Fig 1.
(A) 23-gauge HV needle (center) compared with 25-gauge (right) and 23-gauge (left) of guillotine needle. (B) High-magnification image of the tip and port of the HV.
Table 1.
Multiple regression models using mixed repeated measures models: Predicting guillotine vitrector water and vitreous flow rates for increasing aspiration levels and cut rate.
Table 2.
Multiple linear regression models using mixed repeated measures models: Predicting hypersonic vitrector water flow rates for increasing aspiration and % US power.
Fig 2.
(A) Predicted and actual water flow through HV cutter for Vacuum * port area cross term. (B) Predicted and actual water flow through HV device for √Vacuum * port area cross term.
Table 3.
HV water flow (ml/min) as a function of port diameter and vacuum.
Table 4.
Multiple regression models using mixed repeated measures models, predicting vitreous flow rates for increasing aspiration and % US power.
Fig 3.
Predicted and actual vitreous flow through HV cutter for vacuum* port area cross term.
Table 5.
Increase in vitreous flow rate by increments of power or vacuum.
Table 6.
Typical vitreous flow (ml/min) through 0.007 in diameter port at various vacuums and powers.
Fig 4.
Average vitreous flow rate by cutting power for 23-gauge GV and 23-gauge HV cutters.