schwa-medico EMP 4 PRO User manual

Art.-Nr. 200506
EMP 4 PRO
Four-channel transcutaneous muscle and nerve stimulator
Instruction Manual Art.-No. 101447-V01
Art.-No. 104061

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Contents
General Information ...................................3
Intended use .............................................3
Safety instructions .....................................3
Contra indication ........................................3
Side effects ................................................4
Description of the symbols ........................4
Technical specifications ............................5
Pulse form ..................................................5
Description of the EMP 4 PRO ...................6
Description of the display ..........................6
Display of electrical current form ..............7
Operating the EMP 4 PRO ..........................7
Power mode ...............................................7
Using the 220-Volt mains adapter .............7
Using the battery .......................................7
Battery level ...............................................8
Recharging the battery ..............................8
Switching ON the EMP 4 PRO ...................8
Connecting the cables
and the electrodes .....................................8
Selecting a program ...................................8
Selecting an area of stimulation ...............9
Setting the intensity ..................................9
Pausing the stimulation ...........................10
Automatic change of the sequences .......10
Manual change of the sequences ...........10
Stopping the stimulation .........................10
Switching OFF the EMP 4 PRO ................10
Electrode recognition
for enhanced safety .................................11
Overview pre-set programs .....................12
Programs for upper and lower limbs .......13
User programs for own settings ..............13
Overview user programs ..........................14
Setting parameters for user programs ....15
Acoustic signal .........................................16
Information on total
stimulation duration .................................16
Settings, modifications and repairs ........16
Warranty ..................................................16
Guarantee.................................................16
Maintenance and cleaning ......................16
Classification of the device .....................16
Technical check ........................................17
Delivery content .......................................17
Accessories ..............................................18
Stimex self-adhesive electrodes .............18
Silicone electrodes ..................................18
MedicoBack..............................................19
Stimex garment electrodes ......................19
Vaginal probes ........................................20
Cables .....................................................20
Setting of intensity levels ........................20
Principle of dynamic stimulation .............21
Positioning of the electrodes
for dynamic stimulation ...........................21
Short instruction use ................................23
Electrode positioning ...............................24

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General Information
Intended use
The EMP 4 PRO device has been designed for the transcutaneous stimulation of muscles
and nerves and may not be used for any other purposes.
Safety instructions
Please read the operating instructions carefully before using the EMP 4 PRO.
• The EMP 4 PRO is only to be used for stimulation purposes on one patient at any one time.
• Only use the EMP 4 PRO with original accessories.
• The size of the electrodes should to be not less than 2 cm².
• The electrodes should be positioned in such ways that the current flow will not cross
through the heart.
• Keep the EMP 4 PRO away from water or other liquids. Do not drop the EMP 4 PRO, do
not use it inappropriately or expose it to extreme temperatures or high levels of humidity
(not less than 10 °C or more than 40 °C or a relative humidity of more than 90 %).
• Do not use the EMP 4 PRO if it is not working properly or if it has been damaged in any way.
• Be careful when using the EMP 4 PRO near or on children. Keep the unit away from children.
• Always store the EMP 4 PRO in its case to protect it from damage and dust.
• To avoid reciprocal interference, the EMP 4 PRO should not be operated in the vicinity
of other electronic devices. If this is not possible, the various unit functions should
be closely monitored during operation so that proper use in accordance with the
regulations is ensured.
• The simultaneous connection to the patient of a high frequency surgical unit can lead
to burning under the electrodes or around the probe.
• Operating close (for example 1m) to short wave and microwave units or mobile
telephone systems can cause fluctuations in the output values of the electric current
stimulation unit.
• Do not use the machine during the simultaneous operation of other machines, when
driving or when asleep.
Contra indication
Please check with your physician before using the EMP 4 PRO if one of these
apply to you:
• Patients with electronic implants such as heart pacemakers, defibrillators or pumps
• Patients with cardiac rhythm disorders
• During pregnancy

