Method of treating veins

• US 5,522,813 A
• Filed: 09/23/1994
• Issued: 06/04/1996
• Est. Priority Date: 09/23/1994
• Status: Expired due to Fees

• Current Assignee: ESC Medical Systems, Inc.
• Original Assignee: Coherent Inc (Coherent Corp.)
• Inventors: Trelles, Mario A.
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): HARRIS, SONYA C
• Application Number:
  US08/310,869
• Time in Patent Office: 620 Days
• Field of Search: 606/9, 606/2, 606/10, 606/11, 606/12, 606/19, 606/187, 607/88, 607/89
• US Class Current: 606/2
• CPC Class Codes: A61B 18/201 with beam delivery through a hollow tube, e.g. forming an articulated arm through a flexible conduit A61B18/22; Hand-pieces therefor
• CPC Class Codes: A61B 18/203 applying laser energy to the outside of the body
• CPC Class Codes: A61B 2017/00747 Dermatology
• CPC Class Codes: A61B 2018/00452 Skin
• CPC Class Codes: A61B 2090/036 abutting on tissue or skin

Abstract

A method of treating vascular lesions is disclosed which includes using a focused beam from a high energy, carbon dioxide laser to irradiate a spot on the surface of the skin over the vessel to be treated. The carbon dioxide output wavelength is highly absorbed by the tissue. By using short, high energy pulses, a small volume of skin can be vaporized or ablated with each pulse with little thermal damage beyond the ablated region. Using multiple pulses, a small channel is drilled in the skin until the vessel is reached. The laser energy absorbed by the blood in the vessel will cause it to coagulate and collapse. This procedure is then repeated at multiple sites along the length of the vessel so that it will collapse and no longer carry any blood.

Claims

1. A method of treating an elongated blood vessel located in the tissue under the surface of the skin comprising the steps of:

irradiating a spot on the surface of the skin with laser light having a diameter less than 0.2 mm and a fluence and power sufficient to ablate a hole in the tissue having a depth which reaches the vessel causing the vessel to bleed and coagulate; and

repeating the irradiating step at multiple spots on the skin along the length of the vessel to be treated.

2. A method as recited in claim 1 wherein the step of irradiating is performed with a far infrared laser radiation.

3. A method as recited in claim 1 wherein said step of irradiating is performed with laser from a carbon dioxide laser.

4. A method as recited in claim 3 wherein said each spot is irradiated with pulses of laser light, wherein each pulse has a duration less than one millisecond.

5. A method as recited in claim 4 wherein each pulse has an energy between 100 and 500 millijoules.

6. A method as recited in claim 1 wherein the spot on the surface of the skin has a diameter of 0.1 mm.

7. A method as recited in claim 1 wherein the spots are spaced apart by about 1 to 5 cm.