Guangzhou Longest Science and Technology LGT-235 Portable Electro-Stimulation Therapy Device User Manual

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Date Submitted	2017-10-24 00:00:00
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Document Author:	2012

Portable Electro-Stimulation
Therapy Device
USER MANUAL
LGT-235
Guangzhou Longest Science & Technology Co., Ltd.
TABLE OF CONTENTS
Safety Instructions ............................................................................................................................. 6
EMC Guidance................................................................................................................................. 17
Clinical Instructions .......................................................................................................................... 25
Working Principle ............................................................................................................................. 27
Inspection of the Goods ................................................................................................................... 28
Overview of the Unit ........................................................................................................................ 30
MStim Arth Application ..................................................................................................................... 33
Operation Guidance ......................................................................................................................... 46
Care and Maintenance .................................................................................................................... 49
Troubleshooting ............................................................................................................................... 52
Technical Specifications................................................................................................................... 55
Assistance and Spare Parts............................................................................................................. 59
Warranty .......................................................................................................................................... 60
Foreword
Thank you for purchasing the LGT-235 Portable Electro-Stimulation Therapy Device from
our company.
This manual has been written for the owners and operators of the LGT-235 Portable
Electro-Stimulation Therapy Device. It contains general information on the instructions for
safety, intended use, working principle, operation, maintenance, troubleshooting, and warranty. In
order to maximize the use, efficiency, and working life of your unit, please read this manual
thoroughly and become familiar with the controls, as well as the accessories, before operating the
unit.
Specifications put fifth in this manual were in effect at the time of publication. However, owing
to policy of continual improvement by Guangzhou Longest Science & Technology Co., Ltd., any
changes to these specifications may be made at any time without obligation on the part of
Guangzhou Longest Science & Technology Co., Ltd.
Before administering any treatment to a patient, the user of this equipment should read,
understand, and follow the information contained in this manual for each mode of treatment
available, as well as the indications, contraindications, warnings, and precautions.
Product Description
The LGT-235 Portable Electro-Stimulation Therapy Device is a lightweight and portable
multifunctional electrotherapy device that provides TENS current, or MCR current.
It utilizes the low electric-current to stimulate muscle nerve to stimulate nerve and muscle
tissue, relieve pain and promote blood circulation, help improve symptoms, relieve pain, restore
and strengthen neuromuscular function.
Safety Instructions
Symbols
1. Symbols on the medical device
Symbols
Explanation
Manufacturer
Date of manufacture
EU Representative
This product complies with European Directive 93/42 EEC for medical
products. (0598 is the notified body number)
Correct Disposal of This Product (Waste Electrical & Electronic Equipment)
Statement: Contact the local authorities to determine the proper method of
disposal of potentially bio-hazardous parts and accessories.
Type BF applied part (i.e. electrode, knee pad for electrotherapy) complying
with IEC60601-1.
Protected against solid foreign objects of 12.5 mm (0.5 in) diameter and
greater;
Protected against vertically falling water drops when enclosure tilted up to
15°.
This device emits non-ionizing radiation.
Refer to instruction manual/ booklet
Caution output. It is placed near all electrode connections.
2. Symbols on the package
Symbols
Explanation
This side up
The transportation package must be vertical and straight up during transportation.
Fragile, handle with care
The product inside the packaging could be easily damaged if dropped or handled
without care and attention.
Keep away from rain
The product package should keep out of the rain and not to store it in damp
conditions.
Temperature limitation
The product package should be stored at a temperature between -20 and 55
degrees (centigrade).
Upper limit of humidity
The product package should be stored at a humidity less than 93%.
Atmospheric pressure limitation
The product package should be stored at an atmospheric pressure between
86kPa and 106kPa.
Precautionary Definitions
The precautionary instructions found in this section and throughout this manual are indicated
by specific symbols. Understand these symbols and their definitions before operating this
equipment. The definition of these symbols is as follows:
Text with a “CAUTION” indicator will explain possible safety infractions that could have the
potential to cause minor to moderate injury or damage to equipment.
Text with a “WARNING” indicator will explain possible safety infractions that will potentially
cause serious injury and equipment damage.
Text with a “DANGER” indicator will explain possible safety infractions that are imminently
hazardous situations that would result in death or serious injury.
Explosion Hazard
Text with an “Explosion Hazard” indicator will explain possible safety infractions if this
equipment is used in the presence of flammable anesthetics.
Dangerous Voltage
Text with a ”Dangerous Voltage” indicator serves to inform the user of possible hazards
resulting in the electrical charge delivered to the patient or operator in certain treatment
configurations.
Refer to Instruction Manual/Booklet
NOTE: Throughout this manual, “NOTE” may be found. These Notes are helpful information to
aid in the particular area or function being described.
10
Warnings and cautions
Please carefully read and understand the following warnings and cautions to ensure the safe
and correct use of the LGT-235 and to prevent injury.

