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TENS Unit Frequently Asked Questions


FAQs on TENS Units


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FAQs on TENS Units

What is TENS?

TENS is short for Transcutaneous Electrical Nerve Stimulation. The TENS generates electrical impulses that are sent through electrodes placed over nerve centers. The various pulses employed by TENS can block pain signals normally sent to the brain through nerve fibers, thereby interrupting the brain's awareness of pain. The TENS may activate the release of endorphins. These are chemicals in the control system used by the body to suppress pain naturally. It is no longer necessary for many people to endure chronic or constant pain. The use of TENS usually improves pain management significantly. TENS is safe, non-invasive, drug free, non-addictive and has no side effects. The TENS can reduce the need for pain narcotics and drugs.   Federal law restricts these devices to sale by or on the order of a physician.  TENS is a FDA regulated non-narcotic pain relief device.

How does TENS work?

TENS works by two different methods. High frequency TENS, is based on the theory that continuous mild electrical activity blocks the pain signal traveling to the brain. If the pain signal does not get through to the brain, the pain is not "felt". The second way TENS works is by stimulating the body's own natural pain-control mechanism. Low frequency or short bursts of electrical activity causes the body to release its own pain relieving substances, called endorphins.  

How easy is it to use TENS?

Using a TENS is very easy. It is portable and may be clipped to a belt, shirt pocket, bra or other clothing.

What is the difference between the CENTURY 2400, ARISTA 2000, ARISTA SD+ and CENTURY 2100?  

The CENTURY 2400 is a preset unit used for acute pain. It is usually used for a short period of time. i.e. broken ankle

The ARISTA 2000 is a multi-modulated unit. It is used for a chronic pain patient who wears the unit for a substantial amount of time per day. The ARISTA 2000 is for someone who needs a modulated frequency so the body can't accommodate. The body can't figure out the frequency and override it because the frequency is constantly changing.

The CENTURY 2100 is used when a Doctor prescribes a specified timed treatment. It is used with a patient who wears the unit during all working hours.  This is the only TENS that comes with a timer option.

The Arista SD+ is the only TENS unit that gives you the option of using an AC Adaptor or 9 Volt Battery.  This is the only TENS where the channels can be controlled independently.   

How does Interferential therapy differ from TENS?  

Interferential differs from conventional Neuromuscular stimulation and TENS in that it delivers concentrated stimulation deep into the affected tissue. Interferential exploits the interference of two separately generated sinusoidal currents applied to the body simultaneously.  It is a low frequency current treatment that uses two medium frequency currents which "interfere"  with each other to produce a beat frequency that the body recognizes as a low frequency energy source.  The range of this frequency is usually 1-250 Hz.  The body itself produces low frequency currents between 1 and 256 Hz.  These currents are produced across the cell membranes by ionic exchange, and they will vary depending upon the tissue involved.  By using frequencies in this range, different systems within the body can be stimulated.

How does a TENS differ from a Muscle Stimulator? 

TENS is designed to help relieve certain types of chronic and acute pain. A Muscle Stimulator is used for muscle tension, stiffness in joints or back areas, increasing motion restricted from disuse or atrophy and for increasing local blood circulation.

What are some of the conditions for which TENS units are used?

 Please CLICK HERE For Possible TENS Applications


Consumer Product Use Warning

TENS & EMS units and other units on the Medword site are sold with the understanding that the consumer will only use the products for their intended purpose. Medword, its agents, suppliers, and manufacturers only warrant that these units will perform the functions stated. No medical cure should be inferred and Medword does not hold forth that these units will perform any other physical effect than that which is stated. For user safety and optimum results, we strongly recommend the usage of these units and placement of electrodes be under the supervision of a Chiropractor, Podiatrist, Physical Therapist, Doctor of Osteopathy, Medical Doctor, Dentist, Nurse Practitioner, PH.D., or Doctor of Acupuncture. Units should not be used if the person has: a pacemaker; a heart condition; epilepsy, and/or; is pregnant.

  1. Do not use electrical stimulation over carotid sinus nerves (throat), eyes, or nose.
  2. The long-term effects of chronic use of electrical stimulation are unknown.
  3. This device is a symptomatic treatment and suppresses the sensation of pain, which would otherwise serve as a protective mechanism.
  4. Do not immerse device in water or other liquids.
  5. The use of heat or cold producing devices, such as electric heating blankets, heating pads, or ice packs, may impair the performance of the electrode or alter the patient's circulation/sensitivity and increase the risk of injury to the patient.
  6. Units should not be used if the person has: a pacemaker; heart condition; epilepsy, and/or; is pregnant.

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Electrode Skin Prep
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Electrode Skin Prep
2 Fluid Oz. Bottle

Recommended For Use
With All Electrodes

Medword Price
12.99
TENS Conductive Spray
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TENS Conductive Spray
2 oz. Bottle

Recommended For Use
With All Electrodes

Medword Price
14.99
Tac Gel
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Tac Gel 2 oz. Tube

Recommended For Use
With No-Gel Electrodes

Medword Price
14.99

TENS & EMS Units as Therapy:

TENS (Transcutaneous Electrical Nerve Stimulator) units, EMS (Electronic Muscle Stimulator) units are an accepted form of therapy by Western medicine in the treatment of specific musculoskeletal conditions. These units are commonly used by medical doctors, medical rehabilitation specialists, and medical physiotherapists to treat specific symptoms. These professionals often "prescribe" where the TENS electrodes & EMS electrodes should be placed on the body. Please refer to the bibliography of medical citations in our article found here. Always consult a licensed physician before starting any type of medical therapy.


Supplier Guarantee & Return Policy

Medword Medical Sales, through our supplier, guarantees 100% customer satisfaction. If you are not 100% satisfied with the results you are receiving from your EMS or TENS machine or electrodes, as long as the order is returned in good condition within 30 days, you will be issued a full refund. Medword's supplier is the low-price leader and promises to match all competitors prices. The TENS units and EMS come with a 5 Year Warranty. If you are having any problems with your EMS or TENS unit, send it back to our supplier and a new replacement unit will be shipped out to you immediately.






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