Read e-book online Lasers in Cardiovascular Medicine and Surgery: Fundamentals PDF

By Leon Goldman (auth.), George S. Abela M.D. (eds.)

ISBN-10: 1461288010

ISBN-13: 9781461288015

ISBN-10: 1461314895

ISBN-13: 9781461314899

Following the appearance of percutaneous balloon vel oped and come for scientific use, to boot angioplasty, interventional cardiovascular professional­ as those who are nonetheless in investigational stages. cedures became of serious curiosity to the medical case stories are provided through professional in­ heart specialist, radiologist, and cardiovascular vestigators at the use of assorted catheter structures health care professional. the most generally explored within the coronary and peripheral flow. possible choices to circumvent surgical procedure is laser-mediated half V (Chapters 17-23) is the main up-to­ angioplasty. The fascination with laser radia­ date evaluation of the scientific event with vari­ tion has significantly contributed to its attractiveness, ous laser supply platforms. there's an emphasis yet has additionally stressed it with unrealistic ex­ on sufferer choice, standards for lesion selection, pectations. Many advertisement laser platforms are and follow-up info. an in depth description of accessible to the clinician and the researcher, laser recanalization options is gifted for which frequently makes the alternative of a laser procedure some of the platforms within the scientific setting.

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Leon Goldman (auth.), George S. Abela M.D. (eds.)'s Lasers in Cardiovascular Medicine and Surgery: Fundamentals PDF

Following the arrival of percutaneous balloon vel oped and come for scientific use, besides angioplasty, interventional cardiovascular professional­ as those who are nonetheless in investigational levels. cedures became of serious curiosity to the scientific case studies are awarded via specialist in­ heart specialist, radiologist, and cardiovascular vestigators at the use of assorted catheter structures health professional.

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Additional resources for Lasers in Cardiovascular Medicine and Surgery: Fundamentals and Techniques

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Summary ................................................................. Suggested Reading .......................................................... The first functioning laser was built in 1960. It was called "a solution looking for a problem" because many applications were proposed but few of them were economically justifiable. Research began almost immediately to find medical applications for this intense light source. Now, more than a quarter of a century later, the laser has become commonplace in clinics, operating rooms, and doctors' offices.

If convective losses are negligible and vaporization of a surface layer can occur almost instantaneously after the heat of vaporization is deposited in this surface layer, we can predict laser pulse parameters for efficient ablation: 1) pulse duration Ll T(sec) ~ 900la'2 and 2) pulse Buence of ~ 6000la' J/cm 2 (roughly 2000 ]1 cm', at a depth of x > 1/a'). Under these conditions, the laser pulse can be expected to vaporize a soft tissue layer of a depth of ~x with a transient temperature rise of ~60°C above ambient lasting -LlT sec at a distance of -21a' into the wall of the crater.

U II: III o ..... lHGTH ~I FIGURE 3-13. Comparison of wavelength-dependent absorption curves for water, melanin, and hemoglobin. Wavelengths in the visible spectral range produce heat in the tissue absorbing the light. The concentration or power density of the absorbed light is very closely related to the temperature increase at the absorbing site. When body tissue is raised about 7°C above normal, the protein begins co denature, which results in necrosis. As the temperature increases further, coagulation occurs and, at approximately lOO°C, cellular water begins to boil and vaporize, which causes the cell wall CO explode.

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Lasers in Cardiovascular Medicine and Surgery: Fundamentals and Techniques by Leon Goldman (auth.), George S. Abela M.D. (eds.)


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