By A. J. Augustin (auth.), Stanislao Rizzo MD, Fabio Patelli MD, David R. Chow MD (eds.)
ISBN-10: 3540685863
ISBN-13: 9783540685869
ISBN-10: 3540694617
ISBN-13: 9783540694618
Since the creation of vitrectomy within the Nineteen Seventies, vitreoretinal surgical procedure has swiftly constructed. first and foremost, new instrumentations have been created to facilitate intraocular maneuvers and to regard just about all the vitreoretinal pathologies. excessive velocity vitrectome probs, forceps, scissors, endolaser probes, and new mild resources (xenon/photon mild) let us to accomplish more secure surgeries.
However, within the previous couple of years the method of vitreoretinal surgical procedure has replaced with the creation of small gauge tools and sutureless surgical procedure. at this time there's nonetheless confusion between vitreoretinal surgeons in regards to the use of 25-, 23- or 20-gauge sutureless systems.
Leading surgeons within the box have been recruited to supply their insights into the sutureless recommendations they perform.
Topics handled within the booklet include:
fluidics and technical features of 23- and 25-gauge systems
basic vitrectomy suggestions of 23- and 25-gauge systems
sclerotomy features of the sutureless approach
advantages and drawbacks of the sutureless technique
vitreoretinal pathologies handled with 23- and 25-gauge systems
complications of the sutureless technique
current scientific data
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Additional info for Vitreo-retinal Surgery
Sample text
Incandescent, fluorescent, and high intensity discharge are categories of lamps available in the market, although new semiconductor lighting is making inroads [20]. For ophthalmic applications, high intensity discharge lamps are primarily used. Light source selection depends on efficacy, a figure of merit for the conversion of electrical into optical energy. It is defined as the output lumens per input wattage, and has units of lumens per watt. The higher the efficacy, the less energy the lamp needs to operate.
Consult recent literature articles for more information, and look to upcoming talks and articles to continue to shed light on the mechanics of vitrectomy. The factors and effects discussed above hold when adjusting parameters for a certain cutter design and size. 25-gauge cutters have greater flow losses and lower flow than 20-gauge cutters operating at the same parameters. , 550 mmHg) to overcome these greater flow losses and provide adequate flow. Thus, higher aspiration settings do not necessarily indicate that a 25-gauge cutter has greater traction than a 20-gauge cutter.
A higher NA fiber captures increased light into the fiber. 7. 4 mm. 5mm diameter light pipe would capture more light than the 1-mm diameter light pipe. Therefore, it is important to note the role the NA of the fiber plays, and it is the parameter to look for when investigating optical fibers. The size of the fiber also plays a role in coupling, but a larger diameter fiber with a lower NA has a lower coupling capability than a smaller diameter fiber with a higher NA. 7 System Loss The efficiency of the illumination system, or the output of a light pipe, depends on its coupling efficiency, a measure of the power emitted from the optical source which can be coupled into the fiber.
Vitreo-retinal Surgery by A. J. Augustin (auth.), Stanislao Rizzo MD, Fabio Patelli MD, David R. Chow MD (eds.)
by Mark
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