Read, understand, and practice the precautionary operating instructions. Know the limitations
and hazards associated with using the LGT-235. Observe the precautionary and operational
decals placed on the unit.

Before using LGT-235 make sure you have read and understood all information provided in
this manual. Familiarity with the information included in this manual is an essential requirement
to ensure efficient and optimal use of the system, to avoid dangers to persons and to the
equipment, and to obtain good treatment results.

Improper installation, operation, or maintenance of the LGT-235 may result in malfunctions of
this unit or other devices.

In case of display failure or other obvious defects, switch the unit off immediately, and notify a
certified service technician.

Adjustments or replacement of components may result in the equipment failing to meet the
requirements for interference suppression.
11

This LGT-235 should be kept out of the reach of children.

Do not use this unit near the heart or chest, above the neck, on the head, around the mouth or
on diseased skin.

The placement of the electrodes can be referenced to the reference icon provided by APP,
Note that the following parts cannot be placed:
a)
carotid sinus (current may affect blood pressure and cardiac contraction, causing
arrhythmia);
b)
c)
d)
e)
f)
g)
infection site (which may aggravate the infection);
pregnant women's abdomen and lumbosacral (may cause uterine contractions);
surgical site (muscle contraction may cause wound dehiscence);
malignant neoplasms;
sensory defects or parts that are allergic to the electrodes;
eye.

Do not use this unit for purposes other than treatment indicated in this manual;

Do not use the LGT-235 with high frequency surgical equipments on the patient. It will cause
unstable output when the unit is close to the high frequency equipments (in the same room
and without shield).

Do not use electrodes with an active area of less than 25 cm²(when you choose the TENS
mode) due to the risk of associated burning. Proceed systematically with caution when the
12
density of the current is over 2 mA/ cm².

Do not modify this device without authorization of the manufacturer.

Only use this device with the charger, cables, electrodes and accessories recommended by
the manufacturer.

The LGT-235 contains built-in batteries that cannot be removed by the user. Do not replace it
by yourself to avoid damage the batteries or device. If necessary, please contact the company
or the company authorized maintenance personnel to replace.

Do not use this device simultaneously with other therapeutic device (such as microwave), to
avoid mis-operation.

Please dispose of the equipment and other accessories according to local regulations. Do not
treat them as household waste. Do not put the device in fire or water. If the batteries are not
properly disposed, it may cause a battery explosion.

Do not use when the unit is charging.

Always check the device and the electrodes for damage before use.

If the unit is not functioning properly or you feel discomfort, immediately stop using the unit. If
you feel any trouble with your body or skin, consult the doctor and follow his/her instructions.

The self-adhesive electrode limited to the same person to use, do not use in another patients
13
to prevent infection.

If the electrode loses viscosity, please replace the electrode in order to maintain good electrical
properties.

Do not use this unit in places with high humidity such as the bathrooms or while taking a bath
or shower.

Do not use this unit while sleeping. The main unit may develop trouble, or the pad may move
to an unexpected region and cause ill health.

Clean the device using a dry soft cloth. Do not use cleaning solvents or other chemical
substances in order to avoid any damage.

Make sure that you end the treatment by switching off the units or by setting the intensity to 0
mA before you remove the units or the electrodes. If you do not end the treatment, you may
experience an unpleasant sensation in your fingers. This sensation is not harmful, but can be
unpleasant.

Handle the unit with care. Do not drop, knock, or shake the unit. Rough handling can damage
internal circuit boards.

Do not apply stimulation while driving, operating machines or while performing any other
activity in which electrical stimulation can put you at risk of injury.

