Vacuum level control of power for phacoemulsification hand piece
View Patent ↗The present invention comprises a method of operating an ophthalmic surgical hand piece, providing a series of power pulses to the hand piece, each of the series of power pulses having a first portion that produces torsional movement of a cutting tip and a second portion that produces longitudinal movement of the cutting tip; measuring vacuum pressure; altering the duration of the first portion as vacuum pressure increases; and altering the duration of the second portion as vacuum pressure increases.
1. A method of operating an ophthalmic surgical hand piece, the method comprising:
providing a series of power pulses to the hand piece, each of the series of power pulses having a first portion that produces torsional movement of a cutting tip and a second portion that produces longitudinal movement of the cutting tip;
measuring vacuum pressure;
decreasing the duration of the first portion as vacuum pressure increases; and
increasing the duration of the second portion as vacuum pressure increases.
2. The method of claim 1 further comprising:
increasing the amplitude of the second portion as vacuum pressure increases.
3. The method of claim 1 further comprising:
decreasing the amplitude of the first portion as vacuum pressure increases.
4. A method of operating an ophthalmic surgical hand piece, the method comprising:
providing a series of power pulses to the hand piece, each of the series of power pulses having a first portion that produces torsional movement of a cutting tip and a second portion that produces simultaneous torsional and longitudinal movement of the cutting tip;
measuring vacuum pressure;
decreasing the duration of the first portion as vacuum pressure increases; and
increasing the duration of the second portion as vacuum pressure increases.
5. The method of claim 4 further comprising:
increasing the amplitude of the second portion as vacuum pressure increases.
6. The method of claim 4 further comprising:
decreasing the amplitude of the first portion as vacuum pressure increases.
7. A method of operating an ophthalmic surgical hand piece, the method comprising:
providing a series of power pulses to the hand piece, each of the series of power pulses having a first portion that produces torsional movement of a cutting tip, a second portion that produces simultaneous torsional and longitudinal movement of the cutting tip, and a third portion that produces longitudinal movement of the cutting tip;
measuring vacuum pressure;
altering the duration of the first portion as vacuum pressure increases;
decreasing the duration of the second portion as vacuum pressure increases; and
increasing the duration of the third portion as vacuum pressure increases.
8. The method of claim 7 further comprising:
increasing the amplitude of the second portion as vacuum pressure increases.
9. The method of claim 7 further comprising:
increasing the amplitude of the third portion as vacuum pressure increases.
10. The method of claim 7 wherein altering the duration of the second portion as vacuum pressure increases further comprises increasing the duration of the second portion as vacuum pressure increases.