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S. Evans, G. Tsai, P. Nguyen; Injection Force of the Visiogen Synchrony Preloaded Injector. Invest. Ophthalmol. Vis. Sci. 2008;49(13):3783.
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To evaluate the Visiogen Synchrony Preloaded Injector and determine the average peak friction force required to deliver this dual optic accommodating IOL.
A calibrated load cell was attached to a Chatillon force tester and set to compression mode. Fifty eight (58) Preloaded Visiogen Synchrony Injectors were placed into a holding fixture designed to stabilize the injectors during insertion and simulate actual use. The fixture was attached to a load cell and the plunger of the Synchrony Injector was advanced at a rate of 6 inch/minute. The peak force of injection was recorded using system software as a function of distance traveled. Five IOL powers (17D (n = 10), 18D (n = 15), 20D (n = 14), 21.5D (n = 5) and 24 D (n = 14)) were evaluated.
The plunger traveled smoothly down the injection barrel and all lenses were delivered without damage. An initial peak force was recorded that represents the force required to overcome static friction and then the force profile decreased to a constant dynamic friction force as the single piece silicone dual optic IOL traveled down the injector nozzle. The mean ± SD peak injection force for all units tested was 0.32 ± 0.17lbs. The mean ± SD peak injection force by diopter group was 0.27 ± 0.14 lbs (17D), 0.27 ± 0.17 lbs (18D), 0.45 ± 0.21 lbs (20D), 0.29 ±0.04 lbs (21.5D) and 0.30 ± 0.11 lbs (24D).Since the number of samples was different between IOL powers, a balanced ANOVA was performed considering five randomly picked samples for each IOL power. There was no significant difference between the forces recorded for the various IOL powers (p = 0.59).
The Preloaded Visiogen Synchrony IOL Inserter successfully delivered fifty eight (58) dual optic lenses. The average peak force recorded is similar to the forces that have been attributed to other injection systems and did not vary with lens diopter power.
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