|
NEW
— Constant Current, Bi-phasic Stimulator
From the world
renowned manufacturer of research stimulators, the new Grass
S12X Cortical Stimulator is FDA listed for clinical
use. The S12X is a constant current,
bi-phasic stimulator intended for cortical stimulation mapping to
aid in cortical resection procedures. Stimulation can be via a traditional
hand-held electrode probe
for intraoperative stimulation, or via intracranial electrodes using
the Grass ESAx Electrode Switching Array option in conjunction with
Grass Technologies’ Beehive Video/EEG monitoring systems.
Using the S12X touch-panel screen, the user can select any of up
to 128 electrodes for delivery of stimulation pulses.
| Cortical
Stimulator Features: |
| •
|
Bi-phasic,
Constant Current stimulation up to 15 mA |
| •
|
Real-time
display of delivered current, measured voltage, and electrode
impedance |
| •
|
Intuitive
Touch-screen LCD Display, including on-screen electrode selection
|
| •
|
Direct
Connect up to 128 channels for electrode selection and EEG recording
|
| •
|
Import
electrode names from Beehive TWin recording montages |
| •
|
Logging
of stimulation parameters to a text file for record keeping
|
| •
|
Hand-held
controller for remote start/stop stimulation controls |
| •
|
Inherent
safety/shutdown features to prevent over stimulation |
The
ESAx Electrode Switching Array interfaces to the S12X output
for delivery of stimulation pulses via intracranial electrodes.
The ESAx has appropriate connectors for connecting EEG electrode
jack boxes and EEG Amplifiers (Grass Technologies’ CTE, AURA,
or AURA-LTM64 amplifiers). Each ESAx handles 64 channels.
| Electrode
Switching Array Features: |
| •
|
Optical
relays powered by the isolated power supply of the S12X |
| •
|
Electrodes
for stimulation are selected on the S12X touch-panel display
|
| •
|
ESAx
connects any combination of 64 electrodes to the plus and minus
stimulus output of the S12X |
| •
|
ESAx
disconnects the EEG amplifiers associated with the selected
electrodes to ensure all current is delivered to the electrodes,
to prevent saturation of amplifiers, and for faster amplifier
(EEG) recovery when the stimulation train stops |
| •
|
Two
ESAx switching units can be daisy chained for up to 128 channels |
When using the S12X Stimulator with the ESAx option,
all of the patient’s electrodes and the Beehive recording
system’s amplifiers remain connected, and EEG waveforms are
displayed and recorded. Once electrodes are selected on the S12X
electrode selection touch-screen, the Channel Check function can
be activated. During channel check a “buzz” signal is
introduced into the EEG amplifiers corresponding to the electrodes
selected. This provides a visual verification of selected channels
on the EEG waveform display. Stimulation pulses can then be delivered
to the selected electrodes.
| SPECIFICATIONS |
| Stimulation
Waveform |
| Pulse
Type |
|
Constant
current, bi-phasic |
| Pulse
Amplitude |
|
0.2
to 15 mA in 17 steps with fine adjustment, except at 2000 µsec
when current is limited to 10 mA |
| Amplitude
Accuracy |
|
5%
or 0.02 mA, whichever is greater |
| Pulse
Duration |
|
0.1
to 2.0 msec in 7 steps |
| Frequency
Range |
|
2
to 100 Hz in 7 steps, except at pulse widths of 1000 or 2000
µsec when the frequency is limited to 50 Hz |
| Time
Base Accuracy |
|
0.01%
or pulse width,
0.1% for repetition rate |
| Load
Impedance |
|
Maintain
current accuracy from 100 to 2000 ohms |
| Leading
Pulse Polarity |
|
Selectable
positive, negative, or alternating on successive pulses |
| Maximum
Slew |
|
30 µsec
(measures
less than 20 µsec) |
| Maximum
Droop |
|
5%
of selectable amplitude |
| Train
Duration |
|
0.2
to 20 sec in 7 steps |
| Power |
|
Medical
Grade Isolated Power Supply |
| Physical
Size |
|
13.25"
W x 6.5" H x 7" D
(33.7 cm x 16.5 cm x 17.8 cm) |
| Weight |
|
5
lbs. (2.25 kg) |
| Regulatory |
|
CE
mark pending |
|
| SPECIFICATIONS |
| Additional
Features |
| Impedance
Test |
|
Checks
load impedance |
| Isolated
Power Out |
|
Special
connection, only for use with Grass Technologies ESAx Electrode
Switch Array Option |
| ESAx
Specifications |
| Channels
per ESAx |
|
64 |
Maximum
Number
of ESAx per S12X |
|
2 |
| Power |
|
Isolated
low voltage 5 VDC supplied by S12X |
| Physical
Size |
|
1”
H x 8.5” W x 6.5” D
(2.54 cm x 21.6 cm x 16.5 cm) |
| Weight |
|
1
lb. 10 oz. (0.74 kg) |
| Manual
Probe Option |
| Probe
Length |
|
5” (13
cm) |
| Probe
Construction |
|
Delrin,
covered with Polyolefin tubing |
| Probe
Cable |
|
Twisted
pair, 12 feet (3.6 m) |
| Electrode
Construction |
|
2
mm diameter, polished, gold-plated balls |
| Electrode
Gap |
|
5
mm (adjustable) |
| ORDERING
INFORMATION |
| Model
S12X |
|
Stimulator
including manual and power supply
|
| Options: |
| Model
ESAx-1 |
|
Electrode
Switch Array supports channels 1-64 |
| Model
ESAx-2 |
|
Electrode
Switch Array supports channels 65-128 |
| Model
F-BSE1 |
|
Manual
Probe |
Specifications
subject to change without notice
|
|
Caution:
Federal Law (U.S.A.) restricts these devices to sale by or the order of
a physician.
Caution: It is strongly recommended that users be trained
in the functional use of the S12X Cortical Stimulator and the ESAx switch
box prior to initial use.
Caution: When in use, the S12X Cortical Stimulator must
be attended at all times by medical professional trained in cortical stimulation.
Warning: When using grid or strip electrodes, it is recommended
that an image scan be performed to confirm the electrodes are anatomically
positioned properly on the patient.
Warning: The S12X Cortical Stimulator and ESAx option should
only be used with grid, strip, and depth cortical electrodes
that are FDA cleared for stimulation AND recording.
Warning: Electrodes used with the S12X and ESAx option
should use lead wires terminating in FDA mandated, female touch
proof safety 1.5mm sockets. |
Channel
Check function activated. In the example above, G05 and G15 electrodes
are selected for stimulation. A “buzz” signal is shown
in the corresponding EEG channels on the Beehive waveform display.
