The primary function of the 4.5mm transducer is to target the face's structural foundation, specifically the Superficial Muscular Aponeurotic System (SMAS) and the platysma muscle. By delivering focused ultrasound energy to this precise depth, it mimics the anatomical targets of surgical facelifts to induce lifting without cutting the skin.
Micro-focused Ultrasound (MFU) at 4.5mm bypasses the surface of the skin to heat deep tissue to temperatures exceeding 60°C. This specific thermal action contracts the fibrous muscle layer and triggers the body's natural regenerative processes to tighten and lift facial architecture.
The Anatomy of a Non-Invasive Lift
Targeting the SMAS Layer
The 4.5mm depth is critical because it reaches the Superficial Muscular Aponeurotic System (SMAS).
This fibromuscular layer is the exact structure surgeons tighten and manipulate during a traditional surgical facelift.
By targeting the SMAS non-invasively, the 4.5mm transducer addresses skin laxity at its structural root rather than just treating the surface.
Addressing the Platysma
Beyond the face, this transducer is effective for neck rejuvenation.
It targets the platysma muscle, the sheet of muscle extending from the chest up the neck.
Tightening this layer helps redefine the jawline and reduce the appearance of neck laxity.
How Thermal Energy Creates Lift
Controlled Thermal Injury
The transducer utilizes high-intensity acoustic waves to create controlled zones of thermal injury.
It raises the local tissue temperature to over 60°C, a critical threshold for structural change.
These thermal coagulation points are precise, typically measuring less than 1mm³, ensuring the surrounding tissue remains intact to aid healing.
Collagen Denaturation and Contraction
When exposed to this specific heat, existing collagen fibers undergo denaturation.
This process causes the collagen fibers to contract immediately, providing an initial tightening effect.
Neocollagenesis
The thermal injury triggers a biological repair mechanism known as neocollagenesis.
Over the weeks following the procedure, the body produces new, stronger collagen fibers.
This creates a long-term lifting and tightening effect that improves the skin's structural integrity.
Understanding Precision and Safety
Avoiding Surface Damage
A key advantage of the 4.5mm MFU transducer is its ability to bypass the epidermis.
The energy passes through the skin's surface without affecting it, depositing the thermal load only at the intended deep focal point.
The Role of Visualization (MFU-V)
Because this energy is delivered deeply, precision is paramount to avoid complications.
Systems equipped with visualization (MFU-V) allow clinicians to see anatomical layers in real-time.
This ensures the energy hits the SMAS while strictly avoiding bones and major blood vessels, significantly enhancing safety.
Making the Right Choice for Your Goal
The 4.5mm transducer is a specialized tool designed for structural lifting rather than surface refinement.
- If your primary focus is significant lifting: The 4.5mm transducer is essential as it tightens the foundational SMAS layer that supports the face.
- If your primary focus is safety and precision: Ensure your provider utilizes MFU with visualization to guarantee the energy targets the muscle fascia and avoids critical neurovascular structures.
By stimulating the body's own repair mechanisms at a surgical depth, the 4.5mm transducer offers a restorative solution for aging skin without the downtime of surgery.
Summary Table:
| Feature | 4.5mm MFU Transducer Specifications |
|---|---|
| Target Depth | 4.5mm (Subcutaneous Fat & SMAS Layer) |
| Primary Target | Superficial Muscular Aponeurotic System (SMAS) |
| Thermal Effect | Precise coagulation points > 60°C |
| Biological Action | Immediate collagen contraction & Neocollagenesis |
| Main Benefits | Structural lifting, jawline definition, neck tightening |
| Safety Feature | Bypasses epidermis to prevent surface thermal damage |
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References
- Julie A. Woodward, Betsy Colón-Acevedo. Safety and Efficacy of Combining Microfocused Ultrasound With Fractional CO2 Laser Resurfacing for Lifting and Tightening the Face and Neck. DOI: 10.1097/dss.0000000000000228
This article is also based on technical information from Belislaser Knowledge Base .
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