CN109394193B - Method for calibrating real-time clock of dynamic blood pressure recorder - Google Patents
Method for calibrating real-time clock of dynamic blood pressure recorder Download PDFInfo
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Abstract
A method for calibrating a real-time clock of a dynamic blood pressure recorder comprises the steps that through setting a calibration area in a storage area, when a system runs for one calibration error time, a high bit (1) of the corresponding calibration area is changed into a low bit (0), when the calibration area has a bad block, the system still runs as long as the high bit is changed into the low bit after the bad block, and when the running time exceeds a calibration time limit, calibration fails, and a time limit mark is changed from the high bit (1) to the low bit (0); the invention solves the problem of real-time clock deviation caused by a recorder due to a complex electromagnetic environment or data transmission interface interference and also avoids the error of real-time clock calibration caused by improper reading of data bits; meanwhile, the accuracy and the reliability of the real-time clock of the dynamic blood pressure recorder are greatly improved, and the phenomenon of disordered measurement process caused by incorrect real-time clock is avoided.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a method for calibrating a real-time clock of a dynamic blood pressure recorder.
Technical Field
The blood pressure is an important index reflecting physiological parameters such as the heart pumping function, the vascular resistance, the blood viscosity, the systemic blood volume and the like, and has important clinical diagnosis value. With the development of electronic technology, computers and signal processing, the automatic noninvasive blood pressure monitoring technology is widely applied clinically. Blood pressure has a significant time-varying characteristic, and single or few measurements of blood pressure taken in a clinic do not reliably reflect fluctuations in blood pressure and conditions of activity. Ambulatory blood pressure measurement is a diagnostic technique for automatically and intermittently measuring blood pressure in daily life at regular intervals within 24 hours. Because the dynamic blood pressure overcomes the limitations of few times of measuring the blood pressure, observation error, white overcoat effect and the like in clinics and can objectively reflect the actual level and fluctuation condition of the blood pressure, the dynamic blood pressure is more and more widely applied to the aspects of determining the diagnosis of suspected hypertension patients, judging the white overcoat hypertension and the intractable hypertension, evaluating the curative effect of antihypertensive drugs, guiding the treatment and the like.
In clinical application of ambulatory blood pressure, the measurement frequency of different time periods in a measurement cycle needs to be set, and then the device can monitor and record blood pressure data of a patient according to the preset working frequency. Therefore, the dynamic blood pressure recorder as the acquisition equipment is required to have a very accurate and reliable real-time clock system, and on the basis of the system, the recorder can accurately and reliably work according to the set working frequency without the phenomenon of disordered measurement process.
Ambulatory blood pressure recorders typically incorporate a real-time clock chip. Real-time clock chips are one of the most widely used consumer electronics products in daily life. It provides accurate real-time for people or provides an accurate time reference for electronic systems.
However, in an actual use environment, a user finds that when the dynamic blood pressure recorder is used for recording data, the environment around the real-time clock or the transmission of the data affects the real-time clock of the recorder. When the recorder is in a data recording state, the electromagnetic environment around the real-time clock becomes more complex, so that the real-time clock of the recorder generates deviation; when the recorder is in a data transmission state, the level changes at the moment that a data transmission interface is connected with an upper computer, and the change can interfere with a real-time clock, so that the deviation or the error is generated between the start time and the transmission time of data transmission.
The occurrence of the above problems directly causes the confusion and uncertainty of the measurement process, and how to avoid the occurrence of the phenomenon becomes an important index of the reliability of the dynamic blood pressure recorder product; the contradiction between the importance of the real-time clock and its unreliability makes it imperative to solve this technical application problem.
