CN112393772A - Insulin pump metering and calibrating device - Google Patents
Insulin pump metering and calibrating device Download PDFInfo
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- CN112393772A CN112393772A CN202011307080.7A CN202011307080A CN112393772A CN 112393772 A CN112393772 A CN 112393772A CN 202011307080 A CN202011307080 A CN 202011307080A CN 112393772 A CN112393772 A CN 112393772A
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- NOESYZHRGYRDHS-UHFFFAOYSA-N insulin Chemical compound N1C(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(NC(=O)CN)C(C)CC)CSSCC(C(NC(CO)C(=O)NC(CC(C)C)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CCC(N)=O)C(=O)NC(CC(C)C)C(=O)NC(CCC(O)=O)C(=O)NC(CC(N)=O)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CSSCC(NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2C=CC(O)=CC=2)NC(=O)C(CC(C)C)NC(=O)C(C)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2NC=NC=2)NC(=O)C(CO)NC(=O)CNC2=O)C(=O)NCC(=O)NC(CCC(O)=O)C(=O)NC(CCCNC(N)=N)C(=O)NCC(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC(O)=CC=3)C(=O)NC(C(C)O)C(=O)N3C(CCC3)C(=O)NC(CCCCN)C(=O)NC(C)C(O)=O)C(=O)NC(CC(N)=O)C(O)=O)=O)NC(=O)C(C(C)CC)NC(=O)C(CO)NC(=O)C(C(C)O)NC(=O)C1CSSCC2NC(=O)C(CC(C)C)NC(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CC(N)=O)NC(=O)C(NC(=O)C(N)CC=1C=CC=CC=1)C(C)C)CC1=CN=CN1 NOESYZHRGYRDHS-UHFFFAOYSA-N 0.000 title claims abstract description 222
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Classifications
-
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses an insulin pump metering and calibrating device, which comprises an electronic weighing module, a weighing module and a control module, wherein the electronic weighing module is used for measuring the weight of an insulin pump to be measured in different detection states; the pressure testing module is used for testing the pressure at the tail end of the insulin pump infusion pipeline; the flow control module is used for detecting the infusion flow of the insulin pump; the microcontroller module is electrically connected with the electronic weighing module, the pressure testing module and the flow control module; the invention solves the detection of the metering characteristics of insulin pump basic rate infusion indicating value error, large dose infusion indicating value error, infusion flow indicating value error and repeatability, infusion pressure safety and the like; the detection and tracing of the real-time infusion flow indicating error item of the insulin pump are realized.
Description
Technical Field
The invention relates to a metering calibration product, in particular to an insulin pump metering calibration device.
Background
The insulin pump is an instrument which is controlled by a microcomputer to pump exogenous insulin into a human body timely, quantitatively and accurately. The device simulates the physiological mode that healthy pancreas of a human body secretes insulin, is internally provided with a drug storage device, continuously injects the insulin to the subcutaneous part of a user according to the dosage required by the human body through an infusion pipeline connected with the drug storage device, and keeps the blood sugar stability all day long so as to achieve the purpose of controlling diabetes. At present, insulin pumps are increasingly applied to clinical treatment of diabetes patients, and have good curative effect.
The design performance of an insulin pump is of utmost importance, especially its accuracy of administration. Too much or too little insulin injection is likely to result if the administration accuracy is low. The insulin pump is a fluid pump requiring high precision, and trace insulin errors easily cause irrecoverable consequences, particularly the fact that the human body hyperglycemia is directly caused by too little insulin of the human body, and then diabetic complications are caused; too much insulin in a human body can cause hypoglycemia and even shock or death of a patient; the safety of the insulin pump is more directly related to the life safety of the user.
At present, suspicious adverse events of medical instruments related to insulin pumps and infusion pipelines thereof are frequent, wherein the suspicious adverse events mainly comprise insensitive buttons of the insulin pumps, low medicament injection dosage, broken injection needles and the like. Through analysis, the clinical operation and nursing are not standard and are the main reasons of the occurrence of injury events, and the injury caused by unqualified product quality also needs to be noticed.
