A detailed research-based overview on the depths of HIFU (High-Intensity Focused Ultrasound) cartridges and their effectiveness for facial and body treatments:

🔍 1. Overview of HIFU Technology

HIFU is a non-invasive aesthetic treatment that uses focused ultrasound energy to stimulate collagen production in the skin's foundational layers, resulting in skin lifting, tightening, and contouring.

It delivers energy at specific depths, causing thermal coagulation points that trigger a natural healing response.

📏 Typical HIFU Cartridge Depths & Treatment Areas

🧠HIFU Therapy Effectiveness by Depth & Area

✅ Face

• 1.5 mm: Best for fine lines and crow's feet.

• 3.0 mm: Improves skin elasticity, suitable for midface lifting.

• 4.5 mm: Targets SMAS layer, providing a non-surgical facelift effect — the most critical depth for facial lifting.

Clinical studies show noticeable improvement in facial laxity at 3.0 mm and 4.5 mm depths, with results peaking after 8–12 weeks.

✅ Neck & Double Chin

• 3.0 mm & 4.5 mm: Tightens sagging skin and defines jawline.

• 6.0 mm: Helps reduce submental fat under the chin.

✅ Body

• 6 mm, 8 mm, 10 mm, 13 mm: Ideal for fat reduction and skin tightening in areas like abdomen, thighs, flanks, and upper arms.

• Effective in breaking down fat and contracting collagen fibers to firm skin.

Body HIFU shows best results after multiple sessions spaced 4–6 weeks apart.

📊 Scientific Evidence

• A 2015 study published in Lasers in Surgery and Medicine showed significant lifting and wrinkle reduction at 4.5 mm in the face.

• Another clinical trial in Dermatologic Surgery (2018) showed fat layer thickness reduction of up to 3.5 mm after 12 weeks using 6 mm and 9 mm cartridges for abdominal areas.

⚠️ Considerations

• Depth selection must be based on skin thickness and treatment goals.

• Deeper cartridges (6–13 mm) should be avoided on thin or bony areas.

• Not suitable for clients with very low body fat in treated areas.

✅ Summary Chart