Torsional Ultrasound Hand Piece That Eliminates Chatter
First Claim
1. An ophthalmic ultrasound surgical instrument, comprising:
- a surgical hand piece suited for phacoemulsification that includes a phacoemulsification needle that is hollow to define an aspiration passage and that distally terminates at a tip with a tip port, the needle being bent or angled;
an infusion sleeve arranged radially outside of the needle so as to define therebetween an irrigation passage to channel irrigation flow, the infusion sleeve defining an irrigation opening arranged for the irrigation flow to exit the irrigation passage;
a horn with a distal section and a resonant section, the distal section being longer than the resonant section, the horn coupled to the needle; and
a driver configured and arranged to impart a twisting, rotative movement to the tip at an elevated resonant frequency sufficient to eliminate chatter otherwise present at lower resonant frequencies.
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Accused Products
Abstract
A torsional ultrasound surgical hand piece lessens or eliminates chatter from lens material by imparting a twisting, rotary motion to a tip of a phacoemulsification needle at a resonant frequency in excess of 32 kHz. The hand piece has a horn that is designed to operate at an elevated frequency while maintaining size constraints for hand-held ophthalmic instruments. Optionally, heat generation is reduced either through the use of a polyimide tubing situated between the needle and the infusion sleeve, through the use of thermal watch to prevent overheating at the incision, and/or through the use of a bypass hole in the needle that diverts flow under suction into the needle via the bypass hole instead of exiting through an irrigation opening in the infusion sleeve when a tip port is occluded by lens material.
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Citations
14 Claims
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1. An ophthalmic ultrasound surgical instrument, comprising:
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a surgical hand piece suited for phacoemulsification that includes a phacoemulsification needle that is hollow to define an aspiration passage and that distally terminates at a tip with a tip port, the needle being bent or angled; an infusion sleeve arranged radially outside of the needle so as to define therebetween an irrigation passage to channel irrigation flow, the infusion sleeve defining an irrigation opening arranged for the irrigation flow to exit the irrigation passage; a horn with a distal section and a resonant section, the distal section being longer than the resonant section, the horn coupled to the needle; and a driver configured and arranged to impart a twisting, rotative movement to the tip at an elevated resonant frequency sufficient to eliminate chatter otherwise present at lower resonant frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An ophthalmic ultrasound surgical hand piece, comprising:
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a horn with a distal section and a resonant section, the distal section being longer than the resonant section; a phacoemulsification needle coupled to the distal end horn; a transducer coupled to the proximal end of the horn, the transducer imparting vibration at a frequency to the horn; and a hand piece shell that at least partially encloses the transducer and the horn. - View Dependent Claims (11, 12, 13, 14)
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Specification