生物反馈仪说明书

Dual SEMG

MYOTRAC INFINITI

The Manufacturer:

Product Name:

Product #:

Device Name:

Device #:

MyoTrac Infiniti™ Dual SEMG User Guide

Thought Technology Ltd.

2180 Belgrave Avenue

Montreal, Quebec, Canada

H4A 2L8

MyoTrac Infiniti System

T9800

MyoTrac Infiniti Encoder

SA9800

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Type BF Equipment

Internally powered equipment

Continuous operation

Read Instruction Manual

The pins of the connectors identified with the ESD warning symbol should not be touched

unless ESB precautionary procedures are used.

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CAUTION

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US Federal Law restricts this device to sale by, or on order of, a physician or any other

practitioner licensed by the law of the state in which he or she practices to use or order the

use of this device.

Do not operate Active Sensors within 10 feet of an operating cellular phone, similar radio

transmitting device, other powerful radio interference producing sources such as arc

welders, radio thermal treatment equipment, x-ray machines, or any other equipment that

produces electrical sparks. Portable and mobile RF communication equipment can affect

this equipment.

With the MyoTrac Infiniti Encoder SA9800 use only with supplied power supply. GlobTek

Part Number WR92B2500LF9P-Y-MED (WR95/WR93/WR97) or GS889

The PC used with MyoTrac Infiniti must be placed outside the patient/client environment

(more than 3 meters or 10 feet) or the PC must comply with EN60601-1 (system safety).

After use, the Batteries or the Battery pack must be disposed of in accordance with local,

state and federal regulations and laws.

After use, the Disposable Electrodes may be a biohazard. Handle, and when applicable,

dispose of these materials in accordance with accepted medical practice and any applicable

local, state and federal laws and regulations.

Reusable electrodes present a potential risk of cross-infection especially when used on

abraded skin, unless they are restricted to a single patient or sterilized between patients. If

sterilizing electrodes, employ only gas sterilization.

Radiated radio frequency electromagnetic fields can cause performance degradation in the

MyoScan-Pro EMG sensor. In the worst case, an RF field strength of 22mV/M can cause

an increase of 1μV in the signal reading from a MyoScan-Pro sensor. Be sure to keep in

mind that a very relaxed muscle should provide an EMG reading of approximately 1-3μV.

This device is capable of generating current densities exceeding s./cm² this may

require special attention of the operator.

Avoid accidental contact between connected but unused applied parts and other conductive

parts including those connected to protective earth.

Explosion Hazard; Do not use in the presence of a flammable anesthetic mixture with air, or

with Oxygen or Nitrous Oxide.

Not to be immersed in water.

Take care in arranging patient and sensor cables to avoid risk of patient entanglement or

strangulation.

The operator is responsible for ensuring the safety of any devices controlled or triggered by

Infiniti equipment or software, or by any software or hardware receiving data from Infiniti

equipment. Infiniti equipment must not be configured or connected in such a way that

failure in its data acquisition, processing or control functions can trigger patient feedback

stimulus that poses an unacceptable level of risk.

Use of any equipment in a biofeedback or stimulation context should be immediately

terminated upon any sign of treatment-related distress or discomfort.

Not to be connected to a patient undergoing MRI, Electro surgery or defibrillation.

Not for use with patients with undiagnosed pain conditions.

Only use the unit for which it was prescribed.

Do not immerse the unit in water or any other liquid substance.

Do not use if you have symptoms of bladder infection.

Do not use with diminished mental capacity or physical competence limiting the use of the

device.

WARNING

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MyoTrac Infiniti™ Dual SEMG User Guide 3

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Caution should be used for patients with suspected or diagnosed heart problems.

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Caution should be used for patients with suspected or diagnosed epilepsy.

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Electrode placement and stimulation settings should be based on the guidance of the

prescribing practitioner.

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If damage is evident of the unit or accessories, discontinue use and contact your supplier

for further information on repair.

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The system should not be used adjacent to or stacked with other equipment, if used

adjacent or stacked the unit should be observed to verify normal operation in the

configuration in which it will be used.

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Use of accessories, transducers or cables other than those specified by Thought

Technology ltd may result in increased emissions or decreased immunity of the equipment

to electromagnetic energy.

ATTENTION

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Sensors and equipment damaged by static electricity are not covered under warranty. To

prevent static discharge from damaging the sensor and/or encoders, use anti-static mats or

sprays in your working area. A humidifier may also be used to prevent static environments

by conditioning hot, dry air. It is recommended that all staff involved with the unit receive an

explanation of the ESD symbol and the precautions described above as a minimum.

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Do not apply any electrode gel or equivalent directly on the sensor snaps. Always use

electrodes as a medium between the sensor and the client.

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Not for diagnostic purposes, not defibrillator proof, not for critical patient monitoring.

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To prevent voiding warranty by breaking connector pins, carefully align white guiding dot on

sensor plug with slot on sensor input.

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Make sure to remove electrodes from sensor snaps immediately after use.

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Do not plug third party sensors directly into instrument inputs. Plug only Thought

Technology Active Sensor cable connectors into instrument inputs. All electrodes and third

party sensors must be connected to active sensors, either directly or through an adapter.

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Remove batteries when the device is not being used for an extended period of time. Please

dispose of battery following local regulations.

INTENDED PURPOSE

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Biofeedback, Relaxation & Muscle Re-Education purposes

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Relaxation of muscle spasms

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Prevention or retardation of disuse atrophy

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Increasing local blood circulation

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Muscle re-education

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Maintaining or increasing range of motion

NOTE

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No preventative inspections required; maintenance must be performed by qualified personnel.

Factory re-calibration can be requested.

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The supplier will make available, upon request, circuit diagrams, component parts lists and

description or other information required for the repair of product by qualified personnel.