Always disconnect the power charger from the mains after use.
14
FCC
Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
-- Reorient or relocate the receiving antenna.
-- Increase the separation between the equipment and receiver.
-- Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
-- Consult the dealer or an experienced radio/TV technician for help.
15
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
FCC RF warning statement: The device has been evaluated to meet general RF
exposure requirement. The device can be used in portable exposure condition without
restriction.
This device and its antenna(s) must not be co-located or operation in conjunction with
any other antenna or transmitter.
FCC ID: 2ANHPLGT-235
16
EMC Guidance
This product needs special precautions regarding EMC and needs to be installed and put into
service according to the EMC information provided, and this unit can be affected by portable and
mobile RF communications equipment.

Do not use a mobile phone or other devices that emit electromagnetic fields, near the unit.
This may result in incorrect operation of the unit.

This unit has been thoroughly tested and inspected to assure proper performance and
operation!

This machine should not be used adjacent to or stacked with other equipment and that if
adjacent or stacked use is necessary, this machine should be observed to verify normal
operation in the configuration in which it will be used.
17
Accessory Information:
Item
Cable Length
Power cord (adapter)
0.13 m
Manufacturer & Address
Shenzhen Hongyi Electronic Technology Co., Ltd.
A05-1, 2/F, 3 Bldg, EC building, Yu Anju, Baoan District, Shenzhen, China
Guangzhou Longest Science & Technology Co., Ltd.
Electrode lead hose
1.2 m
5&6F, Building B4, No.11, Kaiyuan Avenue, Science City, Guangzhou Hi-tech
Industrial Development Zone, 510530 Guangzhou, Guangdong Province,
P.R. China
Bluetooth Specifications:
Bluetooth version: 4.0
Frequency Range: 2.402GHz ~ 2.480GHz
Output Power: 1mW
18
Guidance and manufacture’s declaration – electromagnetic emission
The LGT-235 is intended for use in the electromagnetic environment specified below. The
customer of the user of the LGT-235 should assure that it is used in such an environment.
Emission test
Compliance
Electromagnetic environment – guidance
The LGT-235 use RF energy only for its internal
RF emissions
Group 1
CISPR 11
function. Therefore, its RF emissions are very low
and are not likely to cause any interference in
nearby electronic equipment.
RF emission
Class B
CISPR 11
Harmonic emissions
IEC 61000-3-2
Voltage
LGT-235
establishments,
Class A
is
suitable
for
including
use
in
all
domestic
establishments and those directly connected to the
public low-voltage pump supply network that
fluctuations/
flicker emissions
The
Complies
supplies buildings used for domestic purposes.
IEC 61000-3-3
19
Guidance and manufacture’s declaration – electromagnetic immunity
The LGT-235 is intended for use in the electromagnetic environment specified below. The
customer or the user of LGT-235 should assure that it is used in such an environment.
IEC 60601 test
Electromagnetic environment
Immunity test
Compliance level
level
- guidance
Electrostatic
±6 kV contact
±6 kV contact
Floors should be wood, concrete
discharge
±8 kV air
±8 kV air
or ceramic tile. If floor are
(ESD)
covered with synthetic material,
IEC 61000-4-2
the relative humidity should be at
least 30%.
Electrical fast
±2 kV for power
±2kV for power
Mains power quality should be
transient/ burst supply lines
supply lines
that of a typical commercial or
IEC 61000-4-4 ±1 kV for
hospital environment.
input/output lines
Surge
± 1 kV line(s) to
±1 kV differential
Mains power quality should be
IEC 61000-4-5 line(s)
mode
that of a typical commercial or
± 2 kV line(s) to
hospital environment.
earth
Voltage dips,
<5% UT (>95% dip
<5% UT (>95% dip
Mains power quality should be
short
in UT) for 0.5 cycle
in UT) for 0.5 cycle
that of a typical commercial or
interruptions
hospital environment. If the user
40% UT (60% dip in 40% UT (60% dip in
and voltage
of
the
LGT-235
requires
20
variations on
power supply
input lines
IEC
61000-4-11
UT) for 5 cycles
UT) for 5 cycles
70% UT (30% dip in
UT) for 25 cycles
<5% UT (>95%
dip in UT) for 5 sec
70% UT (30% dip in
UT) for 25 cycles
<5% UT (>95% dip
in UT) for 5 sec
Power
frequency
(50Hz/60Hz)
3 A/m
magnetic field
IEC 61000-4-8
NOTE
3 A/m
continued
operation
during
power mains interruptions, it is
recommended that the LGT-235
be
powered
from
an
uninterruptible power supply or a
battery.
Power frequency magnetic fields
should be at levels characteristic
of a typical location in a typical
commercial
or
hospital
environment.
UT is the a.c. mains voltage prior to application of the test level.
21
Guidance and manufacture’s declaration – electromagnetic immunity
The LGT-235 is intended for use in the electromagnetic environment specified below. The
customer or the user of the LGT-235 should assure that it is used in such an environment.
Immunity
IEC 60601 Compliance
Electromagnetic environment - guidance
test
test level
level
Portable and mobile RF communications
equipment should be used no closer to any part of
the LGT-235, including cables, than the
recommended separation distance calculated from
the equation applicable to the frequency of the
transmitter.
Recommended separation distance
d = 1.2 √P
Conducted RF
3 Vrms
3 Vrms
IEC 61000-4-6 150 kHz to
80 MHz
Radiated RF
3 V/m
IEC 61000-4-3
80 MHz to
3 V/m
d = 1.2 √P
80 MHz to 800 MHz
d = 2.3 √P
800 MHz to 2.5 GHz
2.5 GHz
Where P is the maximum output power rating of
22
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
determined by an electromagnetic site survey, a
should be less than the compliance level in each
frequency range.b
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 LGT-235 is used
exceeds the applicable RF compliance level above, the LGT-235 should be observed to
verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as re-orienting or relocating the LGT-31.
b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
23
Recommended separation distances between portable and mobile RF communications
equipment and the LGT-235
The LGT-235 is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the LGT-235 can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the LGT-235 as recommended below, according to
the maximum output power of the communications equipment.
Separation distance according to frequency of transmitter (m)
Rated maximum
output power of 150 KHz to 80 MHz
80 MHz to 800 MHz
800 MHz to 2.5 GHz
transmitter (W)
d = 1.2 √P
d = 1.2 √P
d = 2.3 √P
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
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 80MHz and 800MHz, 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.
24
Clinical Instructions
Before a treatment with the LGT-235 Portable Electro-Stimulation Therapy Device, a
correct examination and diagnosis should be performed.
Indications
The LGT-235 Portable Electro-Stimulation Therapy Device can alleviate acute and chronic
pain, also can stimulate nerves and muscles, causing muscle contraction.
Contraindications
Patients with the following disease are forbidden to use the LGT-235 Portable
Electro-Stimulation Therapy Device:
1)
Patient with severe heart failure or arrhythmia, and patient with pacemaker;
2)
Patient with venous thrombosis or thrombophlebitis;
3)
Patient who is in the acute or critical stage of important organ disease;
4)
Patient whose treatment area with bleeding tendency ，metal matter or tuberculous lesions;
5)
Patients who cannot provide sensory feedback for stimulation (unable to express or have
difficulty in communication),such as mental disease.
25
Adverse Effects
You should stop using the device and consult your doctor if you experience adverse reactions
from the device. Possible adverse reactions may include the following:

