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Thread: Phacodynamics:pedal positions, flow rate and vacuum Video

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    Default Phacodynamics:pedal positions, flow rate and vacuum Video


    is the study of the fundamental principles of inflow rates, outflow rates, vacuum, phaco power modulation along with microsurgical maneuvers with different types and grade of cataract.
    Phacodynamics:pedal positions, flow rate vacuum attachment.php?attachmentid=208&stc=1&d=1434523642
    Foot Pedal
    The foot pedal can be used to controls of the speed of the pump and or the ultrasound

    Position 1 irrigation (no aspiration no ultra sound)
    Position 2 irrigation on, aspiration on, (no ultrasound)
    Position 3 irrigation on, aspirtation on, ultrasound on

    The inflow fluid originates in the irrigation bottle and is a balanced salt solution. The fluid travels from the irrigation bottle through plastic tubing, into the phaco needle and finally into the anterior chamber of the eye. To create a pressure gradient the bottle is placed at a height above the patient. When the pinch valve is open the fluid in the bottle and tubing creates pressure in the anterior chamber. Approximately 11 mm Hg pressure (above ambient atmospheric pressure) is produced intraocular for every 15 cm (6 inches) bottle height above the patient’s eye.

    The fluid that leaves the anterior chamber. Fluid leaves through the phaco needle into the tubing and into the anterior chamber of the eye . This can be increased by increasing the aspiration flow rate. Another source of fluid loss is through wound leakage.

    Aspiration Flow Rate
    The amount of fluid flowing through the tubing. This is reported in cubic centimeters per minute (cc/min). With a peristaltic pump, flow is determined by the speed of the pump. As flow increases the current in the anterior chamber increases how well particulate matter is attracted to the phaco tip.

    The difference in fluid pressure among two points. Negative pressure measured in millimeters of Mercury (mm Hg). Vacuum determines how well, once occluded on the phaco tip, nuclear material will be held to the tip.(holding power)

    This part of presentation covers pedal positions - flow rate, aspiration and vacuum

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