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The operator must be familiar with typical characteristics of signals acquired by this

equipment, and be able to detect anomalies in the acquired signal that could interfere with

treatment effectiveness. Depending on the importance of signal integrity, it may be advisable

to continuously monitor the raw signals, in time and/or frequency domain, while the device is

being used for biofeedback or other purposes. If anomalies are observed on acquired signals,

and if you suspect a problem with electromagnetic interference, contact Thought Technology

for a technical note on identification and remediation.

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This product conforms to standards EN60601-1, EN60601-2-10 and EN60601-2-40; some

encoder labeling may indicate superceded standards.

MAINTENANCE AND CALIBRATION

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Wipe encoder with a clean cloth

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Factory testing and calibration ensure equipment accuracy and frequency response. Contact

Thought Technology for factory re-calibration if necessary.

STORAGE

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Store in its original case at up to 90% humidity / 30C°

TRANSPORTATION

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Transport in its original case

Manual # SA9814 Rev 4

MyoTrac Infiniti™ Dual SEMG User Guide 4

Guidance and manufacturer’s declaration – electromagnetic immunity

The MyoTrac Infiniti is intended for use in the electromagnetic environment specified below. The customer or the

user of the MyoTrac Infiniti should assure that it is used in such an environment, and that precautions regarding

that environment are heeded.

Immunity test IEC 60601 Compliance level Electromagnetic environment –

test level guidance

Electrostatic

±6 kV contact ±6 kV contact

Floors should be wood, concrete or

discharge (ESD)

ceramic tile. If floors are covered with

±8 kV air

synthetic material, the relative humidity

IEC 61000-4-2

±8 kV air

should be at least 30 %.

Electrical fast

±2 kV for power ±2 kV for power

Mains power quality should be that of a

transient/burst

supply lines supply lines

typical commercial or hospital

IEC 61000-4-4

±1 kV for input/output

environment.

±1 kV for input/output lines

lines

Surge

±1 kV differential ±1 kV differential

Mains power quality should be that of a

mode mode

typical commercial or hospital

IEC 61000-4-5

±2 kV common mode

environment.

±2 kV common mode

Voltage dips, short

<5 % UT

<5 % UT

Mains power quality should be that of a

interruptions and

(>95 % dip in UT) (>95 % dip in UT)

typical commercial or hospital

voltage variations

for 0,5 cycle for 0,5 cycle

environment. If the user of the

on power supply

MyoTrac Infiniti requires

input lines

40 % UT

40 % UT

continued operation during power

(60 % dip in UT) (60 % dip in UT)

mains interruptions, it is recommended

IEC 61000-4-11

for 5 cycles for 5 cycles

that the MyoTrac Infiniti be

powered from an uninterruptible power

70 % UT

70 % UT

supply or a battery.

(30 % dip in UT) (30 % dip in UT)

for 25 cycles for 25 cycles

<5 % UT

<5 % UT

(>95 % dip in UT) (>95 % dip in UT)

for 5 sec for 5 sec

Power frequency 3 A/m 3 A/m Power frequency magnetic fields

(50/60 Hz) should be at levels characteristic of a

magnetic field typical location in a typical commercial

IEC 61000-4-8 or hospital environment.

NOTE UT

is mains voltage prior to application of the test level.

MyoTrac Infiniti™ Dual SEMG User Guide 5

Guidance and manufacturer’s declaration – electromagnetic immunity

The MyoTrac Infiniti is intended for use in the electromagnetic environment specified below. The customer or the user of

the MyoTrac Infiniti should assure that it is used in such an environment.

Immunity test IEC 60601 test level Compliance Electromagnetic environment – guidance

level

Portable and mobile RF communications equipment

should be used no closer to any part of the

MyoTrac Infiniti, including cables, than the

recommended separation distance calculated from

the equation applicable to the frequency of the

transmitter.

Recommended separation distance

Conducted RF 3 Vrms 3 Vrms

d=1.2P 80 MHz to 800 MHz

IEC 61000-4-6 150 kHz to 80 MHz 150 kHz to 80

MHz

Radiated RF 3 V/m 3 V/m

d=1.2P 80 MHz to 800 MHz

IEC 61000-4-3 80 MHz to 2,5 GHz 80 MHz to 2,5

GHz

d=2.3P 800 MHz to 2.5GHz

where P is the maximum output power rating of the

transmitter in watts (W) according to the transmitter

manufacturer and d is the recommended separation

distance in metres (m).

Field strengths from fixed RF transmitters, as deter-amined by an electromagnetic site survey, should be

less than the compliance level in each frequency

brange.

Interference may occur in the vicinity of equipment

marked with the following symbol:

NOTE 1 At 80 MHz and 800 MHz, the higher frequency range applies.

NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption

and reflection from structures, objects and people.

a Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land

mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted theoretically with

accuracy. To assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should

be considered. If the measured field strength in the location in which the MyoTrac Infiniti is used exceeds the applicable

RF compliance level above, the MyoTrac Infiniti should be observed to verify normal operation. If abnormal performance is

observed, additional measures may be necessary, such as reorienting or relocating the MyoTrac Infiniti.

b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than [V1] V/m.

MyoTrac Infiniti™ Dual SEMG User Guide 6

Recommended separation distances between

portable and mobile RF communications equipment and the MyoTrac Infiniti

The MyoTrac Infiniti is intended for use in an electromagnetic environment in which radiated RF disturbances

are controlled. The customer or the user of the MyoTrac Infiniti can help prevent electromagnetic interference by

maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the

MyoTrac Infiniti as recommended below, according to the maximum output power of the communications

equipment.

