What IF? IF 4000 Interferential Units

if 4000

Interferential units like the IF 4000 stimulator are used to provide interferential therapy, otherwise known as IF therapy. Interferential stimulation can relieve the symptoms of chronic and acute pain by sending small electrical impulses through the skin and into the area of pain. This causes a mild, tingling yet comfortable sensation. This sensations blocks pain signals so that they do not reach the brain. The IF 4000 is a dual channel unit, meaning that it can work with one or two pairs of electrode pads to provide better scope and distribution of stimulation. IF therapy is a symptomatic treatment; that is, it relieves the painful symptoms but doesn’t address the source of the pain. Results may vary; in some cases pain relief outlasts stimulation, and in others pain is only relieved when stimulation is taking place.


IF 4000





Adverse reactions

Symptomatic relief and management of chronic and acute pain.


Myocardial arrhythmia (without doctor evaluation).

Over carotid sinus nerves, laryngeal, or pharyngeal muscles.

Undiagnosed syndromes.


For external use.

Safety during pregnancy or delivery not established.

Use only under medical supervision.

Ineffective for pain of central origin.

No curative value.

Don’t apply on the eye area.

Avoid stimulator control changes while operating heavy machinery.

Keep away from children.

Consult doctor for treatment times and frequency.

Discontinue use in case of adverse reaction.

Long-term application may seldom lead to skin irritation in electrode placement sites.

Effectiveness is directly related to patient selection.

Potential skin irritation or electrode burn under electrode.

Potential allergic reaction to tape or gel.




Electrodes switch

Slides to the left for one pair of electrodes and to the right for two pairs of electrodes.

Mode selector switch

Alters sequence of stimulation from a regular waveform to an irregular one to provide alternative modes and improve treatment and comfort.

Power on indicator light

Indicates whether unit is on or off.

Low battery indicator light

Indicates battery level; amber to indicate replacement is necessary; off to indicate battery is depleted.

Frequency control

Turn dial to set frequency instructed by doctor.

Amplitude control

Turn clockwise to control strength of stimulation delivered through both channels.

Adapter receptacle

May be used instead of battery.

Output sockets

Insert lead cable plugs here; one pair of electrodes per socket.


Instructions for use:

·         Step 1. Make sure unit is turned off.

·         Step 2. Clean, rinse and dry skin with mild soap and water.

·         Step 3. Check battery to make sure it’s fresh.

·         Step 4. Prepare electrodes according to instructions included with the product.

·         Step 5. Connect electrodes to lead wires.

·         Step 6. Place electrode pads as instructed by your doctor.

·         Step 7. Connect lead wires to output sockets.

·         Step 8. Set frequency dial to position indicated by your physician.

·         Step 9. Slowly turn on amplitude control to desired strength.

·         Step 10. When treatment time is over, turn amplitude control counter-clockwise to turn unit off, disconnect lead wires, and remove electrode pads from skin.

Interferential units may be used with three different types of electrodes:

·         Reusable electrodes.

·         Disposable electrodes.

·         Carbon rubber electrodes.



Though they can be remoistened with a few drops of water, they lose adhesiveness with repeated use (delivering less stimulation and shortening battery life) and must be placed as necessary.


Use a solid polymer gel and include a built-in patch. Can be worn in the shower. Must be replaced when not adhering well or failing to deliver stimulation.

Carbon rubber

Must be cleaned with mild soap and water between uses. Must be replaced approximately every 6 months as they begin to deliver less stimulation.

The IF 4000 can deliver stimulation through one pair of electrodes connected to one channel, or through two sets of electrodes at the same time, connected to the two channels.

Channel 1

Channel 2


Connect lead wire to socket, set electrode switch to ‘two electrodes position’ (no stimulation will be delivered from channel 1).

Connect lead wires to both sockets, set electrode switch to ‘four electrodes position.’


IF is not mutually exclusive with other forms of electrotherapy such as TENS, EMS, and Russian Stimulation. On the contrary, they all are so compatible with the others that each can find an equal space in hybrid devices like the CareTec IV.