title: Feasibility of ultrasound cataract surgery with a 1.4 mm incision.
abstract: OBJECTIVE
  To study the feasibility of performing ultrasound (US) phacoemulsification cataract surgery through a 1.4 mm incision using conventional phacoemulsification equipment but removing the infusion sleeve from the US tip.
  
  
  METHODS
  Department of Ophthalmology, Jikei University, Tokyo, Japan.
  
  
  METHODS
  The infusion sleeve was removed from a 20 gauge US tip, and the sleeveless tip was inserted in a 1.4 mm incision in a postmortem porcine eye, providing infusion through a side port; phacoemulsification was performed with the US tip occluded. Temperature at the incision site was measured with a thermometer to determine whether a thermal burn occurred during the process. A hooked infusion cannula with a widened inner channel and 3 apertures was used to stabilize the anterior chamber depth.
  
  
  RESULTS
  Ultrasound phacoemulsification produced almost no temperature elevation at the incision site as long as the infusion liquid was adequately circulated around the US tip. With the 20 gauge US tip, an adequate volume of leakage was maintained through the 1.4 mm incision; no thermal burns developed at the incision site. The use of a hooked infusion cannula made it possible to stabilize the anterior chamber and to apply the bimanual nucleofractis technique to emulsify and aspirate the lens nucleus.
  
  
  CONCLUSIONS
  Using a sleeveless 20 gauge US tip, US cataract surgery was safely performed through a 1.4 mm incision without producing thermal burns at the incision site.
authors.affiliation: Department of Ophthalmology, Jikei University School of Medicine, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tsuneoka
authors.forename: T
authors.initials: T
authors.lastname: Shiba
authors.forename: Y
authors.initials: Y
authors.lastname: Takahashi
mesh_terms: D000818:Animals; D001831:Body Temperature; D002386:Cataract / Q000628:therapy*; D002404:Catheterization / Q000295:instrumentation; D005240:Feasibility Studies; D006358:Hot Temperature; D019060:Minimally Invasive Surgical Procedures; D018918:Phacoemulsification / Q000295:instrumentation / Q000379:methods*; D013552:Swine; D014464:Ultrasonic Therapy / Q000295:instrumentation*