Rated maximum output Separation distance according to frequency of transmitter

power of transmitter

150 kHz to 80 MHz 80 MHz to 800 MHz 800 MHz to 2,5 GHz

W

d=1.2P

d=1.2P

d=2.3P

0,01 0.12 0.12 0.23

0,1 0.38 0.38 0.73

1 1.2 1.2 2.3

10 3.8 3.8 7.3

100 12 12 23

For transmitters rated at a maximum output power not listed above, the recommended separation distance d in

metres (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the

maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.

NOTE 1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.

NOTE 2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and

reflection from structures, objects and people.

Guidance and manufacturer’s declaration – electromagnetic emissions

The MyoTrac Infiniti is intended for use in the electromagnetic environment specified below. The customer or the user of

the MyoTrac Infiniti should assure that it is used in such an environment.

Emissions test Compliance Electromagnetic environment – guidance

RF emissions Group 1 The MyoTrac Infiniti uses RF energy only for its internal function.

CISPR 11 Therefore, its RF emissions are very low and are not likely to

cause any interference in nearby electronic equipment.

RF emissions Class B

The MyoTrac Infiniti is suitable for use in all establishments,

CISPR 11

including domestic establishments and those directly connected to

Harmonic emissions Not applicable

the public low-voltage power supply network that supplies

IEC 61000-3-2

buildings used for domestic purposes.

Voltage fluctuations/ Not applicable

flicker emissions

IEC 61000-3-3

MyoTrac Infiniti™ Dual SEMG User Guide 7

Table of Contents

About 9

10

Introduction to your MYOTRAC INFINITI™ Dual 10

11

MyoTrac 12

Connection to 15

Connection to 19

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SEMG sessions on your MYOTRAC INFINITI™ Dual 25

Open 25

Script 27

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Data Management on your MYOTRAC INFINITI™ Dual .28

MyoTrac .29

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Display Options on your MYOTRAC INFINITI™ Dual 30

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Flow on your MYOTRAC INFINITI™ Dual .34

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Technical Support and 36

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Product Numbers & .37

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39

MyoTrac Infiniti Hardware 44

MyoTrac Infiniti™ Dual SEMG User Guide 8

About This Guide

Welcome to the MYOTRAC INFINITI™ encoder. This guide is designed to help you get up and

running quickly with your new encoder. It will describe the operation of the encoder, and how it

interfaces to the host personal computer (PC).

It walks you through:

• Physical Operation of the encoder.

• EMG sessions.

• Data management.

• Display options.

After you have become familiar with the key concepts of your new encoder, you can use the rest of

this guide as a reference for less common tasks, and also as a source of information if you have

problems operating it.

MyoTrac Infiniti™ Dual SEMG User Guide 9

Chapter 1

Introduction to your MYOTRAC INFINITI™ Dual

SEMG Encoder

This chapter explains the physical interface with the MyoTrac Infiniti Encoder, how to use it for the

first time, and how to transfer data to the host PC.

Getting to know your MyoTrac Infiniti Dual SEMG Encoder

What is a MyoTrac Infiniti Dual SEMG Encoder?

The MyoTrac Infiniti is the cutting edge in handheld, dual channel Surface Electromyography

(SEMG). With it you will be able to deliver targeted and customized treatment directly to the client’s

clinically relevant areas.

A simple first approach has been adopted in the design of the MyoTrac Infiniti to make it as easy

and fast as possible to get the clinical results desired from this powerful device.

Customizing the MyoTrac Infiniti to your clinical needs couldn’t be easier; all users input is directed

through a series of intuitive and guided screens using touch screen technology.

The partnership of the MyoTrac Infiniti with the BioGraph Infiniti PC software enhances yet further

the power and flexibility of the MyoTrac Infiniti. This link enables you to transfer session data to the

PC for further viewing, analysis and reporting, in real time or post session.

MyoTrac Infiniti™ Dual SEMG User Guide 10

System Requirements

To install the BioGraph Infiniti software, your computer system must meet or exceed the following

requirements.

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IBM PC compatible

(Intel/Pentium/Celeron family or AMD

K6/Athlon/Duron family, CPU P4 speed 3

GHz or higher), Desktop or Laptop with

two monitor capability

Windows 2000/XP Professional or Home

edition.

50 - 60 gigabytes hard disk space for

video recording and processing. (The

software needs 2.5 gigabytes to install

and run on available hard drive space)

Memory, 512 MB of RAM or more

CD ROM or DVD drive

SVGA graphic card (1024 x 768) or higher

resolution adapter & monitor

32 bit Sound Blaster compatible sound

card & speakers

1 to 4 USB ports, depending on the

desired number of MyoTrac Infiniti

encoders

Mouse or compatible pointing device

MS Word 97 or higher (for printing

purposes)

Compact Flash Reader (For use with

compact flash card only)

Webcam 30 frames per second (for video

purposes only)

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IBM PC compatible

(Intel/Pentium/Celeron family or AMD

K6/Athlon/Duron family, CPU P3

speed 1.8 GHz), Desktop or Laptop

Windows 2000/XP Professional or

Home edition.

10 - 20 gigabytes hard disk space

(The software needs 2.5 gigabytes to

install and run on available hard drive

space)

Memory, 256 MB of RAM or more

CD ROM or DVD drive

SVGA graphic card (1024 x 768) or

higher resolution adapter & monitor

16 Bit Sound Blaster compatible

sound card & speakers

1 to 4 USB ports, depending on the

desired number of MyoTrac Infiniti

encoders

Mouse or compatible pointing device

Word 97 or higher (for printing

purposes)

NOTE: When using certain more complex

screens, you must adhere to the

Recommended Computer Requirements.

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NOTE: For most recent computer

requirements contact Thought Technology

Ltd for MAR473

Update information

Periodically updates may become available for the BioGraph Infiniti software and for the MyoTrac

Infiniti Hardware. Please contact your local distributor or visit our website

for further information on how to obtain updates.

MyoTrac Infiniti™ Dual SEMG User Guide 11

MyoTrac Infiniti Components

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Compact Flash for increased memory capacity and one method for transfer of data to the PC.