Disclosure of Invention
In order to overcome the contradiction between the importance of a real-time clock and the unreliability of the real-time clock, the invention aims to provide a method for calibrating the real-time clock of a dynamic blood pressure recorder, which solves the problem of real-time clock deviation caused by the interference of a recorder due to a complex electromagnetic environment or a data transmission interface and avoids the error of real-time clock calibration caused by improper reading of data bits; when the recorder is restarted or data is transmitted, the recorder calibrates the real-time clock, compares the time of the system clock with the time of the real-time clock, and if the error of the system clock and the time of the real-time clock exceeds a specified error, the time of the system clock needs to be adjusted to ensure the accuracy and reliability of the recorder for recording the patient data corresponding to the time, so that the phenomenon of disordered measurement process caused by incorrect system clock is avoided.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for calibrating a real-time clock of a dynamic blood pressure recorder comprises the following steps:
step one, design of real-time clock calibration storage area 101
The real time clock calibration storage area 101 is divided into 3 sections: a time stamp 102, a calibration area 103 and a time limit identification 104, the memory area 101 being sized according to the calibration error and the calibration time limit.
After the recorder is started, all data bits of the storage area 101 are in high order 1, and the starting time of the recorder is X years, X months, X days, X minutes and X seconds, which are expressed by the first six bytes and written in the time stamp 102;
during the calibration time limit, each time the recorder runs a calibration error, one byte in the calibration area 103 changes from high 1 to low 0; because the storage area 101 occasionally has a bad block or unreadable data bit, the calibration area 103 uses a plurality of data bits, and uses an or relationship to avoid the problem, and in the reading process of the storage area 101, as long as the value of the currently read word and byte is less than the maximum value of the word or byte, the system is indicated to normally operate, and the flag bit is effectively modified; when the running time exceeds the calibration time limit, the time limit identifier 104 is changed from high 1 to low 0, at this time, the function of the recorder for automatically calibrating the real-time clock is disabled, and the subsequent calibration enters a manual calibration mode;
step two, design of calibration of the dynamic blood pressure recorder under different working states
The recorder is in continuous recording state, after every measurement, the next measurement interval is calculated,
the recorder starts the data transmission and,
thirdly, the recorder is in a data continuous transmission state, a calibration time interval (such as 5 minutes) is set,
the real-time clock calibration needs to be carried out on the recorder, when the real-time clock is calibrated, the time recorded by the timestamp is added with the running time period of the calibration area to obtain the time of the real-time clock, the time is compared with the system clock, and if the error between the time and the time exceeds the specified error, the system clock needs to be adjusted to achieve the purpose of real-time clock calibration.
Fourthly, the recorder automatically restarts to enter a recording state due to the complex electromagnetic environment,
the recorder is restarted due to the interference of electromagnetic compatibility on the transmission interface,
and fifthly, the recorder is automatically restarted immediately after being halted by the software watchdog and the hardware watchdog to ensure the normal work of the system and the reliability of the calibration function, the time of the real-time clock is obtained by adding the time recorded by the timestamp and the running time period of the calibration area after the recorder is started, the time is compared with the system clock, and if the error between the time and the time exceeds the specified error, the system clock is adjusted to achieve the purpose of calibrating the real-time clock.
The invention has the beneficial effects that:
1. the real-time clock time is obtained by adding the time when the timestamp (102) starts recording and the running time period of the calibration area (103), and compared with the system clock, the real-time clock calibration is carried out, so that the real-time clock time of the system can not be disordered when a user uses the dynamic blood pressure equipment, the precision of the system clock is improved, and the guarantee is provided for more accurately obtaining the blood pressure information of the patient.
2. The one-to-one correspondence between the recorded information of the dynamic blood pressure recorder and the real-time clock is greatly improved, and the recorder can still record accurate patient information and corresponding time under the environments of data transmission, restarting and the like.
Drawings
FIG. 1 is a partitioning of a storage area of the present invention.
FIG. 2A is a schematic flow chart of the present invention within the real time clock calibration zone; fig. 2B is an illustrative diagram of the flow within the real time clock calibration zone.
