work order, and a last work order processing report is required to upload a processing process after the work order processing is finished. All authorities can see the work order processing person receiving the work order and the report of the work order processing.
Fourthly, operation statistics: the operation statistics comprise three items of equipment operation state, equipment index trend and equipment historical data. The device running state is a device running state viewing window used for viewing the running state of the device, inquiring and exporting the device state information, and real-time device data of a single device can be viewed by clicking a viewing button. The equipment index trend is an equipment index trend viewing window used for viewing the index trend of the equipment, and the equipment index trend information can be inquired and derived, and a single equipment can automatically generate an index trend graph at the same time. The device history data is a device history operation data viewing window used for viewing the history state of the device and inquiring and deriving the device history state information.
Fifthly, system management: the system management comprises role management, user management and configuration management. The role management is a user role management window, and is mainly used for configuring corresponding roles for related personnel, such as authority of equipment manager, operators and after-sales engineers in role. The user management is a user information management window, and is mainly used for opening an account for a user and controlling the starting, stopping and modifying of the account.
Palm data checking: the palm data checking is carried out by the programmed WeChat small program, and comprises a data billboard, a real-time status checking unit, an alarm management unit and a work order gathering unit. Similar to the PC end, the data information integral condition signboard is mainly used; checking the real-time state of each device, and displaying the 12 collected parameters; the alarm condition billboard displays the running states of all the devices; and the work order tracking billboard displays the summary of the work orders and the state statistics.
In conclusion, the superconducting magnet internet of things system realizes interconnection and intercommunication of the magnetic resonance superconducting magnet, the magnet monitoring, the platform end and the mobile end, only one computer or one mobile phone is needed to check the real-time operation data of each superconducting magnet at any time and any place, and the functions of fault short message alarm and work order progress tracking are realized. The device is greatly convenient for device operators and device managers to check the devices on site every day, and the larger loss caused by the fact that the first maintenance time is missed due to non-working time or holiday faults is avoided. After-sale personnel of equipment manufacturers can perform pre-judgment according to the parameter trend of the superconducting magnet to prevent the superconducting magnet from getting ill in the past, perform remote diagnosis when the superconducting magnet fails, and make a pre-planned work order, so that the working efficiency is improved, and the timeliness of problem handling is improved.
It will thus be seen that the objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in an implementation that can be modified at will without departing from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the claims.
Claims (10)
1. A magnetic resonance superconducting magnet thing networking system, includes superconducting magnet, its characterized in that: the signal output end of the superconducting magnet (1) is connected with the signal input end of the superconducting magnet monitoring module (2), and the signal output end of the superconducting magnet monitoring module (2) is connected with the monitoring platform (4) through the industrial gateway (3); the monitoring platform (4) is respectively connected with a hospital equipment department (5) and an equipment manufacturer (6).
2. The magnetic resonance superconducting magnet internet of things system according to claim 1, wherein: the monitoring platform (4) is connected with the mobile terminal (7) through a wireless network.
3. The magnetic resonance superconducting magnet internet of things system according to claim 1, wherein: the superconducting magnet (1) is at least provided with 1 superconducting magnet.
4. A magnetic resonance superconducting magnet internet of things system according to claim 2, wherein: the mobile terminal (7) is one or more of a mobile phone terminal and a PC terminal.
5. A magnetic resonance superconducting magnet internet of things system according to claim 1 or 2, wherein: the work of the monitoring platform (4) comprises real-time monitoring, data acquisition, recording and parameter display on a screen.
6. The magnetic resonance superconducting magnet internet of things system according to claim 5, wherein: the data collected by the monitoring platform (4) comprise the temperature of the 4K Cold, 50K Shield, 50K Unisock and 50K Bore parts and the liquid helium level value of the superconducting magnet (1).
7. The magnetic resonance superconducting magnet internet of things system according to claim 1, wherein: the superconducting magnet monitoring module (2) comprises a pressure measuring and controlling unit, an EIS heating unit, a compressor state measuring unit, an emergency quench controlling unit and a network serial port.
8. The magnetic resonance superconducting magnet internet of things system of claim 7, wherein: the pressure measuring and controlling unit measures the pressure of the superconducting magnet (1) in real time and performs feedback control to ensure that the pressure of the superconducting magnet (1) is stabilized at 1950-2150 Pa;
the EIS heating unit heats an EIS switch heater of the superconducting magnet (1) every day to eliminate induced current, so that the interference of an external magnetic field on a main magnetic field of the magnet is reduced;
the compressor state measuring unit detects the running state of the compressor, and if the compressor is in a closed state, the indicator light and the buzzer are turned on;
the emergency quench control unit is used in an emergency state, and at the moment, the switch is pressed, the magnet quenches, and the magnetic field disappears;
the network serial port is a communication interface and is used for uploading the magnet monitoring data.
9. The magnetic resonance superconducting magnet internet of things system according to claim 1, wherein: the specific working process is as follows:
(1) the monitoring platform acquires data through the superconducting magnet monitoring module;
(2) after data are collected, calculating an actual temperature value according to a fitting formula;
(3) when data are collected, comparing the collected data with the data collected in the previous 5 times, if the data are all in a set reasonable range, considering the data to be real and effective, and otherwise, considering the data to be invalid, and carrying out secondary collection;
(4) if the data is not in the set reasonable range, the monitoring platform can carry out warning, alarming and fault processing according to the type of the data and send the information to the hospital equipment department and equipment manufacturers;
(5) and processing according to the data exception by related personnel.
10. The magnetic resonance superconducting magnet internet of things system of claim 9, wherein: the warning is vbat; the alarms are 4K cold, 50K instant, 50K shield, 50K bore, liquid _ level1 and liquid _ level 2; the failures are prh, vin, erdu, Stress.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116158750A (en) * | 2023-04-18 | 2023-05-26 | 安徽硕金医疗设备有限公司 | Magnetic resonance temperature imaging method and system |
| CN116567038A (en) * | 2023-07-07 | 2023-08-08 | 长沙智医云科技有限公司 | Medical equipment operation monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211318271U (en) * | 2019-10-21 | 2020-08-21 | 汤福南 | Nuclear magnetic resonance liquid helium monitoring device based on raspberry group and Internet of things |
| CN113012888A (en) * | 2021-03-18 | 2021-06-22 | 上海辰光医疗科技股份有限公司 | Multifunctional monitoring system for superconducting magnet |
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2021
- 2021-07-28 CN CN202110854623.5A patent/CN113567900A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211318271U (en) * | 2019-10-21 | 2020-08-21 | 汤福南 | Nuclear magnetic resonance liquid helium monitoring device based on raspberry group and Internet of things |
| CN113012888A (en) * | 2021-03-18 | 2021-06-22 | 上海辰光医疗科技股份有限公司 | Multifunctional monitoring system for superconducting magnet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116158750A (en) * | 2023-04-18 | 2023-05-26 | 安徽硕金医疗设备有限公司 | Magnetic resonance temperature imaging method and system |
| CN116567038A (en) * | 2023-07-07 | 2023-08-08 | 长沙智医云科技有限公司 | Medical equipment operation monitoring system |
| CN116567038B (en) * | 2023-07-07 | 2023-10-13 | 长沙智医云科技有限公司 | Medical equipment operation monitoring system |
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Application publication date: 20211029 |
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