To the Editor.
—Fluid-air exchange is an important technique in the repair of complicated retinal detachments. Gross and associates1 described a simple, inexpensive, and pressure-regulated air pump for fluid-air exchange during pars plana vitrectomy. Landers and associates2 designed a similar air pump and found it comparable with the Grieshaber Air System (Grieshaber, Langhorn, Pa) in different laboratory and operating room situations. Unfortunately, with a similar air pump we encountered an unexpected problem that should be taken into consideration by vitreous surgeons, especially those in developing countries.We used an inexpensive fish-tank air pump (Has Research Inc, Izmir, Turkey). The air pump consisted of a transformer for alternating current, a metal rod that was connected to a rare earth magnet, and a diaphragm (Fig 1). The rare earth magnet vibrated the metal rod back and forth (approximately 50 times per second) as alternating current changed its direction. Thus, movements
Özler SA, Algan O, Haznedaroğlu G. An Unexpected Problem With an Inexpensive Air Pump for Vitreous Surgery. Arch Ophthalmol. 1993;111(5):583–584. doi:10.1001/archopht.1993.01090050017011
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