USB for real time transfer of data to the PC.

Touch screen enables graphically guided navigation through the software.

Rugged Ergonomic Case, easy to hold or attach to the subject and will withstand the rigors of

daily use.

Battery Charging jack for wall connection enables fast built-in battery charging.

Headphone Jack for stereo sound feedback (or use the built-in speaker).

Push button On/Off switch to prevent accidental switching.

2 Channels of Surface EMG.

MyoTrac Infiniti™ Dual SEMG User Guide 12

Power

There are three basic methods to power the MyoTrac Infiniti unit: Inserting batteries into the battery

compartment of the unit, plugging it into the wall using the supplied AC adapter, or plugging it into a

powered up computer using a USB cable.

The MyoTrac Infiniti is available with battery charging capabilities. It will work with four standard

Alkaline AAA batteries available in all consumer electrical stores. It is also possible to run the unit

on removable, externally rechargeable batteries. A rechargeable battery pack is supplied with the

MyoTrac Infiniti and can be charged while still inside the unit.

Note: When changing batteries it is recommended to plug the unit into external power, either USB

or wall transformer so that data is not lost. Failure to supply external power will result in data and

script loss.

The battery compartment cover slides open by pushing up using the notch provided. Place four

AAA batteries in the slots, observing the polarity as illustrated. Please note that a diagram of the

correct battery polarity is embossed on the inside surface of the compartment.

Alternatively it is possible to use a rechargeable battery pack (Thought Technology Part Number

MI1028). This battery pack is plugged into the connector in the battery compartment marked

BATT. The pack then fits into the normal battery area. Note: only use battery packs from Thought

Technology or authorized representative, as use of other battery packs will damage the device.

A wall mounted AC power adapter, supplied with the MyoTrac Infiniti, is used to connect the unit to

an electrical outlet. This can be used in conjunction with the batteries or without.

The unit can also be powered from the computer via the USB cable. The cable is connected to the

unit on one side and on the other side to the USB port of the computer. This can be used in

conjunction with the batteries or without.

Charging the Batteries

MyoTrac Infiniti™ Dual SEMG User Guide 13

Note: exact power supply subject to change without notice.

Internal Charger

If your MyoTrac Infiniti was supplied with a wall mounted AC adapter it is possible to charge the

battery pack while it is inserted in the device.

Note: Only use Thought Technology Ltd supplied wall mounted chargers with this device. Failure

to do so could result in potential injury. Use only GlobTek Part Number WR9אB2500LCP-Y-MED

where

א= 2 for North America,

א=3 for Europe,

א=5 for United Kingdom and

א=7 for Australia with

the exception of Japan where the part number is GS 889.

To start the charging plug in either the wall mounted AC adaptor or the USB cable. A full charging

cycle from fully empty to fully charged will take approximately 2hrs for AC adaptor and 5.5hrs for

the USB cable. The unit can be used while plugged in to either power source. The charging cycle

does not need to be completed in full; it can be stopped at anytime by removing the connector.

When the unit is turned off while plugged into an external power source, the screen displays a

battery symbol. Charging action is shown with an animation of the battery filling up. When the

battery is fully charged, the symbol shows a full battery.

If the unit is plugged into an external power source while it is turned off, it will start charging within

one minute.

The state of the battery charging is available by going to the power menu in the settings menu of

the device. It indicates the current mode of power and whether the unit is currently charging the

batteries.

Note: The rechargeable batteries must be fully charged prior to initial use. In order for the batteries

to reach full capacity it may be necessary to charge them several times (~2-8) after initial use.

Memory

Recorded data can be saved using three methods - choose the one which most closely matches

your usage needs. To select saving method, select the Settings menu from the main menu, and

tap on the Save icon.

• Internal Memory – Limited size, only the statistical summaries are recorded. Specifically, the

statistics for 13 open sessions or 9 training sessions (work/rest) or 6 assessment sessions

(work/rest + fast-flick + endurance) can be recorded. Data can be lost if the batteries are

removed from the unit for longer than a few minutes.

• Compact Flash Card – Most flexible method of data saving: save all the raw data for review

on the encoder or for download to the PC. Available in most electronics stores in a range of

memory sizes. Since all EMG data is recorded, the amount of data that is saved to the

compact flash card depends on the size of the card:

64MB 1.75 hours

128MB 3.5 hours

256MB 7 hours

512MB 14 hours

1GB 27.5 hours

2GB 55.5 hours

MyoTrac Infiniti™ Dual SEMG User Guide 14

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The encoder is delivered with a protective insert in the compact flash slot. To remove it, push

the button next to the slot once to eject the card. The CF card can then be inserted; you will

notice that the CF card can only be inserted one way into the encoder to protect from incorrect

insertion. When inserted properly it will be flush with the encoder rear. Follow the procedure

above to remove this card when no longer required, and re-insert the protective insert. CF

cards require a CF card reader to transfer data to the PC. The CF cards and reader can be

purchased from most computer stores. Before its first use in the encoder, a CF card requires

PC formatting using the file manager, then format the card using the BioGraph Infiniti Main

Application. Formatting and transferring CF data to the PC is covered in depth in the

BioGraph Infiniti software manual.

Real Time PC Transfer – Connect to the PC via the USB and save and display the data on

the PC in real time. See the following section “Connection to the PC”.

Attention: Do not remove the CF card without first stopping recording. If the CF card is removed

during recording, you will lose all the data for the current session.

Tapping

Like using a mouse on a computer screen the MyoTrac Infiniti allows you to use your finger or a

stylus to tap the buttons directly on the screen. The first time you start your handheld unit, or if the

power has been disconnected for a while, you will be guided through a set of welcome screens

including calibration, time and date setting. The calibration aligns the internal circuitry of the

encoder with its touch sensitive screen so that when you tap a button on the screen, the handheld

unit can detect exactly which button is being pressed. It is recommended to use a stylus when

calibrating the device as it will provide a more accurate calibration than using a finger.