skin irritation beneath the electrodes;

burns beneath the electrodes;

headaches or other painful sensations.
26
Working Principle
Display
Screen
Communication of
Mobile Phone APP
and Bluetooth
PWM Intensity
Adjustment
Bluetooth
Chip
Processor
AC Input
Power
Adapter
Battery
Pulse
Generating
Current
Feedback
Button
27
Electrode
Inspection of the Goods
1. Unpacking the Unit
The unit is generally delivered with the packaging material supplied by the manufacturer.
Proceed as follows:

Position the transport packaging so that the arrows are pointing upward.

Remove the transport packaging upward.

Remove the remaining foam material.
2. Inspections
Immediately upon unpacking the unit, perform the following steps:
1)
2)
Verify the delivery documents to make sure that the delivery is complete.
Check the LCD touch screen of the unit when unpack the packaging and make sure it is in
good condition. Any scratch on the surface during use will be not covered in the warranty.
3)
4)
Check the external components and accessories for possible damage due to transport.
Verify that the packaging contains the following:
28
NO.
Item Name
Amounts
Unit
LGT-235 main unit
piece
Power adapter
piece
Electrode lead hose
pieces
knee pad for electrotherapy
piece
Certificate of quality
piece
Warranty card
piece
Installation checklist
piece
User manual
piece
Other parts of LGT-235 are available as accessory on demand. Visit website www.longest.cn
to obtain more information.
29
Overview of the Unit
1. Nomenclature
Increasing intensity button
Decreasing intensity button
Indicator light: see table:
meaning of indicator light
ON/ OFF button
Output sockets: connect electrode lead hose
Micro-USB port: connect power adapter. Slide
the slider to output sockets when charging.
30
Table: meaning of indicator light
Status
Power off
Ready
Indicator colour
None
Green
Stimulation on
Blue
Low battery cannot
be used
Charging
Fully charged
Electrodes fall off
during treatment
Yellow
Green
Way of flashing
None
Flash at 1Hz frequency
The flash frequency is consistent with the
output pulse frequency
Flash at 3Hz frequency for 1s, and then turn
off the unit.
Always bright
Always bright
Yellow
Flash at 1Hz frequency
Yellow
2. Accessories
2.1 Electrode lead hose
The electrode lead hose connect with the main unit and electrodes.
31
2.2 knee pad for electrotherapy
2.3 Optional Accessories
No.
Item name
Glove for electrotherapy
Sock for electrotherapy
Self-adhesive electrode with magnetic connection: 50mm×50mm (square)
32
MStim Arth Application
LGT-235 Portable Electro-Stimulation Therapy Device can only be used with the software
provided by our company.

