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Proceedings Paper

Rapid optical heating of blood for clinical point-of-care diagnostics
Author(s): Brian E. Catanzaro; Ted Hill; Steve Hankins; Kent Gandola
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Paper Abstract

Clinical testing of human blood requires adherence to a number of regulatory standards, including maintaining a temperature that is representative of the human body (e.g. 37 C). The economics of private and public healthcare drives blood assays to be conducted using low cost, disposable assay devices that also eliminate the possibility of cross contamination. Unfortunately, the materials that meet the economic and disposable constraints of the marketplace are thermal insulators, not ideal for rapid heating. We present a novel means of optically heating blood samples in plastic assay devices within a time period suitable for point-of-care use. The novel approach uses LED's in the red portion of the visible spectrum. The lower absorption of optical radiation in the visible spectrum enables the absorption of energy deep into the assay device. This produces even heating, avoiding the gradients that can occur by surface heating (conduction) or surface absorption (highly absorbing wavelengths). Analytical and computational models will be discussed. A specific application to a point-of-care blood assay instrument will be reviewed. In this application, optical heating was achieved using a small array of high brightness LED's. Experimental results will be discussed. The experimental results with this instrument validated the predictions.

Paper Details

Date Published: 19 February 2010
PDF: 10 pages
Proc. SPIE 7555, Advanced Biomedical and Clinical Diagnostic Systems VIII, 75550S (19 February 2010); doi: 10.1117/12.842881
Show Author Affiliations
Brian E. Catanzaro, CFE Services (United States)
Ted Hill, Hill Engineering (United States)
Steve Hankins, Accumetrics (United States)
Kent Gandola, Accumetrics (United States)

Published in SPIE Proceedings Vol. 7555:
Advanced Biomedical and Clinical Diagnostic Systems VIII
Tuan Vo-Dinh; Warren S. Grundfest M.D.; Anita Mahadevan-Jansen, Editor(s)

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