Systems and methods for controlling vacuum within phacoemulsification systems
The invention relates to systems and methods for controlling vacuum within phacoemulsification systems. The phacoemulsification system may include a handpiece having a needle coupled to a power Source configured to cause the needle to be ultrasonically vibrated during operation, and an aspiration Source. The system includes a footpedal that defines a first position and a second position, and also includes a computer program product operatively coupled to the handpiece and the foot pedal, having a computer usable medium with a sequence of instructions which causes the processor to control power from the power source and vacuum from the aspiration source applied to the handpiece. The process provides a vacuum at a first level to the handpiece when the footpedal is at the first position; provides power to the handpiece when the footpedal is at the second position; and reduces the vacuum to a second level when the footpedal position transitions.
1. A method of controlling power from a power source and a vacuum from an aspiration source applied to a phacoemulsification handpiece, the handpiece having a needle coupled to the power source configured to cause the needle to be ultrasonically vibrated during operation, the needle further defining an aspiration port that is coupled to the aspiration source, a footpedal defining a first position and a second position, the method comprising:
providing the vacuum at a first vacuum level to the handpiece up to a first maximum vacuum level when the footpedal is at the first position;
providing power to the handpiece when the footpedal is at the second position;
determining when the footpedal remains at the second position for a programmable period of time; and
reducing the vacuum to a second vacuum level up to a new maximum vacuum level when the footpedal remains at the second position for the programmable period of time, the new maximum vacuum level is less than the first maximum vacuum level.
2. The method of claim 1 , wherein the new maximum vacuum level is based on a predetermined setting that includes the transition of the footpedal from the first position to the second position displacing the footpedal at the second position for a programmable period of time.
3. The method of claim 1 , further comprising modulating the vacuum between the second vacuum level and a third vacuum level, the third vacuum level is less than the new maximum vacuum level.
4. The method of claim 1 , wherein the footpedal further defines a third position, and further comprising reducing the vacuum level to a third vacuum level when the footpedal transitions to said third position.
5. The method of claim 1 , wherein the footpedal further defines a third position, and further comprising raising the new maximum vacuum level to an adjusted maximum vacuum level and raising the vacuum level up to the adjusted maximum level when the footpedal transitions to said third position, the adjusted maximum level is less than the first maximum vacuum level and greater than the new maximum vacuum level.
6. The method of claim 1 , further comprising resetting the new maximum vacuum level to the first maximum vacuum level when the footpedal transitions back from the second position to the first position.
7. The method of claim 1 , wherein the footpedal further defines a yaw position and further comprising resetting the new maximum vacuum level to the first maximum vacuum level when the footpedal transitions to said yaw position.
8. The method of claim 1 , wherein the aspiration source is a vacuum-based pump or a combination of a vacuum-based pump and a flow-based pump.
9. The method of claim 1 , wherein the aspiration source is a combination of a vacuum-based pump and a flow-based pump, the footpedal further defines a third position, and further comprising transitioning between the vacuum-based pump and flow-based pump when the footpedal transitions to said third position, the transition maintaining a stable vacuum level.