Name of the software: MStim Arth

Release Version: 1

Software operating environment:
Android 4.3 or later mobile phone, with 4.0 Bluetooth.
iOS 8 or later iPhone mobile phone, with 4.0 Bluetooth.
33
1. Install MStim Arth Application
Click
the
MStim
Arth
Application
installation
package (APK file) on your phone, and follow the
prompts to install the application.
2. Open MStim Arth Application
After the MStim Arth Application is installed
properly, it will appear
on your phone desktop.
Click the icon and the main interface of the MStim Arth
appear, as shown on the left.
34
3. Connect the Device
Click “connect the device” to connect MStim Arth Application which on the phone and the
device via Bluetooth.
35
4. Main Interface
Open MStim Arth, you can see the main interface,
as shown on the left.
There are three modes on the MStim Arth: TENS
Mode, and MCR Mode.
36
4.1 TENS Interface
1)
Enter TENS interface
Click TENS at the main interface to enter the TENS
interface, as shown on the left.
2)
Select output channel
Select single or dual channel outputs as needed.
3)
Choose output mode
TENS has four output modes: Acute pain, Chronic
pain, Arthrocele, and Relaxing Massage.
4)
Set the treatment time
The treatment time is range from 1-60min, default
30min.
37
5)
Start treatment
When the parameter is set, click the start button to
start the treatment.
6)
Adjust output intensity
Click the start button, the output intensity can be
adjusted. Click
38
button, interface pop-up tip:
7)
locking interface
The APP locks automatically after some time of
inactivity to prevent accidental operation. Just press the
avatar swipe screen to unlock.
8)
End of the treatment
At the end of the treatment, the unit stops output
and returns to the pre start state. The indicator is
switched from blue to green and flashes at 1Hz
frequency, while the mobile application interface shows
"the treatment is finish."
39
4.2 MCR Interface
1)
Enter MCR interface
Click MCR at the main interface to enter the TENS
interface, as shown on the left.
2)
Set the treatment time
The treatment time is range from 1h-12h, default 1h.
3)
Start treatment
When the parameter is set, click the start button to
start the treatment.
4)
Adjust output intensity
Click the start button, the output intensity
can be adjusted.
5)
End of the treatment
At the end of the treatment, the unit stops output and
returns to the pre start state. The indicator is switched
from blue to green and flashes at 1Hz frequency, while
the mobile application interface shows "the treatment is
finish."
40
5. Open circuit tip
When the treatment electrode is disconnected, the
device appears with the following prompt, please
re-paste the electrode.
41
6. Help
Click the icon
in the upper right corner of the
main interface, or slide the interface in the main interface
to see more, click the icon
interface.
42
, enter the help
6.1 Using guidance
There is some introduction of how to operation the
LGT-235
Portable
Electro-Stimulation
Therapy
Device in using guidance, which is convenient for you to
understand the use of device.
43
6.2 Common problem
MStim Arth Application includes a variety of
common problems, you can learn more about the
LGT-235
Portable
Device and treatment.
44
Electro-Stimulation
Therapy
Operation Guidance
1. Preparing for use
1.1 Charging the unit
To be able to use the device, you first have to charge the unit. Put one side of power adapter
connects with the unit; another side connects with the power socket. The status indicator on the unit
flashes yellow during charging. The status indicator stops flashing turn to green when the battery is
fully charged.
NOTE: If the rechargeable battery of the units is not fully charged when you start a treatment, the
batteries may run out during the treatment. We advise you to always fully charge the unit
before you start a treatment.
NOTE: Always disconnect the power charger from the mains after use.
Do not use when the unit is charging.
FOR-MRRD0001-EN235 UM0.1
1.2 Turn on the unit
Press the ON/OFF button to turn on the unit to standby.
1.3 Open the MStim Arth and connecting