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• Patients subject to seizure disorder / epilepsy
• Patients with skin disorders in the vicinity of the electrodes
• Patients with malignant diseases in the region of application
Side effects
• Pain caused by the stimulation: The stimulation can be perceived as uncomfortable/
painful if the electric current is too intensive or if the electrodes have been positioned
unfavorably. Unpleasant side effects can be avoided by adjusting the intensity,
using another program with other parameters and the possible re-positioning of the
electrodes.
• Skin intolerance which can result from the electrodes, the electrode gel or the electric
current impulses. The physician should be consulted in cases of reddening, burning,
itching or blistering under the electrodes or in the vicinity of the electrodes. Slight skin
reddening of short duration in the area of the electrodes following stimulation is quite
normal because blood circulation has been improved by the effects of the stimulation.
• Muscular pain: If the stimulation has been too intense or too long muscular aches
in terms of sore muscle can occur. Shorten the treatment time and the intensity of
stimulation at the beginning of muscle stimulation to avoid muscle ache.
Description of the symbols
Attention: Read accompanying documents, especially user manual!
BF type application part. Protection against electric shocks.
The year of construction of the product follows this symbol.
The article or order number of the product follows this symbol.
The serial number of the product follows this symbol.
This equipment is marked with the recycling symbol. It means that at
the end of the life of the equipment you must dispose of it separately at
an appropriate collection point and not place it in the normal domestic
unsorted waste stream. This will benefit the environment for all.
By labelling with CE certificate, the manufacturer states that the
product meets all active requirements of the regarding EU Directive.
A conformation evaluation process has been successfully completed.
The code number of the conformation evaluation process is given in
accordance with the CE labelling of the involved notified body.

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This product works with a nickel metal hydride rechargeable battery. The
rechargeable battery must be recycled. At the end of the working life of the
rechargeable battery you must dispose of it separately at an appropriate
collection point and not place it in the normal domestic unsorted waste
disposal. In the interests of environmental protection please observe
those laws and regulations of your country which relate to rechargeable
battery disposal.
Technical specifications
Four-channel nerve and muscle stimulator with electrically insulated channels, constant
current characteristic, output short circuit control element (AKS), 60 integrated pre-set
programs and 8 user programs.
Output current: 100mA (with an actual resistor of 1kΩ)
Frequency range: 1-120 Hz
Pulse width: 50-350 μs
Power supply: - mains supply transformer 12V / 1.25A or
- 9.6 V NiMH rechargeable battery
Dimensions: 14.5 x 9.2 x 4.2 cm
Weight approx. 308 g (incl. rechargeable battery)
Pulse form
Biphasic impulses with AKS
Biphasic symmetric impulses with pause and AKS
NiMH
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U
t
on 1 kΩ real on ANSI 200
U
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U
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on 1 kΩ real on ANSI 200

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Description of the EMP 4 PRO
1. Display
2. P key: program selection key
3. 4 + key: program start key and simultaneous increase
of all channels
4. key: selection of stimulation area / Pause + EDIT
function for USER programs
5. Keys to adjust the intensities of each
channels
▲ Increasing intensity
▼ Decreasing intensity
6. ON/OFF key
7. Battery compartment
8. Output socket for the battery charger /
main circuit transformer
9. Output sockets for the cables
10. Main circuit transformer / charger
Description of the display
1. Intensity of channel 1
2. Intensity of channel 2
3. Intensity of channel 3
4. Intensity of channel 4
5. Battery level
6. Program in use
7. Stimulation time
8. Sequence number
9. Electrical current form
10. Stimulation area
14
23
10
69
5 7 8
1
5
4
2
3
6
8
7
10
9
8

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Display of electrical current form
Stimulation pause
Stimulation rising ramp
Stimulation work phase
Stimulation falling ramp
Biphasic asymmetric impulse
Biphasic symmetric impulse
Biphasic symmetric impulse with pause
Operating the EMP 4 PRO
Power mode
You can use the device directly from the 220 Volt mains or with the rechargeable battery
in the device.
Using the 220-Volt mains adapter
• Connect the cable to the central supply socket on the front face of the device between
the channel outlets 2 and 3 (number 8).
• Connect the mains adapter to your mains circuit socket.
The device operates from the mains supply whether or not a rechargeable battery has
been inserted.
Using the battery
New devices:
The battery is already inserted in new devices. Please fully charge the battery before first
use of the EMP 4 PRO.
Otherwise:
Open the battery compartment, plug the battery into the connector inside the compartment
(upside right), place the battery in the compartment, close the compartment. The device is
ready for battery mode operations. The mains power adapter is only necessary to recharge
the battery.

