A new 25-gauge instrument system for transconjunctival sutureless vitrectomy surgery1
Section snippets
Materials and methods
The TSV consists of a 25-gauge microcannula system and a wide array of vitreoretinal instruments specifically designed for this operating system. Integral to this vitrectomy instrument system is the 25-gauge microcannula system, which includes a microcannula, an insertion trocar, an infusion cannula, a plug forceps, and a cannula plug.
The microcannula consists of a thin-walled polyamide tube 3.6 mm in length with an inner/outer diameter of 0.57/0.62 mm. A collar is present at the extraocular
Results
Infusion and aspiration rates of BSS for both the 20-gauge and 25-gauge infusion cannulas are in Figure 3, Figure 4. In general, the average infusion and aspiration rates of the TSV at various settings are reduced by 6.9 and 6.6 times, respectively, compared with the 20-gauge system. For both cannula sizes and vitrectors, infusion and aspiration rates decreased proportionally with decreasing bottle height and aspiration power.
During this study, procedures were performed on 20 consecutive
Discussion
Since the introduction of pars plana vitrectomy in the early 1970s by Machemer et al,1 advances in the field of vitreoretinal surgery have been dramatic. Machemer initially performed pars plana vitrectomy with the use of a 17-gauge (1.5-mm diameter) multifunctional instrument capable of cutting and aspirating the vitreous.9 This instrument used a fiberoptic sleeve and required a 2.3-mm scleral incision. In 1974, O’Malley and Heintz10 designed a smaller vitreous cutter with a diameter of 0.9 mm
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The new Transconjunctival Sutureless Vitrectomy System is disclosed to Bausch and Lomb Surgical, St. Louis, MO. The Microsurgery Advanced Design Laboratory (MADLAB) may receive royalties related to the sale of this and other instruments mentioned in the article.