Turn on the MStim Arth Application on your phone and connect the unit to your phone via
Bluetooth.
1.4 Clean the skin
Use alcohol or soapy water to clean the skin.
1.5 Wear the knee pad for electrotherapy
Wear the knee pad for electrotherapy according the drawing of APP or the actual situation and
place the main unit in the knee pad for electrotherapy.
1.6 Connect the unit
Connect one end of electrode lead hose to the electrodes, the other end to the unit.
2. Starting a Treatment
2.1 Parameter Setting
According to the actual situation, choose the appropriate electrical stimulation therapy or
protocol, set the treatment parameters, treatment time, etc. (see the chapter MStim Arth
Application)
FOR-MRRD0001-EN235 UM0.1
2.2 Press the START button
Click the start button and the treatment begins.
2.3 Adjust output intensity
You can adjust the output intensity in the MStim Arth interface, or through "+/-" button on the
unit. The output intensity should be increased slowly from small values to avoid excessive
stimulation. Since your body initially adapts to the intensity of the stimulation, you may have to
adjust the intensity level after some time to ensure optimal stimulation.
2.4 The End of Treatment
At the end of the treatment, the unit stops output and returns to the pre start state. The
indicator is switched from blue to green and flashes at 1Hz frequency, while the mobile application
interface shows "the treatment is finish."
Remove the knee pad for electrotherapy and electrode lead hose after treatment. The main
unit, electrode lead hose and the knee pad for electrotherapy are put into the box, placed in a cool
and ventilated place, ready for the next use.
FOR-MRRD0001-EN235 UM0.1
Care and Maintenance
1. Cleaning
1)
Please turn off the device before the cleaning and disinfection operation;
2)
For the main unit cleaning, what recommended are a clean, soft damp cloth for stains, and a
clean, soft dry cloth for dust in the surface of the main unit;
3)
Clean the knee pad for electrotherapy: Wipe the surface of the kneecap with a damp cloth or
antiseptic wipe after use. It can be washed if necessary: moderate amount of neutral detergent,
soak for a short time, be careful, gently rinse and dry naturally. Not machine washable, rubbed
and bleached.
Do not clean the main unit with organic solvent such as gasoline or diluents, otherwise damage
will be happened to the main unit such as deformation and falling off of the paint.
2. Routine Maintenance
If it is used in accordance with the instructions of the user manual, the device does not need a
particular regular maintenance.
FOR-MRRD0001-EN235 UM0.1
Manufacturer will provide circuit diagrams, component part lists, descriptions, calibration
instructions to assist to service personnel in parts repair.
The unit and accessories must be checked at regular intervals.
1) Check the power line to ensure if there is no distortion, fracture, etc. These circumstances may
cause fire hazard. Please replace a new power line immediately.
2) Replace the electrodes if:
-- they are damaged or torn.
-- they are past the use-by date.
-- they have lost their adhesive power. Never use plaster or tape to attach them to your skin.
-- stimulation feels less strong.
-- when the stimulation is uncomfortable, i.e. when you experience an unpleasant stinging or
biting sensation.
NOTE: Always replace the electrodes with electrodes recommended for this device by the
manufacturer.
Never perform unauthorized service work. All service work must be performed only by service
technicians who have been authorized by the manufacturer.
FOR-MRRD0001-EN235 UM0.1
3. DISPOSAL
For environmental reasons, do not dispose of the device in the household waste at the end of
its useful life. Dispose of the unit at a suitable local collection or recycling point. Dispose of the
device in accordance with EC Directive – WEEE (Waste Electrical and Electronic Equipment). If
you have any questions, please contact the local authorities responsible for waste disposal.
FOR-MRRD0001-EN235 UM0.1
Troubleshooting
This chapter summarizes the most common problems you could encounter with the LGT-235