With the improvement of living standard and the change of life style of people, diabetes becomes a frequently encountered disease and a common disease and becomes the third killer after cardiovascular and cerebrovascular diseases and cancers in human beings. Insulin pumps are becoming more widely used and their manufacture and production is also "flowering" throughout the day.
In view of that the accuracy of the infusion flow of the insulin pump is crucial to the infusion safety and effectiveness in the use process, the device is necessary and has important practical significance for avoiding the occurrence of relevant adverse events of the insulin pump as much as possible, strengthening the post-incident supervision on the quality of the insulin pump and ensuring the accuracy, reliability and traceability of the infusion quantity value data of the insulin pump.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention aims to provide the metering and calibrating device for the insulin pump, which has high detection precision and strong safety.
The technical scheme is as follows: an insulin pump metering calibration device comprising:
the electronic weighing module is provided with a weighing sensor and is used for measuring the weight of the insulin pump to be measured in different detection states;
the pressure testing module is provided with a pressure sensor and is used for testing the pressure at the tail end of the insulin pump infusion pipeline;
the flow control module is used for detecting the infusion flow of the insulin pump;
the microcontroller module is electrically connected with the electronic weighing module, the pressure testing module and the flow control module, and is used for receiving and processing an electronic weighing signal, a pressure testing signal and a flow signal and outputting a control signal; the microcontroller module comprises a power management unit, a communication conversion unit and a liquid crystal touch screen unit, wherein the power management unit is used for supplying power for each module of the device, the communication conversion unit is used for completing wireless data communication uploading of the microcontroller module, and the liquid crystal touch screen unit comprises a plurality of function keys and is used for reaching a metering characteristic detection command during man-machine interaction and displaying result parameters.
Further, the function keys comprise a basal rate infusion indicating value error detection function key, a large-dose infusion indicating value error detection function key, an infusion flow indicating value error and repeatability detection function key and an infusion pressure safety detection function key.
Furthermore, a temperature sensor is arranged on a pipeline where the flow control module is arranged and used for detecting the temperature change of the infusion liquid in real time, and the temperature sensor is electrically connected with the microcontroller module.
Specifically, the infusion port of the insulin pump to be tested is connected to a tee joint through a hose, and the other two ends of the tee joint are respectively connected with an electromagnetic valve and a pressure testing module; the electromagnetic valve is connected with the flow control module through a hose; the temperature sensor is arranged on a hose pipeline between the electromagnetic valve and the flow control module; the microcontroller module controls the valve switch of the electromagnetic valve, when the electromagnetic valve is closed, the liquid of the infusion port of the insulin pump to be tested directly flows into the pressure testing module through the tee joint, and the liquid pressure is detected; when the solenoid valve was opened, the liquid of insulin pump infusion mouth that awaits measuring passed through the tee bend, and direct inflow solenoid valve through the hose that is equipped with temperature sensor, flow through flow control module carries out the measuring of liquid flow.
Furthermore, the communication conversion unit comprises a WIFI module and is used for wirelessly uploading data.
Furthermore, the stress surface of the weighing sensor is provided with a tray, and the insulin pump to be tested is arranged on the tray.
Furthermore, the flow control module is provided with a nano-upgrading flow sensor.
Furthermore, the electronic weighing module, the flow control module, the temperature sensor and the pressure testing module are respectively provided with a corresponding signal amplifying and filtering circuit and a corresponding signal conditioning circuit, and the signal amplifying and filtering circuit and the signal conditioning circuit are used for conditioning the output signal of the sensor and are electrically connected with the input end of the microcontroller module after being converted by the analog-to-digital conversion circuit.
Preferably, the tail end of the device is also provided with a liquid collecting groove for collecting waste liquid.
