Method and apparatus for tissue oximetry

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US007356365B2

United States Patent

Schurman

(io) Patent No.: (45) Date of Patent:

US 7,356,365 B2 Apr. 8, 2008

METHOD AND APPARATUS FOR TISSUE
OXIMETRY

Inventor: Matthew J. Schurman, Somerset, NJ
(US)

Assignee: GlucoLight Corporation, Bethlehem, PA (US)

Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 180 days.

Appl. No.: 10/884,298

Filed: Jul. 2, 2004

Prior Publication Data

US 2005/0059868 Al Mar. 17, 2005

Related U.S. Application Data

Provisional application No. 60/485,761, filed on Jul. 9, 2003.

Int. CI.

A61B 5/1455 (2006.01)

U.S. CI 600/323

Field of Classification Search 600/323,

600/328, 334,310, 322 See application file for complete search history.

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In accordance with the invention, the oxygenation of bloodprofused tissue is measured by shining light into the profused tissue and analyzing the light reflected within the tissue. The light is reflected by cell walls in the tissue and is partially absorbed by hemoglobin in the blood. Since the extent of absorption is sensitive to the extent of hemoglobin oxygenation, measurement and processing of the reflected light provides a measure of the oxygenation of the blood. In one embodiment, the method is applied to measure the oxygenation of blood within the tympanic membrane (ear drum).

12 Claims, 4 Drawing Sheets

U.S. PATENT DOCUMENTS

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