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When one has observed the splendid results which are obtained in the treatment of separated retina by catholysis (Vogt), one naturally begins to search for the finest and sharpest possible needle for use in such treatment, for it is conceivable that a needle sufficiently fine and sharp could repeatedly penetrate the sclera and the vessels of the choroid and retina while carrying a negative galvanic current of 1 milliampere without producing enough leakage of the subretinal fluid or blood to give a handicap or detriment of any sort during a two hour operative period.
The bending and breaking characteristics and the penetrating length of a needle of this kind must be fully controlled to make it satisfactory for the separated retina operation, and one should be able to perform from 125 to 175 scleral punctures before it becomes dull.
CONSTRUCTION OF THE INSTRUMENT
The instrument pictured and described in this
Walker CB. SPECIAL DEVICE FOR LOCALIZATION AND TREATMENT OF RETINAL TEAR WITH GALVANIC CURRENT. Arch Ophthalmol. 1936;15(6):1094–1097. doi:10.1001/archopht.1936.00840180138012