Compared with the prior art, the invention has the following remarkable effects: the device has the advantages of simple structure, convenient operation, high safety and high detection precision, and can be used for adding tiles for the outlet of the pharmaceutical industry standard of the insulin pump, the metering and verification rule or the calibration standard of the insulin pump.
Drawings
FIG. 1 is a schematic view of a structure of a metering calibration device of an insulin pump;
FIG. 2 is a schematic block diagram of an insulin pump metering calibration apparatus;
FIG. 3 is a flow chart of primary metrology feature detection.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the following examples and accompanying drawings.
As shown in fig. 1-2, the metering and calibrating device for insulin pump mainly comprises an electronic weighing module 1, a flow control module 2, a pressure testing module 3, a temperature sensor 4, a microcontroller module 5 and a liquid collecting tank 6. The microcontroller module 5 is electrically connected with the electronic weighing module 1, the flow control module 2, the pressure testing module 3 and the temperature sensor 4 and is responsible for the work of the whole system.
The electronic weighing module 1 is provided with a weighing sensor for measuring the weight of the insulin pump 7 to be measured in different detection states.
The pressure testing module 3 is provided with a pressure sensor for testing the pressure at the tail end of the infusion pipeline of the insulin pump 7 so as to ensure the safety of the infusion pressure of the insulin pump.
The flow control module 2 is provided with a sodium-upgrading flow sensor for detecting the infusion flow of the insulin pump.
The pipeline of the flow control module 2 is provided with a temperature sensor 4 for detecting the temperature change of the infusion liquid in real time, so that a microenvironment required during flow detection is ensured, and the influence of the temperature change on the micro flow detection is reduced to the minimum.
The electronic weighing module 1, the flow control module 2, the temperature sensor 4 and the pressure testing module 3 are provided with a corresponding signal amplification filter circuit, a corresponding signal conditioning circuit and a corresponding analog-to-digital conversion circuit, and the signal amplification filter circuit, the corresponding signal conditioning circuit and the corresponding analog-to-digital conversion circuit are used for conditioning output signals of the sensors and are electrically connected with the input end of the microcontroller module 5 after analog-to-digital conversion. The weighing sensor of the electronic weighing module 1 and the corresponding conditioning circuit are arranged in a rectangular casing, and a tray is arranged on the stress surface of the weighing sensor.
Furthermore, the microcontroller module is also provided with a power management unit, a communication conversion unit and a liquid crystal touch screen unit; the power supply management unit is responsible for completing 220V voltage transformation and supplying power to the whole system (comprising an electronic weighing module, a flow control module, a temperature sensor and a pressure testing module); the communication conversion unit is responsible for finishing wireless data communication uploading of the microcontroller module (a WIFI module can be selected); the liquid crystal touch screen unit can select corresponding function keys to issue measurement characteristic detection commands and display result parameters. The function keys comprise a basal rate infusion indicating value error detection function key, a large dose infusion indicating value error detection function key, an infusion flow indicating value error and repeatability detection function key and an infusion pressure safety detection function key.
In this embodiment, the microcontroller module adopts an STM32F2 series high-performance single chip microcomputer as a main control microprocessor. Nanoliter flow sensors recommend the use of a Switzerland Sensirion SLG1430 series flow meter. The infusion port of the insulin pump 7 to be tested is connected to a tee joint through a hose, and the other two ends of the tee joint are respectively connected with the electromagnetic valve 8 and the pressure testing module. The solenoid valve 8 is connected with the flow control module 2 through a hose, the hose pipelines of the solenoid valve 8 and the flow control module 2 are provided with the temperature sensor 4, and the other end of the flow sensor 2 discharges the waste liquid after the test into the liquid collecting tank 6 through the hose. The microcontroller module 5 controls the valve switch of the electromagnetic valve 8, when the electromagnetic valve 8 is closed, the liquid of the infusion port of the insulin pump 7 to be tested directly flows into the pressure testing module 3 through the tee joint to detect the liquid pressure; when the solenoid valve 8 is opened, the liquid of the infusion port of the insulin pump 7 to be detected directly flows into the solenoid valve 8 through the tee joint, flows through the flow control module 2 through the hose provided with the temperature sensor 4, and detects the liquid flow.