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Battery level
The battery symbol on the display indicates the battery level. A completely charged
battery shows all bars in the symbol. The fewer the bar symbols, the lower the battery
charge level.
Recharging the battery
The battery must be recharged if the battery display indicates empty.
• Switch off the device.
• Ensure that the battery is in its compartment, correctly inserted and the compartment
closed.
• Connect the mains adapter to the socket in the centre of the upper part of the device
(number 8).
• Connect the mains adapter to the mains circuit.
• The display shows an increasing number of bars. The charging time lasts up to 3
hours. The charger stops automatically once the battery is fully charged.
• To check if the battery is fully charged, disconnect the device from the mains adapter
and switch on the device. The battery indicator on the top left side of the screen
displays the battery level.
Switching ON the EMP 4 PRO
Press the key to start the device (number 6).
The program shown on the display is the last program used.
The device automatically switches OFF after 2 minutes of disuse.
Connecting the cables and the electrodes
• Connect the electrodes with the cable(s) (always 2 electrodes per cable).
• Connect the cables to the EMP 4 PRO on socket no. 9.
• Place the electrodes on the desired area (see electrode placement).
Selecting a program
Select a program by pressing the P key. To scroll through the programs, press the P key
as often as necessary until you have selected the program of your choice. To return to the
previous program, press the ▼ key of channel 1 (far left side).

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Selecting an area of stimulation
Depending on the selected program you can choose between upper and lower limbs. The
body symbol on the display is half colored, depending on the selected limbs. The pulse
width is increased for lower limbs.
Press the key to select the area of stimulation.
Programs with a possibility of upper and lower limbs stimulation:
P1 - P4, P6, P17, P21 - P26, P32, P38, P40 - P47, P49 - P60
Setting the intensity
Start the stimulation by increasing the intensity with the ▲ key of the channel(s) connected
to the electrodes.
Alternatively you can increase the intensity of all four channels simultaneously by pressing
the “4 +” key. You can then adjust the intensity of each channel by using the ▲ and ▼
keys.
You increase the intensity with the ▲ key.
You decrease the intensity with the ▼ key.
The intensity of each channel is displayed on the screen. The intensity can be set between
0 and 100 mA.
Setting the intensity of agonist/antagonist program (P37 and P67):
When you are using agonist/antagonist programs (P37 and P67), first set the intensity of channel
1 and 2 and then set the intensity of channel 3 and 4.
Active channels are identified by flashing intensity values.
If the intensity of all channels is not changed over a three seconds period, the device starts
with the agonist/antagonist stimulation. Please note that the stimulation is alternating
between channel 1 and 2, respectively 3 and 4.
If you are stimulating with dynamic programs (P56 to P60 and P65 to P66) or agonist/
antagonist programs (P37 and P67), active channels are identified by flashing intensity
values.

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Pausing the stimulation
You can temporarily stop the stimulation by pressing the key during the stimulation. The
word “PAUSE” then flashes on the display.
You can then adjust the position of the electrodes.
Press again to re-start the stimulation. The intensity levels slowly increase to the level
set before the pause.
Automatic change of the sequences
Some programs consist of several sequences. Each sequence uses different parameters. The
device changes from one sequence to the other automatically. This change is indicated by an
acoustic signal. The sequence number is displayed on the screen at the top right side next to the
“S” symbol.
The intensity of the stimulation is then automatically adjusted depending on the sequence.
It may be necessary to re-adjust the intensities to the desired level.
Manual change of the sequences
If you want to skip one or more sequence(s) manually, first press to temporarily stop the
stimulation (see pausing the stimulation), then press the “4+” key to select the sequence of
your choice. The sequence number is displayed on the screen at the top right side next to the
“S” symbol.
Press again to re-start the stimulation. For safety reason the intensity is set back to zero
if you skip a sequence. Adjust the intensity by pressing the “4+” or the “▲” and “▼” keys
(see setting the intensity).
Important note:
The stimulation time can only be changed for programs with a single sequence. The time
cannot be changed for programs with an asterisk* (see program overview).
Stopping the stimulation
You can stop the stimulation at any time by pressing the P key or the key. When the therapy
time is completed, the stimulation stops automatically. The end of stimulation is indicated by a
double acoustic signal.
Switching OFF the EMP 4 PRO
Press the key to switch OFF the device. This is indicated by an acoustic signal. The
device switches OFF automatically if:
• the power supply is too low (battery mode only)
• the device has not been used for 2 minutes.

