Ultrasonic mechanical emulsifier

• US 7,876,025 B2
• Filed: 09/07/2006
• Issued: 01/25/2011
• Est. Priority Date: 09/26/2005
• Status: Active Grant

• Current Assignee: Tan Tock Seng Hospital Pte Limited (MOH Holdings Pte Limited), Nanyang Technological University
• Original Assignee: Tan Tock Seng Hospital Pte Limited (MOH Holdings Pte Limited), Nanyang Technological University
• Inventors: Lim, Tock Han, Boey, Freddy Y. C., Ma, Jan
• Primary Examiner(s): BUDD, MARK OSBORNE
• Application Number:
  US12/088,221
• Publication Number:
  US 20080315720A1
• Time in Patent Office: 1,601 Days
• Field of Search: 310/328, 310/366
• US Class Current: 310/328
• CPC Class Codes: A61F 9/00745 using mechanical vibrations, e.g. ultrasonic

Abstract

A tubular piezoelectric transducer comprising a tube of piezoelectric material and having a plurality of external electrodes for inducing in a first end of the tube at least one movement of a plurality of possible movements; at least two spokes attached to and extending radially inwardly of the tube for movement with the first end; a hub at an inner end of the at least two spokes and being located on the longitudinal axis of the tube, the hub being attached to the at least two spokes for movement therewith; the hub being for receiving therein a probe for movement of the probe with the hub. A phaco-probe incorporating the transducer is also disclosed.

Claims

1. A phaco-probe comprising a tubular piezoelectric transducer including a tube of piezoelectric material and having a plurality of external electrodes for inducing in a first end of the tube at least one movement of a plurality of possible movements;

a hub having its centre located on the longitudinal axis of the tube, the hub being for movement with the first end;

the hub being for receiving therein a probe for movement of the probe with the hub;

wherein movement of the probe comprises controllable localized mechanical vibrations for disintegrating a lens in an eye; and

wherein there are at least two spokes attached to and extending radially inwardly of the tube for movement with the first end, the hub being at an inner end of the at least two spokes.

2. A phaco-probe as claimed in claim 1, wherein the plurality of external electrodes extend longitudinally of the tube.

3. A phaco-probe as claimed in claim 1, wherein the plurality of external electrodes are on an external surface of the tube.

4. A phaco-probe as claimed in claim 1, wherein the plurality of external electrodes comprise four electrodes arranged as equal quadrants extending longitudinally of the tube.

5. A phaco-probe as claimed in claim 1, wherein the at least two spokes are at a location selected from the group consisting of:

at the first end, and adjacent the first end.

6. A phaco-probe as claimed in claim 1, wherein the hub is of a form selected from the group consisting of:

integral with the spokes, formed by the spokes, securely attached to the spokes, formed by the tube, and integral with the tube.

7. A phaco-probe as claimed in claim 1, wherein the at least two spokes and the hub are relatively rigid so all motion of the first end is transmitted to the probe through the at least two spokes and hub.

8. A phaco-probe as claimed in claim 1, wherein the probe is attachable to the hub by one selected from the group consisting of:

a friction fit, a snap fit, a bayonet fitting, and a screw-thread connection.

9. A phaco-probe as claimed in claim 1, wherein the plurality of possible movements are selected from the group consisting of:

reciprocating motion of the first end in the direction of the longitudinal axial of the tube, rotational motion of the first end about the longitudinal axis of the tube;

vertical oscillation of the first end, horizontal oscillation of the first end; and

arcuate oscillation of the first end about the longitudinal axis of the tube.

10. A phaco-probe as claimed in claim 1, wherein the probe extends axially outwardly from the first end and has at its outer end a probe tip.

11. A phaco-probe as claimed in claim 10, wherein the probe is located within a funnel-shaped housing, the probe tip extending beyond the funnel-shaped housing.

12. A phaco-probe as claimed in claim 11, wherein the funnel-shaped housing and the head end conduct the ultrasonic vibrations to the probe tip for radiating the ultrasonic vibrations from a phaco-probe tip.

13. A phaco-probe as claimed in claim 1 further comprising a stack of piezoelectric actuators capable of reciprocal movement in the direction of the longitudinal axis of the tubular piezoelectric transducer.

14. A phaco-probe as claimed in claim 13, wherein the stack of piezoelectric actuators and the tubular piezoelectric transducer are able to be operated independently of each other.

15. A phaco-probe as claimed in claim 12, wherein the phaco-probe tip comprises a tip of the funnel-shaped housing, and the probe tip.

16. A phaco-probe as claimed in claim 1, wherein the probe is hollow for extraction of the disintegrated lens from the eye by connection of one end of the probe to a vacuum suction pump.