Instrument and method for phacoemulsification by direct thermal irradiation

• US 6,527,766 B1
• Filed: 04/27/2000
• Issued: 03/04/2003
• Est. Priority Date: 04/28/1999
• Status: Expired due to Fees

• Current Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Original Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Inventors: Bair, Scott
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): LESLIE, MICHAEL S
• Application Number:
  US09/560,020
• Time in Patent Office: 1,041 Days
• Field of Search: 606/27, 606/28, 606/29, 606/41, 606/48, 606/49, 606/50, 604/35
• US Class Current: 606/28
• CPC Class Codes: A61B 18/082 Probes or electrodes therefor
• CPC Class Codes: A61B 2018/1407 Loop
• CPC Class Codes: A61F 9/00736 Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments A61F9/008 takes precedence

Abstract

A phacoemulsification and aspiration device comprising: (a) a substantially hollow housing comprising a first end and a second end; (b) an electrical resistance heating element disposed at the first end of the housing and configured to thermally irradiate a space proximal to the first end and exterior to the housing; (c) a source of electricity in electrical contact with the heating element; and (d) a vacuum source disposed at and integrally connected to the second end of the housing; and a method for treating cataracts in vivo by liquefying a cataractous lens nucleus and aspirating the same from within a surrounding lens capsule comprising the steps of: (a) thermally irradiating and liquefying a lens; and (b) aspirating the lens.

Claims

1. A phacoemulsification and aspiration device comprising:

a) a substantially hollow housing comprising a first end and a second end;

b) an electrical resistance heating element disposed at the first end of the housing and configured to thermally irradiate a space proximal to the first end and exterior to the housing;

c) a source of electricity in electrical contact with the heating element; and

d) a vacuum source disposed at and integrally connected to the second end of the housing.

2. The device of claim 1 wherein the electrical resistance heating element comprises a coil of wire that is axially and proximally displaced from the first end of the housing.

3. The device of claim 1 wherein the electrical resistance heating element is configured in relation to the housing to directly contact a lens when the first end of the housing is brought into contact with the lens.

4. The device of claim 1 wherein the source of electricity comprises an electrically conductive wire that traverses the length of the housing.

5. The device of claim 1 wherein the source of electricity and electrical resistance heating element form an electrical circuit which comprises:

a) a source of DC or AC electricity comprising first and second terminals;

b) a first set of one or more wires which are integrated electrically, and which are in electrical contact with the first terminal and a first end of the heating element; and

c) a second set of one or more wires which are integrated electrically, and which are in electrical contact with a second end of the heating element and the second terminal.

6. The device of claim 1 wherein the source of electricity and electrical resistance heating element form an electrical circuit which comprises:

a) a source of DC or AC electricity comprising first and second terminals;

b) a first electrically insulated wire which is in electrical contact with the first terminal of the source of DC or AC electricity, and which traverses the housing and makes electrical contact with a first end of the heating element;

c) an electrical contact between a second end of the heating element and the housing; and

d) a second electrically insulated wire that contacts the housing and the source of DC or AC electricity.

7. The device of claim 1 further comprising a vacuum regulator.

8. The device of claim 1 further comprising an electricity regulator.

9. A method for treating cataracts in vivo by liquefying a cataractous lens nucleus and aspirating the same from within a surrounding lens capsule comprising the steps of:

a) thermally irradiating and liquefying a lens by;

i) providing a hollow housing comprising a first end and a second end;

ii) contacting an electrically resistive element disposed at the first end of the hollow housing with the lens; and

iii) creating an electrical potential across the element; and

b) aspirating the lens.

10. The method of claim 9 further comprising supplying a vacuum to a second end of the hollow housing and thereby aspirating the lens nucleus.

11. The method of claim 9 wherein a vacuum is supplied to the second end of the hollow housing continuously during the thermal irradiation of the lens.

12. The method of claim 9 further comprising measuring the voltage drop and current across the electrically resistive element;

and converting the voltage drop and current to a temperature for the heating element.

13. The method of claim 12, further comprising modulating the electrical potential across the electrically resistive element in response to the temperature of the electrically resistive element.

14. The method of claim 12, further comprising displaying the temperature of the electrically resistive element.