Note: Always use a finger or stylus for tapping the screen. Never use a pen, pencil or other

marking or sharp object on the screen.

Damage resulting from misuse of the screen is not

covered by the warranty.

The software is designed so that once the screen has been calibrated it is possible to use all the

buttons with a finger. In many cases the touch sensitive area is greater than the graphical

constraints of the button allowing for easier operation using a finger. As necessary wipe screen

with a dry cloth to clean. Screen protectors are available from good stationary suppliers and are a

good way to extending the life of your screen.

Connection to the Client

Depending on the type of session you are going to record there are different ways to connect the

two channels to the client. Either plug the extender cable into the device directly and connect to

the client with EMG electrodes, or plug them into the pre-amplifier and the pre-amplifier into the

MyoTrac Infiniti.

Attention: When you insert the extender cable (lead wire) into the electrode

connector, MAKE SURE THAT NO BARE METAL OF THE PINS IS EXPOSED.

Before applying electrodes, be sure the skin surface is cleaned and dried. Make sure the

electrodes are placed firmly to the skin and make good contact between the skin and electrodes.

MyoTrac Infiniti™ Dual SEMG User Guide 15

Please consult the clinical guide for information on electrode selection for different placements.

The illustration below shows the division of the body into six areas of treatment.

Arms and Shoulders

Head and Neck

Abdominals

Back and Buttocks

Legs and Hips

When connecting a sensor or extender cables, be sure to

properly line up the guiding dot on the top of the plug with the

notch in the encoder's input socket. Forcing the plug into the jack

in any other position may damage your equipment.

MyoTrac Infiniti™ Dual SEMG User Guide 16

Using the MyoTrac Infiniti with AC Power Adapter or Connected to a PC

The MyoTrac Infiniti is designed for safe operation on ungrounded AC power sources. However, if

you are using the MyoTrac Infiniti while it is connected to an ungrounded AC power source, for

best results you may need to follow some simple guidelines for skin preparation and electrode

placement. These measures will help to avoid falsely elevated EMG readings while the muscle is at

rest.

If you notice elevated resting EMG levels not related to the patient’s condition, and if this occurs

only when the unit is connected to AC power (directly via the supplied AC adapter or indirectly via a

USB connection to the PC), and if it is necessary to run the MyoTrac Infiniti on ungrounded power

(i.e. no 3rd ground pin on the AC wall socket or on the PC power supply), try the following

techniques to improve the readings.

First, if you are using a PC with only 2 prongs on the wall plug and you have a grounded outlet (3

pin wall sockets with a working ground), plug the ac adapter into the MyoTrac-Infiniti and into the

grounded outlet to provide a ground for the system.

If you have no opportunity to ground either the PC or the AC adapter, use the following electrode

placement tips:

• If the EMG site is located on an extremity or limb, be sure to place the REF (black colored)

electrode more proximally (on or closer to the trunk of the body) than the sense electrodes

(yellow and blue), and at least ten centimeters away from either sense electrode.

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Prepare the skin under all three electrodes, using a product designed for skin preparation prior

to electrode application (mild abrasives such as NuPrep are effective).

If you are using Ag/AgCl (silver/silver chloride) electrodes, put some conductive electrode

paste or cream on them before applying them to the skin, or try using gel-type rather than dry

Ag/AgCl electrodes.

Resting EMG readings will not be affected by connection to AC power, in the following cases:

• Running the MyoTrac Infiniti stand-alone, with no AC power adapter and no connection to the

PC (only on its rechargeable batteries).

MyoTrac Infiniti™ Dual SEMG User Guide 17

• If the PC is portable, running the MyoTrac Infiniti unit off of the PC’s battery via the USB cable,

with the PC and the MyoTrac’s AC adapters both unplugged. Recharging using the AC

adapter may be necessary when the MyoTrac is not in use.

MyoTrac Infiniti™ Dual SEMG User Guide 18

Connection to the PC

Once connected to the PC, the encoder is

available to the BioGraph Infiniti software.

In other words, the MyoTrac Infiniti

becomes a slave device and is controlled

from the PC. When you have selected

the screens you wish to record, the

BioGraph Infiniti software will establish a

connection. When the connection has

been made the screen of the MyoTrac

Infiniti will display a message saying that

it is connected to the software. Data will

then be available from the BioGraph

Infiniti Software. Note that if the device is

a home unit, it does not deliver live data

(only Compact Flash data). Follow the

instructions in the BioGraph Infiniti

software manual for detailed information

on how to record, replay, review and print

a session using the MyoTrac Infiniti.

MyoTrac Infiniti™ Dual SEMG User Guide

The MyoTrac Infiniti can be connected to a

Personal Computer (PC). To do this, connect the

USB cable supplied to an available USB port on

the PC, and then plug the other end into the USB

connector marked with the USB Symbol on the top

edge of the MyoTrac Infiniti. As the device is plug

and play, when you switch on the encoder the

computer will automatically recognize it. Now

recognized it will be listed in the device manager as

a Human Interface Device (HID Compliant Device).

Once connected and ready to use, a “ding-dong”

sound will be played. If however a problem is

encountered, a “dong-ding” sound is played. This

sound is also played to alert the user that the USB

cable has been disconnected.

19

Screen Elements

Screens contain up to three element types:

• Data displayed in a variety of methods such as line graphs, bar graphs, and digital displays.

• Buttons to allow navigation and control of the software.

• Thought Support help icon, available in the top left of every screen.

