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No. 2D730-148E*O
8.
PHYSIO MODULE
(1)
Outline
This module detects physiological signals (ECG, respiration, PCG, and pulse) using the ECG
cable and sensors and transfers the data to the diagnostic ultrasound system (hereinafter
referred to as "system").
Line voltage
ECG (electrocardiogram)
ICH (IM RESP (respiration)
ICH)
RESP (respiration)
ICH
DC IN (external inpuffECG)
ICH (line voltage:
f2.5 V)
PCG (phonocardiogram)
ICH
Pulse (pulse)
ICH
AUX (external input)
1 CH (line voltage:
f2.5 V)
(2)
Functions
The following functions are provided.
(4
(b)
(cl
(4
(e)
Amplification
of the electronic potential induced by the R and F electrodes of the ECG
cable attached on the body surface and transfer of the data to the system in order to
display the ECG on the monitor.
Detection of the QRS waveforms
and transfer of the
signals to the system.
Measurement
of the electrical resistance in the chest with an
alternating current (between electrodes
R and F) and transfer of the data to the system in
order to monitor the respiration cycle.
Transfer of respiration data from the thermistor sensor attached to the nasal cavity to the
system in order to display the respiration cycle on the monitor.
Transfer of data from the PCG sensor attached to the chest to the system in order to
display PCG waveforms
on the monitor.
Transfer of data from the waveform sensor attached to the carotid artery and apex of the
heart to the system in order to display pulse waveforms on the monitor.
Transfer of input signals (physiological signals) from two external medical devices to the
system.
The input signal from the one of the external medical devices can be output to the system
as a trigger signal for imaging.
(3)
Operations
This module consists of the amplifier section, power supply section, and digital section.
The
module is connected to the system via a cable and a 15pin D-sub connector.
The module
receives a 12-V power supply and waveform request command from the system and performs
waveform (such as ECG and PCG) output to the system.
The amplifier which amplifies the ECG, respiration, PCG, pulse, and external device signals is
set inside this module.
After importing the A/D values, the module calculates the sensitivity
and position using the single-chip CPU inside the A/D converter and stores them in the RAM
as digital values.
QRS detection is performed by the hardware.
The waveform data is output
via a serial interface at a transmission
rate of 312.5 Kbaud when a waveform request
command
is received from the system.
QRS detection signals are output by setting QRS flags
in the detection signals and waveform data (two series). Also, sensor connector
insertion/removal
information is transferred to the system.
For the ECG connector, lead
ON/OFF information,
which indicates whether or not the three electrodes are attached to the
patient properly, is output.
8-l
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