title: Combined occlusion-triggered longitudinal and torsional phacoemulsification during coaxial microincision cataract surgery: effect on 30-degree mini-flared tip behavior.
abstract: OBJECTIVE
  To study the impact of a new power-delivery option using occlusion-triggered bursts of longitudinal phaco energy in addition to torsional tip movement in the performance of the 30-degree mini-flared tip to minimize tip clogging with dense nuclei.
  
  
  METHODS
  Prince Charles Eye Unit, King Edward VII Hospital, Windsor, United Kingdom.
  
  
  METHODS
  Comparative case series.
  
  
  METHODS
  The cumulative dissipated energy (CDE) and time in foot pedal position 3 (FP3) to phacoemulsify each half of the nucleus with and without use of the new power-delivery option (Intelligent Phaco) were compared.
  
  
  RESULTS
  Fifty consecutive cataract operations were reviewed. The mean CDE was 1.79 with the new power-delivery option and 2.03 without the option (P=.08). For grades I, II, III, and IV nuclei, the corresponding values were 0.41 and 0.51 (P=.16), 1.43 and 1.23 (P=.31), 2.32 and 2.92 (P=.12), 3.82 and 5.03 (P=.005). The mean FP 3 time was 5.40 seconds with the new power-delivery option and 6.35 seconds without it (P=.03). For grades I, II, III, and IV nuclei, the corresponding values were 1.53 seconds and 1.98 seconds (P=.13), 4.47 seconds and 4.26 seconds (P=.69), 6.51 seconds and 8.77 seconds (P=.05), 11.81 seconds and 16.49 seconds (P=.008).
  
  
  CONCLUSIONS
  The new power-delivery option appeared to reduce the CDE and FP 3 time when a 30-degree mini-flared tip was used. The benefit accrued by preventing clogging of the needle was significant only in cases with a denser nucleus.
authors: Prince Charles Eye Unit, King Edward VII Hospital, Windsor, United Kingdom. g.ratnarajan@gmail.com
authors: Gokulan
authors: G
authors: Ratnarajan
authors: Richard
authors: R
authors: Packard
authors: Mina
authors: M
authors: Ward
mesh_terms: D002386:Cataract / Q000145:classification; D006801:Humans; D008866:Microsurgery / Q000379:methods*; D018918:Phacoemulsification / Q000295:instrumentation* / Q000379:methods*