Thought Support

Thought Support is a help feature that is available in every screen of the MyoTrac Infiniti. To

access Thought Support tap the question mark in the top left corner of every screen. This will

present you with screen specific assistance explaining the buttons and their functions. Clicking

anywhere on the screen when the help is displayed will remove it and return you to the original

screen.

MyoTrac Infiniti™ Dual SEMG User Guide 20

Settings Menu

The settings menu is accessible from the main menu and give you control over the global settings

of the MyoTrac Infiniti.

Welcome Settings

If not performed when the unit was first switched on the calibration of the screen and the setting of

the internal clock can be done from the Settings/Welcome menu. Follow the on screen instructions

to make these settings.

Save

The device will automatically set the saving or transferring methods. This screen displays the

selected method and gives you the ability to override the default selections. It favors Compact

Flash Saving over Internal Memory. Information on the amount of memory used is also displayed

in this menu.

Power

Using the power menu it is possible to view the current power settings including the battery level

and charging state.

Lock

The lock feature enables you to lock the user interface, limiting the ability to change clinical

parameters. This gives you the ability to control the prescribed treatment Script when giving the

unit to a client. Using this menu it is possible to then set up the Script that you want to use. Once

the Script is selected you set a four-digit pass code to lock the interface. To unlock enter the pass

code again. If you inadvertently forget the pass code that you have set, enter 0911 and the

encoder will unlock.

MyoTrac Infiniti™ Dual SEMG User Guide 21

Sound

The sound setting screens allow you to set up the types of sound feedback that the device

provides. The three settings that can be modified are Volume, Mini-Pause, and Feedback.

MyoTrac Infiniti™ Dual SEMG User Guide 22

Volume

The top-most button (“Volume”) allows for

general sound setup. From this screen, the

touch sound (heard each time a button has

been tapped) can be muted, voice-prompt

(heard during scripted sessions) can be

disabled and the general volume level can

be controlled.

Mini-Pause

Mini-pause is used to monitor the behavior of

a patient during regular activity hence

enabling the reduction of muscle fatigue.

The “Mini-Pause” button allows the user to

set up parameters which will alert the user to

relax their muscles during an Open SEMG

session.

Feedback

The “Feedback” button allows you to change

the style of sound feedback for each of the

two channels independently. The audio

feedback corresponds to the EMG signal.

The currently selected feedback option is highlighted in black. You can choose from nine different

sound modes:

• No Feedback

MyoTrac Infiniti™ Dual SEMG User Guide 23

• Proportionally Increasing Above Threshold

• The higher the EMG signal goes above the set

threshold, the quicker the tone of the audio feedback.

• Used for muscle control.

• Proportionally Decreasing Above Threshold

• The higher the EMG signal goes above the set

threshold, the slower the tone of the audio feedback.

• Used for muscle control.

• Proportionally Increasing Below Threshold

• The lower the EMG signal falls below the set threshold,

the quicker the tone of the audio feedback.

• Used for muscle control.

• Proportionally Decreasing Below Threshold

• The lower the EMG signal falls below the set threshold,

the slower the tone of the audio feedback.

• Used for muscle control.

• Single sound when threshold is crossed above

• A tone is heard at the moment the EMG signal crosses

above the threshold.

• Used for muscle strength.

• Single sound when threshold is crossed below

• A tone is heard at the moment the EMG signal crosses

below the threshold.

• Used for muscle relaxation.

• Continuous sound when threshold is crossed above

• A tone is heard continuously while the EMG signal

remains above the threshold.

• Used for muscle strength.

• Continuous sound when threshold is crossed below

• A tone is heard continuously while the EMG signal

remains below the threshold.

• Used for muscle relaxation.

MyoTrac Infiniti™ Dual SEMG User Guide 24

Chapter 2

SEMG sessions on your MYOTRAC INFINITI™ Dual

SEMG Encoder

What is an SEMG session?

During a Surface Electromyography (SEMG) session, muscle activity is measured and can be

recorded by sensing the electrical activity that occurs during muscle contraction and relaxation

cycles.

Surface Electromyography (SEMG) sessions can be recorded in two formats -Open Sessions or

Script Sessions. Recorded data can be saved onto the internal memory of the MyoTrac Infiniti or

onto a Compact Flash Card (CF) inserted into the MyoTrac Infiniti, or transferred in real time to the

host PC. It is also possible to not save any data and just verify the signal.

Open Sessions, also known as free-running sessions, can proceed for an unlimited duration of time

without following any set protocols. Different display types (line graph, bar graph and digital

display) can be selected to view and/or record the data.

Script Sessions, also known as protocol sessions, run for a specified period of time. A script

session includes a combination of work, rest, fast flick and/or endurance type exercises. The

number of sets for each type and the respective duration has already been determined. The

MyoTrac Infiniti has a number of predefined script sessions and furthermore allows for creation of

customized script sessions.

Features of an SEMG session

Sound Options:

During the free-running portion (before recording begins) of both Open and Script SEMG sessions,

the sound options can be modified. Since the Mini-Pause alarm is only activated during an Open

session, it is only modifiable during that session. The other sound options are Volume and

Feedback. These options are discussed in detail in Chapter 1 -> Settings Menu -> Sound.

Auto-Threshold:

In a script SEMG session, the Auto-Threshold option is available. This allows for the system, as

opposed to the clinician, to determine the threshold value. This means that during the first 3

activities of a session (i.e. work or fast-flick), the threshold that the patient is able to reach is

automatically calculated and displayed. The patient must then continue to reach that target

throughout the remainder of the session.

Open SEMG Sessions

An Open Session can proceed for an unlimited duration of time without following any set protocols.

When the user has finished recording the data or verifying the signal, they can simply stop the

session by pressing the stop button, the next button, or the back button (depending on whether the

session is being recorded or not). SEMG sessions can be viewed using one of three display

modes; as visual signals in the line graph and the bar graph or as numeric data using the digital

display mode.

