Various energy devices such as radiofrequency (RF), HIFU, and lasers have been released for skin laxity treatments, expanding clinics’ options year by year. However, systematically organizing “which layer each device targets” and “differences from conventional devices” is not straightforward. In this webinar, Dr. Miyata, who has extensive experience with RF treatments, explained the fundamental theory of RF tightening treatments, the positioning of capacitively coupled RF, and the features and clinical applications of the new RF device “DENSITY,” which combines monopolar and bipolar technologies.
- INDEX
Fundamentals of RF Heating and the Evolution resulting from “Capacitive Coupling” (1:40-)
High-frequency tightening works on a simple principle of thermal damage and wound healing, yet the mechanisms of heat generation vary. The human body exhibits both conductive and dielectric properties, while Joule heating (heating by current) and dielectric heating (heating by electric field) combine depending on the frequency. Capacitively coupled RF employs a technique called “impedance matching” to predominantly generate Joule heating while delivering energy deep into the tissue. By matching the impedance between the electrode and the skin, it suppresses surface reflection, enabling precise heating of fibrous connective tissue. This mechanism achieves the core function of RF: deep three-dimensional contraction.
Features of DENSITY: Sequential Irradiation of Monopolar × Bipolar (2:30-)
DENSITY shares the basic specifications of conventional RF systems, but its key feature is the ability to utilize monopolar and bipolar modes within a single irradiation. Monopolar energy acts deeply in a 3D manner on fibrous connective tissue, while bipolar energy concentrates on the upper dermis. Compared to conventional bipolar RF, DENSITY’s bipolar energy penetration depth is significantly enhanced by its capacitive coupling structure. Furthermore, “Sequential Pulse Heating” has been confirmed to greatly promote collagen/elastin production over single-mode irradiation. This approach, which heats the deeper layers first before targeting the surface, shares the same principle as the e-los technology used in Photo RF, making it an extremely logical method for skin tightening.
Clinical Protocol and Actual Effect
The key advantage of Density is its ability to treat both deep and superficial layers simultaneously. I gradually build heat with 300 monopolar shots, then add 100 to 150 additional Monopolar Bipolar shots. I avoid high output, instead accumulating heat through speed and overlapping shots. This minimizes discomfort while delivering solid results that satisfy patients. In actual cases, mild tightening is visible immediately after treatment, and a clear reduction in facial volume is evident after three weeks. Treatment time is short—about 15 minutes for 450 shots—and the cost is relatively low.
The Potential of the New “Alpha” Tip and New Options Brought by DENSITY (24:10-)
The newly developed Alpha Tip features a larger electrode surface area than existing High Tip, designed to deliver heat evenly from superficial to deep layers. Monopolar targets deeper layers, High Tip focuses more on superficial layers, while the Alpha Tip covers both. While it doesn’t produce the intense heat sensation of conventional RF, its combination of tolerability, immediacy, and reliable deep heating offers significant value in clinical practice. These expanded tip options broaden the possibilities for RF treatment tailored to patient needs, delivering effective results while reducing discomfort.