From the usual dose of insulin, 3mL of 300 units of insulin (300U), 3mL/300 ═ 10 μ L of volume per 1U of insulin, and the measurement of the metering characteristics of the insulin pump was carried out using distilled water instead of the insulin injection, and it was found that the density of water at ordinary temperature was 1g/cm3The volume of the infusion liquid can be converted by measuring the mass difference of the insulin pump before and after infusion through a weighing sensor with milligram-level precision, so that the injection amount of the insulin is further converted.
As shown in fig. 3, the measurement characteristic detection based on the insulin pump measurement calibration device includes the following contents:
1. basal rate infusion indication error detection: and carrying out test operation in a normal-temperature closed experimental environment, clicking a basic rate infusion indicating value error detection function key of the liquid crystal touch screen unit of the microprocessor module, and entering the detection of the basic rate infusion indicating value error metering characteristic.
The drug storage device of the insulin pump to be tested is filled with distilled water, placed on a weighing sensor tray of the electronic weighing module, used for weighing the insulin pump to be tested and transmitting a data signal to the microprocessor module for storage; the basic infusion rate of the insulin pump is respectively set to be 0.05U/h, 17.5U/h and 35U/h, the injection time is respectively 24h, 6h and 2h, the insulin pump is weighed again after the injection is finished, the mass difference before and after the microprocessor module calculates and converts the mass difference into the volume of the injected liquid, the volume is divided by 10 mu L to obtain the amount of the injected insulin, the injected insulin is compared with the injection amount displayed by the equipment, the basic rate infusion indicating value error is calculated through verification, and the basic rate infusion indicating value error is displayed on the liquid crystal touch screen unit.
2. Large dose infusion indication error detection: and carrying out test operation in a normal-temperature closed experimental environment, clicking a large-dose infusion indicating value error detection function key of the liquid crystal touch screen unit of the microprocessor module, and entering detection of large-dose infusion indicating value error metering characteristics.
The drug storage device of the insulin pump to be tested is filled with distilled water, placed on a weighing sensor tray of the electronic weighing module, used for weighing the insulin pump to be tested and transmitting a data signal to the microprocessor module for storage; setting the basic infusion rate of the insulin pump to 10U/h and 25U/h respectively, and injecting; after the injection is finished, the insulin pump is weighed again, the microprocessor module calculates the unit amount of the injected insulin, the unit amount of the injected insulin is compared with the injection amount displayed by the equipment for verification, the unit amount of the injected insulin is continuously set and subjected to infusion verification for 6 times, the large-dose infusion indicating value error is calculated, and the large-dose infusion indicating value error is displayed on the liquid crystal touch screen unit.
3. Infusion flow indication error and repeatability: and (4) carrying out test operation in a normal-temperature closed experimental environment, clicking an infusion flow indicating error and repeatability detection function key of the liquid crystal touch screen unit of the microprocessor module, and entering the detection of the infusion flow indicating error and repeatability metering characteristics.
The infusion flow indicating error and repeatability metering characteristic detection means mainly tests the relationship between the flow rate of the insulin pump and other conditions (waveform, driving voltage, frequency, backpressure, pipe diameter and the like) and the stability and other problems of the insulin pump, utilizes a nanoliter flow sensor to measure the flow of liquid flowing out of an infusion outlet of the insulin pump in a period of time, and establishes the relationship between the flow rate and other parameters.
