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Facial Hypertrophic Port-Wine Stain Treatment Combining Large Spot 532 nm Laser, High-Intensity Focused Ultrasound and Traction Threads
摘要： Vascular lasers are the gold standard treatment for treating facial capillary malformations commonly known as port-wine stains (PWSs). However, up to 65% of them are associated with significant soft tissue hypertrophy that cannot be satisfactorily addressed using vascular lasers. The authors report a 40-year-old Caucasian woman with a large PWS of the mid and lower face and neck. It was unilateral and associated with significant hypertrophy of the affected face that resulted in significant asymmetry. Both face and neck had been previously treated with several sessions of different vascular lasers: 'small spot' potassium titanyl phosphate (532 nm) laser, intense pulsed light devices, and pulsed-dye laser (PDL). Pulsed-dye laser produced partial improvement of lesional color and was associated with minor scarring on her neck. Every previous treatment was stopped after several sessions when no further improvement was achievable. The authors initiated treatment with large spot, short pulse 532 nm laser with contact cooling (ExcelV; Cutera, Inc., Brisabane, CA; fluence 9–10 J/cm2, pulse duration 6 milliseconds, 8-mm spot on the cheek and 7–9 J/cm2, 6–7 milliseconds, 9-mm spot on the neck) every 4 weeks for the vascular component of her PWS. After 6 sessions, the authors obtained 34.61% improvement in lesional color and area, measured with objective 3-dimensional digital photography as described previously. To improve soft tissue hypertrophy and facial asymmetry, high-intensity focused ultrasound (HIFU) treatment was introduced (Ultraformer III; Classys, Inc., Seoul, Republic of Korea). The authors used 3 transducers working at the depths of 4.5, 3.0, and 1.5 mm, with energies 0.7, 0.6, and 0.4 J, respectively. A total of 600 lines were utilized in 2 sessions of 300 each with 2-week intervals. After 6 months, repositioning of hypertrophic cheek skin was performed with poly-L-lactic acid traction threads (Silhuette-Soft; Sinclair Pharma Ltd., Chester, United Kingdom). The authors used 2 threads with 12 cones (6 on each side) in 'V' shape fashion from 2 entry points in preauricular area and achieved immediate (data not shown) and delayed satisfactory results (Figure 1). The patient reported greater satisfaction from improved facial asymmetry than from color modification.
关键词： Traction Threads,High-Intensity Focused Ultrasound,Facial Hypertrophic Port-Wine Stain,532 nm Laser
更新于2025-09-16 10:30:52
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Tailoring Physical Properties of Carbon Nanotube Threads During Assembly
摘要： Spinnable carbon nanotubes (CNTs) are useful formats for studying physical properties of CNT fiber assemblies in their pristine states. They are free of catalyst, uniform in length, with a comparatively narrow diameter distribution, and their assembly into thread does not require additional chemicals or solvents. Good quality drawable CNT arrays can be readily assembled into uniform diameter threads with great control over the number of CNTs incorporated into the thread assembly. This uniformity allows study the physical properties that result from changes that occur during thread formation. Here, we report trends of electrical resistivity and mechanical strength that resulted from alterations in their manufacturing parameters, allowing to change intrinsic physical properties of a material such as electrical resistivity. We correlate the electrical resistivity and mechanical strength as a function of diameter, density, and turns/meter. Understanding the effects of dry-spinning parameters will allow a better design of the physical properties of CNT threads for specific applications, such as strain or electrochemical sensors.
关键词： resistivity,threads,and twist angle.,fibers,yarns,Carbon nanotubes,diameter control
更新于2025-09-10 09:29:36