The distinction between D-Pulse and S-Pulse modes centers on penetration depth and the resulting thermal reaction. Surface Pulse (S-Pulse) targets the superficial layers to maximize coagulation, whereas Deep Pulse (D-Pulse) targets the deeper dermal layers to drive structural tissue contraction.
Effective eyelid treatment requires matching the pulse mode to the specific anatomical target. S-Pulse is designed for surface-level coagulation in the papillary dermis, while D-Pulse provides the deep structural tightening necessary for treating laxity in the reticular dermis.
Surface Pulse (S-Pulse): Superficial Interaction
Targeting the Papillary Dermis
The S-Pulse mode is engineered to interact primarily with the papillary dermis. This is the uppermost layer of the dermis, sitting just below the epidermis.
Ablation Shape and Thermal Effect
When S-Pulse is applied, it creates a circular ablation shape.
The primary biological effect of this mode is coagulation. The energy distribution emphasizes coagulating the tissue surrounding the ablation point, making it highly effective for surface-level interaction.
Deep Pulse (D-Pulse): Structural Tightening
Targeting the Reticular Dermis
In contrast, the D-Pulse mode bypasses the superficial focus to penetrate into the reticular dermis. This is the thicker, deeper layer of the skin responsible for structural integrity.
Ablation Shape and Thermal Effect
The interaction in the reticular dermis results in a distinct reaction: greater contraction of the ablation columns.
Unlike the broad coagulation of S-Pulse, the D-Pulse mode creates localized zones of coagulation. This focus allows for significant tissue tightening without excessive lateral thermal spread.
Understanding the Trade-offs
Coagulation vs. Contraction
The core trade-off involves choosing between surface modification and deep tightening. S-Pulse sacrifices depth to create a broader zone of coagulation, which is beneficial for treating the immediate subsurface.
Depth vs. Localization
Conversely, D-Pulse sacrifices the broad surface coagulation to achieve depth. By localizing the coagulation zones deep in the tissue, it prioritizes the mechanical contraction required to address significant skin laxity.
Making the Right Choice for Your Goal
Selecting the correct pulse mode allows for a customized approach to treating wrinkles and skin laxity.
- If your primary focus is surface modification: Utilize S-Pulse to target the papillary dermis with a focus on broad coagulation.
- If your primary focus is structural tightening: Utilize D-Pulse to penetrate the reticular dermis and induce contraction of the ablation columns.
By understanding the depth and thermal profile of each mode, you can precisely tailor the treatment to the patient's specific skin condition.
Summary Table:
| Feature | Surface Pulse (S-Pulse) | Deep Pulse (D-Pulse) |
|---|---|---|
| Target Layer | Papillary Dermis (Superficial) | Reticular Dermis (Deep) |
| Ablation Shape | Circular | Columnar |
| Primary Effect | Broad Coagulation | Structural Contraction |
| Clinical Goal | Surface Modification | Deep Tissue Tightening |
| Energy Focus | Lateral Thermal Spread | Localized Depth Penetration |
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References
- Paolo Bonan, Giuseppe Rampino. Laser‐assisted blepharoplasty: An innovative safe and effective technique. DOI: 10.1111/srt.13351
This article is also based on technical information from Belislaser Knowledge Base .
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