Vitrectomy using precise fluid movement

With fluidics in modern vitrectomy one of the continuing hot topics in ophthalmology Oertli's focus at this year's ESCRS was its Faros fluidics system which, using the peristaltic principle allows doctors to exercise precision regulation. The compact device allows immediate vacuum build-up, which can be precisely controlled using the system's foot pedal. The pump also enables control of aspiration flow and can control micro-flow rates in the range of 1 mL so that there are no effects as a result of peristaltic rolls. Additionally, the system includes the easyPhaco technology for 2.2 and 1.6 mm micro incision surgery.

Peristaltic pumps work with flow by means of roller systems. Compression of the tubes by the rotating movement 'milks' the liquid column out of the tubing system. While this is happening the flow can be directly controlled. The preset vacuum is achieved as soon as the outflow is occluded, i.e. As a rule, at the tip of the cutter. As soon as occlusion occurs, the vacuum starts building up, the rollers begin to move more slowly and the outflow decreases. How quickly the rollers respond can partly be influenced by how this parameter is present.

Oertli has recently undertaken a great deal of research looking at two pump concepts, flow controlled and vacuum controlled, or peristaltic and venture. Visit www.oertl-instruments.com for more information.