MyoTrac Infiniti™ Dual SEMG User Guide 25

To start an Open SEMG session:

• Select New Open Session from the main menu.

• Select Display type (line graph, bar graph or digital display).

• Select Client to record this session for (if recording to On-Board Memory or Compact Flash

Card).

• Press the Record button having verified the signal (if session is not being saved, then it is just

running).

• When the session has been completed tap the Stop button and you will be returned to the

main menu.

MyoTrac Infiniti™ Dual SEMG User Guide 26

Script SEMG Sessions

A script session is a session where the type, number and duration of steps within the session are

pre-defined. A simple example would be a work/rest script that may contain five interspaced work

and rest steps each ten seconds in length. This would give the script a duration of 100 seconds.

The MyoTrac Infiniti comes with a number of pre defined SEMG Scripts for you to use. To select

one choose the body area that you are going to be working with, and it will show you a list of scripts

that are applicable to that body area. Alternatively, use the Custom Wizard to define your own

script following the on screen instructions. It is possible to save up to five custom SEMG scripts on

board the device.

Scripts specific to the following parts of the body are included in the device:

• Arm and Shoulder

• Head and Neck

• Abdominal and Chest

• Back and Buttocks

• Hip and Leg

To start a Script SEMG session:

• Select New Session Script from the main menu.

• Select a body area to be presented with an area specific list of scripts.

• Select a script from the list by scrolling using the arrow keys then the next button, if you need

more information on the selected script prior to selecting it press the settings button in the

button bar.

• Choose whether or not the threshold should be set automatically.

• Start the session by pressing the record button. Instructions guiding you through the script

appear in the message bar at the top of the screen.

In the review mode the data saved from a script session is compartmentalized into each of the

types of steps recorded, for example statistics are available for the entire collection of work

segments. If this session is subsequently transferred to the host PC running BioGraph Infiniti then

the information corresponding to the script that was used to record the session will also be

transmitted, even if it was a unique custom script. For more information see Chapter 3.

MyoTrac Infiniti™ Dual SEMG User Guide 27

Chapter 3

Data Management on your MYOTRAC INFINITI™

Dual SEMG Encoder

This chapter explains how to manipulate the data that you have recorded to the MyoTrac Infiniti for

a number of clients and how to interface this data with the BioGraph Infiniti on the host PC.

What is Data Management?

The MyoTrac Infiniti can save sessions in various different ways depending on your clinical needs.

It can save summary data direct to its internal memory, full sessions to the Compact Flash Card, or

full sessions (via live acquisition) directly transmitted to the host PC via the USB cable. This leads

to a need to centralize data for long-term storage (archiving) and further analysis. The host PC

handles this central storage. Data saved on the MyoTrac Infiniti Compact Flash Card can be

transferred to the PC. When this data is downloaded to the PC you can add it to existing client files

or create new ones. For further information on BioGraph Infiniti and how it handles session data

from the MyoTrac Infiniti please refer to the software manual for the BioGraph Infiniti.

MyoTrac Infiniti™ Dual SEMG User Guide 28

MyoTrac Infiniti Review

Data can also be reviewed on the MyoTrac Infiniti as a stand alone piece of equipment. It is

possible to view the summary statistics or replay the session in either of two display types. To

access the data tap the Database button on the main menu. This will present you with the saved

sessions listed in order of date. Use the up and down arrows to scroll between sessions. When

you have selected the session that you are interested in, use the forward arrow to view it.

Once you have selected the data session that you wish to manage you are presented with the

summary screen. This screen gives you information on when the session was recorded and for

which client. As you can see in the illustration below there are three choices.

• Replay – When selecting to replay a session it gives you further information on the recorded

Script and asks if you wish to replay it in the same screen type or change between the line

graph, or bar graph. This feature is only available if the session was saved to the compact

flash card.

• Session Statistics – The session statistics comprise the whole session. If the session was

recorded in a Script it breaks down the data into step type statistics (work, rest, flick and

endurance).

• Internal Session Delete – This feature enables you to permanently remove sessions that

have been recorded on the internal memory. The session saved to the CF card can only be

removed by using the BioGraph Infiniti Software.

MyoTrac Infiniti™ Dual SEMG User Guide 29

Chapter 4

Display Options on your MYOTRAC INFINITI™ Dual

SEMG Encoder

In this chapter we will take a closer look at each of the three major display types with which to view

SEMG data.

Displays

When recording an SEMG session, there are three types of data display available: Line Graph, Bar

Graph, and Digital Display.

Line Graph

The line graph display is a good choice if the signal is time dependant, and a history of the signal is

required. It is the most comprehensive of the display choices, showing in real time up to two

signals on a single set of axis. Some of the key features of the line graph are the thresholds, gain

and sweep controls.

Bar Graph

The bar graph display is designed to give a clear indication of the relative levels of each channel. It

can also be used in ratio mode to give information on the interplay of the two channels.

Digital Display

The digital display consists of two pages of numerical information computed from the two channels.

It is possible to change the automatic refreshing rate of the data displayed or to refresh manually.

MyoTrac Infiniti™ Dual SEMG User Guide 30

Line Graph

•

Record/Stop – When you initially move into the line graph screen the trace will appear on the

screen to allow you to confirm electrode placements and signals. To start the recording, press

on the circle. It will change to a square. To stop the recording press it once again. During the

recording, the word REC will flash in the status bar at the top of the screen.

Gain/Sweep – Expand or contract the X or Y axis scale to view the signal as the scale that

you want. When you tap on the gain and sweep button a sub menu appears. Use the first

button on the sub menu to select the Y or X axis to change. The second button on the sub

menu puts change focus on either the top digit or the bottom digit of the axis selected. The +

and – buttons increase or decrease the selected values.

