Principles of Operation
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monitor can store 1 group of user default configuration for each patient type.
Storage of trend data: In the full configuration, the non-volatile data include trend data of all
parameters: systolic pressure, mean pressure, diastolic pressure, PR, SpO
2
, measurement
time and patient ID.
2.3.3 Module Software
The module software implements the upper-level communication protocol through the
communication port.
2.3.4 Upgrade Software
The upgrade software implements, through the Ethernet and PC, the online upgrade of the
system software of the monitor and module software.
The upgrade software package includes the bootstrap and PC upgrade software. The
bootstrap, which takes the main board as the platform, provides the online upgrade functions
of system software and module software as well as the system function configuration. The PC
upgrade software, which takes the PC as the platform, communicates with the monitor through
the Ethernet, and provides operators with the upgrade/configuration UI.
The FPGA upgrade software is controlled by the main board.
The upgrade software realizes the multi-language downloading and upgrade function.
2.3.5 Printer Software
The printer software, which takes the PC as the platform, receives data output from the monitor,
and implements the data display, storage and printing.
2.4 System Parameters
2.4.1 NIBP
The NIBP is measured based on the pulse vibration principle. Inflate the cuff which is on the
forearm till the cuff pressure blocks the arterial blood, and then deflate the cuff according to a
specified algorithm. While the cuff pressure is decreasing, the arterial blood has pulses, which
are sensed by the pressure transducer in the cuff. Consequently, the pressure transducer,
connected with the windpipe of the cuff, generates a pulsation signal. Then, the pulsation
signal is filtered by a high-pass filter (about 1Hz), amplified, converted to the digital signal by
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