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Electrode recognition for enhanced safety
The EMP 4 PRO constantly monitors the correct connection of electrodes and cables. The
EMP 4 PRO automatically stops the stimulation if:
• an electrode detaches itself from the skin
• electrodes are not attached correctly in pairs
• electrodes are not conductive enough
• the connection between the cables and the electrodes is interrupted
• the connection between cables and device is interrupted.
The intensity then returns to 0; this is indicated by a short acoustic signal.

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Overview pre-set programs
No. PROGRAMS FOR PAIN MANAGEMENT
1 Gate Control 80 Hz*
2 Gate Control 100 Hz*
3 Endorphine 2 Hz*
4 Endorphine Burst*
5 Modulation
6 Gate Control + Endorphine*
7 Cervicalgy
8 Dorsalgy
9 Lombalgy
10 Ischialgia / sciatic pain
11 Torticollis
12 Gonarthrosis
13 Coxarthrosis
14 Epicondylitis
15 Algodystrophy
16 Hyperalgia
17 Phantom limb pain*
18 Cervicobrachial nevralgia
19 Carpal tunnel syndrome
20 Arthritis of the hand
No. PROGRAMS FOR REHABILITATION
21 Amyotrophy 1st phase*
22 Amyotrophy 2nd phase*
23 Amyotrophy prevention*
24 II A muscle fiber strengthening*
25 II AB muscle fiber strengthening*
26 II B muscle fiber strengthening*
27 Combination: active wrist joint motion
+ pain management
No. PROGRAMS FOR REHABILITATION
28 Combination: active elbow joint motion
+ pain management
29 Combination: active knee joint motion
+ pain management
30 Combination: active ankle joint motion
+ pain management
31 Combination: Hemiplegia of the
shoulder + pain management
32 Spastic limb stimulation*
33 Urology: urge incontinence
34 Urology: mixed incontinence
35 Urology: stress incontinence
36 Urology: pain control
37 Agonist/antagonist stimulation
No. VASCULAR PROGRAMS
38 Venus reflux*
39 Lymphatic drainage (heavy legs)
40 Cramp prevention*
41 Capillarisation*
No. PROGRAMS SPORT
42 Endurance*
43 Resistance*
44 Strength*
45 Explosive strength*
46 Active recovery*
47 Cleansing*
48 Relaxing percussion

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No. FITNESS PROGRAMS
49 Hypertrophy*
50 Warm-up*
51 Toning*
No. AESTHETIC PROGRAMS
52 Cellulo lipolysis*
53 Thigh-buttock firming*
54 Adipose tissue vascularisation 1*
55 Adipose tissue vascularisation 2*
No. RELAXATION PROGRAMS
56 Slow wave relaxation massage (soft)*
57 Fast wave relaxation massage (soft)*
58 Slow wave relaxation massage
(against muscle spasm)*
59 Fast wave relaxation massage (against
muscle spasm)*
60 Zip wave relaxation massage (soft)*
No. USER PROGRAMS
61 TENS continuous mode
62 Frequency modulation
63 EMS excito-motor stimulation
64 Endorphin burst stimulation
65 Massage through dynamic stimulation
(one direction)
66 Massage through dynamic stimulation
(both directions)
67 EMS agonist/antagonist stimulation
68 2+2 mode
(Ch. 1 & 2: EMS / Ch. 3 & 4: TENS)
Programs for upper and lower limbs
Programs marked with an * are programs with a possibility of upper and lower limbs stimulation
( key).See Page 9.
User programs for own settings
The EMP 4 PRO has 8 user programs. Each user program corresponds to a type of stimulation and
consists of one single sequence. The stimulation time can be set between 10 and 90 minutes.