FIG. 3 is a block flow diagram of the ambulatory blood pressure recorder real-time clock calibration of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
A method for calibrating a real-time clock of a dynamic blood pressure recorder is disclosed, referring to fig. 3, after the recorder is started, the recorder enters a working state, and then the real-time clock information is read and calibrated. During calibration, the real-time clock is compared with the system clock, and if the error between the real-time clock and the system clock exceeds a specified error, the system clock needs to be adjusted, so that the recorder works normally, and the method specifically comprises the following steps:
step one, see fig. 1, design of real time clock calibration storage 101
The real time clock calibration storage area 101 is divided into 3 sections: a time stamp 102, a calibration area 103 and a time limit identification 104, the memory area 101 being sized according to the calibration error and the calibration time limit.
After the recorder starts, all data bits of the memory area 101 are at high 1. The starting time of the recorder is X years, X months, X days, X minutes and X seconds, which are expressed by the first six bytes and written in the time stamp 102;
in the calibration time limit, each time the recorder runs a calibration error, the calibration area 103 changes one byte or one bit and the like from high 1 to low 0; since the storage area 101 occasionally has a bad block or unreadable data bit, the calibration area 103 uses a plurality of data bits, and uses an or relationship to avoid the problem, and during the reading process of the storage area 101, as long as there is a change from high bit 1 to low bit 0 after the bad block, it indicates that the system is still running; when the running time exceeds the calibration time limit, the time limit identifier 104 is changed from high 1 to low 0, at this time, the function of the recorder for automatically calibrating the real-time clock is disabled, and the subsequent calibration enters a manual calibration mode;
for example, the following steps are carried out: the calibration error is specified to be 1 minute, the calibration time limit is 30 hours, and the length of the storage area 101 is 1807 bytes: the first 6 bytes represent the starting time of the recorder X years, X months, X days, X minutes and X seconds, and are written in the timestamp 102; each byte of the middle calibration zone 103 represents 1 minute; the last byte is the calibration time limit identification 104. The size of the memory area 101 is 6+30x 60+1, 1807 bytes.
Referring to fig. 2A-2B, when the recorder is started, all data bits in the storage area 101 are at high level 1, the first 6 bytes represent the starting time of the recorder X year X month X day X hour X minutes X seconds, and every time the system runs for one calibration error later, the corresponding calibration area 103 changes from high level 1 to low level 0, and when the running time of the recorder exceeds the calibration time limit, the time limit flag 104 also changes from high level 1 to low level 0, which represents that the calibration of the recorder is invalid.
For example, the following steps are carried out: all data of the storage area 101 are represented as 0xFF, and the first 6 bytes represent the start time of the recorder X year, X month, X day, X minute and X second; in the calibration area 103, each byte represents one minute, and each time the system runs for one minute, a 0xFF is written to be 0x00 in the calibration area 103, so that how many 0x00 in the calibration area 103 represent how many minutes the system runs, so that a time point can be obtained, the time point is compared with the system clock, if the error is within a specified calibration error range, the system clock is not required to be adjusted, if the error exceeds the specified range, the system clock is required to be adjusted, so that the real-time clock is more accurate, and the obtained patient data corresponds to the time height.
When the memory area 101 has a bad block or unreadable data bits, an or relationship is applied, as long as there is a change from high bit 1 to low bit 0 after the bad block of the calibration area 101, the system is still running, and only if there is no change in the data bits after running, the system is running. For example, one byte for one minute, the calibration area (103) runs to the nth byte, and no change occurs in the data bits following the nth byte, which results in a system running time of N minutes (note: the number of bytes running does not indicate the running time of the system), thus reducing the memory area 101 requirements and improving the accuracy of the recorder calibration.
Step two, design of calibration of the dynamic blood pressure recorder under different working states
Secondly, the recorder is in a continuous recording state, after each measurement, the next measurement interval is calculated,
the recorder starts the data transmission and,
thirdly, the recorder is in a data continuous transmission state, a calibration time interval (such as 5 minutes) is set,
the real-time clock calibration needs to be carried out on the recorder, when the real-time clock is calibrated, the time recorded by the timestamp is added with the running time period of the calibration area to obtain the time of the real-time clock, the time is compared with the system clock, and if the error between the time and the time exceeds the specified error, the system clock needs to be adjusted to achieve the purpose of real-time clock calibration.
