Pulse manipulation for controlling a phacoemulsification surgical system

• US 20070056596A1
• Filed: 08/31/2005
• Published: 03/15/2007
• Est. Priority Date: 08/31/2005
• Status: Abandoned Application

• Current Assignee: Novartis Ag
• Original Assignee: Alcon Incorporated
• Inventors: Dacquay, Bruno, Boukhny, Mikhail, Fanney, Douglas
• Application Number:
  US11/216,475
• Publication Number:
  US 20070056596A1
• Time in Patent Office: Days
• US Class Current: 128/898
• CPC Class Codes: A61B 2017/00159 Pulse shapes
• CPC Class Codes: A61B 2017/00172 Pulse trains, bursts, intermittent continuous operation
• CPC Class Codes: A61B 2017/00176 Two pulses, e.g. second pulse having an effect different from the first one
• CPC Class Codes: A61B 2017/00181 Means for setting or varying the pulse energy
• CPC Class Codes: A61B 2017/00977 the depression depth determining the power rate
• CPC Class Codes: A61F 9/00745 using mechanical vibrations, e.g. ultrasonic
• CPC Class Codes: B06B 1/0215 for generating pulses, e.g. bursts of oscillations, envelopes

Abstract

Methods of manipulating pulses of ultrasonic energy for use with an ophthalmic surgical device.

Claims

1. A method generating energy for use with an ophthalmic surgical device, the method comprising:

programming a linear rise component;

programming a linear decay component; and

generating a pulse having multiple segments, wherein

a first segment includes the linear rise component that increases from a first amplitude to a second amplitude,

a second segment begins at the end of the first segment and is at the second amplitude, and

a third segment includes the linear decay component that decreases from the second amplitude to a third amplitude, and

the linear rise and decay components being programmed separately from is a natural rise and a natural decay caused by activating and deactivating a power element that generates the pulses.

2. The method of claim 1, wherein the linear rise component increases slower than a natural rise when the power element is activated.

3. The method of claim 1, wherein the linear decay component decays slower than a natural decay when the power element is de-activated.

4. The method of claim 1, wherein the first amplitude is zero.

5. The method of claim 1, wherein the first amplitude is non-zero.

6. The method of claim 1, wherein the linear rise component increases at a rate that is about the same as the rate at which the linear decay component decreases.

7. The method of claim 1, wherein the linear rise component increases faster than the linear decay component decreases.

8. The method of claim 1, wherein the second stage is at a substantially constant amplitude.

9. The method of claim 1, wherein the third amplitude is about the same as the first amplitude.

10. The method of claim 1, wherein the third amplitude is greater than the first amplitude.

13. The method of claim 1, wherein the third amplitude is greater than the first amplitude.

15. The method of claim 1, wherein the first amplitude is non-zero.

16. The method of claim 1, wherein the second amplitude being substantially constant.

11. A method of generating energy for use with an ophthalmic surgical device, the method comprising:

generating a plurality of pulses, each pulse having

a first pulse segment that increases linearly from a first amplitude to a second amplitude in about 5-500 milliseconds,

a second pulse segment at the second amplitude for a pre-determined amount of time, and

a third pulse segment that decreases linearly between the second amplitude and the third amplitude in about 5-500 milliseconds,

wherein the rates at which the first and third pulse segments respectively rise and decay are programmed separately from a natural rise and a natural decay caused by activating and deactivating a power element that generates the pulses.

12. The method of claim 11, wherein the third amplitude is about the same as the first amplitude.

14. The method of claim 11, wherein the first amplitude is zero.

17. A method of generating energy for use in an ophthalmic surgical device, the method comprising:

generating a plurality of pulses, each pulse having

a first rectangular pulse segment at a first amplitude for a pre-determined amount of time, and

a second rectangular pulse segment at a second amplitude for a pre-determined amount of time, wherein a beginning of the second rectangular pulse segment follows an end of the first rectangular pulse segment, and the second amplitude is greater than the first amplitude.

18. The method of claim 17, wherein the first and second rectangular pulse segments are about the same duration.

19. The method of claim 17, further comprising increasing the amplitudes of the first and second rectangular pulse segments in response to a controller.

20. The method of claim 19, wherein the controller is a foot pedal, further comprising increasing the amplitudes of the first and second rectangular pulse segments in response to movement of the foot pedal.

21. The method of claim 17, wherein each pulse includes a third rectangular pulse segment, and wherein the amplitude of the third rectangular pulse segment is greater than the second amplitude.