Introduction to ELŌS™
ELŌS stands for Electro-Optical Synergy. It is the comer stone of the eStyle system for hair removal, for treatment of pigmented and vascular lesions, acne and wrinkles. Electro represents the bipolar radio frequency current (RF), while Optical represents the pulsed light. Both the RF and pulsed light energies are emitted to the skin from a chilled applicator tip. The synergy that occurs between the impacts of the RF and light offers a remarkable new way for treatment of cutaneous skin indications. Traditional light sources have long been used for photothermolysis of targets in the skin. Hair removal, pigmented lesion removal, vascular lesion removal, non-ablative skin rejuvenation or dermal remodelling are examples of indications that are successfully treated by a variety of wavelengths and filtered spectrum light.
Common issue in traditional laser or light source
A common issue in treatments performed by traditional laser or light source is two-fold: 1. Not enough light energy absorbed by the target means less efficacy. 2. Too much light energy absorbed by non-target tissue means collateral damage or unwanted side effects, usually to the epidermis or dermis.
ELŌS presents a solution for both problems; since the light and the RF play equal but different roles in the formula, by reducing one and increasing the other, efficacy will not be compromised for safety, and safety will not be compromised for efficacy. How can this be achieved?
Pulsed Light is selectively absorbed by the target and is converted to thermal energy, resulting in targets heated to a higher temperature. This is depicted by the red arrows that transmit downward into the skin (see Figure 2-l). The objective is to heat the target (hair follicle, acne, vascular or pigmented lesion, or collagen fibres), which will lower the impedance or resistance of that target.
RF Current flows from one electrode to another, and will gently heat everything in its pathway. This is depicted by the green arrows that curve in the dermis (see Figure 2-1). RF current, like all other electrical energies, will travel along the path of higher conductivity or least resistance. When targets are pre-heated by the pulsed light, they have lowered impedance or low resistance. The RF current density will be higher in those areas of lower impedance (pre-heated targets), resulting in further thermal injury to the target. This completes the thermolysis impact that is necessary for the desired biologic effect * such as follicles to stop growing hair, or vascular and pigmented lesions to fade.
At the same time, the epidermis is chilled by the cooled applicator tip and its impedance rises. This results in less RF current flowing through the epidermis for enhanced safety, and in penetration of the electrical current into the deeper and pre-heated areas in the skin.
Figure 2-1: Pulsed Light and RF Energies
Figure 2-2: eStyle System
In addition to contributing to thermolysis of dermal targets, the RF current also acts as an indirect "thermometer" in the dermis. During the application of RF energy, the device measures changes in the skin's impedance. There is an inverse relationship between changes in temperature and impedance; rising temperature correlates with a drop in impedance. This allows the eStyle to perform active dermal monitoring for hair removal and skin rejuvenation applications, offering the user a "smart" device with a unique safety mechanism.