Portable Electro-Stimulation Therapy Device. If you are unable to solve the problem with the
information below, please call the distributors.
Troubles
Possible causes
Solutions
1. The indicator does not
light up at all when press
the ON/OFF button
2. The MStim Arth APP
on the mobile phone
could not connect with
the unit.
The battery of the unit is empty.
Charge the unit (see chapter
Preparing for use’).
1. The unit is not turn on;
2. Mobile phone Bluetooth is not
open or mobile phone Bluetooth
problems
3. the distance of the mobile
phone and the unit is too far;
4. The unit has contacted
another mobile.
The unit is asleep and Bluetooth
is stopped.
1. Turn on the unit;
2. Please turn on the Bluetooth
on the mobile phone or change
another mobile phone;
3. Please keep the mobile phone
near the unit;
4. Disconnect the connected
phone or restart the unit;
5. Restart the unit.
FOR-MRRD0001-EN235 UM0.1
Troubles
Possible causes
Solutions
3. The status indicator
on the unit flashed
Yellow and the unit
switched off.
4. There is not output.
The battery of the unit is empty.
Charge the unit (see chapter
Preparing for use’).
1. Did not press the start button;
2. Did not adjust the output
intensity;
3. The electrode lead hose
connected badly;
4. The electrode lead hose has
been damaged.
1. The output intensity is too
high;
2. Damaged or worn knee pad
for electrotherapy or electrode
lead hoses;
3. Electrode active area size is
too small.
1. Press the start button;
2. Adjust the output intensity;
3. Re-connect the electrode lead
hose;
4. Replace a new electrode lead
hose.
5.
Stimulation
uncomfortable.
is
1. Decrease the output intensity;
2. Replace;
3. Replace electrodes with ones
that have an active area no less
than 25.0cm2.
FOR-MRRD0001-EN235 UM0.1
Troubles
Possible causes
Solutions
6. The MStim Arth APP
on the mobile phone pop
up tips “electrodes fall
off”, the indictor of the
unit flashed Yellow.
1. The electrode lead hose
connected badly;
2. The electrodes are poor
contact with the skin.
3. Electrodes do not stick well;
7. The unit has output,
but treatment without
sensation.
The output intensity is too low.
1. Re-connect the electrode lead
hose;
2. Re-connect the electrodes. 3.
Replace
electrodes.
Apply
electrodes to a clean, dry
surface.
Increase the output intensity.
FOR-MRRD0001-EN235 UM0.1
Technical Specifications
1. Stimulator Output Parameters
1.1 TENS Parameters
Channels:
One channel
Output Mode:
Acute pain, Chronic pain, Arthrocele, and Relaxing Massage
Output Waveform:
Symmetrical biphasic asynchronous
Pulse Duration:
Mode
Pulse Duration (μs)
tolerance
Acute pain
200
±20%
Chronic pain
200
±20%
Arthrocele
500
±20%
Massage
50
±20%
Mode
Pulse Frequency (Hz)
tolerance
Acute pain
80-120 (cycle sweeping)
±1Hz
Chronic pain
1-20 (cycle sweeping)
±1Hz
Pulse Frequency:
FOR-MRRD0001-EN235 UM0.1
Timer:
1)
2)
3)
Output intensity:
Arthrocele
60
±1Hz
Massage
1-120 (random)
±1Hz
Treatment time: 1min-60min, stepping 1min;
Timer tolerance: ±2%;
When finish, the device can stop output and prompt.
Adjustable, 0mA-100mA(p-p), stepping 1mA, ±5mA or ±10% tolerance
(at 500Ω load)
Maximum
Current
the maximum current will be limited to 50mA r.m.s.at 500 Ω Load
(r.m.s):
1.2 MCR Parameters
Channels:
One channel
Output Waveform:
Symmetrical biphasic asynchronous
Pulse Frequency:
Range from Hz-100Hz (random)
Pulse Duration:
50% of Output Cycle, ±10% tolerance
Timer:
1)
2)
3)
Treatment time: 1h-12h, stepping 1h;
Timer tolerance: ±2%;
When finish, the device can stop output and prompt.
FOR-MRRD0001-EN235 UM0.1
Output intensity:
Adjustable, 0μA -100μA, stepping 10 μA, ±1 mA or ±10% tolerance, take
larger values (at 500Ω load)
Maximum
Current
the maximum current will be limited to 5mA r.m.s.at 500 Ω Load
(r.m.s):
2. Other specifications
Product Name
Portable electro-stimulation therapy device
Model
LGT-235
Power supply:
Adapter model: HYI11-005
Adapter supply voltage: AC100-240V, 50/60Hz;
Adapter output: DC 5V, 2A.
Battery: 3.7V, 1200mAh, lithium battery.
Line Current Isolation: Patient disconnected when charging.
Expected life

