Control of pulse duty cycle based upon footswitch displacement
AssigneeAbbott Medical Optics Inc.
InventorsKenneth E. Kadziauskas, Paul Rockley
Life of this patent
Estimating the term…
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.
Claims15
A phacoemulsification apparatus comprising:
- a phacoemulsification handpiece having a needle, the needle configured to be ultrasonically vibrated;
- a power source configured to provide pulsed electrical power to the handpiece;
- an irrigation source configured to provide irrigation fluid to the eye;
- an aspiration source configured to provide aspiration of fluid from the eye;
- a power level controller;
- and
- a footswitch configured to enable a surgeon to select a first mode comprising a variable amplitude of the electrical pulses or a variable duty cycle of the electrical pulses;
- wherein the power level controller is configured to vary the amplitude or duty cycle when the footswitch operates within a first zone of a plurality of defined zones according to a nonlinear profile provided within the first zone within an available directional travel range of the footswitch, the footswitch also configured to select a second mode comprising at least one of an irrigation flow and an aspiration flow, the second mode varying by operating the footswitch within a second zone of the plurality of defined zones within the available directional travel range of the footswitch.
A method for operating a phacoemulsification system, the system including a phacoemulsification handpiece having a needle, an irrigation source, an aspiration source, a power source configured to provide pulsed electrical power to the handpiece, and a footswitch, said method comprising:
- applying pulsed electrical power from the power source to the handpiece;
- receiving input from a user via the footswitch;
- selecting a first mode comprising a variable amplitude of the electrical pulses or a variable duty cycle of the electrical pulses varying by operating the footswitch within a first zone of a plurality of defined zones according to a nonlinear profile provided within the first zone within an available directional travel range of the footswitch;
- and
- selecting a second mode comprising at least one of an irrigation flow and an aspiration flow, the second mode varying by operating the footswitch within a second zone of the plurality of defined zones within the available directional travel range of the footswitch.
Dependencies are inferred from the claim text.