The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 26, 2002
Filed:
Aug. 31, 2000
Joseph P. Culver, Philadelphia, PA (US);
Arjun G. Yodh, Merion, PA (US);
Trustees of The University of Pennsylvania, Philadelphia, PA (US);
Abstract
Extravasation of a fluid applied to a patient is determined by monitoring light transmitted through the tissue of the patient in proximity to a site at which the fluid is being injected. Light is radiated from a plurality of light sources in an encoded manner into the body part at the site at which the fluid is injected and the light that is reflected, scattered, diffused or otherwise emitted from the body part is detected individually by a plurality of light detectors. Signals representative of the detected light are developed and, prior to injection of the fluid, references are developed against which measurements made during injection of the fluid are compared. New light signals having an improved signal-to-noise ratio are developed from the comparisons of the detected light signals with the associated reference signals. Prior to injection of the fluid into the body part, a model, dependent on the arrangement of the light sources and the light detectors on the support pad is developed for calculating extravasation volume from the new light signals having an is improved signal-to-noise ratio. The new light signals having an improved signal-to-noise ratio are combined according to the model to determine the volume of extravasation and the volume of extravasation is compared with a prescribed level of extravasation.