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No. USER Program type Possible parameters
61 TENS continuous mode • Frequency (1-100 Hz)
• Impulse width (50-250 μs)
• Stimulation time (10-90 min)
62 Frequency modulation • Lowest frequency: from 1 to 100 Hz
• Highest frequency: from the lowest
frequency + 10 Hz to 100 Hz
• Impulse width (50-250 μs)
• Stimulation time (10-90 min)
63 EMS excito-motor
stimulation
• Frequency (1-60 Hz)
• Impulse width (50-350 μs)
• Rising ramp time: 2 s
• Plateau working time: 6 s
• Falling ramp time: 1 s
• Pause time: 6 s
• Stimulation time (10-90 min)
64 Endorphin burst
stimulation
• Frequency (1-100 Hz)
• Impulse width (50-200 μs)
• Rising ramp: 0.25 s
• Stimulation time (10-90 min)
65 Massage through
dynamic stimulation
(one direction)
• Frequency (1-60 Hz)
• Impulse width (50-350 μs)
• Rising ramp time: 2 s
• Plateau working time: 1 s
• Falling ramp time: 1 s
• Stimulation time (10-90 min)
66 Massage through
dynamic stimulation
(both directions)
• Frequency (1-60 Hz)
• Impulse width (50-350 μs)
• Rising ramp time: 2 s
• Plateau working time: 1 s
• Falling ramp time: 1 s
• Stimulation time (10-90 min)
67 EMS
agonist/antagonist
stimulation
• Frequency (1-60 Hz)
• Impulse width (50-350 μs)
• Rising ramp time: 2 s
• Plateau working time: 3 s
• Falling ramp time: 1 s
• Stimulation time (10-90 min)
You must first adjust the intensities of channels 1 and 2 and
then channels 3 and 4. The intensities of the active channels
flashes on the screen.
Overview user programs

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No. USER Program type Possible parameters
68 2+2 mode
Ch. 1 & 2: EMS
Ch. 3 & 4: TENS
For channels 1 and 2:
• Frequency (half of frequency from
channel 3 and 4)
• Impulse width (50-200 μs)
• Rising ramp time: 3 s
• Plateau working time: 1 s
• Falling ramp time: 3 s
• Pause time: 6 s
• Stimulation time (10-90 min)
For channel 3 and 4:
• Frequency (1-90 Hz)
• Impulse width (50-200 μs)
• Stimulation time (10-90 min)
The pulse width must be the same for
all 4 channels
Setting parameters for user programs
• Select a user program (61 to 68) depending on the desired type of therapy by pressing
the P key (see selecting a program).
• Press the key for 3 seconds to enter the setting mode.
• The first parameter to be changed flashes.
• Press the ▲ and ▼ keys of any channel to change the parameters.
• Press again to go to the next parameter.
• Press the ▲ and ▲ keys of any channel to change the parameters.
• Press again to go to the next parameter.
• Press the ▼ and ▲ keys of any channel to change the parameters.
• Press after changing the last parameter to save the changes in the user program.
Press P at any time if you want to abort the settings. The changed parameters up to that
point are then not saved.
Overview user programs

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Acoustic signal
It is possible to turn off the acoustic signal.
Simultaneously press the key and the ▼ key of channel 3 for 3 seconds to enter the
setting mode.
Press the key to turn the acoustic signal ON and OFF.
Press the P key to get back to the standard mode.
Information on total stimulation duration
The muscle stimulation unit saves the total stimulation duration.
Simultaneously press the key and ▼ key of channel 4 for 3 seconds to enter the checking
mode.
Press the key and the P key simultaneously to reset the timer to zero.
Press the P key to get back to the standard mode.
Settings, modifications and repairs
The manufacturer is only responsible for the safety and performance of the EMP 4 PRO
when settings, adjustments, alterations and repairs are carried out by authorized persons
and when the EMP 4 PRO is used in accordance with the operating instructions.
Warranty
Legal right of warranty is applied according to German Civil Code.
Guarantee
The manufacturer issues a guarantee of 12 months from the date of purchase.
The guarantee does not apply in the following cases:
- damage due to improper handling
- defects the customer is aware of on the date of purchase
- damage caused by the customer
- for wearing parts and consumable supplies like, for instance, electrodes,
batteries and cables.

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Maintenance and cleaning
No special cleaning or care agents are required for the EMP 4 PRO. Clean the unit with a
soft, fluff-free cloth. Please ensure that no moisture permeates the unit. If moisture does
permeate the unit, a technical check must be carried out before re-use.
Classification of the device
In accordance with the law on medical devices, the EMP 4 PRO is classified as being a
Class IIa medical device.
Technical check
We recommend a technical check on the EMP 4 PRO every 24 months.
This includes:
1. Confirming that user instructions have been included in the
accompanying documentation.
2. Checking the equipment for completeness.
3. Visual check:
- for mechanical damage
- for damage to all cables and sockets
4. Functional Safety
- checking the output signals with a load resistance of 1 kΩ real
current and voltage
- checking the frequency
- checking the pulse width
These technical checks may only be carried out by suitably qualified persons. The results
must be documented with the date and name of the person carrying out the check.
Delivery content
Ref. no. Article Description
104061 EMP 4 PRO
450781-0026 Rechargeable battery
104709 Main circuit adapter / charger
104769 Electrode cables set, type 7 (black, red, grey, yellow)
283400 STIMEX self-adhesive electrodes 50x50 mm
283600 STIMEX self-adhesive electrodes 50x90 mm
Transport case
101447 Instruction manual
The EMP 4 PRO may be used together with all accessories mentioned in the chapter
„Accessories“

