US 2021/0196515 A1 · PHACOEMULSIFICATION CIRCUIT

Abstract

Disclosed is a surgical instrument directed to phacoemulsification for cataract eye surgery. The instrument generally includes a dual frequency voltage producing circuit comprising a low-frequency voltage pathway with a low-frequency LC Network and a high-frequency voltage pathway with a high-frequency LC network. A phacoemulsification needle extends from a handpiece able to be driven by a piezoelectric transducer. The piezoelectric transducer is electrically connected to the dual frequency voltage producing circuit. The high-frequency voltage pathway is electrically tuned with the physical high natural frequency of the handpiece and the low-frequency voltage pathway is electrically tuned with the physical low natural frequency of the handpiece for efficient transfer of energy.

Claims20

Dependent claims

A phacoemulsification arrangement for a phacoemulsification procedure, comprising:

a needle extending from a handpiece that includes a piezoelectric transducer;
and
a dual frequency producing circuit comprising a low-frequency oscillator and a high-frequency oscillator,
the dual frequency producing circuit is electrically connected to the piezoelectric transducer,
the low-frequency oscillator is configured to drive the piezoelectric transducer that periodically vibrates the needle at a low frequency of less than 60 kHz, and
the high-frequency oscillator is configured to drive the piezoelectric transducer that periodically vibrates the needle at a high frequency of greater than or equal to 60 kHz while producing a single node of minimum amplitude along the needle.

3 more elements

A phacoemulsification configuration, comprising:

a dual frequency voltage producing circuit comprising a low-frequency voltage pathway that includes a low-frequency oscillator and a low-frequency LC network and a high-frequency voltage pathway that includes a high-frequency oscillator and a high-frequency LC network;
a needle extending from a handpiece, the handpiece including a piezoelectric transducer, the piezoelectric transducer electrically connected to the dual frequency voltage producing circuit;
when the high-frequency oscillator is in a high-frequency on state and the low-frequency oscillator is in a low-frequency off state, the needle comprises a single non-displacement region that has essentially no vibration displacement, and when the low-frequency oscillator is in a low-frequency on state and the high-frequency oscillator is in an off state, the needle does not comprise a single non-displacement region.

A method for driving a phacoemulsification assembly, comprising:

providing a dual frequency producing circuit electrically connected to a phacoemulsification assembly comprising a needle extending from a handpiece, the handpiece comprising a piezoelectric transducer;
generating one of an independent high-frequency ringing in the needle, an independent low-frequency ringing in the needle or a combination high-low frequency ringing in the needle;
producing the high-frequency ringing by energizing the piezoelectric transducer with a high-frequency voltage from the dual frequency producing circuit, the high-frequency ringing causing a single node of minimum amplitude along the needle;
producing the low-frequency ringing by energizing the piezoelectric transducer with a low-frequency voltage from the dual frequency producing circuit, the low-frequency ringing causing no node of minimum amplitude along the needle.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/203,637Filed 16 Mar 2021

Priority

26 Mar 2012

Published

1 Jul 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

A61F 9/00745
Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments: using mechanical vibrations, e.g. ultrasonic
A61M 1/774
Suction-irrigation systems: handpieces specially adapted for providing suction as well as irrigation, either simultaneously or independently
A61M 1/84
Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems:…
A61M 1/85
Drainage tubes; Aspiration tips: with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants

Family

Application13/430,633Continuation in part · filed 26 Mar 2012

Application14/517,798Continuation in part · filed 17 Oct 2014

Application16/821,051Continuation · filed 17 Mar 2020

Application62/991,434Us provisional application · filed 18 Mar 2020

Application17/094,426Continuation in part · filed 10 Nov 2020

Application17/203,637Continuation in part

Application17/094,426Continuation

Application16/821,051Continuation in part

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