Fourthly, the recorder automatically restarts to enter a recording state due to the complex electromagnetic environment,
the recorder is restarted due to the interference of electromagnetic compatibility on the transmission interface,
the software watchdog and the hardware watchdog are used for automatically restarting the recorder immediately after the recorder is halted, so that the normal work of the system and the reliability of the calibration function are ensured. After the recorder is started, the time of the real-time clock is obtained by adding the time recorded by the timestamp and the time period of the operation of the calibration area, the time is compared with the system clock, and if the error between the time and the time exceeds the specified error, the system clock is adjusted to achieve the purpose of calibrating the real-time clock.
When the recorder works, the recorder may be halted due to interference of a transmission interface or a complex electromagnetic environment, and software and hardware watchdog in the system ensures that the system is restarted to perform real-time clock calibration. When the recorder is continuously recording, after each measurement is finished, the time interval of the next measurement needs to be calculated, and at the moment, the real-time clock needs to be calibrated to ensure the accuracy of the real-time clock. In transmitting data, the calibration of the real-time clock is also performed each time data transmission is initiated. Or when the recorder is in a state of continuously transmitting data, the real-time clock needs to be correspondingly calibrated within a specified time interval, so that the error of the real-time clock is within the specified time, and the accuracy of the starting time and the ending time of the data transmission is ensured.
Claims (1)
1. A method for calibrating a real-time clock of a dynamic blood pressure recorder is characterized by comprising the following steps:
step one, design of real-time clock calibration storage area 101
The real time clock calibration storage area 101 is divided into 3 sections: a time stamp 102, a calibration area 103 and a time limit identifier 104, wherein the size of the storage area 101 is designed according to calibration errors and calibration time limits;
after the recorder is started, all data bits of the storage area 101 are in high order 1, and the starting time of the recorder is X years, X months, X days, X minutes and X seconds, which are expressed by the first six bytes and written in the time stamp 102;
during the calibration time limit, each time the recorder runs a calibration error, one byte in the calibration area 103 changes from high 1 to low 0; because the storage area 101 occasionally has a bad block or unreadable data bit, the calibration area 103 uses a plurality of data bits, and uses an or relationship to avoid the problem, and in the reading process of the storage area 101, as long as the value of the currently read word and byte is less than the maximum value of the word or byte, the system is indicated to normally operate, and the flag bit is effectively modified; when the running time exceeds the calibration time limit, the time limit identifier 104 is changed from high 1 to low 0, at this time, the function of the recorder for automatically calibrating the real-time clock is disabled, and the subsequent calibration enters a manual calibration mode;
step two, design of calibration of the dynamic blood pressure recorder under different working states
The recorder is in continuous recording state, after every measurement, the next measurement interval is calculated,
the recorder starts the data transmission and,
thirdly, the recorder is in a data continuous transmission state, a calibration time interval is set,
the real-time clock calibration needs to be carried out on the recorder, when the real-time clock is calibrated, the time recorded by the timestamp is added with the running time period of the calibration area to obtain the time of the real-time clock, the time is compared with the system clock, and if the error between the time and the time exceeds the specified error, the system clock needs to be adjusted to achieve the purpose of real-time clock calibration;
fourthly, the recorder automatically restarts to enter a recording state due to the complex electromagnetic environment,
the recorder is restarted due to the interference of electromagnetic compatibility on the transmission interface,
and fifthly, the recorder is automatically restarted immediately after being halted by the software watchdog and the hardware watchdog to ensure the normal work of the system and the reliability of the calibration function, the time of the real-time clock is obtained by adding the time recorded by the timestamp and the running time period of the calibration area after the recorder is started, the time is compared with the system clock, and if the error between the time and the time exceeds the specified error, the system clock is adjusted to achieve the purpose of calibrating the real-time clock.
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