Vascular lesion treatment laser Spider

pigmented lesion treatmentNd:YAGdiode

Overview
Multiple diode lasers are available for treatment of telangiectasias and small veins. Systems can emit infrared light at wavelengths including 810 nm, 940 nm, and 980 nm; these wavelengths are absorbed by hemoglobin peaks and can be effective for leg telangiectasia. Longer diode wavelengths penetrate more deeply than yellow light and are less absorbed by melanin, while still providing hemoglobin absorption. The 980 nm diode laser can be used safely on patients with skin types I to IV.

Leg telangiectasia
The 810 nm pulsed diode, when used with a fluence of 80–100 J/cm2, a 12 mm spot size and a 60 ms pulse duration, produced complete clearance of leg vessels in 15 of 35 patients after a single treatment; at 6-month follow-up 6 patients maintained complete resolution. The 940 nm diode showed limited effect on very small vessels but improved larger visible leg veins (0.8–1.4 mm) in clinical studies. In one study, 12 of 26 patients treated with the 940 nm diode at fluences of 300–350 J/cm2, 40–70 ms pulse durations, with a 1 mm handpiece demonstrated >75% clearance after 4 weeks. Another study of 20 patients using a single pass of the 940 nm diode at 300–350 J/cm2, 40–70 ms pulse duration and a 1 mm spot achieved >75% clearance of treated vessels in 75% of patients at 12 months.

Facial telangiectasia and pigmented lesions
For facial telangiectasias and some pigmented lesions, the 532 nm (frequency-doubled Nd:YAG / green light) diode laser has high absorption by oxyhemoglobin and also significant melanin absorption. This makes 532 nm effective for facial telangiectasia and minor vascular lesions, but caution is required on darker skin to avoid epidermal injury. 532 nm systems are often portable and use small, precise handpieces suited to office-based cosmetic practice.

Clinical notes
Choice of wavelength, fluence, pulse duration, and spot size affects penetration, hemoglobin absorption, and risk to epidermis. Longer diode wavelengths (e.g., 980 nm) penetrate deeper and are less absorbed by melanin; 532 nm is strongly absorbed by oxyhemoglobin and melanin and is useful for precision work on facial vessels and some pigmented lesions.

Related items / resources

• Endovenous laser ablation (EVLA) and EVLT information
• Training and professor-led courses (training resources)
• Purchase options for Velas diode laser systems
• Product brochure (vein treatment brochure)

Caractéristiques / spécifications techniques

• Wavelengths cited: 532 nm (green), 810 nm, 940 nm, 980 nm
• Applications: leg telangiectasia, facial telangiectasia, pigmented lesions
• 810 nm example parameters: fluence 80–100 J/cm2, spot size 12 mm, pulse duration 60 ms
• 940 nm example parameters/studies: fluence 300–350 J/cm2, pulse duration 40–70 ms, 1 mm handpiece or spot; effective on 0.8–1.4 mm veins in studies
• 980 nm: deeper penetration, limited but significant hemoglobin absorption; safe for skin phototypes I–IV (per text)
• 532 nm (DP FD Nd:YAG): high oxyhemoglobin and melanin absorption; portable solid-state devices and small handpieces suited for precision tracing of individual telangiectasias
• Clinical outcomes reported: single-treatment complete clearance in some patients (study examples), and longer-term follow-up showing variable maintenance of clearance