DS5 Isolated Bipolar Constant Current Stimulator |
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This
new isolated stimulator is controlled by an analogue voltage input
which the DS5 translates into an isolated constant current
stimulus (up to ±50mA), precisely replicating the shape of the input
waveform. While It has been designed
for nerve excitability research, the DS5 should be of
interest to anyone wishing to control stimulation protocols via software/hardware
combinations capable of
producing a suitable input voltage waveform.
The
DS5 was developed in collaboration with Prof. Hugh Bostock (UCL,
London) and can be used with his QtracW software (see below) for nerve excitability research
studies. Nerve
Excitability workshops are being organized by Prof
Bostock at UCL.
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Major
Features Include:
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Up to ±50mA output from over ±100V compliance, in 3 output
ranges.
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Isolated constant current output proportional to an input
voltage applied via BNC connector.
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Compatible with a wide variety of data D/A interfaces and
software, including QtracW (see below).
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Safety features ensure patient protection. Certified
CE approved medical device.
- Output connection accessories,
including
plugs and cables are also available.
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QtracW Stimulation/Acquisition Software (for use with the
DS5)
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QtracW
is a flexible, stimulus response data acquisition program
with averaging and threshold tracking facilities, for
studies of human nerves in vivo and other
preparations. It is best suited when the excitability
or response varies slowly with time, either due to changes
in the stimulus parameters or to an externally initiated
treatment, and the data of primary interest are the changes
in selected parameters (threshold, amplitude, latency, etc.)
of the response with time. Response waveforms can also be
recorded, enabling the time course of additional response
parameters to be calculated after the recording is finished.
QtracW comprises separate stimulation and plotting programs,
QtracS and QtracP. QtracW is a multi-channel program,
in which the 'channels' (up to 16) may be associated with
different physical inputs and outputs, or with different
stimulation parameters or different operations on the
response waveform. Flexibility comes from the ability
to associate any combination of physical or operational
parameters with any channel.
QtracW
can be freely downloaded from the QtracW FTP site (login
details required) or from
here.
After 30 days evaluation the
QtracS functions will only be accessible via a password
which is provided once a license has been purchased from
Digitimer.
After
downloading the ZIP file to your PC, the contents should
be extracted to a temporary directory. Install by double clicking on
the SETUP.EXE file found in the
QtracInstall subdirectory, then double-click on
QTRACUPDATE.EXE in QtracUpdate folder. Further instructions
relating to setup are
given in the Readme.txt file and QtracW Manual.
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DS7A
& DS7AH High Voltage Constant Current Stimulators |
The
DS7A
provides up to 100mA constant current high voltage pulses of brief
duration for percutaneous stimulation during investigation
of the electrical activity of nerve and muscle tissue. The
output current is continuously variable over the range 0 to
100mA.
The
DS7AH allows currents up to 1A with a maximum pulse
duration limit of 200µs. This model is offered to overcome
the difficulties of stimulating deep peripheral nerves, or
large muscles such as the quadriceps with large area
electrodes. The DS7A or DS7AH can be triggered by
an external device such as our new DG2A
Train/Delay Generator. For applications that
require a higher output, we recommend our D185
MultiPulse (see below). The
DS7A & DS7AH are CE approved medical devices and have been cleared by the FDA for marketing within the
USA.
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Major
Features Include:
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Pulse durations from 50 microseconds to 2 milliseconds.
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100mA (DS7A) or 1A (DS7AH) constant current output from
400V.
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Flexible TTL compatible trigger options or front panel push
button.
- Output connection accessories,
including
plugs and cables are also available.
- Optional Special Modifications
include: Alternating Polarity Option (M288A) &
PSARP
Muscle Stimulator (M347) - please contact us for details.
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D185
MultiPulse Stimulator |
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Although
the D185 was designed for transcranial cortical stimulation
during intraoperative monitoring,
the brief high voltage output also
makes it suitable for nerve root stimulation during
differential diagnosis of peripheral nerve disorders such
as multifocal motor neuropathy and motor neuron
disease. The high voltage allows you to effectively
stimulate deep nerve roots as they exit the spinal column,
while the very short pulse duration minimizes patient
discomfort. The D185 is a CE approved medical device
and has been cleared by the FDA for marketing within the
USA.
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Major
Features Include:
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1000V maximum voltage output (set by user).
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1.5A maximum current output (LCD monitor).
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Risetime of 0.1A per microsecond.
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50µs pulse duration.
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1 to 9 pulses with user defined interpulse interval.
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NEW Reversible
output polarity switch.
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User defined trigger facilities permit integration with
popular EP or EMG recording equipment.
- Output connection accessories
for peripheral stimulation, including
plugs and cables and
electrode handles are also available. |
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