Huntleigh MD200 Mode D'emploi page 4

OPERATING INSTRUCTIONS
VASCULAR
The MD200 will select vascular mode when a
vascular probe is connected to the control unit.
In this mode, bi-directional blood flow rate and
direction are indicated on bar graphs (4 levels in
each direction) and blood flow is audible in the
loudspeaker. Flow towards the probe is in the
left speaker and flow away from the probe is in
the right speaker. The same applies to the
stereo headphones when used. Probe
frequency is displayed together with the bar
graphs.
Clinical Use
Apply a liberal amount of gel on the site to be
examined. Place the probe at 45° to the skin
surface over the vessel to be examined. Adjust
the position of the probe to obtain the loudest
audio signal. High pitched pulsatile sounds are
emitted from arteries while veins emit a non-
pulsatile sound similar to a rushing wind.
For best results, keep the probe as still as
possible once the optimum position has been
found. Adjust the audio volume as required.
Waveform Recording
Separated waveform outputs are provided in
analogue and digital formats.
Analogue signals are provided for connection to
a single channel chart recorder giving a
combined bi-directional waveform, or to a dual
channel recorder for separate forward and
reverse flow waveforms. (Pin-out details on
request).
Digital signals are provided via the RS232 port
for printing separate waveforms on a Dopplex
Printa II or for communicating with Dopplex
Reporter software package.
Cal Function
The baseline and sensitivity of the chart
recorder can be set up using the Cal function.
This generates a zero velocity baseline and a
sequence of bi-directional pulses as shown
below:
Cal Pulses
OPERATING INSTRUCTIONS
VASCULAR
Gain Control
To cope with the wide variety of signals
detectable using your MD200, a gain control
allows you to optimise the bar-graph display
and increase the height of the waveforms.
Using the Mode button on the MD200, gain
can be set to x1, x2, x4, x8.
Connection to Printa II
Hard copy printing is automatically selected
when the plug of the interface buffer box is
inserted into the RS232 socket on the top
panel of the MD200. Printing is then initiated
by using the Start/Stop button.
Note: Do not switch off the MD200
during printing as this will erase
any information stored in the
buffer box.
Connection to Software
The MD200 can be connected to the
Dopplex Reporter Software Package, via the
RS232 interface. The Dopplex Reporter
software package is available as an
accessory. Communicating is then initiated
by using the Start/Stop button.
Probes
Six probes are available for vascular
examinations:
VP4HS
VP5HS
VP8HS
VP10HS 10MHz ±1% for
EZ8
IOP8
4
4MHz ±1% for deep
lying vessels
5MHz ±1% for deep
lying vessels and
oedematous limbs
8MHz ±1% for peripheral
vessels
specialist superficial
applications.
8MHZ ±1% "Widebeam"
for peripheral vessels.
8MHz +-1% for
Intraoperative use.