Laser surgical cutting probe and system

• US 6,213,998 B1
• Filed: 04/02/1998
• Issued: 04/10/2001
• Est. Priority Date: 04/02/1998
• Status: Expired due to Term

• Current Assignee: Vanderbilt University
• Original Assignee: Vanderbilt University
• Inventors: Shen, Jin Hui, Joos, Karen M.
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): YARNELL, BRYAN KEITH
• Application Number:
  US09/054,039
• Time in Patent Office: 1,104 Days
• Field of Search: 372/69-72, 372/34, 372/35.36, 372/39, 606/2-4, 606/10, 606/11, 606/13, 606/15-17, 607/88, 607/89, 607/93
• US Class Current: 606/10
• CPC Class Codes: A61F 2009/00874 Vitreous
• CPC Class Codes: A61F 2009/00887 Cataract
• CPC Class Codes: A61F 2009/00889 Capsulotomy
• CPC Class Codes: A61F 9/00814 Laser features or special beam parameters therefor

Abstract

A surgical laser system combines a laser diode array remotely connected to a hand-held surgical probe by a fiber bundle. The surgical system has a which includes a laser head which produces a laser beam for surgical tissue ablation that is delivered through a disposable intraocular probe tip. The probe tip is made of a short section of optical fiber. Preferably, the laser head is an Er:YAG rod pumped by energy from the laser diode array to operate at a wavelength of 2.94 microns. Auxiliary water and thermal electric cooling integral to the hand piece cools the laser head.

Claims

1. A system for performing laser surgery comprising:

a. a laser energy source remotely connected to a surgical probe assembly by a remote connect assembly, the remote connect assembly including a fiber bundle adapted to transmit laser pump energy from the laser energy source;

b. the surgical probe assembly comprising a hand piece having a size and shape adapted for gripping, a chamber internal to the hand piece, the chamber enclosing a laser head, and a probe tip, the chamber being sealed against entry of moisture and dust; and

c. the laser head operatively coupled to the fiber bundle to receive the laser pump energy whereby the laser pump energy causes the laser head to generate a beam of laser radiation at a predetermined wavelength and energy level, the beam of laser radiation optically coupled to and directed through the probe tip, the fiber bundle having an output end that is closely proximate to or in contact with an external coupling surface portion of the laser head, the output end of the fiber bundle covering substantially all of the coupling surface portion of the laser head.

2. The system of claim 1 wherein the probe tip comprises a piece of optical fiber removably attached to the hand piece whereby the probe tip can be separated from the hand piece and laser head to be disposed of and replaced after use.

3. The system of claim 1 further comprising a suction/infusion line adapted for delivering and removing fluids proximate the probe tip.

4. The system of claim 1 wherein the fiber bundle comprises a plurality of bundled silica fibers.

5. The system of claim 1 whereby the laser energy source comprises a diode laser array generating the laser pump energy at a wavelength of 970 nm and the laser head comprises an Er:

YAG rod whereby the beam of laser radiation has a wavelength of 2.94 microns.

6. The system of claim 5, the laser energy source further comprising a column lens and a focusing lens aligned in an optical path between the laser diode array and the fiber bundle.

7. The system of claim 5 wherein the fiber bundle is side coupled to the Er:

YAG rod.

8. The system of claim 5 wherein the fiber bundle is end coupled to the Er:

YAG rod.

9. The system of claim 5, the surgical probe assembly further comprising means to deliver a visible guide beam indicating the position of the beam of laser radiation.

10. The system of claim 1 wherein the surgical probe assembly further comprises auxiliary cooling means integral to the hand piece.

11. The system of claim 10, the auxiliary cooling means comprising a thermal electric cooler proximate the laser head.

12. The system of claim 10, the auxiliary cooling means comprising a recirculating fluid channel.

13. The system of claim 1 wherein the laser head comprises a crystal rod having flat end portions forming an oscillator cavity.