Micro-burst ultrasonic power delivery
First Claim
1. An ophthalmic lens extraction apparatus comprising:
- a phacoemulsification handpiece having a needle, the needle configured to be ultrasonically vibrated;
a power source configured to provide a pulse of electrical power to the handpiece that causes the needle to oscillate generally along its longitudinal axis; and
a computer programmed to control the power source based at least in part on a phase signal representing a comparison of voltages representing rise times of a current signal and a voltage signal associated with the handpiece.
6 Assignments
0 Petitions
Accused Products
Abstract
Phacoemulsification apparatus includes a phacoemulsification handpiece having a needle and an electrical system for ultrasonically vibrating said needle along with a power source for providing pulsed electrical power to the handpiece electrical system. Irrigation fluid is provided to the handpiece needle and aspirating fluid is removed from the handpiece needle. A determination of a voltage current phase relationship of the provided electrical power is made and in response thereto a control system varies a power level duty cycle provided to the handpiece electrical system from the power source and/or modify the aspiration flow rate. In addition, a separate input enables manual control of pulse amplitude. The control system provides a pulsed electrical power of less than 20 millisecond pulse duration.
113 Citations
20 Claims
-
1. An ophthalmic lens extraction apparatus comprising:
-
a phacoemulsification handpiece having a needle, the needle configured to be ultrasonically vibrated; a power source configured to provide a pulse of electrical power to the handpiece that causes the needle to oscillate generally along its longitudinal axis; and a computer programmed to control the power source based at least in part on a phase signal representing a comparison of voltages representing rise times of a current signal and a voltage signal associated with the handpiece. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An ophthalmic lens extraction apparatus comprising:
-
a phacoemulsification handpiece having a needle, the needle configured to be ultrasonically vibrated; a power source configured to apply a cycle of electrical power to the handpiece, wherein the power within the cycle is applied at a frequency that causes the needle to be driven generally along its longitudinal axis; and a computer programmed to control the power source based at least in part on a signal derived from times needed for a voltage and a current associated with the phacoemulsification handpiece to reach maximum values. - View Dependent Claims (9, 10, 11)
-
-
12. A method for operating a phacoemulsification system, the system including a phacoemulsification handpiece having a needle having a longitudinal axis and a power source configured to provide electrical power to the handpiece, said method comprising:
applying one or more cycles of electrical power from the power source to the handpiece, wherein the electrical power within the one or more cycles is applied at a frequency that causes the needle of the handpiece to oscillate generally along its longitudinal axis, wherein oscillation of the needle is based at least in part on a comparison of voltages based on rise times of a current signal and a voltage signal associated with the handpiece. - View Dependent Claims (13, 14, 15, 16)
-
17. A method for operating a phacoemulsification system, the system including a phacoemulsification handpiece having a needle having a longitudinal axis and a power source configured to provide electrical power to the handpiece, said method comprising:
-
applying a pulse of electrical power from the power source to the handpiece, wherein the electrical power within the pulse is applied at a frequency that causes the needle of the handpiece to be driven generally along its longitudinal axis based at least in part on a comparison of voltages derived from current and voltage rise times for signals associated with the handpiece; repetitively applying the pulse of electrical power at a rate greater than 25 pulses per second. - View Dependent Claims (18, 19, 20)
-
Specification