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EEG - ElectroEncephaloGraphy
|Uniport 1989-1991||home - top of the page -|
|In 1989-1991 I participated in designing a first
in Russia portable myograph. In fact it was a universal device (called
Uniport) with electro- and audio-stimulators and 2 channels of registration.
It could measure not only EMG, but also EP (Evoked Potentials), Audio EP,
and ECG (Cardiogram).
Our main team consisted of 3 people (look at photos on the left):
left to right:
|As you see, the device was very small and integrated
with a laptop computer (Toshiba with Intel 8080 CPU at 4 MHz). Although
small, Uniport was capable of helping doctors in ~95% of their diagnostic
We managed to make it small and effective (in comparison with prototypes which were the size of a table) by moving as much functionality as possible from hardware to software.
|While designing this device we had to solve some
interesting problems. For example, the device was capable of delivering
short pulses of electric current (up to 300 Volts) - and at the same time
we had to measure very small electrical signals from human body (microvolts).
This was difficult, because impulse was creating strong eletrical interference.
Especially because both amplifier and stimulator had to receive power from
the same power supply.
The power supply unit was by itself an interesting and challenging project. It had to be small and light, deliver very good electrical isolation accoring to medical standards (which is KVolts), enough power for computer and all electrical circuits - and ensure very low level of pulsation.
|Biola||home - top of the page -|
Biola produces and sells neurological equipment in Russia:
www.biola-photos.narod.ru - photos of different models
biola.netfirms.com/dl/Biola_eeg_english.doc - MS document in English
I highly recommend this equipment. It is small, portable, works with standard computers, has very good software (result of more than 10 years of development and perfecting it to satisfy customers' needs). It is built by European and internatinal standards (including safety standards). And the company is proud of being able to sell it at very low prices (starting at $1,500).
NeuroScope - paperless EEG
- 8 to 32 channels
- Prices start at $1600
- 5-year warranty
NeuroScope is a family of PC-based digital encephalographs. These compact units combine the benefits of a paperless EEG with record quality and the ease of use normally associated with paper-and-pen models.
There are three model lines of Neuroscopes:
- NS400 - the best (8 .. 32 channels)
- NS400P - portable (8 .. 24 channels)
- NS400A - the cheapest (8 or 16 channels). Even though it has fewer features than its bigger brothers, it retains everything necessary for routine clinical tests, at a price thats hard to believe.
All model lines offer exceptional quality and reliability, yet the price is several times lower than the competition.
|World Selection||home - top of the page -|
Uniport was probably the very first device of this sort in the whole
Since then many manufactures has built similar portable instruments:
- Neuroscan Medical Systems (Neurosoft)
- DELSYS EMG Products - Electrodes, Systems and Software
www.biomed.nicolet.com/ - Nicolet Biomedical
www.biomed.nicolet.com/products.htm - products
www.cadwell.com/ - Cadwell Laboratories
www.medtronicdantec.com/ - Medtronic (DANTEC)
webprod1.medtronic.com/ - Medtronic
www.medtronic.co.uk/dantec/accessories/ - Dantec electrodes, etc.
- Oxford Instruments Medical (UK, Medelec)
www.medtrading.com - Nihon Kohden
www.kohden.co.jp/intl - products
www.kohden.co.jp/intl/pmeb9100.html - portable notebook-based system
|Misc. Links||home - top of the page -|
- good list of links
www.neuroguide.com/comres_2.html - Neuro Commercial Resources (Links)
faculty.washington.edu/chudler/comm.html - Commercial Neuroscience Resources
www.bhs.mq.edu.au/.../MEG+Optical - Magnetoencephalogram
Some neurophysiology equipment manufactures:
www.axon.com/ - Axon Instruments
www.axonsystems.com/ - Axon Systems
www.blsc.com/index.htm - Biologic Systems
www.cadwell.com - Cadwell Laboratories
www.compumedics.com.au - Compumedics
www.digitimer.com/ - Digitimer
www.emgassistant.com/ - EMG Assistant
www.gereonics.com/main.html - Gereonics
www.grass-telefactor.com/ - Grass Instruments
www.magstim.com/ - MagStim Company
www.medelec.com/ - Medelec Ltd
www.medtronicdantec.com/ - Medtronic Dantec
www.moberg.com/ - Moberg Multimedia
www.nci.com/ - Network Concepts, Inc.
www.neuro.com/ - Neurosoft
www.kohden.co.jp/en/en/pneufram.html - Nihon Kohden
www.nicoletbiomedical.com/ - Nicolet Biomedical
www.physiometrix.com/ - Physiometrix
www.reflexsystems.com/reflex001.htm - Reflex Systems
www.rochestermed.com/ - Rochester Electro-Medical
www.stellate.com/ - Stellate Systems
www.oxford-instruments.com/medical/index.cfm?page=/medical/products/teca1.cfm - TECA - Neurophysiology
www.grass-telefactor.com/ - Telefactor
www.wrmed.com/ - WR Medical
www.xltek.com/xlwebv2/default.htm - XLTEK
www.xomed.com - XOMED
Some Australian Agents also have a Web site:
www.medtel.com.au/ - Medtel Pty Ltd
ourworld.compuserve.com/homepages/swiss_datalogic/ - Swiss Datalogic
www1.tpgi.com.au/users/blaineg/surgsys.htm - Surgicon Systems
Other misc. links:
www.modulusa.net/Full%20Prod%203.html - paper for equipment
www.electrodestore.com/ - The Electrode Store (since 1975)
www.teleemg.com - how to do tests, EMG & Nerve Conductions Homepage
www.aset.org/ - The American Society of Electroneurodiagnostic Technologists
www.aaem.net/ - American Association of Electrodiagnostic Medicine
www.neurophys.com/ - links
www.teleemg.com/Chapters/tblcnt.htm - EMG manual
www.elsevier.nl/homepage/sah/ifcn/ - The IFCN - International Federation of Clinical Neurophysiology links 50 National Societies of clinical neurophysiology and related neurological sciences.
medplanet.com/ - medical equipment
www.dmoz.org/Health/Medicine/Medical_Specialties/Neurology/ - Listing on Open Directory Project
www.aetc.ca/Links/links.html - links
|Oscilloscopes||home - top of the page -|
Oscilloscopes today became small, hand-held, battery operated.
They look and feel like enhanced testers (DMM - digital multimeters).
They usually have some math. processing (curve fitting, etc.) as well.
Here are some - www.exphil.com/Products/handheldoscilloscopes.asp
Tektronix TDS200 Series.
Fluke ScopeMeter® 190 Series
mcmelectronics.com model 72-6640
single channel 2MHz Digi-Scope is only $300.
(size 95x50x210 mm)
The price vary:
$300 - for a 2 MHz model
$1,200 - for a 20 MHz model
$2,000 - for 60 MHz
$3,000 - for 200 MHz
What to expect:
Power - NiCd rechargeable battery pack with AC adapter (both included).
Battery Life - Approx. 2 hours from full charge.
Display - Backlit LCD 320 x 240.
Horizontal: 2 ns to 50 s/div, Record Length - 2500 points.
Vertical: 5 mV to 50 V/div (to 500 V/div with 10X probe), Vertical Resolution - 8-Bits (256 points).
All trigger modes + add/subtract, etc. - all you wouldexpect from digital oscilloscope.
All Volt/Amp/Ohm measurements as of high-quality DMM