This activity is supported by an educational grant from Abbott Medical Optics, Inc.
A peristaltic pump’s primary function is to set a constant flow rate and maintain that flow rate until it reaches a preset vacuum limit. As it pumps fluid (usually with rollers), a peristaltic pump builds up vacuum only when the phaco tip becomes occluded. When the vacuum limit is reached, the rollers slow and the vacuum is maintained until emulsification, and then the process of occlusion and vacuum rise repeats. The peristaltic pump provides for good holdability and is advantageous for the chopping portion of the procedure.
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