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Accessories
The following accessories can be combined with the EMP 4 PRO.
Stimex self-adhesive electrodes
Art. No. Article
Pieces
281000 Stimex 32 mm round 4
282000 Stimex 50 mm round 4
283400 Stimex 50x50 mm 4
281032 Stimex 50x50 mm 20
283600 Stimex 50x90 mm 2
281007 Stimex 50x90 mm 4
283000 Stimex 50x130 mm 2
283100 Stimex 80x130 mm 2
281027 Stimex sensitive 50x50 mm 4
Silicone electrodes (to be used with contact gel)
Art. No. Article Pieces
107090 Silicone electrode 20 mm round 2
107060 Silicone electrode 25 mm round 2
107075 Silicone electrode 40x28 mm 2
107035 Silicone electrode 56x28 mm 2
107020 Silicone electrode 75x30 mm 2
107055 Silicone electrode 90x35 mm 2
107011 Silicone electrode 38x45 mm 2
107010 Silicone electrode 48x48 mm 2
107050 Silicone electrode 70x65 mm 2
107070 Silicone electrode 70x140 mm 2
108000 Contact gel for silicone electrodes (60 g) 1

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MedicoBack
For the treatment of low back pain
Low back support bandage with pelotte and integrated electrodes to be
used with pain management programs of the EMP 4 PRO.
MedicoBack P-type offers patients lumbar vertebrae stabilization
and support as well as easy stimulation provided by the integrated
electrodes. The pelotte with its massage nubs enhances the pain
relieving effect. MedicoBack P-type may be used for slight or acute pain
as well as for chronic pain in the lower back area.
Art. No. Article Size Length
107034 MedicoBack P-type S 80 - 90 cm
107036 MedicoBack P-type M 90 - 100 cm
107037 MedicoBack P-type L 100 - 110 cm
107038 MedicoBack P-type XL 110 - 120 cm
107039 MedicoBack P-type XXL 120 - 130 cm
Stimex garment electrodes: gloves and socks
The gloves and socks used in combination with the EMP 4 PRO provide
stimulation of the entire hand and/or foot and ankle and avoid the
sometimes tiresome attachment of self-adhesive electrodes on the hand
or the foot.
Gloves
Art. No. Article Size Pair
107014 Stimulation gloves S 1
107021 Stimulation gloves M 1
107022 Stimulation gloves L 1
Socks
Art. No. Article Size Pair
107023 Stimulation socks M 1
107024 Stimulation socks L 1

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Vaginal probes
To be used with URO programs only
Art.-No. Article Pieces
101471 Vaginal probe V21B (type 7) 1
V21B
25 mm Ø
10 10
Länge 95 mm
length
Cables
104765 Pair of electrode cables type 7 (black)
104766 Pair of electrode cables type 7 (red)
104768 Pair of electrode cables type 7 (grey)
104767 Pair of electrode cables type 7 (yellow)
Setting of intensity levels
Do not try to achieve a higher and higher level of intensity. Set the intensity in such a way
that you get a comfortable feeling during the stimulation. Increase the intensity carefully
to a maximum tolerable and then reduce it slightly step by step to a comfortable level.
Note that the intensity settings change depending on the stimulation area and the time.
This is normal and can be explained as follows:
• Resistance of the skin:
Dry skin has a lower conductivity level than damp skin (due to sweating). The skin does
not show the same resistance to linear current on all parts of the body. For example,
the resistance level of horny skin can be twice that of the skin in the hollow of the
knee. The innervation differs greatly according to the area of the body. This results in a
difference of sensitivity.
• Volume of the muscle mass:
If you stimulate muscles with a high volume you will automatically need to set a higher
intensity than for the stimulation of small muscles.