A PREVIOUS experimental study in the rabbit indicated that scissors were superior to knives in cutting vitreous membranes (see page 677 of this issue). This report describes a technique and an instrument designed for cutting vitreous membranes in humans.
The new instrument is composed of miniature blades attached to a handle (Fig 1 and 2). It weighs 21 gm and is constructed of stainless steel. The handle is round, 9.5 cm in length, 0.7 cm in diameter, and tapered at both ends. The scissors' blades are 5 mm in length and are located at the end of a rod (Fig 2, 1) which is inserted in the handle. The blades are attached to the rod in such a way that spring tension holds them in the open position with their tips 1.5 mm apart (Fig 1, 1). The thumb plate (Fig 1, 4), mounted on the handle, activates
Freeman HM, Schepens CL, Anastopoulou A. Vitreous SurgeryII. Instrumentation and Technique. Arch Ophthalmol. 1967;77(5):681-682. doi:10.1001/archopht.1967.00980020683024