The insulin pump medicine storage device to be detected is filled with distilled water and placed on a weighing sensor tray of an electronic weighing module, the insulin pump to be detected is weighed, and a data signal is transmitted to a microprocessor module to be stored as an input basic parameter; setting the basic infusion rate of the insulin pump to 0.1U/h, 0.5U/h, 1U/h, 5U/h, 10U/h, 20U/h and 30U/h respectively, and injecting; after each injection is stable, the microcontroller module records the current instantaneous flow rate for 6 times, compares the instantaneous flow rate with the flow rate set by the standard, calculates the error and repeatability of flow indication values, and obtains an accumulated flow value according to the flow rate and time.
Tracing: the accuracy means of the developed flow control module is verified through a high-precision micro-flow injection pump, an electronic weighing module and a liquid collecting tank: the high-precision micro-flow injection pump is connected with a three-way input port of the insulin pump metering and calibrating device through a hose, an electromagnetic valve is opened, the high-precision micro-flow injection pump injects liquid at a certain flow speed, the weight of the liquid in the liquid collecting tank is weighed through the electronic weighing module, and the accuracy verification of the flow control module is carried out.
4. And (3) infusion pressure safety detection:
when the insulin pump is used for insulin injection, the insulin pump completes the insulin infusion through a needle embedded in subcutaneous tissues of the abdomen of a human body. Therefore, the pressure provided by the end of the needle is larger than the pressure of the subcutaneous tissue fluid of the human body, so as to ensure the normal injection and diffusion of the insulin. When the human body moves or the skin medium changes, the pressure at the tail end of the needle can change. Therefore, the infusion pressure safety detection means mainly tests that the pressure at the tail end of a water injection pipeline of the insulin pump is larger than 13.7PSI (94.46 kPa).
And (4) carrying out test operation in a normal-temperature closed experimental environment, clicking an infusion pressure safety detection function key of the liquid crystal touch screen unit of the microprocessor module, and entering the detection of the infusion pressure safety metering characteristic. The basic infusion rate of the insulin pump is respectively set to be 0.05U/h, 17.5U/h and 35U/h, when the pressure measured by the built-in pressure sensor of the pressure test module is larger than 13.7PSI (94.46kPa), the fact that the needle head at the tail end of the insulin pump can provide enough infusion pressure is shown, normal infusion can be performed under the conditions that human skin media change and the like, and the requirement on the safety of the infusion pressure is met.
5. Detection of other metering characteristics:
1) temperature alarm detection: as known from the chemical properties of insulin, insulin freezes at about 0 deg.C and deteriorates at high temperatures, generally not higher than 40 deg.C.
The combination device of the constant temperature box and the constant temperature circulating water tank provides a constant temperature environment for detecting the metering characteristics. The insulin pump to be detected is placed in the thermostat, the temperature of the thermostat is adjusted to enable the thermostat to be higher than the upper limit value or lower than the lower limit value of the insulin pump medicine storage device, and whether the insulin pump immediately triggers the alarm system with temperature abnormality information or not and the user is warned to take corresponding measures to achieve the purpose.
Since the constant temperature box and the constant temperature circulating water tank belong to mature technologies, the constant temperature box and the constant temperature circulating water tank are easy to obtain in the market and are not described here.
2) Medicine storage residue alarming: insulin pumps all have the detection function to remaining dose, mainly in order to prevent that the user from setting up the infusion volume after, insulin reserves are not enough, causes insulin infusion volume to reduce. The function can inform the user of preparing for replacing the medicine storage device in advance, and the occurrence of hyperglycemia is prevented.
Carry out test operation under the airtight experimental environment of normal atmospheric temperature, store up medicine and remain warning measurement characteristic detection means, when adjusting remaining dose in the medicine storage device and making the liquid measure reach certain unit to through the electron weighing module, the surplus dose of weighing is rechecked, whether can report to the police through the inspection instrument and indicate so that the user in time changes the medicine storage device and go on.
3) Transfusion blockage alarm: in order to ensure the safety of insulin pump infusion, the infusion process is ensured to be in a controllable and safe state.
