A specific needle depth of 1.5mm is required to penetrate the epidermal barrier and accurately reach the dermis. For abdominal striae (stretch marks), this depth is critical because it stimulates collagen remodeling within the structural layer of the skin while avoiding injury to deeper tissues. This specific measurement strikes the necessary balance between clinical efficacy and patient safety.
Core Takeaway The 1.5mm depth is the precise biological threshold required to bypass the outer skin layer and trigger structural repair in the dermis. It maximizes collagen production for stretch mark reduction while preventing unnecessary damage to the subcutaneous tissue or vascular networks.
Targeting the Source of the Problem
Penetrating the Epidermal Barrier
Stretch marks are not merely surface blemishes; they are structural issues located deep within the skin.
To treat them effectively, the needles must physically bypass the epidermis, the skin's protective outer shell.
A depth of 1.5mm ensures the needle tips successfully cross this barrier.
Reaching the Dermis
The primary target for treating striae is the dermis.
This is the layer where collagen and elastin—the proteins responsible for skin strength and elasticity—are located.
By setting the depth to 1.5mm, the device accurately targets this layer to initiate repair where the tissue tear actually exists.
The Mechanism of Action
Inducing Collagen Remodeling
Mere penetration is not the goal; the objective is stimulation.
At 1.5mm, the needles create controlled micro-injuries that trigger the body's natural wound-healing response.
This process forces the skin to produce new collagen, known as collagen remodeling, which tightens the skin and reduces the appearance of the stretch marks.
Optimizing Treatment Efficiency
The use of this specific depth is often paired with high-density pin configurations (such as 36-pin cartridges).
This combination increases the coverage rate of micro-injuries.
It ensures that the stimulation is uniform across the treatment area, leading to more consistent results.
Understanding the Trade-offs
Avoiding Deep Tissue Injury
While depth is required for efficacy, excessive depth poses safety risks.
Going significantly deeper than 1.5mm on the abdomen risks injury to the subcutaneous fat or deeper vascular networks.
The 1.5mm setting acts as a safety guardrail, preventing damage to tissues that do not require treatment.
The Limitation of Shallower Depths
It is important to understand why a shallower needle (e.g., 0.5mm) is insufficient for this specific condition.
A 0.5mm depth is ideal for sensitive areas or targeting pigmentation (melanocytes) at the dermo-epidermal junction.
However, it is too shallow to induce the deep structural remodeling required to repair abdominal striae.
Making the Right Choice for Your Goal
Selecting the correct needle depth is not about preference; it is about matching the physics of the device to the biology of the skin condition.
- If your primary focus is Structural Repair (Striae): You must use a 1.5mm depth to reach the dermis and trigger the collagen production necessary to repair the scar tissue.
- If your primary focus is Product Absorption or Pigment: A shallower depth (0.5mm) is preferable to minimize pain and target the epidermal junction without affecting deep structure.
Precision in needle depth is the single most important factor in achieving visible results while maintaining the safety profile of the treatment.
Summary Table:
| Feature | 0.5mm Depth | 1.5mm Depth (Target) |
|---|---|---|
| Primary Target | Epidermis / Dermo-epidermal junction | Dermis (Structural layer) |
| Clinical Focus | Pigmentation & Product Absorption | Structural Repair & Striae |
| Mechanism | Superficial stimulation | Deep Collagen Remodeling |
| Suitability | Sensitive areas / Glow treatments | Abdominal Stretch Marks |
| Safety Profile | Lowest risk of bleeding | Optimal balance of safety & efficacy |
Elevate Your Clinic’s Results with BELIS Medical Precision
As a professional clinic or premium salon, your reputation relies on delivering visible, safe results for complex skin concerns like abdominal striae. BELIS specializes in professional-grade medical aesthetic equipment, including our advanced Microneedle RF and high-density needle systems designed for precision depth control.
By choosing BELIS, you gain access to cutting-edge technology—from Nd:YAG and Pico lasers to HIFU and Body Sculpting solutions (EMSlim, Cryolipolysis)—all engineered to maximize patient satisfaction and ROI. Our specialized care devices, including skin testers and Hydrafacial systems, ensure you can provide a comprehensive treatment journey.
Ready to upgrade your treatment protocols with industry-leading precision?
Contact our specialists today to find the perfect system for your practice.
References
- M.Sc. NERMEEN S. ABDEL FATTAH AMIRA S. ABDELSAMIEA, Mohamed Nada. Microneedling With and Without Vitamin C versus Fractional CO2LASER in Treating Abdominal Striae Distensae Alba: A ComparativeClinical and Histopathological Study. DOI: 10.21608/mjcu.2021.153791
This article is also based on technical information from Belislaser Knowledge Base .
Related Products
- RF Microneedling Machine Micro Needle Radio Frequency Machine
- Pico Picosecond Laser Machine for Tattoo Removal Picosure Pico Laser
- Pico Laser Tattoo Removal Machine Picosure Picosecond Laser Machine
- Hydrafacial Machine Facial Clean Face and Skin Care Machine
- Fractional CO2 Laser Machine for Skin Treatment
People Also Ask
- What is the key physical function of Radiofrequency Microneedling for hyperhidrosis? Achieve Permanent Sweat Reduction
- Why combine subcision and lasers for rolling scars? Unlock Superior Results with Dual-Action Remodeling
- Who is considered an ideal candidate for RF microneedling? Discover Your Suitability for Skin Transformation
- What is the role of Radiofrequency (RF) devices with PRP for striae distensae? Boost Synergy for Stretch Mark Repair
- What is radiofrequency microneedling? Advanced Skin Rejuvenation & Deep Collagen Remodeling Guide
