Bøger af Franco Canestri

The involvement of lasers in the treatment of biomedical tissue has been investigated by both industry and clinical research laboratories for more than 70 years. Two major families of medical lasers differ themselves as follows: the beams showing "absorption" modalities by the tissue (CO2 lasers-like) in the region of 10 micron wavelength and the other ones showing "scattering" characteristics into the tissue (YAG lasers-like) in the region of 1 micron. The first one shows strong haemostatic properties in low-water content tissue, while the second one shows strong concentration ("pile-up") of energy below the surface with consequent heating, cutting and haemostasis of the irradiated volume in the depth of the same. One key aspect always to be considered is the combination of liquid content of the irradiated tissue, the anatomical structure of the tissue, the beam wavelength and the emitted energy on the spot (power density). The current main open questions and challenges related to the clinical usage of modern medical lasers are here presented and constructively discussed.

The CO¿ laser is one of the highest-powered and most efficient operating tool used in a wide variety of medical and surgical applications. This book presents new concepts about both mechanical and thermodynamic measurements along with models for laser beam spreading in biological tissues and also in media which simulate the characteristics of a given biological substance exposed to laser radiations. The poly(methyl methacrylate) is one of these solid chemical compounds which have several applications in medicine and biology. This makes it ideal tool for both direct clinical utilization and research activities. The goal of this book is to isolate a unified theory, which correlates all the thermodynamic interrelated phenomena taking place during the production of laser beam craters in low-water-content tissues, and present a solution for the geometry of the stable limiting crater. This book presents new evidence about the existence of the acceleration followed by a constant speed in the development of the crater¿s horizon. A fundamental link between this speed and the equation regulating the growth of the crater¿s volume as function of the exposure time is discussed as well.