The expected life of the main unit is five years under normal usage.
(Except for man-made damage). The Date of product manufacture
see label on the device.

The expected life of the electrode lead hose and knee pad for
electrotherapy are 12 months under normal usage. (Except for
FOR-MRRD0001-EN235 UM0.1
man-made damage).

Cycle time of electrodes: Usage varies depending on your skin
type. We recommend that you keep your skin clean and dry when
you use it, usually around 20-30 times.
Rate power :
6VA
Dimension:
59mm (W) × 59mm (L) × 22mm (H)
Weight:
60g (only main unit)
Classification:

Classification (IEC 60601-1): Class II, Type BF Applied Part;

Ingress Protection: IP22;




Mode of operation: Continuous.
Temperature: 5 to 40℃;
Rel. humidity: ≤80%;
Atmosphere Pressure: 86.0 to 106.0kPa.
and storage:



Temperature: -20 to 55℃
Rel. humidity: ≤93%
Atmosphere Pressure:86.0 to 106.0kPa
Works with:
Requires a smart phone with Bluetooth 4.0, Android 4.3 (or later) or iOS
Environmental
conditions of operation:
Environmental
conditions of transport
8 or later.
FOR-MRRD0001-EN235 UM0.1
Assistance and Spare Parts
Every intervention on device must be performed by manufacturer. For any assistance
intervention and original spare parts please contact the manufacturer at following address:
GUANGZHOU LONGEST SCIENCE & TECHNOLOGY CO., LTD.
Add: 5&6F, Building B4, No.11, Kaiyuan Avenue, Science City, Guangzhou Hi-tech Industrial
Development Zone, 510530 Guangzhou, Guangdong Province, P.R. China
Tel: +86 20 6635 3999
Fax: +86 20 6635 3920
Email: service@longest.cn
Website: www.longest.cn
EU Representatives Information
Lotus Global Co., Ltd
Company address: 1 Four Seasons Terrace West Drayton, Middlesex London, UB7 9GG,
United Kingdom
Tel: +44 20 75868010, 70961611
Fax: +44 20 79006187
To preserve product warranty, functionality and product safety we recommend using only
original spare parts.
FOR-MRRD0001-EN235 UM0.1
Warranty
The Manufacturer warrants that the LGT-235 is free of defects in material and workmanship for
the main unit. This warranty shall remain in effect for one year (12 months) from the date of original
consumer purchase. If this Product fails to function during the one year warranty period due to a
defect in material or workmanship, at the Manufacturer's Option, Manufacturer or the authorized
dealer will repair this Product without charge.
The users should fill out the Warranty Card as soon as the product is installed and send a copy
to service@longest.cn to have the warranty be valid. Damages due to non-adherence to the User
Manual or wear of parts are excluded from warranty.
This Warranty Does Not Cover:

Replacement parts or labor furnished by anyone other than the Manufacturer, the authorized
dealer or a certified Company service technician.

Defects or damage caused by labor furnished by someone other than Manufacturer, the
authorized dealer or a certified Company service technician.

Any malfunction or failure in the Product caused by product misuse, including, but not limited to,
the failure to provide reasonable and necessary maintenance or any use that is inconsistent
with the User Manual.
FOR-MRRD0001-EN235 UM0.1

---

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