Vacuum level control of power for phacoemulsification hand piece

• US 8,414,605 B2
• Filed: 07/08/2011
• Issued: 04/09/2013
• Est. Priority Date: 07/08/2011
• Status: Active Grant

• Current Assignee: Alcon Incorporated
• Original Assignee: Alcon Research Limited (Nestle SA)
• Inventors: Gordon, Raphael, Salehi, Ahmad, Teodorescu, Dan
• Primary Examiner(s): Severson, Ryan
• Assistant Examiner(s): Miles, Jonathan W
• Application Number:
  US13/178,845
• Publication Number:
  US 20130012868A1
• Time in Patent Office: 641 Days
• Field of Search: 606/107, 606/166, 606/167, 606/169, 606/170, 606/171, 606/180, 604/22
• US Class Current: 606/169
• CPC Class Codes: A61F 9/00745 using mechanical vibrations, e.g. ultrasonic

Abstract

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.

Claims

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.