Prospective Clinical Evaluation of 1440-nm Laser Delivered by Microarray for Treatment of Photoaging and Scars
June 2006 | Volume 5 | Issue 8 | Original Article | 740 | Copyright © June 2006
Robert A. Weiss MD, Michael Gold MD, Natalie Bene MD, Julie A. Biron, Girish Munavalli MD, Margaret Weiss MD, Karen Beasley MD
Background and Objectives: The use of thermal heating in microscopic zones is generically termed “microrejuvenation.” The
objective of this study was to evaluate the benefits of using a novel 1440-nm Nd:YAG laser (Affirm™, Cynosure, Westford,
MA) with a novel approach for microscopic heating. This device utilizes a microarray of lenses delivering a 10-mm beam as
hundreds of high-fluence beamlets interspersed with a relatively uniform low-fluence background irradiation.
Study Design: Forty subjects (N = 40) at 2 study sites presenting with superficial rhytides and other symptoms of
photoaging or scars received 3 treatments at 4-week intervals using a T-250 lens array. Total fluence ranged from 3.0 to 7.0
J/cm2. Zimmer air cooling was used for all treatments. No topical anesthetic was required.
Results: The most common immediate and expected clinical effects were erythema and edema lasting less than 24 hours,
although 6 patients reported edema lasting for up to 1 week. There were no permanent side effects. In total, 2.7% of treatments
resulted in temporary side effects, the most significant of which was a slight depression on the cheek (n = 1), which
completely resolved within 3.5 months. Other side effects included localized areas of acneiform subcutaneous erythematous
papules (n = 4) and a linear superficial crust (n = 1) with the original tip, all of which resolved within 1 week. One patient
reported small erythematous subcutaneous nodules resolving in 17 days. Tenderness of the neck lasting from 2 weeks (n = 2)
to 3 weeks (n = 1) was also reported.
Results: In all, 92% of the patients completed 3 treatments. Of these, 85% completed the 1-month follow-up. At the
follow-up, 94% of subjects exhibited improvement in one or more categories, 82% exhibited mild to moderate improvement,
and 12% exhibited good improvement. Side effects were minimal and included mild posttreatment erythema and edema
resolving within 24 hours. Pain during treatment was judged minimal to moderate. Postauricular histology showed areas of
thermal injury up to 250 ?m deep and 150 ?m wide.
Conclusions: A 1440-nm beam split by a microlens array is a promising new approach for inducing nonablative
neocollagenesis in the remodeling of scars and rhytids. Histologic evidence confirms the microcolumnar nature of callagen heating using this microarray.