Blood culture sensor station utilizing two distinct light source

Details Blood culture sensor station utilizing two distinct light source Blood culture sensor station utilizing two distinct light source

1993-07-21

1995-06-06

Rosenberger, Richard A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 39, 356341, G01N 2115, G01N 3348

Patent

active

054227208

ABSTRACT:
A method for determining whether a particular sample vial has bacterial growth includes the steps of introducing a first light into the sample vial and measuring the intensity of the reemerging light. One then introduces a second light which is different from the first light and has either a different wavelength, or is introduced at a different location than the first light. The reemerging intensity from the second light is also measured. A ratio quantity is calculated based on the two reemerging intensities, and the calculated ratio is compared to expected ratios for both positive and negative samples. It has been found that a comparison of the reemerging light intensities provides a very good indication of whether a particular sample is a positive or negative sample. Various methods and formulas for calculating the ratios may be utilized. Graphs associated with the particular methods and formulas are developed experimentally to allow one to compare a particular calculated ratio value to expected values for positive and negative cultures.

REFERENCES:
patent: 3910701 (1975-10-01), Henderson et al.
patent: 5059394 (1991-10-01), Phillips et al.
patent: 5164796 (1992-11-01), DiGuiseppi et al.
patent: 5293210 (1994-03-01), Berndt

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