Repetitive progressive axial displacement pattern for phacoemulsifier needle tip
First Claim
1. A method to improve the efficiency of a phacoemulsification system by delivering a burst of ultrasonic power synchronized with a fraction of a low frequency motion waveform at a phacoemulsification needle tip, the method comprising:
- selecting an ultrasonic electro-mechanic actuator to axially oscillate a phacoemulsifier needle at ultrasonic frequency;
selecting a low frequency electro-mechanic actuator to axially oscillate a phacoemulsifier needle at low frequency;
mechanically combining the ultrasonic electro-mechanic actuator and the low frequency electro-mechanic actuator to obtain an axial phacoemulsification needle displacement pattern corresponding to the combined action of both ultrasonic and low frequency electro-mechanic actuators;
selecting a low frequency driver signal waveform to oscillate the low frequency electro-mechanic actuator;
selecting an ultrasonic driver signal waveform to oscillate the ultrasonic electro-mechanic actuator;
detecting a phase and position signal of the low frequency electro-mechanic actuator to synchronize bursts of ultrasonic actuator activity;
in a way that bursts of axial ultrasonic activity of the phacoemulsifier needle are repeatedly produced in synchronization with a fraction of each low frequency electro-mechanic actuator cycle.
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Abstract
A method to improve phacoemulsification efficiency by providing bursts of axial ultrasonic activity in synchronization with a fraction of a lower frequency axial oscillatory activity, the fraction corresponding to the portion of the low frequency signal that displaces toward the lens fragments and distally from the phacoemulsification hand-piece. Ultrasonic bursts synchronized with displacement of the phacoemulsification needle tip toward the lens tissue increases efficiency allowing the reduction of the required ultrasonic power minimizing heat generation and cavitation.
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Citations
1 Claim
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1. A method to improve the efficiency of a phacoemulsification system by delivering a burst of ultrasonic power synchronized with a fraction of a low frequency motion waveform at a phacoemulsification needle tip, the method comprising:
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selecting an ultrasonic electro-mechanic actuator to axially oscillate a phacoemulsifier needle at ultrasonic frequency; selecting a low frequency electro-mechanic actuator to axially oscillate a phacoemulsifier needle at low frequency; mechanically combining the ultrasonic electro-mechanic actuator and the low frequency electro-mechanic actuator to obtain an axial phacoemulsification needle displacement pattern corresponding to the combined action of both ultrasonic and low frequency electro-mechanic actuators; selecting a low frequency driver signal waveform to oscillate the low frequency electro-mechanic actuator; selecting an ultrasonic driver signal waveform to oscillate the ultrasonic electro-mechanic actuator; detecting a phase and position signal of the low frequency electro-mechanic actuator to synchronize bursts of ultrasonic actuator activity; in a way that bursts of axial ultrasonic activity of the phacoemulsifier needle are repeatedly produced in synchronization with a fraction of each low frequency electro-mechanic actuator cycle.
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Specification