Catheter for laser angiosurgery

United States Patent m

KittreU et al.

[ii] Patent Number: 4,913,142 [45] Date of Patent: Apr. 3, 1990

[54] CATHETER FOR LASER ANGIOSURGERY

[75] Inventors: Carter Kittrell, Cambridge, Mass.;

Robert M. Cothren, Jr., Beatrice,
Nebr.; Michael S. Feld, Waban,
Mass.

[73] Assignee: Massachusetts Institute of

Technology, Cambridge, Mass.

[21] Appl. No.: 58,675

[22] Filed: May 26, 1987

Related U.S. Application Data

[63] Continuation of Ser. No. 615,239, Mar. 22, 1985, abandoned.

[51] Int.CL* A61B 17/36

[52] U.S. a 606/7; 606/15;

606/16

[58] Field of Search 128/4-8,

128/303.1, 395-398, 657; 219/12 LL, 12 LQ, 12 LR; 350/96.26

[56] References Cited"

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(List continued on next page.)

Primary Examiner—Max Hindenburg

Attorney, Agent, or Firm—Hamilton,'Brook, Smith &

Reynolds

[57] ABSTRACT

A laser catheter is disclosed wherein optical fibers carrying laser light are mounted in a catheter for insertion into an artery to provide controlled delivery of a laser beam for percutaneous intravascular laser treatment of atherosclerotic disease. A transparent protective shield is provided at the distal end of the catheter for mechanically displacing intravascular blood and protecting the fibers from the intravascular contents, as well as protecting the patient in the event of failure of the fiber optics. Multiple optical fibers allow the selection of tissue that is to be removed. A computer controlled system automatically aligns fibers with the laser and controls exposure time. Spectroscopic diagnostics determine what tissue is to be removed.

21 Claims, 22 Drawing Sheets

U.S. PATENT DOCUMENTS

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Description of a New Technique", Ginsburg, et al.,

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"The Artery Zapper", Denise Grady, Discover, Dec,

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