The test operation is performed in a normal-temperature closed experimental environment, a blocking alarm threshold (pressure) specified by the manufacturer is selected, and if the blocking alarm threshold (pressure) can be selected, the minimum value is set. The insulin pump was started and the flow reached steady state, and the situation from the beginning of occlusion to the triggering of the occlusion alarm was observed.
Claims (9)
1. An insulin pump metering calibration device, comprising:
the electronic weighing module is provided with a weighing sensor and is used for measuring the weight of the insulin pump to be measured in different detection states;
the pressure testing module is provided with a pressure sensor and is used for testing the pressure at the tail end of the insulin pump infusion pipeline;
the flow control module is used for detecting the infusion flow of the insulin pump;
the microcontroller module is electrically connected with the electronic weighing module, the pressure testing module and the flow control module, and is used for receiving and processing an electronic weighing signal, a pressure testing signal and a flow signal and outputting a control signal; the microcontroller module comprises a power management unit, a communication conversion unit and a liquid crystal touch screen unit, wherein the power management unit is used for supplying power for each module of the device, the communication conversion unit is used for completing wireless data communication uploading of the microcontroller module, and the liquid crystal touch screen unit comprises a plurality of function keys and is used for reaching a metering characteristic detection command during man-machine interaction and displaying result parameters.
2. The insulin pump metering calibration device of claim 1, wherein: the function keys comprise a basal rate infusion indicating value error detection function key, a large dose infusion indicating value error detection function key, an infusion flow indicating value error and repeatability detection function key and an infusion pressure safety detection function key.
3. The insulin pump metering calibration device of claim 1, wherein: and a temperature sensor is also arranged on the pipeline where the flow control module is arranged and used for detecting the temperature change of the infusion liquid in real time, and the temperature sensor is electrically connected with the microcontroller module.
4. The insulin pump metering calibration device of claim 3, wherein: the infusion port of the insulin pump to be tested is connected to a tee joint through a hose, and the other two ends of the tee joint are respectively connected with an electromagnetic valve and a pressure testing module;
the electromagnetic valve is connected with the flow control module through a hose; the temperature sensor is arranged on a hose pipeline between the electromagnetic valve and the flow control module;
the microcontroller module controls the valve switch of the electromagnetic valve, when the electromagnetic valve is closed, the liquid of the infusion port of the insulin pump to be tested directly flows into the pressure testing module through the tee joint, and the liquid pressure is detected; when the solenoid valve was opened, the liquid of insulin pump infusion mouth that awaits measuring passed through the tee bend, and direct inflow solenoid valve through the hose that is equipped with temperature sensor, flow through flow control module carries out the measuring of liquid flow.
5. The insulin pump metering calibration device of claim 1, wherein: the communication conversion unit comprises a WIFI module and is used for wirelessly uploading data.
6. The insulin pump metering calibration device of claim 1, wherein: weighing sensor atress face is equipped with the tray, and the insulin pump that awaits measuring is arranged in on the tray.
7. The insulin pump metering calibration device of claim 1, wherein: the flow control module is provided with a nano-upgrading flow sensor.
8. The insulin pump metering calibration device of claim 1, wherein: the electronic weighing module, the flow control module, the temperature sensor and the pressure testing module are respectively provided with a corresponding signal amplifying and filtering circuit and a corresponding signal conditioning circuit, and the signal amplifying and filtering circuit and the signal conditioning circuit are used for conditioning output signals of the sensor and are electrically connected with the input end of the microcontroller module after being converted by the analog-to-digital conversion circuit.
9. The insulin pump metering calibration device of claim 1, wherein: the tail end of the device is also provided with a liquid collecting tank for collecting waste liquid.
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| CN202011307080.7A CN112393772B (en) | 2020-11-20 | 2020-11-20 | Insulin pump metering and calibrating device |
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| CN202011307080.7A CN112393772B (en) | 2020-11-20 | 2020-11-20 | Insulin pump metering and calibrating device |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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