CONTROL OF PULSE DUTY CYCLE BASED UPON FOOTSWITCH DISPLACEMENT
First Claim
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1. A phacoemulsification 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 having a frequency that causes the needle to be driven along its longitudinal axis;
an input enabling a surgeon to select an ultrasonic pulse amplitude and a pulse duty cycle supplied to the handpiece; and
a computer programmed to respond to the selected pulse amplitude and the selected pulse duty cycle, wherein said computer controls the power source to provide the pulse of electrical power at a rate of between about 25 and about 2000 pulses per second.
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Abstract
Phacoemulsification apparatus includes a phacoemulsification handpiece having a needle and an electrical circuitry for ultrasonic vibrating the needle. A power source provides pulsed electrical power to the handpiece electrical circuitry and an input is provided for enabling a surgeon to select an amplitude of dislighted pulses and a pulse width. A control system and pulse duty cycle is provided for controlling the off duty cycle to insure heat dissipation before a subsequent pulse is activated, including a foot pedal switch.
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Citations
22 Claims
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1. A phacoemulsification 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 having a frequency that causes the needle to be driven along its longitudinal axis;
an input enabling a surgeon to select an ultrasonic pulse amplitude and a pulse duty cycle supplied to the handpiece; and
a computer programmed to respond to the selected pulse amplitude and the selected pulse duty cycle, wherein said computer controls the power source to provide the pulse of electrical power at a rate of between about 25 and about 2000 pulses per second. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a phacoemulsification handpiece having
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8. A phacoemulsification apparatus comprising:
- a phacoemulsification handpiece having
a needle, the needle configured to be ultrasonically vibrated;
a power source configured to apply a period of electrical power to the handpiece, wherein the power within the period is applied at a frequency that causes the needle to be driven generally along its longitudinal axis;
an input enabling a surgeon to select a power amplitude and a duty cycle; and
a computer programmed to respond to the selected power amplitude and the selected duty cycle in defining the power amplitude and duration of the period of electrical power, wherein the duration of the period is less than twenty (20) millseconds. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
- a phacoemulsification handpiece having
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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:
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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 each of the one or more cycles of electrical power has a period of less than twenty (20) milliseconds;
receiving input from a user defining a power amplitude and a duty cycle; and
controlling the amplitude and duration of each of the one or more electrical cycles in response to the input from the user. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification