Port wine stain treatment with a dual-wavelength Nd:Yag laser and cryogen spray cooling: A pilot study

2004 ◽  
Vol 34 (2) ◽  
pp. 164-167 ◽  
Author(s):  
Uro? Ah?an ◽  
Peter Zorman ◽  
Dejan Recek ◽  
Simon Ralca ◽  
Boris Majaron
Keyword(s):  
Pilot Study ◽  
Nd:Yag Laser ◽  
Spray Cooling ◽  
Dual Wavelength ◽  
Port Wine Stain ◽  
Port Wine ◽  
Cryogen Spray Cooling

scholarly journals Improvement of port wine stain laser therapy by skin preheating prior to cryogen spray cooling: A numerical simulation

2006 ◽  
Vol 38 (2) ◽  
pp. 155-162 ◽  
Author(s):  
Wangcun Jia ◽  
Guillermo Aguilar ◽  
Wim Verkruysse ◽  
Walfre Franco ◽  
J. Stuart Nelson
Keyword(s):  
Numerical Simulation ◽  
Laser Therapy ◽  
Spray Cooling ◽  
Port Wine Stain ◽  
Port Wine ◽  
Cryogen Spray Cooling

Optimization of Cryogen Spray Cooling for Port Wine Stain Laser Therapy Using Photoacoustic Measurement of Epidermal Melanin

2003 ◽  
Author(s):  
John A. Viator ◽  
Guillermo Aguilar ◽  
Steven L. Jacques ◽  
J. Stuart Nelson
Keyword(s):  
Laser Pulse ◽  
Depth Profile ◽  
Laser Energy ◽  
Spray Cooling ◽  
Skin Lesions ◽  
Propagation Time ◽  
Pulse Parameter ◽  
Port Wine Stain ◽  
Port Wine ◽  
Cryogen Spray Cooling

Treatment of vascular skin lesions, such as port wine stain (PWS) birthmarks, uses laser energy to thermally damage the hypervascular regions in the dermis. Delivery of sufficient laser energy to the dermis can be confounded by the more superficial epidermal melanin layer, a broadband optical absorber. Laser pulses directed at skin lesions may result in excessive heating and scarring of the epidermis, resulting also in limiting the energy available to treat the dermal lesion. Cryogen spray cooling is used to selectively cool the epidermis, allowing the use of higher laser fluences which cause thermal damage in the deeper lesion, while preventing hypertrophic scarring of the epidermis. In order to optimize cryogen cooling and laser pulse parameter for treatment, the depth profile of the epidermal melanin layer and vascular lesion must be known. We use a photoacoustic probe to determine this depth profile. A Q-switched Nd:YAG laser emitting 532 nm light pulses of 4 ns duration is used to excite acoustic waves in epidermal melanin and hemoglobin in the vascular lesions via a miniature probe incorporating a piezoelectric detector. We used acoustic propagation time to determine the spatial relationship of the absorbing structures, thereby giving the necessary means to determine cryogen spurt and laser pulse timing. We present a finite difference thermal model along with data from tissue phantoms showing the effectiveness of the photoacoustic method.

Evaporation Characteristics of a Single Droplet in Laser Treatment of Port Wine Stain in Conjunction with Cryogen Spray Cooling

2008 ◽  
Vol 35 (6) ◽  
pp. 952-956 ◽  
Author(s):  
周致富 Zhou Zhifu ◽  
辛慧 Xin Hui ◽  
陈斌 Chen Bin ◽  
王国祥 Wang Guoxiang
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Port Wine Stain ◽  
Port Wine ◽  
Single Droplet ◽  
Cryogen Spray Cooling
Sign in / Sign up

Export Citation Format

Share Document