Phacoemulsification needle

摘要

A phacoemulsification needle having a central, hollow passageway terminates in a straight, enlarged needle tip formed off-axis from the passageway, allowing the needle tip to move eccentrically when the needle is subjected to torsional vibratory motion.

主权项

1. A phacoemulsification needle for use with a phacoemulsification handpiece capable of imparting a torsional, ultrasonic vibratory motion to said needle, said needle comprising:
a hollow, elongate needle body having a proximal end, a distal end, and a central longitudinal axis extending between the proximal and distal ends; a mount at the proximal end configured to attach said needle body to a handpiece capable of imparting a torsional ultrasonic vibratory motion to said needle body,
said needle body having a wall with an outer surface and an inner surface,said needle body inner surface defining a central passageway extending through said needle body from said proximal end to said distal end; and a needle tip at said distal end flaring radially outwardly from the outer surface of the needle body wall away from the central longitudinal axis at the distal end,
said tip having an exterior surface and an interior surface, defining therebetween a tip wall comprising a first axially extending length,said tip wall terminating in a lip,said tip having a mouth defined by said lip, at least one portion of said tip having a cross-sectional shape normal to said central longitudinal axis of the needle body that is larger than a cross-sectional shape of at least a portion of the needle body normal to said central longitudinal axis of the needle body, said first axially extending tip wall length having a tip central longitudinal axis substantially parallel to said central longitudinal axis of the needle body, said central longitudinal axis of the needle body and said tip central longitudinal axis being radially offset one from the other, whereby an eccentric motion is imparted to said tip when a torsional, ultrasonic motion is imparted to said needle body through the handpiece attached at the proximal end of the needle body.