Threshold – The threshold settings allow you to set a threshold for feedback. When you tap

on the threshold button you are presented with a sub menu. The first button on the sub menu

is used to select a threshold for Channel (A) or (B). With either A or B selected, use the + and

– buttons to move the position of the threshold up or down on the range. The button below

depicts an eye either open or closed. This is used to show or hide the selected threshold.

Line Display – This button enables you to select whether Channel A should be filled or

unfilled. Here you can also decide to show or hide the signal for each of the channels.

X and Y axis – Scales settings currently selected via the gain/sweep button.

Thought Support Help – Screen specific help. If you are not sure about the icons, this will

show you the way.

Ch A/B Legend – This is the legend for describing which line styles and displays the settings

from the line style button.

Thought Support Help – Screen specific help. If you are not sure about the icons, this will

help.

Sound Enabled – Use this button to disable the sound feedback being given in this screen.

Speaker symbol has a cross through it if the sound is disabled. Before the recording begins,

this button is also used to modify the sound settings (volume, mini-pause, if available and

audio feedback).

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MyoTrac Infiniti™ Dual SEMG User Guide 31

Bar Graph

•

•

•

•

•

•

Record/Stop – When you enter this screen the signal from the inputs will appear, enabling

you to confirm electrode placements and signals. To start the recording, press on the circle.

It will change to a square. To stop the recording press it again. During the recording the word

REC will flash in the status bar at the top of the screen.

Gain/Sweep – Expand or contract the Y axis scale to view the signal at the scale that you

want. When you select the gain button a sub menu appears. The first button A/B in the sub

menu allows you to independently change the gain for the A or B bar graph; use it to select

the one to change. The second button changes focus from the top of the gain to the bottom

number for the gain. Then use the + and – buttons to increase or decrease the gain.

Threshold – Set one threshold per channel and move it up and down the scale. Tapping the

threshold button displays a sub menu enabling you to choose bar graph A or B to adjust, and

hide/reveal the thresholds.

Bar Displays – This button changes the bars displayed in the screen. There are four choices:

both bars A and B, one or the other, or the ratio of A/B and B/A.

Thought Support Help – Screen specific help. If you are not sure about the icons, this will

help.

Sound Enabled – Use this button to disable the sound feedback being given in this screen.

Speaker symbol has a cross through it if the sound is disabled. Before the recording begins,

this button is also used to modify the sound settings (volume, mini-pause, if available and

audio feedback).

MyoTrac Infiniti™ Dual SEMG User Guide 32

Digital Display

•

Record/Stop – When you enter this screen the digital tables will be updating enabling you to

confirm electrode placements and signals. To start the recording, press on the circle. It will

change to a square. To stop the recording, press it again. During the recording the word REC

will flash in the status bar at the top of the screen.

Second Page – To display the second page of statistics press the 2nd page button. On page

two there is the ability to use a threshold. Its settings are the same as for the Line and Bar

Graph.

Refresh – This button allows you to select the refresh rate between 1,5,10 seconds or manual

refresh.

Statistics – Stats displayed for both channels include:

Max value of signal during the current refresh period.

Min value of signal during refresh period.

Mean value of signal during refresh period.

% Above is the percentage of time the signal was above the threshold during the refresh

period.

% vs. T (T being threshold value) is comparing the signal against the threshold as if the

threshold is 100% in real time.

Zero Xing (Abbreviated from Zero Crossings) is the number of times the raw signal crosses

from a negative value to a positive value and back averaged over a 1 second time period.

The Ratio A/B is displaying the ratio between the two signals in real time.

Refresh Rate – Displays currently selected refresh rate.

Thought Support Help – Screen specific help. If you are not sure on the icons, this will help.

Session Duration – Current session duration.

Sound Enabled – Use this button to disable the sound feedback being given in this screen.

Speaker symbol has a cross through it if the sound is disabled. Before the recording begins,

this button is also used to modify the sound settings (volume, mini-pause, if available and

audio feedback).

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MyoTrac Infiniti™ Dual SEMG User Guide 33

Chapter 5

Flow on your

MYOTRAC INFINITI™ Dual SEMG Encoder

New Open Session

MyoTrac Infiniti™ Dual SEMG User Guide

34

Chapter 6

Reference

Glossary of Terms, Abbreviations and Symbols

PC Personal Computer

SEMG Surface Electromyography

Stylus A blunt pointed object used to tap the screen.

CF Compact Flash

T Template

A Channel A

B Channel B

REC Record

-ve Negative

+ve Positive

Scripts Session A Script is a sequence of events in a pre-determined session duration.

Open Session An open session is defined on the fly by the clinician. Its length is governed by the Record and Stop

buttons.

Zero X-ing Then number of times the raw signal crosses from positive to negative or the reverse.

(Zero Crossings)

USB connector

MyoTrac Infiniti™ Dual SEMG User Guide 35

Technical Support and Order Placing

Returning Equipment

Be sure to call for an authorization number (RA) before returning any equipment!

Send the unit(s) postage prepaid and insured, with proof of purchase to one of the addresses

below.

If you are shipping from outside Canada or the USA to Canada, mark the package ‘Goods to be

repaired - Made in Canada’ to avoid unnecessary customs charges.

All customs and duties charges will be billed to you if incurred by sending the unit to the wrong

address.

Provide a detailed description of the problem you are experiencing, and your telephone/fax

number and email (see form on the last page of this manual).

In the USA, ship insured to:

Thought Technology Ltd.

Cimetra Industrial Park

8396 Route 9

West Chazy, New York

12992-2718, USA

In Canada and all other countries, contact your dealer or ship insured to:

Thought Technology Ltd.

2180 Belgrave Avenue

Montreal, Quebec

Canada H4A 2L8

Technical Support

For technical support please refer to the Thought Technology Ltd website at

for frequently asked questions. If your support issue is not covered

please e-mail or telephone at the number below.