TENS FAQ

General Pain Relief using TENS

Q: What is Comfort Strength Control?

Comfort Strength Control is a new feature of the TensCare itouch units and gives a new combination of constant current and constant voltage strength control designed to maximise the advantages of both forms, giving predictable,  repeatable, and comfortable treatment.

Practical experience has shown that these features improve compliance and outcome in trials of TENS.

Why is current important?
TENS is intended to stimulate nerves. It is the current flowing through the tissue along the nerve that does this.

What is the difference between Constant Current and Constant Voltage?
Ohms law states that VOLTAGE = CURRENT x RESISTANCE

Most standard TENS units are constant voltage. This means that as the resistance of the skin and electrode pads change, the current will change. Sometimes this does not matter too much:- as the pads absorb moisture from the skin the resistance will change. The patient responds by adjusting the strength control. However, if pressure is applied to the pad, the current can increase rapidly and there is a risk of causing pain to the patient. With constant current, the unit measures the resistance and adjusts the voltage so that the current stays the same.

Advantages of Constant Current
Output is fixed, predictable, and repeatable.
More comfortable for patient
Allows for additional features such us the One Touch Memory Start feature which aids with patient compliance.
Quantified dosage numbers for research and recording for Evidence Based Practice

Disadvantage of Constant Current
If the unit were not switched off before the pads were removed, it could cause discomfort. As a pad loses contact, the output would be increased to maintain the current. This current would be concentrated into a smaller and smaller area, and could be a quite unpleasant sensation.

Comfort Strength Control
CSC overcomes this disadvantage. If the resistance becomes too high, the unit switches to Constant Voltage control, preventing the discomfort associated with constant current. This sophisticated combination of technologies ensures optimum patient comfort.

Other questions in this category

Back to main FAQ